1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
56 extern cpp_reader *parse_in;
58 /* This structure contains information about the initializations
59 and/or destructions required for a particular priority level. */
60 typedef struct priority_info_s {
61 /* Nonzero if there have been any initializations at this priority
62 throughout the translation unit. */
63 int initializations_p;
64 /* Nonzero if there have been any destructions at this priority
65 throughout the translation unit. */
69 static void mark_vtable_entries (tree);
70 static bool maybe_emit_vtables (tree);
71 static bool acceptable_java_type (tree);
72 static tree start_objects (int, int);
73 static void finish_objects (int, int, tree);
74 static tree start_static_storage_duration_function (unsigned);
75 static void finish_static_storage_duration_function (tree);
76 static priority_info get_priority_info (int);
77 static void do_static_initialization_or_destruction (tree, bool);
78 static void one_static_initialization_or_destruction (tree, tree, bool);
79 static void generate_ctor_or_dtor_function (bool, int, location_t *);
80 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
82 static tree prune_vars_needing_no_initialization (tree *);
83 static void write_out_vars (tree);
84 static void import_export_class (tree);
85 static tree get_guard_bits (tree);
86 static void determine_visibility_from_class (tree, tree);
88 /* A list of static class variables. This is needed, because a
89 static class variable can be declared inside the class without
90 an initializer, and then initialized, statically, outside the class. */
91 static GTY(()) VEC(tree,gc) *pending_statics;
93 /* A list of functions which were declared inline, but which we
94 may need to emit outline anyway. */
95 static GTY(()) VEC(tree,gc) *deferred_fns;
97 /* Nonzero if we're done parsing and into end-of-file activities. */
103 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
104 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
105 that apply to the function). */
108 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
113 if (fntype == error_mark_node || ctype == error_mark_node)
114 return error_mark_node;
116 type_quals = quals & ~TYPE_QUAL_RESTRICT;
117 ctype = cp_build_qualified_type (ctype, type_quals);
118 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
119 (TREE_CODE (fntype) == METHOD_TYPE
120 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
121 : TYPE_ARG_TYPES (fntype)));
122 raises = TYPE_RAISES_EXCEPTIONS (fntype);
124 fntype = build_exception_variant (fntype, raises);
129 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
133 cp_build_parm_decl (tree name, tree type)
135 tree parm = build_decl (PARM_DECL, name, type);
136 /* DECL_ARG_TYPE is only used by the back end and the back end never
138 if (!processing_template_decl)
139 DECL_ARG_TYPE (parm) = type_passed_as (type);
141 /* If the type is a pack expansion, then we have a function
143 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
144 FUNCTION_PARAMETER_PACK_P (parm) = 1;
149 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
153 build_artificial_parm (tree name, tree type)
155 tree parm = cp_build_parm_decl (name, type);
156 DECL_ARTIFICIAL (parm) = 1;
157 /* All our artificial parms are implicitly `const'; they cannot be
159 TREE_READONLY (parm) = 1;
163 /* Constructors for types with virtual baseclasses need an "in-charge" flag
164 saying whether this constructor is responsible for initialization of
165 virtual baseclasses or not. All destructors also need this "in-charge"
166 flag, which additionally determines whether or not the destructor should
167 free the memory for the object.
169 This function adds the "in-charge" flag to member function FN if
170 appropriate. It is called from grokclassfn and tsubst.
171 FN must be either a constructor or destructor.
173 The in-charge flag follows the 'this' parameter, and is followed by the
174 VTT parm (if any), then the user-written parms. */
177 maybe_retrofit_in_chrg (tree fn)
179 tree basetype, arg_types, parms, parm, fntype;
181 /* If we've already add the in-charge parameter don't do it again. */
182 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
185 /* When processing templates we can't know, in general, whether or
186 not we're going to have virtual baseclasses. */
187 if (processing_template_decl)
190 /* We don't need an in-charge parameter for constructors that don't
191 have virtual bases. */
192 if (DECL_CONSTRUCTOR_P (fn)
193 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
196 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
197 basetype = TREE_TYPE (TREE_VALUE (arg_types));
198 arg_types = TREE_CHAIN (arg_types);
200 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
202 /* If this is a subobject constructor or destructor, our caller will
203 pass us a pointer to our VTT. */
204 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
206 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
208 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
209 TREE_CHAIN (parm) = parms;
212 /* ...and then to TYPE_ARG_TYPES. */
213 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
215 DECL_HAS_VTT_PARM_P (fn) = 1;
218 /* Then add the in-charge parm (before the VTT parm). */
219 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
220 TREE_CHAIN (parm) = parms;
222 arg_types = hash_tree_chain (integer_type_node, arg_types);
224 /* Insert our new parameter(s) into the list. */
225 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
227 /* And rebuild the function type. */
228 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
230 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
231 fntype = build_exception_variant (fntype,
232 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
233 TREE_TYPE (fn) = fntype;
235 /* Now we've got the in-charge parameter. */
236 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
239 /* Classes overload their constituent function names automatically.
240 When a function name is declared in a record structure,
241 its name is changed to it overloaded name. Since names for
242 constructors and destructors can conflict, we place a leading
245 CNAME is the name of the class we are grokking for.
247 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
249 FLAGS contains bits saying what's special about today's
250 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
252 If FUNCTION is a destructor, then we must add the `auto-delete' field
253 as a second parameter. There is some hair associated with the fact
254 that we must "declare" this variable in the manner consistent with the
255 way the rest of the arguments were declared.
257 QUALS are the qualifiers for the this pointer. */
260 grokclassfn (tree ctype, tree function, enum overload_flags flags)
262 tree fn_name = DECL_NAME (function);
264 /* Even within an `extern "C"' block, members get C++ linkage. See
265 [dcl.link] for details. */
266 SET_DECL_LANGUAGE (function, lang_cplusplus);
268 if (fn_name == NULL_TREE)
270 error ("name missing for member function");
271 fn_name = get_identifier ("<anonymous>");
272 DECL_NAME (function) = fn_name;
275 DECL_CONTEXT (function) = ctype;
277 if (flags == DTOR_FLAG)
278 DECL_DESTRUCTOR_P (function) = 1;
280 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
281 maybe_retrofit_in_chrg (function);
284 /* Create an ARRAY_REF, checking for the user doing things backwards
288 grok_array_decl (tree array_expr, tree index_exp)
292 tree orig_array_expr = array_expr;
293 tree orig_index_exp = index_exp;
295 if (error_operand_p (array_expr) || error_operand_p (index_exp))
296 return error_mark_node;
298 if (processing_template_decl)
300 if (type_dependent_expression_p (array_expr)
301 || type_dependent_expression_p (index_exp))
302 return build_min_nt (ARRAY_REF, array_expr, index_exp,
303 NULL_TREE, NULL_TREE);
304 array_expr = build_non_dependent_expr (array_expr);
305 index_exp = build_non_dependent_expr (index_exp);
308 type = TREE_TYPE (array_expr);
310 type = non_reference (type);
312 /* If they have an `operator[]', use that. */
313 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
314 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
315 array_expr, index_exp, NULL_TREE,
316 /*overloaded_p=*/NULL, tf_warning_or_error);
321 /* Otherwise, create an ARRAY_REF for a pointer or array type.
322 It is a little-known fact that, if `a' is an array and `i' is
323 an int, you can write `i[a]', which means the same thing as
325 if (TREE_CODE (type) == ARRAY_TYPE)
328 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
330 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
333 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
335 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
337 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
340 if ((p1 && i2) && (i1 && p2))
341 error ("ambiguous conversion for array subscript");
344 array_expr = p1, index_exp = i2;
346 array_expr = p2, index_exp = i1;
349 error ("invalid types %<%T[%T]%> for array subscript",
350 type, TREE_TYPE (index_exp));
351 return error_mark_node;
354 if (array_expr == error_mark_node || index_exp == error_mark_node)
355 error ("ambiguous conversion for array subscript");
357 expr = build_array_ref (array_expr, index_exp, input_location);
359 if (processing_template_decl && expr != error_mark_node)
360 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
361 NULL_TREE, NULL_TREE);
365 /* Given the cast expression EXP, checking out its validity. Either return
366 an error_mark_node if there was an unavoidable error, return a cast to
367 void for trying to delete a pointer w/ the value 0, or return the
368 call to delete. If DOING_VEC is true, we handle things differently
369 for doing an array delete.
370 Implements ARM $5.3.4. This is called from the parser. */
373 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
377 if (exp == error_mark_node)
380 if (processing_template_decl)
382 t = build_min (DELETE_EXPR, void_type_node, exp, size);
383 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
384 DELETE_EXPR_USE_VEC (t) = doing_vec;
385 TREE_SIDE_EFFECTS (t) = 1;
389 /* An array can't have been allocated by new, so complain. */
390 if (TREE_CODE (exp) == VAR_DECL
391 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
392 warning (0, "deleting array %q#D", exp);
394 t = build_expr_type_conversion (WANT_POINTER, exp, true);
396 if (t == NULL_TREE || t == error_mark_node)
398 error ("type %q#T argument given to %<delete%>, expected pointer",
400 return error_mark_node;
403 type = TREE_TYPE (t);
405 /* As of Valley Forge, you can delete a pointer to const. */
407 /* You can't delete functions. */
408 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
410 error ("cannot delete a function. Only pointer-to-objects are "
411 "valid arguments to %<delete%>");
412 return error_mark_node;
415 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
416 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
418 warning (0, "deleting %qT is undefined", type);
422 /* Deleting a pointer with the value zero is valid and has no effect. */
423 if (integer_zerop (t))
424 return build1 (NOP_EXPR, void_type_node, t);
427 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
428 sfk_deleting_destructor,
431 return build_delete (type, t, sfk_deleting_destructor,
432 LOOKUP_NORMAL, use_global_delete);
435 /* Report an error if the indicated template declaration is not the
436 sort of thing that should be a member template. */
439 check_member_template (tree tmpl)
443 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
444 decl = DECL_TEMPLATE_RESULT (tmpl);
446 if (TREE_CODE (decl) == FUNCTION_DECL
447 || (TREE_CODE (decl) == TYPE_DECL
448 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
450 /* The parser rejects template declarations in local classes. */
451 gcc_assert (!current_function_decl);
452 /* The parser rejects any use of virtual in a function template. */
453 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
454 && DECL_VIRTUAL_P (decl)));
456 /* The debug-information generating code doesn't know what to do
457 with member templates. */
458 DECL_IGNORED_P (tmpl) = 1;
461 error ("template declaration of %q#D", decl);
464 /* Return true iff TYPE is a valid Java parameter or return type. */
467 acceptable_java_type (tree type)
469 if (type == error_mark_node)
472 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
474 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
476 type = TREE_TYPE (type);
477 if (TREE_CODE (type) == RECORD_TYPE)
480 if (! TYPE_FOR_JAVA (type))
482 if (! CLASSTYPE_TEMPLATE_INFO (type))
484 args = CLASSTYPE_TI_ARGS (type);
485 i = TREE_VEC_LENGTH (args);
488 type = TREE_VEC_ELT (args, i);
489 if (TREE_CODE (type) == POINTER_TYPE)
490 type = TREE_TYPE (type);
491 if (! TYPE_FOR_JAVA (type))
500 /* For a METHOD in a Java class CTYPE, return true if
501 the parameter and return types are valid Java types.
502 Otherwise, print appropriate error messages, and return false. */
505 check_java_method (tree method)
508 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
509 tree ret_type = TREE_TYPE (TREE_TYPE (method));
511 if (!acceptable_java_type (ret_type))
513 error ("Java method %qD has non-Java return type %qT",
518 arg_types = TREE_CHAIN (arg_types);
519 if (DECL_HAS_IN_CHARGE_PARM_P (method))
520 arg_types = TREE_CHAIN (arg_types);
521 if (DECL_HAS_VTT_PARM_P (method))
522 arg_types = TREE_CHAIN (arg_types);
524 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
526 tree type = TREE_VALUE (arg_types);
527 if (!acceptable_java_type (type))
529 if (type != error_mark_node)
530 error ("Java method %qD has non-Java parameter type %qT",
538 /* Sanity check: report error if this function FUNCTION is not
539 really a member of the class (CTYPE) it is supposed to belong to.
540 TEMPLATE_PARMS is used to specify the template parameters of a member
541 template passed as FUNCTION_DECL. If the member template is passed as a
542 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
543 from the declaration. If the function is not a function template, it
545 It returns the original declaration for the function, NULL_TREE if
546 no declaration was found, error_mark_node if an error was emitted. */
549 check_classfn (tree ctype, tree function, tree template_parms)
555 if (DECL_USE_TEMPLATE (function)
556 && !(TREE_CODE (function) == TEMPLATE_DECL
557 && DECL_TEMPLATE_SPECIALIZATION (function))
558 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
559 /* Since this is a specialization of a member template,
560 we're not going to find the declaration in the class.
563 struct S { template <typename T> void f(T); };
564 template <> void S::f(int);
566 we're not going to find `S::f(int)', but there's no
567 reason we should, either. We let our callers know we didn't
568 find the method, but we don't complain. */
571 /* Basic sanity check: for a template function, the template parameters
572 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
573 if (TREE_CODE (function) == TEMPLATE_DECL)
576 && !comp_template_parms (template_parms,
577 DECL_TEMPLATE_PARMS (function)))
579 error ("template parameter lists provided don't match the "
580 "template parameters of %qD", function);
581 return error_mark_node;
583 template_parms = DECL_TEMPLATE_PARMS (function);
586 /* OK, is this a definition of a member template? */
587 is_template = (template_parms != NULL_TREE);
589 /* We must enter the scope here, because conversion operators are
590 named by target type, and type equivalence relies on typenames
591 resolving within the scope of CTYPE. */
592 pushed_scope = push_scope (ctype);
593 ix = class_method_index_for_fn (complete_type (ctype), function);
596 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
597 tree fndecls, fndecl = 0;
599 const char *format = NULL;
601 for (fndecls = VEC_index (tree, methods, ix);
602 fndecls; fndecls = OVL_NEXT (fndecls))
606 fndecl = OVL_CURRENT (fndecls);
607 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
608 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
610 /* We cannot simply call decls_match because this doesn't
611 work for static member functions that are pretending to
612 be methods, and because the name may have been changed by
615 /* Get rid of the this parameter on functions that become
617 if (DECL_STATIC_FUNCTION_P (fndecl)
618 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
619 p1 = TREE_CHAIN (p1);
621 /* A member template definition only matches a member template
623 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
626 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
627 TREE_TYPE (TREE_TYPE (fndecl)))
628 && compparms (p1, p2)
630 || comp_template_parms (template_parms,
631 DECL_TEMPLATE_PARMS (fndecl)))
632 && (DECL_TEMPLATE_SPECIALIZATION (function)
633 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
634 && (!DECL_TEMPLATE_SPECIALIZATION (function)
635 || (DECL_TI_TEMPLATE (function)
636 == DECL_TI_TEMPLATE (fndecl))))
642 pop_scope (pushed_scope);
643 return OVL_CURRENT (fndecls);
646 error_at (DECL_SOURCE_LOCATION (function),
647 "prototype for %q#D does not match any in class %qT",
649 is_conv_op = DECL_CONV_FN_P (fndecl);
652 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
653 fndecls = VEC_index (tree, methods, ix);
656 fndecl = OVL_CURRENT (fndecls);
657 fndecls = OVL_NEXT (fndecls);
659 if (!fndecls && is_conv_op)
661 if (VEC_length (tree, methods) > (size_t) ++ix)
663 fndecls = VEC_index (tree, methods, ix);
664 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
676 format = N_("candidates are: %+#D");
678 format = N_("candidate is: %+#D");
679 error (format, fndecl);
682 else if (!COMPLETE_TYPE_P (ctype))
683 cxx_incomplete_type_error (function, ctype);
685 error ("no %q#D member function declared in class %qT",
689 pop_scope (pushed_scope);
690 return error_mark_node;
693 /* DECL is a function with vague linkage. Remember it so that at the
694 end of the translation unit we can decide whether or not to emit
698 note_vague_linkage_fn (tree decl)
700 if (!DECL_DEFERRED_FN (decl))
702 DECL_DEFERRED_FN (decl) = 1;
703 DECL_DEFER_OUTPUT (decl) = 1;
704 VEC_safe_push (tree, gc, deferred_fns, decl);
708 /* We have just processed the DECL, which is a static data member.
709 The other parameters are as for cp_finish_decl. */
712 finish_static_data_member_decl (tree decl,
713 tree init, bool init_const_expr_p,
717 DECL_CONTEXT (decl) = current_class_type;
719 /* We cannot call pushdecl here, because that would fill in the
720 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
721 the right thing, namely, to put this decl out straight away. */
723 if (! processing_template_decl)
724 VEC_safe_push (tree, gc, pending_statics, decl);
726 if (LOCAL_CLASS_P (current_class_type))
727 permerror (input_location, "local class %q#T shall not have static data member %q#D",
728 current_class_type, decl);
730 /* Static consts need not be initialized in the class definition. */
731 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
733 static int explained = 0;
735 error ("initializer invalid for static member with constructor");
738 error ("(an out of class initialization is required)");
743 /* Force the compiler to know when an uninitialized static const
744 member is being used. */
745 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
746 TREE_USED (decl) = 1;
747 DECL_INITIAL (decl) = init;
748 DECL_IN_AGGR_P (decl) = 1;
750 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
753 /* DECLARATOR and DECLSPECS correspond to a class member. The other
754 parameters are as for cp_finish_decl. Return the DECL for the
755 class member declared. */
758 grokfield (const cp_declarator *declarator,
759 cp_decl_specifier_seq *declspecs,
760 tree init, bool init_const_expr_p,
765 const char *asmspec = 0;
766 int flags = LOOKUP_ONLYCONVERTING;
769 && TREE_CODE (init) == TREE_LIST
770 && TREE_VALUE (init) == error_mark_node
771 && TREE_CHAIN (init) == NULL_TREE)
774 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
775 if (! value || error_operand_p (value))
776 /* friend or constructor went bad. */
777 return error_mark_node;
779 if (TREE_CODE (value) == TYPE_DECL && init)
781 error ("typedef %qD is initialized (use __typeof__ instead)", value);
785 /* Pass friendly classes back. */
786 if (value == void_type_node)
789 /* Pass friend decls back. */
790 if ((TREE_CODE (value) == FUNCTION_DECL
791 || TREE_CODE (value) == TEMPLATE_DECL)
792 && DECL_CONTEXT (value) != current_class_type)
795 if (DECL_NAME (value) != NULL_TREE
796 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
797 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
798 error ("member %qD conflicts with virtual function table field name",
801 /* Stash away type declarations. */
802 if (TREE_CODE (value) == TYPE_DECL)
804 DECL_NONLOCAL (value) = 1;
805 DECL_CONTEXT (value) = current_class_type;
807 if (processing_template_decl)
808 value = push_template_decl (value);
814 /* If this is a typedef that names the class for linkage purposes
815 (7.1.3p8), apply any attributes directly to the type. */
816 if (TAGGED_TYPE_P (TREE_TYPE (value))
817 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
818 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
820 cplus_decl_attributes (&value, attrlist, attrflags);
826 if (DECL_IN_AGGR_P (value))
828 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
829 return void_type_node;
832 if (asmspec_tree && asmspec_tree != error_mark_node)
833 asmspec = TREE_STRING_POINTER (asmspec_tree);
837 if (TREE_CODE (value) == FUNCTION_DECL)
839 /* Initializers for functions are rejected early in the parser.
840 If we get here, it must be a pure specifier for a method. */
841 if (init == ridpointers[(int)RID_DELETE])
843 DECL_DELETED_FN (value) = 1;
844 DECL_DECLARED_INLINE_P (value) = 1;
845 DECL_INITIAL (value) = error_mark_node;
847 else if (init == ridpointers[(int)RID_DEFAULT])
849 if (!defaultable_fn_p (value))
850 error ("%qD cannot be defaulted", value);
853 DECL_DEFAULTED_FN (value) = 1;
854 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
855 DECL_DECLARED_INLINE_P (value) = 1;
858 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
860 gcc_assert (error_operand_p (init) || integer_zerop (init));
861 DECL_PURE_VIRTUAL_P (value) = 1;
865 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
866 error ("initializer specified for static member function %qD",
870 else if (pedantic && TREE_CODE (value) != VAR_DECL)
871 /* Already complained in grokdeclarator. */
873 else if (!processing_template_decl)
875 if (TREE_CODE (init) == CONSTRUCTOR)
876 init = digest_init (TREE_TYPE (value), init);
878 init = integral_constant_value (init);
880 if (init != error_mark_node && !TREE_CONSTANT (init))
882 /* We can allow references to things that are effectively
883 static, since references are initialized with the
885 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
886 || (TREE_STATIC (init) == 0
887 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
889 error ("field initializer is not constant");
890 init = error_mark_node;
896 if (processing_template_decl
897 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
899 value = push_template_decl (value);
900 if (error_operand_p (value))
901 return error_mark_node;
905 cplus_decl_attributes (&value, attrlist, 0);
907 switch (TREE_CODE (value))
910 finish_static_data_member_decl (value, init, init_const_expr_p,
911 asmspec_tree, flags);
916 error ("%<asm%> specifiers are not permitted on non-static data members");
917 if (DECL_INITIAL (value) == error_mark_node)
918 init = error_mark_node;
919 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
921 DECL_INITIAL (value) = init;
922 DECL_IN_AGGR_P (value) = 1;
927 set_user_assembler_name (value, asmspec);
929 cp_finish_decl (value,
931 /*init_const_expr_p=*/false,
932 asmspec_tree, flags);
934 /* Pass friends back this way. */
935 if (DECL_FRIEND_P (value))
936 return void_type_node;
938 DECL_IN_AGGR_P (value) = 1;
947 /* Like `grokfield', but for bitfields.
948 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
951 grokbitfield (const cp_declarator *declarator,
952 cp_decl_specifier_seq *declspecs, tree width,
955 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
957 if (value == error_mark_node)
958 return NULL_TREE; /* friends went bad. */
960 /* Pass friendly classes back. */
961 if (TREE_CODE (value) == VOID_TYPE)
962 return void_type_node;
964 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
965 && (POINTER_TYPE_P (value)
966 || !dependent_type_p (TREE_TYPE (value))))
968 error ("bit-field %qD with non-integral type", value);
969 return error_mark_node;
972 if (TREE_CODE (value) == TYPE_DECL)
974 error ("cannot declare %qD to be a bit-field type", value);
978 /* Usually, finish_struct_1 catches bitfields with invalid types.
979 But, in the case of bitfields with function type, we confuse
980 ourselves into thinking they are member functions, so we must
982 if (TREE_CODE (value) == FUNCTION_DECL)
984 error ("cannot declare bit-field %qD with function type",
989 if (DECL_IN_AGGR_P (value))
991 error ("%qD is already defined in the class %qT", value,
992 DECL_CONTEXT (value));
993 return void_type_node;
996 if (TREE_STATIC (value))
998 error ("static member %qD cannot be a bit-field", value);
1001 finish_decl (value, NULL_TREE, NULL_TREE);
1003 if (width != error_mark_node)
1005 constant_expression_warning (width);
1006 DECL_INITIAL (value) = width;
1007 SET_DECL_C_BIT_FIELD (value);
1010 DECL_IN_AGGR_P (value) = 1;
1013 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1019 /* Returns true iff ATTR is an attribute which needs to be applied at
1020 instantiation time rather than template definition time. */
1023 is_late_template_attribute (tree attr, tree decl)
1025 tree name = TREE_PURPOSE (attr);
1026 tree args = TREE_VALUE (attr);
1027 const struct attribute_spec *spec = lookup_attribute_spec (name);
1031 /* Unknown attribute. */
1034 /* Attribute weak handling wants to write out assembly right away. */
1035 if (is_attribute_p ("weak", name))
1038 /* If any of the arguments are dependent expressions, we can't evaluate
1039 the attribute until instantiation time. */
1040 for (arg = args; arg; arg = TREE_CHAIN (arg))
1042 tree t = TREE_VALUE (arg);
1044 /* If the first attribute argument is an identifier, only consider
1045 second and following arguments. Attributes like mode, format,
1046 cleanup and several target specific attributes aren't late
1047 just because they have an IDENTIFIER_NODE as first argument. */
1048 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1051 if (value_dependent_expression_p (t)
1052 || type_dependent_expression_p (t))
1056 if (TREE_CODE (decl) == TYPE_DECL
1058 || spec->type_required)
1060 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1062 /* We can't apply any attributes to a completely unknown type until
1063 instantiation time. */
1064 enum tree_code code = TREE_CODE (type);
1065 if (code == TEMPLATE_TYPE_PARM
1066 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1067 || code == TYPENAME_TYPE)
1069 /* Also defer most attributes on dependent types. This is not
1070 necessary in all cases, but is the better default. */
1071 else if (dependent_type_p (type)
1072 /* But attribute visibility specifically works on
1074 && !is_attribute_p ("visibility", name))
1083 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1084 applied at instantiation time and return them. If IS_DEPENDENT is true,
1085 the declaration itself is dependent, so all attributes should be applied
1086 at instantiation time. */
1089 splice_template_attributes (tree *attr_p, tree decl)
1092 tree late_attrs = NULL_TREE;
1093 tree *q = &late_attrs;
1100 if (is_late_template_attribute (*p, decl))
1102 ATTR_IS_DEPENDENT (*p) = 1;
1104 *p = TREE_CHAIN (*p);
1105 q = &TREE_CHAIN (*q);
1109 p = &TREE_CHAIN (*p);
1115 /* Remove any late attributes from the list in ATTR_P and attach them to
1119 save_template_attributes (tree *attr_p, tree *decl_p)
1121 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1123 tree old_attrs = NULL_TREE;
1128 /* Give this type a name so we know to look it up again at instantiation
1130 if (TREE_CODE (*decl_p) == TYPE_DECL
1131 && DECL_ORIGINAL_TYPE (*decl_p) == NULL_TREE)
1133 tree oldt = TREE_TYPE (*decl_p);
1134 tree newt = build_variant_type_copy (oldt);
1135 DECL_ORIGINAL_TYPE (*decl_p) = oldt;
1136 TREE_TYPE (*decl_p) = newt;
1137 TYPE_NAME (newt) = *decl_p;
1138 TREE_USED (newt) = TREE_USED (*decl_p);
1141 if (DECL_P (*decl_p))
1142 q = &DECL_ATTRIBUTES (*decl_p);
1144 q = &TYPE_ATTRIBUTES (*decl_p);
1148 /* Place the late attributes at the beginning of the attribute
1150 TREE_CHAIN (tree_last (late_attrs)) = *q;
1153 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1155 /* We've added new attributes directly to the main variant, so
1156 now we need to update all of the other variants to include
1157 these new attributes. */
1159 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1160 variant = TYPE_NEXT_VARIANT (variant))
1162 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1163 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1168 /* Like reconstruct_complex_type, but handle also template trees. */
1171 cp_reconstruct_complex_type (tree type, tree bottom)
1175 if (TREE_CODE (type) == POINTER_TYPE)
1177 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1178 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1179 TYPE_REF_CAN_ALIAS_ALL (type));
1181 else if (TREE_CODE (type) == REFERENCE_TYPE)
1183 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1184 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1185 TYPE_REF_CAN_ALIAS_ALL (type));
1187 else if (TREE_CODE (type) == ARRAY_TYPE)
1189 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1190 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1191 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1192 element type qualification will be handled by the recursive
1193 cp_reconstruct_complex_type call and cp_build_qualified_type
1194 for ARRAY_TYPEs changes the element type. */
1197 else if (TREE_CODE (type) == FUNCTION_TYPE)
1199 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1200 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1202 else if (TREE_CODE (type) == METHOD_TYPE)
1204 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1205 /* The build_method_type_directly() routine prepends 'this' to argument list,
1206 so we must compensate by getting rid of it. */
1208 = build_method_type_directly
1209 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1211 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1213 else if (TREE_CODE (type) == OFFSET_TYPE)
1215 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1216 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1221 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1224 /* Like decl_attributes, but handle C++ complexity. */
1227 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1229 if (*decl == NULL_TREE || *decl == void_type_node
1230 || *decl == error_mark_node
1231 || attributes == NULL_TREE)
1234 if (processing_template_decl)
1236 if (check_for_bare_parameter_packs (attributes))
1239 save_template_attributes (&attributes, decl);
1240 if (attributes == NULL_TREE)
1244 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1245 decl = &DECL_TEMPLATE_RESULT (*decl);
1247 decl_attributes (decl, attributes, flags);
1249 if (TREE_CODE (*decl) == TYPE_DECL)
1250 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1253 /* Walks through the namespace- or function-scope anonymous union
1254 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1255 Returns one of the fields for use in the mangled name. */
1258 build_anon_union_vars (tree type, tree object)
1260 tree main_decl = NULL_TREE;
1263 /* Rather than write the code to handle the non-union case,
1264 just give an error. */
1265 if (TREE_CODE (type) != UNION_TYPE)
1266 error ("anonymous struct not inside named type");
1268 for (field = TYPE_FIELDS (type);
1270 field = TREE_CHAIN (field))
1275 if (DECL_ARTIFICIAL (field))
1277 if (TREE_CODE (field) != FIELD_DECL)
1279 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1280 "have non-static data members", field);
1284 if (TREE_PRIVATE (field))
1285 permerror (input_location, "private member %q+#D in anonymous union", field);
1286 else if (TREE_PROTECTED (field))
1287 permerror (input_location, "protected member %q+#D in anonymous union", field);
1289 if (processing_template_decl)
1290 ref = build_min_nt (COMPONENT_REF, object,
1291 DECL_NAME (field), NULL_TREE);
1293 ref = build_class_member_access_expr (object, field, NULL_TREE,
1294 false, tf_warning_or_error);
1296 if (DECL_NAME (field))
1300 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1301 DECL_ANON_UNION_VAR_P (decl) = 1;
1303 base = get_base_address (object);
1304 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1305 TREE_STATIC (decl) = TREE_STATIC (base);
1306 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1308 SET_DECL_VALUE_EXPR (decl, ref);
1309 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1311 decl = pushdecl (decl);
1313 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1314 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1318 if (main_decl == NULL_TREE)
1325 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1326 anonymous union, then all members must be laid out together. PUBLIC_P
1327 is nonzero if this union is not declared static. */
1330 finish_anon_union (tree anon_union_decl)
1336 if (anon_union_decl == error_mark_node)
1339 type = TREE_TYPE (anon_union_decl);
1340 public_p = TREE_PUBLIC (anon_union_decl);
1342 /* The VAR_DECL's context is the same as the TYPE's context. */
1343 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1345 if (TYPE_FIELDS (type) == NULL_TREE)
1350 error ("namespace-scope anonymous aggregates must be static");
1354 main_decl = build_anon_union_vars (type, anon_union_decl);
1355 if (main_decl == error_mark_node)
1357 if (main_decl == NULL_TREE)
1359 warning (0, "anonymous union with no members");
1363 if (!processing_template_decl)
1365 /* Use main_decl to set the mangled name. */
1366 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1367 mangle_decl (anon_union_decl);
1368 DECL_NAME (anon_union_decl) = NULL_TREE;
1371 pushdecl (anon_union_decl);
1372 if (building_stmt_tree ()
1373 && at_function_scope_p ())
1374 add_decl_expr (anon_union_decl);
1375 else if (!processing_template_decl)
1376 rest_of_decl_compilation (anon_union_decl,
1377 toplevel_bindings_p (), at_eof);
1380 /* Auxiliary functions to make type signatures for
1381 `operator new' and `operator delete' correspond to
1382 what compiler will be expecting. */
1385 coerce_new_type (tree type)
1388 tree args = TYPE_ARG_TYPES (type);
1390 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1392 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1395 error ("%<operator new%> must return type %qT", ptr_type_node);
1398 if (args && args != void_list_node)
1400 if (TREE_PURPOSE (args))
1402 /* [basic.stc.dynamic.allocation]
1404 The first parameter shall not have an associated default
1406 error ("the first parameter of %<operator new%> cannot "
1407 "have a default argument");
1408 /* Throw away the default argument. */
1409 TREE_PURPOSE (args) = NULL_TREE;
1412 if (!same_type_p (TREE_VALUE (args), size_type_node))
1415 args = TREE_CHAIN (args);
1422 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1423 "as first parameter", size_type_node);
1428 args = tree_cons (NULL_TREE, size_type_node, args);
1431 type = build_exception_variant
1432 (build_function_type (ptr_type_node, args),
1433 TYPE_RAISES_EXCEPTIONS (type));
1441 coerce_delete_type (tree type)
1444 tree args = TYPE_ARG_TYPES (type);
1446 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1448 if (!same_type_p (TREE_TYPE (type), void_type_node))
1451 error ("%<operator delete%> must return type %qT", void_type_node);
1454 if (!args || args == void_list_node
1455 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1458 if (args && args != void_list_node)
1459 args = TREE_CHAIN (args);
1460 error ("%<operator delete%> takes type %qT as first parameter",
1466 args = tree_cons (NULL_TREE, ptr_type_node, args);
1469 type = build_exception_variant
1470 (build_function_type (void_type_node, args),
1471 TYPE_RAISES_EXCEPTIONS (type));
1479 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1480 and mark them as needed. */
1483 mark_vtable_entries (tree decl)
1486 unsigned HOST_WIDE_INT idx;
1488 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1493 STRIP_NOPS (fnaddr);
1495 if (TREE_CODE (fnaddr) != ADDR_EXPR
1496 && TREE_CODE (fnaddr) != FDESC_EXPR)
1497 /* This entry is an offset: a virtual base class offset, a
1498 virtual call offset, an RTTI offset, etc. */
1501 fn = TREE_OPERAND (fnaddr, 0);
1502 TREE_ADDRESSABLE (fn) = 1;
1503 /* When we don't have vcall offsets, we output thunks whenever
1504 we output the vtables that contain them. With vcall offsets,
1505 we know all the thunks we'll need when we emit a virtual
1506 function, so we emit the thunks there instead. */
1507 if (DECL_THUNK_P (fn))
1508 use_thunk (fn, /*emit_p=*/0);
1513 /* Set DECL up to have the closest approximation of "initialized common"
1514 linkage available. */
1517 comdat_linkage (tree decl)
1520 make_decl_one_only (decl);
1521 else if (TREE_CODE (decl) == FUNCTION_DECL
1522 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1523 /* We can just emit function and compiler-generated variables
1524 statically; having multiple copies is (for the most part) only
1527 There are two correctness issues, however: the address of a
1528 template instantiation with external linkage should be the
1529 same, independent of what translation unit asks for the
1530 address, and this will not hold when we emit multiple copies of
1531 the function. However, there's little else we can do.
1533 Also, by default, the typeinfo implementation assumes that
1534 there will be only one copy of the string used as the name for
1535 each type. Therefore, if weak symbols are unavailable, the
1536 run-time library should perform a more conservative check; it
1537 should perform a string comparison, rather than an address
1539 TREE_PUBLIC (decl) = 0;
1542 /* Static data member template instantiations, however, cannot
1543 have multiple copies. */
1544 if (DECL_INITIAL (decl) == 0
1545 || DECL_INITIAL (decl) == error_mark_node)
1546 DECL_COMMON (decl) = 1;
1547 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1549 DECL_COMMON (decl) = 1;
1550 DECL_INITIAL (decl) = error_mark_node;
1552 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1554 /* We can't do anything useful; leave vars for explicit
1556 DECL_EXTERNAL (decl) = 1;
1557 DECL_NOT_REALLY_EXTERN (decl) = 0;
1561 if (DECL_LANG_SPECIFIC (decl))
1562 DECL_COMDAT (decl) = 1;
1565 /* For win32 we also want to put explicit instantiations in
1566 linkonce sections, so that they will be merged with implicit
1567 instantiations; otherwise we get duplicate symbol errors.
1568 For Darwin we do not want explicit instantiations to be
1572 maybe_make_one_only (tree decl)
1574 /* We used to say that this was not necessary on targets that support weak
1575 symbols, because the implicit instantiations will defer to the explicit
1576 one. However, that's not actually the case in SVR4; a strong definition
1577 after a weak one is an error. Also, not making explicit
1578 instantiations one_only means that we can end up with two copies of
1579 some template instantiations. */
1583 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1584 we can get away with not emitting them if they aren't used. We need
1585 to for variables so that cp_finish_decl will update their linkage,
1586 because their DECL_INITIAL may not have been set properly yet. */
1588 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1589 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1590 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1592 make_decl_one_only (decl);
1594 if (TREE_CODE (decl) == VAR_DECL)
1596 DECL_COMDAT (decl) = 1;
1597 /* Mark it needed so we don't forget to emit it. */
1598 mark_decl_referenced (decl);
1603 /* Determine whether or not we want to specifically import or export CTYPE,
1604 using various heuristics. */
1607 import_export_class (tree ctype)
1609 /* -1 for imported, 1 for exported. */
1610 int import_export = 0;
1612 /* It only makes sense to call this function at EOF. The reason is
1613 that this function looks at whether or not the first non-inline
1614 non-abstract virtual member function has been defined in this
1615 translation unit. But, we can't possibly know that until we've
1616 seen the entire translation unit. */
1617 gcc_assert (at_eof);
1619 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1622 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1623 we will have CLASSTYPE_INTERFACE_ONLY set but not
1624 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1625 heuristic because someone will supply a #pragma implementation
1626 elsewhere, and deducing it here would produce a conflict. */
1627 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1630 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1632 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1634 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1635 && !flag_implicit_templates)
1636 /* For a template class, without -fimplicit-templates, check the
1637 repository. If the virtual table is assigned to this
1638 translation unit, then export the class; otherwise, import
1640 import_export = repo_export_class_p (ctype) ? 1 : -1;
1641 else if (TYPE_POLYMORPHIC_P (ctype))
1643 /* The ABI specifies that the virtual table and associated
1644 information are emitted with the key method, if any. */
1645 tree method = CLASSTYPE_KEY_METHOD (ctype);
1646 /* If weak symbol support is not available, then we must be
1647 careful not to emit the vtable when the key function is
1648 inline. An inline function can be defined in multiple
1649 translation units. If we were to emit the vtable in each
1650 translation unit containing a definition, we would get
1651 multiple definition errors at link-time. */
1652 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1653 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1656 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1657 a definition anywhere else. */
1658 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1661 /* Allow back ends the chance to overrule the decision. */
1662 if (targetm.cxx.import_export_class)
1663 import_export = targetm.cxx.import_export_class (ctype, import_export);
1667 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1668 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1672 /* Return true if VAR has already been provided to the back end; in that
1673 case VAR should not be modified further by the front end. */
1675 var_finalized_p (tree var)
1677 return varpool_node (var)->finalized;
1680 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1681 must be emitted in this translation unit. Mark it as such. */
1684 mark_needed (tree decl)
1686 /* It's possible that we no longer need to set
1687 TREE_SYMBOL_REFERENCED here directly, but doing so is
1689 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1690 mark_decl_referenced (decl);
1693 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1694 returns true if a definition of this entity should be provided in
1695 this object file. Callers use this function to determine whether
1696 or not to let the back end know that a definition of DECL is
1697 available in this translation unit. */
1700 decl_needed_p (tree decl)
1702 gcc_assert (TREE_CODE (decl) == VAR_DECL
1703 || TREE_CODE (decl) == FUNCTION_DECL);
1704 /* This function should only be called at the end of the translation
1705 unit. We cannot be sure of whether or not something will be
1706 COMDAT until that point. */
1707 gcc_assert (at_eof);
1709 /* All entities with external linkage that are not COMDAT should be
1710 emitted; they may be referred to from other object files. */
1711 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1713 /* If this entity was used, let the back end see it; it will decide
1714 whether or not to emit it into the object file. */
1715 if (TREE_USED (decl)
1716 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1717 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1719 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1720 reference to DECL might cause it to be emitted later. */
1724 /* If necessary, write out the vtables for the dynamic class CTYPE.
1725 Returns true if any vtables were emitted. */
1728 maybe_emit_vtables (tree ctype)
1734 /* If the vtables for this class have already been emitted there is
1735 nothing more to do. */
1736 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1737 if (var_finalized_p (primary_vtbl))
1739 /* Ignore dummy vtables made by get_vtable_decl. */
1740 if (TREE_TYPE (primary_vtbl) == void_type_node)
1743 /* On some targets, we cannot determine the key method until the end
1744 of the translation unit -- which is when this function is
1746 if (!targetm.cxx.key_method_may_be_inline ())
1747 determine_key_method (ctype);
1749 /* See if any of the vtables are needed. */
1750 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1752 import_export_decl (vtbl);
1753 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1758 /* If the references to this class' vtables are optimized away,
1759 still emit the appropriate debugging information. See
1761 if (DECL_COMDAT (primary_vtbl)
1762 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1763 note_debug_info_needed (ctype);
1767 /* The ABI requires that we emit all of the vtables if we emit any
1769 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1771 /* Mark entities references from the virtual table as used. */
1772 mark_vtable_entries (vtbl);
1774 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1776 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1778 /* It had better be all done at compile-time. */
1783 DECL_EXTERNAL (vtbl) = 0;
1784 rest_of_decl_compilation (vtbl, 1, 1);
1786 /* Because we're only doing syntax-checking, we'll never end up
1787 actually marking the variable as written. */
1788 if (flag_syntax_only)
1789 TREE_ASM_WRITTEN (vtbl) = 1;
1792 /* Since we're writing out the vtable here, also write the debug
1794 note_debug_info_needed (ctype);
1799 /* A special return value from type_visibility meaning internal
1802 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1804 /* walk_tree helper function for type_visibility. */
1807 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1809 int *vis_p = (int *)data;
1814 else if (CLASS_TYPE_P (*tp))
1816 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1818 *vis_p = VISIBILITY_ANON;
1821 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1822 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1827 /* Returns the visibility of TYPE, which is the minimum visibility of its
1831 type_visibility (tree type)
1833 int vis = VISIBILITY_DEFAULT;
1834 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1838 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1839 specified (or if VISIBILITY is static). */
1842 constrain_visibility (tree decl, int visibility)
1844 if (visibility == VISIBILITY_ANON)
1846 /* extern "C" declarations aren't affected by the anonymous
1848 if (!DECL_EXTERN_C_P (decl))
1850 TREE_PUBLIC (decl) = 0;
1851 DECL_ONE_ONLY (decl) = 0;
1852 DECL_INTERFACE_KNOWN (decl) = 1;
1853 if (DECL_LANG_SPECIFIC (decl))
1854 DECL_NOT_REALLY_EXTERN (decl) = 1;
1857 else if (visibility > DECL_VISIBILITY (decl)
1858 && !DECL_VISIBILITY_SPECIFIED (decl))
1860 DECL_VISIBILITY (decl) = visibility;
1866 /* Constrain the visibility of DECL based on the visibility of its template
1870 constrain_visibility_for_template (tree decl, tree targs)
1872 /* If this is a template instantiation, check the innermost
1873 template args for visibility constraints. The outer template
1874 args are covered by the class check. */
1875 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1877 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1881 tree arg = TREE_VEC_ELT (args, i-1);
1883 vis = type_visibility (arg);
1884 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1887 if (TREE_CODE (arg) == ADDR_EXPR)
1888 arg = TREE_OPERAND (arg, 0);
1889 if (TREE_CODE (arg) == VAR_DECL
1890 || TREE_CODE (arg) == FUNCTION_DECL)
1892 if (! TREE_PUBLIC (arg))
1893 vis = VISIBILITY_ANON;
1895 vis = DECL_VISIBILITY (arg);
1899 constrain_visibility (decl, vis);
1903 /* Like c_determine_visibility, but with additional C++-specific
1906 Function-scope entities can rely on the function's visibility because
1907 it is set in start_preparsed_function.
1909 Class-scope entities cannot rely on the class's visibility until the end
1910 of the enclosing class definition.
1912 Note that because namespaces have multiple independent definitions,
1913 namespace visibility is handled elsewhere using the #pragma visibility
1914 machinery rather than by decorating the namespace declaration.
1916 The goal is for constraints from the type to give a diagnostic, and
1917 other constraints to be applied silently. */
1920 determine_visibility (tree decl)
1922 tree class_type = NULL_TREE;
1925 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1927 /* Only relevant for names with external linkage. */
1928 if (!TREE_PUBLIC (decl))
1931 /* Cloned constructors and destructors get the same visibility as
1932 the underlying function. That should be set up in
1933 maybe_clone_body. */
1934 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1936 if (TREE_CODE (decl) == TYPE_DECL)
1938 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1939 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1940 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1945 else if (DECL_LANG_SPECIFIC (decl))
1946 use_template = DECL_USE_TEMPLATE (decl);
1950 /* If DECL is a member of a class, visibility specifiers on the
1951 class can influence the visibility of the DECL. */
1952 if (DECL_CLASS_SCOPE_P (decl))
1953 class_type = DECL_CONTEXT (decl);
1956 /* Not a class member. */
1958 /* Virtual tables have DECL_CONTEXT set to their associated class,
1959 so they are automatically handled above. */
1960 gcc_assert (TREE_CODE (decl) != VAR_DECL
1961 || !DECL_VTABLE_OR_VTT_P (decl));
1963 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1965 /* Local statics and classes get the visibility of their
1966 containing function by default, except that
1967 -fvisibility-inlines-hidden doesn't affect them. */
1968 tree fn = DECL_CONTEXT (decl);
1969 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1971 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1972 DECL_VISIBILITY_SPECIFIED (decl) =
1973 DECL_VISIBILITY_SPECIFIED (fn);
1976 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1978 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1979 but have no TEMPLATE_INFO, so don't try to check it. */
1982 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1983 && flag_visibility_ms_compat)
1985 /* Under -fvisibility-ms-compat, types are visible by default,
1986 even though their contents aren't. */
1987 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1988 int underlying_vis = type_visibility (underlying_type);
1989 if (underlying_vis == VISIBILITY_ANON
1990 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1991 constrain_visibility (decl, underlying_vis);
1993 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1995 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1997 /* tinfo visibility is based on the type it's for. */
1998 constrain_visibility
1999 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2001 /* Give the target a chance to override the visibility associated
2003 if (TREE_PUBLIC (decl)
2004 && !DECL_REALLY_EXTERN (decl)
2005 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2006 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2007 targetm.cxx.determine_class_data_visibility (decl);
2009 else if (use_template)
2010 /* Template instantiations and specializations get visibility based
2011 on their template unless they override it with an attribute. */;
2012 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2014 /* Set default visibility to whatever the user supplied with
2015 #pragma GCC visibility or a namespace visibility attribute. */
2016 DECL_VISIBILITY (decl) = default_visibility;
2017 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2023 /* If the specialization doesn't specify visibility, use the
2024 visibility from the template. */
2025 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2026 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2027 : DECL_TEMPLATE_INFO (decl));
2028 tree args = TI_ARGS (tinfo);
2030 if (args != error_mark_node)
2032 int depth = TMPL_ARGS_DEPTH (args);
2033 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2035 if (!DECL_VISIBILITY_SPECIFIED (decl))
2037 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2038 DECL_VISIBILITY_SPECIFIED (decl)
2039 = DECL_VISIBILITY_SPECIFIED (pattern);
2042 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2043 if (args && depth > template_class_depth (class_type))
2044 /* Limit visibility based on its template arguments. */
2045 constrain_visibility_for_template (decl, args);
2050 determine_visibility_from_class (decl, class_type);
2052 if (decl_anon_ns_mem_p (decl))
2053 /* Names in an anonymous namespace get internal linkage.
2054 This might change once we implement export. */
2055 constrain_visibility (decl, VISIBILITY_ANON);
2056 else if (TREE_CODE (decl) != TYPE_DECL)
2058 /* Propagate anonymity from type to decl. */
2059 int tvis = type_visibility (TREE_TYPE (decl));
2060 if (tvis == VISIBILITY_ANON
2061 || ! DECL_VISIBILITY_SPECIFIED (decl))
2062 constrain_visibility (decl, tvis);
2066 /* By default, static data members and function members receive
2067 the visibility of their containing class. */
2070 determine_visibility_from_class (tree decl, tree class_type)
2072 if (DECL_VISIBILITY_SPECIFIED (decl))
2075 if (visibility_options.inlines_hidden
2076 /* Don't do this for inline templates; specializations might not be
2077 inline, and we don't want them to inherit the hidden
2078 visibility. We'll set it here for all inline instantiations. */
2079 && !processing_template_decl
2080 && TREE_CODE (decl) == FUNCTION_DECL
2081 && DECL_DECLARED_INLINE_P (decl)
2082 && (! DECL_LANG_SPECIFIC (decl)
2083 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2084 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2087 /* Default to the class visibility. */
2088 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2089 DECL_VISIBILITY_SPECIFIED (decl)
2090 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2093 /* Give the target a chance to override the visibility associated
2095 if (TREE_CODE (decl) == VAR_DECL
2096 && (DECL_TINFO_P (decl)
2097 || (DECL_VTABLE_OR_VTT_P (decl)
2098 /* Construction virtual tables are not exported because
2099 they cannot be referred to from other object files;
2100 their name is not standardized by the ABI. */
2101 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2102 && TREE_PUBLIC (decl)
2103 && !DECL_REALLY_EXTERN (decl)
2104 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2105 targetm.cxx.determine_class_data_visibility (decl);
2108 /* Constrain the visibility of a class TYPE based on the visibility of its
2109 field types. Warn if any fields require lesser visibility. */
2112 constrain_class_visibility (tree type)
2118 int vis = type_visibility (type);
2120 if (vis == VISIBILITY_ANON
2121 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2124 /* Don't warn about visibility if the class has explicit visibility. */
2125 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2126 vis = VISIBILITY_INTERNAL;
2128 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2129 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2131 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2132 int subvis = type_visibility (ftype);
2134 if (subvis == VISIBILITY_ANON)
2136 if (!in_main_input_context ())
2138 %qT has a field %qD whose type uses the anonymous namespace",
2141 else if (MAYBE_CLASS_TYPE_P (ftype)
2142 && vis < VISIBILITY_HIDDEN
2143 && subvis >= VISIBILITY_HIDDEN)
2144 warning (OPT_Wattributes, "\
2145 %qT declared with greater visibility than the type of its field %qD",
2149 binfo = TYPE_BINFO (type);
2150 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2152 int subvis = type_visibility (TREE_TYPE (t));
2154 if (subvis == VISIBILITY_ANON)
2156 if (!in_main_input_context())
2158 %qT has a base %qT whose type uses the anonymous namespace",
2159 type, TREE_TYPE (t));
2161 else if (vis < VISIBILITY_HIDDEN
2162 && subvis >= VISIBILITY_HIDDEN)
2163 warning (OPT_Wattributes, "\
2164 %qT declared with greater visibility than its base %qT",
2165 type, TREE_TYPE (t));
2169 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2170 for DECL has not already been determined, do so now by setting
2171 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2172 function is called entities with vague linkage whose definitions
2173 are available must have TREE_PUBLIC set.
2175 If this function decides to place DECL in COMDAT, it will set
2176 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2177 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2178 callers defer that decision until it is clear that DECL is actually
2182 import_export_decl (tree decl)
2187 tree class_type = NULL_TREE;
2189 if (DECL_INTERFACE_KNOWN (decl))
2192 /* We cannot determine what linkage to give to an entity with vague
2193 linkage until the end of the file. For example, a virtual table
2194 for a class will be defined if and only if the key method is
2195 defined in this translation unit. As a further example, consider
2196 that when compiling a translation unit that uses PCH file with
2197 "-frepo" it would be incorrect to make decisions about what
2198 entities to emit when building the PCH; those decisions must be
2199 delayed until the repository information has been processed. */
2200 gcc_assert (at_eof);
2201 /* Object file linkage for explicit instantiations is handled in
2202 mark_decl_instantiated. For static variables in functions with
2203 vague linkage, maybe_commonize_var is used.
2205 Therefore, the only declarations that should be provided to this
2206 function are those with external linkage that are:
2208 * implicit instantiations of function templates
2212 * implicit instantiations of static data members of class
2219 Furthermore, all entities that reach this point must have a
2220 definition available in this translation unit.
2222 The following assertions check these conditions. */
2223 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2224 || TREE_CODE (decl) == VAR_DECL);
2225 /* Any code that creates entities with TREE_PUBLIC cleared should
2226 also set DECL_INTERFACE_KNOWN. */
2227 gcc_assert (TREE_PUBLIC (decl));
2228 if (TREE_CODE (decl) == FUNCTION_DECL)
2229 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2230 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2231 || DECL_DECLARED_INLINE_P (decl));
2233 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2234 || DECL_VTABLE_OR_VTT_P (decl)
2235 || DECL_TINFO_P (decl));
2236 /* Check that a definition of DECL is available in this translation
2238 gcc_assert (!DECL_REALLY_EXTERN (decl));
2240 /* Assume that DECL will not have COMDAT linkage. */
2242 /* Assume that DECL will not be imported into this translation
2246 /* See if the repository tells us whether or not to emit DECL in
2247 this translation unit. */
2248 emit_p = repo_emit_p (decl);
2251 else if (emit_p == 1)
2253 /* The repository indicates that this entity should be defined
2254 here. Make sure the back end honors that request. */
2255 if (TREE_CODE (decl) == VAR_DECL)
2257 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2258 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2261 FOR_EACH_CLONE (clone, decl)
2262 mark_needed (clone);
2266 /* Output the definition as an ordinary strong definition. */
2267 DECL_EXTERNAL (decl) = 0;
2268 DECL_INTERFACE_KNOWN (decl) = 1;
2273 /* We have already decided what to do with this DECL; there is no
2274 need to check anything further. */
2276 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2278 class_type = DECL_CONTEXT (decl);
2279 import_export_class (class_type);
2280 if (TYPE_FOR_JAVA (class_type))
2282 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2283 && CLASSTYPE_INTERFACE_ONLY (class_type))
2285 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2286 && !CLASSTYPE_USE_TEMPLATE (class_type)
2287 && CLASSTYPE_KEY_METHOD (class_type)
2288 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2289 /* The ABI requires that all virtual tables be emitted with
2290 COMDAT linkage. However, on systems where COMDAT symbols
2291 don't show up in the table of contents for a static
2292 archive, or on systems without weak symbols (where we
2293 approximate COMDAT linkage by using internal linkage), the
2294 linker will report errors about undefined symbols because
2295 it will not see the virtual table definition. Therefore,
2296 in the case that we know that the virtual table will be
2297 emitted in only one translation unit, we make the virtual
2298 table an ordinary definition with external linkage. */
2299 DECL_EXTERNAL (decl) = 0;
2300 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2302 /* CLASS_TYPE is being exported from this translation unit,
2303 so DECL should be defined here. */
2304 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2305 /* If a class is declared in a header with the "extern
2306 template" extension, then it will not be instantiated,
2307 even in translation units that would normally require
2308 it. Often such classes are explicitly instantiated in
2309 one translation unit. Therefore, the explicit
2310 instantiation must be made visible to other translation
2312 DECL_EXTERNAL (decl) = 0;
2315 /* The generic C++ ABI says that class data is always
2316 COMDAT, even if there is a key function. Some
2317 variants (e.g., the ARM EABI) says that class data
2318 only has COMDAT linkage if the class data might be
2319 emitted in more than one translation unit. When the
2320 key method can be inline and is inline, we still have
2321 to arrange for comdat even though
2322 class_data_always_comdat is false. */
2323 if (!CLASSTYPE_KEY_METHOD (class_type)
2324 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2325 || targetm.cxx.class_data_always_comdat ())
2327 /* The ABI requires COMDAT linkage. Normally, we
2328 only emit COMDAT things when they are needed;
2329 make sure that we realize that this entity is
2336 else if (!flag_implicit_templates
2337 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2342 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2344 tree type = TREE_TYPE (DECL_NAME (decl));
2345 if (CLASS_TYPE_P (type))
2348 import_export_class (type);
2349 if (CLASSTYPE_INTERFACE_KNOWN (type)
2350 && TYPE_POLYMORPHIC_P (type)
2351 && CLASSTYPE_INTERFACE_ONLY (type)
2352 /* If -fno-rtti was specified, then we cannot be sure
2353 that RTTI information will be emitted with the
2354 virtual table of the class, so we must emit it
2355 wherever it is used. */
2360 if (CLASSTYPE_INTERFACE_KNOWN (type)
2361 && !CLASSTYPE_INTERFACE_ONLY (type))
2363 comdat_p = (targetm.cxx.class_data_always_comdat ()
2364 || (CLASSTYPE_KEY_METHOD (type)
2365 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2370 DECL_EXTERNAL (decl) = 0;
2380 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2381 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2383 /* DECL is an implicit instantiation of a function or static
2385 if ((flag_implicit_templates
2386 && !flag_use_repository)
2387 || (flag_implicit_inline_templates
2388 && TREE_CODE (decl) == FUNCTION_DECL
2389 && DECL_DECLARED_INLINE_P (decl)))
2392 /* If we are not implicitly generating templates, then mark
2393 this entity as undefined in this translation unit. */
2396 else if (DECL_FUNCTION_MEMBER_P (decl))
2398 if (!DECL_DECLARED_INLINE_P (decl))
2400 tree ctype = DECL_CONTEXT (decl);
2401 import_export_class (ctype);
2402 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2404 DECL_NOT_REALLY_EXTERN (decl)
2405 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2406 || (DECL_DECLARED_INLINE_P (decl)
2407 && ! flag_implement_inlines
2408 && !DECL_VINDEX (decl)));
2410 if (!DECL_NOT_REALLY_EXTERN (decl))
2411 DECL_EXTERNAL (decl) = 1;
2413 /* Always make artificials weak. */
2414 if (DECL_ARTIFICIAL (decl) && flag_weak)
2417 maybe_make_one_only (decl);
2428 /* If we are importing DECL into this translation unit, mark is
2429 an undefined here. */
2430 DECL_EXTERNAL (decl) = 1;
2431 DECL_NOT_REALLY_EXTERN (decl) = 0;
2435 /* If we decided to put DECL in COMDAT, mark it accordingly at
2437 comdat_linkage (decl);
2440 DECL_INTERFACE_KNOWN (decl) = 1;
2443 /* Return an expression that performs the destruction of DECL, which
2444 must be a VAR_DECL whose type has a non-trivial destructor, or is
2445 an array whose (innermost) elements have a non-trivial destructor. */
2448 build_cleanup (tree decl)
2451 tree type = TREE_TYPE (decl);
2453 /* This function should only be called for declarations that really
2454 require cleanups. */
2455 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2457 /* Treat all objects with destructors as used; the destructor may do
2458 something substantive. */
2461 if (TREE_CODE (type) == ARRAY_TYPE)
2464 temp = build_address (decl);
2465 temp = build_delete (TREE_TYPE (temp), temp,
2466 sfk_complete_destructor,
2467 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2471 /* Returns the initialization guard variable for the variable DECL,
2472 which has static storage duration. */
2475 get_guard (tree decl)
2480 sname = mangle_guard_variable (decl);
2481 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2486 /* We use a type that is big enough to contain a mutex as well
2487 as an integer counter. */
2488 guard_type = targetm.cxx.guard_type ();
2489 guard = build_decl (VAR_DECL, sname, guard_type);
2491 /* The guard should have the same linkage as what it guards. */
2492 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2493 TREE_STATIC (guard) = TREE_STATIC (decl);
2494 DECL_COMMON (guard) = DECL_COMMON (decl);
2495 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2496 if (TREE_PUBLIC (decl))
2497 DECL_WEAK (guard) = DECL_WEAK (decl);
2498 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2499 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2501 DECL_ARTIFICIAL (guard) = 1;
2502 DECL_IGNORED_P (guard) = 1;
2503 TREE_USED (guard) = 1;
2504 pushdecl_top_level_and_finish (guard, NULL_TREE);
2509 /* Return those bits of the GUARD variable that should be set when the
2510 guarded entity is actually initialized. */
2513 get_guard_bits (tree guard)
2515 if (!targetm.cxx.guard_mask_bit ())
2517 /* We only set the first byte of the guard, in order to leave room
2518 for a mutex in the high-order bits. */
2519 guard = build1 (ADDR_EXPR,
2520 build_pointer_type (TREE_TYPE (guard)),
2522 guard = build1 (NOP_EXPR,
2523 build_pointer_type (char_type_node),
2525 guard = build1 (INDIRECT_REF, char_type_node, guard);
2531 /* Return an expression which determines whether or not the GUARD
2532 variable has already been initialized. */
2535 get_guard_cond (tree guard)
2539 /* Check to see if the GUARD is zero. */
2540 guard = get_guard_bits (guard);
2542 /* Mask off all but the low bit. */
2543 if (targetm.cxx.guard_mask_bit ())
2545 guard_value = integer_one_node;
2546 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2547 guard_value = convert (TREE_TYPE (guard), guard_value);
2548 guard = cp_build_binary_op (input_location,
2549 BIT_AND_EXPR, guard, guard_value,
2550 tf_warning_or_error);
2553 guard_value = integer_zero_node;
2554 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2555 guard_value = convert (TREE_TYPE (guard), guard_value);
2556 return cp_build_binary_op (input_location,
2557 EQ_EXPR, guard, guard_value,
2558 tf_warning_or_error);
2561 /* Return an expression which sets the GUARD variable, indicating that
2562 the variable being guarded has been initialized. */
2565 set_guard (tree guard)
2569 /* Set the GUARD to one. */
2570 guard = get_guard_bits (guard);
2571 guard_init = integer_one_node;
2572 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2573 guard_init = convert (TREE_TYPE (guard), guard_init);
2574 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2575 tf_warning_or_error);
2578 /* Start the process of running a particular set of global constructors
2579 or destructors. Subroutine of do_[cd]tors. */
2582 start_objects (int method_type, int initp)
2588 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2590 if (initp != DEFAULT_INIT_PRIORITY)
2600 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2603 sprintf (type, "%c", method_type);
2605 fndecl = build_lang_decl (FUNCTION_DECL,
2606 get_file_function_name (type),
2607 build_function_type (void_type_node,
2609 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2611 TREE_PUBLIC (current_function_decl) = 0;
2613 /* Mark as artificial because it's not explicitly in the user's
2615 DECL_ARTIFICIAL (current_function_decl) = 1;
2617 /* Mark this declaration as used to avoid spurious warnings. */
2618 TREE_USED (current_function_decl) = 1;
2620 /* Mark this function as a global constructor or destructor. */
2621 if (method_type == 'I')
2622 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2624 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2625 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2627 body = begin_compound_stmt (BCS_FN_BODY);
2632 /* Finish the process of running a particular set of global constructors
2633 or destructors. Subroutine of do_[cd]tors. */
2636 finish_objects (int method_type, int initp, tree body)
2641 finish_compound_stmt (body);
2642 fn = finish_function (0);
2644 if (method_type == 'I')
2646 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2647 decl_init_priority_insert (fn, initp);
2651 DECL_STATIC_DESTRUCTOR (fn) = 1;
2652 decl_fini_priority_insert (fn, initp);
2655 expand_or_defer_fn (fn);
2658 /* The names of the parameters to the function created to handle
2659 initializations and destructions for objects with static storage
2661 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2662 #define PRIORITY_IDENTIFIER "__priority"
2664 /* The name of the function we create to handle initializations and
2665 destructions for objects with static storage duration. */
2666 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2668 /* The declaration for the __INITIALIZE_P argument. */
2669 static GTY(()) tree initialize_p_decl;
2671 /* The declaration for the __PRIORITY argument. */
2672 static GTY(()) tree priority_decl;
2674 /* The declaration for the static storage duration function. */
2675 static GTY(()) tree ssdf_decl;
2677 /* All the static storage duration functions created in this
2678 translation unit. */
2679 static GTY(()) VEC(tree,gc) *ssdf_decls;
2681 /* A map from priority levels to information about that priority
2682 level. There may be many such levels, so efficient lookup is
2684 static splay_tree priority_info_map;
2686 /* Begins the generation of the function that will handle all
2687 initialization and destruction of objects with static storage
2688 duration. The function generated takes two parameters of type
2689 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2690 nonzero, it performs initializations. Otherwise, it performs
2691 destructions. It only performs those initializations or
2692 destructions with the indicated __PRIORITY. The generated function
2695 It is assumed that this function will only be called once per
2696 translation unit. */
2699 start_static_storage_duration_function (unsigned count)
2704 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2706 /* Create the identifier for this function. It will be of the form
2707 SSDF_IDENTIFIER_<number>. */
2708 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2710 /* Create the parameters. */
2711 parm_types = void_list_node;
2712 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2713 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2714 type = build_function_type (void_type_node, parm_types);
2716 /* Create the FUNCTION_DECL itself. */
2717 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2718 get_identifier (id),
2720 TREE_PUBLIC (ssdf_decl) = 0;
2721 DECL_ARTIFICIAL (ssdf_decl) = 1;
2723 /* Put this function in the list of functions to be called from the
2724 static constructors and destructors. */
2727 ssdf_decls = VEC_alloc (tree, gc, 32);
2729 /* Take this opportunity to initialize the map from priority
2730 numbers to information about that priority level. */
2731 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2732 /*delete_key_fn=*/0,
2733 /*delete_value_fn=*/
2734 (splay_tree_delete_value_fn) &free);
2736 /* We always need to generate functions for the
2737 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2738 priorities later, we'll be sure to find the
2739 DEFAULT_INIT_PRIORITY. */
2740 get_priority_info (DEFAULT_INIT_PRIORITY);
2743 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2745 /* Create the argument list. */
2746 initialize_p_decl = cp_build_parm_decl
2747 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2748 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2749 TREE_USED (initialize_p_decl) = 1;
2750 priority_decl = cp_build_parm_decl
2751 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2752 DECL_CONTEXT (priority_decl) = ssdf_decl;
2753 TREE_USED (priority_decl) = 1;
2755 TREE_CHAIN (initialize_p_decl) = priority_decl;
2756 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2758 /* Put the function in the global scope. */
2759 pushdecl (ssdf_decl);
2761 /* Start the function itself. This is equivalent to declaring the
2764 static void __ssdf (int __initialize_p, init __priority_p);
2766 It is static because we only need to call this function from the
2767 various constructor and destructor functions for this module. */
2768 start_preparsed_function (ssdf_decl,
2769 /*attrs=*/NULL_TREE,
2772 /* Set up the scope of the outermost block in the function. */
2773 body = begin_compound_stmt (BCS_FN_BODY);
2778 /* Finish the generation of the function which performs initialization
2779 and destruction of objects with static storage duration. After
2780 this point, no more such objects can be created. */
2783 finish_static_storage_duration_function (tree body)
2785 /* Close out the function. */
2786 finish_compound_stmt (body);
2787 expand_or_defer_fn (finish_function (0));
2790 /* Return the information about the indicated PRIORITY level. If no
2791 code to handle this level has yet been generated, generate the
2792 appropriate prologue. */
2794 static priority_info
2795 get_priority_info (int priority)
2800 n = splay_tree_lookup (priority_info_map,
2801 (splay_tree_key) priority);
2804 /* Create a new priority information structure, and insert it
2806 pi = XNEW (struct priority_info_s);
2807 pi->initializations_p = 0;
2808 pi->destructions_p = 0;
2809 splay_tree_insert (priority_info_map,
2810 (splay_tree_key) priority,
2811 (splay_tree_value) pi);
2814 pi = (priority_info) n->value;
2819 /* The effective initialization priority of a DECL. */
2821 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2822 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2823 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2825 /* Whether a DECL needs a guard to protect it against multiple
2828 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2829 || DECL_ONE_ONLY (decl) \
2830 || DECL_WEAK (decl)))
2832 /* Called from one_static_initialization_or_destruction(),
2834 Walks the initializer list of a global variable and looks for
2835 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2836 and that have their DECL_CONTEXT() == NULL.
2837 For each such temporary variable, set their DECL_CONTEXT() to
2838 the current function. This is necessary because otherwise
2839 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2840 when trying to refer to a temporary variable that does not have
2841 it's DECL_CONTECT() properly set. */
2843 fix_temporary_vars_context_r (tree *node,
2844 int *unused ATTRIBUTE_UNUSED,
2845 void *unused1 ATTRIBUTE_UNUSED)
2847 gcc_assert (current_function_decl);
2849 if (TREE_CODE (*node) == BIND_EXPR)
2853 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2854 if (TREE_CODE (var) == VAR_DECL
2856 && DECL_ARTIFICIAL (var)
2857 && !DECL_CONTEXT (var))
2858 DECL_CONTEXT (var) = current_function_decl;
2864 /* Set up to handle the initialization or destruction of DECL. If
2865 INITP is nonzero, we are initializing the variable. Otherwise, we
2866 are destroying it. */
2869 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2871 tree guard_if_stmt = NULL_TREE;
2874 /* If we are supposed to destruct and there's a trivial destructor,
2875 nothing has to be done. */
2877 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2880 /* Trick the compiler into thinking we are at the file and line
2881 where DECL was declared so that error-messages make sense, and so
2882 that the debugger will show somewhat sensible file and line
2884 input_location = DECL_SOURCE_LOCATION (decl);
2886 /* Make sure temporary variables in the initialiser all have
2887 their DECL_CONTEXT() set to a value different from NULL_TREE.
2888 This can happen when global variables initialisers are built.
2889 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2890 the temporary variables that might have been generated in the
2891 accompagning initialisers is NULL_TREE, meaning the variables have been
2892 declared in the global namespace.
2893 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2894 of the temporaries are set to the current function decl. */
2895 cp_walk_tree_without_duplicates (&init,
2896 fix_temporary_vars_context_r,
2903 Access control for implicit calls to the constructors,
2904 the conversion functions, or the destructor called to
2905 create and destroy a static data member is performed as
2906 if these calls appeared in the scope of the member's
2909 we pretend we are in a static member function of the class of
2910 which the DECL is a member. */
2911 if (member_p (decl))
2913 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2914 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2917 /* Assume we don't need a guard. */
2919 /* We need a guard if this is an object with external linkage that
2920 might be initialized in more than one place. (For example, a
2921 static data member of a template, when the data member requires
2923 if (NEEDS_GUARD_P (decl))
2927 guard = get_guard (decl);
2929 /* When using __cxa_atexit, we just check the GUARD as we would
2930 for a local static. */
2931 if (flag_use_cxa_atexit)
2933 /* When using __cxa_atexit, we never try to destroy
2934 anything from a static destructor. */
2936 guard_cond = get_guard_cond (guard);
2938 /* If we don't have __cxa_atexit, then we will be running
2939 destructors from .fini sections, or their equivalents. So,
2940 we need to know how many times we've tried to initialize this
2941 object. We do initializations only if the GUARD is zero,
2942 i.e., if we are the first to initialize the variable. We do
2943 destructions only if the GUARD is one, i.e., if we are the
2944 last to destroy the variable. */
2947 = cp_build_binary_op (input_location,
2949 cp_build_unary_op (PREINCREMENT_EXPR,
2952 tf_warning_or_error),
2954 tf_warning_or_error);
2957 = cp_build_binary_op (input_location,
2959 cp_build_unary_op (PREDECREMENT_EXPR,
2962 tf_warning_or_error),
2964 tf_warning_or_error);
2966 guard_if_stmt = begin_if_stmt ();
2967 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2971 /* If we're using __cxa_atexit, we have not already set the GUARD,
2972 so we must do so now. */
2973 if (guard && initp && flag_use_cxa_atexit)
2974 finish_expr_stmt (set_guard (guard));
2976 /* Perform the initialization or destruction. */
2980 finish_expr_stmt (init);
2982 /* If we're using __cxa_atexit, register a function that calls the
2983 destructor for the object. */
2984 if (flag_use_cxa_atexit)
2985 finish_expr_stmt (register_dtor_fn (decl));
2988 finish_expr_stmt (build_cleanup (decl));
2990 /* Finish the guard if-stmt, if necessary. */
2993 finish_then_clause (guard_if_stmt);
2994 finish_if_stmt (guard_if_stmt);
2997 /* Now that we're done with DECL we don't need to pretend to be a
2998 member of its class any longer. */
2999 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3000 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3003 /* Generate code to do the initialization or destruction of the decls in VARS,
3004 a TREE_LIST of VAR_DECL with static storage duration.
3005 Whether initialization or destruction is performed is specified by INITP. */
3008 do_static_initialization_or_destruction (tree vars, bool initp)
3010 tree node, init_if_stmt, cond;
3012 /* Build the outer if-stmt to check for initialization or destruction. */
3013 init_if_stmt = begin_if_stmt ();
3014 cond = initp ? integer_one_node : integer_zero_node;
3015 cond = cp_build_binary_op (input_location,
3019 tf_warning_or_error);
3020 finish_if_stmt_cond (cond, init_if_stmt);
3024 tree decl = TREE_VALUE (node);
3025 tree priority_if_stmt;
3029 /* If we don't need a destructor, there's nothing to do. Avoid
3030 creating a possibly empty if-stmt. */
3031 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3033 node = TREE_CHAIN (node);
3037 /* Remember that we had an initialization or finalization at this
3039 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3040 pi = get_priority_info (priority);
3042 pi->initializations_p = 1;
3044 pi->destructions_p = 1;
3046 /* Conditionalize this initialization on being in the right priority
3047 and being initializing/finalizing appropriately. */
3048 priority_if_stmt = begin_if_stmt ();
3049 cond = cp_build_binary_op (input_location,
3052 build_int_cst (NULL_TREE, priority),
3053 tf_warning_or_error);
3054 finish_if_stmt_cond (cond, priority_if_stmt);
3056 /* Process initializers with same priority. */
3058 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3059 node = TREE_CHAIN (node))
3060 /* Do one initialization or destruction. */
3061 one_static_initialization_or_destruction (TREE_VALUE (node),
3062 TREE_PURPOSE (node), initp);
3064 /* Finish up the priority if-stmt body. */
3065 finish_then_clause (priority_if_stmt);
3066 finish_if_stmt (priority_if_stmt);
3070 /* Finish up the init/destruct if-stmt body. */
3071 finish_then_clause (init_if_stmt);
3072 finish_if_stmt (init_if_stmt);
3075 /* VARS is a list of variables with static storage duration which may
3076 need initialization and/or finalization. Remove those variables
3077 that don't really need to be initialized or finalized, and return
3078 the resulting list. The order in which the variables appear in
3079 VARS is in reverse order of the order in which they should actually
3080 be initialized. The list we return is in the unreversed order;
3081 i.e., the first variable should be initialized first. */
3084 prune_vars_needing_no_initialization (tree *vars)
3087 tree result = NULL_TREE;
3092 tree decl = TREE_VALUE (t);
3093 tree init = TREE_PURPOSE (t);
3095 /* Deal gracefully with error. */
3096 if (decl == error_mark_node)
3098 var = &TREE_CHAIN (t);
3102 /* The only things that can be initialized are variables. */
3103 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3105 /* If this object is not defined, we don't need to do anything
3107 if (DECL_EXTERNAL (decl))
3109 var = &TREE_CHAIN (t);
3113 /* Also, if the initializer already contains errors, we can bail
3115 if (init && TREE_CODE (init) == TREE_LIST
3116 && value_member (error_mark_node, init))
3118 var = &TREE_CHAIN (t);
3122 /* This variable is going to need initialization and/or
3123 finalization, so we add it to the list. */
3124 *var = TREE_CHAIN (t);
3125 TREE_CHAIN (t) = result;
3132 /* Make sure we have told the back end about all the variables in
3136 write_out_vars (tree vars)
3140 for (v = vars; v; v = TREE_CHAIN (v))
3142 tree var = TREE_VALUE (v);
3143 if (!var_finalized_p (var))
3145 import_export_decl (var);
3146 rest_of_decl_compilation (var, 1, 1);
3151 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3152 (otherwise) that will initialize all global objects with static
3153 storage duration having the indicated PRIORITY. */
3156 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3165 input_location = *locus;
3167 /* Was: locus->line++; */
3169 /* We use `I' to indicate initialization and `D' to indicate
3171 function_key = constructor_p ? 'I' : 'D';
3173 /* We emit the function lazily, to avoid generating empty
3174 global constructors and destructors. */
3177 /* For Objective-C++, we may need to initialize metadata found in this module.
3178 This must be done _before_ any other static initializations. */
3179 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3180 && constructor_p && objc_static_init_needed_p ())
3182 body = start_objects (function_key, priority);
3183 objc_generate_static_init_call (NULL_TREE);
3186 /* Call the static storage duration function with appropriate
3188 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3190 /* Calls to pure or const functions will expand to nothing. */
3191 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3194 body = start_objects (function_key, priority);
3196 arguments = tree_cons (NULL_TREE,
3197 build_int_cst (NULL_TREE, priority),
3199 arguments = tree_cons (NULL_TREE,
3200 build_int_cst (NULL_TREE, constructor_p),
3202 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3203 tf_warning_or_error));
3207 /* Close out the function. */
3209 finish_objects (function_key, priority, body);
3212 /* Generate constructor and destructor functions for the priority
3216 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3218 location_t *locus = (location_t *) data;
3219 int priority = (int) n->key;
3220 priority_info pi = (priority_info) n->value;
3222 /* Generate the functions themselves, but only if they are really
3224 if (pi->initializations_p)
3225 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3226 if (pi->destructions_p)
3227 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3229 /* Keep iterating. */
3233 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3234 decls referenced from front-end specific constructs; it will be called
3235 only for language-specific tree nodes.
3237 Here we must deal with member pointers. */
3240 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3244 switch (TREE_CODE (t))
3247 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3248 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3251 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3252 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3255 if (DECL_VTABLE_OR_VTT_P (t))
3257 /* The ABI requires that all virtual tables be emitted
3258 whenever one of them is. */
3260 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3262 vtbl = TREE_CHAIN (vtbl))
3263 mark_decl_referenced (vtbl);
3265 else if (DECL_CONTEXT (t)
3266 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3267 /* If we need a static variable in a function, then we
3268 need the containing function. */
3269 mark_decl_referenced (DECL_CONTEXT (t));
3278 /* Java requires that we be able to reference a local address for a
3279 method, and not be confused by PLT entries. If hidden aliases are
3280 supported, emit one for each java function that we've emitted. */
3283 build_java_method_aliases (void)
3285 struct cgraph_node *node;
3287 #ifndef HAVE_GAS_HIDDEN
3291 for (node = cgraph_nodes; node ; node = node->next)
3293 tree fndecl = node->decl;
3295 if (TREE_ASM_WRITTEN (fndecl)
3296 && DECL_CONTEXT (fndecl)
3297 && TYPE_P (DECL_CONTEXT (fndecl))
3298 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3299 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3301 /* Mangle the name in a predictable way; we need to reference
3302 this from a java compiled object file. */
3303 tree oid, nid, alias;
3307 oid = DECL_ASSEMBLER_NAME (fndecl);
3308 oname = IDENTIFIER_POINTER (oid);
3309 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3310 nname = ACONCAT (("_ZGA", oname+2, NULL));
3311 nid = get_identifier (nname);
3313 alias = make_alias_for (fndecl, nid);
3314 TREE_PUBLIC (alias) = 1;
3315 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3317 assemble_alias (alias, oid);
3322 /* This routine is called at the end of compilation.
3323 Its job is to create all the code needed to initialize and
3324 destroy the global aggregates. We do the destruction
3325 first, since that way we only need to reverse the decls once. */
3328 cp_write_global_declarations (void)
3334 unsigned ssdf_count = 0;
3338 locus = input_location;
3341 /* Bad parse errors. Just forget about it. */
3342 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3346 c_common_write_pch ();
3348 /* FIXME - huh? was input_line -= 1;*/
3350 /* We now have to write out all the stuff we put off writing out.
3353 o Template specializations that we have not yet instantiated,
3354 but which are needed.
3355 o Initialization and destruction for non-local objects with
3356 static storage duration. (Local objects with static storage
3357 duration are initialized when their scope is first entered,
3358 and are cleaned up via atexit.)
3359 o Virtual function tables.
3361 All of these may cause others to be needed. For example,
3362 instantiating one function may cause another to be needed, and
3363 generating the initializer for an object may cause templates to be
3364 instantiated, etc., etc. */
3366 timevar_push (TV_VARCONST);
3368 emit_support_tinfos ();
3377 /* If there are templates that we've put off instantiating, do
3379 instantiate_pending_templates (retries);
3382 /* Write out virtual tables as required. Note that writing out
3383 the virtual table for a template class may cause the
3384 instantiation of members of that class. If we write out
3385 vtables then we remove the class from our list so we don't
3386 have to look at it again. */
3388 while (keyed_classes != NULL_TREE
3389 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3392 keyed_classes = TREE_CHAIN (keyed_classes);
3398 tree next = TREE_CHAIN (t);
3402 if (maybe_emit_vtables (TREE_VALUE (next)))
3405 TREE_CHAIN (t) = TREE_CHAIN (next);
3410 next = TREE_CHAIN (t);
3414 /* Write out needed type info variables. We have to be careful
3415 looping through unemitted decls, because emit_tinfo_decl may
3416 cause other variables to be needed. New elements will be
3417 appended, and we remove from the vector those that actually
3419 for (i = VEC_length (tree, unemitted_tinfo_decls);
3420 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3421 if (emit_tinfo_decl (t))
3424 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3427 /* The list of objects with static storage duration is built up
3428 in reverse order. We clear STATIC_AGGREGATES so that any new
3429 aggregates added during the initialization of these will be
3430 initialized in the correct order when we next come around the
3432 vars = prune_vars_needing_no_initialization (&static_aggregates);
3436 /* We need to start a new initialization function each time
3437 through the loop. That's because we need to know which
3438 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3439 isn't computed until a function is finished, and written
3440 out. That's a deficiency in the back end. When this is
3441 fixed, these initialization functions could all become
3442 inline, with resulting performance improvements. */
3445 /* Set the line and file, so that it is obviously not from
3447 input_location = locus;
3448 ssdf_body = start_static_storage_duration_function (ssdf_count);
3450 /* Make sure the back end knows about all the variables. */
3451 write_out_vars (vars);
3453 /* First generate code to do all the initializations. */
3455 do_static_initialization_or_destruction (vars, /*initp=*/true);
3457 /* Then, generate code to do all the destructions. Do these
3458 in reverse order so that the most recently constructed
3459 variable is the first destroyed. If we're using
3460 __cxa_atexit, then we don't need to do this; functions
3461 were registered at initialization time to destroy the
3463 if (!flag_use_cxa_atexit && vars)
3465 vars = nreverse (vars);
3466 do_static_initialization_or_destruction (vars, /*initp=*/false);
3471 /* Finish up the static storage duration function for this
3473 input_location = locus;
3474 finish_static_storage_duration_function (ssdf_body);
3476 /* All those initializations and finalizations might cause
3477 us to need more inline functions, more template
3478 instantiations, etc. */
3481 /* ??? was: locus.line++; */
3484 /* Go through the set of inline functions whose bodies have not
3485 been emitted yet. If out-of-line copies of these functions
3486 are required, emit them. */
3487 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3489 /* Does it need synthesizing? */
3490 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3491 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3493 /* Even though we're already at the top-level, we push
3494 there again. That way, when we pop back a few lines
3495 hence, all of our state is restored. Otherwise,
3496 finish_function doesn't clean things up, and we end
3497 up with CURRENT_FUNCTION_DECL set. */
3498 push_to_top_level ();
3499 /* The decl's location will mark where it was first
3500 needed. Save that so synthesize method can indicate
3501 where it was needed from, in case of error */
3502 input_location = DECL_SOURCE_LOCATION (decl);
3503 synthesize_method (decl);
3504 pop_from_top_level ();
3508 if (!gimple_body (decl))
3511 /* We lie to the back end, pretending that some functions
3512 are not defined when they really are. This keeps these
3513 functions from being put out unnecessarily. But, we must
3514 stop lying when the functions are referenced, or if they
3515 are not comdat since they need to be put out now. If
3516 DECL_INTERFACE_KNOWN, then we have already set
3517 DECL_EXTERNAL appropriately, so there's no need to check
3518 again, and we do not want to clear DECL_EXTERNAL if a
3519 previous call to import_export_decl set it.
3521 This is done in a separate for cycle, because if some
3522 deferred function is contained in another deferred
3523 function later in deferred_fns varray,
3524 rest_of_compilation would skip this function and we
3525 really cannot expand the same function twice. */
3526 import_export_decl (decl);
3527 if (DECL_NOT_REALLY_EXTERN (decl)
3528 && DECL_INITIAL (decl)
3529 && decl_needed_p (decl))
3530 DECL_EXTERNAL (decl) = 0;
3532 /* If we're going to need to write this function out, and
3533 there's already a body for it, create RTL for it now.
3534 (There might be no body if this is a method we haven't
3535 gotten around to synthesizing yet.) */
3536 if (!DECL_EXTERNAL (decl)
3537 && decl_needed_p (decl)
3538 && !TREE_ASM_WRITTEN (decl)
3539 && !cgraph_node (decl)->local.finalized)
3541 /* We will output the function; no longer consider it in this
3543 DECL_DEFER_OUTPUT (decl) = 0;
3544 /* Generate RTL for this function now that we know we
3546 expand_or_defer_fn (decl);
3547 /* If we're compiling -fsyntax-only pretend that this
3548 function has been written out so that we don't try to
3550 if (flag_syntax_only)
3551 TREE_ASM_WRITTEN (decl) = 1;
3556 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3559 /* Static data members are just like namespace-scope globals. */
3560 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3562 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3563 /* Don't write it out if we haven't seen a definition. */
3564 || DECL_IN_AGGR_P (decl))
3566 import_export_decl (decl);
3567 /* If this static data member is needed, provide it to the
3569 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3570 DECL_EXTERNAL (decl) = 0;
3572 if (VEC_length (tree, pending_statics) != 0
3573 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3574 VEC_length (tree, pending_statics)))
3581 /* All used inline functions must have a definition at this point. */
3582 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3584 if (/* Check online inline functions that were actually used. */
3585 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3586 /* If the definition actually was available here, then the
3587 fact that the function was not defined merely represents
3588 that for some reason (use of a template repository,
3589 #pragma interface, etc.) we decided not to emit the
3591 && !DECL_INITIAL (decl)
3592 /* An explicit instantiation can be used to specify
3593 that the body is in another unit. It will have
3594 already verified there was a definition. */
3595 && !DECL_EXPLICIT_INSTANTIATION (decl))
3597 warning (0, "inline function %q+D used but never defined", decl);
3598 /* Avoid a duplicate warning from check_global_declaration_1. */
3599 TREE_NO_WARNING (decl) = 1;
3603 /* We give C linkage to static constructors and destructors. */
3604 push_lang_context (lang_name_c);
3606 /* Generate initialization and destruction functions for all
3607 priorities for which they are required. */
3608 if (priority_info_map)
3609 splay_tree_foreach (priority_info_map,
3610 generate_ctor_and_dtor_functions_for_priority,
3612 else if (c_dialect_objc () && objc_static_init_needed_p ())
3613 /* If this is obj-c++ and we need a static init, call
3614 generate_ctor_or_dtor_function. */
3615 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3616 DEFAULT_INIT_PRIORITY, &locus);
3618 /* We're done with the splay-tree now. */
3619 if (priority_info_map)
3620 splay_tree_delete (priority_info_map);
3622 /* Generate any missing aliases. */
3623 maybe_apply_pending_pragma_weaks ();
3625 /* We're done with static constructors, so we can go back to "C++"
3627 pop_lang_context ();
3629 cgraph_finalize_compilation_unit ();
3632 /* Now, issue warnings about static, but not defined, functions,
3633 etc., and emit debugging information. */
3634 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3635 if (VEC_length (tree, pending_statics) != 0)
3637 check_global_declarations (VEC_address (tree, pending_statics),
3638 VEC_length (tree, pending_statics));
3639 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3640 VEC_length (tree, pending_statics));
3643 /* Generate hidden aliases for Java. */
3644 build_java_method_aliases ();
3648 /* The entire file is now complete. If requested, dump everything
3652 FILE *stream = dump_begin (TDI_tu, &flags);
3656 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3657 dump_end (TDI_tu, stream);
3661 timevar_pop (TV_VARCONST);
3663 if (flag_detailed_statistics)
3665 dump_tree_statistics ();
3666 dump_time_statistics ();
3668 input_location = locus;
3670 #ifdef ENABLE_CHECKING
3671 validate_conversion_obstack ();
3672 #endif /* ENABLE_CHECKING */
3675 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3676 function to call in parse-tree form; it has not yet been
3677 semantically analyzed. ARGS are the arguments to the function.
3678 They have already been semantically analyzed. */
3681 build_offset_ref_call_from_tree (tree fn, tree args)
3690 object = TREE_OPERAND (fn, 0);
3692 if (processing_template_decl)
3694 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3695 || TREE_CODE (fn) == MEMBER_REF);
3696 if (type_dependent_expression_p (fn)
3697 || any_type_dependent_arguments_p (args))
3698 return build_nt_call_list (fn, args);
3700 /* Transform the arguments and add the implicit "this"
3701 parameter. That must be done before the FN is transformed
3702 because we depend on the form of FN. */
3703 args = build_non_dependent_args (args);
3704 object = build_non_dependent_expr (object);
3705 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3706 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3707 args = tree_cons (NULL_TREE, object, args);
3708 /* Now that the arguments are done, transform FN. */
3709 fn = build_non_dependent_expr (fn);
3712 /* A qualified name corresponding to a bound pointer-to-member is
3713 represented as an OFFSET_REF:
3715 struct B { void g(); };
3717 void B::g() { (this->*p)(); } */
3718 if (TREE_CODE (fn) == OFFSET_REF)
3720 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3721 tf_warning_or_error);
3722 fn = TREE_OPERAND (fn, 1);
3723 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3724 args = tree_cons (NULL_TREE, object_addr, args);
3727 expr = cp_build_function_call (fn, args, tf_warning_or_error);
3728 if (processing_template_decl && expr != error_mark_node)
3729 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3735 check_default_args (tree x)
3737 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3738 bool saw_def = false;
3739 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3740 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3742 if (TREE_PURPOSE (arg))
3746 error ("default argument missing for parameter %P of %q+#D", i, x);
3747 TREE_PURPOSE (arg) = error_mark_node;
3752 /* Return true if function DECL can be inlined. This is used to force
3753 instantiation of methods that might be interesting for inlining. */
3755 possibly_inlined_p (tree decl)
3757 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3758 if (DECL_UNINLINABLE (decl))
3761 return DECL_DECLARED_INLINE_P (decl);
3762 /* When optimizing, we might inline everything when flatten
3763 attribute or heuristics inlining for size or autoinlining
3768 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3769 If DECL is a specialization or implicitly declared class member,
3770 generate the actual definition. */
3773 mark_used (tree decl)
3775 HOST_WIDE_INT saved_processing_template_decl = 0;
3777 /* If DECL is a BASELINK for a single function, then treat it just
3778 like the DECL for the function. Otherwise, if the BASELINK is
3779 for an overloaded function, we don't know which function was
3780 actually used until after overload resolution. */
3781 if (TREE_CODE (decl) == BASELINK)
3783 decl = BASELINK_FUNCTIONS (decl);
3784 if (really_overloaded_fn (decl))
3786 decl = OVL_CURRENT (decl);
3789 TREE_USED (decl) = 1;
3790 if (DECL_CLONED_FUNCTION_P (decl))
3791 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3792 if (TREE_CODE (decl) == FUNCTION_DECL
3793 && DECL_DELETED_FN (decl))
3795 error ("deleted function %q+D", decl);
3796 error ("used here");
3798 /* If we don't need a value, then we don't need to synthesize DECL. */
3799 if (skip_evaluation)
3802 /* If within finish_function, defer the rest until that function
3803 finishes, otherwise it might recurse. */
3804 if (defer_mark_used_calls)
3806 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
3810 /* Normally, we can wait until instantiation-time to synthesize
3811 DECL. However, if DECL is a static data member initialized with
3812 a constant, we need the value right now because a reference to
3813 such a data member is not value-dependent. */
3814 if (TREE_CODE (decl) == VAR_DECL
3815 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3816 && DECL_CLASS_SCOPE_P (decl))
3818 /* Don't try to instantiate members of dependent types. We
3819 cannot just use dependent_type_p here because this function
3820 may be called from fold_non_dependent_expr, and then we may
3821 see dependent types, even though processing_template_decl
3823 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3824 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3826 /* Pretend that we are not in a template, even if we are, so
3827 that the static data member initializer will be processed. */
3828 saved_processing_template_decl = processing_template_decl;
3829 processing_template_decl = 0;
3832 if (processing_template_decl)
3835 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3836 && !TREE_ASM_WRITTEN (decl))
3837 /* Remember it, so we can check it was defined. */
3839 if (DECL_DEFERRED_FN (decl))
3842 /* Remember the current location for a function we will end up
3843 synthesizing. Then we can inform the user where it was
3844 required in the case of error. */
3845 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3846 && !DECL_THUNK_P (decl))
3847 DECL_SOURCE_LOCATION (decl) = input_location;
3849 note_vague_linkage_fn (decl);
3852 /* Is it a synthesized method that needs to be synthesized? */
3853 if (TREE_CODE (decl) == FUNCTION_DECL
3854 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3855 && DECL_DEFAULTED_FN (decl)
3856 && !DECL_THUNK_P (decl)
3857 && ! DECL_INITIAL (decl)
3858 /* Kludge: don't synthesize for default args. Unfortunately this
3859 rules out initializers of namespace-scoped objects too, but
3860 it's sort-of ok if the implicit ctor or dtor decl keeps
3861 pointing to the class location. */
3862 && current_function_decl)
3864 synthesize_method (decl);
3865 /* If we've already synthesized the method we don't need to
3866 do the instantiation test below. */
3868 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3869 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3870 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3871 || (TREE_CODE (decl) == FUNCTION_DECL
3872 && possibly_inlined_p
3873 (DECL_TEMPLATE_RESULT (
3874 template_for_substitution (decl))))
3875 /* We need to instantiate static data members so that there
3876 initializers are available in integral constant
3878 || (TREE_CODE (decl) == VAR_DECL
3879 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3880 /* If this is a function or variable that is an instance of some
3881 template, we now know that we will need to actually do the
3882 instantiation. We check that DECL is not an explicit
3883 instantiation because that is not checked in instantiate_decl.
3885 We put off instantiating functions in order to improve compile
3886 times. Maintaining a stack of active functions is expensive,
3887 and the inliner knows to instantiate any functions it might
3888 need. Therefore, we always try to defer instantiation. */
3889 instantiate_decl (decl, /*defer_ok=*/true,
3890 /*expl_inst_class_mem_p=*/false);
3892 processing_template_decl = saved_processing_template_decl;
3895 #include "gt-cp-decl2.h"