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
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"
56 extern cpp_reader *parse_in;
58 /* This structure contains information about the initializations
59 and/or destructions required for a particular priority level. */
60 typedef struct priority_info_s {
61 /* Nonzero if there have been any initializations at this priority
62 throughout the translation unit. */
63 int initializations_p;
64 /* Nonzero if there have been any destructions at this priority
65 throughout the translation unit. */
69 static void mark_vtable_entries (tree);
70 static bool maybe_emit_vtables (tree);
71 static bool acceptable_java_type (tree);
72 static tree start_objects (int, int);
73 static void finish_objects (int, int, tree);
74 static tree start_static_storage_duration_function (unsigned);
75 static void finish_static_storage_duration_function (tree);
76 static priority_info get_priority_info (int);
77 static void do_static_initialization_or_destruction (tree, bool);
78 static void one_static_initialization_or_destruction (tree, tree, bool);
79 static void generate_ctor_or_dtor_function (bool, int, location_t *);
80 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
82 static tree prune_vars_needing_no_initialization (tree *);
83 static void write_out_vars (tree);
84 static void import_export_class (tree);
85 static tree get_guard_bits (tree);
86 static void determine_visibility_from_class (tree, tree);
88 /* A list of static class variables. This is needed, because a
89 static class variable can be declared inside the class without
90 an initializer, and then initialized, statically, outside the class. */
91 static GTY(()) VEC(tree,gc) *pending_statics;
93 /* A list of functions which were declared inline, but which we
94 may need to emit outline anyway. */
95 static GTY(()) VEC(tree,gc) *deferred_fns;
97 /* Nonzero if we're done parsing and into end-of-file activities. */
103 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
104 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
105 that apply to the function). */
108 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
113 if (fntype == error_mark_node || ctype == error_mark_node)
114 return error_mark_node;
116 type_quals = quals & ~TYPE_QUAL_RESTRICT;
117 ctype = cp_build_qualified_type (ctype, type_quals);
118 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
119 (TREE_CODE (fntype) == METHOD_TYPE
120 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
121 : TYPE_ARG_TYPES (fntype)));
122 raises = TYPE_RAISES_EXCEPTIONS (fntype);
124 fntype = build_exception_variant (fntype, raises);
129 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
133 cp_build_parm_decl (tree name, tree type)
135 tree parm = build_decl (PARM_DECL, name, type);
136 /* DECL_ARG_TYPE is only used by the back end and the back end never
138 if (!processing_template_decl)
139 DECL_ARG_TYPE (parm) = type_passed_as (type);
141 /* If the type is a pack expansion, then we have a function
143 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
144 FUNCTION_PARAMETER_PACK_P (parm) = 1;
149 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
153 build_artificial_parm (tree name, tree type)
155 tree parm = cp_build_parm_decl (name, type);
156 DECL_ARTIFICIAL (parm) = 1;
157 /* All our artificial parms are implicitly `const'; they cannot be
159 TREE_READONLY (parm) = 1;
163 /* Constructors for types with virtual baseclasses need an "in-charge" flag
164 saying whether this constructor is responsible for initialization of
165 virtual baseclasses or not. All destructors also need this "in-charge"
166 flag, which additionally determines whether or not the destructor should
167 free the memory for the object.
169 This function adds the "in-charge" flag to member function FN if
170 appropriate. It is called from grokclassfn and tsubst.
171 FN must be either a constructor or destructor.
173 The in-charge flag follows the 'this' parameter, and is followed by the
174 VTT parm (if any), then the user-written parms. */
177 maybe_retrofit_in_chrg (tree fn)
179 tree basetype, arg_types, parms, parm, fntype;
181 /* If we've already add the in-charge parameter don't do it again. */
182 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
185 /* When processing templates we can't know, in general, whether or
186 not we're going to have virtual baseclasses. */
187 if (processing_template_decl)
190 /* We don't need an in-charge parameter for constructors that don't
191 have virtual bases. */
192 if (DECL_CONSTRUCTOR_P (fn)
193 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
196 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
197 basetype = TREE_TYPE (TREE_VALUE (arg_types));
198 arg_types = TREE_CHAIN (arg_types);
200 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
202 /* If this is a subobject constructor or destructor, our caller will
203 pass us a pointer to our VTT. */
204 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
206 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
208 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
209 TREE_CHAIN (parm) = parms;
212 /* ...and then to TYPE_ARG_TYPES. */
213 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
215 DECL_HAS_VTT_PARM_P (fn) = 1;
218 /* Then add the in-charge parm (before the VTT parm). */
219 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
220 TREE_CHAIN (parm) = parms;
222 arg_types = hash_tree_chain (integer_type_node, arg_types);
224 /* Insert our new parameter(s) into the list. */
225 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
227 /* And rebuild the function type. */
228 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
230 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
231 fntype = build_exception_variant (fntype,
232 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
233 TREE_TYPE (fn) = fntype;
235 /* Now we've got the in-charge parameter. */
236 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
239 /* Classes overload their constituent function names automatically.
240 When a function name is declared in a record structure,
241 its name is changed to it overloaded name. Since names for
242 constructors and destructors can conflict, we place a leading
245 CNAME is the name of the class we are grokking for.
247 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
249 FLAGS contains bits saying what's special about today's
250 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
252 If FUNCTION is a destructor, then we must add the `auto-delete' field
253 as a second parameter. There is some hair associated with the fact
254 that we must "declare" this variable in the manner consistent with the
255 way the rest of the arguments were declared.
257 QUALS are the qualifiers for the this pointer. */
260 grokclassfn (tree ctype, tree function, enum overload_flags flags)
262 tree fn_name = DECL_NAME (function);
264 /* Even within an `extern "C"' block, members get C++ linkage. See
265 [dcl.link] for details. */
266 SET_DECL_LANGUAGE (function, lang_cplusplus);
268 if (fn_name == NULL_TREE)
270 error ("name missing for member function");
271 fn_name = get_identifier ("<anonymous>");
272 DECL_NAME (function) = fn_name;
275 DECL_CONTEXT (function) = ctype;
277 if (flags == DTOR_FLAG)
278 DECL_DESTRUCTOR_P (function) = 1;
280 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
281 maybe_retrofit_in_chrg (function);
284 /* Create an ARRAY_REF, checking for the user doing things backwards
288 grok_array_decl (tree array_expr, tree index_exp)
292 tree orig_array_expr = array_expr;
293 tree orig_index_exp = index_exp;
295 if (error_operand_p (array_expr) || error_operand_p (index_exp))
296 return error_mark_node;
298 if (processing_template_decl)
300 if (type_dependent_expression_p (array_expr)
301 || type_dependent_expression_p (index_exp))
302 return build_min_nt (ARRAY_REF, array_expr, index_exp,
303 NULL_TREE, NULL_TREE);
304 array_expr = build_non_dependent_expr (array_expr);
305 index_exp = build_non_dependent_expr (index_exp);
308 type = TREE_TYPE (array_expr);
310 type = non_reference (type);
312 /* If they have an `operator[]', use that. */
313 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
314 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
315 array_expr, index_exp, NULL_TREE,
316 /*overloaded_p=*/NULL, tf_warning_or_error);
321 /* Otherwise, create an ARRAY_REF for a pointer or array type.
322 It is a little-known fact that, if `a' is an array and `i' is
323 an int, you can write `i[a]', which means the same thing as
325 if (TREE_CODE (type) == ARRAY_TYPE)
328 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
330 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
333 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
335 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
337 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
340 if ((p1 && i2) && (i1 && p2))
341 error ("ambiguous conversion for array subscript");
344 array_expr = p1, index_exp = i2;
346 array_expr = p2, index_exp = i1;
349 error ("invalid types %<%T[%T]%> for array subscript",
350 type, TREE_TYPE (index_exp));
351 return error_mark_node;
354 if (array_expr == error_mark_node || index_exp == error_mark_node)
355 error ("ambiguous conversion for array subscript");
357 expr = build_array_ref (array_expr, index_exp, input_location);
359 if (processing_template_decl && expr != error_mark_node)
360 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
361 NULL_TREE, NULL_TREE);
365 /* Given the cast expression EXP, checking out its validity. Either return
366 an error_mark_node if there was an unavoidable error, return a cast to
367 void for trying to delete a pointer w/ the value 0, or return the
368 call to delete. If DOING_VEC is true, we handle things differently
369 for doing an array delete.
370 Implements ARM $5.3.4. This is called from the parser. */
373 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
377 if (exp == error_mark_node)
380 if (processing_template_decl)
382 t = build_min (DELETE_EXPR, void_type_node, exp, size);
383 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
384 DELETE_EXPR_USE_VEC (t) = doing_vec;
385 TREE_SIDE_EFFECTS (t) = 1;
389 /* An array can't have been allocated by new, so complain. */
390 if (TREE_CODE (exp) == VAR_DECL
391 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
392 warning (0, "deleting array %q#D", exp);
394 t = build_expr_type_conversion (WANT_POINTER, exp, true);
396 if (t == NULL_TREE || t == error_mark_node)
398 error ("type %q#T argument given to %<delete%>, expected pointer",
400 return error_mark_node;
403 type = TREE_TYPE (t);
405 /* As of Valley Forge, you can delete a pointer to const. */
407 /* You can't delete functions. */
408 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
410 error ("cannot delete a function. Only pointer-to-objects are "
411 "valid arguments to %<delete%>");
412 return error_mark_node;
415 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
416 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
418 warning (0, "deleting %qT is undefined", type);
422 /* Deleting a pointer with the value zero is valid and has no effect. */
423 if (integer_zerop (t))
424 return build1 (NOP_EXPR, void_type_node, t);
427 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
428 sfk_deleting_destructor,
431 return build_delete (type, t, sfk_deleting_destructor,
432 LOOKUP_NORMAL, use_global_delete);
435 /* Report an error if the indicated template declaration is not the
436 sort of thing that should be a member template. */
439 check_member_template (tree tmpl)
443 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
444 decl = DECL_TEMPLATE_RESULT (tmpl);
446 if (TREE_CODE (decl) == FUNCTION_DECL
447 || (TREE_CODE (decl) == TYPE_DECL
448 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
450 /* The parser rejects template declarations in local classes. */
451 gcc_assert (!current_function_decl);
452 /* The parser rejects any use of virtual in a function template. */
453 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
454 && DECL_VIRTUAL_P (decl)));
456 /* The debug-information generating code doesn't know what to do
457 with member templates. */
458 DECL_IGNORED_P (tmpl) = 1;
461 error ("template declaration of %q#D", decl);
464 /* Return true iff TYPE is a valid Java parameter or return type. */
467 acceptable_java_type (tree type)
469 if (type == error_mark_node)
472 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
474 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
476 type = TREE_TYPE (type);
477 if (TREE_CODE (type) == RECORD_TYPE)
480 if (! TYPE_FOR_JAVA (type))
482 if (! CLASSTYPE_TEMPLATE_INFO (type))
484 args = CLASSTYPE_TI_ARGS (type);
485 i = TREE_VEC_LENGTH (args);
488 type = TREE_VEC_ELT (args, i);
489 if (TREE_CODE (type) == POINTER_TYPE)
490 type = TREE_TYPE (type);
491 if (! TYPE_FOR_JAVA (type))
500 /* For a METHOD in a Java class CTYPE, return true if
501 the parameter and return types are valid Java types.
502 Otherwise, print appropriate error messages, and return false. */
505 check_java_method (tree method)
508 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
509 tree ret_type = TREE_TYPE (TREE_TYPE (method));
511 if (!acceptable_java_type (ret_type))
513 error ("Java method %qD has non-Java return type %qT",
518 arg_types = TREE_CHAIN (arg_types);
519 if (DECL_HAS_IN_CHARGE_PARM_P (method))
520 arg_types = TREE_CHAIN (arg_types);
521 if (DECL_HAS_VTT_PARM_P (method))
522 arg_types = TREE_CHAIN (arg_types);
524 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
526 tree type = TREE_VALUE (arg_types);
527 if (!acceptable_java_type (type))
529 if (type != error_mark_node)
530 error ("Java method %qD has non-Java parameter type %qT",
538 /* Sanity check: report error if this function FUNCTION is not
539 really a member of the class (CTYPE) it is supposed to belong to.
540 TEMPLATE_PARMS is used to specify the template parameters of a member
541 template passed as FUNCTION_DECL. If the member template is passed as a
542 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
543 from the declaration. If the function is not a function template, it
545 It returns the original declaration for the function, NULL_TREE if
546 no declaration was found, error_mark_node if an error was emitted. */
549 check_classfn (tree ctype, tree function, tree template_parms)
555 if (DECL_USE_TEMPLATE (function)
556 && !(TREE_CODE (function) == TEMPLATE_DECL
557 && DECL_TEMPLATE_SPECIALIZATION (function))
558 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
559 /* Since this is a specialization of a member template,
560 we're not going to find the declaration in the class.
563 struct S { template <typename T> void f(T); };
564 template <> void S::f(int);
566 we're not going to find `S::f(int)', but there's no
567 reason we should, either. We let our callers know we didn't
568 find the method, but we don't complain. */
571 /* Basic sanity check: for a template function, the template parameters
572 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
573 if (TREE_CODE (function) == TEMPLATE_DECL)
576 && !comp_template_parms (template_parms,
577 DECL_TEMPLATE_PARMS (function)))
579 error ("template parameter lists provided don't match the "
580 "template parameters of %qD", function);
581 return error_mark_node;
583 template_parms = DECL_TEMPLATE_PARMS (function);
586 /* OK, is this a definition of a member template? */
587 is_template = (template_parms != NULL_TREE);
589 /* We must enter the scope here, because conversion operators are
590 named by target type, and type equivalence relies on typenames
591 resolving within the scope of CTYPE. */
592 pushed_scope = push_scope (ctype);
593 ix = class_method_index_for_fn (complete_type (ctype), function);
596 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
597 tree fndecls, fndecl = 0;
599 const char *format = NULL;
601 for (fndecls = VEC_index (tree, methods, ix);
602 fndecls; fndecls = OVL_NEXT (fndecls))
606 fndecl = OVL_CURRENT (fndecls);
607 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
608 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
610 /* We cannot simply call decls_match because this doesn't
611 work for static member functions that are pretending to
612 be methods, and because the name may have been changed by
615 /* Get rid of the this parameter on functions that become
617 if (DECL_STATIC_FUNCTION_P (fndecl)
618 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
619 p1 = TREE_CHAIN (p1);
621 /* A member template definition only matches a member template
623 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
626 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
627 TREE_TYPE (TREE_TYPE (fndecl)))
628 && compparms (p1, p2)
630 || comp_template_parms (template_parms,
631 DECL_TEMPLATE_PARMS (fndecl)))
632 && (DECL_TEMPLATE_SPECIALIZATION (function)
633 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
634 && (!DECL_TEMPLATE_SPECIALIZATION (function)
635 || (DECL_TI_TEMPLATE (function)
636 == DECL_TI_TEMPLATE (fndecl))))
642 pop_scope (pushed_scope);
643 return OVL_CURRENT (fndecls);
646 error_at (DECL_SOURCE_LOCATION (function),
647 "prototype for %q#D does not match any in class %qT",
649 is_conv_op = DECL_CONV_FN_P (fndecl);
652 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
653 fndecls = VEC_index (tree, methods, ix);
656 fndecl = OVL_CURRENT (fndecls);
657 fndecls = OVL_NEXT (fndecls);
659 if (!fndecls && is_conv_op)
661 if (VEC_length (tree, methods) > (size_t) ++ix)
663 fndecls = VEC_index (tree, methods, ix);
664 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
676 format = N_("candidates are: %+#D");
678 format = N_("candidate is: %+#D");
679 error (format, fndecl);
682 else if (!COMPLETE_TYPE_P (ctype))
683 cxx_incomplete_type_error (function, ctype);
685 error ("no %q#D member function declared in class %qT",
689 pop_scope (pushed_scope);
690 return error_mark_node;
693 /* DECL is a function with vague linkage. Remember it so that at the
694 end of the translation unit we can decide whether or not to emit
698 note_vague_linkage_fn (tree decl)
700 if (!DECL_DEFERRED_FN (decl))
702 DECL_DEFERRED_FN (decl) = 1;
703 DECL_DEFER_OUTPUT (decl) = 1;
704 VEC_safe_push (tree, gc, deferred_fns, decl);
708 /* We have just processed the DECL, which is a static data member.
709 The other parameters are as for cp_finish_decl. */
712 finish_static_data_member_decl (tree decl,
713 tree init, bool init_const_expr_p,
717 DECL_CONTEXT (decl) = current_class_type;
719 /* We cannot call pushdecl here, because that would fill in the
720 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
721 the right thing, namely, to put this decl out straight away. */
723 if (! processing_template_decl)
724 VEC_safe_push (tree, gc, pending_statics, decl);
726 if (LOCAL_CLASS_P (current_class_type))
727 permerror (input_location, "local class %q#T shall not have static data member %q#D",
728 current_class_type, decl);
730 /* Static consts need not be initialized in the class definition. */
731 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
733 static int explained = 0;
735 error ("initializer invalid for static member with constructor");
738 error ("(an out of class initialization is required)");
743 /* Force the compiler to know when an uninitialized static const
744 member is being used. */
745 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
746 TREE_USED (decl) = 1;
747 DECL_INITIAL (decl) = init;
748 DECL_IN_AGGR_P (decl) = 1;
750 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
753 /* DECLARATOR and DECLSPECS correspond to a class member. The other
754 parameters are as for cp_finish_decl. Return the DECL for the
755 class member declared. */
758 grokfield (const cp_declarator *declarator,
759 cp_decl_specifier_seq *declspecs,
760 tree init, bool init_const_expr_p,
765 const char *asmspec = 0;
766 int flags = LOOKUP_ONLYCONVERTING;
769 && TREE_CODE (init) == TREE_LIST
770 && TREE_VALUE (init) == error_mark_node
771 && TREE_CHAIN (init) == NULL_TREE)
774 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
775 if (! value || error_operand_p (value))
776 /* friend or constructor went bad. */
777 return error_mark_node;
779 if (TREE_CODE (value) == TYPE_DECL && init)
781 error ("typedef %qD is initialized (use __typeof__ instead)", value);
785 /* Pass friendly classes back. */
786 if (value == void_type_node)
789 /* Pass friend decls back. */
790 if ((TREE_CODE (value) == FUNCTION_DECL
791 || TREE_CODE (value) == TEMPLATE_DECL)
792 && DECL_CONTEXT (value) != current_class_type)
795 if (DECL_NAME (value) != NULL_TREE
796 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
797 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
798 error ("member %qD conflicts with virtual function table field name",
801 /* Stash away type declarations. */
802 if (TREE_CODE (value) == TYPE_DECL)
804 DECL_NONLOCAL (value) = 1;
805 DECL_CONTEXT (value) = current_class_type;
807 if (declspecs->specs[(int)ds_typedef])
808 set_underlying_type (value);
810 if (processing_template_decl)
811 value = push_template_decl (value);
817 /* If this is a typedef that names the class for linkage purposes
818 (7.1.3p8), apply any attributes directly to the type. */
819 if (TAGGED_TYPE_P (TREE_TYPE (value))
820 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
821 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
823 cplus_decl_attributes (&value, attrlist, attrflags);
829 if (DECL_IN_AGGR_P (value))
831 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
832 return void_type_node;
835 if (asmspec_tree && asmspec_tree != error_mark_node)
836 asmspec = TREE_STRING_POINTER (asmspec_tree);
840 if (TREE_CODE (value) == FUNCTION_DECL)
842 /* Initializers for functions are rejected early in the parser.
843 If we get here, it must be a pure specifier for a method. */
844 if (init == ridpointers[(int)RID_DELETE])
846 DECL_DELETED_FN (value) = 1;
847 DECL_DECLARED_INLINE_P (value) = 1;
848 DECL_INITIAL (value) = error_mark_node;
850 else if (init == ridpointers[(int)RID_DEFAULT])
852 if (!defaultable_fn_p (value))
853 error ("%qD cannot be defaulted", value);
856 DECL_DEFAULTED_FN (value) = 1;
857 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
858 DECL_DECLARED_INLINE_P (value) = 1;
861 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
863 gcc_assert (error_operand_p (init) || integer_zerop (init));
864 DECL_PURE_VIRTUAL_P (value) = 1;
868 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
869 error ("initializer specified for static member function %qD",
873 else if (pedantic && TREE_CODE (value) != VAR_DECL)
874 /* Already complained in grokdeclarator. */
876 else if (!processing_template_decl)
878 if (TREE_CODE (init) == CONSTRUCTOR)
879 init = digest_init (TREE_TYPE (value), init);
881 init = integral_constant_value (init);
883 if (init != error_mark_node && !TREE_CONSTANT (init))
885 /* We can allow references to things that are effectively
886 static, since references are initialized with the
888 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
889 || (TREE_STATIC (init) == 0
890 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
892 error ("field initializer is not constant");
893 init = error_mark_node;
899 if (processing_template_decl
900 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
902 value = push_template_decl (value);
903 if (error_operand_p (value))
904 return error_mark_node;
908 cplus_decl_attributes (&value, attrlist, 0);
910 switch (TREE_CODE (value))
913 finish_static_data_member_decl (value, init, init_const_expr_p,
914 asmspec_tree, flags);
919 error ("%<asm%> specifiers are not permitted on non-static data members");
920 if (DECL_INITIAL (value) == error_mark_node)
921 init = error_mark_node;
922 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
924 DECL_INITIAL (value) = init;
925 DECL_IN_AGGR_P (value) = 1;
930 set_user_assembler_name (value, asmspec);
932 cp_finish_decl (value,
934 /*init_const_expr_p=*/false,
935 asmspec_tree, flags);
937 /* Pass friends back this way. */
938 if (DECL_FRIEND_P (value))
939 return void_type_node;
941 DECL_IN_AGGR_P (value) = 1;
950 /* Like `grokfield', but for bitfields.
951 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
954 grokbitfield (const cp_declarator *declarator,
955 cp_decl_specifier_seq *declspecs, tree width,
958 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
960 if (value == error_mark_node)
961 return NULL_TREE; /* friends went bad. */
963 /* Pass friendly classes back. */
964 if (TREE_CODE (value) == VOID_TYPE)
965 return void_type_node;
967 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
968 && (POINTER_TYPE_P (value)
969 || !dependent_type_p (TREE_TYPE (value))))
971 error ("bit-field %qD with non-integral type", value);
972 return error_mark_node;
975 if (TREE_CODE (value) == TYPE_DECL)
977 error ("cannot declare %qD to be a bit-field type", value);
981 /* Usually, finish_struct_1 catches bitfields with invalid types.
982 But, in the case of bitfields with function type, we confuse
983 ourselves into thinking they are member functions, so we must
985 if (TREE_CODE (value) == FUNCTION_DECL)
987 error ("cannot declare bit-field %qD with function type",
992 if (DECL_IN_AGGR_P (value))
994 error ("%qD is already defined in the class %qT", value,
995 DECL_CONTEXT (value));
996 return void_type_node;
999 if (TREE_STATIC (value))
1001 error ("static member %qD cannot be a bit-field", value);
1004 finish_decl (value, NULL_TREE, NULL_TREE);
1006 if (width != error_mark_node)
1008 constant_expression_warning (width);
1009 DECL_INITIAL (value) = width;
1010 SET_DECL_C_BIT_FIELD (value);
1013 DECL_IN_AGGR_P (value) = 1;
1016 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1022 /* Returns true iff ATTR is an attribute which needs to be applied at
1023 instantiation time rather than template definition time. */
1026 is_late_template_attribute (tree attr, tree decl)
1028 tree name = TREE_PURPOSE (attr);
1029 tree args = TREE_VALUE (attr);
1030 const struct attribute_spec *spec = lookup_attribute_spec (name);
1034 /* Unknown attribute. */
1037 /* Attribute weak handling wants to write out assembly right away. */
1038 if (is_attribute_p ("weak", name))
1041 /* If any of the arguments are dependent expressions, we can't evaluate
1042 the attribute until instantiation time. */
1043 for (arg = args; arg; arg = TREE_CHAIN (arg))
1045 tree t = TREE_VALUE (arg);
1047 /* If the first attribute argument is an identifier, only consider
1048 second and following arguments. Attributes like mode, format,
1049 cleanup and several target specific attributes aren't late
1050 just because they have an IDENTIFIER_NODE as first argument. */
1051 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1054 if (value_dependent_expression_p (t)
1055 || type_dependent_expression_p (t))
1059 if (TREE_CODE (decl) == TYPE_DECL
1061 || spec->type_required)
1063 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1065 /* We can't apply any attributes to a completely unknown type until
1066 instantiation time. */
1067 enum tree_code code = TREE_CODE (type);
1068 if (code == TEMPLATE_TYPE_PARM
1069 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1070 || code == TYPENAME_TYPE)
1072 /* Also defer most attributes on dependent types. This is not
1073 necessary in all cases, but is the better default. */
1074 else if (dependent_type_p (type)
1075 /* But attribute visibility specifically works on
1077 && !is_attribute_p ("visibility", name))
1086 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1087 applied at instantiation time and return them. If IS_DEPENDENT is true,
1088 the declaration itself is dependent, so all attributes should be applied
1089 at instantiation time. */
1092 splice_template_attributes (tree *attr_p, tree decl)
1095 tree late_attrs = NULL_TREE;
1096 tree *q = &late_attrs;
1103 if (is_late_template_attribute (*p, decl))
1105 ATTR_IS_DEPENDENT (*p) = 1;
1107 *p = TREE_CHAIN (*p);
1108 q = &TREE_CHAIN (*q);
1112 p = &TREE_CHAIN (*p);
1118 /* Remove any late attributes from the list in ATTR_P and attach them to
1122 save_template_attributes (tree *attr_p, tree *decl_p)
1124 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1126 tree old_attrs = NULL_TREE;
1131 if (DECL_P (*decl_p))
1132 q = &DECL_ATTRIBUTES (*decl_p);
1134 q = &TYPE_ATTRIBUTES (*decl_p);
1138 /* Place the late attributes at the beginning of the attribute
1140 TREE_CHAIN (tree_last (late_attrs)) = *q;
1143 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1145 /* We've added new attributes directly to the main variant, so
1146 now we need to update all of the other variants to include
1147 these new attributes. */
1149 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1150 variant = TYPE_NEXT_VARIANT (variant))
1152 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1153 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1158 /* Like reconstruct_complex_type, but handle also template trees. */
1161 cp_reconstruct_complex_type (tree type, tree bottom)
1165 if (TREE_CODE (type) == POINTER_TYPE)
1167 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1168 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1169 TYPE_REF_CAN_ALIAS_ALL (type));
1171 else if (TREE_CODE (type) == REFERENCE_TYPE)
1173 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1174 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1175 TYPE_REF_CAN_ALIAS_ALL (type));
1177 else if (TREE_CODE (type) == ARRAY_TYPE)
1179 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1180 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1181 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1182 element type qualification will be handled by the recursive
1183 cp_reconstruct_complex_type call and cp_build_qualified_type
1184 for ARRAY_TYPEs changes the element type. */
1187 else if (TREE_CODE (type) == FUNCTION_TYPE)
1189 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1190 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1192 else if (TREE_CODE (type) == METHOD_TYPE)
1194 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1195 /* The build_method_type_directly() routine prepends 'this' to argument list,
1196 so we must compensate by getting rid of it. */
1198 = build_method_type_directly
1199 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1201 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1203 else if (TREE_CODE (type) == OFFSET_TYPE)
1205 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1206 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1211 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1214 /* Like decl_attributes, but handle C++ complexity. */
1217 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1219 if (*decl == NULL_TREE || *decl == void_type_node
1220 || *decl == error_mark_node
1221 || attributes == NULL_TREE)
1224 if (processing_template_decl)
1226 if (check_for_bare_parameter_packs (attributes))
1229 save_template_attributes (&attributes, decl);
1230 if (attributes == NULL_TREE)
1234 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1235 decl = &DECL_TEMPLATE_RESULT (*decl);
1237 decl_attributes (decl, attributes, flags);
1239 if (TREE_CODE (*decl) == TYPE_DECL)
1240 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1243 /* Walks through the namespace- or function-scope anonymous union
1244 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1245 Returns one of the fields for use in the mangled name. */
1248 build_anon_union_vars (tree type, tree object)
1250 tree main_decl = NULL_TREE;
1253 /* Rather than write the code to handle the non-union case,
1254 just give an error. */
1255 if (TREE_CODE (type) != UNION_TYPE)
1256 error ("anonymous struct not inside named type");
1258 for (field = TYPE_FIELDS (type);
1260 field = TREE_CHAIN (field))
1265 if (DECL_ARTIFICIAL (field))
1267 if (TREE_CODE (field) != FIELD_DECL)
1269 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1270 "have non-static data members", field);
1274 if (TREE_PRIVATE (field))
1275 permerror (input_location, "private member %q+#D in anonymous union", field);
1276 else if (TREE_PROTECTED (field))
1277 permerror (input_location, "protected member %q+#D in anonymous union", field);
1279 if (processing_template_decl)
1280 ref = build_min_nt (COMPONENT_REF, object,
1281 DECL_NAME (field), NULL_TREE);
1283 ref = build_class_member_access_expr (object, field, NULL_TREE,
1284 false, tf_warning_or_error);
1286 if (DECL_NAME (field))
1290 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1291 DECL_ANON_UNION_VAR_P (decl) = 1;
1293 base = get_base_address (object);
1294 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1295 TREE_STATIC (decl) = TREE_STATIC (base);
1296 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1298 SET_DECL_VALUE_EXPR (decl, ref);
1299 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1301 decl = pushdecl (decl);
1303 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1304 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1308 if (main_decl == NULL_TREE)
1315 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1316 anonymous union, then all members must be laid out together. PUBLIC_P
1317 is nonzero if this union is not declared static. */
1320 finish_anon_union (tree anon_union_decl)
1326 if (anon_union_decl == error_mark_node)
1329 type = TREE_TYPE (anon_union_decl);
1330 public_p = TREE_PUBLIC (anon_union_decl);
1332 /* The VAR_DECL's context is the same as the TYPE's context. */
1333 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1335 if (TYPE_FIELDS (type) == NULL_TREE)
1340 error ("namespace-scope anonymous aggregates must be static");
1344 main_decl = build_anon_union_vars (type, anon_union_decl);
1345 if (main_decl == error_mark_node)
1347 if (main_decl == NULL_TREE)
1349 warning (0, "anonymous union with no members");
1353 if (!processing_template_decl)
1355 /* Use main_decl to set the mangled name. */
1356 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1357 mangle_decl (anon_union_decl);
1358 DECL_NAME (anon_union_decl) = NULL_TREE;
1361 pushdecl (anon_union_decl);
1362 if (building_stmt_tree ()
1363 && at_function_scope_p ())
1364 add_decl_expr (anon_union_decl);
1365 else if (!processing_template_decl)
1366 rest_of_decl_compilation (anon_union_decl,
1367 toplevel_bindings_p (), at_eof);
1370 /* Auxiliary functions to make type signatures for
1371 `operator new' and `operator delete' correspond to
1372 what compiler will be expecting. */
1375 coerce_new_type (tree type)
1378 tree args = TYPE_ARG_TYPES (type);
1380 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1382 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1385 error ("%<operator new%> must return type %qT", ptr_type_node);
1388 if (args && args != void_list_node)
1390 if (TREE_PURPOSE (args))
1392 /* [basic.stc.dynamic.allocation]
1394 The first parameter shall not have an associated default
1396 error ("the first parameter of %<operator new%> cannot "
1397 "have a default argument");
1398 /* Throw away the default argument. */
1399 TREE_PURPOSE (args) = NULL_TREE;
1402 if (!same_type_p (TREE_VALUE (args), size_type_node))
1405 args = TREE_CHAIN (args);
1412 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1413 "as first parameter", size_type_node);
1418 args = tree_cons (NULL_TREE, size_type_node, args);
1421 type = build_exception_variant
1422 (build_function_type (ptr_type_node, args),
1423 TYPE_RAISES_EXCEPTIONS (type));
1431 coerce_delete_type (tree type)
1434 tree args = TYPE_ARG_TYPES (type);
1436 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1438 if (!same_type_p (TREE_TYPE (type), void_type_node))
1441 error ("%<operator delete%> must return type %qT", void_type_node);
1444 if (!args || args == void_list_node
1445 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1448 if (args && args != void_list_node)
1449 args = TREE_CHAIN (args);
1450 error ("%<operator delete%> takes type %qT as first parameter",
1456 args = tree_cons (NULL_TREE, ptr_type_node, args);
1459 type = build_exception_variant
1460 (build_function_type (void_type_node, args),
1461 TYPE_RAISES_EXCEPTIONS (type));
1469 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1470 and mark them as needed. */
1473 mark_vtable_entries (tree decl)
1476 unsigned HOST_WIDE_INT idx;
1478 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1483 STRIP_NOPS (fnaddr);
1485 if (TREE_CODE (fnaddr) != ADDR_EXPR
1486 && TREE_CODE (fnaddr) != FDESC_EXPR)
1487 /* This entry is an offset: a virtual base class offset, a
1488 virtual call offset, an RTTI offset, etc. */
1491 fn = TREE_OPERAND (fnaddr, 0);
1492 TREE_ADDRESSABLE (fn) = 1;
1493 /* When we don't have vcall offsets, we output thunks whenever
1494 we output the vtables that contain them. With vcall offsets,
1495 we know all the thunks we'll need when we emit a virtual
1496 function, so we emit the thunks there instead. */
1497 if (DECL_THUNK_P (fn))
1498 use_thunk (fn, /*emit_p=*/0);
1503 /* Set DECL up to have the closest approximation of "initialized common"
1504 linkage available. */
1507 comdat_linkage (tree decl)
1510 make_decl_one_only (decl);
1511 else if (TREE_CODE (decl) == FUNCTION_DECL
1512 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1513 /* We can just emit function and compiler-generated variables
1514 statically; having multiple copies is (for the most part) only
1517 There are two correctness issues, however: the address of a
1518 template instantiation with external linkage should be the
1519 same, independent of what translation unit asks for the
1520 address, and this will not hold when we emit multiple copies of
1521 the function. However, there's little else we can do.
1523 Also, by default, the typeinfo implementation assumes that
1524 there will be only one copy of the string used as the name for
1525 each type. Therefore, if weak symbols are unavailable, the
1526 run-time library should perform a more conservative check; it
1527 should perform a string comparison, rather than an address
1529 TREE_PUBLIC (decl) = 0;
1532 /* Static data member template instantiations, however, cannot
1533 have multiple copies. */
1534 if (DECL_INITIAL (decl) == 0
1535 || DECL_INITIAL (decl) == error_mark_node)
1536 DECL_COMMON (decl) = 1;
1537 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1539 DECL_COMMON (decl) = 1;
1540 DECL_INITIAL (decl) = error_mark_node;
1542 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1544 /* We can't do anything useful; leave vars for explicit
1546 DECL_EXTERNAL (decl) = 1;
1547 DECL_NOT_REALLY_EXTERN (decl) = 0;
1551 if (DECL_LANG_SPECIFIC (decl))
1552 DECL_COMDAT (decl) = 1;
1555 /* For win32 we also want to put explicit instantiations in
1556 linkonce sections, so that they will be merged with implicit
1557 instantiations; otherwise we get duplicate symbol errors.
1558 For Darwin we do not want explicit instantiations to be
1562 maybe_make_one_only (tree decl)
1564 /* We used to say that this was not necessary on targets that support weak
1565 symbols, because the implicit instantiations will defer to the explicit
1566 one. However, that's not actually the case in SVR4; a strong definition
1567 after a weak one is an error. Also, not making explicit
1568 instantiations one_only means that we can end up with two copies of
1569 some template instantiations. */
1573 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1574 we can get away with not emitting them if they aren't used. We need
1575 to for variables so that cp_finish_decl will update their linkage,
1576 because their DECL_INITIAL may not have been set properly yet. */
1578 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1579 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1580 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1582 make_decl_one_only (decl);
1584 if (TREE_CODE (decl) == VAR_DECL)
1586 DECL_COMDAT (decl) = 1;
1587 /* Mark it needed so we don't forget to emit it. */
1588 mark_decl_referenced (decl);
1593 /* Determine whether or not we want to specifically import or export CTYPE,
1594 using various heuristics. */
1597 import_export_class (tree ctype)
1599 /* -1 for imported, 1 for exported. */
1600 int import_export = 0;
1602 /* It only makes sense to call this function at EOF. The reason is
1603 that this function looks at whether or not the first non-inline
1604 non-abstract virtual member function has been defined in this
1605 translation unit. But, we can't possibly know that until we've
1606 seen the entire translation unit. */
1607 gcc_assert (at_eof);
1609 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1612 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1613 we will have CLASSTYPE_INTERFACE_ONLY set but not
1614 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1615 heuristic because someone will supply a #pragma implementation
1616 elsewhere, and deducing it here would produce a conflict. */
1617 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1620 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1622 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1624 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1625 && !flag_implicit_templates)
1626 /* For a template class, without -fimplicit-templates, check the
1627 repository. If the virtual table is assigned to this
1628 translation unit, then export the class; otherwise, import
1630 import_export = repo_export_class_p (ctype) ? 1 : -1;
1631 else if (TYPE_POLYMORPHIC_P (ctype))
1633 /* The ABI specifies that the virtual table and associated
1634 information are emitted with the key method, if any. */
1635 tree method = CLASSTYPE_KEY_METHOD (ctype);
1636 /* If weak symbol support is not available, then we must be
1637 careful not to emit the vtable when the key function is
1638 inline. An inline function can be defined in multiple
1639 translation units. If we were to emit the vtable in each
1640 translation unit containing a definition, we would get
1641 multiple definition errors at link-time. */
1642 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1643 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1646 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1647 a definition anywhere else. */
1648 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1651 /* Allow back ends the chance to overrule the decision. */
1652 if (targetm.cxx.import_export_class)
1653 import_export = targetm.cxx.import_export_class (ctype, import_export);
1657 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1658 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1662 /* Return true if VAR has already been provided to the back end; in that
1663 case VAR should not be modified further by the front end. */
1665 var_finalized_p (tree var)
1667 return varpool_node (var)->finalized;
1670 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1671 must be emitted in this translation unit. Mark it as such. */
1674 mark_needed (tree decl)
1676 /* It's possible that we no longer need to set
1677 TREE_SYMBOL_REFERENCED here directly, but doing so is
1679 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1680 mark_decl_referenced (decl);
1683 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1684 returns true if a definition of this entity should be provided in
1685 this object file. Callers use this function to determine whether
1686 or not to let the back end know that a definition of DECL is
1687 available in this translation unit. */
1690 decl_needed_p (tree decl)
1692 gcc_assert (TREE_CODE (decl) == VAR_DECL
1693 || TREE_CODE (decl) == FUNCTION_DECL);
1694 /* This function should only be called at the end of the translation
1695 unit. We cannot be sure of whether or not something will be
1696 COMDAT until that point. */
1697 gcc_assert (at_eof);
1699 /* All entities with external linkage that are not COMDAT should be
1700 emitted; they may be referred to from other object files. */
1701 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1703 /* If this entity was used, let the back end see it; it will decide
1704 whether or not to emit it into the object file. */
1705 if (TREE_USED (decl)
1706 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1707 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1709 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1710 reference to DECL might cause it to be emitted later. */
1714 /* If necessary, write out the vtables for the dynamic class CTYPE.
1715 Returns true if any vtables were emitted. */
1718 maybe_emit_vtables (tree ctype)
1724 /* If the vtables for this class have already been emitted there is
1725 nothing more to do. */
1726 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1727 if (var_finalized_p (primary_vtbl))
1729 /* Ignore dummy vtables made by get_vtable_decl. */
1730 if (TREE_TYPE (primary_vtbl) == void_type_node)
1733 /* On some targets, we cannot determine the key method until the end
1734 of the translation unit -- which is when this function is
1736 if (!targetm.cxx.key_method_may_be_inline ())
1737 determine_key_method (ctype);
1739 /* See if any of the vtables are needed. */
1740 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1742 import_export_decl (vtbl);
1743 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1748 /* If the references to this class' vtables are optimized away,
1749 still emit the appropriate debugging information. See
1751 if (DECL_COMDAT (primary_vtbl)
1752 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1753 note_debug_info_needed (ctype);
1757 /* The ABI requires that we emit all of the vtables if we emit any
1759 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1761 /* Mark entities references from the virtual table as used. */
1762 mark_vtable_entries (vtbl);
1764 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1766 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1768 /* It had better be all done at compile-time. */
1773 DECL_EXTERNAL (vtbl) = 0;
1774 rest_of_decl_compilation (vtbl, 1, 1);
1776 /* Because we're only doing syntax-checking, we'll never end up
1777 actually marking the variable as written. */
1778 if (flag_syntax_only)
1779 TREE_ASM_WRITTEN (vtbl) = 1;
1782 /* Since we're writing out the vtable here, also write the debug
1784 note_debug_info_needed (ctype);
1789 /* A special return value from type_visibility meaning internal
1792 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1794 /* walk_tree helper function for type_visibility. */
1797 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1799 int *vis_p = (int *)data;
1804 else if (CLASS_TYPE_P (*tp))
1806 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1808 *vis_p = VISIBILITY_ANON;
1811 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1812 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1817 /* Returns the visibility of TYPE, which is the minimum visibility of its
1821 type_visibility (tree type)
1823 int vis = VISIBILITY_DEFAULT;
1824 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1828 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1829 specified (or if VISIBILITY is static). */
1832 constrain_visibility (tree decl, int visibility)
1834 if (visibility == VISIBILITY_ANON)
1836 /* extern "C" declarations aren't affected by the anonymous
1838 if (!DECL_EXTERN_C_P (decl))
1840 TREE_PUBLIC (decl) = 0;
1841 DECL_ONE_ONLY (decl) = 0;
1842 DECL_INTERFACE_KNOWN (decl) = 1;
1843 if (DECL_LANG_SPECIFIC (decl))
1844 DECL_NOT_REALLY_EXTERN (decl) = 1;
1847 else if (visibility > DECL_VISIBILITY (decl)
1848 && !DECL_VISIBILITY_SPECIFIED (decl))
1850 DECL_VISIBILITY (decl) = visibility;
1856 /* Constrain the visibility of DECL based on the visibility of its template
1860 constrain_visibility_for_template (tree decl, tree targs)
1862 /* If this is a template instantiation, check the innermost
1863 template args for visibility constraints. The outer template
1864 args are covered by the class check. */
1865 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1867 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1871 tree arg = TREE_VEC_ELT (args, i-1);
1873 vis = type_visibility (arg);
1874 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1877 if (TREE_CODE (arg) == ADDR_EXPR)
1878 arg = TREE_OPERAND (arg, 0);
1879 if (TREE_CODE (arg) == VAR_DECL
1880 || TREE_CODE (arg) == FUNCTION_DECL)
1882 if (! TREE_PUBLIC (arg))
1883 vis = VISIBILITY_ANON;
1885 vis = DECL_VISIBILITY (arg);
1889 constrain_visibility (decl, vis);
1893 /* Like c_determine_visibility, but with additional C++-specific
1896 Function-scope entities can rely on the function's visibility because
1897 it is set in start_preparsed_function.
1899 Class-scope entities cannot rely on the class's visibility until the end
1900 of the enclosing class definition.
1902 Note that because namespaces have multiple independent definitions,
1903 namespace visibility is handled elsewhere using the #pragma visibility
1904 machinery rather than by decorating the namespace declaration.
1906 The goal is for constraints from the type to give a diagnostic, and
1907 other constraints to be applied silently. */
1910 determine_visibility (tree decl)
1912 tree class_type = NULL_TREE;
1915 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1917 /* Only relevant for names with external linkage. */
1918 if (!TREE_PUBLIC (decl))
1921 /* Cloned constructors and destructors get the same visibility as
1922 the underlying function. That should be set up in
1923 maybe_clone_body. */
1924 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1926 if (TREE_CODE (decl) == TYPE_DECL)
1928 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1929 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1930 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1935 else if (DECL_LANG_SPECIFIC (decl))
1936 use_template = DECL_USE_TEMPLATE (decl);
1940 /* If DECL is a member of a class, visibility specifiers on the
1941 class can influence the visibility of the DECL. */
1942 if (DECL_CLASS_SCOPE_P (decl))
1943 class_type = DECL_CONTEXT (decl);
1946 /* Not a class member. */
1948 /* Virtual tables have DECL_CONTEXT set to their associated class,
1949 so they are automatically handled above. */
1950 gcc_assert (TREE_CODE (decl) != VAR_DECL
1951 || !DECL_VTABLE_OR_VTT_P (decl));
1953 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1955 /* Local statics and classes get the visibility of their
1956 containing function by default, except that
1957 -fvisibility-inlines-hidden doesn't affect them. */
1958 tree fn = DECL_CONTEXT (decl);
1959 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1961 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1962 DECL_VISIBILITY_SPECIFIED (decl) =
1963 DECL_VISIBILITY_SPECIFIED (fn);
1966 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1968 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1969 but have no TEMPLATE_INFO, so don't try to check it. */
1972 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1973 && flag_visibility_ms_compat)
1975 /* Under -fvisibility-ms-compat, types are visible by default,
1976 even though their contents aren't. */
1977 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1978 int underlying_vis = type_visibility (underlying_type);
1979 if (underlying_vis == VISIBILITY_ANON
1980 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1981 constrain_visibility (decl, underlying_vis);
1983 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1985 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1987 /* tinfo visibility is based on the type it's for. */
1988 constrain_visibility
1989 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1991 /* Give the target a chance to override the visibility associated
1993 if (TREE_PUBLIC (decl)
1994 && !DECL_REALLY_EXTERN (decl)
1995 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
1996 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
1997 targetm.cxx.determine_class_data_visibility (decl);
1999 else if (use_template)
2000 /* Template instantiations and specializations get visibility based
2001 on their template unless they override it with an attribute. */;
2002 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2004 /* Set default visibility to whatever the user supplied with
2005 #pragma GCC visibility or a namespace visibility attribute. */
2006 DECL_VISIBILITY (decl) = default_visibility;
2007 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2013 /* If the specialization doesn't specify visibility, use the
2014 visibility from the template. */
2015 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2016 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2017 : DECL_TEMPLATE_INFO (decl));
2018 tree args = TI_ARGS (tinfo);
2020 if (args != error_mark_node)
2022 int depth = TMPL_ARGS_DEPTH (args);
2023 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2025 if (!DECL_VISIBILITY_SPECIFIED (decl))
2027 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2028 DECL_VISIBILITY_SPECIFIED (decl)
2029 = DECL_VISIBILITY_SPECIFIED (pattern);
2032 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2033 if (args && depth > template_class_depth (class_type))
2034 /* Limit visibility based on its template arguments. */
2035 constrain_visibility_for_template (decl, args);
2040 determine_visibility_from_class (decl, class_type);
2042 if (decl_anon_ns_mem_p (decl))
2043 /* Names in an anonymous namespace get internal linkage.
2044 This might change once we implement export. */
2045 constrain_visibility (decl, VISIBILITY_ANON);
2046 else if (TREE_CODE (decl) != TYPE_DECL)
2048 /* Propagate anonymity from type to decl. */
2049 int tvis = type_visibility (TREE_TYPE (decl));
2050 if (tvis == VISIBILITY_ANON
2051 || ! DECL_VISIBILITY_SPECIFIED (decl))
2052 constrain_visibility (decl, tvis);
2056 /* By default, static data members and function members receive
2057 the visibility of their containing class. */
2060 determine_visibility_from_class (tree decl, tree class_type)
2062 if (DECL_VISIBILITY_SPECIFIED (decl))
2065 if (visibility_options.inlines_hidden
2066 /* Don't do this for inline templates; specializations might not be
2067 inline, and we don't want them to inherit the hidden
2068 visibility. We'll set it here for all inline instantiations. */
2069 && !processing_template_decl
2070 && TREE_CODE (decl) == FUNCTION_DECL
2071 && DECL_DECLARED_INLINE_P (decl)
2072 && (! DECL_LANG_SPECIFIC (decl)
2073 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2074 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2077 /* Default to the class visibility. */
2078 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2079 DECL_VISIBILITY_SPECIFIED (decl)
2080 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2083 /* Give the target a chance to override the visibility associated
2085 if (TREE_CODE (decl) == VAR_DECL
2086 && (DECL_TINFO_P (decl)
2087 || (DECL_VTABLE_OR_VTT_P (decl)
2088 /* Construction virtual tables are not exported because
2089 they cannot be referred to from other object files;
2090 their name is not standardized by the ABI. */
2091 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2092 && TREE_PUBLIC (decl)
2093 && !DECL_REALLY_EXTERN (decl)
2094 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2095 targetm.cxx.determine_class_data_visibility (decl);
2098 /* Constrain the visibility of a class TYPE based on the visibility of its
2099 field types. Warn if any fields require lesser visibility. */
2102 constrain_class_visibility (tree type)
2108 int vis = type_visibility (type);
2110 if (vis == VISIBILITY_ANON
2111 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2114 /* Don't warn about visibility if the class has explicit visibility. */
2115 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2116 vis = VISIBILITY_INTERNAL;
2118 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2119 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2121 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2122 int subvis = type_visibility (ftype);
2124 if (subvis == VISIBILITY_ANON)
2126 if (!in_main_input_context ())
2128 %qT has a field %qD whose type uses the anonymous namespace",
2131 else if (MAYBE_CLASS_TYPE_P (ftype)
2132 && vis < VISIBILITY_HIDDEN
2133 && subvis >= VISIBILITY_HIDDEN)
2134 warning (OPT_Wattributes, "\
2135 %qT declared with greater visibility than the type of its field %qD",
2139 binfo = TYPE_BINFO (type);
2140 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2142 int subvis = type_visibility (TREE_TYPE (t));
2144 if (subvis == VISIBILITY_ANON)
2146 if (!in_main_input_context())
2148 %qT has a base %qT whose type uses the anonymous namespace",
2149 type, TREE_TYPE (t));
2151 else if (vis < VISIBILITY_HIDDEN
2152 && subvis >= VISIBILITY_HIDDEN)
2153 warning (OPT_Wattributes, "\
2154 %qT declared with greater visibility than its base %qT",
2155 type, TREE_TYPE (t));
2159 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2160 for DECL has not already been determined, do so now by setting
2161 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2162 function is called entities with vague linkage whose definitions
2163 are available must have TREE_PUBLIC set.
2165 If this function decides to place DECL in COMDAT, it will set
2166 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2167 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2168 callers defer that decision until it is clear that DECL is actually
2172 import_export_decl (tree decl)
2177 tree class_type = NULL_TREE;
2179 if (DECL_INTERFACE_KNOWN (decl))
2182 /* We cannot determine what linkage to give to an entity with vague
2183 linkage until the end of the file. For example, a virtual table
2184 for a class will be defined if and only if the key method is
2185 defined in this translation unit. As a further example, consider
2186 that when compiling a translation unit that uses PCH file with
2187 "-frepo" it would be incorrect to make decisions about what
2188 entities to emit when building the PCH; those decisions must be
2189 delayed until the repository information has been processed. */
2190 gcc_assert (at_eof);
2191 /* Object file linkage for explicit instantiations is handled in
2192 mark_decl_instantiated. For static variables in functions with
2193 vague linkage, maybe_commonize_var is used.
2195 Therefore, the only declarations that should be provided to this
2196 function are those with external linkage that are:
2198 * implicit instantiations of function templates
2202 * implicit instantiations of static data members of class
2209 Furthermore, all entities that reach this point must have a
2210 definition available in this translation unit.
2212 The following assertions check these conditions. */
2213 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2214 || TREE_CODE (decl) == VAR_DECL);
2215 /* Any code that creates entities with TREE_PUBLIC cleared should
2216 also set DECL_INTERFACE_KNOWN. */
2217 gcc_assert (TREE_PUBLIC (decl));
2218 if (TREE_CODE (decl) == FUNCTION_DECL)
2219 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2220 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2221 || DECL_DECLARED_INLINE_P (decl));
2223 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2224 || DECL_VTABLE_OR_VTT_P (decl)
2225 || DECL_TINFO_P (decl));
2226 /* Check that a definition of DECL is available in this translation
2228 gcc_assert (!DECL_REALLY_EXTERN (decl));
2230 /* Assume that DECL will not have COMDAT linkage. */
2232 /* Assume that DECL will not be imported into this translation
2236 /* See if the repository tells us whether or not to emit DECL in
2237 this translation unit. */
2238 emit_p = repo_emit_p (decl);
2241 else if (emit_p == 1)
2243 /* The repository indicates that this entity should be defined
2244 here. Make sure the back end honors that request. */
2245 if (TREE_CODE (decl) == VAR_DECL)
2247 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2248 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2251 FOR_EACH_CLONE (clone, decl)
2252 mark_needed (clone);
2256 /* Output the definition as an ordinary strong definition. */
2257 DECL_EXTERNAL (decl) = 0;
2258 DECL_INTERFACE_KNOWN (decl) = 1;
2263 /* We have already decided what to do with this DECL; there is no
2264 need to check anything further. */
2266 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2268 class_type = DECL_CONTEXT (decl);
2269 import_export_class (class_type);
2270 if (TYPE_FOR_JAVA (class_type))
2272 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2273 && CLASSTYPE_INTERFACE_ONLY (class_type))
2275 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2276 && !CLASSTYPE_USE_TEMPLATE (class_type)
2277 && CLASSTYPE_KEY_METHOD (class_type)
2278 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2279 /* The ABI requires that all virtual tables be emitted with
2280 COMDAT linkage. However, on systems where COMDAT symbols
2281 don't show up in the table of contents for a static
2282 archive, or on systems without weak symbols (where we
2283 approximate COMDAT linkage by using internal linkage), the
2284 linker will report errors about undefined symbols because
2285 it will not see the virtual table definition. Therefore,
2286 in the case that we know that the virtual table will be
2287 emitted in only one translation unit, we make the virtual
2288 table an ordinary definition with external linkage. */
2289 DECL_EXTERNAL (decl) = 0;
2290 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2292 /* CLASS_TYPE is being exported from this translation unit,
2293 so DECL should be defined here. */
2294 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2295 /* If a class is declared in a header with the "extern
2296 template" extension, then it will not be instantiated,
2297 even in translation units that would normally require
2298 it. Often such classes are explicitly instantiated in
2299 one translation unit. Therefore, the explicit
2300 instantiation must be made visible to other translation
2302 DECL_EXTERNAL (decl) = 0;
2305 /* The generic C++ ABI says that class data is always
2306 COMDAT, even if there is a key function. Some
2307 variants (e.g., the ARM EABI) says that class data
2308 only has COMDAT linkage if the class data might be
2309 emitted in more than one translation unit. When the
2310 key method can be inline and is inline, we still have
2311 to arrange for comdat even though
2312 class_data_always_comdat is false. */
2313 if (!CLASSTYPE_KEY_METHOD (class_type)
2314 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2315 || targetm.cxx.class_data_always_comdat ())
2317 /* The ABI requires COMDAT linkage. Normally, we
2318 only emit COMDAT things when they are needed;
2319 make sure that we realize that this entity is
2326 else if (!flag_implicit_templates
2327 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2332 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2334 tree type = TREE_TYPE (DECL_NAME (decl));
2335 if (CLASS_TYPE_P (type))
2338 import_export_class (type);
2339 if (CLASSTYPE_INTERFACE_KNOWN (type)
2340 && TYPE_POLYMORPHIC_P (type)
2341 && CLASSTYPE_INTERFACE_ONLY (type)
2342 /* If -fno-rtti was specified, then we cannot be sure
2343 that RTTI information will be emitted with the
2344 virtual table of the class, so we must emit it
2345 wherever it is used. */
2350 if (CLASSTYPE_INTERFACE_KNOWN (type)
2351 && !CLASSTYPE_INTERFACE_ONLY (type))
2353 comdat_p = (targetm.cxx.class_data_always_comdat ()
2354 || (CLASSTYPE_KEY_METHOD (type)
2355 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2360 DECL_EXTERNAL (decl) = 0;
2370 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2371 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2373 /* DECL is an implicit instantiation of a function or static
2375 if ((flag_implicit_templates
2376 && !flag_use_repository)
2377 || (flag_implicit_inline_templates
2378 && TREE_CODE (decl) == FUNCTION_DECL
2379 && DECL_DECLARED_INLINE_P (decl)))
2382 /* If we are not implicitly generating templates, then mark
2383 this entity as undefined in this translation unit. */
2386 else if (DECL_FUNCTION_MEMBER_P (decl))
2388 if (!DECL_DECLARED_INLINE_P (decl))
2390 tree ctype = DECL_CONTEXT (decl);
2391 import_export_class (ctype);
2392 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2394 DECL_NOT_REALLY_EXTERN (decl)
2395 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2396 || (DECL_DECLARED_INLINE_P (decl)
2397 && ! flag_implement_inlines
2398 && !DECL_VINDEX (decl)));
2400 if (!DECL_NOT_REALLY_EXTERN (decl))
2401 DECL_EXTERNAL (decl) = 1;
2403 /* Always make artificials weak. */
2404 if (DECL_ARTIFICIAL (decl) && flag_weak)
2407 maybe_make_one_only (decl);
2418 /* If we are importing DECL into this translation unit, mark is
2419 an undefined here. */
2420 DECL_EXTERNAL (decl) = 1;
2421 DECL_NOT_REALLY_EXTERN (decl) = 0;
2425 /* If we decided to put DECL in COMDAT, mark it accordingly at
2427 comdat_linkage (decl);
2430 DECL_INTERFACE_KNOWN (decl) = 1;
2433 /* Return an expression that performs the destruction of DECL, which
2434 must be a VAR_DECL whose type has a non-trivial destructor, or is
2435 an array whose (innermost) elements have a non-trivial destructor. */
2438 build_cleanup (tree decl)
2441 tree type = TREE_TYPE (decl);
2443 /* This function should only be called for declarations that really
2444 require cleanups. */
2445 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2447 /* Treat all objects with destructors as used; the destructor may do
2448 something substantive. */
2451 if (TREE_CODE (type) == ARRAY_TYPE)
2454 temp = build_address (decl);
2455 temp = build_delete (TREE_TYPE (temp), temp,
2456 sfk_complete_destructor,
2457 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2461 /* Returns the initialization guard variable for the variable DECL,
2462 which has static storage duration. */
2465 get_guard (tree decl)
2470 sname = mangle_guard_variable (decl);
2471 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2476 /* We use a type that is big enough to contain a mutex as well
2477 as an integer counter. */
2478 guard_type = targetm.cxx.guard_type ();
2479 guard = build_decl (VAR_DECL, sname, guard_type);
2481 /* The guard should have the same linkage as what it guards. */
2482 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2483 TREE_STATIC (guard) = TREE_STATIC (decl);
2484 DECL_COMMON (guard) = DECL_COMMON (decl);
2485 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2486 if (TREE_PUBLIC (decl))
2487 DECL_WEAK (guard) = DECL_WEAK (decl);
2488 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2489 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2491 DECL_ARTIFICIAL (guard) = 1;
2492 DECL_IGNORED_P (guard) = 1;
2493 TREE_USED (guard) = 1;
2494 pushdecl_top_level_and_finish (guard, NULL_TREE);
2499 /* Return those bits of the GUARD variable that should be set when the
2500 guarded entity is actually initialized. */
2503 get_guard_bits (tree guard)
2505 if (!targetm.cxx.guard_mask_bit ())
2507 /* We only set the first byte of the guard, in order to leave room
2508 for a mutex in the high-order bits. */
2509 guard = build1 (ADDR_EXPR,
2510 build_pointer_type (TREE_TYPE (guard)),
2512 guard = build1 (NOP_EXPR,
2513 build_pointer_type (char_type_node),
2515 guard = build1 (INDIRECT_REF, char_type_node, guard);
2521 /* Return an expression which determines whether or not the GUARD
2522 variable has already been initialized. */
2525 get_guard_cond (tree guard)
2529 /* Check to see if the GUARD is zero. */
2530 guard = get_guard_bits (guard);
2532 /* Mask off all but the low bit. */
2533 if (targetm.cxx.guard_mask_bit ())
2535 guard_value = integer_one_node;
2536 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2537 guard_value = convert (TREE_TYPE (guard), guard_value);
2538 guard = cp_build_binary_op (input_location,
2539 BIT_AND_EXPR, guard, guard_value,
2540 tf_warning_or_error);
2543 guard_value = integer_zero_node;
2544 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2545 guard_value = convert (TREE_TYPE (guard), guard_value);
2546 return cp_build_binary_op (input_location,
2547 EQ_EXPR, guard, guard_value,
2548 tf_warning_or_error);
2551 /* Return an expression which sets the GUARD variable, indicating that
2552 the variable being guarded has been initialized. */
2555 set_guard (tree guard)
2559 /* Set the GUARD to one. */
2560 guard = get_guard_bits (guard);
2561 guard_init = integer_one_node;
2562 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2563 guard_init = convert (TREE_TYPE (guard), guard_init);
2564 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2565 tf_warning_or_error);
2568 /* Start the process of running a particular set of global constructors
2569 or destructors. Subroutine of do_[cd]tors. */
2572 start_objects (int method_type, int initp)
2578 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2580 if (initp != DEFAULT_INIT_PRIORITY)
2590 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2593 sprintf (type, "%c", method_type);
2595 fndecl = build_lang_decl (FUNCTION_DECL,
2596 get_file_function_name (type),
2597 build_function_type (void_type_node,
2599 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2601 TREE_PUBLIC (current_function_decl) = 0;
2603 /* Mark as artificial because it's not explicitly in the user's
2605 DECL_ARTIFICIAL (current_function_decl) = 1;
2607 /* Mark this declaration as used to avoid spurious warnings. */
2608 TREE_USED (current_function_decl) = 1;
2610 /* Mark this function as a global constructor or destructor. */
2611 if (method_type == 'I')
2612 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2614 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2615 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2617 body = begin_compound_stmt (BCS_FN_BODY);
2622 /* Finish the process of running a particular set of global constructors
2623 or destructors. Subroutine of do_[cd]tors. */
2626 finish_objects (int method_type, int initp, tree body)
2631 finish_compound_stmt (body);
2632 fn = finish_function (0);
2634 if (method_type == 'I')
2636 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2637 decl_init_priority_insert (fn, initp);
2641 DECL_STATIC_DESTRUCTOR (fn) = 1;
2642 decl_fini_priority_insert (fn, initp);
2645 expand_or_defer_fn (fn);
2648 /* The names of the parameters to the function created to handle
2649 initializations and destructions for objects with static storage
2651 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2652 #define PRIORITY_IDENTIFIER "__priority"
2654 /* The name of the function we create to handle initializations and
2655 destructions for objects with static storage duration. */
2656 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2658 /* The declaration for the __INITIALIZE_P argument. */
2659 static GTY(()) tree initialize_p_decl;
2661 /* The declaration for the __PRIORITY argument. */
2662 static GTY(()) tree priority_decl;
2664 /* The declaration for the static storage duration function. */
2665 static GTY(()) tree ssdf_decl;
2667 /* All the static storage duration functions created in this
2668 translation unit. */
2669 static GTY(()) VEC(tree,gc) *ssdf_decls;
2671 /* A map from priority levels to information about that priority
2672 level. There may be many such levels, so efficient lookup is
2674 static splay_tree priority_info_map;
2676 /* Begins the generation of the function that will handle all
2677 initialization and destruction of objects with static storage
2678 duration. The function generated takes two parameters of type
2679 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2680 nonzero, it performs initializations. Otherwise, it performs
2681 destructions. It only performs those initializations or
2682 destructions with the indicated __PRIORITY. The generated function
2685 It is assumed that this function will only be called once per
2686 translation unit. */
2689 start_static_storage_duration_function (unsigned count)
2694 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2696 /* Create the identifier for this function. It will be of the form
2697 SSDF_IDENTIFIER_<number>. */
2698 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2700 /* Create the parameters. */
2701 parm_types = void_list_node;
2702 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2703 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2704 type = build_function_type (void_type_node, parm_types);
2706 /* Create the FUNCTION_DECL itself. */
2707 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2708 get_identifier (id),
2710 TREE_PUBLIC (ssdf_decl) = 0;
2711 DECL_ARTIFICIAL (ssdf_decl) = 1;
2713 /* Put this function in the list of functions to be called from the
2714 static constructors and destructors. */
2717 ssdf_decls = VEC_alloc (tree, gc, 32);
2719 /* Take this opportunity to initialize the map from priority
2720 numbers to information about that priority level. */
2721 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2722 /*delete_key_fn=*/0,
2723 /*delete_value_fn=*/
2724 (splay_tree_delete_value_fn) &free);
2726 /* We always need to generate functions for the
2727 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2728 priorities later, we'll be sure to find the
2729 DEFAULT_INIT_PRIORITY. */
2730 get_priority_info (DEFAULT_INIT_PRIORITY);
2733 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2735 /* Create the argument list. */
2736 initialize_p_decl = cp_build_parm_decl
2737 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2738 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2739 TREE_USED (initialize_p_decl) = 1;
2740 priority_decl = cp_build_parm_decl
2741 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2742 DECL_CONTEXT (priority_decl) = ssdf_decl;
2743 TREE_USED (priority_decl) = 1;
2745 TREE_CHAIN (initialize_p_decl) = priority_decl;
2746 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2748 /* Put the function in the global scope. */
2749 pushdecl (ssdf_decl);
2751 /* Start the function itself. This is equivalent to declaring the
2754 static void __ssdf (int __initialize_p, init __priority_p);
2756 It is static because we only need to call this function from the
2757 various constructor and destructor functions for this module. */
2758 start_preparsed_function (ssdf_decl,
2759 /*attrs=*/NULL_TREE,
2762 /* Set up the scope of the outermost block in the function. */
2763 body = begin_compound_stmt (BCS_FN_BODY);
2768 /* Finish the generation of the function which performs initialization
2769 and destruction of objects with static storage duration. After
2770 this point, no more such objects can be created. */
2773 finish_static_storage_duration_function (tree body)
2775 /* Close out the function. */
2776 finish_compound_stmt (body);
2777 expand_or_defer_fn (finish_function (0));
2780 /* Return the information about the indicated PRIORITY level. If no
2781 code to handle this level has yet been generated, generate the
2782 appropriate prologue. */
2784 static priority_info
2785 get_priority_info (int priority)
2790 n = splay_tree_lookup (priority_info_map,
2791 (splay_tree_key) priority);
2794 /* Create a new priority information structure, and insert it
2796 pi = XNEW (struct priority_info_s);
2797 pi->initializations_p = 0;
2798 pi->destructions_p = 0;
2799 splay_tree_insert (priority_info_map,
2800 (splay_tree_key) priority,
2801 (splay_tree_value) pi);
2804 pi = (priority_info) n->value;
2809 /* The effective initialization priority of a DECL. */
2811 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2812 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2813 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2815 /* Whether a DECL needs a guard to protect it against multiple
2818 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2819 || DECL_ONE_ONLY (decl) \
2820 || DECL_WEAK (decl)))
2822 /* Called from one_static_initialization_or_destruction(),
2824 Walks the initializer list of a global variable and looks for
2825 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2826 and that have their DECL_CONTEXT() == NULL.
2827 For each such temporary variable, set their DECL_CONTEXT() to
2828 the current function. This is necessary because otherwise
2829 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2830 when trying to refer to a temporary variable that does not have
2831 it's DECL_CONTECT() properly set. */
2833 fix_temporary_vars_context_r (tree *node,
2834 int *unused ATTRIBUTE_UNUSED,
2835 void *unused1 ATTRIBUTE_UNUSED)
2837 gcc_assert (current_function_decl);
2839 if (TREE_CODE (*node) == BIND_EXPR)
2843 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2844 if (TREE_CODE (var) == VAR_DECL
2846 && DECL_ARTIFICIAL (var)
2847 && !DECL_CONTEXT (var))
2848 DECL_CONTEXT (var) = current_function_decl;
2854 /* Set up to handle the initialization or destruction of DECL. If
2855 INITP is nonzero, we are initializing the variable. Otherwise, we
2856 are destroying it. */
2859 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2861 tree guard_if_stmt = NULL_TREE;
2864 /* If we are supposed to destruct and there's a trivial destructor,
2865 nothing has to be done. */
2867 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2870 /* Trick the compiler into thinking we are at the file and line
2871 where DECL was declared so that error-messages make sense, and so
2872 that the debugger will show somewhat sensible file and line
2874 input_location = DECL_SOURCE_LOCATION (decl);
2876 /* Make sure temporary variables in the initialiser all have
2877 their DECL_CONTEXT() set to a value different from NULL_TREE.
2878 This can happen when global variables initialisers are built.
2879 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2880 the temporary variables that might have been generated in the
2881 accompagning initialisers is NULL_TREE, meaning the variables have been
2882 declared in the global namespace.
2883 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2884 of the temporaries are set to the current function decl. */
2885 cp_walk_tree_without_duplicates (&init,
2886 fix_temporary_vars_context_r,
2893 Access control for implicit calls to the constructors,
2894 the conversion functions, or the destructor called to
2895 create and destroy a static data member is performed as
2896 if these calls appeared in the scope of the member's
2899 we pretend we are in a static member function of the class of
2900 which the DECL is a member. */
2901 if (member_p (decl))
2903 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2904 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2907 /* Assume we don't need a guard. */
2909 /* We need a guard if this is an object with external linkage that
2910 might be initialized in more than one place. (For example, a
2911 static data member of a template, when the data member requires
2913 if (NEEDS_GUARD_P (decl))
2917 guard = get_guard (decl);
2919 /* When using __cxa_atexit, we just check the GUARD as we would
2920 for a local static. */
2921 if (flag_use_cxa_atexit)
2923 /* When using __cxa_atexit, we never try to destroy
2924 anything from a static destructor. */
2926 guard_cond = get_guard_cond (guard);
2928 /* If we don't have __cxa_atexit, then we will be running
2929 destructors from .fini sections, or their equivalents. So,
2930 we need to know how many times we've tried to initialize this
2931 object. We do initializations only if the GUARD is zero,
2932 i.e., if we are the first to initialize the variable. We do
2933 destructions only if the GUARD is one, i.e., if we are the
2934 last to destroy the variable. */
2937 = cp_build_binary_op (input_location,
2939 cp_build_unary_op (PREINCREMENT_EXPR,
2942 tf_warning_or_error),
2944 tf_warning_or_error);
2947 = cp_build_binary_op (input_location,
2949 cp_build_unary_op (PREDECREMENT_EXPR,
2952 tf_warning_or_error),
2954 tf_warning_or_error);
2956 guard_if_stmt = begin_if_stmt ();
2957 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2961 /* If we're using __cxa_atexit, we have not already set the GUARD,
2962 so we must do so now. */
2963 if (guard && initp && flag_use_cxa_atexit)
2964 finish_expr_stmt (set_guard (guard));
2966 /* Perform the initialization or destruction. */
2970 finish_expr_stmt (init);
2972 /* If we're using __cxa_atexit, register a function that calls the
2973 destructor for the object. */
2974 if (flag_use_cxa_atexit)
2975 finish_expr_stmt (register_dtor_fn (decl));
2978 finish_expr_stmt (build_cleanup (decl));
2980 /* Finish the guard if-stmt, if necessary. */
2983 finish_then_clause (guard_if_stmt);
2984 finish_if_stmt (guard_if_stmt);
2987 /* Now that we're done with DECL we don't need to pretend to be a
2988 member of its class any longer. */
2989 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2990 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2993 /* Generate code to do the initialization or destruction of the decls in VARS,
2994 a TREE_LIST of VAR_DECL with static storage duration.
2995 Whether initialization or destruction is performed is specified by INITP. */
2998 do_static_initialization_or_destruction (tree vars, bool initp)
3000 tree node, init_if_stmt, cond;
3002 /* Build the outer if-stmt to check for initialization or destruction. */
3003 init_if_stmt = begin_if_stmt ();
3004 cond = initp ? integer_one_node : integer_zero_node;
3005 cond = cp_build_binary_op (input_location,
3009 tf_warning_or_error);
3010 finish_if_stmt_cond (cond, init_if_stmt);
3014 tree decl = TREE_VALUE (node);
3015 tree priority_if_stmt;
3019 /* If we don't need a destructor, there's nothing to do. Avoid
3020 creating a possibly empty if-stmt. */
3021 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3023 node = TREE_CHAIN (node);
3027 /* Remember that we had an initialization or finalization at this
3029 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3030 pi = get_priority_info (priority);
3032 pi->initializations_p = 1;
3034 pi->destructions_p = 1;
3036 /* Conditionalize this initialization on being in the right priority
3037 and being initializing/finalizing appropriately. */
3038 priority_if_stmt = begin_if_stmt ();
3039 cond = cp_build_binary_op (input_location,
3042 build_int_cst (NULL_TREE, priority),
3043 tf_warning_or_error);
3044 finish_if_stmt_cond (cond, priority_if_stmt);
3046 /* Process initializers with same priority. */
3048 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3049 node = TREE_CHAIN (node))
3050 /* Do one initialization or destruction. */
3051 one_static_initialization_or_destruction (TREE_VALUE (node),
3052 TREE_PURPOSE (node), initp);
3054 /* Finish up the priority if-stmt body. */
3055 finish_then_clause (priority_if_stmt);
3056 finish_if_stmt (priority_if_stmt);
3060 /* Finish up the init/destruct if-stmt body. */
3061 finish_then_clause (init_if_stmt);
3062 finish_if_stmt (init_if_stmt);
3065 /* VARS is a list of variables with static storage duration which may
3066 need initialization and/or finalization. Remove those variables
3067 that don't really need to be initialized or finalized, and return
3068 the resulting list. The order in which the variables appear in
3069 VARS is in reverse order of the order in which they should actually
3070 be initialized. The list we return is in the unreversed order;
3071 i.e., the first variable should be initialized first. */
3074 prune_vars_needing_no_initialization (tree *vars)
3077 tree result = NULL_TREE;
3082 tree decl = TREE_VALUE (t);
3083 tree init = TREE_PURPOSE (t);
3085 /* Deal gracefully with error. */
3086 if (decl == error_mark_node)
3088 var = &TREE_CHAIN (t);
3092 /* The only things that can be initialized are variables. */
3093 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3095 /* If this object is not defined, we don't need to do anything
3097 if (DECL_EXTERNAL (decl))
3099 var = &TREE_CHAIN (t);
3103 /* Also, if the initializer already contains errors, we can bail
3105 if (init && TREE_CODE (init) == TREE_LIST
3106 && value_member (error_mark_node, init))
3108 var = &TREE_CHAIN (t);
3112 /* This variable is going to need initialization and/or
3113 finalization, so we add it to the list. */
3114 *var = TREE_CHAIN (t);
3115 TREE_CHAIN (t) = result;
3122 /* Make sure we have told the back end about all the variables in
3126 write_out_vars (tree vars)
3130 for (v = vars; v; v = TREE_CHAIN (v))
3132 tree var = TREE_VALUE (v);
3133 if (!var_finalized_p (var))
3135 import_export_decl (var);
3136 rest_of_decl_compilation (var, 1, 1);
3141 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3142 (otherwise) that will initialize all global objects with static
3143 storage duration having the indicated PRIORITY. */
3146 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3155 input_location = *locus;
3157 /* Was: locus->line++; */
3159 /* We use `I' to indicate initialization and `D' to indicate
3161 function_key = constructor_p ? 'I' : 'D';
3163 /* We emit the function lazily, to avoid generating empty
3164 global constructors and destructors. */
3167 /* For Objective-C++, we may need to initialize metadata found in this module.
3168 This must be done _before_ any other static initializations. */
3169 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3170 && constructor_p && objc_static_init_needed_p ())
3172 body = start_objects (function_key, priority);
3173 objc_generate_static_init_call (NULL_TREE);
3176 /* Call the static storage duration function with appropriate
3178 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3180 /* Calls to pure or const functions will expand to nothing. */
3181 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3184 body = start_objects (function_key, priority);
3186 arguments = tree_cons (NULL_TREE,
3187 build_int_cst (NULL_TREE, priority),
3189 arguments = tree_cons (NULL_TREE,
3190 build_int_cst (NULL_TREE, constructor_p),
3192 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3193 tf_warning_or_error));
3197 /* Close out the function. */
3199 finish_objects (function_key, priority, body);
3202 /* Generate constructor and destructor functions for the priority
3206 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3208 location_t *locus = (location_t *) data;
3209 int priority = (int) n->key;
3210 priority_info pi = (priority_info) n->value;
3212 /* Generate the functions themselves, but only if they are really
3214 if (pi->initializations_p)
3215 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3216 if (pi->destructions_p)
3217 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3219 /* Keep iterating. */
3223 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3224 decls referenced from front-end specific constructs; it will be called
3225 only for language-specific tree nodes.
3227 Here we must deal with member pointers. */
3230 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3234 switch (TREE_CODE (t))
3237 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3238 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3241 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3242 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3245 if (DECL_VTABLE_OR_VTT_P (t))
3247 /* The ABI requires that all virtual tables be emitted
3248 whenever one of them is. */
3250 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3252 vtbl = TREE_CHAIN (vtbl))
3253 mark_decl_referenced (vtbl);
3255 else if (DECL_CONTEXT (t)
3256 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3257 /* If we need a static variable in a function, then we
3258 need the containing function. */
3259 mark_decl_referenced (DECL_CONTEXT (t));
3268 /* Java requires that we be able to reference a local address for a
3269 method, and not be confused by PLT entries. If hidden aliases are
3270 supported, emit one for each java function that we've emitted. */
3273 build_java_method_aliases (void)
3275 struct cgraph_node *node;
3277 #ifndef HAVE_GAS_HIDDEN
3281 for (node = cgraph_nodes; node ; node = node->next)
3283 tree fndecl = node->decl;
3285 if (TREE_ASM_WRITTEN (fndecl)
3286 && DECL_CONTEXT (fndecl)
3287 && TYPE_P (DECL_CONTEXT (fndecl))
3288 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3289 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3291 /* Mangle the name in a predictable way; we need to reference
3292 this from a java compiled object file. */
3293 tree oid, nid, alias;
3297 oid = DECL_ASSEMBLER_NAME (fndecl);
3298 oname = IDENTIFIER_POINTER (oid);
3299 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3300 nname = ACONCAT (("_ZGA", oname+2, NULL));
3301 nid = get_identifier (nname);
3303 alias = make_alias_for (fndecl, nid);
3304 TREE_PUBLIC (alias) = 1;
3305 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3307 assemble_alias (alias, oid);
3312 /* This routine is called at the end of compilation.
3313 Its job is to create all the code needed to initialize and
3314 destroy the global aggregates. We do the destruction
3315 first, since that way we only need to reverse the decls once. */
3318 cp_write_global_declarations (void)
3324 unsigned ssdf_count = 0;
3328 locus = input_location;
3331 /* Bad parse errors. Just forget about it. */
3332 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3336 c_common_write_pch ();
3338 /* FIXME - huh? was input_line -= 1;*/
3340 /* We now have to write out all the stuff we put off writing out.
3343 o Template specializations that we have not yet instantiated,
3344 but which are needed.
3345 o Initialization and destruction for non-local objects with
3346 static storage duration. (Local objects with static storage
3347 duration are initialized when their scope is first entered,
3348 and are cleaned up via atexit.)
3349 o Virtual function tables.
3351 All of these may cause others to be needed. For example,
3352 instantiating one function may cause another to be needed, and
3353 generating the initializer for an object may cause templates to be
3354 instantiated, etc., etc. */
3356 timevar_push (TV_VARCONST);
3358 emit_support_tinfos ();
3367 /* If there are templates that we've put off instantiating, do
3369 instantiate_pending_templates (retries);
3372 /* Write out virtual tables as required. Note that writing out
3373 the virtual table for a template class may cause the
3374 instantiation of members of that class. If we write out
3375 vtables then we remove the class from our list so we don't
3376 have to look at it again. */
3378 while (keyed_classes != NULL_TREE
3379 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3382 keyed_classes = TREE_CHAIN (keyed_classes);
3388 tree next = TREE_CHAIN (t);
3392 if (maybe_emit_vtables (TREE_VALUE (next)))
3395 TREE_CHAIN (t) = TREE_CHAIN (next);
3400 next = TREE_CHAIN (t);
3404 /* Write out needed type info variables. We have to be careful
3405 looping through unemitted decls, because emit_tinfo_decl may
3406 cause other variables to be needed. New elements will be
3407 appended, and we remove from the vector those that actually
3409 for (i = VEC_length (tree, unemitted_tinfo_decls);
3410 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3411 if (emit_tinfo_decl (t))
3414 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3417 /* The list of objects with static storage duration is built up
3418 in reverse order. We clear STATIC_AGGREGATES so that any new
3419 aggregates added during the initialization of these will be
3420 initialized in the correct order when we next come around the
3422 vars = prune_vars_needing_no_initialization (&static_aggregates);
3426 /* We need to start a new initialization function each time
3427 through the loop. That's because we need to know which
3428 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3429 isn't computed until a function is finished, and written
3430 out. That's a deficiency in the back end. When this is
3431 fixed, these initialization functions could all become
3432 inline, with resulting performance improvements. */
3435 /* Set the line and file, so that it is obviously not from
3437 input_location = locus;
3438 ssdf_body = start_static_storage_duration_function (ssdf_count);
3440 /* Make sure the back end knows about all the variables. */
3441 write_out_vars (vars);
3443 /* First generate code to do all the initializations. */
3445 do_static_initialization_or_destruction (vars, /*initp=*/true);
3447 /* Then, generate code to do all the destructions. Do these
3448 in reverse order so that the most recently constructed
3449 variable is the first destroyed. If we're using
3450 __cxa_atexit, then we don't need to do this; functions
3451 were registered at initialization time to destroy the
3453 if (!flag_use_cxa_atexit && vars)
3455 vars = nreverse (vars);
3456 do_static_initialization_or_destruction (vars, /*initp=*/false);
3461 /* Finish up the static storage duration function for this
3463 input_location = locus;
3464 finish_static_storage_duration_function (ssdf_body);
3466 /* All those initializations and finalizations might cause
3467 us to need more inline functions, more template
3468 instantiations, etc. */
3471 /* ??? was: locus.line++; */
3474 /* Go through the set of inline functions whose bodies have not
3475 been emitted yet. If out-of-line copies of these functions
3476 are required, emit them. */
3477 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3479 /* Does it need synthesizing? */
3480 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3481 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3483 /* Even though we're already at the top-level, we push
3484 there again. That way, when we pop back a few lines
3485 hence, all of our state is restored. Otherwise,
3486 finish_function doesn't clean things up, and we end
3487 up with CURRENT_FUNCTION_DECL set. */
3488 push_to_top_level ();
3489 /* The decl's location will mark where it was first
3490 needed. Save that so synthesize method can indicate
3491 where it was needed from, in case of error */
3492 input_location = DECL_SOURCE_LOCATION (decl);
3493 synthesize_method (decl);
3494 pop_from_top_level ();
3498 if (!gimple_body (decl))
3501 /* We lie to the back end, pretending that some functions
3502 are not defined when they really are. This keeps these
3503 functions from being put out unnecessarily. But, we must
3504 stop lying when the functions are referenced, or if they
3505 are not comdat since they need to be put out now. If
3506 DECL_INTERFACE_KNOWN, then we have already set
3507 DECL_EXTERNAL appropriately, so there's no need to check
3508 again, and we do not want to clear DECL_EXTERNAL if a
3509 previous call to import_export_decl set it.
3511 This is done in a separate for cycle, because if some
3512 deferred function is contained in another deferred
3513 function later in deferred_fns varray,
3514 rest_of_compilation would skip this function and we
3515 really cannot expand the same function twice. */
3516 import_export_decl (decl);
3517 if (DECL_NOT_REALLY_EXTERN (decl)
3518 && DECL_INITIAL (decl)
3519 && decl_needed_p (decl))
3520 DECL_EXTERNAL (decl) = 0;
3522 /* If we're going to need to write this function out, and
3523 there's already a body for it, create RTL for it now.
3524 (There might be no body if this is a method we haven't
3525 gotten around to synthesizing yet.) */
3526 if (!DECL_EXTERNAL (decl)
3527 && decl_needed_p (decl)
3528 && !TREE_ASM_WRITTEN (decl)
3529 && !cgraph_node (decl)->local.finalized)
3531 /* We will output the function; no longer consider it in this
3533 DECL_DEFER_OUTPUT (decl) = 0;
3534 /* Generate RTL for this function now that we know we
3536 expand_or_defer_fn (decl);
3537 /* If we're compiling -fsyntax-only pretend that this
3538 function has been written out so that we don't try to
3540 if (flag_syntax_only)
3541 TREE_ASM_WRITTEN (decl) = 1;
3546 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3549 /* Static data members are just like namespace-scope globals. */
3550 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3552 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3553 /* Don't write it out if we haven't seen a definition. */
3554 || DECL_IN_AGGR_P (decl))
3556 import_export_decl (decl);
3557 /* If this static data member is needed, provide it to the
3559 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3560 DECL_EXTERNAL (decl) = 0;
3562 if (VEC_length (tree, pending_statics) != 0
3563 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3564 VEC_length (tree, pending_statics)))
3571 /* All used inline functions must have a definition at this point. */
3572 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3574 if (/* Check online inline functions that were actually used. */
3575 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3576 /* If the definition actually was available here, then the
3577 fact that the function was not defined merely represents
3578 that for some reason (use of a template repository,
3579 #pragma interface, etc.) we decided not to emit the
3581 && !DECL_INITIAL (decl)
3582 /* An explicit instantiation can be used to specify
3583 that the body is in another unit. It will have
3584 already verified there was a definition. */
3585 && !DECL_EXPLICIT_INSTANTIATION (decl))
3587 warning (0, "inline function %q+D used but never defined", decl);
3588 /* Avoid a duplicate warning from check_global_declaration_1. */
3589 TREE_NO_WARNING (decl) = 1;
3593 /* We give C linkage to static constructors and destructors. */
3594 push_lang_context (lang_name_c);
3596 /* Generate initialization and destruction functions for all
3597 priorities for which they are required. */
3598 if (priority_info_map)
3599 splay_tree_foreach (priority_info_map,
3600 generate_ctor_and_dtor_functions_for_priority,
3602 else if (c_dialect_objc () && objc_static_init_needed_p ())
3603 /* If this is obj-c++ and we need a static init, call
3604 generate_ctor_or_dtor_function. */
3605 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3606 DEFAULT_INIT_PRIORITY, &locus);
3608 /* We're done with the splay-tree now. */
3609 if (priority_info_map)
3610 splay_tree_delete (priority_info_map);
3612 /* Generate any missing aliases. */
3613 maybe_apply_pending_pragma_weaks ();
3615 /* We're done with static constructors, so we can go back to "C++"
3617 pop_lang_context ();
3619 cgraph_finalize_compilation_unit ();
3622 /* Now, issue warnings about static, but not defined, functions,
3623 etc., and emit debugging information. */
3624 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3625 if (VEC_length (tree, pending_statics) != 0)
3627 check_global_declarations (VEC_address (tree, pending_statics),
3628 VEC_length (tree, pending_statics));
3629 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3630 VEC_length (tree, pending_statics));
3633 /* Generate hidden aliases for Java. */
3634 build_java_method_aliases ();
3638 /* The entire file is now complete. If requested, dump everything
3642 FILE *stream = dump_begin (TDI_tu, &flags);
3646 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3647 dump_end (TDI_tu, stream);
3651 timevar_pop (TV_VARCONST);
3653 if (flag_detailed_statistics)
3655 dump_tree_statistics ();
3656 dump_time_statistics ();
3658 input_location = locus;
3660 #ifdef ENABLE_CHECKING
3661 validate_conversion_obstack ();
3662 #endif /* ENABLE_CHECKING */
3665 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3666 function to call in parse-tree form; it has not yet been
3667 semantically analyzed. ARGS are the arguments to the function.
3668 They have already been semantically analyzed. */
3671 build_offset_ref_call_from_tree (tree fn, tree args)
3680 object = TREE_OPERAND (fn, 0);
3682 if (processing_template_decl)
3684 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3685 || TREE_CODE (fn) == MEMBER_REF);
3686 if (type_dependent_expression_p (fn)
3687 || any_type_dependent_arguments_p (args))
3688 return build_nt_call_list (fn, args);
3690 /* Transform the arguments and add the implicit "this"
3691 parameter. That must be done before the FN is transformed
3692 because we depend on the form of FN. */
3693 args = build_non_dependent_args (args);
3694 object = build_non_dependent_expr (object);
3695 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3696 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3697 args = tree_cons (NULL_TREE, object, args);
3698 /* Now that the arguments are done, transform FN. */
3699 fn = build_non_dependent_expr (fn);
3702 /* A qualified name corresponding to a bound pointer-to-member is
3703 represented as an OFFSET_REF:
3705 struct B { void g(); };
3707 void B::g() { (this->*p)(); } */
3708 if (TREE_CODE (fn) == OFFSET_REF)
3710 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3711 tf_warning_or_error);
3712 fn = TREE_OPERAND (fn, 1);
3713 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3714 args = tree_cons (NULL_TREE, object_addr, args);
3717 expr = cp_build_function_call (fn, args, tf_warning_or_error);
3718 if (processing_template_decl && expr != error_mark_node)
3719 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3725 check_default_args (tree x)
3727 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3728 bool saw_def = false;
3729 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3730 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3732 if (TREE_PURPOSE (arg))
3736 error ("default argument missing for parameter %P of %q+#D", i, x);
3737 TREE_PURPOSE (arg) = error_mark_node;
3742 /* Return true if function DECL can be inlined. This is used to force
3743 instantiation of methods that might be interesting for inlining. */
3745 possibly_inlined_p (tree decl)
3747 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3748 if (DECL_UNINLINABLE (decl))
3751 return DECL_DECLARED_INLINE_P (decl);
3752 /* When optimizing, we might inline everything when flatten
3753 attribute or heuristics inlining for size or autoinlining
3758 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3759 If DECL is a specialization or implicitly declared class member,
3760 generate the actual definition. */
3763 mark_used (tree decl)
3765 HOST_WIDE_INT saved_processing_template_decl = 0;
3767 /* If DECL is a BASELINK for a single function, then treat it just
3768 like the DECL for the function. Otherwise, if the BASELINK is
3769 for an overloaded function, we don't know which function was
3770 actually used until after overload resolution. */
3771 if (TREE_CODE (decl) == BASELINK)
3773 decl = BASELINK_FUNCTIONS (decl);
3774 if (really_overloaded_fn (decl))
3776 decl = OVL_CURRENT (decl);
3779 TREE_USED (decl) = 1;
3780 if (DECL_CLONED_FUNCTION_P (decl))
3781 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3782 if (TREE_CODE (decl) == FUNCTION_DECL
3783 && DECL_DELETED_FN (decl))
3785 error ("deleted function %q+D", decl);
3786 error ("used here");
3788 /* If we don't need a value, then we don't need to synthesize DECL. */
3789 if (skip_evaluation)
3792 /* If within finish_function, defer the rest until that function
3793 finishes, otherwise it might recurse. */
3794 if (defer_mark_used_calls)
3796 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
3800 /* Normally, we can wait until instantiation-time to synthesize
3801 DECL. However, if DECL is a static data member initialized with
3802 a constant, we need the value right now because a reference to
3803 such a data member is not value-dependent. */
3804 if (TREE_CODE (decl) == VAR_DECL
3805 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3806 && DECL_CLASS_SCOPE_P (decl))
3808 /* Don't try to instantiate members of dependent types. We
3809 cannot just use dependent_type_p here because this function
3810 may be called from fold_non_dependent_expr, and then we may
3811 see dependent types, even though processing_template_decl
3813 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3814 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3816 /* Pretend that we are not in a template, even if we are, so
3817 that the static data member initializer will be processed. */
3818 saved_processing_template_decl = processing_template_decl;
3819 processing_template_decl = 0;
3822 if (processing_template_decl)
3825 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3826 && !TREE_ASM_WRITTEN (decl))
3827 /* Remember it, so we can check it was defined. */
3829 if (DECL_DEFERRED_FN (decl))
3832 /* Remember the current location for a function we will end up
3833 synthesizing. Then we can inform the user where it was
3834 required in the case of error. */
3835 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3836 && !DECL_THUNK_P (decl))
3837 DECL_SOURCE_LOCATION (decl) = input_location;
3839 note_vague_linkage_fn (decl);
3842 /* Is it a synthesized method that needs to be synthesized? */
3843 if (TREE_CODE (decl) == FUNCTION_DECL
3844 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3845 && DECL_DEFAULTED_FN (decl)
3846 && !DECL_THUNK_P (decl)
3847 && ! DECL_INITIAL (decl)
3848 /* Kludge: don't synthesize for default args. Unfortunately this
3849 rules out initializers of namespace-scoped objects too, but
3850 it's sort-of ok if the implicit ctor or dtor decl keeps
3851 pointing to the class location. */
3852 && current_function_decl)
3854 synthesize_method (decl);
3855 /* If we've already synthesized the method we don't need to
3856 do the instantiation test below. */
3858 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3859 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3860 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3861 || (TREE_CODE (decl) == FUNCTION_DECL
3862 && possibly_inlined_p
3863 (DECL_TEMPLATE_RESULT (
3864 template_for_substitution (decl))))
3865 /* We need to instantiate static data members so that there
3866 initializers are available in integral constant
3868 || (TREE_CODE (decl) == VAR_DECL
3869 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3870 /* If this is a function or variable that is an instance of some
3871 template, we now know that we will need to actually do the
3872 instantiation. We check that DECL is not an explicit
3873 instantiation because that is not checked in instantiate_decl.
3875 We put off instantiating functions in order to improve compile
3876 times. Maintaining a stack of active functions is expensive,
3877 and the inliner knows to instantiate any functions it might
3878 need. Therefore, we always try to defer instantiation. */
3879 instantiate_decl (decl, /*defer_ok=*/true,
3880 /*expl_inst_class_mem_p=*/false);
3882 processing_template_decl = saved_processing_template_decl;
3885 #include "gt-cp-decl2.h"