1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
55 #include "pointer-set.h"
57 extern cpp_reader *parse_in;
59 /* This structure contains information about the initializations
60 and/or destructions required for a particular priority level. */
61 typedef struct priority_info_s {
62 /* Nonzero if there have been any initializations at this priority
63 throughout the translation unit. */
64 int initializations_p;
65 /* Nonzero if there have been any destructions at this priority
66 throughout the translation unit. */
70 static void mark_vtable_entries (tree);
71 static bool maybe_emit_vtables (tree);
72 static bool acceptable_java_type (tree);
73 static tree start_objects (int, int);
74 static void finish_objects (int, int, tree);
75 static tree start_static_storage_duration_function (unsigned);
76 static void finish_static_storage_duration_function (tree);
77 static priority_info get_priority_info (int);
78 static void do_static_initialization_or_destruction (tree, bool);
79 static void one_static_initialization_or_destruction (tree, tree, bool);
80 static void generate_ctor_or_dtor_function (bool, int, location_t *);
81 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
83 static tree prune_vars_needing_no_initialization (tree *);
84 static void write_out_vars (tree);
85 static void import_export_class (tree);
86 static tree get_guard_bits (tree);
87 static void determine_visibility_from_class (tree, tree);
88 static bool decl_defined_p (tree);
90 /* A list of static class variables. This is needed, because a
91 static class variable can be declared inside the class without
92 an initializer, and then initialized, statically, outside the class. */
93 static GTY(()) VEC(tree,gc) *pending_statics;
95 /* A list of functions which were declared inline, but which we
96 may need to emit outline anyway. */
97 static GTY(()) VEC(tree,gc) *deferred_fns;
99 /* A list of decls that use types with no linkage, which we need to make
101 static GTY(()) VEC(tree,gc) *no_linkage_decls;
103 /* Nonzero if we're done parsing and into end-of-file activities. */
109 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
110 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
111 that apply to the function). */
114 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
120 if (fntype == error_mark_node || ctype == error_mark_node)
121 return error_mark_node;
123 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
124 || TREE_CODE (fntype) == METHOD_TYPE);
126 type_quals = quals & ~TYPE_QUAL_RESTRICT;
127 ctype = cp_build_qualified_type (ctype, type_quals);
128 raises = TYPE_RAISES_EXCEPTIONS (fntype);
129 attrs = TYPE_ATTRIBUTES (fntype);
130 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
131 (TREE_CODE (fntype) == METHOD_TYPE
132 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
133 : TYPE_ARG_TYPES (fntype)));
135 fntype = build_exception_variant (fntype, raises);
137 fntype = cp_build_type_attribute_variant (fntype, attrs);
142 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
143 return type changed to NEW_RET. */
146 change_return_type (tree new_ret, tree fntype)
149 tree args = TYPE_ARG_TYPES (fntype);
150 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
151 tree attrs = TYPE_ATTRIBUTES (fntype);
153 if (same_type_p (new_ret, TREE_TYPE (fntype)))
156 if (TREE_CODE (fntype) == FUNCTION_TYPE)
157 newtype = build_function_type (new_ret, args);
159 newtype = build_method_type_directly (TYPE_METHOD_BASETYPE (fntype),
160 new_ret, TREE_CHAIN (args));
162 newtype = build_exception_variant (newtype, raises);
164 newtype = cp_build_type_attribute_variant (newtype, attrs);
169 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
173 cp_build_parm_decl (tree name, tree type)
175 tree parm = build_decl (input_location,
176 PARM_DECL, name, type);
177 /* DECL_ARG_TYPE is only used by the back end and the back end never
179 if (!processing_template_decl)
180 DECL_ARG_TYPE (parm) = type_passed_as (type);
182 /* If the type is a pack expansion, then we have a function
184 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
185 FUNCTION_PARAMETER_PACK_P (parm) = 1;
190 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
194 build_artificial_parm (tree name, tree type)
196 tree parm = cp_build_parm_decl (name, type);
197 DECL_ARTIFICIAL (parm) = 1;
198 /* All our artificial parms are implicitly `const'; they cannot be
200 TREE_READONLY (parm) = 1;
204 /* Constructors for types with virtual baseclasses need an "in-charge" flag
205 saying whether this constructor is responsible for initialization of
206 virtual baseclasses or not. All destructors also need this "in-charge"
207 flag, which additionally determines whether or not the destructor should
208 free the memory for the object.
210 This function adds the "in-charge" flag to member function FN if
211 appropriate. It is called from grokclassfn and tsubst.
212 FN must be either a constructor or destructor.
214 The in-charge flag follows the 'this' parameter, and is followed by the
215 VTT parm (if any), then the user-written parms. */
218 maybe_retrofit_in_chrg (tree fn)
220 tree basetype, arg_types, parms, parm, fntype;
222 /* If we've already add the in-charge parameter don't do it again. */
223 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
226 /* When processing templates we can't know, in general, whether or
227 not we're going to have virtual baseclasses. */
228 if (processing_template_decl)
231 /* We don't need an in-charge parameter for constructors that don't
232 have virtual bases. */
233 if (DECL_CONSTRUCTOR_P (fn)
234 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
237 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
238 basetype = TREE_TYPE (TREE_VALUE (arg_types));
239 arg_types = TREE_CHAIN (arg_types);
241 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
243 /* If this is a subobject constructor or destructor, our caller will
244 pass us a pointer to our VTT. */
245 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
247 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
249 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
250 TREE_CHAIN (parm) = parms;
253 /* ...and then to TYPE_ARG_TYPES. */
254 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
256 DECL_HAS_VTT_PARM_P (fn) = 1;
259 /* Then add the in-charge parm (before the VTT parm). */
260 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
261 TREE_CHAIN (parm) = parms;
263 arg_types = hash_tree_chain (integer_type_node, arg_types);
265 /* Insert our new parameter(s) into the list. */
266 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
268 /* And rebuild the function type. */
269 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
271 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
272 fntype = build_exception_variant (fntype,
273 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
274 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
275 fntype = (cp_build_type_attribute_variant
276 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
277 TREE_TYPE (fn) = fntype;
279 /* Now we've got the in-charge parameter. */
280 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
283 /* Classes overload their constituent function names automatically.
284 When a function name is declared in a record structure,
285 its name is changed to it overloaded name. Since names for
286 constructors and destructors can conflict, we place a leading
289 CNAME is the name of the class we are grokking for.
291 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
293 FLAGS contains bits saying what's special about today's
294 arguments. DTOR_FLAG == DESTRUCTOR.
296 If FUNCTION is a destructor, then we must add the `auto-delete' field
297 as a second parameter. There is some hair associated with the fact
298 that we must "declare" this variable in the manner consistent with the
299 way the rest of the arguments were declared.
301 QUALS are the qualifiers for the this pointer. */
304 grokclassfn (tree ctype, tree function, enum overload_flags flags)
306 tree fn_name = DECL_NAME (function);
308 /* Even within an `extern "C"' block, members get C++ linkage. See
309 [dcl.link] for details. */
310 SET_DECL_LANGUAGE (function, lang_cplusplus);
312 if (fn_name == NULL_TREE)
314 error ("name missing for member function");
315 fn_name = get_identifier ("<anonymous>");
316 DECL_NAME (function) = fn_name;
319 DECL_CONTEXT (function) = ctype;
321 if (flags == DTOR_FLAG)
322 DECL_DESTRUCTOR_P (function) = 1;
324 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
325 maybe_retrofit_in_chrg (function);
328 /* Create an ARRAY_REF, checking for the user doing things backwards
332 grok_array_decl (tree array_expr, tree index_exp)
336 tree orig_array_expr = array_expr;
337 tree orig_index_exp = index_exp;
339 if (error_operand_p (array_expr) || error_operand_p (index_exp))
340 return error_mark_node;
342 if (processing_template_decl)
344 if (type_dependent_expression_p (array_expr)
345 || type_dependent_expression_p (index_exp))
346 return build_min_nt (ARRAY_REF, array_expr, index_exp,
347 NULL_TREE, NULL_TREE);
348 array_expr = build_non_dependent_expr (array_expr);
349 index_exp = build_non_dependent_expr (index_exp);
352 type = TREE_TYPE (array_expr);
354 type = non_reference (type);
356 /* If they have an `operator[]', use that. */
357 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
358 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
359 array_expr, index_exp, NULL_TREE,
360 /*overloaded_p=*/NULL, tf_warning_or_error);
365 /* Otherwise, create an ARRAY_REF for a pointer or array type.
366 It is a little-known fact that, if `a' is an array and `i' is
367 an int, you can write `i[a]', which means the same thing as
369 if (TREE_CODE (type) == ARRAY_TYPE)
372 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
374 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
377 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
379 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
381 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
384 if ((p1 && i2) && (i1 && p2))
385 error ("ambiguous conversion for array subscript");
388 array_expr = p1, index_exp = i2;
390 array_expr = p2, index_exp = i1;
393 error ("invalid types %<%T[%T]%> for array subscript",
394 type, TREE_TYPE (index_exp));
395 return error_mark_node;
398 if (array_expr == error_mark_node || index_exp == error_mark_node)
399 error ("ambiguous conversion for array subscript");
401 expr = build_array_ref (input_location, array_expr, index_exp);
403 if (processing_template_decl && expr != error_mark_node)
404 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
405 NULL_TREE, NULL_TREE);
409 /* Given the cast expression EXP, checking out its validity. Either return
410 an error_mark_node if there was an unavoidable error, return a cast to
411 void for trying to delete a pointer w/ the value 0, or return the
412 call to delete. If DOING_VEC is true, we handle things differently
413 for doing an array delete.
414 Implements ARM $5.3.4. This is called from the parser. */
417 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
421 if (exp == error_mark_node)
424 if (processing_template_decl)
426 t = build_min (DELETE_EXPR, void_type_node, exp, size);
427 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
428 DELETE_EXPR_USE_VEC (t) = doing_vec;
429 TREE_SIDE_EFFECTS (t) = 1;
433 /* An array can't have been allocated by new, so complain. */
434 if (TREE_CODE (exp) == VAR_DECL
435 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
436 warning (0, "deleting array %q#D", exp);
438 t = build_expr_type_conversion (WANT_POINTER, exp, true);
440 if (t == NULL_TREE || t == error_mark_node)
442 error ("type %q#T argument given to %<delete%>, expected pointer",
444 return error_mark_node;
447 type = TREE_TYPE (t);
449 /* As of Valley Forge, you can delete a pointer to const. */
451 /* You can't delete functions. */
452 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
454 error ("cannot delete a function. Only pointer-to-objects are "
455 "valid arguments to %<delete%>");
456 return error_mark_node;
459 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
460 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
462 warning (0, "deleting %qT is undefined", type);
466 /* Deleting a pointer with the value zero is valid and has no effect. */
467 if (integer_zerop (t))
468 return build1 (NOP_EXPR, void_type_node, t);
471 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
472 sfk_deleting_destructor,
475 return build_delete (type, t, sfk_deleting_destructor,
476 LOOKUP_NORMAL, use_global_delete);
479 /* Report an error if the indicated template declaration is not the
480 sort of thing that should be a member template. */
483 check_member_template (tree tmpl)
487 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
488 decl = DECL_TEMPLATE_RESULT (tmpl);
490 if (TREE_CODE (decl) == FUNCTION_DECL
491 || (TREE_CODE (decl) == TYPE_DECL
492 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
494 /* The parser rejects template declarations in local classes. */
495 gcc_assert (!current_function_decl);
496 /* The parser rejects any use of virtual in a function template. */
497 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
498 && DECL_VIRTUAL_P (decl)));
500 /* The debug-information generating code doesn't know what to do
501 with member templates. */
502 DECL_IGNORED_P (tmpl) = 1;
505 error ("template declaration of %q#D", decl);
508 /* Return true iff TYPE is a valid Java parameter or return type. */
511 acceptable_java_type (tree type)
513 if (type == error_mark_node)
516 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
518 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
520 type = TREE_TYPE (type);
521 if (TREE_CODE (type) == RECORD_TYPE)
524 if (! TYPE_FOR_JAVA (type))
526 if (! CLASSTYPE_TEMPLATE_INFO (type))
528 args = CLASSTYPE_TI_ARGS (type);
529 i = TREE_VEC_LENGTH (args);
532 type = TREE_VEC_ELT (args, i);
533 if (TREE_CODE (type) == POINTER_TYPE)
534 type = TREE_TYPE (type);
535 if (! TYPE_FOR_JAVA (type))
544 /* For a METHOD in a Java class CTYPE, return true if
545 the parameter and return types are valid Java types.
546 Otherwise, print appropriate error messages, and return false. */
549 check_java_method (tree method)
552 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
553 tree ret_type = TREE_TYPE (TREE_TYPE (method));
555 if (!acceptable_java_type (ret_type))
557 error ("Java method %qD has non-Java return type %qT",
562 arg_types = TREE_CHAIN (arg_types);
563 if (DECL_HAS_IN_CHARGE_PARM_P (method))
564 arg_types = TREE_CHAIN (arg_types);
565 if (DECL_HAS_VTT_PARM_P (method))
566 arg_types = TREE_CHAIN (arg_types);
568 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
570 tree type = TREE_VALUE (arg_types);
571 if (!acceptable_java_type (type))
573 if (type != error_mark_node)
574 error ("Java method %qD has non-Java parameter type %qT",
582 /* Sanity check: report error if this function FUNCTION is not
583 really a member of the class (CTYPE) it is supposed to belong to.
584 TEMPLATE_PARMS is used to specify the template parameters of a member
585 template passed as FUNCTION_DECL. If the member template is passed as a
586 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
587 from the declaration. If the function is not a function template, it
589 It returns the original declaration for the function, NULL_TREE if
590 no declaration was found, error_mark_node if an error was emitted. */
593 check_classfn (tree ctype, tree function, tree template_parms)
599 if (DECL_USE_TEMPLATE (function)
600 && !(TREE_CODE (function) == TEMPLATE_DECL
601 && DECL_TEMPLATE_SPECIALIZATION (function))
602 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
603 /* Since this is a specialization of a member template,
604 we're not going to find the declaration in the class.
607 struct S { template <typename T> void f(T); };
608 template <> void S::f(int);
610 we're not going to find `S::f(int)', but there's no
611 reason we should, either. We let our callers know we didn't
612 find the method, but we don't complain. */
615 /* Basic sanity check: for a template function, the template parameters
616 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
617 if (TREE_CODE (function) == TEMPLATE_DECL)
620 && !comp_template_parms (template_parms,
621 DECL_TEMPLATE_PARMS (function)))
623 error ("template parameter lists provided don't match the "
624 "template parameters of %qD", function);
625 return error_mark_node;
627 template_parms = DECL_TEMPLATE_PARMS (function);
630 /* OK, is this a definition of a member template? */
631 is_template = (template_parms != NULL_TREE);
633 /* We must enter the scope here, because conversion operators are
634 named by target type, and type equivalence relies on typenames
635 resolving within the scope of CTYPE. */
636 pushed_scope = push_scope (ctype);
637 ix = class_method_index_for_fn (complete_type (ctype), function);
640 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
641 tree fndecls, fndecl = 0;
643 const char *format = NULL;
645 for (fndecls = VEC_index (tree, methods, ix);
646 fndecls; fndecls = OVL_NEXT (fndecls))
650 fndecl = OVL_CURRENT (fndecls);
651 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
652 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
654 /* We cannot simply call decls_match because this doesn't
655 work for static member functions that are pretending to
656 be methods, and because the name may have been changed by
659 /* Get rid of the this parameter on functions that become
661 if (DECL_STATIC_FUNCTION_P (fndecl)
662 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
663 p1 = TREE_CHAIN (p1);
665 /* A member template definition only matches a member template
667 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
670 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
671 TREE_TYPE (TREE_TYPE (fndecl)))
672 && compparms (p1, p2)
674 || comp_template_parms (template_parms,
675 DECL_TEMPLATE_PARMS (fndecl)))
676 && (DECL_TEMPLATE_SPECIALIZATION (function)
677 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
678 && (!DECL_TEMPLATE_SPECIALIZATION (function)
679 || (DECL_TI_TEMPLATE (function)
680 == DECL_TI_TEMPLATE (fndecl))))
686 pop_scope (pushed_scope);
687 return OVL_CURRENT (fndecls);
690 error_at (DECL_SOURCE_LOCATION (function),
691 "prototype for %q#D does not match any in class %qT",
693 is_conv_op = DECL_CONV_FN_P (fndecl);
696 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
697 fndecls = VEC_index (tree, methods, ix);
700 fndecl = OVL_CURRENT (fndecls);
701 fndecls = OVL_NEXT (fndecls);
703 if (!fndecls && is_conv_op)
705 if (VEC_length (tree, methods) > (size_t) ++ix)
707 fndecls = VEC_index (tree, methods, ix);
708 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
720 format = N_("candidates are: %+#D");
722 format = N_("candidate is: %+#D");
723 error (format, fndecl);
726 else if (!COMPLETE_TYPE_P (ctype))
727 cxx_incomplete_type_error (function, ctype);
729 error ("no %q#D member function declared in class %qT",
733 pop_scope (pushed_scope);
734 return error_mark_node;
737 /* DECL is a function with vague linkage. Remember it so that at the
738 end of the translation unit we can decide whether or not to emit
742 note_vague_linkage_fn (tree decl)
744 DECL_DEFER_OUTPUT (decl) = 1;
745 VEC_safe_push (tree, gc, deferred_fns, decl);
748 /* We have just processed the DECL, which is a static data member.
749 The other parameters are as for cp_finish_decl. */
752 finish_static_data_member_decl (tree decl,
753 tree init, bool init_const_expr_p,
757 DECL_CONTEXT (decl) = current_class_type;
759 /* We cannot call pushdecl here, because that would fill in the
760 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
761 the right thing, namely, to put this decl out straight away. */
763 if (! processing_template_decl)
764 VEC_safe_push (tree, gc, pending_statics, decl);
766 if (LOCAL_CLASS_P (current_class_type))
767 permerror (input_location, "local class %q#T shall not have static data member %q#D",
768 current_class_type, decl);
770 /* Static consts need not be initialized in the class definition. */
771 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
773 static int explained = 0;
775 error ("initializer invalid for static member with constructor");
778 error ("(an out of class initialization is required)");
784 DECL_INITIAL (decl) = init;
785 DECL_IN_AGGR_P (decl) = 1;
787 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
790 /* DECLARATOR and DECLSPECS correspond to a class member. The other
791 parameters are as for cp_finish_decl. Return the DECL for the
792 class member declared. */
795 grokfield (const cp_declarator *declarator,
796 cp_decl_specifier_seq *declspecs,
797 tree init, bool init_const_expr_p,
802 const char *asmspec = 0;
803 int flags = LOOKUP_ONLYCONVERTING;
807 && TREE_CODE (init) == TREE_LIST
808 && TREE_VALUE (init) == error_mark_node
809 && TREE_CHAIN (init) == NULL_TREE)
812 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
813 if (! value || error_operand_p (value))
814 /* friend or constructor went bad. */
815 return error_mark_node;
817 if (TREE_CODE (value) == TYPE_DECL && init)
819 error ("typedef %qD is initialized (use decltype instead)", value);
823 /* Pass friendly classes back. */
824 if (value == void_type_node)
827 /* Pass friend decls back. */
828 if ((TREE_CODE (value) == FUNCTION_DECL
829 || TREE_CODE (value) == TEMPLATE_DECL)
830 && DECL_CONTEXT (value) != current_class_type)
833 name = DECL_NAME (value);
835 if (name != NULL_TREE)
837 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
839 error ("explicit template argument list not allowed");
840 return error_mark_node;
843 if (IDENTIFIER_POINTER (name)[0] == '_'
844 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
845 error ("member %qD conflicts with virtual function table field name",
849 /* Stash away type declarations. */
850 if (TREE_CODE (value) == TYPE_DECL)
852 DECL_NONLOCAL (value) = 1;
853 DECL_CONTEXT (value) = current_class_type;
855 if (processing_template_decl)
856 value = push_template_decl (value);
862 /* If this is a typedef that names the class for linkage purposes
863 (7.1.3p8), apply any attributes directly to the type. */
864 if (TAGGED_TYPE_P (TREE_TYPE (value))
865 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
866 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
868 cplus_decl_attributes (&value, attrlist, attrflags);
871 if (declspecs->specs[(int)ds_typedef]
872 && TREE_TYPE (value) != error_mark_node
873 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
874 cp_set_underlying_type (value);
879 if (DECL_IN_AGGR_P (value))
881 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
882 return void_type_node;
885 if (asmspec_tree && asmspec_tree != error_mark_node)
886 asmspec = TREE_STRING_POINTER (asmspec_tree);
890 if (TREE_CODE (value) == FUNCTION_DECL)
892 /* Initializers for functions are rejected early in the parser.
893 If we get here, it must be a pure specifier for a method. */
894 if (init == ridpointers[(int)RID_DELETE])
896 DECL_DELETED_FN (value) = 1;
897 DECL_DECLARED_INLINE_P (value) = 1;
898 DECL_INITIAL (value) = error_mark_node;
900 else if (init == ridpointers[(int)RID_DEFAULT])
902 if (defaultable_fn_check (value))
904 DECL_DEFAULTED_FN (value) = 1;
905 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
906 DECL_DECLARED_INLINE_P (value) = 1;
909 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
911 if (integer_zerop (init))
912 DECL_PURE_VIRTUAL_P (value) = 1;
913 else if (error_operand_p (init))
914 ; /* An error has already been reported. */
916 error ("invalid initializer for member function %qD",
921 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
922 error ("initializer specified for static member function %qD",
926 else if (pedantic && TREE_CODE (value) != VAR_DECL)
927 /* Already complained in grokdeclarator. */
929 else if (!processing_template_decl)
931 if (TREE_CODE (init) == CONSTRUCTOR)
932 init = digest_init (TREE_TYPE (value), init);
934 init = integral_constant_value (init);
936 if (init != error_mark_node && !TREE_CONSTANT (init))
938 /* We can allow references to things that are effectively
939 static, since references are initialized with the
941 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
942 || (TREE_STATIC (init) == 0
943 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
945 error ("field initializer is not constant");
946 init = error_mark_node;
952 if (processing_template_decl
953 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
955 value = push_template_decl (value);
956 if (error_operand_p (value))
957 return error_mark_node;
961 cplus_decl_attributes (&value, attrlist, 0);
963 switch (TREE_CODE (value))
966 finish_static_data_member_decl (value, init, init_const_expr_p,
967 asmspec_tree, flags);
972 error ("%<asm%> specifiers are not permitted on non-static data members");
973 if (DECL_INITIAL (value) == error_mark_node)
974 init = error_mark_node;
975 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
977 DECL_INITIAL (value) = init;
978 DECL_IN_AGGR_P (value) = 1;
983 set_user_assembler_name (value, asmspec);
985 cp_finish_decl (value,
987 /*init_const_expr_p=*/false,
988 asmspec_tree, flags);
990 /* Pass friends back this way. */
991 if (DECL_FRIEND_P (value))
992 return void_type_node;
994 DECL_IN_AGGR_P (value) = 1;
1003 /* Like `grokfield', but for bitfields.
1004 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1007 grokbitfield (const cp_declarator *declarator,
1008 cp_decl_specifier_seq *declspecs, tree width,
1011 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1013 if (value == error_mark_node)
1014 return NULL_TREE; /* friends went bad. */
1016 /* Pass friendly classes back. */
1017 if (TREE_CODE (value) == VOID_TYPE)
1018 return void_type_node;
1020 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
1021 && (POINTER_TYPE_P (value)
1022 || !dependent_type_p (TREE_TYPE (value))))
1024 error ("bit-field %qD with non-integral type", value);
1025 return error_mark_node;
1028 if (TREE_CODE (value) == TYPE_DECL)
1030 error ("cannot declare %qD to be a bit-field type", value);
1034 /* Usually, finish_struct_1 catches bitfields with invalid types.
1035 But, in the case of bitfields with function type, we confuse
1036 ourselves into thinking they are member functions, so we must
1038 if (TREE_CODE (value) == FUNCTION_DECL)
1040 error ("cannot declare bit-field %qD with function type",
1045 if (DECL_IN_AGGR_P (value))
1047 error ("%qD is already defined in the class %qT", value,
1048 DECL_CONTEXT (value));
1049 return void_type_node;
1052 if (TREE_STATIC (value))
1054 error ("static member %qD cannot be a bit-field", value);
1057 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1059 if (width != error_mark_node)
1061 constant_expression_warning (width);
1062 DECL_INITIAL (value) = width;
1063 SET_DECL_C_BIT_FIELD (value);
1066 DECL_IN_AGGR_P (value) = 1;
1069 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1075 /* Returns true iff ATTR is an attribute which needs to be applied at
1076 instantiation time rather than template definition time. */
1079 is_late_template_attribute (tree attr, tree decl)
1081 tree name = TREE_PURPOSE (attr);
1082 tree args = TREE_VALUE (attr);
1083 const struct attribute_spec *spec = lookup_attribute_spec (name);
1087 /* Unknown attribute. */
1090 /* Attribute weak handling wants to write out assembly right away. */
1091 if (is_attribute_p ("weak", name))
1094 /* If any of the arguments are dependent expressions, we can't evaluate
1095 the attribute until instantiation time. */
1096 for (arg = args; arg; arg = TREE_CHAIN (arg))
1098 tree t = TREE_VALUE (arg);
1100 /* If the first attribute argument is an identifier, only consider
1101 second and following arguments. Attributes like mode, format,
1102 cleanup and several target specific attributes aren't late
1103 just because they have an IDENTIFIER_NODE as first argument. */
1104 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1107 if (value_dependent_expression_p (t)
1108 || type_dependent_expression_p (t))
1112 if (TREE_CODE (decl) == TYPE_DECL
1114 || spec->type_required)
1116 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1118 /* We can't apply any attributes to a completely unknown type until
1119 instantiation time. */
1120 enum tree_code code = TREE_CODE (type);
1121 if (code == TEMPLATE_TYPE_PARM
1122 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1123 || code == TYPENAME_TYPE)
1125 /* Also defer most attributes on dependent types. This is not
1126 necessary in all cases, but is the better default. */
1127 else if (dependent_type_p (type)
1128 /* But attribute visibility specifically works on
1130 && !is_attribute_p ("visibility", name))
1139 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1140 applied at instantiation time and return them. If IS_DEPENDENT is true,
1141 the declaration itself is dependent, so all attributes should be applied
1142 at instantiation time. */
1145 splice_template_attributes (tree *attr_p, tree decl)
1148 tree late_attrs = NULL_TREE;
1149 tree *q = &late_attrs;
1156 if (is_late_template_attribute (*p, decl))
1158 ATTR_IS_DEPENDENT (*p) = 1;
1160 *p = TREE_CHAIN (*p);
1161 q = &TREE_CHAIN (*q);
1165 p = &TREE_CHAIN (*p);
1171 /* Remove any late attributes from the list in ATTR_P and attach them to
1175 save_template_attributes (tree *attr_p, tree *decl_p)
1177 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1179 tree old_attrs = NULL_TREE;
1184 if (DECL_P (*decl_p))
1185 q = &DECL_ATTRIBUTES (*decl_p);
1187 q = &TYPE_ATTRIBUTES (*decl_p);
1191 /* Place the late attributes at the beginning of the attribute
1193 TREE_CHAIN (tree_last (late_attrs)) = *q;
1196 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1198 /* We've added new attributes directly to the main variant, so
1199 now we need to update all of the other variants to include
1200 these new attributes. */
1202 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1203 variant = TYPE_NEXT_VARIANT (variant))
1205 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1206 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1211 /* Like reconstruct_complex_type, but handle also template trees. */
1214 cp_reconstruct_complex_type (tree type, tree bottom)
1218 if (TREE_CODE (type) == POINTER_TYPE)
1220 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1221 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1222 TYPE_REF_CAN_ALIAS_ALL (type));
1224 else if (TREE_CODE (type) == REFERENCE_TYPE)
1226 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1227 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1228 TYPE_REF_CAN_ALIAS_ALL (type));
1230 else if (TREE_CODE (type) == ARRAY_TYPE)
1232 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1233 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1234 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1235 element type qualification will be handled by the recursive
1236 cp_reconstruct_complex_type call and cp_build_qualified_type
1237 for ARRAY_TYPEs changes the element type. */
1240 else if (TREE_CODE (type) == FUNCTION_TYPE)
1242 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1243 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1245 else if (TREE_CODE (type) == METHOD_TYPE)
1247 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1248 /* The build_method_type_directly() routine prepends 'this' to argument list,
1249 so we must compensate by getting rid of it. */
1251 = build_method_type_directly
1252 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1254 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1256 else if (TREE_CODE (type) == OFFSET_TYPE)
1258 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1259 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1264 if (TYPE_ATTRIBUTES (type))
1265 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1266 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1269 /* Like decl_attributes, but handle C++ complexity. */
1272 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1274 if (*decl == NULL_TREE || *decl == void_type_node
1275 || *decl == error_mark_node
1276 || attributes == NULL_TREE)
1279 if (processing_template_decl)
1281 if (check_for_bare_parameter_packs (attributes))
1284 save_template_attributes (&attributes, decl);
1285 if (attributes == NULL_TREE)
1289 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1290 decl = &DECL_TEMPLATE_RESULT (*decl);
1292 decl_attributes (decl, attributes, flags);
1294 if (TREE_CODE (*decl) == TYPE_DECL)
1295 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1298 /* Walks through the namespace- or function-scope anonymous union
1299 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1300 Returns one of the fields for use in the mangled name. */
1303 build_anon_union_vars (tree type, tree object)
1305 tree main_decl = NULL_TREE;
1308 /* Rather than write the code to handle the non-union case,
1309 just give an error. */
1310 if (TREE_CODE (type) != UNION_TYPE)
1311 error ("anonymous struct not inside named type");
1313 for (field = TYPE_FIELDS (type);
1315 field = TREE_CHAIN (field))
1320 if (DECL_ARTIFICIAL (field))
1322 if (TREE_CODE (field) != FIELD_DECL)
1324 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1325 "have non-static data members", field);
1329 if (TREE_PRIVATE (field))
1330 permerror (input_location, "private member %q+#D in anonymous union", field);
1331 else if (TREE_PROTECTED (field))
1332 permerror (input_location, "protected member %q+#D in anonymous union", field);
1334 if (processing_template_decl)
1335 ref = build_min_nt (COMPONENT_REF, object,
1336 DECL_NAME (field), NULL_TREE);
1338 ref = build_class_member_access_expr (object, field, NULL_TREE,
1339 false, tf_warning_or_error);
1341 if (DECL_NAME (field))
1345 decl = build_decl (input_location,
1346 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1347 DECL_ANON_UNION_VAR_P (decl) = 1;
1348 DECL_ARTIFICIAL (decl) = 1;
1350 base = get_base_address (object);
1351 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1352 TREE_STATIC (decl) = TREE_STATIC (base);
1353 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1355 SET_DECL_VALUE_EXPR (decl, ref);
1356 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1358 decl = pushdecl (decl);
1360 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1361 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1365 if (main_decl == NULL_TREE)
1372 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1373 anonymous union, then all members must be laid out together. PUBLIC_P
1374 is nonzero if this union is not declared static. */
1377 finish_anon_union (tree anon_union_decl)
1383 if (anon_union_decl == error_mark_node)
1386 type = TREE_TYPE (anon_union_decl);
1387 public_p = TREE_PUBLIC (anon_union_decl);
1389 /* The VAR_DECL's context is the same as the TYPE's context. */
1390 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1392 if (TYPE_FIELDS (type) == NULL_TREE)
1397 error ("namespace-scope anonymous aggregates must be static");
1401 main_decl = build_anon_union_vars (type, anon_union_decl);
1402 if (main_decl == error_mark_node)
1404 if (main_decl == NULL_TREE)
1406 warning (0, "anonymous union with no members");
1410 if (!processing_template_decl)
1412 /* Use main_decl to set the mangled name. */
1413 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1414 maybe_commonize_var (anon_union_decl);
1415 mangle_decl (anon_union_decl);
1416 DECL_NAME (anon_union_decl) = NULL_TREE;
1419 pushdecl (anon_union_decl);
1420 if (building_stmt_tree ()
1421 && at_function_scope_p ())
1422 add_decl_expr (anon_union_decl);
1423 else if (!processing_template_decl)
1424 rest_of_decl_compilation (anon_union_decl,
1425 toplevel_bindings_p (), at_eof);
1428 /* Auxiliary functions to make type signatures for
1429 `operator new' and `operator delete' correspond to
1430 what compiler will be expecting. */
1433 coerce_new_type (tree type)
1436 tree args = TYPE_ARG_TYPES (type);
1438 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1440 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1443 error ("%<operator new%> must return type %qT", ptr_type_node);
1446 if (args && args != void_list_node)
1448 if (TREE_PURPOSE (args))
1450 /* [basic.stc.dynamic.allocation]
1452 The first parameter shall not have an associated default
1454 error ("the first parameter of %<operator new%> cannot "
1455 "have a default argument");
1456 /* Throw away the default argument. */
1457 TREE_PURPOSE (args) = NULL_TREE;
1460 if (!same_type_p (TREE_VALUE (args), size_type_node))
1463 args = TREE_CHAIN (args);
1470 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1471 "as first parameter", size_type_node);
1476 args = tree_cons (NULL_TREE, size_type_node, args);
1479 type = build_exception_variant
1480 (build_function_type (ptr_type_node, args),
1481 TYPE_RAISES_EXCEPTIONS (type));
1489 coerce_delete_type (tree type)
1492 tree args = TYPE_ARG_TYPES (type);
1494 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1496 if (!same_type_p (TREE_TYPE (type), void_type_node))
1499 error ("%<operator delete%> must return type %qT", void_type_node);
1502 if (!args || args == void_list_node
1503 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1506 if (args && args != void_list_node)
1507 args = TREE_CHAIN (args);
1508 error ("%<operator delete%> takes type %qT as first parameter",
1514 args = tree_cons (NULL_TREE, ptr_type_node, args);
1517 type = build_exception_variant
1518 (build_function_type (void_type_node, args),
1519 TYPE_RAISES_EXCEPTIONS (type));
1527 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1528 and mark them as needed. */
1531 mark_vtable_entries (tree decl)
1534 unsigned HOST_WIDE_INT idx;
1536 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1541 STRIP_NOPS (fnaddr);
1543 if (TREE_CODE (fnaddr) != ADDR_EXPR
1544 && TREE_CODE (fnaddr) != FDESC_EXPR)
1545 /* This entry is an offset: a virtual base class offset, a
1546 virtual call offset, an RTTI offset, etc. */
1549 fn = TREE_OPERAND (fnaddr, 0);
1550 TREE_ADDRESSABLE (fn) = 1;
1551 /* When we don't have vcall offsets, we output thunks whenever
1552 we output the vtables that contain them. With vcall offsets,
1553 we know all the thunks we'll need when we emit a virtual
1554 function, so we emit the thunks there instead. */
1555 if (DECL_THUNK_P (fn))
1556 use_thunk (fn, /*emit_p=*/0);
1561 /* Set DECL up to have the closest approximation of "initialized common"
1562 linkage available. */
1565 comdat_linkage (tree decl)
1568 make_decl_one_only (decl, cxx_comdat_group (decl));
1569 else if (TREE_CODE (decl) == FUNCTION_DECL
1570 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1571 /* We can just emit function and compiler-generated variables
1572 statically; having multiple copies is (for the most part) only
1575 There are two correctness issues, however: the address of a
1576 template instantiation with external linkage should be the
1577 same, independent of what translation unit asks for the
1578 address, and this will not hold when we emit multiple copies of
1579 the function. However, there's little else we can do.
1581 Also, by default, the typeinfo implementation assumes that
1582 there will be only one copy of the string used as the name for
1583 each type. Therefore, if weak symbols are unavailable, the
1584 run-time library should perform a more conservative check; it
1585 should perform a string comparison, rather than an address
1587 TREE_PUBLIC (decl) = 0;
1590 /* Static data member template instantiations, however, cannot
1591 have multiple copies. */
1592 if (DECL_INITIAL (decl) == 0
1593 || DECL_INITIAL (decl) == error_mark_node)
1594 DECL_COMMON (decl) = 1;
1595 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1597 DECL_COMMON (decl) = 1;
1598 DECL_INITIAL (decl) = error_mark_node;
1600 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1602 /* We can't do anything useful; leave vars for explicit
1604 DECL_EXTERNAL (decl) = 1;
1605 DECL_NOT_REALLY_EXTERN (decl) = 0;
1609 DECL_COMDAT (decl) = 1;
1612 /* For win32 we also want to put explicit instantiations in
1613 linkonce sections, so that they will be merged with implicit
1614 instantiations; otherwise we get duplicate symbol errors.
1615 For Darwin we do not want explicit instantiations to be
1619 maybe_make_one_only (tree decl)
1621 /* We used to say that this was not necessary on targets that support weak
1622 symbols, because the implicit instantiations will defer to the explicit
1623 one. However, that's not actually the case in SVR4; a strong definition
1624 after a weak one is an error. Also, not making explicit
1625 instantiations one_only means that we can end up with two copies of
1626 some template instantiations. */
1630 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1631 we can get away with not emitting them if they aren't used. We need
1632 to for variables so that cp_finish_decl will update their linkage,
1633 because their DECL_INITIAL may not have been set properly yet. */
1635 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1636 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1637 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1639 make_decl_one_only (decl, cxx_comdat_group (decl));
1641 if (TREE_CODE (decl) == VAR_DECL)
1643 DECL_COMDAT (decl) = 1;
1644 /* Mark it needed so we don't forget to emit it. */
1645 mark_decl_referenced (decl);
1650 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1651 This predicate will give the right answer during parsing of the
1652 function, which other tests may not. */
1655 vague_linkage_p (tree decl)
1657 /* Unfortunately, import_export_decl has not always been called
1658 before the function is processed, so we cannot simply check
1660 return (DECL_COMDAT (decl)
1661 || (((TREE_CODE (decl) == FUNCTION_DECL
1662 && DECL_DECLARED_INLINE_P (decl))
1663 || (DECL_LANG_SPECIFIC (decl)
1664 && DECL_TEMPLATE_INSTANTIATION (decl)))
1665 && TREE_PUBLIC (decl)));
1668 /* Determine whether or not we want to specifically import or export CTYPE,
1669 using various heuristics. */
1672 import_export_class (tree ctype)
1674 /* -1 for imported, 1 for exported. */
1675 int import_export = 0;
1677 /* It only makes sense to call this function at EOF. The reason is
1678 that this function looks at whether or not the first non-inline
1679 non-abstract virtual member function has been defined in this
1680 translation unit. But, we can't possibly know that until we've
1681 seen the entire translation unit. */
1682 gcc_assert (at_eof);
1684 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1687 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1688 we will have CLASSTYPE_INTERFACE_ONLY set but not
1689 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1690 heuristic because someone will supply a #pragma implementation
1691 elsewhere, and deducing it here would produce a conflict. */
1692 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1695 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1697 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1699 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1700 && !flag_implicit_templates)
1701 /* For a template class, without -fimplicit-templates, check the
1702 repository. If the virtual table is assigned to this
1703 translation unit, then export the class; otherwise, import
1705 import_export = repo_export_class_p (ctype) ? 1 : -1;
1706 else if (TYPE_POLYMORPHIC_P (ctype))
1708 /* The ABI specifies that the virtual table and associated
1709 information are emitted with the key method, if any. */
1710 tree method = CLASSTYPE_KEY_METHOD (ctype);
1711 /* If weak symbol support is not available, then we must be
1712 careful not to emit the vtable when the key function is
1713 inline. An inline function can be defined in multiple
1714 translation units. If we were to emit the vtable in each
1715 translation unit containing a definition, we would get
1716 multiple definition errors at link-time. */
1717 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1718 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1721 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1722 a definition anywhere else. */
1723 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1726 /* Allow back ends the chance to overrule the decision. */
1727 if (targetm.cxx.import_export_class)
1728 import_export = targetm.cxx.import_export_class (ctype, import_export);
1732 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1733 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1737 /* Return true if VAR has already been provided to the back end; in that
1738 case VAR should not be modified further by the front end. */
1740 var_finalized_p (tree var)
1742 return varpool_node (var)->finalized;
1745 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1746 must be emitted in this translation unit. Mark it as such. */
1749 mark_needed (tree decl)
1751 /* It's possible that we no longer need to set
1752 TREE_SYMBOL_REFERENCED here directly, but doing so is
1754 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1755 mark_decl_referenced (decl);
1758 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1759 returns true if a definition of this entity should be provided in
1760 this object file. Callers use this function to determine whether
1761 or not to let the back end know that a definition of DECL is
1762 available in this translation unit. */
1765 decl_needed_p (tree decl)
1767 gcc_assert (TREE_CODE (decl) == VAR_DECL
1768 || TREE_CODE (decl) == FUNCTION_DECL);
1769 /* This function should only be called at the end of the translation
1770 unit. We cannot be sure of whether or not something will be
1771 COMDAT until that point. */
1772 gcc_assert (at_eof);
1774 /* All entities with external linkage that are not COMDAT should be
1775 emitted; they may be referred to from other object files. */
1776 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1778 /* If this entity was used, let the back end see it; it will decide
1779 whether or not to emit it into the object file. */
1780 if (TREE_USED (decl)
1781 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1782 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1784 /* Functions marked "dllexport" must be emitted so that they are
1785 visible to other DLLs. */
1786 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1788 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1789 reference to DECL might cause it to be emitted later. */
1793 /* If necessary, write out the vtables for the dynamic class CTYPE.
1794 Returns true if any vtables were emitted. */
1797 maybe_emit_vtables (tree ctype)
1803 /* If the vtables for this class have already been emitted there is
1804 nothing more to do. */
1805 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1806 if (var_finalized_p (primary_vtbl))
1808 /* Ignore dummy vtables made by get_vtable_decl. */
1809 if (TREE_TYPE (primary_vtbl) == void_type_node)
1812 /* On some targets, we cannot determine the key method until the end
1813 of the translation unit -- which is when this function is
1815 if (!targetm.cxx.key_method_may_be_inline ())
1816 determine_key_method (ctype);
1818 /* See if any of the vtables are needed. */
1819 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1821 import_export_decl (vtbl);
1822 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1827 /* If the references to this class' vtables are optimized away,
1828 still emit the appropriate debugging information. See
1830 if (DECL_COMDAT (primary_vtbl)
1831 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1832 note_debug_info_needed (ctype);
1836 /* The ABI requires that we emit all of the vtables if we emit any
1838 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1840 /* Mark entities references from the virtual table as used. */
1841 mark_vtable_entries (vtbl);
1843 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1845 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1847 /* It had better be all done at compile-time. */
1852 DECL_EXTERNAL (vtbl) = 0;
1853 rest_of_decl_compilation (vtbl, 1, 1);
1855 /* Because we're only doing syntax-checking, we'll never end up
1856 actually marking the variable as written. */
1857 if (flag_syntax_only)
1858 TREE_ASM_WRITTEN (vtbl) = 1;
1861 /* Since we're writing out the vtable here, also write the debug
1863 note_debug_info_needed (ctype);
1868 /* A special return value from type_visibility meaning internal
1871 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1873 /* walk_tree helper function for type_visibility. */
1876 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1878 int *vis_p = (int *)data;
1883 else if (CLASS_TYPE_P (*tp))
1885 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1887 *vis_p = VISIBILITY_ANON;
1890 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1891 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1896 /* Returns the visibility of TYPE, which is the minimum visibility of its
1900 type_visibility (tree type)
1902 int vis = VISIBILITY_DEFAULT;
1903 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1907 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1908 specified (or if VISIBILITY is static). */
1911 constrain_visibility (tree decl, int visibility)
1913 if (visibility == VISIBILITY_ANON)
1915 /* extern "C" declarations aren't affected by the anonymous
1917 if (!DECL_EXTERN_C_P (decl))
1919 TREE_PUBLIC (decl) = 0;
1920 DECL_WEAK (decl) = 0;
1921 DECL_COMMON (decl) = 0;
1922 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1923 DECL_INTERFACE_KNOWN (decl) = 1;
1924 if (DECL_LANG_SPECIFIC (decl))
1925 DECL_NOT_REALLY_EXTERN (decl) = 1;
1928 else if (visibility > DECL_VISIBILITY (decl)
1929 && !DECL_VISIBILITY_SPECIFIED (decl))
1931 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1937 /* Constrain the visibility of DECL based on the visibility of its template
1941 constrain_visibility_for_template (tree decl, tree targs)
1943 /* If this is a template instantiation, check the innermost
1944 template args for visibility constraints. The outer template
1945 args are covered by the class check. */
1946 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1948 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1952 tree arg = TREE_VEC_ELT (args, i-1);
1954 vis = type_visibility (arg);
1955 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1958 if (TREE_CODE (arg) == ADDR_EXPR)
1959 arg = TREE_OPERAND (arg, 0);
1960 if (TREE_CODE (arg) == VAR_DECL
1961 || TREE_CODE (arg) == FUNCTION_DECL)
1963 if (! TREE_PUBLIC (arg))
1964 vis = VISIBILITY_ANON;
1966 vis = DECL_VISIBILITY (arg);
1970 constrain_visibility (decl, vis);
1974 /* Like c_determine_visibility, but with additional C++-specific
1977 Function-scope entities can rely on the function's visibility because
1978 it is set in start_preparsed_function.
1980 Class-scope entities cannot rely on the class's visibility until the end
1981 of the enclosing class definition.
1983 Note that because namespaces have multiple independent definitions,
1984 namespace visibility is handled elsewhere using the #pragma visibility
1985 machinery rather than by decorating the namespace declaration.
1987 The goal is for constraints from the type to give a diagnostic, and
1988 other constraints to be applied silently. */
1991 determine_visibility (tree decl)
1993 tree class_type = NULL_TREE;
1995 bool orig_visibility_specified;
1996 enum symbol_visibility orig_visibility;
1998 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2000 /* Only relevant for names with external linkage. */
2001 if (!TREE_PUBLIC (decl))
2004 /* Cloned constructors and destructors get the same visibility as
2005 the underlying function. That should be set up in
2006 maybe_clone_body. */
2007 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2009 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2010 orig_visibility = DECL_VISIBILITY (decl);
2012 if (TREE_CODE (decl) == TYPE_DECL)
2014 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2015 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2016 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2021 else if (DECL_LANG_SPECIFIC (decl))
2022 use_template = DECL_USE_TEMPLATE (decl);
2026 /* If DECL is a member of a class, visibility specifiers on the
2027 class can influence the visibility of the DECL. */
2028 if (DECL_CLASS_SCOPE_P (decl))
2029 class_type = DECL_CONTEXT (decl);
2032 /* Not a class member. */
2034 /* Virtual tables have DECL_CONTEXT set to their associated class,
2035 so they are automatically handled above. */
2036 gcc_assert (TREE_CODE (decl) != VAR_DECL
2037 || !DECL_VTABLE_OR_VTT_P (decl));
2039 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2041 /* Local statics and classes get the visibility of their
2042 containing function by default, except that
2043 -fvisibility-inlines-hidden doesn't affect them. */
2044 tree fn = DECL_CONTEXT (decl);
2045 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2047 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2048 DECL_VISIBILITY_SPECIFIED (decl) =
2049 DECL_VISIBILITY_SPECIFIED (fn);
2052 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2054 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2055 but have no TEMPLATE_INFO, so don't try to check it. */
2058 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2059 && flag_visibility_ms_compat)
2061 /* Under -fvisibility-ms-compat, types are visible by default,
2062 even though their contents aren't. */
2063 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2064 int underlying_vis = type_visibility (underlying_type);
2065 if (underlying_vis == VISIBILITY_ANON
2066 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
2067 constrain_visibility (decl, underlying_vis);
2069 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2071 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2073 /* tinfo visibility is based on the type it's for. */
2074 constrain_visibility
2075 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2077 /* Give the target a chance to override the visibility associated
2079 if (TREE_PUBLIC (decl)
2080 && !DECL_REALLY_EXTERN (decl)
2081 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2082 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2083 targetm.cxx.determine_class_data_visibility (decl);
2085 else if (use_template)
2086 /* Template instantiations and specializations get visibility based
2087 on their template unless they override it with an attribute. */;
2088 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2090 /* Set default visibility to whatever the user supplied with
2091 #pragma GCC visibility or a namespace visibility attribute. */
2092 DECL_VISIBILITY (decl) = default_visibility;
2093 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2099 /* If the specialization doesn't specify visibility, use the
2100 visibility from the template. */
2101 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2102 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2103 : DECL_TEMPLATE_INFO (decl));
2104 tree args = TI_ARGS (tinfo);
2106 if (args != error_mark_node)
2108 int depth = TMPL_ARGS_DEPTH (args);
2109 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2111 if (!DECL_VISIBILITY_SPECIFIED (decl))
2113 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2114 DECL_VISIBILITY_SPECIFIED (decl)
2115 = DECL_VISIBILITY_SPECIFIED (pattern);
2118 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2119 if (args && depth > template_class_depth (class_type))
2120 /* Limit visibility based on its template arguments. */
2121 constrain_visibility_for_template (decl, args);
2126 determine_visibility_from_class (decl, class_type);
2128 if (decl_anon_ns_mem_p (decl))
2129 /* Names in an anonymous namespace get internal linkage.
2130 This might change once we implement export. */
2131 constrain_visibility (decl, VISIBILITY_ANON);
2132 else if (TREE_CODE (decl) != TYPE_DECL)
2134 /* Propagate anonymity from type to decl. */
2135 int tvis = type_visibility (TREE_TYPE (decl));
2136 if (tvis == VISIBILITY_ANON
2137 || ! DECL_VISIBILITY_SPECIFIED (decl))
2138 constrain_visibility (decl, tvis);
2140 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2141 /* DR 757: A type without linkage shall not be used as the type of a
2142 variable or function with linkage, unless
2143 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2144 o the variable or function is not used (3.2 [basic.def.odr]) or is
2145 defined in the same translation unit.
2147 Since non-extern "C" decls need to be defined in the same
2148 translation unit, we can make the type internal. */
2149 constrain_visibility (decl, VISIBILITY_ANON);
2151 /* If visibility changed and DECL already has DECL_RTL, ensure
2152 symbol flags are updated. */
2153 if ((DECL_VISIBILITY (decl) != orig_visibility
2154 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2155 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2156 || TREE_CODE (decl) == FUNCTION_DECL)
2157 && DECL_RTL_SET_P (decl))
2158 make_decl_rtl (decl);
2161 /* By default, static data members and function members receive
2162 the visibility of their containing class. */
2165 determine_visibility_from_class (tree decl, tree class_type)
2167 if (DECL_VISIBILITY_SPECIFIED (decl))
2170 if (visibility_options.inlines_hidden
2171 /* Don't do this for inline templates; specializations might not be
2172 inline, and we don't want them to inherit the hidden
2173 visibility. We'll set it here for all inline instantiations. */
2174 && !processing_template_decl
2175 && TREE_CODE (decl) == FUNCTION_DECL
2176 && DECL_DECLARED_INLINE_P (decl)
2177 && (! DECL_LANG_SPECIFIC (decl)
2178 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2179 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2182 /* Default to the class visibility. */
2183 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2184 DECL_VISIBILITY_SPECIFIED (decl)
2185 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2188 /* Give the target a chance to override the visibility associated
2190 if (TREE_CODE (decl) == VAR_DECL
2191 && (DECL_TINFO_P (decl)
2192 || (DECL_VTABLE_OR_VTT_P (decl)
2193 /* Construction virtual tables are not exported because
2194 they cannot be referred to from other object files;
2195 their name is not standardized by the ABI. */
2196 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2197 && TREE_PUBLIC (decl)
2198 && !DECL_REALLY_EXTERN (decl)
2199 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2200 targetm.cxx.determine_class_data_visibility (decl);
2203 /* Constrain the visibility of a class TYPE based on the visibility of its
2204 field types. Warn if any fields require lesser visibility. */
2207 constrain_class_visibility (tree type)
2213 int vis = type_visibility (type);
2215 if (vis == VISIBILITY_ANON
2216 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2219 /* Don't warn about visibility if the class has explicit visibility. */
2220 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2221 vis = VISIBILITY_INTERNAL;
2223 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2224 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2226 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2227 int subvis = type_visibility (ftype);
2229 if (subvis == VISIBILITY_ANON)
2231 if (!in_main_input_context ())
2233 %qT has a field %qD whose type uses the anonymous namespace",
2236 else if (MAYBE_CLASS_TYPE_P (ftype)
2237 && vis < VISIBILITY_HIDDEN
2238 && subvis >= VISIBILITY_HIDDEN)
2239 warning (OPT_Wattributes, "\
2240 %qT declared with greater visibility than the type of its field %qD",
2244 binfo = TYPE_BINFO (type);
2245 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2247 int subvis = type_visibility (TREE_TYPE (t));
2249 if (subvis == VISIBILITY_ANON)
2251 if (!in_main_input_context())
2253 %qT has a base %qT whose type uses the anonymous namespace",
2254 type, TREE_TYPE (t));
2256 else if (vis < VISIBILITY_HIDDEN
2257 && subvis >= VISIBILITY_HIDDEN)
2258 warning (OPT_Wattributes, "\
2259 %qT declared with greater visibility than its base %qT",
2260 type, TREE_TYPE (t));
2264 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2265 for DECL has not already been determined, do so now by setting
2266 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2267 function is called entities with vague linkage whose definitions
2268 are available must have TREE_PUBLIC set.
2270 If this function decides to place DECL in COMDAT, it will set
2271 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2272 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2273 callers defer that decision until it is clear that DECL is actually
2277 import_export_decl (tree decl)
2282 tree class_type = NULL_TREE;
2284 if (DECL_INTERFACE_KNOWN (decl))
2287 /* We cannot determine what linkage to give to an entity with vague
2288 linkage until the end of the file. For example, a virtual table
2289 for a class will be defined if and only if the key method is
2290 defined in this translation unit. As a further example, consider
2291 that when compiling a translation unit that uses PCH file with
2292 "-frepo" it would be incorrect to make decisions about what
2293 entities to emit when building the PCH; those decisions must be
2294 delayed until the repository information has been processed. */
2295 gcc_assert (at_eof);
2296 /* Object file linkage for explicit instantiations is handled in
2297 mark_decl_instantiated. For static variables in functions with
2298 vague linkage, maybe_commonize_var is used.
2300 Therefore, the only declarations that should be provided to this
2301 function are those with external linkage that are:
2303 * implicit instantiations of function templates
2307 * implicit instantiations of static data members of class
2314 Furthermore, all entities that reach this point must have a
2315 definition available in this translation unit.
2317 The following assertions check these conditions. */
2318 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2319 || TREE_CODE (decl) == VAR_DECL);
2320 /* Any code that creates entities with TREE_PUBLIC cleared should
2321 also set DECL_INTERFACE_KNOWN. */
2322 gcc_assert (TREE_PUBLIC (decl));
2323 if (TREE_CODE (decl) == FUNCTION_DECL)
2324 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2325 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2326 || DECL_DECLARED_INLINE_P (decl));
2328 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2329 || DECL_VTABLE_OR_VTT_P (decl)
2330 || DECL_TINFO_P (decl));
2331 /* Check that a definition of DECL is available in this translation
2333 gcc_assert (!DECL_REALLY_EXTERN (decl));
2335 /* Assume that DECL will not have COMDAT linkage. */
2337 /* Assume that DECL will not be imported into this translation
2341 /* See if the repository tells us whether or not to emit DECL in
2342 this translation unit. */
2343 emit_p = repo_emit_p (decl);
2346 else if (emit_p == 1)
2348 /* The repository indicates that this entity should be defined
2349 here. Make sure the back end honors that request. */
2350 if (TREE_CODE (decl) == VAR_DECL)
2352 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2353 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2356 FOR_EACH_CLONE (clone, decl)
2357 mark_needed (clone);
2361 /* Output the definition as an ordinary strong definition. */
2362 DECL_EXTERNAL (decl) = 0;
2363 DECL_INTERFACE_KNOWN (decl) = 1;
2368 /* We have already decided what to do with this DECL; there is no
2369 need to check anything further. */
2371 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2373 class_type = DECL_CONTEXT (decl);
2374 import_export_class (class_type);
2375 if (TYPE_FOR_JAVA (class_type))
2377 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2378 && CLASSTYPE_INTERFACE_ONLY (class_type))
2380 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2381 && !CLASSTYPE_USE_TEMPLATE (class_type)
2382 && CLASSTYPE_KEY_METHOD (class_type)
2383 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2384 /* The ABI requires that all virtual tables be emitted with
2385 COMDAT linkage. However, on systems where COMDAT symbols
2386 don't show up in the table of contents for a static
2387 archive, or on systems without weak symbols (where we
2388 approximate COMDAT linkage by using internal linkage), the
2389 linker will report errors about undefined symbols because
2390 it will not see the virtual table definition. Therefore,
2391 in the case that we know that the virtual table will be
2392 emitted in only one translation unit, we make the virtual
2393 table an ordinary definition with external linkage. */
2394 DECL_EXTERNAL (decl) = 0;
2395 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2397 /* CLASS_TYPE is being exported from this translation unit,
2398 so DECL should be defined here. */
2399 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2400 /* If a class is declared in a header with the "extern
2401 template" extension, then it will not be instantiated,
2402 even in translation units that would normally require
2403 it. Often such classes are explicitly instantiated in
2404 one translation unit. Therefore, the explicit
2405 instantiation must be made visible to other translation
2407 DECL_EXTERNAL (decl) = 0;
2410 /* The generic C++ ABI says that class data is always
2411 COMDAT, even if there is a key function. Some
2412 variants (e.g., the ARM EABI) says that class data
2413 only has COMDAT linkage if the class data might be
2414 emitted in more than one translation unit. When the
2415 key method can be inline and is inline, we still have
2416 to arrange for comdat even though
2417 class_data_always_comdat is false. */
2418 if (!CLASSTYPE_KEY_METHOD (class_type)
2419 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2420 || targetm.cxx.class_data_always_comdat ())
2422 /* The ABI requires COMDAT linkage. Normally, we
2423 only emit COMDAT things when they are needed;
2424 make sure that we realize that this entity is
2431 else if (!flag_implicit_templates
2432 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2437 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2439 tree type = TREE_TYPE (DECL_NAME (decl));
2440 if (CLASS_TYPE_P (type))
2443 import_export_class (type);
2444 if (CLASSTYPE_INTERFACE_KNOWN (type)
2445 && TYPE_POLYMORPHIC_P (type)
2446 && CLASSTYPE_INTERFACE_ONLY (type)
2447 /* If -fno-rtti was specified, then we cannot be sure
2448 that RTTI information will be emitted with the
2449 virtual table of the class, so we must emit it
2450 wherever it is used. */
2455 if (CLASSTYPE_INTERFACE_KNOWN (type)
2456 && !CLASSTYPE_INTERFACE_ONLY (type))
2458 comdat_p = (targetm.cxx.class_data_always_comdat ()
2459 || (CLASSTYPE_KEY_METHOD (type)
2460 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2465 DECL_EXTERNAL (decl) = 0;
2475 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2476 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2478 /* DECL is an implicit instantiation of a function or static
2480 if ((flag_implicit_templates
2481 && !flag_use_repository)
2482 || (flag_implicit_inline_templates
2483 && TREE_CODE (decl) == FUNCTION_DECL
2484 && DECL_DECLARED_INLINE_P (decl)))
2487 /* If we are not implicitly generating templates, then mark
2488 this entity as undefined in this translation unit. */
2491 else if (DECL_FUNCTION_MEMBER_P (decl))
2493 if (!DECL_DECLARED_INLINE_P (decl))
2495 tree ctype = DECL_CONTEXT (decl);
2496 import_export_class (ctype);
2497 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2499 DECL_NOT_REALLY_EXTERN (decl)
2500 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2501 || (DECL_DECLARED_INLINE_P (decl)
2502 && ! flag_implement_inlines
2503 && !DECL_VINDEX (decl)));
2505 if (!DECL_NOT_REALLY_EXTERN (decl))
2506 DECL_EXTERNAL (decl) = 1;
2508 /* Always make artificials weak. */
2509 if (DECL_ARTIFICIAL (decl) && flag_weak)
2512 maybe_make_one_only (decl);
2523 /* If we are importing DECL into this translation unit, mark is
2524 an undefined here. */
2525 DECL_EXTERNAL (decl) = 1;
2526 DECL_NOT_REALLY_EXTERN (decl) = 0;
2530 /* If we decided to put DECL in COMDAT, mark it accordingly at
2532 comdat_linkage (decl);
2535 DECL_INTERFACE_KNOWN (decl) = 1;
2538 /* Return an expression that performs the destruction of DECL, which
2539 must be a VAR_DECL whose type has a non-trivial destructor, or is
2540 an array whose (innermost) elements have a non-trivial destructor. */
2543 build_cleanup (tree decl)
2546 tree type = TREE_TYPE (decl);
2548 /* This function should only be called for declarations that really
2549 require cleanups. */
2550 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2552 /* Treat all objects with destructors as used; the destructor may do
2553 something substantive. */
2556 if (TREE_CODE (type) == ARRAY_TYPE)
2559 temp = build_address (decl);
2560 temp = build_delete (TREE_TYPE (temp), temp,
2561 sfk_complete_destructor,
2562 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2566 /* Returns the initialization guard variable for the variable DECL,
2567 which has static storage duration. */
2570 get_guard (tree decl)
2575 sname = mangle_guard_variable (decl);
2576 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2581 /* We use a type that is big enough to contain a mutex as well
2582 as an integer counter. */
2583 guard_type = targetm.cxx.guard_type ();
2584 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2585 VAR_DECL, sname, guard_type);
2587 /* The guard should have the same linkage as what it guards. */
2588 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2589 TREE_STATIC (guard) = TREE_STATIC (decl);
2590 DECL_COMMON (guard) = DECL_COMMON (decl);
2591 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2592 if (DECL_ONE_ONLY (decl))
2593 make_decl_one_only (guard, cxx_comdat_group (guard));
2594 if (TREE_PUBLIC (decl))
2595 DECL_WEAK (guard) = DECL_WEAK (decl);
2596 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2597 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2599 DECL_ARTIFICIAL (guard) = 1;
2600 DECL_IGNORED_P (guard) = 1;
2601 TREE_USED (guard) = 1;
2602 pushdecl_top_level_and_finish (guard, NULL_TREE);
2607 /* Return those bits of the GUARD variable that should be set when the
2608 guarded entity is actually initialized. */
2611 get_guard_bits (tree guard)
2613 if (!targetm.cxx.guard_mask_bit ())
2615 /* We only set the first byte of the guard, in order to leave room
2616 for a mutex in the high-order bits. */
2617 guard = build1 (ADDR_EXPR,
2618 build_pointer_type (TREE_TYPE (guard)),
2620 guard = build1 (NOP_EXPR,
2621 build_pointer_type (char_type_node),
2623 guard = build1 (INDIRECT_REF, char_type_node, guard);
2629 /* Return an expression which determines whether or not the GUARD
2630 variable has already been initialized. */
2633 get_guard_cond (tree guard)
2637 /* Check to see if the GUARD is zero. */
2638 guard = get_guard_bits (guard);
2640 /* Mask off all but the low bit. */
2641 if (targetm.cxx.guard_mask_bit ())
2643 guard_value = integer_one_node;
2644 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2645 guard_value = convert (TREE_TYPE (guard), guard_value);
2646 guard = cp_build_binary_op (input_location,
2647 BIT_AND_EXPR, guard, guard_value,
2648 tf_warning_or_error);
2651 guard_value = integer_zero_node;
2652 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2653 guard_value = convert (TREE_TYPE (guard), guard_value);
2654 return cp_build_binary_op (input_location,
2655 EQ_EXPR, guard, guard_value,
2656 tf_warning_or_error);
2659 /* Return an expression which sets the GUARD variable, indicating that
2660 the variable being guarded has been initialized. */
2663 set_guard (tree guard)
2667 /* Set the GUARD to one. */
2668 guard = get_guard_bits (guard);
2669 guard_init = integer_one_node;
2670 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2671 guard_init = convert (TREE_TYPE (guard), guard_init);
2672 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2673 tf_warning_or_error);
2676 /* Start the process of running a particular set of global constructors
2677 or destructors. Subroutine of do_[cd]tors. */
2680 start_objects (int method_type, int initp)
2686 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2688 if (initp != DEFAULT_INIT_PRIORITY)
2698 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2701 sprintf (type, "%c", method_type);
2703 fndecl = build_lang_decl (FUNCTION_DECL,
2704 get_file_function_name (type),
2705 build_function_type (void_type_node,
2707 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2709 TREE_PUBLIC (current_function_decl) = 0;
2711 /* Mark as artificial because it's not explicitly in the user's
2713 DECL_ARTIFICIAL (current_function_decl) = 1;
2715 /* Mark this declaration as used to avoid spurious warnings. */
2716 TREE_USED (current_function_decl) = 1;
2718 /* Mark this function as a global constructor or destructor. */
2719 if (method_type == 'I')
2720 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2722 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2724 body = begin_compound_stmt (BCS_FN_BODY);
2729 /* Finish the process of running a particular set of global constructors
2730 or destructors. Subroutine of do_[cd]tors. */
2733 finish_objects (int method_type, int initp, tree body)
2738 finish_compound_stmt (body);
2739 fn = finish_function (0);
2741 if (method_type == 'I')
2743 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2744 decl_init_priority_insert (fn, initp);
2748 DECL_STATIC_DESTRUCTOR (fn) = 1;
2749 decl_fini_priority_insert (fn, initp);
2752 expand_or_defer_fn (fn);
2755 /* The names of the parameters to the function created to handle
2756 initializations and destructions for objects with static storage
2758 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2759 #define PRIORITY_IDENTIFIER "__priority"
2761 /* The name of the function we create to handle initializations and
2762 destructions for objects with static storage duration. */
2763 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2765 /* The declaration for the __INITIALIZE_P argument. */
2766 static GTY(()) tree initialize_p_decl;
2768 /* The declaration for the __PRIORITY argument. */
2769 static GTY(()) tree priority_decl;
2771 /* The declaration for the static storage duration function. */
2772 static GTY(()) tree ssdf_decl;
2774 /* All the static storage duration functions created in this
2775 translation unit. */
2776 static GTY(()) VEC(tree,gc) *ssdf_decls;
2778 /* A map from priority levels to information about that priority
2779 level. There may be many such levels, so efficient lookup is
2781 static splay_tree priority_info_map;
2783 /* Begins the generation of the function that will handle all
2784 initialization and destruction of objects with static storage
2785 duration. The function generated takes two parameters of type
2786 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2787 nonzero, it performs initializations. Otherwise, it performs
2788 destructions. It only performs those initializations or
2789 destructions with the indicated __PRIORITY. The generated function
2792 It is assumed that this function will only be called once per
2793 translation unit. */
2796 start_static_storage_duration_function (unsigned count)
2801 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2803 /* Create the identifier for this function. It will be of the form
2804 SSDF_IDENTIFIER_<number>. */
2805 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2807 /* Create the parameters. */
2808 parm_types = void_list_node;
2809 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2810 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2811 type = build_function_type (void_type_node, parm_types);
2813 /* Create the FUNCTION_DECL itself. */
2814 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2815 get_identifier (id),
2817 TREE_PUBLIC (ssdf_decl) = 0;
2818 DECL_ARTIFICIAL (ssdf_decl) = 1;
2820 /* Put this function in the list of functions to be called from the
2821 static constructors and destructors. */
2824 ssdf_decls = VEC_alloc (tree, gc, 32);
2826 /* Take this opportunity to initialize the map from priority
2827 numbers to information about that priority level. */
2828 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2829 /*delete_key_fn=*/0,
2830 /*delete_value_fn=*/
2831 (splay_tree_delete_value_fn) &free);
2833 /* We always need to generate functions for the
2834 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2835 priorities later, we'll be sure to find the
2836 DEFAULT_INIT_PRIORITY. */
2837 get_priority_info (DEFAULT_INIT_PRIORITY);
2840 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2842 /* Create the argument list. */
2843 initialize_p_decl = cp_build_parm_decl
2844 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2845 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2846 TREE_USED (initialize_p_decl) = 1;
2847 priority_decl = cp_build_parm_decl
2848 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2849 DECL_CONTEXT (priority_decl) = ssdf_decl;
2850 TREE_USED (priority_decl) = 1;
2852 TREE_CHAIN (initialize_p_decl) = priority_decl;
2853 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2855 /* Put the function in the global scope. */
2856 pushdecl (ssdf_decl);
2858 /* Start the function itself. This is equivalent to declaring the
2861 static void __ssdf (int __initialize_p, init __priority_p);
2863 It is static because we only need to call this function from the
2864 various constructor and destructor functions for this module. */
2865 start_preparsed_function (ssdf_decl,
2866 /*attrs=*/NULL_TREE,
2869 /* Set up the scope of the outermost block in the function. */
2870 body = begin_compound_stmt (BCS_FN_BODY);
2875 /* Finish the generation of the function which performs initialization
2876 and destruction of objects with static storage duration. After
2877 this point, no more such objects can be created. */
2880 finish_static_storage_duration_function (tree body)
2882 /* Close out the function. */
2883 finish_compound_stmt (body);
2884 expand_or_defer_fn (finish_function (0));
2887 /* Return the information about the indicated PRIORITY level. If no
2888 code to handle this level has yet been generated, generate the
2889 appropriate prologue. */
2891 static priority_info
2892 get_priority_info (int priority)
2897 n = splay_tree_lookup (priority_info_map,
2898 (splay_tree_key) priority);
2901 /* Create a new priority information structure, and insert it
2903 pi = XNEW (struct priority_info_s);
2904 pi->initializations_p = 0;
2905 pi->destructions_p = 0;
2906 splay_tree_insert (priority_info_map,
2907 (splay_tree_key) priority,
2908 (splay_tree_value) pi);
2911 pi = (priority_info) n->value;
2916 /* The effective initialization priority of a DECL. */
2918 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2919 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2920 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2922 /* Whether a DECL needs a guard to protect it against multiple
2925 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2926 || DECL_ONE_ONLY (decl) \
2927 || DECL_WEAK (decl)))
2929 /* Called from one_static_initialization_or_destruction(),
2931 Walks the initializer list of a global variable and looks for
2932 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2933 and that have their DECL_CONTEXT() == NULL.
2934 For each such temporary variable, set their DECL_CONTEXT() to
2935 the current function. This is necessary because otherwise
2936 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2937 when trying to refer to a temporary variable that does not have
2938 it's DECL_CONTECT() properly set. */
2940 fix_temporary_vars_context_r (tree *node,
2941 int *unused ATTRIBUTE_UNUSED,
2942 void *unused1 ATTRIBUTE_UNUSED)
2944 gcc_assert (current_function_decl);
2946 if (TREE_CODE (*node) == BIND_EXPR)
2950 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2951 if (TREE_CODE (var) == VAR_DECL
2953 && DECL_ARTIFICIAL (var)
2954 && !DECL_CONTEXT (var))
2955 DECL_CONTEXT (var) = current_function_decl;
2961 /* Set up to handle the initialization or destruction of DECL. If
2962 INITP is nonzero, we are initializing the variable. Otherwise, we
2963 are destroying it. */
2966 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2968 tree guard_if_stmt = NULL_TREE;
2971 /* If we are supposed to destruct and there's a trivial destructor,
2972 nothing has to be done. */
2974 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2977 /* Trick the compiler into thinking we are at the file and line
2978 where DECL was declared so that error-messages make sense, and so
2979 that the debugger will show somewhat sensible file and line
2981 input_location = DECL_SOURCE_LOCATION (decl);
2983 /* Make sure temporary variables in the initialiser all have
2984 their DECL_CONTEXT() set to a value different from NULL_TREE.
2985 This can happen when global variables initialisers are built.
2986 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2987 the temporary variables that might have been generated in the
2988 accompagning initialisers is NULL_TREE, meaning the variables have been
2989 declared in the global namespace.
2990 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2991 of the temporaries are set to the current function decl. */
2992 cp_walk_tree_without_duplicates (&init,
2993 fix_temporary_vars_context_r,
3000 Access control for implicit calls to the constructors,
3001 the conversion functions, or the destructor called to
3002 create and destroy a static data member is performed as
3003 if these calls appeared in the scope of the member's
3006 we pretend we are in a static member function of the class of
3007 which the DECL is a member. */
3008 if (member_p (decl))
3010 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3011 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3014 /* Assume we don't need a guard. */
3016 /* We need a guard if this is an object with external linkage that
3017 might be initialized in more than one place. (For example, a
3018 static data member of a template, when the data member requires
3020 if (NEEDS_GUARD_P (decl))
3024 guard = get_guard (decl);
3026 /* When using __cxa_atexit, we just check the GUARD as we would
3027 for a local static. */
3028 if (flag_use_cxa_atexit)
3030 /* When using __cxa_atexit, we never try to destroy
3031 anything from a static destructor. */
3033 guard_cond = get_guard_cond (guard);
3035 /* If we don't have __cxa_atexit, then we will be running
3036 destructors from .fini sections, or their equivalents. So,
3037 we need to know how many times we've tried to initialize this
3038 object. We do initializations only if the GUARD is zero,
3039 i.e., if we are the first to initialize the variable. We do
3040 destructions only if the GUARD is one, i.e., if we are the
3041 last to destroy the variable. */
3044 = cp_build_binary_op (input_location,
3046 cp_build_unary_op (PREINCREMENT_EXPR,
3049 tf_warning_or_error),
3051 tf_warning_or_error);
3054 = cp_build_binary_op (input_location,
3056 cp_build_unary_op (PREDECREMENT_EXPR,
3059 tf_warning_or_error),
3061 tf_warning_or_error);
3063 guard_if_stmt = begin_if_stmt ();
3064 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3068 /* If we're using __cxa_atexit, we have not already set the GUARD,
3069 so we must do so now. */
3070 if (guard && initp && flag_use_cxa_atexit)
3071 finish_expr_stmt (set_guard (guard));
3073 /* Perform the initialization or destruction. */
3077 finish_expr_stmt (init);
3079 /* If we're using __cxa_atexit, register a function that calls the
3080 destructor for the object. */
3081 if (flag_use_cxa_atexit)
3082 finish_expr_stmt (register_dtor_fn (decl));
3085 finish_expr_stmt (build_cleanup (decl));
3087 /* Finish the guard if-stmt, if necessary. */
3090 finish_then_clause (guard_if_stmt);
3091 finish_if_stmt (guard_if_stmt);
3094 /* Now that we're done with DECL we don't need to pretend to be a
3095 member of its class any longer. */
3096 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3097 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3100 /* Generate code to do the initialization or destruction of the decls in VARS,
3101 a TREE_LIST of VAR_DECL with static storage duration.
3102 Whether initialization or destruction is performed is specified by INITP. */
3105 do_static_initialization_or_destruction (tree vars, bool initp)
3107 tree node, init_if_stmt, cond;
3109 /* Build the outer if-stmt to check for initialization or destruction. */
3110 init_if_stmt = begin_if_stmt ();
3111 cond = initp ? integer_one_node : integer_zero_node;
3112 cond = cp_build_binary_op (input_location,
3116 tf_warning_or_error);
3117 finish_if_stmt_cond (cond, init_if_stmt);
3121 tree decl = TREE_VALUE (node);
3122 tree priority_if_stmt;
3126 /* If we don't need a destructor, there's nothing to do. Avoid
3127 creating a possibly empty if-stmt. */
3128 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3130 node = TREE_CHAIN (node);
3134 /* Remember that we had an initialization or finalization at this
3136 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3137 pi = get_priority_info (priority);
3139 pi->initializations_p = 1;
3141 pi->destructions_p = 1;
3143 /* Conditionalize this initialization on being in the right priority
3144 and being initializing/finalizing appropriately. */
3145 priority_if_stmt = begin_if_stmt ();
3146 cond = cp_build_binary_op (input_location,
3149 build_int_cst (NULL_TREE, priority),
3150 tf_warning_or_error);
3151 finish_if_stmt_cond (cond, priority_if_stmt);
3153 /* Process initializers with same priority. */
3155 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3156 node = TREE_CHAIN (node))
3157 /* Do one initialization or destruction. */
3158 one_static_initialization_or_destruction (TREE_VALUE (node),
3159 TREE_PURPOSE (node), initp);
3161 /* Finish up the priority if-stmt body. */
3162 finish_then_clause (priority_if_stmt);
3163 finish_if_stmt (priority_if_stmt);
3167 /* Finish up the init/destruct if-stmt body. */
3168 finish_then_clause (init_if_stmt);
3169 finish_if_stmt (init_if_stmt);
3172 /* VARS is a list of variables with static storage duration which may
3173 need initialization and/or finalization. Remove those variables
3174 that don't really need to be initialized or finalized, and return
3175 the resulting list. The order in which the variables appear in
3176 VARS is in reverse order of the order in which they should actually
3177 be initialized. The list we return is in the unreversed order;
3178 i.e., the first variable should be initialized first. */
3181 prune_vars_needing_no_initialization (tree *vars)
3184 tree result = NULL_TREE;
3189 tree decl = TREE_VALUE (t);
3190 tree init = TREE_PURPOSE (t);
3192 /* Deal gracefully with error. */
3193 if (decl == error_mark_node)
3195 var = &TREE_CHAIN (t);
3199 /* The only things that can be initialized are variables. */
3200 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3202 /* If this object is not defined, we don't need to do anything
3204 if (DECL_EXTERNAL (decl))
3206 var = &TREE_CHAIN (t);
3210 /* Also, if the initializer already contains errors, we can bail
3212 if (init && TREE_CODE (init) == TREE_LIST
3213 && value_member (error_mark_node, init))
3215 var = &TREE_CHAIN (t);
3219 /* This variable is going to need initialization and/or
3220 finalization, so we add it to the list. */
3221 *var = TREE_CHAIN (t);
3222 TREE_CHAIN (t) = result;
3229 /* Make sure we have told the back end about all the variables in
3233 write_out_vars (tree vars)
3237 for (v = vars; v; v = TREE_CHAIN (v))
3239 tree var = TREE_VALUE (v);
3240 if (!var_finalized_p (var))
3242 import_export_decl (var);
3243 rest_of_decl_compilation (var, 1, 1);
3248 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3249 (otherwise) that will initialize all global objects with static
3250 storage duration having the indicated PRIORITY. */
3253 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3262 input_location = *locus;
3264 /* Was: locus->line++; */
3266 /* We use `I' to indicate initialization and `D' to indicate
3268 function_key = constructor_p ? 'I' : 'D';
3270 /* We emit the function lazily, to avoid generating empty
3271 global constructors and destructors. */
3274 /* For Objective-C++, we may need to initialize metadata found in this module.
3275 This must be done _before_ any other static initializations. */
3276 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3277 && constructor_p && objc_static_init_needed_p ())
3279 body = start_objects (function_key, priority);
3280 objc_generate_static_init_call (NULL_TREE);
3283 /* Call the static storage duration function with appropriate
3285 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3287 /* Calls to pure or const functions will expand to nothing. */
3288 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3291 body = start_objects (function_key, priority);
3293 arguments = tree_cons (NULL_TREE,
3294 build_int_cst (NULL_TREE, priority),
3296 arguments = tree_cons (NULL_TREE,
3297 build_int_cst (NULL_TREE, constructor_p),
3299 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3300 tf_warning_or_error));
3304 /* Close out the function. */
3306 finish_objects (function_key, priority, body);
3309 /* Generate constructor and destructor functions for the priority
3313 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3315 location_t *locus = (location_t *) data;
3316 int priority = (int) n->key;
3317 priority_info pi = (priority_info) n->value;
3319 /* Generate the functions themselves, but only if they are really
3321 if (pi->initializations_p)
3322 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3323 if (pi->destructions_p)
3324 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3326 /* Keep iterating. */
3330 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3331 decls referenced from front-end specific constructs; it will be called
3332 only for language-specific tree nodes.
3334 Here we must deal with member pointers. */
3337 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3341 switch (TREE_CODE (t))
3344 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3345 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3348 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3349 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3352 if (DECL_VTABLE_OR_VTT_P (t))
3354 /* The ABI requires that all virtual tables be emitted
3355 whenever one of them is. */
3357 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3359 vtbl = TREE_CHAIN (vtbl))
3360 mark_decl_referenced (vtbl);
3362 else if (DECL_CONTEXT (t)
3363 && flag_use_repository
3364 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3365 /* If we need a static variable in a function, then we
3366 need the containing function. */
3367 mark_decl_referenced (DECL_CONTEXT (t));
3376 /* Java requires that we be able to reference a local address for a
3377 method, and not be confused by PLT entries. If hidden aliases are
3378 supported, collect and return all the functions for which we should
3379 emit a hidden alias. */
3381 static struct pointer_set_t *
3382 collect_candidates_for_java_method_aliases (void)
3384 struct cgraph_node *node;
3385 struct pointer_set_t *candidates = NULL;
3387 #ifndef HAVE_GAS_HIDDEN
3391 for (node = cgraph_nodes; node ; node = node->next)
3393 tree fndecl = node->decl;
3395 if (DECL_CONTEXT (fndecl)
3396 && TYPE_P (DECL_CONTEXT (fndecl))
3397 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3398 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3400 if (candidates == NULL)
3401 candidates = pointer_set_create ();
3402 pointer_set_insert (candidates, fndecl);
3410 /* Java requires that we be able to reference a local address for a
3411 method, and not be confused by PLT entries. If hidden aliases are
3412 supported, emit one for each java function that we've emitted.
3413 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3414 by collect_candidates_for_java_method_aliases. */
3417 build_java_method_aliases (struct pointer_set_t *candidates)
3419 struct cgraph_node *node;
3421 #ifndef HAVE_GAS_HIDDEN
3425 for (node = cgraph_nodes; node ; node = node->next)
3427 tree fndecl = node->decl;
3429 if (TREE_ASM_WRITTEN (fndecl)
3430 && pointer_set_contains (candidates, fndecl))
3432 /* Mangle the name in a predictable way; we need to reference
3433 this from a java compiled object file. */
3434 tree oid, nid, alias;
3438 oid = DECL_ASSEMBLER_NAME (fndecl);
3439 oname = IDENTIFIER_POINTER (oid);
3440 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3441 nname = ACONCAT (("_ZGA", oname+2, NULL));
3442 nid = get_identifier (nname);
3444 alias = make_alias_for (fndecl, nid);
3445 TREE_PUBLIC (alias) = 1;
3446 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3448 assemble_alias (alias, oid);
3453 /* Returns true iff there is a definition available for variable or
3457 decl_defined_p (tree decl)
3459 if (TREE_CODE (decl) == FUNCTION_DECL)
3460 return (DECL_INITIAL (decl) != NULL_TREE);
3463 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3464 return !DECL_EXTERNAL (decl);
3468 /* Complain that DECL uses a type with no linkage but is never defined. */
3471 no_linkage_error (tree decl)
3473 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3474 if (TYPE_ANONYMOUS_P (t))
3476 permerror (0, "%q+#D, declared using anonymous type, "
3477 "is used but never defined", decl);
3478 if (is_typedef_decl (TYPE_NAME (t)))
3479 permerror (0, "%q+#D does not refer to the unqualified type, "
3480 "so it is not used for linkage", TYPE_NAME (t));
3483 permerror (0, "%q+#D, declared using local type %qT, "
3484 "is used but never defined", decl, t);
3487 /* This routine is called at the end of compilation.
3488 Its job is to create all the code needed to initialize and
3489 destroy the global aggregates. We do the destruction
3490 first, since that way we only need to reverse the decls once. */
3493 cp_write_global_declarations (void)
3499 unsigned ssdf_count = 0;
3502 struct pointer_set_t *candidates;
3504 locus = input_location;
3507 /* Bad parse errors. Just forget about it. */
3508 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3512 c_common_write_pch ();
3514 /* FIXME - huh? was input_line -= 1;*/
3516 /* We now have to write out all the stuff we put off writing out.
3519 o Template specializations that we have not yet instantiated,
3520 but which are needed.
3521 o Initialization and destruction for non-local objects with
3522 static storage duration. (Local objects with static storage
3523 duration are initialized when their scope is first entered,
3524 and are cleaned up via atexit.)
3525 o Virtual function tables.
3527 All of these may cause others to be needed. For example,
3528 instantiating one function may cause another to be needed, and
3529 generating the initializer for an object may cause templates to be
3530 instantiated, etc., etc. */
3532 timevar_push (TV_VARCONST);
3534 emit_support_tinfos ();
3543 /* If there are templates that we've put off instantiating, do
3545 instantiate_pending_templates (retries);
3548 /* Write out virtual tables as required. Note that writing out
3549 the virtual table for a template class may cause the
3550 instantiation of members of that class. If we write out
3551 vtables then we remove the class from our list so we don't
3552 have to look at it again. */
3554 while (keyed_classes != NULL_TREE
3555 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3558 keyed_classes = TREE_CHAIN (keyed_classes);
3564 tree next = TREE_CHAIN (t);
3568 if (maybe_emit_vtables (TREE_VALUE (next)))
3571 TREE_CHAIN (t) = TREE_CHAIN (next);
3576 next = TREE_CHAIN (t);
3580 /* Write out needed type info variables. We have to be careful
3581 looping through unemitted decls, because emit_tinfo_decl may
3582 cause other variables to be needed. New elements will be
3583 appended, and we remove from the vector those that actually
3585 for (i = VEC_length (tree, unemitted_tinfo_decls);
3586 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3587 if (emit_tinfo_decl (t))
3590 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3593 /* The list of objects with static storage duration is built up
3594 in reverse order. We clear STATIC_AGGREGATES so that any new
3595 aggregates added during the initialization of these will be
3596 initialized in the correct order when we next come around the
3598 vars = prune_vars_needing_no_initialization (&static_aggregates);
3602 /* We need to start a new initialization function each time
3603 through the loop. That's because we need to know which
3604 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3605 isn't computed until a function is finished, and written
3606 out. That's a deficiency in the back end. When this is
3607 fixed, these initialization functions could all become
3608 inline, with resulting performance improvements. */
3611 /* Set the line and file, so that it is obviously not from
3613 input_location = locus;
3614 ssdf_body = start_static_storage_duration_function (ssdf_count);
3616 /* Make sure the back end knows about all the variables. */
3617 write_out_vars (vars);
3619 /* First generate code to do all the initializations. */
3621 do_static_initialization_or_destruction (vars, /*initp=*/true);
3623 /* Then, generate code to do all the destructions. Do these
3624 in reverse order so that the most recently constructed
3625 variable is the first destroyed. If we're using
3626 __cxa_atexit, then we don't need to do this; functions
3627 were registered at initialization time to destroy the
3629 if (!flag_use_cxa_atexit && vars)
3631 vars = nreverse (vars);
3632 do_static_initialization_or_destruction (vars, /*initp=*/false);
3637 /* Finish up the static storage duration function for this
3639 input_location = locus;
3640 finish_static_storage_duration_function (ssdf_body);
3642 /* All those initializations and finalizations might cause
3643 us to need more inline functions, more template
3644 instantiations, etc. */
3647 /* ??? was: locus.line++; */
3650 /* Go through the set of inline functions whose bodies have not
3651 been emitted yet. If out-of-line copies of these functions
3652 are required, emit them. */
3653 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3655 /* Does it need synthesizing? */
3656 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3657 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3659 /* Even though we're already at the top-level, we push
3660 there again. That way, when we pop back a few lines
3661 hence, all of our state is restored. Otherwise,
3662 finish_function doesn't clean things up, and we end
3663 up with CURRENT_FUNCTION_DECL set. */
3664 push_to_top_level ();
3665 /* The decl's location will mark where it was first
3666 needed. Save that so synthesize method can indicate
3667 where it was needed from, in case of error */
3668 input_location = DECL_SOURCE_LOCATION (decl);
3669 synthesize_method (decl);
3670 pop_from_top_level ();
3674 if (!DECL_SAVED_TREE (decl))
3677 /* We lie to the back end, pretending that some functions
3678 are not defined when they really are. This keeps these
3679 functions from being put out unnecessarily. But, we must
3680 stop lying when the functions are referenced, or if they
3681 are not comdat since they need to be put out now. If
3682 DECL_INTERFACE_KNOWN, then we have already set
3683 DECL_EXTERNAL appropriately, so there's no need to check
3684 again, and we do not want to clear DECL_EXTERNAL if a
3685 previous call to import_export_decl set it.
3687 This is done in a separate for cycle, because if some
3688 deferred function is contained in another deferred
3689 function later in deferred_fns varray,
3690 rest_of_compilation would skip this function and we
3691 really cannot expand the same function twice. */
3692 import_export_decl (decl);
3693 if (DECL_NOT_REALLY_EXTERN (decl)
3694 && DECL_INITIAL (decl)
3695 && decl_needed_p (decl))
3697 struct cgraph_node *node = cgraph_get_node (decl), *alias, *next;
3699 DECL_EXTERNAL (decl) = 0;
3700 /* If we mark !DECL_EXTERNAL one of the same body aliases,
3701 we need to mark all of them that way. */
3702 if (node && node->same_body)
3704 DECL_EXTERNAL (node->decl) = 0;
3705 for (alias = node->same_body; alias; alias = alias->next)
3706 DECL_EXTERNAL (alias->decl) = 0;
3708 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3709 group, we need to mark all symbols in the same comdat group
3711 if (node->same_comdat_group)
3712 for (next = node->same_comdat_group;
3714 next = next->same_comdat_group)
3716 DECL_EXTERNAL (next->decl) = 0;
3717 if (next->same_body)
3719 for (alias = next->same_body;
3721 alias = alias->next)
3722 DECL_EXTERNAL (alias->decl) = 0;
3727 /* If we're going to need to write this function out, and
3728 there's already a body for it, create RTL for it now.
3729 (There might be no body if this is a method we haven't
3730 gotten around to synthesizing yet.) */
3731 if (!DECL_EXTERNAL (decl)
3732 && decl_needed_p (decl)
3733 && !TREE_ASM_WRITTEN (decl)
3734 && !cgraph_node (decl)->local.finalized)
3736 /* We will output the function; no longer consider it in this
3738 DECL_DEFER_OUTPUT (decl) = 0;
3739 /* Generate RTL for this function now that we know we
3741 expand_or_defer_fn (decl);
3742 /* If we're compiling -fsyntax-only pretend that this
3743 function has been written out so that we don't try to
3745 if (flag_syntax_only)
3746 TREE_ASM_WRITTEN (decl) = 1;
3751 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3754 /* Static data members are just like namespace-scope globals. */
3755 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3757 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3758 /* Don't write it out if we haven't seen a definition. */
3759 || DECL_IN_AGGR_P (decl))
3761 import_export_decl (decl);
3762 /* If this static data member is needed, provide it to the
3764 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3765 DECL_EXTERNAL (decl) = 0;
3767 if (VEC_length (tree, pending_statics) != 0
3768 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3769 VEC_length (tree, pending_statics)))
3776 /* All used inline functions must have a definition at this point. */
3777 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3779 if (/* Check online inline functions that were actually used. */
3780 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3781 /* If the definition actually was available here, then the
3782 fact that the function was not defined merely represents
3783 that for some reason (use of a template repository,
3784 #pragma interface, etc.) we decided not to emit the
3786 && !DECL_INITIAL (decl)
3787 /* An explicit instantiation can be used to specify
3788 that the body is in another unit. It will have
3789 already verified there was a definition. */
3790 && !DECL_EXPLICIT_INSTANTIATION (decl))
3792 warning (0, "inline function %q+D used but never defined", decl);
3793 /* Avoid a duplicate warning from check_global_declaration_1. */
3794 TREE_NO_WARNING (decl) = 1;
3798 /* So must decls that use a type with no linkage. */
3799 for (i = 0; VEC_iterate (tree, no_linkage_decls, i, decl); ++i)
3800 if (!decl_defined_p (decl))
3801 no_linkage_error (decl);
3803 /* We give C linkage to static constructors and destructors. */
3804 push_lang_context (lang_name_c);
3806 /* Generate initialization and destruction functions for all
3807 priorities for which they are required. */
3808 if (priority_info_map)
3809 splay_tree_foreach (priority_info_map,
3810 generate_ctor_and_dtor_functions_for_priority,
3812 else if (c_dialect_objc () && objc_static_init_needed_p ())
3813 /* If this is obj-c++ and we need a static init, call
3814 generate_ctor_or_dtor_function. */
3815 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3816 DEFAULT_INIT_PRIORITY, &locus);
3818 /* We're done with the splay-tree now. */
3819 if (priority_info_map)
3820 splay_tree_delete (priority_info_map);
3822 /* Generate any missing aliases. */
3823 maybe_apply_pending_pragma_weaks ();
3825 /* We're done with static constructors, so we can go back to "C++"
3827 pop_lang_context ();
3829 /* Collect candidates for Java hidden aliases. */
3830 candidates = collect_candidates_for_java_method_aliases ();
3832 cgraph_finalize_compilation_unit ();
3834 /* Now, issue warnings about static, but not defined, functions,
3835 etc., and emit debugging information. */
3836 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3837 if (VEC_length (tree, pending_statics) != 0)
3839 check_global_declarations (VEC_address (tree, pending_statics),
3840 VEC_length (tree, pending_statics));
3841 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3842 VEC_length (tree, pending_statics));
3845 /* Generate hidden aliases for Java. */
3848 build_java_method_aliases (candidates);
3849 pointer_set_destroy (candidates);
3854 /* The entire file is now complete. If requested, dump everything
3858 FILE *stream = dump_begin (TDI_tu, &flags);
3862 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3863 dump_end (TDI_tu, stream);
3867 timevar_pop (TV_VARCONST);
3869 if (flag_detailed_statistics)
3871 dump_tree_statistics ();
3872 dump_time_statistics ();
3874 input_location = locus;
3876 #ifdef ENABLE_CHECKING
3877 validate_conversion_obstack ();
3878 #endif /* ENABLE_CHECKING */
3881 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3882 function to call in parse-tree form; it has not yet been
3883 semantically analyzed. ARGS are the arguments to the function.
3884 They have already been semantically analyzed. This may change
3888 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
3891 VEC(tree,gc) *orig_args = NULL;
3896 object = TREE_OPERAND (fn, 0);
3898 if (processing_template_decl)
3900 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3901 || TREE_CODE (fn) == MEMBER_REF);
3902 if (type_dependent_expression_p (fn)
3903 || any_type_dependent_arguments_p (*args))
3904 return build_nt_call_vec (fn, *args);
3906 orig_args = make_tree_vector_copy (*args);
3908 /* Transform the arguments and add the implicit "this"
3909 parameter. That must be done before the FN is transformed
3910 because we depend on the form of FN. */
3911 make_args_non_dependent (*args);
3912 object = build_non_dependent_expr (object);
3913 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3914 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3915 VEC_safe_insert (tree, gc, *args, 0, object);
3916 /* Now that the arguments are done, transform FN. */
3917 fn = build_non_dependent_expr (fn);
3920 /* A qualified name corresponding to a bound pointer-to-member is
3921 represented as an OFFSET_REF:
3923 struct B { void g(); };
3925 void B::g() { (this->*p)(); } */
3926 if (TREE_CODE (fn) == OFFSET_REF)
3928 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3929 tf_warning_or_error);
3930 fn = TREE_OPERAND (fn, 1);
3931 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3932 VEC_safe_insert (tree, gc, *args, 0, object_addr);
3935 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
3936 if (processing_template_decl && expr != error_mark_node)
3937 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
3939 if (orig_args != NULL)
3940 release_tree_vector (orig_args);
3947 check_default_args (tree x)
3949 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3950 bool saw_def = false;
3951 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3952 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3954 if (TREE_PURPOSE (arg))
3958 error ("default argument missing for parameter %P of %q+#D", i, x);
3959 TREE_PURPOSE (arg) = error_mark_node;
3964 /* Return true if function DECL can be inlined. This is used to force
3965 instantiation of methods that might be interesting for inlining. */
3967 possibly_inlined_p (tree decl)
3969 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3970 if (DECL_UNINLINABLE (decl))
3972 if (!optimize || pragma_java_exceptions)
3973 return DECL_DECLARED_INLINE_P (decl);
3974 /* When optimizing, we might inline everything when flatten
3975 attribute or heuristics inlining for size or autoinlining
3980 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3981 If DECL is a specialization or implicitly declared class member,
3982 generate the actual definition. */
3985 mark_used (tree decl)
3987 HOST_WIDE_INT saved_processing_template_decl = 0;
3989 /* If DECL is a BASELINK for a single function, then treat it just
3990 like the DECL for the function. Otherwise, if the BASELINK is
3991 for an overloaded function, we don't know which function was
3992 actually used until after overload resolution. */
3993 if (TREE_CODE (decl) == BASELINK)
3995 decl = BASELINK_FUNCTIONS (decl);
3996 if (really_overloaded_fn (decl))
3998 decl = OVL_CURRENT (decl);
4001 /* Set TREE_USED for the benefit of -Wunused. */
4002 TREE_USED (decl) = 1;
4003 if (DECL_CLONED_FUNCTION_P (decl))
4004 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4006 if (TREE_CODE (decl) == FUNCTION_DECL
4007 && DECL_DELETED_FN (decl))
4009 error ("deleted function %q+D", decl);
4010 error ("used here");
4013 /* If we don't need a value, then we don't need to synthesize DECL. */
4014 if (cp_unevaluated_operand != 0)
4017 /* We can only check DECL_ODR_USED on variables or functions with
4018 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4019 might need special handling for. */
4020 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4021 || DECL_LANG_SPECIFIC (decl) == NULL
4022 || DECL_THUNK_P (decl))
4025 /* We only want to do this processing once. We don't need to keep trying
4026 to instantiate inline templates, because unit-at-a-time will make sure
4027 we get them compiled before functions that want to inline them. */
4028 if (DECL_ODR_USED (decl))
4031 /* If within finish_function, defer the rest until that function
4032 finishes, otherwise it might recurse. */
4033 if (defer_mark_used_calls)
4035 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4039 /* Normally, we can wait until instantiation-time to synthesize
4040 DECL. However, if DECL is a static data member initialized with
4041 a constant, we need the value right now because a reference to
4042 such a data member is not value-dependent. */
4043 if (TREE_CODE (decl) == VAR_DECL
4044 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4045 && DECL_CLASS_SCOPE_P (decl))
4047 /* Don't try to instantiate members of dependent types. We
4048 cannot just use dependent_type_p here because this function
4049 may be called from fold_non_dependent_expr, and then we may
4050 see dependent types, even though processing_template_decl
4052 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
4053 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
4055 /* Pretend that we are not in a template, even if we are, so
4056 that the static data member initializer will be processed. */
4057 saved_processing_template_decl = processing_template_decl;
4058 processing_template_decl = 0;
4061 if (processing_template_decl)
4064 DECL_ODR_USED (decl) = 1;
4065 if (DECL_CLONED_FUNCTION_P (decl))
4066 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4068 /* DR 757: A type without linkage shall not be used as the type of a
4069 variable or function with linkage, unless
4070 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4071 o the variable or function is not used (3.2 [basic.def.odr]) or is
4072 defined in the same translation unit. */
4073 if (cxx_dialect > cxx98
4074 && decl_linkage (decl) != lk_none
4075 && !DECL_EXTERN_C_P (decl)
4076 && !DECL_ARTIFICIAL (decl)
4077 && !decl_defined_p (decl)
4078 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4080 if (is_local_extern (decl))
4081 /* There's no way to define a local extern, and adding it to
4082 the vector interferes with GC, so give an error now. */
4083 no_linkage_error (decl);
4085 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4088 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4089 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4090 /* Remember it, so we can check it was defined. */
4091 note_vague_linkage_fn (decl);
4093 /* Is it a synthesized method that needs to be synthesized? */
4094 if (TREE_CODE (decl) == FUNCTION_DECL
4095 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4096 && DECL_DEFAULTED_FN (decl)
4097 && ! DECL_INITIAL (decl))
4099 /* Remember the current location for a function we will end up
4100 synthesizing. Then we can inform the user where it was
4101 required in the case of error. */
4102 DECL_SOURCE_LOCATION (decl) = input_location;
4104 /* Synthesizing an implicitly defined member function will result in
4105 garbage collection. We must treat this situation as if we were
4106 within the body of a function so as to avoid collecting live data
4107 on the stack (such as overload resolution candidates).
4109 We could just let cp_write_global_declarations handle synthesizing
4110 this function, since we just added it to deferred_fns, but doing
4111 it at the use site produces better error messages. */
4113 synthesize_method (decl);
4115 /* If this is a synthesized method we don't need to
4116 do the instantiation test below. */
4118 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4119 && DECL_TEMPLATE_INFO (decl)
4120 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4121 || always_instantiate_p (decl)))
4122 /* If this is a function or variable that is an instance of some
4123 template, we now know that we will need to actually do the
4124 instantiation. We check that DECL is not an explicit
4125 instantiation because that is not checked in instantiate_decl.
4127 We put off instantiating functions in order to improve compile
4128 times. Maintaining a stack of active functions is expensive,
4129 and the inliner knows to instantiate any functions it might
4130 need. Therefore, we always try to defer instantiation. */
4131 instantiate_decl (decl, /*defer_ok=*/true,
4132 /*expl_inst_class_mem_p=*/false);
4134 processing_template_decl = saved_processing_template_decl;
4137 #include "gt-cp-decl2.h"