1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
56 extern cpp_reader *parse_in;
58 /* This structure contains information about the initializations
59 and/or destructions required for a particular priority level. */
60 typedef struct priority_info_s {
61 /* Nonzero if there have been any initializations at this priority
62 throughout the translation unit. */
63 int initializations_p;
64 /* Nonzero if there have been any destructions at this priority
65 throughout the translation unit. */
69 static void mark_vtable_entries (tree);
70 static bool maybe_emit_vtables (tree);
71 static bool acceptable_java_type (tree);
72 static tree start_objects (int, int);
73 static void finish_objects (int, int, tree);
74 static tree start_static_storage_duration_function (unsigned);
75 static void finish_static_storage_duration_function (tree);
76 static priority_info get_priority_info (int);
77 static void do_static_initialization_or_destruction (tree, bool);
78 static void one_static_initialization_or_destruction (tree, tree, bool);
79 static void generate_ctor_or_dtor_function (bool, int, location_t *);
80 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
82 static tree prune_vars_needing_no_initialization (tree *);
83 static void write_out_vars (tree);
84 static void import_export_class (tree);
85 static tree get_guard_bits (tree);
86 static void determine_visibility_from_class (tree, tree);
88 /* A list of static class variables. This is needed, because a
89 static class variable can be declared inside the class without
90 an initializer, and then initialized, statically, outside the class. */
91 static GTY(()) VEC(tree,gc) *pending_statics;
93 /* A list of functions which were declared inline, but which we
94 may need to emit outline anyway. */
95 static GTY(()) VEC(tree,gc) *deferred_fns;
97 /* Nonzero if we're done parsing and into end-of-file activities. */
103 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
104 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
105 that apply to the function). */
108 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
113 if (fntype == error_mark_node || ctype == error_mark_node)
114 return error_mark_node;
116 type_quals = quals & ~TYPE_QUAL_RESTRICT;
117 ctype = cp_build_qualified_type (ctype, type_quals);
118 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
119 (TREE_CODE (fntype) == METHOD_TYPE
120 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
121 : TYPE_ARG_TYPES (fntype)));
122 raises = TYPE_RAISES_EXCEPTIONS (fntype);
124 fntype = build_exception_variant (fntype, raises);
129 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
133 cp_build_parm_decl (tree name, tree type)
135 tree parm = build_decl (PARM_DECL, name, type);
136 /* DECL_ARG_TYPE is only used by the back end and the back end never
138 if (!processing_template_decl)
139 DECL_ARG_TYPE (parm) = type_passed_as (type);
141 /* If the type is a pack expansion, then we have a function
143 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
144 FUNCTION_PARAMETER_PACK_P (parm) = 1;
149 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
153 build_artificial_parm (tree name, tree type)
155 tree parm = cp_build_parm_decl (name, type);
156 DECL_ARTIFICIAL (parm) = 1;
157 /* All our artificial parms are implicitly `const'; they cannot be
159 TREE_READONLY (parm) = 1;
163 /* Constructors for types with virtual baseclasses need an "in-charge" flag
164 saying whether this constructor is responsible for initialization of
165 virtual baseclasses or not. All destructors also need this "in-charge"
166 flag, which additionally determines whether or not the destructor should
167 free the memory for the object.
169 This function adds the "in-charge" flag to member function FN if
170 appropriate. It is called from grokclassfn and tsubst.
171 FN must be either a constructor or destructor.
173 The in-charge flag follows the 'this' parameter, and is followed by the
174 VTT parm (if any), then the user-written parms. */
177 maybe_retrofit_in_chrg (tree fn)
179 tree basetype, arg_types, parms, parm, fntype;
181 /* If we've already add the in-charge parameter don't do it again. */
182 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
185 /* When processing templates we can't know, in general, whether or
186 not we're going to have virtual baseclasses. */
187 if (processing_template_decl)
190 /* We don't need an in-charge parameter for constructors that don't
191 have virtual bases. */
192 if (DECL_CONSTRUCTOR_P (fn)
193 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
196 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
197 basetype = TREE_TYPE (TREE_VALUE (arg_types));
198 arg_types = TREE_CHAIN (arg_types);
200 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
202 /* If this is a subobject constructor or destructor, our caller will
203 pass us a pointer to our VTT. */
204 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
206 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
208 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
209 TREE_CHAIN (parm) = parms;
212 /* ...and then to TYPE_ARG_TYPES. */
213 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
215 DECL_HAS_VTT_PARM_P (fn) = 1;
218 /* Then add the in-charge parm (before the VTT parm). */
219 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
220 TREE_CHAIN (parm) = parms;
222 arg_types = hash_tree_chain (integer_type_node, arg_types);
224 /* Insert our new parameter(s) into the list. */
225 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
227 /* And rebuild the function type. */
228 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
230 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
231 fntype = build_exception_variant (fntype,
232 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
233 TREE_TYPE (fn) = fntype;
235 /* Now we've got the in-charge parameter. */
236 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
239 /* Classes overload their constituent function names automatically.
240 When a function name is declared in a record structure,
241 its name is changed to it overloaded name. Since names for
242 constructors and destructors can conflict, we place a leading
245 CNAME is the name of the class we are grokking for.
247 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
249 FLAGS contains bits saying what's special about today's
250 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
252 If FUNCTION is a destructor, then we must add the `auto-delete' field
253 as a second parameter. There is some hair associated with the fact
254 that we must "declare" this variable in the manner consistent with the
255 way the rest of the arguments were declared.
257 QUALS are the qualifiers for the this pointer. */
260 grokclassfn (tree ctype, tree function, enum overload_flags flags)
262 tree fn_name = DECL_NAME (function);
264 /* Even within an `extern "C"' block, members get C++ linkage. See
265 [dcl.link] for details. */
266 SET_DECL_LANGUAGE (function, lang_cplusplus);
268 if (fn_name == NULL_TREE)
270 error ("name missing for member function");
271 fn_name = get_identifier ("<anonymous>");
272 DECL_NAME (function) = fn_name;
275 DECL_CONTEXT (function) = ctype;
277 if (flags == DTOR_FLAG)
278 DECL_DESTRUCTOR_P (function) = 1;
280 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
281 maybe_retrofit_in_chrg (function);
284 /* Create an ARRAY_REF, checking for the user doing things backwards
288 grok_array_decl (tree array_expr, tree index_exp)
292 tree orig_array_expr = array_expr;
293 tree orig_index_exp = index_exp;
295 if (error_operand_p (array_expr) || error_operand_p (index_exp))
296 return error_mark_node;
298 if (processing_template_decl)
300 if (type_dependent_expression_p (array_expr)
301 || type_dependent_expression_p (index_exp))
302 return build_min_nt (ARRAY_REF, array_expr, index_exp,
303 NULL_TREE, NULL_TREE);
304 array_expr = build_non_dependent_expr (array_expr);
305 index_exp = build_non_dependent_expr (index_exp);
308 type = TREE_TYPE (array_expr);
310 type = non_reference (type);
312 /* If they have an `operator[]', use that. */
313 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
314 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
315 array_expr, index_exp, NULL_TREE,
316 /*overloaded_p=*/NULL, tf_warning_or_error);
321 /* Otherwise, create an ARRAY_REF for a pointer or array type.
322 It is a little-known fact that, if `a' is an array and `i' is
323 an int, you can write `i[a]', which means the same thing as
325 if (TREE_CODE (type) == ARRAY_TYPE)
328 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
330 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
333 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
335 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
337 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
340 if ((p1 && i2) && (i1 && p2))
341 error ("ambiguous conversion for array subscript");
344 array_expr = p1, index_exp = i2;
346 array_expr = p2, index_exp = i1;
349 error ("invalid types %<%T[%T]%> for array subscript",
350 type, TREE_TYPE (index_exp));
351 return error_mark_node;
354 if (array_expr == error_mark_node || index_exp == error_mark_node)
355 error ("ambiguous conversion for array subscript");
357 expr = build_array_ref (array_expr, index_exp, input_location);
359 if (processing_template_decl && expr != error_mark_node)
360 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
361 NULL_TREE, NULL_TREE);
365 /* Given the cast expression EXP, checking out its validity. Either return
366 an error_mark_node if there was an unavoidable error, return a cast to
367 void for trying to delete a pointer w/ the value 0, or return the
368 call to delete. If DOING_VEC is true, we handle things differently
369 for doing an array delete.
370 Implements ARM $5.3.4. This is called from the parser. */
373 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
377 if (exp == error_mark_node)
380 if (processing_template_decl)
382 t = build_min (DELETE_EXPR, void_type_node, exp, size);
383 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
384 DELETE_EXPR_USE_VEC (t) = doing_vec;
385 TREE_SIDE_EFFECTS (t) = 1;
389 /* An array can't have been allocated by new, so complain. */
390 if (TREE_CODE (exp) == VAR_DECL
391 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
392 warning (0, "deleting array %q#D", exp);
394 t = build_expr_type_conversion (WANT_POINTER, exp, true);
396 if (t == NULL_TREE || t == error_mark_node)
398 error ("type %q#T argument given to %<delete%>, expected pointer",
400 return error_mark_node;
403 type = TREE_TYPE (t);
405 /* As of Valley Forge, you can delete a pointer to const. */
407 /* You can't delete functions. */
408 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
410 error ("cannot delete a function. Only pointer-to-objects are "
411 "valid arguments to %<delete%>");
412 return error_mark_node;
415 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
416 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
418 warning (0, "deleting %qT is undefined", type);
422 /* Deleting a pointer with the value zero is valid and has no effect. */
423 if (integer_zerop (t))
424 return build1 (NOP_EXPR, void_type_node, t);
427 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
428 sfk_deleting_destructor,
431 return build_delete (type, t, sfk_deleting_destructor,
432 LOOKUP_NORMAL, use_global_delete);
435 /* Report an error if the indicated template declaration is not the
436 sort of thing that should be a member template. */
439 check_member_template (tree tmpl)
443 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
444 decl = DECL_TEMPLATE_RESULT (tmpl);
446 if (TREE_CODE (decl) == FUNCTION_DECL
447 || (TREE_CODE (decl) == TYPE_DECL
448 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
450 /* The parser rejects template declarations in local classes. */
451 gcc_assert (!current_function_decl);
452 /* The parser rejects any use of virtual in a function template. */
453 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
454 && DECL_VIRTUAL_P (decl)));
456 /* The debug-information generating code doesn't know what to do
457 with member templates. */
458 DECL_IGNORED_P (tmpl) = 1;
461 error ("template declaration of %q#D", decl);
464 /* Return true iff TYPE is a valid Java parameter or return type. */
467 acceptable_java_type (tree type)
469 if (type == error_mark_node)
472 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
474 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
476 type = TREE_TYPE (type);
477 if (TREE_CODE (type) == RECORD_TYPE)
480 if (! TYPE_FOR_JAVA (type))
482 if (! CLASSTYPE_TEMPLATE_INFO (type))
484 args = CLASSTYPE_TI_ARGS (type);
485 i = TREE_VEC_LENGTH (args);
488 type = TREE_VEC_ELT (args, i);
489 if (TREE_CODE (type) == POINTER_TYPE)
490 type = TREE_TYPE (type);
491 if (! TYPE_FOR_JAVA (type))
500 /* For a METHOD in a Java class CTYPE, return true if
501 the parameter and return types are valid Java types.
502 Otherwise, print appropriate error messages, and return false. */
505 check_java_method (tree method)
508 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
509 tree ret_type = TREE_TYPE (TREE_TYPE (method));
511 if (!acceptable_java_type (ret_type))
513 error ("Java method %qD has non-Java return type %qT",
518 arg_types = TREE_CHAIN (arg_types);
519 if (DECL_HAS_IN_CHARGE_PARM_P (method))
520 arg_types = TREE_CHAIN (arg_types);
521 if (DECL_HAS_VTT_PARM_P (method))
522 arg_types = TREE_CHAIN (arg_types);
524 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
526 tree type = TREE_VALUE (arg_types);
527 if (!acceptable_java_type (type))
529 if (type != error_mark_node)
530 error ("Java method %qD has non-Java parameter type %qT",
538 /* Sanity check: report error if this function FUNCTION is not
539 really a member of the class (CTYPE) it is supposed to belong to.
540 TEMPLATE_PARMS is used to specify the template parameters of a member
541 template passed as FUNCTION_DECL. If the member template is passed as a
542 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
543 from the declaration. If the function is not a function template, it
545 It returns the original declaration for the function, NULL_TREE if
546 no declaration was found, error_mark_node if an error was emitted. */
549 check_classfn (tree ctype, tree function, tree template_parms)
555 if (DECL_USE_TEMPLATE (function)
556 && !(TREE_CODE (function) == TEMPLATE_DECL
557 && DECL_TEMPLATE_SPECIALIZATION (function))
558 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
559 /* Since this is a specialization of a member template,
560 we're not going to find the declaration in the class.
563 struct S { template <typename T> void f(T); };
564 template <> void S::f(int);
566 we're not going to find `S::f(int)', but there's no
567 reason we should, either. We let our callers know we didn't
568 find the method, but we don't complain. */
571 /* Basic sanity check: for a template function, the template parameters
572 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
573 if (TREE_CODE (function) == TEMPLATE_DECL)
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_at (DECL_SOURCE_LOCATION (function),
642 "prototype for %q#D does not match any in class %qT",
644 is_conv_op = DECL_CONV_FN_P (fndecl);
647 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
648 fndecls = VEC_index (tree, methods, ix);
651 fndecl = OVL_CURRENT (fndecls);
652 fndecls = OVL_NEXT (fndecls);
654 if (!fndecls && is_conv_op)
656 if (VEC_length (tree, methods) > (size_t) ++ix)
658 fndecls = VEC_index (tree, methods, ix);
659 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
671 format = N_("candidates are: %+#D");
673 format = N_("candidate is: %+#D");
674 error (format, fndecl);
677 else if (!COMPLETE_TYPE_P (ctype))
678 cxx_incomplete_type_error (function, ctype);
680 error ("no %q#D member function declared in class %qT",
684 pop_scope (pushed_scope);
685 return error_mark_node;
688 /* DECL is a function with vague linkage. Remember it so that at the
689 end of the translation unit we can decide whether or not to emit
693 note_vague_linkage_fn (tree decl)
695 if (!DECL_DEFERRED_FN (decl))
697 DECL_DEFERRED_FN (decl) = 1;
698 DECL_DEFER_OUTPUT (decl) = 1;
699 VEC_safe_push (tree, gc, deferred_fns, decl);
703 /* We have just processed the DECL, which is a static data member.
704 The other parameters are as for cp_finish_decl. */
707 finish_static_data_member_decl (tree decl,
708 tree init, bool init_const_expr_p,
712 DECL_CONTEXT (decl) = current_class_type;
714 /* We cannot call pushdecl here, because that would fill in the
715 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
716 the right thing, namely, to put this decl out straight away. */
718 if (! processing_template_decl)
719 VEC_safe_push (tree, gc, pending_statics, decl);
721 if (LOCAL_CLASS_P (current_class_type))
722 permerror (input_location, "local class %q#T shall not have static data member %q#D",
723 current_class_type, decl);
725 /* Static consts need not be initialized in the class definition. */
726 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
728 static int explained = 0;
730 error ("initializer invalid for static member with constructor");
733 error ("(an out of class initialization is required)");
738 /* Force the compiler to know when an uninitialized static const
739 member is being used. */
740 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
741 TREE_USED (decl) = 1;
742 DECL_INITIAL (decl) = init;
743 DECL_IN_AGGR_P (decl) = 1;
745 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
748 /* DECLARATOR and DECLSPECS correspond to a class member. The other
749 parameters are as for cp_finish_decl. Return the DECL for the
750 class member declared. */
753 grokfield (const cp_declarator *declarator,
754 cp_decl_specifier_seq *declspecs,
755 tree init, bool init_const_expr_p,
760 const char *asmspec = 0;
761 int flags = LOOKUP_ONLYCONVERTING;
764 && TREE_CODE (init) == TREE_LIST
765 && TREE_VALUE (init) == error_mark_node
766 && TREE_CHAIN (init) == NULL_TREE)
769 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
770 if (! value || error_operand_p (value))
771 /* friend or constructor went bad. */
772 return error_mark_node;
774 if (TREE_CODE (value) == TYPE_DECL && init)
776 error ("typedef %qD is initialized (use __typeof__ instead)", value);
780 /* Pass friendly classes back. */
781 if (value == void_type_node)
784 /* Pass friend decls back. */
785 if ((TREE_CODE (value) == FUNCTION_DECL
786 || TREE_CODE (value) == TEMPLATE_DECL)
787 && DECL_CONTEXT (value) != current_class_type)
790 if (DECL_NAME (value) != NULL_TREE
791 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
792 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
793 error ("member %qD conflicts with virtual function table field name",
796 /* Stash away type declarations. */
797 if (TREE_CODE (value) == TYPE_DECL)
799 DECL_NONLOCAL (value) = 1;
800 DECL_CONTEXT (value) = current_class_type;
802 if (processing_template_decl)
803 value = push_template_decl (value);
806 cplus_decl_attributes (&value, attrlist, 0);
811 if (DECL_IN_AGGR_P (value))
813 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
814 return void_type_node;
817 if (asmspec_tree && asmspec_tree != error_mark_node)
818 asmspec = TREE_STRING_POINTER (asmspec_tree);
822 if (TREE_CODE (value) == FUNCTION_DECL)
824 /* Initializers for functions are rejected early in the parser.
825 If we get here, it must be a pure specifier for a method. */
826 if (init == ridpointers[(int)RID_DELETE])
828 DECL_DELETED_FN (value) = 1;
829 DECL_DECLARED_INLINE_P (value) = 1;
830 DECL_INITIAL (value) = error_mark_node;
832 else if (init == ridpointers[(int)RID_DEFAULT])
834 if (!defaultable_fn_p (value))
835 error ("%qD cannot be defaulted", value);
838 DECL_DEFAULTED_FN (value) = 1;
839 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
840 DECL_DECLARED_INLINE_P (value) = 1;
843 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
845 gcc_assert (error_operand_p (init) || integer_zerop (init));
846 DECL_PURE_VIRTUAL_P (value) = 1;
850 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
851 error ("initializer specified for static member function %qD",
855 else if (pedantic && TREE_CODE (value) != VAR_DECL)
856 /* Already complained in grokdeclarator. */
858 else if (!processing_template_decl)
860 if (TREE_CODE (init) == CONSTRUCTOR)
861 init = digest_init (TREE_TYPE (value), init);
863 init = integral_constant_value (init);
865 if (init != error_mark_node && !TREE_CONSTANT (init))
867 /* We can allow references to things that are effectively
868 static, since references are initialized with the
870 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
871 || (TREE_STATIC (init) == 0
872 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
874 error ("field initializer is not constant");
875 init = error_mark_node;
881 if (processing_template_decl
882 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
884 value = push_template_decl (value);
885 if (error_operand_p (value))
886 return error_mark_node;
890 cplus_decl_attributes (&value, attrlist, 0);
892 switch (TREE_CODE (value))
895 finish_static_data_member_decl (value, init, init_const_expr_p,
896 asmspec_tree, flags);
901 error ("%<asm%> specifiers are not permitted on non-static data members");
902 if (DECL_INITIAL (value) == error_mark_node)
903 init = error_mark_node;
904 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
906 DECL_INITIAL (value) = init;
907 DECL_IN_AGGR_P (value) = 1;
912 set_user_assembler_name (value, asmspec);
914 cp_finish_decl (value,
916 /*init_const_expr_p=*/false,
917 asmspec_tree, flags);
919 /* Pass friends back this way. */
920 if (DECL_FRIEND_P (value))
921 return void_type_node;
923 DECL_IN_AGGR_P (value) = 1;
932 /* Like `grokfield', but for bitfields.
933 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
936 grokbitfield (const cp_declarator *declarator,
937 cp_decl_specifier_seq *declspecs, tree width,
940 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
942 if (value == error_mark_node)
943 return NULL_TREE; /* friends went bad. */
945 /* Pass friendly classes back. */
946 if (TREE_CODE (value) == VOID_TYPE)
947 return void_type_node;
949 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
950 && (POINTER_TYPE_P (value)
951 || !dependent_type_p (TREE_TYPE (value))))
953 error ("bit-field %qD with non-integral type", value);
954 return error_mark_node;
957 if (TREE_CODE (value) == TYPE_DECL)
959 error ("cannot declare %qD to be a bit-field type", value);
963 /* Usually, finish_struct_1 catches bitfields with invalid types.
964 But, in the case of bitfields with function type, we confuse
965 ourselves into thinking they are member functions, so we must
967 if (TREE_CODE (value) == FUNCTION_DECL)
969 error ("cannot declare bit-field %qD with function type",
974 if (DECL_IN_AGGR_P (value))
976 error ("%qD is already defined in the class %qT", value,
977 DECL_CONTEXT (value));
978 return void_type_node;
981 if (TREE_STATIC (value))
983 error ("static member %qD cannot be a bit-field", value);
986 finish_decl (value, NULL_TREE, NULL_TREE);
988 if (width != error_mark_node)
990 constant_expression_warning (width);
991 DECL_INITIAL (value) = width;
992 SET_DECL_C_BIT_FIELD (value);
995 DECL_IN_AGGR_P (value) = 1;
998 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1004 /* Returns true iff ATTR is an attribute which needs to be applied at
1005 instantiation time rather than template definition time. */
1008 is_late_template_attribute (tree attr, tree decl)
1010 tree name = TREE_PURPOSE (attr);
1011 tree args = TREE_VALUE (attr);
1012 const struct attribute_spec *spec = lookup_attribute_spec (name);
1016 /* Unknown attribute. */
1019 /* Attribute weak handling wants to write out assembly right away. */
1020 if (is_attribute_p ("weak", name))
1023 /* If any of the arguments are dependent expressions, we can't evaluate
1024 the attribute until instantiation time. */
1025 for (arg = args; arg; arg = TREE_CHAIN (arg))
1027 tree t = TREE_VALUE (arg);
1029 /* If the first attribute argument is an identifier, only consider
1030 second and following arguments. Attributes like mode, format,
1031 cleanup and several target specific attributes aren't late
1032 just because they have an IDENTIFIER_NODE as first argument. */
1033 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1036 if (value_dependent_expression_p (t)
1037 || type_dependent_expression_p (t))
1041 if (TREE_CODE (decl) == TYPE_DECL
1043 || spec->type_required)
1045 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1047 /* We can't apply any attributes to a completely unknown type until
1048 instantiation time. */
1049 enum tree_code code = TREE_CODE (type);
1050 if (code == TEMPLATE_TYPE_PARM
1051 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1052 || code == TYPENAME_TYPE)
1054 /* Also defer most attributes on dependent types. This is not
1055 necessary in all cases, but is the better default. */
1056 else if (dependent_type_p (type)
1057 /* But attribute visibility specifically works on
1059 && !is_attribute_p ("visibility", name))
1068 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1069 applied at instantiation time and return them. If IS_DEPENDENT is true,
1070 the declaration itself is dependent, so all attributes should be applied
1071 at instantiation time. */
1074 splice_template_attributes (tree *attr_p, tree decl)
1077 tree late_attrs = NULL_TREE;
1078 tree *q = &late_attrs;
1085 if (is_late_template_attribute (*p, decl))
1087 ATTR_IS_DEPENDENT (*p) = 1;
1089 *p = TREE_CHAIN (*p);
1090 q = &TREE_CHAIN (*q);
1094 p = &TREE_CHAIN (*p);
1100 /* Remove any late attributes from the list in ATTR_P and attach them to
1104 save_template_attributes (tree *attr_p, tree *decl_p)
1106 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1108 tree old_attrs = NULL_TREE;
1113 /* Give this type a name so we know to look it up again at instantiation
1115 if (TREE_CODE (*decl_p) == TYPE_DECL
1116 && DECL_ORIGINAL_TYPE (*decl_p) == NULL_TREE)
1118 tree oldt = TREE_TYPE (*decl_p);
1119 tree newt = build_variant_type_copy (oldt);
1120 DECL_ORIGINAL_TYPE (*decl_p) = oldt;
1121 TREE_TYPE (*decl_p) = newt;
1122 TYPE_NAME (newt) = *decl_p;
1123 TREE_USED (newt) = TREE_USED (*decl_p);
1126 if (DECL_P (*decl_p))
1127 q = &DECL_ATTRIBUTES (*decl_p);
1129 q = &TYPE_ATTRIBUTES (*decl_p);
1133 /* Place the late attributes at the beginning of the attribute
1135 TREE_CHAIN (tree_last (late_attrs)) = *q;
1138 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1140 /* We've added new attributes directly to the main variant, so
1141 now we need to update all of the other variants to include
1142 these new attributes. */
1144 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1145 variant = TYPE_NEXT_VARIANT (variant))
1147 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1148 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1153 /* Like reconstruct_complex_type, but handle also template trees. */
1156 cp_reconstruct_complex_type (tree type, tree bottom)
1160 if (TREE_CODE (type) == POINTER_TYPE)
1162 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1163 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1164 TYPE_REF_CAN_ALIAS_ALL (type));
1166 else if (TREE_CODE (type) == REFERENCE_TYPE)
1168 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1169 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1170 TYPE_REF_CAN_ALIAS_ALL (type));
1172 else if (TREE_CODE (type) == ARRAY_TYPE)
1174 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1175 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1176 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1177 element type qualification will be handled by the recursive
1178 cp_reconstruct_complex_type call and cp_build_qualified_type
1179 for ARRAY_TYPEs changes the element type. */
1182 else if (TREE_CODE (type) == FUNCTION_TYPE)
1184 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1185 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1187 else if (TREE_CODE (type) == METHOD_TYPE)
1189 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1190 /* The build_method_type_directly() routine prepends 'this' to argument list,
1191 so we must compensate by getting rid of it. */
1193 = build_method_type_directly
1194 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1196 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1198 else if (TREE_CODE (type) == OFFSET_TYPE)
1200 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1201 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1206 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1209 /* Like decl_attributes, but handle C++ complexity. */
1212 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1214 if (*decl == NULL_TREE || *decl == void_type_node
1215 || *decl == error_mark_node
1216 || attributes == NULL_TREE)
1219 if (processing_template_decl)
1221 if (check_for_bare_parameter_packs (attributes))
1224 save_template_attributes (&attributes, decl);
1225 if (attributes == NULL_TREE)
1229 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1230 decl = &DECL_TEMPLATE_RESULT (*decl);
1232 decl_attributes (decl, attributes, flags);
1234 if (TREE_CODE (*decl) == TYPE_DECL)
1235 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1238 /* Walks through the namespace- or function-scope anonymous union
1239 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1240 Returns one of the fields for use in the mangled name. */
1243 build_anon_union_vars (tree type, tree object)
1245 tree main_decl = NULL_TREE;
1248 /* Rather than write the code to handle the non-union case,
1249 just give an error. */
1250 if (TREE_CODE (type) != UNION_TYPE)
1251 error ("anonymous struct not inside named type");
1253 for (field = TYPE_FIELDS (type);
1255 field = TREE_CHAIN (field))
1260 if (DECL_ARTIFICIAL (field))
1262 if (TREE_CODE (field) != FIELD_DECL)
1264 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1265 "have non-static data members", field);
1269 if (TREE_PRIVATE (field))
1270 permerror (input_location, "private member %q+#D in anonymous union", field);
1271 else if (TREE_PROTECTED (field))
1272 permerror (input_location, "protected member %q+#D in anonymous union", field);
1274 if (processing_template_decl)
1275 ref = build_min_nt (COMPONENT_REF, object,
1276 DECL_NAME (field), NULL_TREE);
1278 ref = build_class_member_access_expr (object, field, NULL_TREE,
1279 false, tf_warning_or_error);
1281 if (DECL_NAME (field))
1285 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1286 DECL_ANON_UNION_VAR_P (decl) = 1;
1288 base = get_base_address (object);
1289 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1290 TREE_STATIC (decl) = TREE_STATIC (base);
1291 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1293 SET_DECL_VALUE_EXPR (decl, ref);
1294 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1296 decl = pushdecl (decl);
1298 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1299 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1303 if (main_decl == NULL_TREE)
1310 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1311 anonymous union, then all members must be laid out together. PUBLIC_P
1312 is nonzero if this union is not declared static. */
1315 finish_anon_union (tree anon_union_decl)
1321 if (anon_union_decl == error_mark_node)
1324 type = TREE_TYPE (anon_union_decl);
1325 public_p = TREE_PUBLIC (anon_union_decl);
1327 /* The VAR_DECL's context is the same as the TYPE's context. */
1328 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1330 if (TYPE_FIELDS (type) == NULL_TREE)
1335 error ("namespace-scope anonymous aggregates must be static");
1339 main_decl = build_anon_union_vars (type, anon_union_decl);
1340 if (main_decl == error_mark_node)
1342 if (main_decl == NULL_TREE)
1344 warning (0, "anonymous union with no members");
1348 if (!processing_template_decl)
1350 /* Use main_decl to set the mangled name. */
1351 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1352 mangle_decl (anon_union_decl);
1353 DECL_NAME (anon_union_decl) = NULL_TREE;
1356 pushdecl (anon_union_decl);
1357 if (building_stmt_tree ()
1358 && at_function_scope_p ())
1359 add_decl_expr (anon_union_decl);
1360 else if (!processing_template_decl)
1361 rest_of_decl_compilation (anon_union_decl,
1362 toplevel_bindings_p (), at_eof);
1365 /* Auxiliary functions to make type signatures for
1366 `operator new' and `operator delete' correspond to
1367 what compiler will be expecting. */
1370 coerce_new_type (tree type)
1373 tree args = TYPE_ARG_TYPES (type);
1375 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1377 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1380 error ("%<operator new%> must return type %qT", ptr_type_node);
1383 if (args && args != void_list_node)
1385 if (TREE_PURPOSE (args))
1387 /* [basic.stc.dynamic.allocation]
1389 The first parameter shall not have an associated default
1391 error ("the first parameter of %<operator new%> cannot "
1392 "have a default argument");
1393 /* Throw away the default argument. */
1394 TREE_PURPOSE (args) = NULL_TREE;
1397 if (!same_type_p (TREE_VALUE (args), size_type_node))
1400 args = TREE_CHAIN (args);
1407 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1408 "as first parameter", size_type_node);
1413 args = tree_cons (NULL_TREE, size_type_node, args);
1416 type = build_exception_variant
1417 (build_function_type (ptr_type_node, args),
1418 TYPE_RAISES_EXCEPTIONS (type));
1426 coerce_delete_type (tree type)
1429 tree args = TYPE_ARG_TYPES (type);
1431 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1433 if (!same_type_p (TREE_TYPE (type), void_type_node))
1436 error ("%<operator delete%> must return type %qT", void_type_node);
1439 if (!args || args == void_list_node
1440 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1443 if (args && args != void_list_node)
1444 args = TREE_CHAIN (args);
1445 error ("%<operator delete%> takes type %qT as first parameter",
1451 args = tree_cons (NULL_TREE, ptr_type_node, args);
1454 type = build_exception_variant
1455 (build_function_type (void_type_node, args),
1456 TYPE_RAISES_EXCEPTIONS (type));
1464 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1465 and mark them as needed. */
1468 mark_vtable_entries (tree decl)
1471 unsigned HOST_WIDE_INT idx;
1473 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1478 STRIP_NOPS (fnaddr);
1480 if (TREE_CODE (fnaddr) != ADDR_EXPR
1481 && TREE_CODE (fnaddr) != FDESC_EXPR)
1482 /* This entry is an offset: a virtual base class offset, a
1483 virtual call offset, an RTTI offset, etc. */
1486 fn = TREE_OPERAND (fnaddr, 0);
1487 TREE_ADDRESSABLE (fn) = 1;
1488 /* When we don't have vcall offsets, we output thunks whenever
1489 we output the vtables that contain them. With vcall offsets,
1490 we know all the thunks we'll need when we emit a virtual
1491 function, so we emit the thunks there instead. */
1492 if (DECL_THUNK_P (fn))
1493 use_thunk (fn, /*emit_p=*/0);
1498 /* Set DECL up to have the closest approximation of "initialized common"
1499 linkage available. */
1502 comdat_linkage (tree decl)
1505 make_decl_one_only (decl);
1506 else if (TREE_CODE (decl) == FUNCTION_DECL
1507 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1508 /* We can just emit function and compiler-generated variables
1509 statically; having multiple copies is (for the most part) only
1512 There are two correctness issues, however: the address of a
1513 template instantiation with external linkage should be the
1514 same, independent of what translation unit asks for the
1515 address, and this will not hold when we emit multiple copies of
1516 the function. However, there's little else we can do.
1518 Also, by default, the typeinfo implementation assumes that
1519 there will be only one copy of the string used as the name for
1520 each type. Therefore, if weak symbols are unavailable, the
1521 run-time library should perform a more conservative check; it
1522 should perform a string comparison, rather than an address
1524 TREE_PUBLIC (decl) = 0;
1527 /* Static data member template instantiations, however, cannot
1528 have multiple copies. */
1529 if (DECL_INITIAL (decl) == 0
1530 || DECL_INITIAL (decl) == error_mark_node)
1531 DECL_COMMON (decl) = 1;
1532 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1534 DECL_COMMON (decl) = 1;
1535 DECL_INITIAL (decl) = error_mark_node;
1537 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1539 /* We can't do anything useful; leave vars for explicit
1541 DECL_EXTERNAL (decl) = 1;
1542 DECL_NOT_REALLY_EXTERN (decl) = 0;
1546 if (DECL_LANG_SPECIFIC (decl))
1547 DECL_COMDAT (decl) = 1;
1550 /* For win32 we also want to put explicit instantiations in
1551 linkonce sections, so that they will be merged with implicit
1552 instantiations; otherwise we get duplicate symbol errors.
1553 For Darwin we do not want explicit instantiations to be
1557 maybe_make_one_only (tree decl)
1559 /* We used to say that this was not necessary on targets that support weak
1560 symbols, because the implicit instantiations will defer to the explicit
1561 one. However, that's not actually the case in SVR4; a strong definition
1562 after a weak one is an error. Also, not making explicit
1563 instantiations one_only means that we can end up with two copies of
1564 some template instantiations. */
1568 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1569 we can get away with not emitting them if they aren't used. We need
1570 to for variables so that cp_finish_decl will update their linkage,
1571 because their DECL_INITIAL may not have been set properly yet. */
1573 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1574 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1575 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1577 make_decl_one_only (decl);
1579 if (TREE_CODE (decl) == VAR_DECL)
1581 DECL_COMDAT (decl) = 1;
1582 /* Mark it needed so we don't forget to emit it. */
1583 mark_decl_referenced (decl);
1588 /* Determine whether or not we want to specifically import or export CTYPE,
1589 using various heuristics. */
1592 import_export_class (tree ctype)
1594 /* -1 for imported, 1 for exported. */
1595 int import_export = 0;
1597 /* It only makes sense to call this function at EOF. The reason is
1598 that this function looks at whether or not the first non-inline
1599 non-abstract virtual member function has been defined in this
1600 translation unit. But, we can't possibly know that until we've
1601 seen the entire translation unit. */
1602 gcc_assert (at_eof);
1604 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1607 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1608 we will have CLASSTYPE_INTERFACE_ONLY set but not
1609 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1610 heuristic because someone will supply a #pragma implementation
1611 elsewhere, and deducing it here would produce a conflict. */
1612 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1615 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1617 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1619 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1620 && !flag_implicit_templates)
1621 /* For a template class, without -fimplicit-templates, check the
1622 repository. If the virtual table is assigned to this
1623 translation unit, then export the class; otherwise, import
1625 import_export = repo_export_class_p (ctype) ? 1 : -1;
1626 else if (TYPE_POLYMORPHIC_P (ctype))
1628 /* The ABI specifies that the virtual table and associated
1629 information are emitted with the key method, if any. */
1630 tree method = CLASSTYPE_KEY_METHOD (ctype);
1631 /* If weak symbol support is not available, then we must be
1632 careful not to emit the vtable when the key function is
1633 inline. An inline function can be defined in multiple
1634 translation units. If we were to emit the vtable in each
1635 translation unit containing a definition, we would get
1636 multiple definition errors at link-time. */
1637 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1638 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1641 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1642 a definition anywhere else. */
1643 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1646 /* Allow back ends the chance to overrule the decision. */
1647 if (targetm.cxx.import_export_class)
1648 import_export = targetm.cxx.import_export_class (ctype, import_export);
1652 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1653 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1657 /* Return true if VAR has already been provided to the back end; in that
1658 case VAR should not be modified further by the front end. */
1660 var_finalized_p (tree var)
1662 return varpool_node (var)->finalized;
1665 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1666 must be emitted in this translation unit. Mark it as such. */
1669 mark_needed (tree decl)
1671 /* It's possible that we no longer need to set
1672 TREE_SYMBOL_REFERENCED here directly, but doing so is
1674 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1675 mark_decl_referenced (decl);
1678 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1679 returns true if a definition of this entity should be provided in
1680 this object file. Callers use this function to determine whether
1681 or not to let the back end know that a definition of DECL is
1682 available in this translation unit. */
1685 decl_needed_p (tree decl)
1687 gcc_assert (TREE_CODE (decl) == VAR_DECL
1688 || TREE_CODE (decl) == FUNCTION_DECL);
1689 /* This function should only be called at the end of the translation
1690 unit. We cannot be sure of whether or not something will be
1691 COMDAT until that point. */
1692 gcc_assert (at_eof);
1694 /* All entities with external linkage that are not COMDAT should be
1695 emitted; they may be referred to from other object files. */
1696 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1698 /* If this entity was used, let the back end see it; it will decide
1699 whether or not to emit it into the object file. */
1700 if (TREE_USED (decl)
1701 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1702 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1704 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1705 reference to DECL might cause it to be emitted later. */
1709 /* If necessary, write out the vtables for the dynamic class CTYPE.
1710 Returns true if any vtables were emitted. */
1713 maybe_emit_vtables (tree ctype)
1719 /* If the vtables for this class have already been emitted there is
1720 nothing more to do. */
1721 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1722 if (var_finalized_p (primary_vtbl))
1724 /* Ignore dummy vtables made by get_vtable_decl. */
1725 if (TREE_TYPE (primary_vtbl) == void_type_node)
1728 /* On some targets, we cannot determine the key method until the end
1729 of the translation unit -- which is when this function is
1731 if (!targetm.cxx.key_method_may_be_inline ())
1732 determine_key_method (ctype);
1734 /* See if any of the vtables are needed. */
1735 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1737 import_export_decl (vtbl);
1738 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1743 /* If the references to this class' vtables are optimized away,
1744 still emit the appropriate debugging information. See
1746 if (DECL_COMDAT (primary_vtbl)
1747 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1748 note_debug_info_needed (ctype);
1752 /* The ABI requires that we emit all of the vtables if we emit any
1754 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1756 /* Mark entities references from the virtual table as used. */
1757 mark_vtable_entries (vtbl);
1759 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1761 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1763 /* It had better be all done at compile-time. */
1768 DECL_EXTERNAL (vtbl) = 0;
1769 rest_of_decl_compilation (vtbl, 1, 1);
1771 /* Because we're only doing syntax-checking, we'll never end up
1772 actually marking the variable as written. */
1773 if (flag_syntax_only)
1774 TREE_ASM_WRITTEN (vtbl) = 1;
1777 /* Since we're writing out the vtable here, also write the debug
1779 note_debug_info_needed (ctype);
1784 /* A special return value from type_visibility meaning internal
1787 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1789 /* walk_tree helper function for type_visibility. */
1792 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1794 int *vis_p = (int *)data;
1799 else if (CLASS_TYPE_P (*tp))
1801 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1803 *vis_p = VISIBILITY_ANON;
1806 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1807 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1812 /* Returns the visibility of TYPE, which is the minimum visibility of its
1816 type_visibility (tree type)
1818 int vis = VISIBILITY_DEFAULT;
1819 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1823 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1824 specified (or if VISIBILITY is static). */
1827 constrain_visibility (tree decl, int visibility)
1829 if (visibility == VISIBILITY_ANON)
1831 /* extern "C" declarations aren't affected by the anonymous
1833 if (!DECL_EXTERN_C_P (decl))
1835 TREE_PUBLIC (decl) = 0;
1836 DECL_ONE_ONLY (decl) = 0;
1837 DECL_INTERFACE_KNOWN (decl) = 1;
1838 if (DECL_LANG_SPECIFIC (decl))
1839 DECL_NOT_REALLY_EXTERN (decl) = 1;
1842 else if (visibility > DECL_VISIBILITY (decl)
1843 && !DECL_VISIBILITY_SPECIFIED (decl))
1845 DECL_VISIBILITY (decl) = visibility;
1851 /* Constrain the visibility of DECL based on the visibility of its template
1855 constrain_visibility_for_template (tree decl, tree targs)
1857 /* If this is a template instantiation, check the innermost
1858 template args for visibility constraints. The outer template
1859 args are covered by the class check. */
1860 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1862 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1866 tree arg = TREE_VEC_ELT (args, i-1);
1868 vis = type_visibility (arg);
1869 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1872 if (TREE_CODE (arg) == ADDR_EXPR)
1873 arg = TREE_OPERAND (arg, 0);
1874 if (TREE_CODE (arg) == VAR_DECL
1875 || TREE_CODE (arg) == FUNCTION_DECL)
1877 if (! TREE_PUBLIC (arg))
1878 vis = VISIBILITY_ANON;
1880 vis = DECL_VISIBILITY (arg);
1884 constrain_visibility (decl, vis);
1888 /* Like c_determine_visibility, but with additional C++-specific
1891 Function-scope entities can rely on the function's visibility because
1892 it is set in start_preparsed_function.
1894 Class-scope entities cannot rely on the class's visibility until the end
1895 of the enclosing class definition.
1897 Note that because namespaces have multiple independent definitions,
1898 namespace visibility is handled elsewhere using the #pragma visibility
1899 machinery rather than by decorating the namespace declaration.
1901 The goal is for constraints from the type to give a diagnostic, and
1902 other constraints to be applied silently. */
1905 determine_visibility (tree decl)
1907 tree class_type = NULL_TREE;
1910 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1912 /* Only relevant for names with external linkage. */
1913 if (!TREE_PUBLIC (decl))
1916 /* Cloned constructors and destructors get the same visibility as
1917 the underlying function. That should be set up in
1918 maybe_clone_body. */
1919 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1921 if (TREE_CODE (decl) == TYPE_DECL)
1923 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1924 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1925 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1930 else if (DECL_LANG_SPECIFIC (decl))
1931 use_template = DECL_USE_TEMPLATE (decl);
1935 /* If DECL is a member of a class, visibility specifiers on the
1936 class can influence the visibility of the DECL. */
1937 if (DECL_CLASS_SCOPE_P (decl))
1938 class_type = DECL_CONTEXT (decl);
1941 /* Not a class member. */
1943 /* Virtual tables have DECL_CONTEXT set to their associated class,
1944 so they are automatically handled above. */
1945 gcc_assert (TREE_CODE (decl) != VAR_DECL
1946 || !DECL_VTABLE_OR_VTT_P (decl));
1948 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1950 /* Local statics and classes get the visibility of their
1951 containing function by default, except that
1952 -fvisibility-inlines-hidden doesn't affect them. */
1953 tree fn = DECL_CONTEXT (decl);
1954 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1956 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1957 DECL_VISIBILITY_SPECIFIED (decl) =
1958 DECL_VISIBILITY_SPECIFIED (fn);
1961 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1963 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1964 but have no TEMPLATE_INFO, so don't try to check it. */
1967 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1968 && flag_visibility_ms_compat)
1970 /* Under -fvisibility-ms-compat, types are visible by default,
1971 even though their contents aren't. */
1972 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1973 int underlying_vis = type_visibility (underlying_type);
1974 if (underlying_vis == VISIBILITY_ANON
1975 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1976 constrain_visibility (decl, underlying_vis);
1978 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1980 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1982 /* tinfo visibility is based on the type it's for. */
1983 constrain_visibility
1984 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1986 /* Give the target a chance to override the visibility associated
1988 if (TREE_PUBLIC (decl)
1989 && !DECL_REALLY_EXTERN (decl)
1990 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
1991 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
1992 targetm.cxx.determine_class_data_visibility (decl);
1994 else if (use_template)
1995 /* Template instantiations and specializations get visibility based
1996 on their template unless they override it with an attribute. */;
1997 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1999 /* Set default visibility to whatever the user supplied with
2000 #pragma GCC visibility or a namespace visibility attribute. */
2001 DECL_VISIBILITY (decl) = default_visibility;
2002 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2008 /* If the specialization doesn't specify visibility, use the
2009 visibility from the template. */
2010 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2011 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2012 : DECL_TEMPLATE_INFO (decl));
2013 tree args = TI_ARGS (tinfo);
2015 if (args != error_mark_node)
2017 int depth = TMPL_ARGS_DEPTH (args);
2018 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2020 if (!DECL_VISIBILITY_SPECIFIED (decl))
2022 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2023 DECL_VISIBILITY_SPECIFIED (decl)
2024 = DECL_VISIBILITY_SPECIFIED (pattern);
2027 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2028 if (args && depth > template_class_depth (class_type))
2029 /* Limit visibility based on its template arguments. */
2030 constrain_visibility_for_template (decl, args);
2035 determine_visibility_from_class (decl, class_type);
2037 if (decl_anon_ns_mem_p (decl))
2038 /* Names in an anonymous namespace get internal linkage.
2039 This might change once we implement export. */
2040 constrain_visibility (decl, VISIBILITY_ANON);
2041 else if (TREE_CODE (decl) != TYPE_DECL)
2043 /* Propagate anonymity from type to decl. */
2044 int tvis = type_visibility (TREE_TYPE (decl));
2045 if (tvis == VISIBILITY_ANON
2046 || ! DECL_VISIBILITY_SPECIFIED (decl))
2047 constrain_visibility (decl, tvis);
2051 /* By default, static data members and function members receive
2052 the visibility of their containing class. */
2055 determine_visibility_from_class (tree decl, tree class_type)
2057 if (DECL_VISIBILITY_SPECIFIED (decl))
2060 if (visibility_options.inlines_hidden
2061 /* Don't do this for inline templates; specializations might not be
2062 inline, and we don't want them to inherit the hidden
2063 visibility. We'll set it here for all inline instantiations. */
2064 && !processing_template_decl
2065 && TREE_CODE (decl) == FUNCTION_DECL
2066 && DECL_DECLARED_INLINE_P (decl)
2067 && (! DECL_LANG_SPECIFIC (decl)
2068 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2069 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2072 /* Default to the class visibility. */
2073 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2074 DECL_VISIBILITY_SPECIFIED (decl)
2075 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2078 /* Give the target a chance to override the visibility associated
2080 if (TREE_CODE (decl) == VAR_DECL
2081 && (DECL_TINFO_P (decl)
2082 || (DECL_VTABLE_OR_VTT_P (decl)
2083 /* Construction virtual tables are not exported because
2084 they cannot be referred to from other object files;
2085 their name is not standardized by the ABI. */
2086 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2087 && TREE_PUBLIC (decl)
2088 && !DECL_REALLY_EXTERN (decl)
2089 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2090 targetm.cxx.determine_class_data_visibility (decl);
2093 /* Constrain the visibility of a class TYPE based on the visibility of its
2094 field types. Warn if any fields require lesser visibility. */
2097 constrain_class_visibility (tree type)
2103 int vis = type_visibility (type);
2105 if (vis == VISIBILITY_ANON
2106 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2109 /* Don't warn about visibility if the class has explicit visibility. */
2110 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2111 vis = VISIBILITY_INTERNAL;
2113 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2114 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2116 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2117 int subvis = type_visibility (ftype);
2119 if (subvis == VISIBILITY_ANON)
2121 if (!in_main_input_context ())
2123 %qT has a field %qD whose type uses the anonymous namespace",
2126 else if (MAYBE_CLASS_TYPE_P (ftype)
2127 && vis < VISIBILITY_HIDDEN
2128 && subvis >= VISIBILITY_HIDDEN)
2129 warning (OPT_Wattributes, "\
2130 %qT declared with greater visibility than the type of its field %qD",
2134 binfo = TYPE_BINFO (type);
2135 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2137 int subvis = type_visibility (TREE_TYPE (t));
2139 if (subvis == VISIBILITY_ANON)
2141 if (!in_main_input_context())
2143 %qT has a base %qT whose type uses the anonymous namespace",
2144 type, TREE_TYPE (t));
2146 else if (vis < VISIBILITY_HIDDEN
2147 && subvis >= VISIBILITY_HIDDEN)
2148 warning (OPT_Wattributes, "\
2149 %qT declared with greater visibility than its base %qT",
2150 type, TREE_TYPE (t));
2154 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2155 for DECL has not already been determined, do so now by setting
2156 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2157 function is called entities with vague linkage whose definitions
2158 are available must have TREE_PUBLIC set.
2160 If this function decides to place DECL in COMDAT, it will set
2161 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2162 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2163 callers defer that decision until it is clear that DECL is actually
2167 import_export_decl (tree decl)
2172 tree class_type = NULL_TREE;
2174 if (DECL_INTERFACE_KNOWN (decl))
2177 /* We cannot determine what linkage to give to an entity with vague
2178 linkage until the end of the file. For example, a virtual table
2179 for a class will be defined if and only if the key method is
2180 defined in this translation unit. As a further example, consider
2181 that when compiling a translation unit that uses PCH file with
2182 "-frepo" it would be incorrect to make decisions about what
2183 entities to emit when building the PCH; those decisions must be
2184 delayed until the repository information has been processed. */
2185 gcc_assert (at_eof);
2186 /* Object file linkage for explicit instantiations is handled in
2187 mark_decl_instantiated. For static variables in functions with
2188 vague linkage, maybe_commonize_var is used.
2190 Therefore, the only declarations that should be provided to this
2191 function are those with external linkage that are:
2193 * implicit instantiations of function templates
2197 * implicit instantiations of static data members of class
2204 Furthermore, all entities that reach this point must have a
2205 definition available in this translation unit.
2207 The following assertions check these conditions. */
2208 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2209 || TREE_CODE (decl) == VAR_DECL);
2210 /* Any code that creates entities with TREE_PUBLIC cleared should
2211 also set DECL_INTERFACE_KNOWN. */
2212 gcc_assert (TREE_PUBLIC (decl));
2213 if (TREE_CODE (decl) == FUNCTION_DECL)
2214 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2215 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2216 || DECL_DECLARED_INLINE_P (decl));
2218 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2219 || DECL_VTABLE_OR_VTT_P (decl)
2220 || DECL_TINFO_P (decl));
2221 /* Check that a definition of DECL is available in this translation
2223 gcc_assert (!DECL_REALLY_EXTERN (decl));
2225 /* Assume that DECL will not have COMDAT linkage. */
2227 /* Assume that DECL will not be imported into this translation
2231 /* See if the repository tells us whether or not to emit DECL in
2232 this translation unit. */
2233 emit_p = repo_emit_p (decl);
2236 else if (emit_p == 1)
2238 /* The repository indicates that this entity should be defined
2239 here. Make sure the back end honors that request. */
2240 if (TREE_CODE (decl) == VAR_DECL)
2242 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2243 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2246 FOR_EACH_CLONE (clone, decl)
2247 mark_needed (clone);
2251 /* Output the definition as an ordinary strong definition. */
2252 DECL_EXTERNAL (decl) = 0;
2253 DECL_INTERFACE_KNOWN (decl) = 1;
2258 /* We have already decided what to do with this DECL; there is no
2259 need to check anything further. */
2261 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2263 class_type = DECL_CONTEXT (decl);
2264 import_export_class (class_type);
2265 if (TYPE_FOR_JAVA (class_type))
2267 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2268 && CLASSTYPE_INTERFACE_ONLY (class_type))
2270 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2271 && !CLASSTYPE_USE_TEMPLATE (class_type)
2272 && CLASSTYPE_KEY_METHOD (class_type)
2273 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2274 /* The ABI requires that all virtual tables be emitted with
2275 COMDAT linkage. However, on systems where COMDAT symbols
2276 don't show up in the table of contents for a static
2277 archive, or on systems without weak symbols (where we
2278 approximate COMDAT linkage by using internal linkage), the
2279 linker will report errors about undefined symbols because
2280 it will not see the virtual table definition. Therefore,
2281 in the case that we know that the virtual table will be
2282 emitted in only one translation unit, we make the virtual
2283 table an ordinary definition with external linkage. */
2284 DECL_EXTERNAL (decl) = 0;
2285 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2287 /* CLASS_TYPE is being exported from this translation unit,
2288 so DECL should be defined here. */
2289 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2290 /* If a class is declared in a header with the "extern
2291 template" extension, then it will not be instantiated,
2292 even in translation units that would normally require
2293 it. Often such classes are explicitly instantiated in
2294 one translation unit. Therefore, the explicit
2295 instantiation must be made visible to other translation
2297 DECL_EXTERNAL (decl) = 0;
2300 /* The generic C++ ABI says that class data is always
2301 COMDAT, even if there is a key function. Some
2302 variants (e.g., the ARM EABI) says that class data
2303 only has COMDAT linkage if the class data might be
2304 emitted in more than one translation unit. When the
2305 key method can be inline and is inline, we still have
2306 to arrange for comdat even though
2307 class_data_always_comdat is false. */
2308 if (!CLASSTYPE_KEY_METHOD (class_type)
2309 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2310 || targetm.cxx.class_data_always_comdat ())
2312 /* The ABI requires COMDAT linkage. Normally, we
2313 only emit COMDAT things when they are needed;
2314 make sure that we realize that this entity is
2321 else if (!flag_implicit_templates
2322 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2327 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2329 tree type = TREE_TYPE (DECL_NAME (decl));
2330 if (CLASS_TYPE_P (type))
2333 import_export_class (type);
2334 if (CLASSTYPE_INTERFACE_KNOWN (type)
2335 && TYPE_POLYMORPHIC_P (type)
2336 && CLASSTYPE_INTERFACE_ONLY (type)
2337 /* If -fno-rtti was specified, then we cannot be sure
2338 that RTTI information will be emitted with the
2339 virtual table of the class, so we must emit it
2340 wherever it is used. */
2345 if (CLASSTYPE_INTERFACE_KNOWN (type)
2346 && !CLASSTYPE_INTERFACE_ONLY (type))
2348 comdat_p = (targetm.cxx.class_data_always_comdat ()
2349 || (CLASSTYPE_KEY_METHOD (type)
2350 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2355 DECL_EXTERNAL (decl) = 0;
2365 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2366 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2368 /* DECL is an implicit instantiation of a function or static
2370 if ((flag_implicit_templates
2371 && !flag_use_repository)
2372 || (flag_implicit_inline_templates
2373 && TREE_CODE (decl) == FUNCTION_DECL
2374 && DECL_DECLARED_INLINE_P (decl)))
2377 /* If we are not implicitly generating templates, then mark
2378 this entity as undefined in this translation unit. */
2381 else if (DECL_FUNCTION_MEMBER_P (decl))
2383 if (!DECL_DECLARED_INLINE_P (decl))
2385 tree ctype = DECL_CONTEXT (decl);
2386 import_export_class (ctype);
2387 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2389 DECL_NOT_REALLY_EXTERN (decl)
2390 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2391 || (DECL_DECLARED_INLINE_P (decl)
2392 && ! flag_implement_inlines
2393 && !DECL_VINDEX (decl)));
2395 if (!DECL_NOT_REALLY_EXTERN (decl))
2396 DECL_EXTERNAL (decl) = 1;
2398 /* Always make artificials weak. */
2399 if (DECL_ARTIFICIAL (decl) && flag_weak)
2402 maybe_make_one_only (decl);
2413 /* If we are importing DECL into this translation unit, mark is
2414 an undefined here. */
2415 DECL_EXTERNAL (decl) = 1;
2416 DECL_NOT_REALLY_EXTERN (decl) = 0;
2420 /* If we decided to put DECL in COMDAT, mark it accordingly at
2422 comdat_linkage (decl);
2425 DECL_INTERFACE_KNOWN (decl) = 1;
2428 /* Return an expression that performs the destruction of DECL, which
2429 must be a VAR_DECL whose type has a non-trivial destructor, or is
2430 an array whose (innermost) elements have a non-trivial destructor. */
2433 build_cleanup (tree decl)
2436 tree type = TREE_TYPE (decl);
2438 /* This function should only be called for declarations that really
2439 require cleanups. */
2440 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2442 /* Treat all objects with destructors as used; the destructor may do
2443 something substantive. */
2446 if (TREE_CODE (type) == ARRAY_TYPE)
2449 temp = build_address (decl);
2450 temp = build_delete (TREE_TYPE (temp), temp,
2451 sfk_complete_destructor,
2452 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2456 /* Returns the initialization guard variable for the variable DECL,
2457 which has static storage duration. */
2460 get_guard (tree decl)
2465 sname = mangle_guard_variable (decl);
2466 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2471 /* We use a type that is big enough to contain a mutex as well
2472 as an integer counter. */
2473 guard_type = targetm.cxx.guard_type ();
2474 guard = build_decl (VAR_DECL, sname, guard_type);
2476 /* The guard should have the same linkage as what it guards. */
2477 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2478 TREE_STATIC (guard) = TREE_STATIC (decl);
2479 DECL_COMMON (guard) = DECL_COMMON (decl);
2480 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2481 if (TREE_PUBLIC (decl))
2482 DECL_WEAK (guard) = DECL_WEAK (decl);
2483 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2484 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2486 DECL_ARTIFICIAL (guard) = 1;
2487 DECL_IGNORED_P (guard) = 1;
2488 TREE_USED (guard) = 1;
2489 pushdecl_top_level_and_finish (guard, NULL_TREE);
2494 /* Return those bits of the GUARD variable that should be set when the
2495 guarded entity is actually initialized. */
2498 get_guard_bits (tree guard)
2500 if (!targetm.cxx.guard_mask_bit ())
2502 /* We only set the first byte of the guard, in order to leave room
2503 for a mutex in the high-order bits. */
2504 guard = build1 (ADDR_EXPR,
2505 build_pointer_type (TREE_TYPE (guard)),
2507 guard = build1 (NOP_EXPR,
2508 build_pointer_type (char_type_node),
2510 guard = build1 (INDIRECT_REF, char_type_node, guard);
2516 /* Return an expression which determines whether or not the GUARD
2517 variable has already been initialized. */
2520 get_guard_cond (tree guard)
2524 /* Check to see if the GUARD is zero. */
2525 guard = get_guard_bits (guard);
2527 /* Mask off all but the low bit. */
2528 if (targetm.cxx.guard_mask_bit ())
2530 guard_value = integer_one_node;
2531 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2532 guard_value = convert (TREE_TYPE (guard), guard_value);
2533 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value,
2534 tf_warning_or_error);
2537 guard_value = integer_zero_node;
2538 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2539 guard_value = convert (TREE_TYPE (guard), guard_value);
2540 return cp_build_binary_op (EQ_EXPR, guard, guard_value,
2541 tf_warning_or_error);
2544 /* Return an expression which sets the GUARD variable, indicating that
2545 the variable being guarded has been initialized. */
2548 set_guard (tree guard)
2552 /* Set the GUARD to one. */
2553 guard = get_guard_bits (guard);
2554 guard_init = integer_one_node;
2555 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2556 guard_init = convert (TREE_TYPE (guard), guard_init);
2557 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2558 tf_warning_or_error);
2561 /* Start the process of running a particular set of global constructors
2562 or destructors. Subroutine of do_[cd]tors. */
2565 start_objects (int method_type, int initp)
2571 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2573 if (initp != DEFAULT_INIT_PRIORITY)
2583 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2586 sprintf (type, "%c", method_type);
2588 fndecl = build_lang_decl (FUNCTION_DECL,
2589 get_file_function_name (type),
2590 build_function_type (void_type_node,
2592 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2594 TREE_PUBLIC (current_function_decl) = 0;
2596 /* Mark as artificial because it's not explicitly in the user's
2598 DECL_ARTIFICIAL (current_function_decl) = 1;
2600 /* Mark this declaration as used to avoid spurious warnings. */
2601 TREE_USED (current_function_decl) = 1;
2603 /* Mark this function as a global constructor or destructor. */
2604 if (method_type == 'I')
2605 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2607 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2608 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2610 body = begin_compound_stmt (BCS_FN_BODY);
2615 /* Finish the process of running a particular set of global constructors
2616 or destructors. Subroutine of do_[cd]tors. */
2619 finish_objects (int method_type, int initp, tree body)
2624 finish_compound_stmt (body);
2625 fn = finish_function (0);
2627 if (method_type == 'I')
2629 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2630 decl_init_priority_insert (fn, initp);
2634 DECL_STATIC_DESTRUCTOR (fn) = 1;
2635 decl_fini_priority_insert (fn, initp);
2638 expand_or_defer_fn (fn);
2641 /* The names of the parameters to the function created to handle
2642 initializations and destructions for objects with static storage
2644 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2645 #define PRIORITY_IDENTIFIER "__priority"
2647 /* The name of the function we create to handle initializations and
2648 destructions for objects with static storage duration. */
2649 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2651 /* The declaration for the __INITIALIZE_P argument. */
2652 static GTY(()) tree initialize_p_decl;
2654 /* The declaration for the __PRIORITY argument. */
2655 static GTY(()) tree priority_decl;
2657 /* The declaration for the static storage duration function. */
2658 static GTY(()) tree ssdf_decl;
2660 /* All the static storage duration functions created in this
2661 translation unit. */
2662 static GTY(()) VEC(tree,gc) *ssdf_decls;
2664 /* A map from priority levels to information about that priority
2665 level. There may be many such levels, so efficient lookup is
2667 static splay_tree priority_info_map;
2669 /* Begins the generation of the function that will handle all
2670 initialization and destruction of objects with static storage
2671 duration. The function generated takes two parameters of type
2672 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2673 nonzero, it performs initializations. Otherwise, it performs
2674 destructions. It only performs those initializations or
2675 destructions with the indicated __PRIORITY. The generated function
2678 It is assumed that this function will only be called once per
2679 translation unit. */
2682 start_static_storage_duration_function (unsigned count)
2687 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2689 /* Create the identifier for this function. It will be of the form
2690 SSDF_IDENTIFIER_<number>. */
2691 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2693 /* Create the parameters. */
2694 parm_types = void_list_node;
2695 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2696 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2697 type = build_function_type (void_type_node, parm_types);
2699 /* Create the FUNCTION_DECL itself. */
2700 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2701 get_identifier (id),
2703 TREE_PUBLIC (ssdf_decl) = 0;
2704 DECL_ARTIFICIAL (ssdf_decl) = 1;
2706 /* Put this function in the list of functions to be called from the
2707 static constructors and destructors. */
2710 ssdf_decls = VEC_alloc (tree, gc, 32);
2712 /* Take this opportunity to initialize the map from priority
2713 numbers to information about that priority level. */
2714 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2715 /*delete_key_fn=*/0,
2716 /*delete_value_fn=*/
2717 (splay_tree_delete_value_fn) &free);
2719 /* We always need to generate functions for the
2720 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2721 priorities later, we'll be sure to find the
2722 DEFAULT_INIT_PRIORITY. */
2723 get_priority_info (DEFAULT_INIT_PRIORITY);
2726 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2728 /* Create the argument list. */
2729 initialize_p_decl = cp_build_parm_decl
2730 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2731 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2732 TREE_USED (initialize_p_decl) = 1;
2733 priority_decl = cp_build_parm_decl
2734 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2735 DECL_CONTEXT (priority_decl) = ssdf_decl;
2736 TREE_USED (priority_decl) = 1;
2738 TREE_CHAIN (initialize_p_decl) = priority_decl;
2739 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2741 /* Put the function in the global scope. */
2742 pushdecl (ssdf_decl);
2744 /* Start the function itself. This is equivalent to declaring the
2747 static void __ssdf (int __initialize_p, init __priority_p);
2749 It is static because we only need to call this function from the
2750 various constructor and destructor functions for this module. */
2751 start_preparsed_function (ssdf_decl,
2752 /*attrs=*/NULL_TREE,
2755 /* Set up the scope of the outermost block in the function. */
2756 body = begin_compound_stmt (BCS_FN_BODY);
2761 /* Finish the generation of the function which performs initialization
2762 and destruction of objects with static storage duration. After
2763 this point, no more such objects can be created. */
2766 finish_static_storage_duration_function (tree body)
2768 /* Close out the function. */
2769 finish_compound_stmt (body);
2770 expand_or_defer_fn (finish_function (0));
2773 /* Return the information about the indicated PRIORITY level. If no
2774 code to handle this level has yet been generated, generate the
2775 appropriate prologue. */
2777 static priority_info
2778 get_priority_info (int priority)
2783 n = splay_tree_lookup (priority_info_map,
2784 (splay_tree_key) priority);
2787 /* Create a new priority information structure, and insert it
2789 pi = XNEW (struct priority_info_s);
2790 pi->initializations_p = 0;
2791 pi->destructions_p = 0;
2792 splay_tree_insert (priority_info_map,
2793 (splay_tree_key) priority,
2794 (splay_tree_value) pi);
2797 pi = (priority_info) n->value;
2802 /* The effective initialization priority of a DECL. */
2804 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2805 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2806 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2808 /* Whether a DECL needs a guard to protect it against multiple
2811 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2812 || DECL_ONE_ONLY (decl) \
2813 || DECL_WEAK (decl)))
2815 /* Called from one_static_initialization_or_destruction(),
2817 Walks the initializer list of a global variable and looks for
2818 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2819 and that have their DECL_CONTEXT() == NULL.
2820 For each such temporary variable, set their DECL_CONTEXT() to
2821 the current function. This is necessary because otherwise
2822 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2823 when trying to refer to a temporary variable that does not have
2824 it's DECL_CONTECT() properly set. */
2826 fix_temporary_vars_context_r (tree *node,
2827 int *unused ATTRIBUTE_UNUSED,
2828 void *unused1 ATTRIBUTE_UNUSED)
2830 gcc_assert (current_function_decl);
2832 if (TREE_CODE (*node) == BIND_EXPR)
2836 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2837 if (TREE_CODE (var) == VAR_DECL
2839 && DECL_ARTIFICIAL (var)
2840 && !DECL_CONTEXT (var))
2841 DECL_CONTEXT (var) = current_function_decl;
2847 /* Set up to handle the initialization or destruction of DECL. If
2848 INITP is nonzero, we are initializing the variable. Otherwise, we
2849 are destroying it. */
2852 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2854 tree guard_if_stmt = NULL_TREE;
2857 /* If we are supposed to destruct and there's a trivial destructor,
2858 nothing has to be done. */
2860 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2863 /* Trick the compiler into thinking we are at the file and line
2864 where DECL was declared so that error-messages make sense, and so
2865 that the debugger will show somewhat sensible file and line
2867 input_location = DECL_SOURCE_LOCATION (decl);
2869 /* Make sure temporary variables in the initialiser all have
2870 their DECL_CONTEXT() set to a value different from NULL_TREE.
2871 This can happen when global variables initialisers are built.
2872 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2873 the temporary variables that might have been generated in the
2874 accompagning initialisers is NULL_TREE, meaning the variables have been
2875 declared in the global namespace.
2876 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2877 of the temporaries are set to the current function decl. */
2878 cp_walk_tree_without_duplicates (&init,
2879 fix_temporary_vars_context_r,
2886 Access control for implicit calls to the constructors,
2887 the conversion functions, or the destructor called to
2888 create and destroy a static data member is performed as
2889 if these calls appeared in the scope of the member's
2892 we pretend we are in a static member function of the class of
2893 which the DECL is a member. */
2894 if (member_p (decl))
2896 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2897 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2900 /* Assume we don't need a guard. */
2902 /* We need a guard if this is an object with external linkage that
2903 might be initialized in more than one place. (For example, a
2904 static data member of a template, when the data member requires
2906 if (NEEDS_GUARD_P (decl))
2910 guard = get_guard (decl);
2912 /* When using __cxa_atexit, we just check the GUARD as we would
2913 for a local static. */
2914 if (flag_use_cxa_atexit)
2916 /* When using __cxa_atexit, we never try to destroy
2917 anything from a static destructor. */
2919 guard_cond = get_guard_cond (guard);
2921 /* If we don't have __cxa_atexit, then we will be running
2922 destructors from .fini sections, or their equivalents. So,
2923 we need to know how many times we've tried to initialize this
2924 object. We do initializations only if the GUARD is zero,
2925 i.e., if we are the first to initialize the variable. We do
2926 destructions only if the GUARD is one, i.e., if we are the
2927 last to destroy the variable. */
2930 = cp_build_binary_op (EQ_EXPR,
2931 cp_build_unary_op (PREINCREMENT_EXPR,
2934 tf_warning_or_error),
2936 tf_warning_or_error);
2939 = cp_build_binary_op (EQ_EXPR,
2940 cp_build_unary_op (PREDECREMENT_EXPR,
2943 tf_warning_or_error),
2945 tf_warning_or_error);
2947 guard_if_stmt = begin_if_stmt ();
2948 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2952 /* If we're using __cxa_atexit, we have not already set the GUARD,
2953 so we must do so now. */
2954 if (guard && initp && flag_use_cxa_atexit)
2955 finish_expr_stmt (set_guard (guard));
2957 /* Perform the initialization or destruction. */
2961 finish_expr_stmt (init);
2963 /* If we're using __cxa_atexit, register a function that calls the
2964 destructor for the object. */
2965 if (flag_use_cxa_atexit)
2966 finish_expr_stmt (register_dtor_fn (decl));
2969 finish_expr_stmt (build_cleanup (decl));
2971 /* Finish the guard if-stmt, if necessary. */
2974 finish_then_clause (guard_if_stmt);
2975 finish_if_stmt (guard_if_stmt);
2978 /* Now that we're done with DECL we don't need to pretend to be a
2979 member of its class any longer. */
2980 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2981 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2984 /* Generate code to do the initialization or destruction of the decls in VARS,
2985 a TREE_LIST of VAR_DECL with static storage duration.
2986 Whether initialization or destruction is performed is specified by INITP. */
2989 do_static_initialization_or_destruction (tree vars, bool initp)
2991 tree node, init_if_stmt, cond;
2993 /* Build the outer if-stmt to check for initialization or destruction. */
2994 init_if_stmt = begin_if_stmt ();
2995 cond = initp ? integer_one_node : integer_zero_node;
2996 cond = cp_build_binary_op (EQ_EXPR,
2999 tf_warning_or_error);
3000 finish_if_stmt_cond (cond, init_if_stmt);
3004 tree decl = TREE_VALUE (node);
3005 tree priority_if_stmt;
3009 /* If we don't need a destructor, there's nothing to do. Avoid
3010 creating a possibly empty if-stmt. */
3011 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3013 node = TREE_CHAIN (node);
3017 /* Remember that we had an initialization or finalization at this
3019 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3020 pi = get_priority_info (priority);
3022 pi->initializations_p = 1;
3024 pi->destructions_p = 1;
3026 /* Conditionalize this initialization on being in the right priority
3027 and being initializing/finalizing appropriately. */
3028 priority_if_stmt = begin_if_stmt ();
3029 cond = cp_build_binary_op (EQ_EXPR,
3031 build_int_cst (NULL_TREE, priority),
3032 tf_warning_or_error);
3033 finish_if_stmt_cond (cond, priority_if_stmt);
3035 /* Process initializers with same priority. */
3037 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3038 node = TREE_CHAIN (node))
3039 /* Do one initialization or destruction. */
3040 one_static_initialization_or_destruction (TREE_VALUE (node),
3041 TREE_PURPOSE (node), initp);
3043 /* Finish up the priority if-stmt body. */
3044 finish_then_clause (priority_if_stmt);
3045 finish_if_stmt (priority_if_stmt);
3049 /* Finish up the init/destruct if-stmt body. */
3050 finish_then_clause (init_if_stmt);
3051 finish_if_stmt (init_if_stmt);
3054 /* VARS is a list of variables with static storage duration which may
3055 need initialization and/or finalization. Remove those variables
3056 that don't really need to be initialized or finalized, and return
3057 the resulting list. The order in which the variables appear in
3058 VARS is in reverse order of the order in which they should actually
3059 be initialized. The list we return is in the unreversed order;
3060 i.e., the first variable should be initialized first. */
3063 prune_vars_needing_no_initialization (tree *vars)
3066 tree result = NULL_TREE;
3071 tree decl = TREE_VALUE (t);
3072 tree init = TREE_PURPOSE (t);
3074 /* Deal gracefully with error. */
3075 if (decl == error_mark_node)
3077 var = &TREE_CHAIN (t);
3081 /* The only things that can be initialized are variables. */
3082 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3084 /* If this object is not defined, we don't need to do anything
3086 if (DECL_EXTERNAL (decl))
3088 var = &TREE_CHAIN (t);
3092 /* Also, if the initializer already contains errors, we can bail
3094 if (init && TREE_CODE (init) == TREE_LIST
3095 && value_member (error_mark_node, init))
3097 var = &TREE_CHAIN (t);
3101 /* This variable is going to need initialization and/or
3102 finalization, so we add it to the list. */
3103 *var = TREE_CHAIN (t);
3104 TREE_CHAIN (t) = result;
3111 /* Make sure we have told the back end about all the variables in
3115 write_out_vars (tree vars)
3119 for (v = vars; v; v = TREE_CHAIN (v))
3121 tree var = TREE_VALUE (v);
3122 if (!var_finalized_p (var))
3124 import_export_decl (var);
3125 rest_of_decl_compilation (var, 1, 1);
3130 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3131 (otherwise) that will initialize all global objects with static
3132 storage duration having the indicated PRIORITY. */
3135 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3144 input_location = *locus;
3146 /* Was: locus->line++; */
3148 /* We use `I' to indicate initialization and `D' to indicate
3150 function_key = constructor_p ? 'I' : 'D';
3152 /* We emit the function lazily, to avoid generating empty
3153 global constructors and destructors. */
3156 /* For Objective-C++, we may need to initialize metadata found in this module.
3157 This must be done _before_ any other static initializations. */
3158 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3159 && constructor_p && objc_static_init_needed_p ())
3161 body = start_objects (function_key, priority);
3162 objc_generate_static_init_call (NULL_TREE);
3165 /* Call the static storage duration function with appropriate
3167 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3169 /* Calls to pure or const functions will expand to nothing. */
3170 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3173 body = start_objects (function_key, priority);
3175 arguments = tree_cons (NULL_TREE,
3176 build_int_cst (NULL_TREE, priority),
3178 arguments = tree_cons (NULL_TREE,
3179 build_int_cst (NULL_TREE, constructor_p),
3181 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3182 tf_warning_or_error));
3186 /* Close out the function. */
3188 finish_objects (function_key, priority, body);
3191 /* Generate constructor and destructor functions for the priority
3195 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3197 location_t *locus = (location_t *) data;
3198 int priority = (int) n->key;
3199 priority_info pi = (priority_info) n->value;
3201 /* Generate the functions themselves, but only if they are really
3203 if (pi->initializations_p)
3204 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3205 if (pi->destructions_p)
3206 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3208 /* Keep iterating. */
3212 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3213 decls referenced from front-end specific constructs; it will be called
3214 only for language-specific tree nodes.
3216 Here we must deal with member pointers. */
3219 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3223 switch (TREE_CODE (t))
3226 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3227 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3230 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3231 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3234 if (DECL_VTABLE_OR_VTT_P (t))
3236 /* The ABI requires that all virtual tables be emitted
3237 whenever one of them is. */
3239 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3241 vtbl = TREE_CHAIN (vtbl))
3242 mark_decl_referenced (vtbl);
3244 else if (DECL_CONTEXT (t)
3245 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3246 /* If we need a static variable in a function, then we
3247 need the containing function. */
3248 mark_decl_referenced (DECL_CONTEXT (t));
3257 /* Java requires that we be able to reference a local address for a
3258 method, and not be confused by PLT entries. If hidden aliases are
3259 supported, emit one for each java function that we've emitted. */
3262 build_java_method_aliases (void)
3264 struct cgraph_node *node;
3266 #ifndef HAVE_GAS_HIDDEN
3270 for (node = cgraph_nodes; node ; node = node->next)
3272 tree fndecl = node->decl;
3274 if (TREE_ASM_WRITTEN (fndecl)
3275 && DECL_CONTEXT (fndecl)
3276 && TYPE_P (DECL_CONTEXT (fndecl))
3277 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3278 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3280 /* Mangle the name in a predictable way; we need to reference
3281 this from a java compiled object file. */
3282 tree oid, nid, alias;
3286 oid = DECL_ASSEMBLER_NAME (fndecl);
3287 oname = IDENTIFIER_POINTER (oid);
3288 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3289 nname = ACONCAT (("_ZGA", oname+2, NULL));
3290 nid = get_identifier (nname);
3292 alias = make_alias_for (fndecl, nid);
3293 TREE_PUBLIC (alias) = 1;
3294 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3296 assemble_alias (alias, oid);
3301 /* This routine is called at the end of compilation.
3302 Its job is to create all the code needed to initialize and
3303 destroy the global aggregates. We do the destruction
3304 first, since that way we only need to reverse the decls once. */
3307 cp_write_global_declarations (void)
3313 unsigned ssdf_count = 0;
3317 locus = input_location;
3320 /* Bad parse errors. Just forget about it. */
3321 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3325 c_common_write_pch ();
3327 /* FIXME - huh? was input_line -= 1;*/
3329 /* We now have to write out all the stuff we put off writing out.
3332 o Template specializations that we have not yet instantiated,
3333 but which are needed.
3334 o Initialization and destruction for non-local objects with
3335 static storage duration. (Local objects with static storage
3336 duration are initialized when their scope is first entered,
3337 and are cleaned up via atexit.)
3338 o Virtual function tables.
3340 All of these may cause others to be needed. For example,
3341 instantiating one function may cause another to be needed, and
3342 generating the initializer for an object may cause templates to be
3343 instantiated, etc., etc. */
3345 timevar_push (TV_VARCONST);
3347 emit_support_tinfos ();
3356 /* If there are templates that we've put off instantiating, do
3358 instantiate_pending_templates (retries);
3361 /* Write out virtual tables as required. Note that writing out
3362 the virtual table for a template class may cause the
3363 instantiation of members of that class. If we write out
3364 vtables then we remove the class from our list so we don't
3365 have to look at it again. */
3367 while (keyed_classes != NULL_TREE
3368 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3371 keyed_classes = TREE_CHAIN (keyed_classes);
3377 tree next = TREE_CHAIN (t);
3381 if (maybe_emit_vtables (TREE_VALUE (next)))
3384 TREE_CHAIN (t) = TREE_CHAIN (next);
3389 next = TREE_CHAIN (t);
3393 /* Write out needed type info variables. We have to be careful
3394 looping through unemitted decls, because emit_tinfo_decl may
3395 cause other variables to be needed. New elements will be
3396 appended, and we remove from the vector those that actually
3398 for (i = VEC_length (tree, unemitted_tinfo_decls);
3399 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3400 if (emit_tinfo_decl (t))
3403 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3406 /* The list of objects with static storage duration is built up
3407 in reverse order. We clear STATIC_AGGREGATES so that any new
3408 aggregates added during the initialization of these will be
3409 initialized in the correct order when we next come around the
3411 vars = prune_vars_needing_no_initialization (&static_aggregates);
3415 /* We need to start a new initialization function each time
3416 through the loop. That's because we need to know which
3417 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3418 isn't computed until a function is finished, and written
3419 out. That's a deficiency in the back end. When this is
3420 fixed, these initialization functions could all become
3421 inline, with resulting performance improvements. */
3424 /* Set the line and file, so that it is obviously not from
3426 input_location = locus;
3427 ssdf_body = start_static_storage_duration_function (ssdf_count);
3429 /* Make sure the back end knows about all the variables. */
3430 write_out_vars (vars);
3432 /* First generate code to do all the initializations. */
3434 do_static_initialization_or_destruction (vars, /*initp=*/true);
3436 /* Then, generate code to do all the destructions. Do these
3437 in reverse order so that the most recently constructed
3438 variable is the first destroyed. If we're using
3439 __cxa_atexit, then we don't need to do this; functions
3440 were registered at initialization time to destroy the
3442 if (!flag_use_cxa_atexit && vars)
3444 vars = nreverse (vars);
3445 do_static_initialization_or_destruction (vars, /*initp=*/false);
3450 /* Finish up the static storage duration function for this
3452 input_location = locus;
3453 finish_static_storage_duration_function (ssdf_body);
3455 /* All those initializations and finalizations might cause
3456 us to need more inline functions, more template
3457 instantiations, etc. */
3460 /* ??? was: locus.line++; */
3463 /* Go through the set of inline functions whose bodies have not
3464 been emitted yet. If out-of-line copies of these functions
3465 are required, emit them. */
3466 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3468 /* Does it need synthesizing? */
3469 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3470 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3472 /* Even though we're already at the top-level, we push
3473 there again. That way, when we pop back a few lines
3474 hence, all of our state is restored. Otherwise,
3475 finish_function doesn't clean things up, and we end
3476 up with CURRENT_FUNCTION_DECL set. */
3477 push_to_top_level ();
3478 /* The decl's location will mark where it was first
3479 needed. Save that so synthesize method can indicate
3480 where it was needed from, in case of error */
3481 input_location = DECL_SOURCE_LOCATION (decl);
3482 synthesize_method (decl);
3483 pop_from_top_level ();
3487 if (!gimple_body (decl))
3490 /* We lie to the back end, pretending that some functions
3491 are not defined when they really are. This keeps these
3492 functions from being put out unnecessarily. But, we must
3493 stop lying when the functions are referenced, or if they
3494 are not comdat since they need to be put out now. If
3495 DECL_INTERFACE_KNOWN, then we have already set
3496 DECL_EXTERNAL appropriately, so there's no need to check
3497 again, and we do not want to clear DECL_EXTERNAL if a
3498 previous call to import_export_decl set it.
3500 This is done in a separate for cycle, because if some
3501 deferred function is contained in another deferred
3502 function later in deferred_fns varray,
3503 rest_of_compilation would skip this function and we
3504 really cannot expand the same function twice. */
3505 import_export_decl (decl);
3506 if (DECL_NOT_REALLY_EXTERN (decl)
3507 && DECL_INITIAL (decl)
3508 && decl_needed_p (decl))
3509 DECL_EXTERNAL (decl) = 0;
3511 /* If we're going to need to write this function out, and
3512 there's already a body for it, create RTL for it now.
3513 (There might be no body if this is a method we haven't
3514 gotten around to synthesizing yet.) */
3515 if (!DECL_EXTERNAL (decl)
3516 && decl_needed_p (decl)
3517 && !TREE_ASM_WRITTEN (decl)
3518 && !cgraph_node (decl)->local.finalized)
3520 /* We will output the function; no longer consider it in this
3522 DECL_DEFER_OUTPUT (decl) = 0;
3523 /* Generate RTL for this function now that we know we
3525 expand_or_defer_fn (decl);
3526 /* If we're compiling -fsyntax-only pretend that this
3527 function has been written out so that we don't try to
3529 if (flag_syntax_only)
3530 TREE_ASM_WRITTEN (decl) = 1;
3535 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3538 /* Static data members are just like namespace-scope globals. */
3539 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3541 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3542 /* Don't write it out if we haven't seen a definition. */
3543 || DECL_IN_AGGR_P (decl))
3545 import_export_decl (decl);
3546 /* If this static data member is needed, provide it to the
3548 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3549 DECL_EXTERNAL (decl) = 0;
3551 if (VEC_length (tree, pending_statics) != 0
3552 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3553 VEC_length (tree, pending_statics)))
3560 /* All used inline functions must have a definition at this point. */
3561 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3563 if (/* Check online inline functions that were actually used. */
3564 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3565 /* If the definition actually was available here, then the
3566 fact that the function was not defined merely represents
3567 that for some reason (use of a template repository,
3568 #pragma interface, etc.) we decided not to emit the
3570 && !DECL_INITIAL (decl)
3571 /* An explicit instantiation can be used to specify
3572 that the body is in another unit. It will have
3573 already verified there was a definition. */
3574 && !DECL_EXPLICIT_INSTANTIATION (decl))
3576 warning (0, "inline function %q+D used but never defined", decl);
3577 /* Avoid a duplicate warning from check_global_declaration_1. */
3578 TREE_NO_WARNING (decl) = 1;
3582 /* We give C linkage to static constructors and destructors. */
3583 push_lang_context (lang_name_c);
3585 /* Generate initialization and destruction functions for all
3586 priorities for which they are required. */
3587 if (priority_info_map)
3588 splay_tree_foreach (priority_info_map,
3589 generate_ctor_and_dtor_functions_for_priority,
3591 else if (c_dialect_objc () && objc_static_init_needed_p ())
3592 /* If this is obj-c++ and we need a static init, call
3593 generate_ctor_or_dtor_function. */
3594 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3595 DEFAULT_INIT_PRIORITY, &locus);
3597 /* We're done with the splay-tree now. */
3598 if (priority_info_map)
3599 splay_tree_delete (priority_info_map);
3601 /* Generate any missing aliases. */
3602 maybe_apply_pending_pragma_weaks ();
3604 /* We're done with static constructors, so we can go back to "C++"
3606 pop_lang_context ();
3608 cgraph_finalize_compilation_unit ();
3611 /* Now, issue warnings about static, but not defined, functions,
3612 etc., and emit debugging information. */
3613 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3614 if (VEC_length (tree, pending_statics) != 0)
3616 check_global_declarations (VEC_address (tree, pending_statics),
3617 VEC_length (tree, pending_statics));
3618 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3619 VEC_length (tree, pending_statics));
3622 /* Generate hidden aliases for Java. */
3623 build_java_method_aliases ();
3627 /* The entire file is now complete. If requested, dump everything
3631 FILE *stream = dump_begin (TDI_tu, &flags);
3635 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3636 dump_end (TDI_tu, stream);
3640 timevar_pop (TV_VARCONST);
3642 if (flag_detailed_statistics)
3644 dump_tree_statistics ();
3645 dump_time_statistics ();
3647 input_location = locus;
3649 #ifdef ENABLE_CHECKING
3650 validate_conversion_obstack ();
3651 #endif /* ENABLE_CHECKING */
3654 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3655 function to call in parse-tree form; it has not yet been
3656 semantically analyzed. ARGS are the arguments to the function.
3657 They have already been semantically analyzed. */
3660 build_offset_ref_call_from_tree (tree fn, tree args)
3669 object = TREE_OPERAND (fn, 0);
3671 if (processing_template_decl)
3673 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3674 || TREE_CODE (fn) == MEMBER_REF);
3675 if (type_dependent_expression_p (fn)
3676 || any_type_dependent_arguments_p (args))
3677 return build_nt_call_list (fn, args);
3679 /* Transform the arguments and add the implicit "this"
3680 parameter. That must be done before the FN is transformed
3681 because we depend on the form of FN. */
3682 args = build_non_dependent_args (args);
3683 object = build_non_dependent_expr (object);
3684 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3685 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3686 args = tree_cons (NULL_TREE, object, args);
3687 /* Now that the arguments are done, transform FN. */
3688 fn = build_non_dependent_expr (fn);
3691 /* A qualified name corresponding to a bound pointer-to-member is
3692 represented as an OFFSET_REF:
3694 struct B { void g(); };
3696 void B::g() { (this->*p)(); } */
3697 if (TREE_CODE (fn) == OFFSET_REF)
3699 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3700 tf_warning_or_error);
3701 fn = TREE_OPERAND (fn, 1);
3702 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3703 args = tree_cons (NULL_TREE, object_addr, args);
3706 expr = cp_build_function_call (fn, args, tf_warning_or_error);
3707 if (processing_template_decl && expr != error_mark_node)
3708 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3714 check_default_args (tree x)
3716 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3717 bool saw_def = false;
3718 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3719 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3721 if (TREE_PURPOSE (arg))
3725 error ("default argument missing for parameter %P of %q+#D", i, x);
3726 TREE_PURPOSE (arg) = error_mark_node;
3731 /* Return true if function DECL can be inlined. This is used to force
3732 instantiation of methods that might be interesting for inlining. */
3734 possibly_inlined_p (tree decl)
3736 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3737 if (DECL_UNINLINABLE (decl))
3740 return DECL_DECLARED_INLINE_P (decl);
3741 /* When optimizing, we might inline everything when flatten
3742 attribute or heuristics inlining for size or autoinlining
3747 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3748 If DECL is a specialization or implicitly declared class member,
3749 generate the actual definition. */
3752 mark_used (tree decl)
3754 HOST_WIDE_INT saved_processing_template_decl = 0;
3756 /* If DECL is a BASELINK for a single function, then treat it just
3757 like the DECL for the function. Otherwise, if the BASELINK is
3758 for an overloaded function, we don't know which function was
3759 actually used until after overload resolution. */
3760 if (TREE_CODE (decl) == BASELINK)
3762 decl = BASELINK_FUNCTIONS (decl);
3763 if (really_overloaded_fn (decl))
3765 decl = OVL_CURRENT (decl);
3768 TREE_USED (decl) = 1;
3769 if (DECL_CLONED_FUNCTION_P (decl))
3770 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3771 if (TREE_CODE (decl) == FUNCTION_DECL
3772 && DECL_DELETED_FN (decl))
3774 error ("deleted function %q+D", decl);
3775 error ("used here");
3777 /* If we don't need a value, then we don't need to synthesize DECL. */
3778 if (skip_evaluation)
3781 /* If within finish_function, defer the rest until that function
3782 finishes, otherwise it might recurse. */
3783 if (defer_mark_used_calls)
3785 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
3789 /* Normally, we can wait until instantiation-time to synthesize
3790 DECL. However, if DECL is a static data member initialized with
3791 a constant, we need the value right now because a reference to
3792 such a data member is not value-dependent. */
3793 if (TREE_CODE (decl) == VAR_DECL
3794 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3795 && DECL_CLASS_SCOPE_P (decl))
3797 /* Don't try to instantiate members of dependent types. We
3798 cannot just use dependent_type_p here because this function
3799 may be called from fold_non_dependent_expr, and then we may
3800 see dependent types, even though processing_template_decl
3802 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3803 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3805 /* Pretend that we are not in a template, even if we are, so
3806 that the static data member initializer will be processed. */
3807 saved_processing_template_decl = processing_template_decl;
3808 processing_template_decl = 0;
3811 if (processing_template_decl)
3814 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3815 && !TREE_ASM_WRITTEN (decl))
3816 /* Remember it, so we can check it was defined. */
3818 if (DECL_DEFERRED_FN (decl))
3821 /* Remember the current location for a function we will end up
3822 synthesizing. Then we can inform the user where it was
3823 required in the case of error. */
3824 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3825 && !DECL_THUNK_P (decl))
3826 DECL_SOURCE_LOCATION (decl) = input_location;
3828 note_vague_linkage_fn (decl);
3831 assemble_external (decl);
3833 /* Is it a synthesized method that needs to be synthesized? */
3834 if (TREE_CODE (decl) == FUNCTION_DECL
3835 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3836 && DECL_DEFAULTED_FN (decl)
3837 && !DECL_THUNK_P (decl)
3838 && ! DECL_INITIAL (decl)
3839 /* Kludge: don't synthesize for default args. Unfortunately this
3840 rules out initializers of namespace-scoped objects too, but
3841 it's sort-of ok if the implicit ctor or dtor decl keeps
3842 pointing to the class location. */
3843 && current_function_decl)
3845 synthesize_method (decl);
3846 /* If we've already synthesized the method we don't need to
3847 do the instantiation test below. */
3849 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3850 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3851 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3852 || (TREE_CODE (decl) == FUNCTION_DECL
3853 && possibly_inlined_p
3854 (DECL_TEMPLATE_RESULT (
3855 template_for_substitution (decl))))
3856 /* We need to instantiate static data members so that there
3857 initializers are available in integral constant
3859 || (TREE_CODE (decl) == VAR_DECL
3860 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3861 /* If this is a function or variable that is an instance of some
3862 template, we now know that we will need to actually do the
3863 instantiation. We check that DECL is not an explicit
3864 instantiation because that is not checked in instantiate_decl.
3866 We put off instantiating functions in order to improve compile
3867 times. Maintaining a stack of active functions is expensive,
3868 and the inliner knows to instantiate any functions it might
3869 need. Therefore, we always try to defer instantiation. */
3870 instantiate_decl (decl, /*defer_ok=*/true,
3871 /*expl_inst_class_mem_p=*/false);
3873 processing_template_decl = saved_processing_template_decl;
3876 #include "gt-cp-decl2.h"