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);
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)
575 gcc_assert (!template_parms
576 || comp_template_parms (template_parms,
577 DECL_TEMPLATE_PARMS (function)));
578 template_parms = DECL_TEMPLATE_PARMS (function);
581 /* OK, is this a definition of a member template? */
582 is_template = (template_parms != NULL_TREE);
584 /* We must enter the scope here, because conversion operators are
585 named by target type, and type equivalence relies on typenames
586 resolving within the scope of CTYPE. */
587 pushed_scope = push_scope (ctype);
588 ix = class_method_index_for_fn (complete_type (ctype), function);
591 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
592 tree fndecls, fndecl = 0;
594 const char *format = NULL;
596 for (fndecls = VEC_index (tree, methods, ix);
597 fndecls; fndecls = OVL_NEXT (fndecls))
601 fndecl = OVL_CURRENT (fndecls);
602 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
603 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
605 /* We cannot simply call decls_match because this doesn't
606 work for static member functions that are pretending to
607 be methods, and because the name may have been changed by
610 /* Get rid of the this parameter on functions that become
612 if (DECL_STATIC_FUNCTION_P (fndecl)
613 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
614 p1 = TREE_CHAIN (p1);
616 /* A member template definition only matches a member template
618 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
621 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
622 TREE_TYPE (TREE_TYPE (fndecl)))
623 && compparms (p1, p2)
625 || comp_template_parms (template_parms,
626 DECL_TEMPLATE_PARMS (fndecl)))
627 && (DECL_TEMPLATE_SPECIALIZATION (function)
628 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
629 && (!DECL_TEMPLATE_SPECIALIZATION (function)
630 || (DECL_TI_TEMPLATE (function)
631 == DECL_TI_TEMPLATE (fndecl))))
637 pop_scope (pushed_scope);
638 return OVL_CURRENT (fndecls);
641 error ("prototype for %q#D does not match any in class %qT",
643 is_conv_op = DECL_CONV_FN_P (fndecl);
646 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
647 fndecls = VEC_index (tree, methods, ix);
650 fndecl = OVL_CURRENT (fndecls);
651 fndecls = OVL_NEXT (fndecls);
653 if (!fndecls && is_conv_op)
655 if (VEC_length (tree, methods) > (size_t) ++ix)
657 fndecls = VEC_index (tree, methods, ix);
658 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
670 format = N_("candidates are: %+#D");
672 format = N_("candidate is: %+#D");
673 error (format, fndecl);
676 else if (!COMPLETE_TYPE_P (ctype))
677 cxx_incomplete_type_error (function, ctype);
679 error ("no %q#D member function declared in class %qT",
683 pop_scope (pushed_scope);
684 return error_mark_node;
687 /* DECL is a function with vague linkage. Remember it so that at the
688 end of the translation unit we can decide whether or not to emit
692 note_vague_linkage_fn (tree decl)
694 if (!DECL_DEFERRED_FN (decl))
696 DECL_DEFERRED_FN (decl) = 1;
697 DECL_DEFER_OUTPUT (decl) = 1;
698 VEC_safe_push (tree, gc, deferred_fns, decl);
702 /* We have just processed the DECL, which is a static data member.
703 The other parameters are as for cp_finish_decl. */
706 finish_static_data_member_decl (tree decl,
707 tree init, bool init_const_expr_p,
711 DECL_CONTEXT (decl) = current_class_type;
713 /* We cannot call pushdecl here, because that would fill in the
714 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
715 the right thing, namely, to put this decl out straight away. */
717 if (! processing_template_decl)
718 VEC_safe_push (tree, gc, pending_statics, decl);
720 if (LOCAL_CLASS_P (current_class_type))
721 permerror (input_location, "local class %q#T shall not have static data member %q#D",
722 current_class_type, decl);
724 /* Static consts need not be initialized in the class definition. */
725 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
727 static int explained = 0;
729 error ("initializer invalid for static member with constructor");
732 error ("(an out of class initialization is required)");
737 /* Force the compiler to know when an uninitialized static const
738 member is being used. */
739 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
740 TREE_USED (decl) = 1;
741 DECL_INITIAL (decl) = init;
742 DECL_IN_AGGR_P (decl) = 1;
744 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
747 /* DECLARATOR and DECLSPECS correspond to a class member. The other
748 parameters are as for cp_finish_decl. Return the DECL for the
749 class member declared. */
752 grokfield (const cp_declarator *declarator,
753 cp_decl_specifier_seq *declspecs,
754 tree init, bool init_const_expr_p,
759 const char *asmspec = 0;
760 int flags = LOOKUP_ONLYCONVERTING;
763 && TREE_CODE (init) == TREE_LIST
764 && TREE_VALUE (init) == error_mark_node
765 && TREE_CHAIN (init) == NULL_TREE)
768 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
769 if (! value || error_operand_p (value))
770 /* friend or constructor went bad. */
771 return error_mark_node;
773 if (TREE_CODE (value) == TYPE_DECL && init)
775 error ("typedef %qD is initialized (use __typeof__ instead)", value);
779 /* Pass friendly classes back. */
780 if (value == void_type_node)
783 /* Pass friend decls back. */
784 if ((TREE_CODE (value) == FUNCTION_DECL
785 || TREE_CODE (value) == TEMPLATE_DECL)
786 && DECL_CONTEXT (value) != current_class_type)
789 if (DECL_NAME (value) != NULL_TREE
790 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
791 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
792 error ("member %qD conflicts with virtual function table field name",
795 /* Stash away type declarations. */
796 if (TREE_CODE (value) == TYPE_DECL)
798 DECL_NONLOCAL (value) = 1;
799 DECL_CONTEXT (value) = current_class_type;
801 if (processing_template_decl)
802 value = push_template_decl (value);
805 cplus_decl_attributes (&value, attrlist, 0);
810 if (DECL_IN_AGGR_P (value))
812 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
813 return void_type_node;
816 if (asmspec_tree && asmspec_tree != error_mark_node)
817 asmspec = TREE_STRING_POINTER (asmspec_tree);
821 if (TREE_CODE (value) == FUNCTION_DECL)
823 /* Initializers for functions are rejected early in the parser.
824 If we get here, it must be a pure specifier for a method. */
825 if (init == ridpointers[(int)RID_DELETE])
827 DECL_DELETED_FN (value) = 1;
828 DECL_DECLARED_INLINE_P (value) = 1;
829 DECL_INITIAL (value) = error_mark_node;
831 else if (init == ridpointers[(int)RID_DEFAULT])
833 if (!defaultable_fn_p (value))
834 error ("%qD cannot be defaulted", value);
837 DECL_DEFAULTED_FN (value) = 1;
838 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
839 DECL_DECLARED_INLINE_P (value) = 1;
842 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
844 gcc_assert (error_operand_p (init) || integer_zerop (init));
845 DECL_PURE_VIRTUAL_P (value) = 1;
849 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
850 error ("initializer specified for static member function %qD",
854 else if (pedantic && TREE_CODE (value) != VAR_DECL)
855 /* Already complained in grokdeclarator. */
857 else if (!processing_template_decl)
859 if (TREE_CODE (init) == CONSTRUCTOR)
860 init = digest_init (TREE_TYPE (value), init);
862 init = integral_constant_value (init);
864 if (init != error_mark_node && !TREE_CONSTANT (init))
866 /* We can allow references to things that are effectively
867 static, since references are initialized with the
869 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
870 || (TREE_STATIC (init) == 0
871 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
873 error ("field initializer is not constant");
874 init = error_mark_node;
880 if (processing_template_decl
881 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
883 value = push_template_decl (value);
884 if (error_operand_p (value))
885 return error_mark_node;
889 cplus_decl_attributes (&value, attrlist, 0);
891 switch (TREE_CODE (value))
894 finish_static_data_member_decl (value, init, init_const_expr_p,
895 asmspec_tree, flags);
900 error ("%<asm%> specifiers are not permitted on non-static data members");
901 if (DECL_INITIAL (value) == error_mark_node)
902 init = error_mark_node;
903 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
905 DECL_INITIAL (value) = init;
906 DECL_IN_AGGR_P (value) = 1;
911 set_user_assembler_name (value, asmspec);
913 cp_finish_decl (value,
915 /*init_const_expr_p=*/false,
916 asmspec_tree, flags);
918 /* Pass friends back this way. */
919 if (DECL_FRIEND_P (value))
920 return void_type_node;
922 DECL_IN_AGGR_P (value) = 1;
931 /* Like `grokfield', but for bitfields.
932 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
935 grokbitfield (const cp_declarator *declarator,
936 cp_decl_specifier_seq *declspecs, tree width,
939 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
941 if (value == error_mark_node)
942 return NULL_TREE; /* friends went bad. */
944 /* Pass friendly classes back. */
945 if (TREE_CODE (value) == VOID_TYPE)
946 return void_type_node;
948 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
949 && (POINTER_TYPE_P (value)
950 || !dependent_type_p (TREE_TYPE (value))))
952 error ("bit-field %qD with non-integral type", value);
953 return error_mark_node;
956 if (TREE_CODE (value) == TYPE_DECL)
958 error ("cannot declare %qD to be a bit-field type", value);
962 /* Usually, finish_struct_1 catches bitfields with invalid types.
963 But, in the case of bitfields with function type, we confuse
964 ourselves into thinking they are member functions, so we must
966 if (TREE_CODE (value) == FUNCTION_DECL)
968 error ("cannot declare bit-field %qD with function type",
973 if (DECL_IN_AGGR_P (value))
975 error ("%qD is already defined in the class %qT", value,
976 DECL_CONTEXT (value));
977 return void_type_node;
980 if (TREE_STATIC (value))
982 error ("static member %qD cannot be a bit-field", value);
985 finish_decl (value, NULL_TREE, NULL_TREE);
987 if (width != error_mark_node)
989 constant_expression_warning (width);
990 DECL_INITIAL (value) = width;
991 SET_DECL_C_BIT_FIELD (value);
994 DECL_IN_AGGR_P (value) = 1;
997 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1003 /* Returns true iff ATTR is an attribute which needs to be applied at
1004 instantiation time rather than template definition time. */
1007 is_late_template_attribute (tree attr, tree decl)
1009 tree name = TREE_PURPOSE (attr);
1010 tree args = TREE_VALUE (attr);
1011 const struct attribute_spec *spec = lookup_attribute_spec (name);
1015 /* Unknown attribute. */
1018 /* Attribute weak handling wants to write out assembly right away. */
1019 if (is_attribute_p ("weak", name))
1022 /* If any of the arguments are dependent expressions, we can't evaluate
1023 the attribute until instantiation time. */
1024 for (arg = args; arg; arg = TREE_CHAIN (arg))
1026 tree t = TREE_VALUE (arg);
1028 /* If the first attribute argument is an identifier, only consider
1029 second and following arguments. Attributes like mode, format,
1030 cleanup and several target specific attributes aren't late
1031 just because they have an IDENTIFIER_NODE as first argument. */
1032 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1035 if (value_dependent_expression_p (t)
1036 || type_dependent_expression_p (t))
1040 if (TREE_CODE (decl) == TYPE_DECL
1042 || spec->type_required)
1044 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1046 /* We can't apply any attributes to a completely unknown type until
1047 instantiation time. */
1048 enum tree_code code = TREE_CODE (type);
1049 if (code == TEMPLATE_TYPE_PARM
1050 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1051 || code == TYPENAME_TYPE)
1053 /* Also defer most attributes on dependent types. This is not
1054 necessary in all cases, but is the better default. */
1055 else if (dependent_type_p (type)
1056 /* But attribute visibility specifically works on
1058 && !is_attribute_p ("visibility", name))
1067 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1068 applied at instantiation time and return them. If IS_DEPENDENT is true,
1069 the declaration itself is dependent, so all attributes should be applied
1070 at instantiation time. */
1073 splice_template_attributes (tree *attr_p, tree decl)
1076 tree late_attrs = NULL_TREE;
1077 tree *q = &late_attrs;
1084 if (is_late_template_attribute (*p, decl))
1086 ATTR_IS_DEPENDENT (*p) = 1;
1088 *p = TREE_CHAIN (*p);
1089 q = &TREE_CHAIN (*q);
1093 p = &TREE_CHAIN (*p);
1099 /* Remove any late attributes from the list in ATTR_P and attach them to
1103 save_template_attributes (tree *attr_p, tree *decl_p)
1105 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1107 tree old_attrs = NULL_TREE;
1112 /* Give this type a name so we know to look it up again at instantiation
1114 if (TREE_CODE (*decl_p) == TYPE_DECL
1115 && DECL_ORIGINAL_TYPE (*decl_p) == NULL_TREE)
1117 tree oldt = TREE_TYPE (*decl_p);
1118 tree newt = build_variant_type_copy (oldt);
1119 DECL_ORIGINAL_TYPE (*decl_p) = oldt;
1120 TREE_TYPE (*decl_p) = newt;
1121 TYPE_NAME (newt) = *decl_p;
1122 TREE_USED (newt) = TREE_USED (*decl_p);
1125 if (DECL_P (*decl_p))
1126 q = &DECL_ATTRIBUTES (*decl_p);
1128 q = &TYPE_ATTRIBUTES (*decl_p);
1132 /* Place the late attributes at the beginning of the attribute
1134 TREE_CHAIN (tree_last (late_attrs)) = *q;
1137 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1139 /* We've added new attributes directly to the main variant, so
1140 now we need to update all of the other variants to include
1141 these new attributes. */
1143 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1144 variant = TYPE_NEXT_VARIANT (variant))
1146 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1147 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1152 /* Like reconstruct_complex_type, but handle also template trees. */
1155 cp_reconstruct_complex_type (tree type, tree bottom)
1159 if (TREE_CODE (type) == POINTER_TYPE)
1161 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1162 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1163 TYPE_REF_CAN_ALIAS_ALL (type));
1165 else if (TREE_CODE (type) == REFERENCE_TYPE)
1167 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1168 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1169 TYPE_REF_CAN_ALIAS_ALL (type));
1171 else if (TREE_CODE (type) == ARRAY_TYPE)
1173 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1174 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1175 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1176 element type qualification will be handled by the recursive
1177 cp_reconstruct_complex_type call and cp_build_qualified_type
1178 for ARRAY_TYPEs changes the element type. */
1181 else if (TREE_CODE (type) == FUNCTION_TYPE)
1183 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1184 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1186 else if (TREE_CODE (type) == METHOD_TYPE)
1188 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1189 /* The build_method_type_directly() routine prepends 'this' to argument list,
1190 so we must compensate by getting rid of it. */
1192 = build_method_type_directly
1193 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1195 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1197 else if (TREE_CODE (type) == OFFSET_TYPE)
1199 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1200 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1205 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1208 /* Like decl_attributes, but handle C++ complexity. */
1211 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1213 if (*decl == NULL_TREE || *decl == void_type_node
1214 || *decl == error_mark_node
1215 || attributes == NULL_TREE)
1218 if (processing_template_decl)
1220 if (check_for_bare_parameter_packs (attributes))
1223 save_template_attributes (&attributes, decl);
1224 if (attributes == NULL_TREE)
1228 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1229 decl = &DECL_TEMPLATE_RESULT (*decl);
1231 decl_attributes (decl, attributes, flags);
1233 if (TREE_CODE (*decl) == TYPE_DECL)
1234 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1237 /* Walks through the namespace- or function-scope anonymous union
1238 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1239 Returns one of the fields for use in the mangled name. */
1242 build_anon_union_vars (tree type, tree object)
1244 tree main_decl = NULL_TREE;
1247 /* Rather than write the code to handle the non-union case,
1248 just give an error. */
1249 if (TREE_CODE (type) != UNION_TYPE)
1250 error ("anonymous struct not inside named type");
1252 for (field = TYPE_FIELDS (type);
1254 field = TREE_CHAIN (field))
1259 if (DECL_ARTIFICIAL (field))
1261 if (TREE_CODE (field) != FIELD_DECL)
1263 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1264 "have non-static data members", field);
1268 if (TREE_PRIVATE (field))
1269 permerror (input_location, "private member %q+#D in anonymous union", field);
1270 else if (TREE_PROTECTED (field))
1271 permerror (input_location, "protected member %q+#D in anonymous union", field);
1273 if (processing_template_decl)
1274 ref = build_min_nt (COMPONENT_REF, object,
1275 DECL_NAME (field), NULL_TREE);
1277 ref = build_class_member_access_expr (object, field, NULL_TREE,
1278 false, tf_warning_or_error);
1280 if (DECL_NAME (field))
1284 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1285 DECL_ANON_UNION_VAR_P (decl) = 1;
1287 base = get_base_address (object);
1288 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1289 TREE_STATIC (decl) = TREE_STATIC (base);
1290 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1292 SET_DECL_VALUE_EXPR (decl, ref);
1293 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1295 decl = pushdecl (decl);
1297 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1298 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1302 if (main_decl == NULL_TREE)
1309 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1310 anonymous union, then all members must be laid out together. PUBLIC_P
1311 is nonzero if this union is not declared static. */
1314 finish_anon_union (tree anon_union_decl)
1320 if (anon_union_decl == error_mark_node)
1323 type = TREE_TYPE (anon_union_decl);
1324 public_p = TREE_PUBLIC (anon_union_decl);
1326 /* The VAR_DECL's context is the same as the TYPE's context. */
1327 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1329 if (TYPE_FIELDS (type) == NULL_TREE)
1334 error ("namespace-scope anonymous aggregates must be static");
1338 main_decl = build_anon_union_vars (type, anon_union_decl);
1339 if (main_decl == error_mark_node)
1341 if (main_decl == NULL_TREE)
1343 warning (0, "anonymous union with no members");
1347 if (!processing_template_decl)
1349 /* Use main_decl to set the mangled name. */
1350 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1351 mangle_decl (anon_union_decl);
1352 DECL_NAME (anon_union_decl) = NULL_TREE;
1355 pushdecl (anon_union_decl);
1356 if (building_stmt_tree ()
1357 && at_function_scope_p ())
1358 add_decl_expr (anon_union_decl);
1359 else if (!processing_template_decl)
1360 rest_of_decl_compilation (anon_union_decl,
1361 toplevel_bindings_p (), at_eof);
1364 /* Auxiliary functions to make type signatures for
1365 `operator new' and `operator delete' correspond to
1366 what compiler will be expecting. */
1369 coerce_new_type (tree type)
1372 tree args = TYPE_ARG_TYPES (type);
1374 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1376 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1379 error ("%<operator new%> must return type %qT", ptr_type_node);
1382 if (args && args != void_list_node)
1384 if (TREE_PURPOSE (args))
1386 /* [basic.stc.dynamic.allocation]
1388 The first parameter shall not have an associated default
1390 error ("the first parameter of %<operator new%> cannot "
1391 "have a default argument");
1392 /* Throw away the default argument. */
1393 TREE_PURPOSE (args) = NULL_TREE;
1396 if (!same_type_p (TREE_VALUE (args), size_type_node))
1399 args = TREE_CHAIN (args);
1406 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1407 "as first parameter", size_type_node);
1412 args = tree_cons (NULL_TREE, size_type_node, args);
1415 type = build_exception_variant
1416 (build_function_type (ptr_type_node, args),
1417 TYPE_RAISES_EXCEPTIONS (type));
1425 coerce_delete_type (tree type)
1428 tree args = TYPE_ARG_TYPES (type);
1430 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1432 if (!same_type_p (TREE_TYPE (type), void_type_node))
1435 error ("%<operator delete%> must return type %qT", void_type_node);
1438 if (!args || args == void_list_node
1439 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1442 if (args && args != void_list_node)
1443 args = TREE_CHAIN (args);
1444 error ("%<operator delete%> takes type %qT as first parameter",
1450 args = tree_cons (NULL_TREE, ptr_type_node, args);
1453 type = build_exception_variant
1454 (build_function_type (void_type_node, args),
1455 TYPE_RAISES_EXCEPTIONS (type));
1463 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1464 and mark them as needed. */
1467 mark_vtable_entries (tree decl)
1470 unsigned HOST_WIDE_INT idx;
1472 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1477 STRIP_NOPS (fnaddr);
1479 if (TREE_CODE (fnaddr) != ADDR_EXPR
1480 && TREE_CODE (fnaddr) != FDESC_EXPR)
1481 /* This entry is an offset: a virtual base class offset, a
1482 virtual call offset, an RTTI offset, etc. */
1485 fn = TREE_OPERAND (fnaddr, 0);
1486 TREE_ADDRESSABLE (fn) = 1;
1487 /* When we don't have vcall offsets, we output thunks whenever
1488 we output the vtables that contain them. With vcall offsets,
1489 we know all the thunks we'll need when we emit a virtual
1490 function, so we emit the thunks there instead. */
1491 if (DECL_THUNK_P (fn))
1492 use_thunk (fn, /*emit_p=*/0);
1497 /* Set DECL up to have the closest approximation of "initialized common"
1498 linkage available. */
1501 comdat_linkage (tree decl)
1504 make_decl_one_only (decl);
1505 else if (TREE_CODE (decl) == FUNCTION_DECL
1506 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1507 /* We can just emit function and compiler-generated variables
1508 statically; having multiple copies is (for the most part) only
1511 There are two correctness issues, however: the address of a
1512 template instantiation with external linkage should be the
1513 same, independent of what translation unit asks for the
1514 address, and this will not hold when we emit multiple copies of
1515 the function. However, there's little else we can do.
1517 Also, by default, the typeinfo implementation assumes that
1518 there will be only one copy of the string used as the name for
1519 each type. Therefore, if weak symbols are unavailable, the
1520 run-time library should perform a more conservative check; it
1521 should perform a string comparison, rather than an address
1523 TREE_PUBLIC (decl) = 0;
1526 /* Static data member template instantiations, however, cannot
1527 have multiple copies. */
1528 if (DECL_INITIAL (decl) == 0
1529 || DECL_INITIAL (decl) == error_mark_node)
1530 DECL_COMMON (decl) = 1;
1531 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1533 DECL_COMMON (decl) = 1;
1534 DECL_INITIAL (decl) = error_mark_node;
1536 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1538 /* We can't do anything useful; leave vars for explicit
1540 DECL_EXTERNAL (decl) = 1;
1541 DECL_NOT_REALLY_EXTERN (decl) = 0;
1545 if (DECL_LANG_SPECIFIC (decl))
1546 DECL_COMDAT (decl) = 1;
1549 /* For win32 we also want to put explicit instantiations in
1550 linkonce sections, so that they will be merged with implicit
1551 instantiations; otherwise we get duplicate symbol errors.
1552 For Darwin we do not want explicit instantiations to be
1556 maybe_make_one_only (tree decl)
1558 /* We used to say that this was not necessary on targets that support weak
1559 symbols, because the implicit instantiations will defer to the explicit
1560 one. However, that's not actually the case in SVR4; a strong definition
1561 after a weak one is an error. Also, not making explicit
1562 instantiations one_only means that we can end up with two copies of
1563 some template instantiations. */
1567 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1568 we can get away with not emitting them if they aren't used. We need
1569 to for variables so that cp_finish_decl will update their linkage,
1570 because their DECL_INITIAL may not have been set properly yet. */
1572 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1573 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1574 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1576 make_decl_one_only (decl);
1578 if (TREE_CODE (decl) == VAR_DECL)
1580 DECL_COMDAT (decl) = 1;
1581 /* Mark it needed so we don't forget to emit it. */
1582 mark_decl_referenced (decl);
1587 /* Determine whether or not we want to specifically import or export CTYPE,
1588 using various heuristics. */
1591 import_export_class (tree ctype)
1593 /* -1 for imported, 1 for exported. */
1594 int import_export = 0;
1596 /* It only makes sense to call this function at EOF. The reason is
1597 that this function looks at whether or not the first non-inline
1598 non-abstract virtual member function has been defined in this
1599 translation unit. But, we can't possibly know that until we've
1600 seen the entire translation unit. */
1601 gcc_assert (at_eof);
1603 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1606 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1607 we will have CLASSTYPE_INTERFACE_ONLY set but not
1608 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1609 heuristic because someone will supply a #pragma implementation
1610 elsewhere, and deducing it here would produce a conflict. */
1611 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1614 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1616 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1618 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1619 && !flag_implicit_templates)
1620 /* For a template class, without -fimplicit-templates, check the
1621 repository. If the virtual table is assigned to this
1622 translation unit, then export the class; otherwise, import
1624 import_export = repo_export_class_p (ctype) ? 1 : -1;
1625 else if (TYPE_POLYMORPHIC_P (ctype))
1627 /* The ABI specifies that the virtual table and associated
1628 information are emitted with the key method, if any. */
1629 tree method = CLASSTYPE_KEY_METHOD (ctype);
1630 /* If weak symbol support is not available, then we must be
1631 careful not to emit the vtable when the key function is
1632 inline. An inline function can be defined in multiple
1633 translation units. If we were to emit the vtable in each
1634 translation unit containing a definition, we would get
1635 multiple definition errors at link-time. */
1636 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1637 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1640 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1641 a definition anywhere else. */
1642 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1645 /* Allow back ends the chance to overrule the decision. */
1646 if (targetm.cxx.import_export_class)
1647 import_export = targetm.cxx.import_export_class (ctype, import_export);
1651 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1652 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1656 /* Return true if VAR has already been provided to the back end; in that
1657 case VAR should not be modified further by the front end. */
1659 var_finalized_p (tree var)
1661 return varpool_node (var)->finalized;
1664 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1665 must be emitted in this translation unit. Mark it as such. */
1668 mark_needed (tree decl)
1670 /* It's possible that we no longer need to set
1671 TREE_SYMBOL_REFERENCED here directly, but doing so is
1673 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1674 mark_decl_referenced (decl);
1677 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1678 returns true if a definition of this entity should be provided in
1679 this object file. Callers use this function to determine whether
1680 or not to let the back end know that a definition of DECL is
1681 available in this translation unit. */
1684 decl_needed_p (tree decl)
1686 gcc_assert (TREE_CODE (decl) == VAR_DECL
1687 || TREE_CODE (decl) == FUNCTION_DECL);
1688 /* This function should only be called at the end of the translation
1689 unit. We cannot be sure of whether or not something will be
1690 COMDAT until that point. */
1691 gcc_assert (at_eof);
1693 /* All entities with external linkage that are not COMDAT should be
1694 emitted; they may be referred to from other object files. */
1695 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1697 /* If this entity was used, let the back end see it; it will decide
1698 whether or not to emit it into the object file. */
1699 if (TREE_USED (decl)
1700 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1701 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1703 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1704 reference to DECL might cause it to be emitted later. */
1708 /* If necessary, write out the vtables for the dynamic class CTYPE.
1709 Returns true if any vtables were emitted. */
1712 maybe_emit_vtables (tree ctype)
1718 /* If the vtables for this class have already been emitted there is
1719 nothing more to do. */
1720 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1721 if (var_finalized_p (primary_vtbl))
1723 /* Ignore dummy vtables made by get_vtable_decl. */
1724 if (TREE_TYPE (primary_vtbl) == void_type_node)
1727 /* On some targets, we cannot determine the key method until the end
1728 of the translation unit -- which is when this function is
1730 if (!targetm.cxx.key_method_may_be_inline ())
1731 determine_key_method (ctype);
1733 /* See if any of the vtables are needed. */
1734 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1736 import_export_decl (vtbl);
1737 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1742 /* If the references to this class' vtables are optimized away,
1743 still emit the appropriate debugging information. See
1745 if (DECL_COMDAT (primary_vtbl)
1746 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1747 note_debug_info_needed (ctype);
1751 /* The ABI requires that we emit all of the vtables if we emit any
1753 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1755 /* Mark entities references from the virtual table as used. */
1756 mark_vtable_entries (vtbl);
1758 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1760 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1762 /* It had better be all done at compile-time. */
1767 DECL_EXTERNAL (vtbl) = 0;
1768 rest_of_decl_compilation (vtbl, 1, 1);
1770 /* Because we're only doing syntax-checking, we'll never end up
1771 actually marking the variable as written. */
1772 if (flag_syntax_only)
1773 TREE_ASM_WRITTEN (vtbl) = 1;
1776 /* Since we're writing out the vtable here, also write the debug
1778 note_debug_info_needed (ctype);
1783 /* A special return value from type_visibility meaning internal
1786 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1788 /* walk_tree helper function for type_visibility. */
1791 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1793 int *vis_p = (int *)data;
1798 else if (CLASS_TYPE_P (*tp))
1800 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1802 *vis_p = VISIBILITY_ANON;
1805 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1806 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1811 /* Returns the visibility of TYPE, which is the minimum visibility of its
1815 type_visibility (tree type)
1817 int vis = VISIBILITY_DEFAULT;
1818 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1822 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1823 specified (or if VISIBILITY is static). */
1826 constrain_visibility (tree decl, int visibility)
1828 if (visibility == VISIBILITY_ANON)
1830 /* extern "C" declarations aren't affected by the anonymous
1832 if (!DECL_EXTERN_C_P (decl))
1834 TREE_PUBLIC (decl) = 0;
1835 DECL_ONE_ONLY (decl) = 0;
1836 DECL_INTERFACE_KNOWN (decl) = 1;
1837 if (DECL_LANG_SPECIFIC (decl))
1838 DECL_NOT_REALLY_EXTERN (decl) = 1;
1841 else if (visibility > DECL_VISIBILITY (decl)
1842 && !DECL_VISIBILITY_SPECIFIED (decl))
1844 DECL_VISIBILITY (decl) = visibility;
1850 /* Constrain the visibility of DECL based on the visibility of its template
1854 constrain_visibility_for_template (tree decl, tree targs)
1856 /* If this is a template instantiation, check the innermost
1857 template args for visibility constraints. The outer template
1858 args are covered by the class check. */
1859 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1861 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1865 tree arg = TREE_VEC_ELT (args, i-1);
1867 vis = type_visibility (arg);
1868 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1871 if (TREE_CODE (arg) == ADDR_EXPR)
1872 arg = TREE_OPERAND (arg, 0);
1873 if (TREE_CODE (arg) == VAR_DECL
1874 || TREE_CODE (arg) == FUNCTION_DECL)
1876 if (! TREE_PUBLIC (arg))
1877 vis = VISIBILITY_ANON;
1879 vis = DECL_VISIBILITY (arg);
1883 constrain_visibility (decl, vis);
1887 /* Like c_determine_visibility, but with additional C++-specific
1890 Function-scope entities can rely on the function's visibility because
1891 it is set in start_preparsed_function.
1893 Class-scope entities cannot rely on the class's visibility until the end
1894 of the enclosing class definition.
1896 Note that because namespaces have multiple independent definitions,
1897 namespace visibility is handled elsewhere using the #pragma visibility
1898 machinery rather than by decorating the namespace declaration.
1900 The goal is for constraints from the type to give a diagnostic, and
1901 other constraints to be applied silently. */
1904 determine_visibility (tree decl)
1906 tree class_type = NULL_TREE;
1909 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1911 /* Only relevant for names with external linkage. */
1912 if (!TREE_PUBLIC (decl))
1915 /* Cloned constructors and destructors get the same visibility as
1916 the underlying function. That should be set up in
1917 maybe_clone_body. */
1918 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1920 if (TREE_CODE (decl) == TYPE_DECL)
1922 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1923 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1924 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1929 else if (DECL_LANG_SPECIFIC (decl))
1930 use_template = DECL_USE_TEMPLATE (decl);
1934 /* If DECL is a member of a class, visibility specifiers on the
1935 class can influence the visibility of the DECL. */
1936 if (DECL_CLASS_SCOPE_P (decl))
1937 class_type = DECL_CONTEXT (decl);
1940 /* Not a class member. */
1942 /* Virtual tables have DECL_CONTEXT set to their associated class,
1943 so they are automatically handled above. */
1944 gcc_assert (TREE_CODE (decl) != VAR_DECL
1945 || !DECL_VTABLE_OR_VTT_P (decl));
1947 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1949 /* Local statics and classes get the visibility of their
1950 containing function by default, except that
1951 -fvisibility-inlines-hidden doesn't affect them. */
1952 tree fn = DECL_CONTEXT (decl);
1953 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1955 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1956 DECL_VISIBILITY_SPECIFIED (decl) =
1957 DECL_VISIBILITY_SPECIFIED (fn);
1960 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1962 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1963 but have no TEMPLATE_INFO, so don't try to check it. */
1966 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1967 && flag_visibility_ms_compat)
1969 /* Under -fvisibility-ms-compat, types are visible by default,
1970 even though their contents aren't. */
1971 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1972 int underlying_vis = type_visibility (underlying_type);
1973 if (underlying_vis == VISIBILITY_ANON
1974 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1975 constrain_visibility (decl, underlying_vis);
1977 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1979 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1981 /* tinfo visibility is based on the type it's for. */
1982 constrain_visibility
1983 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1985 /* Give the target a chance to override the visibility associated
1987 if (TREE_PUBLIC (decl)
1988 && !DECL_REALLY_EXTERN (decl)
1989 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
1990 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
1991 targetm.cxx.determine_class_data_visibility (decl);
1993 else if (use_template)
1994 /* Template instantiations and specializations get visibility based
1995 on their template unless they override it with an attribute. */;
1996 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1998 /* Set default visibility to whatever the user supplied with
1999 #pragma GCC visibility or a namespace visibility attribute. */
2000 DECL_VISIBILITY (decl) = default_visibility;
2001 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2007 /* If the specialization doesn't specify visibility, use the
2008 visibility from the template. */
2009 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2010 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2011 : DECL_TEMPLATE_INFO (decl));
2012 tree args = TI_ARGS (tinfo);
2014 if (args != error_mark_node)
2016 int depth = TMPL_ARGS_DEPTH (args);
2017 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2019 if (!DECL_VISIBILITY_SPECIFIED (decl))
2021 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2022 DECL_VISIBILITY_SPECIFIED (decl)
2023 = DECL_VISIBILITY_SPECIFIED (pattern);
2026 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2027 if (args && depth > template_class_depth (class_type))
2028 /* Limit visibility based on its template arguments. */
2029 constrain_visibility_for_template (decl, args);
2034 determine_visibility_from_class (decl, class_type);
2036 if (decl_anon_ns_mem_p (decl))
2037 /* Names in an anonymous namespace get internal linkage.
2038 This might change once we implement export. */
2039 constrain_visibility (decl, VISIBILITY_ANON);
2040 else if (TREE_CODE (decl) != TYPE_DECL)
2042 /* Propagate anonymity from type to decl. */
2043 int tvis = type_visibility (TREE_TYPE (decl));
2044 if (tvis == VISIBILITY_ANON
2045 || ! DECL_VISIBILITY_SPECIFIED (decl))
2046 constrain_visibility (decl, tvis);
2050 /* By default, static data members and function members receive
2051 the visibility of their containing class. */
2054 determine_visibility_from_class (tree decl, tree class_type)
2056 if (DECL_VISIBILITY_SPECIFIED (decl))
2059 if (visibility_options.inlines_hidden
2060 /* Don't do this for inline templates; specializations might not be
2061 inline, and we don't want them to inherit the hidden
2062 visibility. We'll set it here for all inline instantiations. */
2063 && !processing_template_decl
2064 && TREE_CODE (decl) == FUNCTION_DECL
2065 && DECL_DECLARED_INLINE_P (decl)
2066 && (! DECL_LANG_SPECIFIC (decl)
2067 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2068 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2071 /* Default to the class visibility. */
2072 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2073 DECL_VISIBILITY_SPECIFIED (decl)
2074 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2077 /* Give the target a chance to override the visibility associated
2079 if (TREE_CODE (decl) == VAR_DECL
2080 && (DECL_TINFO_P (decl)
2081 || (DECL_VTABLE_OR_VTT_P (decl)
2082 /* Construction virtual tables are not exported because
2083 they cannot be referred to from other object files;
2084 their name is not standardized by the ABI. */
2085 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2086 && TREE_PUBLIC (decl)
2087 && !DECL_REALLY_EXTERN (decl)
2088 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2089 targetm.cxx.determine_class_data_visibility (decl);
2092 /* Constrain the visibility of a class TYPE based on the visibility of its
2093 field types. Warn if any fields require lesser visibility. */
2096 constrain_class_visibility (tree type)
2102 int vis = type_visibility (type);
2104 if (vis == VISIBILITY_ANON
2105 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2108 /* Don't warn about visibility if the class has explicit visibility. */
2109 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2110 vis = VISIBILITY_INTERNAL;
2112 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2113 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2115 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2116 int subvis = type_visibility (ftype);
2118 if (subvis == VISIBILITY_ANON)
2120 if (!in_main_input_context ())
2122 %qT has a field %qD whose type uses the anonymous namespace",
2125 else if (MAYBE_CLASS_TYPE_P (ftype)
2126 && vis < VISIBILITY_HIDDEN
2127 && subvis >= VISIBILITY_HIDDEN)
2128 warning (OPT_Wattributes, "\
2129 %qT declared with greater visibility than the type of its field %qD",
2133 binfo = TYPE_BINFO (type);
2134 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2136 int subvis = type_visibility (TREE_TYPE (t));
2138 if (subvis == VISIBILITY_ANON)
2140 if (!in_main_input_context())
2142 %qT has a base %qT whose type uses the anonymous namespace",
2143 type, TREE_TYPE (t));
2145 else if (vis < VISIBILITY_HIDDEN
2146 && subvis >= VISIBILITY_HIDDEN)
2147 warning (OPT_Wattributes, "\
2148 %qT declared with greater visibility than its base %qT",
2149 type, TREE_TYPE (t));
2153 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2154 for DECL has not already been determined, do so now by setting
2155 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2156 function is called entities with vague linkage whose definitions
2157 are available must have TREE_PUBLIC set.
2159 If this function decides to place DECL in COMDAT, it will set
2160 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2161 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2162 callers defer that decision until it is clear that DECL is actually
2166 import_export_decl (tree decl)
2171 tree class_type = NULL_TREE;
2173 if (DECL_INTERFACE_KNOWN (decl))
2176 /* We cannot determine what linkage to give to an entity with vague
2177 linkage until the end of the file. For example, a virtual table
2178 for a class will be defined if and only if the key method is
2179 defined in this translation unit. As a further example, consider
2180 that when compiling a translation unit that uses PCH file with
2181 "-frepo" it would be incorrect to make decisions about what
2182 entities to emit when building the PCH; those decisions must be
2183 delayed until the repository information has been processed. */
2184 gcc_assert (at_eof);
2185 /* Object file linkage for explicit instantiations is handled in
2186 mark_decl_instantiated. For static variables in functions with
2187 vague linkage, maybe_commonize_var is used.
2189 Therefore, the only declarations that should be provided to this
2190 function are those with external linkage that are:
2192 * implicit instantiations of function templates
2196 * implicit instantiations of static data members of class
2203 Furthermore, all entities that reach this point must have a
2204 definition available in this translation unit.
2206 The following assertions check these conditions. */
2207 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2208 || TREE_CODE (decl) == VAR_DECL);
2209 /* Any code that creates entities with TREE_PUBLIC cleared should
2210 also set DECL_INTERFACE_KNOWN. */
2211 gcc_assert (TREE_PUBLIC (decl));
2212 if (TREE_CODE (decl) == FUNCTION_DECL)
2213 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2214 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2215 || DECL_DECLARED_INLINE_P (decl));
2217 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2218 || DECL_VTABLE_OR_VTT_P (decl)
2219 || DECL_TINFO_P (decl));
2220 /* Check that a definition of DECL is available in this translation
2222 gcc_assert (!DECL_REALLY_EXTERN (decl));
2224 /* Assume that DECL will not have COMDAT linkage. */
2226 /* Assume that DECL will not be imported into this translation
2230 /* See if the repository tells us whether or not to emit DECL in
2231 this translation unit. */
2232 emit_p = repo_emit_p (decl);
2235 else if (emit_p == 1)
2237 /* The repository indicates that this entity should be defined
2238 here. Make sure the back end honors that request. */
2239 if (TREE_CODE (decl) == VAR_DECL)
2241 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2242 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2245 FOR_EACH_CLONE (clone, decl)
2246 mark_needed (clone);
2250 /* Output the definition as an ordinary strong definition. */
2251 DECL_EXTERNAL (decl) = 0;
2252 DECL_INTERFACE_KNOWN (decl) = 1;
2257 /* We have already decided what to do with this DECL; there is no
2258 need to check anything further. */
2260 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2262 class_type = DECL_CONTEXT (decl);
2263 import_export_class (class_type);
2264 if (TYPE_FOR_JAVA (class_type))
2266 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2267 && CLASSTYPE_INTERFACE_ONLY (class_type))
2269 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2270 && !CLASSTYPE_USE_TEMPLATE (class_type)
2271 && CLASSTYPE_KEY_METHOD (class_type)
2272 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2273 /* The ABI requires that all virtual tables be emitted with
2274 COMDAT linkage. However, on systems where COMDAT symbols
2275 don't show up in the table of contents for a static
2276 archive, or on systems without weak symbols (where we
2277 approximate COMDAT linkage by using internal linkage), the
2278 linker will report errors about undefined symbols because
2279 it will not see the virtual table definition. Therefore,
2280 in the case that we know that the virtual table will be
2281 emitted in only one translation unit, we make the virtual
2282 table an ordinary definition with external linkage. */
2283 DECL_EXTERNAL (decl) = 0;
2284 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2286 /* CLASS_TYPE is being exported from this translation unit,
2287 so DECL should be defined here. */
2288 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2289 /* If a class is declared in a header with the "extern
2290 template" extension, then it will not be instantiated,
2291 even in translation units that would normally require
2292 it. Often such classes are explicitly instantiated in
2293 one translation unit. Therefore, the explicit
2294 instantiation must be made visible to other translation
2296 DECL_EXTERNAL (decl) = 0;
2299 /* The generic C++ ABI says that class data is always
2300 COMDAT, even if there is a key function. Some
2301 variants (e.g., the ARM EABI) says that class data
2302 only has COMDAT linkage if the class data might be
2303 emitted in more than one translation unit. When the
2304 key method can be inline and is inline, we still have
2305 to arrange for comdat even though
2306 class_data_always_comdat is false. */
2307 if (!CLASSTYPE_KEY_METHOD (class_type)
2308 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2309 || targetm.cxx.class_data_always_comdat ())
2311 /* The ABI requires COMDAT linkage. Normally, we
2312 only emit COMDAT things when they are needed;
2313 make sure that we realize that this entity is
2320 else if (!flag_implicit_templates
2321 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2326 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2328 tree type = TREE_TYPE (DECL_NAME (decl));
2329 if (CLASS_TYPE_P (type))
2332 import_export_class (type);
2333 if (CLASSTYPE_INTERFACE_KNOWN (type)
2334 && TYPE_POLYMORPHIC_P (type)
2335 && CLASSTYPE_INTERFACE_ONLY (type)
2336 /* If -fno-rtti was specified, then we cannot be sure
2337 that RTTI information will be emitted with the
2338 virtual table of the class, so we must emit it
2339 wherever it is used. */
2344 if (CLASSTYPE_INTERFACE_KNOWN (type)
2345 && !CLASSTYPE_INTERFACE_ONLY (type))
2347 comdat_p = (targetm.cxx.class_data_always_comdat ()
2348 || (CLASSTYPE_KEY_METHOD (type)
2349 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2354 DECL_EXTERNAL (decl) = 0;
2364 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2365 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2367 /* DECL is an implicit instantiation of a function or static
2369 if ((flag_implicit_templates
2370 && !flag_use_repository)
2371 || (flag_implicit_inline_templates
2372 && TREE_CODE (decl) == FUNCTION_DECL
2373 && DECL_DECLARED_INLINE_P (decl)))
2376 /* If we are not implicitly generating templates, then mark
2377 this entity as undefined in this translation unit. */
2380 else if (DECL_FUNCTION_MEMBER_P (decl))
2382 if (!DECL_DECLARED_INLINE_P (decl))
2384 tree ctype = DECL_CONTEXT (decl);
2385 import_export_class (ctype);
2386 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2388 DECL_NOT_REALLY_EXTERN (decl)
2389 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2390 || (DECL_DECLARED_INLINE_P (decl)
2391 && ! flag_implement_inlines
2392 && !DECL_VINDEX (decl)));
2394 if (!DECL_NOT_REALLY_EXTERN (decl))
2395 DECL_EXTERNAL (decl) = 1;
2397 /* Always make artificials weak. */
2398 if (DECL_ARTIFICIAL (decl) && flag_weak)
2401 maybe_make_one_only (decl);
2412 /* If we are importing DECL into this translation unit, mark is
2413 an undefined here. */
2414 DECL_EXTERNAL (decl) = 1;
2415 DECL_NOT_REALLY_EXTERN (decl) = 0;
2419 /* If we decided to put DECL in COMDAT, mark it accordingly at
2421 comdat_linkage (decl);
2424 DECL_INTERFACE_KNOWN (decl) = 1;
2427 /* Return an expression that performs the destruction of DECL, which
2428 must be a VAR_DECL whose type has a non-trivial destructor, or is
2429 an array whose (innermost) elements have a non-trivial destructor. */
2432 build_cleanup (tree decl)
2435 tree type = TREE_TYPE (decl);
2437 /* This function should only be called for declarations that really
2438 require cleanups. */
2439 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2441 /* Treat all objects with destructors as used; the destructor may do
2442 something substantive. */
2445 if (TREE_CODE (type) == ARRAY_TYPE)
2448 temp = build_address (decl);
2449 temp = build_delete (TREE_TYPE (temp), temp,
2450 sfk_complete_destructor,
2451 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2455 /* Returns the initialization guard variable for the variable DECL,
2456 which has static storage duration. */
2459 get_guard (tree decl)
2464 sname = mangle_guard_variable (decl);
2465 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2470 /* We use a type that is big enough to contain a mutex as well
2471 as an integer counter. */
2472 guard_type = targetm.cxx.guard_type ();
2473 guard = build_decl (VAR_DECL, sname, guard_type);
2475 /* The guard should have the same linkage as what it guards. */
2476 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2477 TREE_STATIC (guard) = TREE_STATIC (decl);
2478 DECL_COMMON (guard) = DECL_COMMON (decl);
2479 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2480 if (TREE_PUBLIC (decl))
2481 DECL_WEAK (guard) = DECL_WEAK (decl);
2482 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2483 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2485 DECL_ARTIFICIAL (guard) = 1;
2486 DECL_IGNORED_P (guard) = 1;
2487 TREE_USED (guard) = 1;
2488 pushdecl_top_level_and_finish (guard, NULL_TREE);
2493 /* Return those bits of the GUARD variable that should be set when the
2494 guarded entity is actually initialized. */
2497 get_guard_bits (tree guard)
2499 if (!targetm.cxx.guard_mask_bit ())
2501 /* We only set the first byte of the guard, in order to leave room
2502 for a mutex in the high-order bits. */
2503 guard = build1 (ADDR_EXPR,
2504 build_pointer_type (TREE_TYPE (guard)),
2506 guard = build1 (NOP_EXPR,
2507 build_pointer_type (char_type_node),
2509 guard = build1 (INDIRECT_REF, char_type_node, guard);
2515 /* Return an expression which determines whether or not the GUARD
2516 variable has already been initialized. */
2519 get_guard_cond (tree guard)
2523 /* Check to see if the GUARD is zero. */
2524 guard = get_guard_bits (guard);
2526 /* Mask off all but the low bit. */
2527 if (targetm.cxx.guard_mask_bit ())
2529 guard_value = integer_one_node;
2530 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2531 guard_value = convert (TREE_TYPE (guard), guard_value);
2532 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value,
2533 tf_warning_or_error);
2536 guard_value = integer_zero_node;
2537 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2538 guard_value = convert (TREE_TYPE (guard), guard_value);
2539 return cp_build_binary_op (EQ_EXPR, guard, guard_value,
2540 tf_warning_or_error);
2543 /* Return an expression which sets the GUARD variable, indicating that
2544 the variable being guarded has been initialized. */
2547 set_guard (tree guard)
2551 /* Set the GUARD to one. */
2552 guard = get_guard_bits (guard);
2553 guard_init = integer_one_node;
2554 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2555 guard_init = convert (TREE_TYPE (guard), guard_init);
2556 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2557 tf_warning_or_error);
2560 /* Start the process of running a particular set of global constructors
2561 or destructors. Subroutine of do_[cd]tors. */
2564 start_objects (int method_type, int initp)
2570 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2572 if (initp != DEFAULT_INIT_PRIORITY)
2582 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2585 sprintf (type, "%c", method_type);
2587 fndecl = build_lang_decl (FUNCTION_DECL,
2588 get_file_function_name (type),
2589 build_function_type (void_type_node,
2591 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2593 TREE_PUBLIC (current_function_decl) = 0;
2595 /* Mark as artificial because it's not explicitly in the user's
2597 DECL_ARTIFICIAL (current_function_decl) = 1;
2599 /* Mark this declaration as used to avoid spurious warnings. */
2600 TREE_USED (current_function_decl) = 1;
2602 /* Mark this function as a global constructor or destructor. */
2603 if (method_type == 'I')
2604 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2606 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2607 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2609 body = begin_compound_stmt (BCS_FN_BODY);
2614 /* Finish the process of running a particular set of global constructors
2615 or destructors. Subroutine of do_[cd]tors. */
2618 finish_objects (int method_type, int initp, tree body)
2623 finish_compound_stmt (body);
2624 fn = finish_function (0);
2626 if (method_type == 'I')
2628 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2629 decl_init_priority_insert (fn, initp);
2633 DECL_STATIC_DESTRUCTOR (fn) = 1;
2634 decl_fini_priority_insert (fn, initp);
2637 expand_or_defer_fn (fn);
2640 /* The names of the parameters to the function created to handle
2641 initializations and destructions for objects with static storage
2643 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2644 #define PRIORITY_IDENTIFIER "__priority"
2646 /* The name of the function we create to handle initializations and
2647 destructions for objects with static storage duration. */
2648 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2650 /* The declaration for the __INITIALIZE_P argument. */
2651 static GTY(()) tree initialize_p_decl;
2653 /* The declaration for the __PRIORITY argument. */
2654 static GTY(()) tree priority_decl;
2656 /* The declaration for the static storage duration function. */
2657 static GTY(()) tree ssdf_decl;
2659 /* All the static storage duration functions created in this
2660 translation unit. */
2661 static GTY(()) VEC(tree,gc) *ssdf_decls;
2663 /* A map from priority levels to information about that priority
2664 level. There may be many such levels, so efficient lookup is
2666 static splay_tree priority_info_map;
2668 /* Begins the generation of the function that will handle all
2669 initialization and destruction of objects with static storage
2670 duration. The function generated takes two parameters of type
2671 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2672 nonzero, it performs initializations. Otherwise, it performs
2673 destructions. It only performs those initializations or
2674 destructions with the indicated __PRIORITY. The generated function
2677 It is assumed that this function will only be called once per
2678 translation unit. */
2681 start_static_storage_duration_function (unsigned count)
2686 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2688 /* Create the identifier for this function. It will be of the form
2689 SSDF_IDENTIFIER_<number>. */
2690 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2692 /* Create the parameters. */
2693 parm_types = void_list_node;
2694 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2695 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2696 type = build_function_type (void_type_node, parm_types);
2698 /* Create the FUNCTION_DECL itself. */
2699 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2700 get_identifier (id),
2702 TREE_PUBLIC (ssdf_decl) = 0;
2703 DECL_ARTIFICIAL (ssdf_decl) = 1;
2705 /* Put this function in the list of functions to be called from the
2706 static constructors and destructors. */
2709 ssdf_decls = VEC_alloc (tree, gc, 32);
2711 /* Take this opportunity to initialize the map from priority
2712 numbers to information about that priority level. */
2713 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2714 /*delete_key_fn=*/0,
2715 /*delete_value_fn=*/
2716 (splay_tree_delete_value_fn) &free);
2718 /* We always need to generate functions for the
2719 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2720 priorities later, we'll be sure to find the
2721 DEFAULT_INIT_PRIORITY. */
2722 get_priority_info (DEFAULT_INIT_PRIORITY);
2725 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2727 /* Create the argument list. */
2728 initialize_p_decl = cp_build_parm_decl
2729 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2730 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2731 TREE_USED (initialize_p_decl) = 1;
2732 priority_decl = cp_build_parm_decl
2733 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2734 DECL_CONTEXT (priority_decl) = ssdf_decl;
2735 TREE_USED (priority_decl) = 1;
2737 TREE_CHAIN (initialize_p_decl) = priority_decl;
2738 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2740 /* Put the function in the global scope. */
2741 pushdecl (ssdf_decl);
2743 /* Start the function itself. This is equivalent to declaring the
2746 static void __ssdf (int __initialize_p, init __priority_p);
2748 It is static because we only need to call this function from the
2749 various constructor and destructor functions for this module. */
2750 start_preparsed_function (ssdf_decl,
2751 /*attrs=*/NULL_TREE,
2754 /* Set up the scope of the outermost block in the function. */
2755 body = begin_compound_stmt (BCS_FN_BODY);
2760 /* Finish the generation of the function which performs initialization
2761 and destruction of objects with static storage duration. After
2762 this point, no more such objects can be created. */
2765 finish_static_storage_duration_function (tree body)
2767 /* Close out the function. */
2768 finish_compound_stmt (body);
2769 expand_or_defer_fn (finish_function (0));
2772 /* Return the information about the indicated PRIORITY level. If no
2773 code to handle this level has yet been generated, generate the
2774 appropriate prologue. */
2776 static priority_info
2777 get_priority_info (int priority)
2782 n = splay_tree_lookup (priority_info_map,
2783 (splay_tree_key) priority);
2786 /* Create a new priority information structure, and insert it
2788 pi = XNEW (struct priority_info_s);
2789 pi->initializations_p = 0;
2790 pi->destructions_p = 0;
2791 splay_tree_insert (priority_info_map,
2792 (splay_tree_key) priority,
2793 (splay_tree_value) pi);
2796 pi = (priority_info) n->value;
2801 /* The effective initialization priority of a DECL. */
2803 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2804 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2805 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2807 /* Whether a DECL needs a guard to protect it against multiple
2810 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2811 || DECL_ONE_ONLY (decl) \
2812 || DECL_WEAK (decl)))
2814 /* Called from one_static_initialization_or_destruction(),
2816 Walks the initializer list of a global variable and looks for
2817 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2818 and that have their DECL_CONTEXT() == NULL.
2819 For each such temporary variable, set their DECL_CONTEXT() to
2820 the current function. This is necessary because otherwise
2821 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2822 when trying to refer to a temporary variable that does not have
2823 it's DECL_CONTECT() properly set. */
2825 fix_temporary_vars_context_r (tree *node,
2826 int *unused ATTRIBUTE_UNUSED,
2827 void *unused1 ATTRIBUTE_UNUSED)
2829 gcc_assert (current_function_decl);
2831 if (TREE_CODE (*node) == BIND_EXPR)
2835 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2836 if (TREE_CODE (var) == VAR_DECL
2838 && DECL_ARTIFICIAL (var)
2839 && !DECL_CONTEXT (var))
2840 DECL_CONTEXT (var) = current_function_decl;
2846 /* Set up to handle the initialization or destruction of DECL. If
2847 INITP is nonzero, we are initializing the variable. Otherwise, we
2848 are destroying it. */
2851 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2853 tree guard_if_stmt = NULL_TREE;
2856 /* If we are supposed to destruct and there's a trivial destructor,
2857 nothing has to be done. */
2859 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2862 /* Trick the compiler into thinking we are at the file and line
2863 where DECL was declared so that error-messages make sense, and so
2864 that the debugger will show somewhat sensible file and line
2866 input_location = DECL_SOURCE_LOCATION (decl);
2868 /* Make sure temporary variables in the initialiser all have
2869 their DECL_CONTEXT() set to a value different from NULL_TREE.
2870 This can happen when global variables initialisers are built.
2871 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2872 the temporary variables that might have been generated in the
2873 accompagning initialisers is NULL_TREE, meaning the variables have been
2874 declared in the global namespace.
2875 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2876 of the temporaries are set to the current function decl. */
2877 cp_walk_tree_without_duplicates (&init,
2878 fix_temporary_vars_context_r,
2885 Access control for implicit calls to the constructors,
2886 the conversion functions, or the destructor called to
2887 create and destroy a static data member is performed as
2888 if these calls appeared in the scope of the member's
2891 we pretend we are in a static member function of the class of
2892 which the DECL is a member. */
2893 if (member_p (decl))
2895 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2896 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2899 /* Assume we don't need a guard. */
2901 /* We need a guard if this is an object with external linkage that
2902 might be initialized in more than one place. (For example, a
2903 static data member of a template, when the data member requires
2905 if (NEEDS_GUARD_P (decl))
2909 guard = get_guard (decl);
2911 /* When using __cxa_atexit, we just check the GUARD as we would
2912 for a local static. */
2913 if (flag_use_cxa_atexit)
2915 /* When using __cxa_atexit, we never try to destroy
2916 anything from a static destructor. */
2918 guard_cond = get_guard_cond (guard);
2920 /* If we don't have __cxa_atexit, then we will be running
2921 destructors from .fini sections, or their equivalents. So,
2922 we need to know how many times we've tried to initialize this
2923 object. We do initializations only if the GUARD is zero,
2924 i.e., if we are the first to initialize the variable. We do
2925 destructions only if the GUARD is one, i.e., if we are the
2926 last to destroy the variable. */
2929 = cp_build_binary_op (EQ_EXPR,
2930 cp_build_unary_op (PREINCREMENT_EXPR,
2933 tf_warning_or_error),
2935 tf_warning_or_error);
2938 = cp_build_binary_op (EQ_EXPR,
2939 cp_build_unary_op (PREDECREMENT_EXPR,
2942 tf_warning_or_error),
2944 tf_warning_or_error);
2946 guard_if_stmt = begin_if_stmt ();
2947 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2951 /* If we're using __cxa_atexit, we have not already set the GUARD,
2952 so we must do so now. */
2953 if (guard && initp && flag_use_cxa_atexit)
2954 finish_expr_stmt (set_guard (guard));
2956 /* Perform the initialization or destruction. */
2960 finish_expr_stmt (init);
2962 /* If we're using __cxa_atexit, register a function that calls the
2963 destructor for the object. */
2964 if (flag_use_cxa_atexit)
2965 finish_expr_stmt (register_dtor_fn (decl));
2968 finish_expr_stmt (build_cleanup (decl));
2970 /* Finish the guard if-stmt, if necessary. */
2973 finish_then_clause (guard_if_stmt);
2974 finish_if_stmt (guard_if_stmt);
2977 /* Now that we're done with DECL we don't need to pretend to be a
2978 member of its class any longer. */
2979 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2980 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2983 /* Generate code to do the initialization or destruction of the decls in VARS,
2984 a TREE_LIST of VAR_DECL with static storage duration.
2985 Whether initialization or destruction is performed is specified by INITP. */
2988 do_static_initialization_or_destruction (tree vars, bool initp)
2990 tree node, init_if_stmt, cond;
2992 /* Build the outer if-stmt to check for initialization or destruction. */
2993 init_if_stmt = begin_if_stmt ();
2994 cond = initp ? integer_one_node : integer_zero_node;
2995 cond = cp_build_binary_op (EQ_EXPR,
2998 tf_warning_or_error);
2999 finish_if_stmt_cond (cond, init_if_stmt);
3003 tree decl = TREE_VALUE (node);
3004 tree priority_if_stmt;
3008 /* If we don't need a destructor, there's nothing to do. Avoid
3009 creating a possibly empty if-stmt. */
3010 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3012 node = TREE_CHAIN (node);
3016 /* Remember that we had an initialization or finalization at this
3018 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3019 pi = get_priority_info (priority);
3021 pi->initializations_p = 1;
3023 pi->destructions_p = 1;
3025 /* Conditionalize this initialization on being in the right priority
3026 and being initializing/finalizing appropriately. */
3027 priority_if_stmt = begin_if_stmt ();
3028 cond = cp_build_binary_op (EQ_EXPR,
3030 build_int_cst (NULL_TREE, priority),
3031 tf_warning_or_error);
3032 finish_if_stmt_cond (cond, priority_if_stmt);
3034 /* Process initializers with same priority. */
3036 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3037 node = TREE_CHAIN (node))
3038 /* Do one initialization or destruction. */
3039 one_static_initialization_or_destruction (TREE_VALUE (node),
3040 TREE_PURPOSE (node), initp);
3042 /* Finish up the priority if-stmt body. */
3043 finish_then_clause (priority_if_stmt);
3044 finish_if_stmt (priority_if_stmt);
3048 /* Finish up the init/destruct if-stmt body. */
3049 finish_then_clause (init_if_stmt);
3050 finish_if_stmt (init_if_stmt);
3053 /* VARS is a list of variables with static storage duration which may
3054 need initialization and/or finalization. Remove those variables
3055 that don't really need to be initialized or finalized, and return
3056 the resulting list. The order in which the variables appear in
3057 VARS is in reverse order of the order in which they should actually
3058 be initialized. The list we return is in the unreversed order;
3059 i.e., the first variable should be initialized first. */
3062 prune_vars_needing_no_initialization (tree *vars)
3065 tree result = NULL_TREE;
3070 tree decl = TREE_VALUE (t);
3071 tree init = TREE_PURPOSE (t);
3073 /* Deal gracefully with error. */
3074 if (decl == error_mark_node)
3076 var = &TREE_CHAIN (t);
3080 /* The only things that can be initialized are variables. */
3081 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3083 /* If this object is not defined, we don't need to do anything
3085 if (DECL_EXTERNAL (decl))
3087 var = &TREE_CHAIN (t);
3091 /* Also, if the initializer already contains errors, we can bail
3093 if (init && TREE_CODE (init) == TREE_LIST
3094 && value_member (error_mark_node, init))
3096 var = &TREE_CHAIN (t);
3100 /* This variable is going to need initialization and/or
3101 finalization, so we add it to the list. */
3102 *var = TREE_CHAIN (t);
3103 TREE_CHAIN (t) = result;
3110 /* Make sure we have told the back end about all the variables in
3114 write_out_vars (tree vars)
3118 for (v = vars; v; v = TREE_CHAIN (v))
3120 tree var = TREE_VALUE (v);
3121 if (!var_finalized_p (var))
3123 import_export_decl (var);
3124 rest_of_decl_compilation (var, 1, 1);
3129 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3130 (otherwise) that will initialize all global objects with static
3131 storage duration having the indicated PRIORITY. */
3134 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3143 input_location = *locus;
3145 /* Was: locus->line++; */
3147 /* We use `I' to indicate initialization and `D' to indicate
3149 function_key = constructor_p ? 'I' : 'D';
3151 /* We emit the function lazily, to avoid generating empty
3152 global constructors and destructors. */
3155 /* For Objective-C++, we may need to initialize metadata found in this module.
3156 This must be done _before_ any other static initializations. */
3157 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3158 && constructor_p && objc_static_init_needed_p ())
3160 body = start_objects (function_key, priority);
3161 objc_generate_static_init_call (NULL_TREE);
3164 /* Call the static storage duration function with appropriate
3166 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3168 /* Calls to pure or const functions will expand to nothing. */
3169 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3172 body = start_objects (function_key, priority);
3174 arguments = tree_cons (NULL_TREE,
3175 build_int_cst (NULL_TREE, priority),
3177 arguments = tree_cons (NULL_TREE,
3178 build_int_cst (NULL_TREE, constructor_p),
3180 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3181 tf_warning_or_error));
3185 /* Close out the function. */
3187 finish_objects (function_key, priority, body);
3190 /* Generate constructor and destructor functions for the priority
3194 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3196 location_t *locus = (location_t *) data;
3197 int priority = (int) n->key;
3198 priority_info pi = (priority_info) n->value;
3200 /* Generate the functions themselves, but only if they are really
3202 if (pi->initializations_p)
3203 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3204 if (pi->destructions_p)
3205 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3207 /* Keep iterating. */
3211 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3212 decls referenced from front-end specific constructs; it will be called
3213 only for language-specific tree nodes.
3215 Here we must deal with member pointers. */
3218 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3222 switch (TREE_CODE (t))
3225 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3226 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3229 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3230 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3233 if (DECL_VTABLE_OR_VTT_P (t))
3235 /* The ABI requires that all virtual tables be emitted
3236 whenever one of them is. */
3238 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3240 vtbl = TREE_CHAIN (vtbl))
3241 mark_decl_referenced (vtbl);
3243 else if (DECL_CONTEXT (t)
3244 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3245 /* If we need a static variable in a function, then we
3246 need the containing function. */
3247 mark_decl_referenced (DECL_CONTEXT (t));
3256 /* Java requires that we be able to reference a local address for a
3257 method, and not be confused by PLT entries. If hidden aliases are
3258 supported, emit one for each java function that we've emitted. */
3261 build_java_method_aliases (void)
3263 struct cgraph_node *node;
3265 #ifndef HAVE_GAS_HIDDEN
3269 for (node = cgraph_nodes; node ; node = node->next)
3271 tree fndecl = node->decl;
3273 if (TREE_ASM_WRITTEN (fndecl)
3274 && DECL_CONTEXT (fndecl)
3275 && TYPE_P (DECL_CONTEXT (fndecl))
3276 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3277 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3279 /* Mangle the name in a predictable way; we need to reference
3280 this from a java compiled object file. */
3281 tree oid, nid, alias;
3285 oid = DECL_ASSEMBLER_NAME (fndecl);
3286 oname = IDENTIFIER_POINTER (oid);
3287 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3288 nname = ACONCAT (("_ZGA", oname+2, NULL));
3289 nid = get_identifier (nname);
3291 alias = make_alias_for (fndecl, nid);
3292 TREE_PUBLIC (alias) = 1;
3293 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3295 assemble_alias (alias, oid);
3300 /* This routine is called at the end of compilation.
3301 Its job is to create all the code needed to initialize and
3302 destroy the global aggregates. We do the destruction
3303 first, since that way we only need to reverse the decls once. */
3306 cp_write_global_declarations (void)
3312 unsigned ssdf_count = 0;
3316 locus = input_location;
3319 /* Bad parse errors. Just forget about it. */
3320 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3324 c_common_write_pch ();
3326 /* FIXME - huh? was input_line -= 1;*/
3328 /* We now have to write out all the stuff we put off writing out.
3331 o Template specializations that we have not yet instantiated,
3332 but which are needed.
3333 o Initialization and destruction for non-local objects with
3334 static storage duration. (Local objects with static storage
3335 duration are initialized when their scope is first entered,
3336 and are cleaned up via atexit.)
3337 o Virtual function tables.
3339 All of these may cause others to be needed. For example,
3340 instantiating one function may cause another to be needed, and
3341 generating the initializer for an object may cause templates to be
3342 instantiated, etc., etc. */
3344 timevar_push (TV_VARCONST);
3346 emit_support_tinfos ();
3355 /* If there are templates that we've put off instantiating, do
3357 instantiate_pending_templates (retries);
3360 /* Write out virtual tables as required. Note that writing out
3361 the virtual table for a template class may cause the
3362 instantiation of members of that class. If we write out
3363 vtables then we remove the class from our list so we don't
3364 have to look at it again. */
3366 while (keyed_classes != NULL_TREE
3367 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3370 keyed_classes = TREE_CHAIN (keyed_classes);
3376 tree next = TREE_CHAIN (t);
3380 if (maybe_emit_vtables (TREE_VALUE (next)))
3383 TREE_CHAIN (t) = TREE_CHAIN (next);
3388 next = TREE_CHAIN (t);
3392 /* Write out needed type info variables. We have to be careful
3393 looping through unemitted decls, because emit_tinfo_decl may
3394 cause other variables to be needed. New elements will be
3395 appended, and we remove from the vector those that actually
3397 for (i = VEC_length (tree, unemitted_tinfo_decls);
3398 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3399 if (emit_tinfo_decl (t))
3402 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3405 /* The list of objects with static storage duration is built up
3406 in reverse order. We clear STATIC_AGGREGATES so that any new
3407 aggregates added during the initialization of these will be
3408 initialized in the correct order when we next come around the
3410 vars = prune_vars_needing_no_initialization (&static_aggregates);
3414 /* We need to start a new initialization function each time
3415 through the loop. That's because we need to know which
3416 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3417 isn't computed until a function is finished, and written
3418 out. That's a deficiency in the back end. When this is
3419 fixed, these initialization functions could all become
3420 inline, with resulting performance improvements. */
3423 /* Set the line and file, so that it is obviously not from
3425 input_location = locus;
3426 ssdf_body = start_static_storage_duration_function (ssdf_count);
3428 /* Make sure the back end knows about all the variables. */
3429 write_out_vars (vars);
3431 /* First generate code to do all the initializations. */
3433 do_static_initialization_or_destruction (vars, /*initp=*/true);
3435 /* Then, generate code to do all the destructions. Do these
3436 in reverse order so that the most recently constructed
3437 variable is the first destroyed. If we're using
3438 __cxa_atexit, then we don't need to do this; functions
3439 were registered at initialization time to destroy the
3441 if (!flag_use_cxa_atexit && vars)
3443 vars = nreverse (vars);
3444 do_static_initialization_or_destruction (vars, /*initp=*/false);
3449 /* Finish up the static storage duration function for this
3451 input_location = locus;
3452 finish_static_storage_duration_function (ssdf_body);
3454 /* All those initializations and finalizations might cause
3455 us to need more inline functions, more template
3456 instantiations, etc. */
3459 /* ??? was: locus.line++; */
3462 /* Go through the set of inline functions whose bodies have not
3463 been emitted yet. If out-of-line copies of these functions
3464 are required, emit them. */
3465 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3467 /* Does it need synthesizing? */
3468 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3469 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3471 /* Even though we're already at the top-level, we push
3472 there again. That way, when we pop back a few lines
3473 hence, all of our state is restored. Otherwise,
3474 finish_function doesn't clean things up, and we end
3475 up with CURRENT_FUNCTION_DECL set. */
3476 push_to_top_level ();
3477 /* The decl's location will mark where it was first
3478 needed. Save that so synthesize method can indicate
3479 where it was needed from, in case of error */
3480 input_location = DECL_SOURCE_LOCATION (decl);
3481 synthesize_method (decl);
3482 pop_from_top_level ();
3486 if (!gimple_body (decl))
3489 /* We lie to the back end, pretending that some functions
3490 are not defined when they really are. This keeps these
3491 functions from being put out unnecessarily. But, we must
3492 stop lying when the functions are referenced, or if they
3493 are not comdat since they need to be put out now. If
3494 DECL_INTERFACE_KNOWN, then we have already set
3495 DECL_EXTERNAL appropriately, so there's no need to check
3496 again, and we do not want to clear DECL_EXTERNAL if a
3497 previous call to import_export_decl set it.
3499 This is done in a separate for cycle, because if some
3500 deferred function is contained in another deferred
3501 function later in deferred_fns varray,
3502 rest_of_compilation would skip this function and we
3503 really cannot expand the same function twice. */
3504 import_export_decl (decl);
3505 if (DECL_NOT_REALLY_EXTERN (decl)
3506 && DECL_INITIAL (decl)
3507 && decl_needed_p (decl))
3508 DECL_EXTERNAL (decl) = 0;
3510 /* If we're going to need to write this function out, and
3511 there's already a body for it, create RTL for it now.
3512 (There might be no body if this is a method we haven't
3513 gotten around to synthesizing yet.) */
3514 if (!DECL_EXTERNAL (decl)
3515 && decl_needed_p (decl)
3516 && !TREE_ASM_WRITTEN (decl)
3517 && !cgraph_node (decl)->local.finalized)
3519 /* We will output the function; no longer consider it in this
3521 DECL_DEFER_OUTPUT (decl) = 0;
3522 /* Generate RTL for this function now that we know we
3524 expand_or_defer_fn (decl);
3525 /* If we're compiling -fsyntax-only pretend that this
3526 function has been written out so that we don't try to
3528 if (flag_syntax_only)
3529 TREE_ASM_WRITTEN (decl) = 1;
3534 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3537 /* Static data members are just like namespace-scope globals. */
3538 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3540 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3541 /* Don't write it out if we haven't seen a definition. */
3542 || DECL_IN_AGGR_P (decl))
3544 import_export_decl (decl);
3545 /* If this static data member is needed, provide it to the
3547 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3548 DECL_EXTERNAL (decl) = 0;
3550 if (VEC_length (tree, pending_statics) != 0
3551 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3552 VEC_length (tree, pending_statics)))
3559 /* All used inline functions must have a definition at this point. */
3560 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3562 if (/* Check online inline functions that were actually used. */
3563 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3564 /* If the definition actually was available here, then the
3565 fact that the function was not defined merely represents
3566 that for some reason (use of a template repository,
3567 #pragma interface, etc.) we decided not to emit the
3569 && !DECL_INITIAL (decl)
3570 /* An explicit instantiation can be used to specify
3571 that the body is in another unit. It will have
3572 already verified there was a definition. */
3573 && !DECL_EXPLICIT_INSTANTIATION (decl))
3575 warning (0, "inline function %q+D used but never defined", decl);
3576 /* Avoid a duplicate warning from check_global_declaration_1. */
3577 TREE_NO_WARNING (decl) = 1;
3581 /* We give C linkage to static constructors and destructors. */
3582 push_lang_context (lang_name_c);
3584 /* Generate initialization and destruction functions for all
3585 priorities for which they are required. */
3586 if (priority_info_map)
3587 splay_tree_foreach (priority_info_map,
3588 generate_ctor_and_dtor_functions_for_priority,
3590 else if (c_dialect_objc () && objc_static_init_needed_p ())
3591 /* If this is obj-c++ and we need a static init, call
3592 generate_ctor_or_dtor_function. */
3593 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3594 DEFAULT_INIT_PRIORITY, &locus);
3596 /* We're done with the splay-tree now. */
3597 if (priority_info_map)
3598 splay_tree_delete (priority_info_map);
3600 /* Generate any missing aliases. */
3601 maybe_apply_pending_pragma_weaks ();
3603 /* We're done with static constructors, so we can go back to "C++"
3605 pop_lang_context ();
3607 cgraph_finalize_compilation_unit ();
3610 /* Now, issue warnings about static, but not defined, functions,
3611 etc., and emit debugging information. */
3612 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3613 if (VEC_length (tree, pending_statics) != 0)
3615 check_global_declarations (VEC_address (tree, pending_statics),
3616 VEC_length (tree, pending_statics));
3617 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3618 VEC_length (tree, pending_statics));
3621 /* Generate hidden aliases for Java. */
3622 build_java_method_aliases ();
3626 /* The entire file is now complete. If requested, dump everything
3630 FILE *stream = dump_begin (TDI_tu, &flags);
3634 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3635 dump_end (TDI_tu, stream);
3639 timevar_pop (TV_VARCONST);
3641 if (flag_detailed_statistics)
3643 dump_tree_statistics ();
3644 dump_time_statistics ();
3646 input_location = locus;
3648 #ifdef ENABLE_CHECKING
3649 validate_conversion_obstack ();
3650 #endif /* ENABLE_CHECKING */
3653 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3654 function to call in parse-tree form; it has not yet been
3655 semantically analyzed. ARGS are the arguments to the function.
3656 They have already been semantically analyzed. */
3659 build_offset_ref_call_from_tree (tree fn, tree args)
3668 object = TREE_OPERAND (fn, 0);
3670 if (processing_template_decl)
3672 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3673 || TREE_CODE (fn) == MEMBER_REF);
3674 if (type_dependent_expression_p (fn)
3675 || any_type_dependent_arguments_p (args))
3676 return build_nt_call_list (fn, args);
3678 /* Transform the arguments and add the implicit "this"
3679 parameter. That must be done before the FN is transformed
3680 because we depend on the form of FN. */
3681 args = build_non_dependent_args (args);
3682 object = build_non_dependent_expr (object);
3683 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3684 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3685 args = tree_cons (NULL_TREE, object, args);
3686 /* Now that the arguments are done, transform FN. */
3687 fn = build_non_dependent_expr (fn);
3690 /* A qualified name corresponding to a bound pointer-to-member is
3691 represented as an OFFSET_REF:
3693 struct B { void g(); };
3695 void B::g() { (this->*p)(); } */
3696 if (TREE_CODE (fn) == OFFSET_REF)
3698 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3699 tf_warning_or_error);
3700 fn = TREE_OPERAND (fn, 1);
3701 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3702 args = tree_cons (NULL_TREE, object_addr, args);
3705 expr = cp_build_function_call (fn, args, tf_warning_or_error);
3706 if (processing_template_decl && expr != error_mark_node)
3707 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3713 check_default_args (tree x)
3715 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3716 bool saw_def = false;
3717 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3718 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3720 if (TREE_PURPOSE (arg))
3724 error ("default argument missing for parameter %P of %q+#D", i, x);
3725 TREE_PURPOSE (arg) = error_mark_node;
3730 /* Return true if function DECL can be inlined. This is used to force
3731 instantiation of methods that might be interesting for inlining. */
3733 possibly_inlined_p (tree decl)
3735 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3736 if (DECL_UNINLINABLE (decl))
3739 return DECL_DECLARED_INLINE_P (decl);
3740 /* When optimizing, we might inline everything when flatten
3741 attribute or heuristics inlining for size or autoinlining
3746 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3747 If DECL is a specialization or implicitly declared class member,
3748 generate the actual definition. */
3751 mark_used (tree decl)
3753 HOST_WIDE_INT saved_processing_template_decl = 0;
3755 /* If DECL is a BASELINK for a single function, then treat it just
3756 like the DECL for the function. Otherwise, if the BASELINK is
3757 for an overloaded function, we don't know which function was
3758 actually used until after overload resolution. */
3759 if (TREE_CODE (decl) == BASELINK)
3761 decl = BASELINK_FUNCTIONS (decl);
3762 if (really_overloaded_fn (decl))
3764 decl = OVL_CURRENT (decl);
3767 TREE_USED (decl) = 1;
3768 if (DECL_CLONED_FUNCTION_P (decl))
3769 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3770 /* If we don't need a value, then we don't need to synthesize DECL. */
3771 if (skip_evaluation)
3773 /* Normally, we can wait until instantiation-time to synthesize
3774 DECL. However, if DECL is a static data member initialized with
3775 a constant, we need the value right now because a reference to
3776 such a data member is not value-dependent. */
3777 if (TREE_CODE (decl) == VAR_DECL
3778 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3779 && DECL_CLASS_SCOPE_P (decl))
3781 /* Don't try to instantiate members of dependent types. We
3782 cannot just use dependent_type_p here because this function
3783 may be called from fold_non_dependent_expr, and then we may
3784 see dependent types, even though processing_template_decl
3786 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3787 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3789 /* Pretend that we are not in a template, even if we are, so
3790 that the static data member initializer will be processed. */
3791 saved_processing_template_decl = processing_template_decl;
3792 processing_template_decl = 0;
3795 if (processing_template_decl)
3798 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3799 && !TREE_ASM_WRITTEN (decl))
3800 /* Remember it, so we can check it was defined. */
3802 if (DECL_DEFERRED_FN (decl))
3805 /* Remember the current location for a function we will end up
3806 synthesizing. Then we can inform the user where it was
3807 required in the case of error. */
3808 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3809 && !DECL_THUNK_P (decl))
3810 DECL_SOURCE_LOCATION (decl) = input_location;
3812 note_vague_linkage_fn (decl);
3815 assemble_external (decl);
3817 /* Is it a synthesized method that needs to be synthesized? */
3818 if (TREE_CODE (decl) == FUNCTION_DECL
3819 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3820 && DECL_DEFAULTED_FN (decl)
3821 && !DECL_THUNK_P (decl)
3822 && ! DECL_INITIAL (decl)
3823 /* Kludge: don't synthesize for default args. Unfortunately this
3824 rules out initializers of namespace-scoped objects too, but
3825 it's sort-of ok if the implicit ctor or dtor decl keeps
3826 pointing to the class location. */
3827 && current_function_decl)
3829 synthesize_method (decl);
3830 /* If we've already synthesized the method we don't need to
3831 do the instantiation test below. */
3833 else if (TREE_CODE (decl) == FUNCTION_DECL
3834 && DECL_DELETED_FN (decl))
3836 error ("deleted function %q+D", decl);
3837 error ("used here");
3839 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3840 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3841 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3842 || (TREE_CODE (decl) == FUNCTION_DECL
3843 && possibly_inlined_p
3844 (DECL_TEMPLATE_RESULT (
3845 template_for_substitution (decl))))
3846 /* We need to instantiate static data members so that there
3847 initializers are available in integral constant
3849 || (TREE_CODE (decl) == VAR_DECL
3850 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3851 /* If this is a function or variable that is an instance of some
3852 template, we now know that we will need to actually do the
3853 instantiation. We check that DECL is not an explicit
3854 instantiation because that is not checked in instantiate_decl.
3856 We put off instantiating functions in order to improve compile
3857 times. Maintaining a stack of active functions is expensive,
3858 and the inliner knows to instantiate any functions it might
3859 need. Therefore, we always try to defer instantiation. */
3860 instantiate_decl (decl, /*defer_ok=*/true,
3861 /*expl_inst_class_mem_p=*/false);
3863 processing_template_decl = saved_processing_template_decl;
3866 #include "gt-cp-decl2.h"