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 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
55 extern cpp_reader *parse_in;
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
59 typedef struct priority_info_s {
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
62 int initializations_p;
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
68 static void mark_vtable_entries (tree);
69 static bool maybe_emit_vtables (tree);
70 static bool acceptable_java_type (tree);
71 static tree start_objects (int, int);
72 static void finish_objects (int, int, tree);
73 static tree start_static_storage_duration_function (unsigned);
74 static void finish_static_storage_duration_function (tree);
75 static priority_info get_priority_info (int);
76 static void do_static_initialization_or_destruction (tree, bool);
77 static void one_static_initialization_or_destruction (tree, tree, bool);
78 static void generate_ctor_or_dtor_function (bool, int, location_t *);
79 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
81 static tree prune_vars_needing_no_initialization (tree *);
82 static void write_out_vars (tree);
83 static void import_export_class (tree);
84 static tree get_guard_bits (tree);
85 static void determine_visibility_from_class (tree, tree);
87 /* A list of static class variables. This is needed, because a
88 static class variable can be declared inside the class without
89 an initializer, and then initialized, statically, outside the class. */
90 static GTY(()) VEC(tree,gc) *pending_statics;
92 /* A list of functions which were declared inline, but which we
93 may need to emit outline anyway. */
94 static GTY(()) VEC(tree,gc) *deferred_fns;
96 /* Nonzero if we're done parsing and into end-of-file activities. */
100 /* Functions called along with real static constructors and destructors. */
107 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
108 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
109 that apply to the function). */
112 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
117 if (fntype == error_mark_node || ctype == error_mark_node)
118 return error_mark_node;
120 type_quals = quals & ~TYPE_QUAL_RESTRICT;
121 ctype = cp_build_qualified_type (ctype, type_quals);
122 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
123 (TREE_CODE (fntype) == METHOD_TYPE
124 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
125 : TYPE_ARG_TYPES (fntype)));
126 raises = TYPE_RAISES_EXCEPTIONS (fntype);
128 fntype = build_exception_variant (fntype, raises);
133 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
137 cp_build_parm_decl (tree name, tree type)
139 tree parm = build_decl (PARM_DECL, name, type);
140 /* DECL_ARG_TYPE is only used by the back end and the back end never
142 if (!processing_template_decl)
143 DECL_ARG_TYPE (parm) = type_passed_as (type);
147 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
151 build_artificial_parm (tree name, tree type)
153 tree parm = cp_build_parm_decl (name, type);
154 DECL_ARTIFICIAL (parm) = 1;
155 /* All our artificial parms are implicitly `const'; they cannot be
157 TREE_READONLY (parm) = 1;
161 /* Constructors for types with virtual baseclasses need an "in-charge" flag
162 saying whether this constructor is responsible for initialization of
163 virtual baseclasses or not. All destructors also need this "in-charge"
164 flag, which additionally determines whether or not the destructor should
165 free the memory for the object.
167 This function adds the "in-charge" flag to member function FN if
168 appropriate. It is called from grokclassfn and tsubst.
169 FN must be either a constructor or destructor.
171 The in-charge flag follows the 'this' parameter, and is followed by the
172 VTT parm (if any), then the user-written parms. */
175 maybe_retrofit_in_chrg (tree fn)
177 tree basetype, arg_types, parms, parm, fntype;
179 /* If we've already add the in-charge parameter don't do it again. */
180 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
183 /* When processing templates we can't know, in general, whether or
184 not we're going to have virtual baseclasses. */
185 if (processing_template_decl)
188 /* We don't need an in-charge parameter for constructors that don't
189 have virtual bases. */
190 if (DECL_CONSTRUCTOR_P (fn)
191 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
194 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
195 basetype = TREE_TYPE (TREE_VALUE (arg_types));
196 arg_types = TREE_CHAIN (arg_types);
198 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
200 /* If this is a subobject constructor or destructor, our caller will
201 pass us a pointer to our VTT. */
202 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
204 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
206 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
207 TREE_CHAIN (parm) = parms;
210 /* ...and then to TYPE_ARG_TYPES. */
211 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
213 DECL_HAS_VTT_PARM_P (fn) = 1;
216 /* Then add the in-charge parm (before the VTT parm). */
217 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
218 TREE_CHAIN (parm) = parms;
220 arg_types = hash_tree_chain (integer_type_node, arg_types);
222 /* Insert our new parameter(s) into the list. */
223 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
225 /* And rebuild the function type. */
226 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
228 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
229 fntype = build_exception_variant (fntype,
230 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
231 TREE_TYPE (fn) = fntype;
233 /* Now we've got the in-charge parameter. */
234 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
237 /* Classes overload their constituent function names automatically.
238 When a function name is declared in a record structure,
239 its name is changed to it overloaded name. Since names for
240 constructors and destructors can conflict, we place a leading
243 CNAME is the name of the class we are grokking for.
245 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
247 FLAGS contains bits saying what's special about today's
248 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
250 If FUNCTION is a destructor, then we must add the `auto-delete' field
251 as a second parameter. There is some hair associated with the fact
252 that we must "declare" this variable in the manner consistent with the
253 way the rest of the arguments were declared.
255 QUALS are the qualifiers for the this pointer. */
258 grokclassfn (tree ctype, tree function, enum overload_flags flags)
260 tree fn_name = DECL_NAME (function);
262 /* Even within an `extern "C"' block, members get C++ linkage. See
263 [dcl.link] for details. */
264 SET_DECL_LANGUAGE (function, lang_cplusplus);
266 if (fn_name == NULL_TREE)
268 error ("name missing for member function");
269 fn_name = get_identifier ("<anonymous>");
270 DECL_NAME (function) = fn_name;
273 DECL_CONTEXT (function) = ctype;
275 if (flags == DTOR_FLAG)
276 DECL_DESTRUCTOR_P (function) = 1;
278 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
279 maybe_retrofit_in_chrg (function);
282 /* Create an ARRAY_REF, checking for the user doing things backwards
286 grok_array_decl (tree array_expr, tree index_exp)
290 tree orig_array_expr = array_expr;
291 tree orig_index_exp = index_exp;
293 if (error_operand_p (array_expr) || error_operand_p (index_exp))
294 return error_mark_node;
296 if (processing_template_decl)
298 if (type_dependent_expression_p (array_expr)
299 || type_dependent_expression_p (index_exp))
300 return build_min_nt (ARRAY_REF, array_expr, index_exp,
301 NULL_TREE, NULL_TREE);
302 array_expr = build_non_dependent_expr (array_expr);
303 index_exp = build_non_dependent_expr (index_exp);
306 type = TREE_TYPE (array_expr);
308 type = non_reference (type);
310 /* If they have an `operator[]', use that. */
311 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
312 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
313 array_expr, index_exp, NULL_TREE,
314 /*overloaded_p=*/NULL);
319 /* Otherwise, create an ARRAY_REF for a pointer or array type.
320 It is a little-known fact that, if `a' is an array and `i' is
321 an int, you can write `i[a]', which means the same thing as
323 if (TREE_CODE (type) == ARRAY_TYPE)
326 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
328 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
331 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
333 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
335 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
338 if ((p1 && i2) && (i1 && p2))
339 error ("ambiguous conversion for array subscript");
342 array_expr = p1, index_exp = i2;
344 array_expr = p2, index_exp = i1;
347 error ("invalid types %<%T[%T]%> for array subscript",
348 type, TREE_TYPE (index_exp));
349 return error_mark_node;
352 if (array_expr == error_mark_node || index_exp == error_mark_node)
353 error ("ambiguous conversion for array subscript");
355 expr = build_array_ref (array_expr, index_exp);
357 if (processing_template_decl && expr != error_mark_node)
358 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
359 NULL_TREE, NULL_TREE);
363 /* Given the cast expression EXP, checking out its validity. Either return
364 an error_mark_node if there was an unavoidable error, return a cast to
365 void for trying to delete a pointer w/ the value 0, or return the
366 call to delete. If DOING_VEC is true, we handle things differently
367 for doing an array delete.
368 Implements ARM $5.3.4. This is called from the parser. */
371 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
375 if (exp == error_mark_node)
378 if (processing_template_decl)
380 t = build_min (DELETE_EXPR, void_type_node, exp, size);
381 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
382 DELETE_EXPR_USE_VEC (t) = doing_vec;
383 TREE_SIDE_EFFECTS (t) = 1;
387 /* An array can't have been allocated by new, so complain. */
388 if (TREE_CODE (exp) == VAR_DECL
389 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
390 warning (0, "deleting array %q#D", exp);
392 t = build_expr_type_conversion (WANT_POINTER, exp, true);
394 if (t == NULL_TREE || t == error_mark_node)
396 error ("type %q#T argument given to %<delete%>, expected pointer",
398 return error_mark_node;
401 type = TREE_TYPE (t);
403 /* As of Valley Forge, you can delete a pointer to const. */
405 /* You can't delete functions. */
406 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
408 error ("cannot delete a function. Only pointer-to-objects are "
409 "valid arguments to %<delete%>");
410 return error_mark_node;
413 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
414 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
416 warning (0, "deleting %qT is undefined", type);
420 /* Deleting a pointer with the value zero is valid and has no effect. */
421 if (integer_zerop (t))
422 return build1 (NOP_EXPR, void_type_node, t);
425 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
426 sfk_deleting_destructor,
429 return build_delete (type, t, sfk_deleting_destructor,
430 LOOKUP_NORMAL, use_global_delete);
433 /* Report an error if the indicated template declaration is not the
434 sort of thing that should be a member template. */
437 check_member_template (tree tmpl)
441 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
442 decl = DECL_TEMPLATE_RESULT (tmpl);
444 if (TREE_CODE (decl) == FUNCTION_DECL
445 || (TREE_CODE (decl) == TYPE_DECL
446 && IS_AGGR_TYPE (TREE_TYPE (decl))))
448 if (current_function_decl)
449 /* 14.5.2.2 [temp.mem]
451 A local class shall not have member templates. */
452 error ("invalid declaration of member template %q#D in local class",
455 /* The parser rejects any use of virtual in a function template. */
456 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
457 && DECL_VIRTUAL_P (decl)));
459 /* The debug-information generating code doesn't know what to do
460 with member templates. */
461 DECL_IGNORED_P (tmpl) = 1;
464 error ("template declaration of %q#D", decl);
467 /* Return true iff TYPE is a valid Java parameter or return type. */
470 acceptable_java_type (tree type)
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 error ("Java method %qD has non-Java parameter type %qT",
537 /* Sanity check: report error if this function FUNCTION is not
538 really a member of the class (CTYPE) it is supposed to belong to.
539 TEMPLATE_PARMS is used to specify the template parameters of a member
540 template passed as FUNCTION_DECL. If the member template is passed as a
541 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
542 from the declaration. If the function is not a function template, it
544 It returns the original declaration for the function, or NULL_TREE
545 if no declaration was found (and an error was emitted). */
548 check_classfn (tree ctype, tree function, tree template_parms)
553 if (DECL_USE_TEMPLATE (function)
554 && !(TREE_CODE (function) == TEMPLATE_DECL
555 && DECL_TEMPLATE_SPECIALIZATION (function))
556 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
557 /* Since this is a specialization of a member template,
558 we're not going to find the declaration in the class.
561 struct S { template <typename T> void f(T); };
562 template <> void S::f(int);
564 we're not going to find `S::f(int)', but there's no
565 reason we should, either. We let our callers know we didn't
566 find the method, but we don't complain. */
569 /* Basic sanity check: for a template function, the template parameters
570 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
571 if (TREE_CODE (function) == TEMPLATE_DECL)
573 gcc_assert (!template_parms
574 || comp_template_parms (template_parms,
575 DECL_TEMPLATE_PARMS (function)));
576 template_parms = DECL_TEMPLATE_PARMS (function);
579 /* OK, is this a definition of a member template? */
580 is_template = (template_parms != NULL_TREE);
582 ix = class_method_index_for_fn (complete_type (ctype), function);
585 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
586 tree fndecls, fndecl = 0;
589 const char *format = NULL;
591 pushed_scope = push_scope (ctype);
592 for (fndecls = VEC_index (tree, methods, ix);
593 fndecls; fndecls = OVL_NEXT (fndecls))
597 fndecl = OVL_CURRENT (fndecls);
598 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
599 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
601 /* We cannot simply call decls_match because this doesn't
602 work for static member functions that are pretending to
603 be methods, and because the name may have been changed by
606 /* Get rid of the this parameter on functions that become
608 if (DECL_STATIC_FUNCTION_P (fndecl)
609 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
610 p1 = TREE_CHAIN (p1);
612 /* A member template definition only matches a member template
614 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
617 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
618 TREE_TYPE (TREE_TYPE (fndecl)))
619 && compparms (p1, p2)
621 || comp_template_parms (template_parms,
622 DECL_TEMPLATE_PARMS (fndecl)))
623 && (DECL_TEMPLATE_SPECIALIZATION (function)
624 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
625 && (!DECL_TEMPLATE_SPECIALIZATION (function)
626 || (DECL_TI_TEMPLATE (function)
627 == DECL_TI_TEMPLATE (fndecl))))
631 pop_scope (pushed_scope);
633 return OVL_CURRENT (fndecls);
634 error ("prototype for %q#D does not match any in class %qT",
636 is_conv_op = DECL_CONV_FN_P (fndecl);
639 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
640 fndecls = VEC_index (tree, methods, ix);
643 fndecl = OVL_CURRENT (fndecls);
644 fndecls = OVL_NEXT (fndecls);
646 if (!fndecls && is_conv_op)
648 if (VEC_length (tree, methods) > (size_t) ++ix)
650 fndecls = VEC_index (tree, methods, ix);
651 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
663 format = N_("candidates are: %+#D");
665 format = N_("candidate is: %+#D");
666 error (format, fndecl);
669 else if (!COMPLETE_TYPE_P (ctype))
670 cxx_incomplete_type_error (function, ctype);
672 error ("no %q#D member function declared in class %qT",
675 /* If we did not find the method in the class, add it to avoid
676 spurious errors (unless the CTYPE is not yet defined, in which
677 case we'll only confuse ourselves when the function is declared
678 properly within the class. */
679 if (COMPLETE_TYPE_P (ctype))
680 add_method (ctype, function, NULL_TREE);
684 /* DECL is a function with vague linkage. Remember it so that at the
685 end of the translation unit we can decide whether or not to emit
689 note_vague_linkage_fn (tree decl)
691 if (!DECL_DEFERRED_FN (decl))
693 DECL_DEFERRED_FN (decl) = 1;
694 DECL_DEFER_OUTPUT (decl) = 1;
695 VEC_safe_push (tree, gc, deferred_fns, decl);
699 /* Like note_vague_linkage_fn but for variables. */
702 note_vague_linkage_var (tree var)
704 VEC_safe_push (tree, gc, pending_statics, var);
707 /* We have just processed the DECL, which is a static data member.
708 The other parameters are as for cp_finish_decl. */
711 finish_static_data_member_decl (tree decl,
712 tree init, bool init_const_expr_p,
716 gcc_assert (TREE_PUBLIC (decl));
718 DECL_CONTEXT (decl) = current_class_type;
720 /* We cannot call pushdecl here, because that would fill in the
721 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
722 the right thing, namely, to put this decl out straight away. */
724 if (! processing_template_decl)
725 note_vague_linkage_var (decl);
727 if (LOCAL_CLASS_P (current_class_type))
728 pedwarn ("local class %q#T shall not have static data member %q#D",
729 current_class_type, decl);
731 /* Static consts need not be initialized in the class definition. */
732 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
734 static int explained = 0;
736 error ("initializer invalid for static member with constructor");
739 error ("(an out of class initialization is required)");
744 /* Force the compiler to know when an uninitialized static const
745 member is being used. */
746 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
747 TREE_USED (decl) = 1;
748 DECL_INITIAL (decl) = init;
749 DECL_IN_AGGR_P (decl) = 1;
751 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
754 /* DECLARATOR and DECLSPECS correspond to a class member. The other
755 parameters are as for cp_finish_decl. Return the DECL for the
756 class member declared. */
759 grokfield (const cp_declarator *declarator,
760 cp_decl_specifier_seq *declspecs,
761 tree init, bool init_const_expr_p,
766 const char *asmspec = 0;
767 int flags = LOOKUP_ONLYCONVERTING;
769 if (!declspecs->any_specifiers_p
770 && declarator->kind == cdk_id
771 && declarator->u.id.qualifying_scope
772 && TREE_CODE (declarator->u.id.unqualified_name) == IDENTIFIER_NODE)
773 /* Access declaration */
774 return do_class_using_decl (declarator->u.id.qualifying_scope,
775 declarator->u.id.unqualified_name);
778 && TREE_CODE (init) == TREE_LIST
779 && TREE_VALUE (init) == error_mark_node
780 && TREE_CHAIN (init) == NULL_TREE)
783 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
784 if (! value || error_operand_p (value))
785 /* friend or constructor went bad. */
786 return error_mark_node;
788 if (TREE_CODE (value) == TYPE_DECL && init)
790 error ("typedef %qD is initialized (use __typeof__ instead)", value);
794 /* Pass friendly classes back. */
795 if (value == void_type_node)
798 /* Pass friend decls back. */
799 if ((TREE_CODE (value) == FUNCTION_DECL
800 || TREE_CODE (value) == TEMPLATE_DECL)
801 && DECL_CONTEXT (value) != current_class_type)
804 if (DECL_NAME (value) != NULL_TREE
805 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
806 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
807 error ("member %qD conflicts with virtual function table field name",
810 /* Stash away type declarations. */
811 if (TREE_CODE (value) == TYPE_DECL)
813 DECL_NONLOCAL (value) = 1;
814 DECL_CONTEXT (value) = current_class_type;
816 if (processing_template_decl)
817 value = push_template_decl (value);
821 /* Avoid storing attributes in template parameters:
822 tsubst is not ready to handle them. */
823 tree type = TREE_TYPE (value);
824 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
825 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
826 sorry ("applying attributes to template parameters is not implemented");
828 cplus_decl_attributes (&value, attrlist, 0);
834 if (DECL_IN_AGGR_P (value))
836 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
837 return void_type_node;
841 asmspec = TREE_STRING_POINTER (asmspec_tree);
845 if (TREE_CODE (value) == FUNCTION_DECL)
847 /* Initializers for functions are rejected early in the parser.
848 If we get here, it must be a pure specifier for a method. */
849 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
851 gcc_assert (error_operand_p (init) || integer_zerop (init));
852 DECL_PURE_VIRTUAL_P (value) = 1;
856 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
857 error ("initializer specified for static member function %qD",
861 else if (pedantic && TREE_CODE (value) != VAR_DECL)
862 /* Already complained in grokdeclarator. */
864 else if (!processing_template_decl)
866 if (TREE_CODE (init) == CONSTRUCTOR)
867 init = digest_init (TREE_TYPE (value), init);
869 init = integral_constant_value (init);
871 if (init != error_mark_node && !TREE_CONSTANT (init))
873 /* We can allow references to things that are effectively
874 static, since references are initialized with the
876 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
877 || (TREE_STATIC (init) == 0
878 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
880 error ("field initializer is not constant");
881 init = error_mark_node;
887 if (processing_template_decl
888 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
890 value = push_template_decl (value);
891 if (error_operand_p (value))
892 return error_mark_node;
896 cplus_decl_attributes (&value, attrlist, 0);
898 switch (TREE_CODE (value))
901 finish_static_data_member_decl (value, init, init_const_expr_p,
902 asmspec_tree, flags);
907 error ("%<asm%> specifiers are not permitted on non-static data members");
908 if (DECL_INITIAL (value) == error_mark_node)
909 init = error_mark_node;
910 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
912 DECL_INITIAL (value) = init;
913 DECL_IN_AGGR_P (value) = 1;
918 set_user_assembler_name (value, asmspec);
920 cp_finish_decl (value,
922 /*init_const_expr_p=*/false,
923 asmspec_tree, flags);
925 /* Pass friends back this way. */
926 if (DECL_FRIEND_P (value))
927 return void_type_node;
929 DECL_IN_AGGR_P (value) = 1;
938 /* Like `grokfield', but for bitfields.
939 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
942 grokbitfield (const cp_declarator *declarator,
943 cp_decl_specifier_seq *declspecs, tree width)
945 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
947 if (! value) return NULL_TREE; /* friends went bad. */
949 /* Pass friendly classes back. */
950 if (TREE_CODE (value) == VOID_TYPE)
951 return void_type_node;
953 if (TREE_CODE (value) == TYPE_DECL)
955 error ("cannot declare %qD to be a bit-field type", value);
959 /* Usually, finish_struct_1 catches bitfields with invalid types.
960 But, in the case of bitfields with function type, we confuse
961 ourselves into thinking they are member functions, so we must
963 if (TREE_CODE (value) == FUNCTION_DECL)
965 error ("cannot declare bit-field %qD with function type",
970 if (DECL_IN_AGGR_P (value))
972 error ("%qD is already defined in the class %qT", value,
973 DECL_CONTEXT (value));
974 return void_type_node;
977 if (TREE_STATIC (value))
979 error ("static member %qD cannot be a bit-field", value);
982 finish_decl (value, NULL_TREE, NULL_TREE);
984 if (width != error_mark_node)
986 constant_expression_warning (width);
987 DECL_INITIAL (value) = width;
988 SET_DECL_C_BIT_FIELD (value);
991 DECL_IN_AGGR_P (value) = 1;
997 cplus_decl_attributes (tree *decl, tree attributes, int flags)
999 if (*decl == NULL_TREE || *decl == void_type_node)
1002 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1003 decl = &DECL_TEMPLATE_RESULT (*decl);
1005 decl_attributes (decl, attributes, flags);
1007 if (TREE_CODE (*decl) == TYPE_DECL)
1008 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1011 /* Walks through the namespace- or function-scope anonymous union
1012 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1013 Returns one of the fields for use in the mangled name. */
1016 build_anon_union_vars (tree type, tree object)
1018 tree main_decl = NULL_TREE;
1021 /* Rather than write the code to handle the non-union case,
1022 just give an error. */
1023 if (TREE_CODE (type) != UNION_TYPE)
1024 error ("anonymous struct not inside named type");
1026 for (field = TYPE_FIELDS (type);
1028 field = TREE_CHAIN (field))
1033 if (DECL_ARTIFICIAL (field))
1035 if (TREE_CODE (field) != FIELD_DECL)
1037 pedwarn ("%q+#D invalid; an anonymous union can only "
1038 "have non-static data members", field);
1042 if (TREE_PRIVATE (field))
1043 pedwarn ("private member %q+#D in anonymous union", field);
1044 else if (TREE_PROTECTED (field))
1045 pedwarn ("protected member %q+#D in anonymous union", field);
1047 if (processing_template_decl)
1048 ref = build_min_nt (COMPONENT_REF, object,
1049 DECL_NAME (field), NULL_TREE);
1051 ref = build_class_member_access_expr (object, field, NULL_TREE,
1054 if (DECL_NAME (field))
1058 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1060 base = get_base_address (object);
1061 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1062 TREE_STATIC (decl) = TREE_STATIC (base);
1063 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1065 SET_DECL_VALUE_EXPR (decl, ref);
1066 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1068 decl = pushdecl (decl);
1070 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1071 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1075 if (main_decl == NULL_TREE)
1082 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1083 anonymous union, then all members must be laid out together. PUBLIC_P
1084 is nonzero if this union is not declared static. */
1087 finish_anon_union (tree anon_union_decl)
1093 if (anon_union_decl == error_mark_node)
1096 type = TREE_TYPE (anon_union_decl);
1097 public_p = TREE_PUBLIC (anon_union_decl);
1099 /* The VAR_DECL's context is the same as the TYPE's context. */
1100 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1102 if (TYPE_FIELDS (type) == NULL_TREE)
1107 error ("namespace-scope anonymous aggregates must be static");
1111 main_decl = build_anon_union_vars (type, anon_union_decl);
1112 if (main_decl == error_mark_node)
1114 if (main_decl == NULL_TREE)
1116 warning (0, "anonymous union with no members");
1120 if (!processing_template_decl)
1122 /* Use main_decl to set the mangled name. */
1123 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1124 mangle_decl (anon_union_decl);
1125 DECL_NAME (anon_union_decl) = NULL_TREE;
1128 pushdecl (anon_union_decl);
1129 if (building_stmt_tree ()
1130 && at_function_scope_p ())
1131 add_decl_expr (anon_union_decl);
1132 else if (!processing_template_decl)
1133 rest_of_decl_compilation (anon_union_decl,
1134 toplevel_bindings_p (), at_eof);
1137 /* Auxiliary functions to make type signatures for
1138 `operator new' and `operator delete' correspond to
1139 what compiler will be expecting. */
1142 coerce_new_type (tree type)
1145 tree args = TYPE_ARG_TYPES (type);
1147 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1149 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1152 error ("%<operator new%> must return type %qT", ptr_type_node);
1155 if (!args || args == void_list_node
1156 || !same_type_p (TREE_VALUE (args), size_type_node))
1159 if (args && args != void_list_node)
1160 args = TREE_CHAIN (args);
1161 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1162 "as first parameter", size_type_node);
1167 args = tree_cons (NULL_TREE, size_type_node, args);
1170 type = build_exception_variant
1171 (build_function_type (ptr_type_node, args),
1172 TYPE_RAISES_EXCEPTIONS (type));
1180 coerce_delete_type (tree type)
1183 tree args = TYPE_ARG_TYPES (type);
1185 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1187 if (!same_type_p (TREE_TYPE (type), void_type_node))
1190 error ("%<operator delete%> must return type %qT", void_type_node);
1193 if (!args || args == void_list_node
1194 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1197 if (args && args != void_list_node)
1198 args = TREE_CHAIN (args);
1199 error ("%<operator delete%> takes type %qT as first parameter",
1205 args = tree_cons (NULL_TREE, ptr_type_node, args);
1208 type = build_exception_variant
1209 (build_function_type (void_type_node, args),
1210 TYPE_RAISES_EXCEPTIONS (type));
1219 mark_vtable_entries (tree decl)
1222 unsigned HOST_WIDE_INT idx;
1224 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1229 STRIP_NOPS (fnaddr);
1231 if (TREE_CODE (fnaddr) != ADDR_EXPR
1232 && TREE_CODE (fnaddr) != FDESC_EXPR)
1233 /* This entry is an offset: a virtual base class offset, a
1234 virtual call offset, an RTTI offset, etc. */
1237 fn = TREE_OPERAND (fnaddr, 0);
1238 TREE_ADDRESSABLE (fn) = 1;
1239 /* When we don't have vcall offsets, we output thunks whenever
1240 we output the vtables that contain them. With vcall offsets,
1241 we know all the thunks we'll need when we emit a virtual
1242 function, so we emit the thunks there instead. */
1243 if (DECL_THUNK_P (fn))
1244 use_thunk (fn, /*emit_p=*/0);
1249 /* Set DECL up to have the closest approximation of "initialized common"
1250 linkage available. */
1253 comdat_linkage (tree decl)
1256 make_decl_one_only (decl);
1257 else if (TREE_CODE (decl) == FUNCTION_DECL
1258 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1259 /* We can just emit function and compiler-generated variables
1260 statically; having multiple copies is (for the most part) only
1263 There are two correctness issues, however: the address of a
1264 template instantiation with external linkage should be the
1265 same, independent of what translation unit asks for the
1266 address, and this will not hold when we emit multiple copies of
1267 the function. However, there's little else we can do.
1269 Also, by default, the typeinfo implementation assumes that
1270 there will be only one copy of the string used as the name for
1271 each type. Therefore, if weak symbols are unavailable, the
1272 run-time library should perform a more conservative check; it
1273 should perform a string comparison, rather than an address
1275 TREE_PUBLIC (decl) = 0;
1278 /* Static data member template instantiations, however, cannot
1279 have multiple copies. */
1280 if (DECL_INITIAL (decl) == 0
1281 || DECL_INITIAL (decl) == error_mark_node)
1282 DECL_COMMON (decl) = 1;
1283 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1285 DECL_COMMON (decl) = 1;
1286 DECL_INITIAL (decl) = error_mark_node;
1288 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1290 /* We can't do anything useful; leave vars for explicit
1292 DECL_EXTERNAL (decl) = 1;
1293 DECL_NOT_REALLY_EXTERN (decl) = 0;
1297 if (DECL_LANG_SPECIFIC (decl))
1298 DECL_COMDAT (decl) = 1;
1301 /* For win32 we also want to put explicit instantiations in
1302 linkonce sections, so that they will be merged with implicit
1303 instantiations; otherwise we get duplicate symbol errors.
1304 For Darwin we do not want explicit instantiations to be
1308 maybe_make_one_only (tree decl)
1310 /* We used to say that this was not necessary on targets that support weak
1311 symbols, because the implicit instantiations will defer to the explicit
1312 one. However, that's not actually the case in SVR4; a strong definition
1313 after a weak one is an error. Also, not making explicit
1314 instantiations one_only means that we can end up with two copies of
1315 some template instantiations. */
1319 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1320 we can get away with not emitting them if they aren't used. We need
1321 to for variables so that cp_finish_decl will update their linkage,
1322 because their DECL_INITIAL may not have been set properly yet. */
1324 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1325 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1326 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1328 make_decl_one_only (decl);
1330 if (TREE_CODE (decl) == VAR_DECL)
1332 DECL_COMDAT (decl) = 1;
1333 /* Mark it needed so we don't forget to emit it. */
1334 mark_decl_referenced (decl);
1339 /* Determine whether or not we want to specifically import or export CTYPE,
1340 using various heuristics. */
1343 import_export_class (tree ctype)
1345 /* -1 for imported, 1 for exported. */
1346 int import_export = 0;
1348 /* It only makes sense to call this function at EOF. The reason is
1349 that this function looks at whether or not the first non-inline
1350 non-abstract virtual member function has been defined in this
1351 translation unit. But, we can't possibly know that until we've
1352 seen the entire translation unit. */
1353 gcc_assert (at_eof);
1355 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1358 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1359 we will have CLASSTYPE_INTERFACE_ONLY set but not
1360 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1361 heuristic because someone will supply a #pragma implementation
1362 elsewhere, and deducing it here would produce a conflict. */
1363 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1366 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1368 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1370 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1371 && !flag_implicit_templates)
1372 /* For a template class, without -fimplicit-templates, check the
1373 repository. If the virtual table is assigned to this
1374 translation unit, then export the class; otherwise, import
1376 import_export = repo_export_class_p (ctype) ? 1 : -1;
1377 else if (TYPE_POLYMORPHIC_P (ctype))
1379 /* The ABI specifies that the virtual table and associated
1380 information are emitted with the key method, if any. */
1381 tree method = CLASSTYPE_KEY_METHOD (ctype);
1382 /* If weak symbol support is not available, then we must be
1383 careful not to emit the vtable when the key function is
1384 inline. An inline function can be defined in multiple
1385 translation units. If we were to emit the vtable in each
1386 translation unit containing a definition, we would get
1387 multiple definition errors at link-time. */
1388 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1389 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1392 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1393 a definition anywhere else. */
1394 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1397 /* Allow backends the chance to overrule the decision. */
1398 if (targetm.cxx.import_export_class)
1399 import_export = targetm.cxx.import_export_class (ctype, import_export);
1403 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1404 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1408 /* Return true if VAR has already been provided to the back end; in that
1409 case VAR should not be modified further by the front end. */
1411 var_finalized_p (tree var)
1413 return cgraph_varpool_node (var)->finalized;
1416 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1417 must be emitted in this translation unit. Mark it as such. */
1420 mark_needed (tree decl)
1422 /* It's possible that we no longer need to set
1423 TREE_SYMBOL_REFERENCED here directly, but doing so is
1425 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1426 mark_decl_referenced (decl);
1429 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1430 returns true if a definition of this entity should be provided in
1431 this object file. Callers use this function to determine whether
1432 or not to let the back end know that a definition of DECL is
1433 available in this translation unit. */
1436 decl_needed_p (tree decl)
1438 gcc_assert (TREE_CODE (decl) == VAR_DECL
1439 || TREE_CODE (decl) == FUNCTION_DECL);
1440 /* This function should only be called at the end of the translation
1441 unit. We cannot be sure of whether or not something will be
1442 COMDAT until that point. */
1443 gcc_assert (at_eof);
1445 /* All entities with external linkage that are not COMDAT should be
1446 emitted; they may be referred to from other object files. */
1447 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1449 /* If this entity was used, let the back-end see it; it will decide
1450 whether or not to emit it into the object file. */
1451 if (TREE_USED (decl)
1452 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1453 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1455 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1456 reference to DECL might cause it to be emitted later. */
1460 /* If necessary, write out the vtables for the dynamic class CTYPE.
1461 Returns true if any vtables were emitted. */
1464 maybe_emit_vtables (tree ctype)
1470 /* If the vtables for this class have already been emitted there is
1471 nothing more to do. */
1472 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1473 if (var_finalized_p (primary_vtbl))
1475 /* Ignore dummy vtables made by get_vtable_decl. */
1476 if (TREE_TYPE (primary_vtbl) == void_type_node)
1479 /* On some targets, we cannot determine the key method until the end
1480 of the translation unit -- which is when this function is
1482 if (!targetm.cxx.key_method_may_be_inline ())
1483 determine_key_method (ctype);
1485 /* See if any of the vtables are needed. */
1486 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1488 import_export_decl (vtbl);
1489 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1494 /* If the references to this class' vtables are optimized away,
1495 still emit the appropriate debugging information. See
1497 if (DECL_COMDAT (primary_vtbl)
1498 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1499 note_debug_info_needed (ctype);
1503 /* The ABI requires that we emit all of the vtables if we emit any
1505 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1507 /* Mark entities references from the virtual table as used. */
1508 mark_vtable_entries (vtbl);
1510 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1512 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1514 /* It had better be all done at compile-time. */
1519 DECL_EXTERNAL (vtbl) = 0;
1520 rest_of_decl_compilation (vtbl, 1, 1);
1522 /* Because we're only doing syntax-checking, we'll never end up
1523 actually marking the variable as written. */
1524 if (flag_syntax_only)
1525 TREE_ASM_WRITTEN (vtbl) = 1;
1528 /* Since we're writing out the vtable here, also write the debug
1530 note_debug_info_needed (ctype);
1535 /* Like c_determine_visibility, but with additional C++-specific
1538 Function-scope entities can rely on the function's visibility because
1539 it is set in start_preparsed_function.
1541 Class-scope entities cannot rely on the class's visibility until the end
1542 of the enclosing class definition.
1544 Note that because namespaces have multiple independent definitions,
1545 namespace visibility is handled elsewhere using the #pragma visibility
1546 machinery rather than by decorating the namespace declaration. */
1549 determine_visibility (tree decl)
1553 /* Only relevant for names with external linkage. */
1554 if (!TREE_PUBLIC (decl))
1557 /* Cloned constructors and destructors get the same visibility as
1558 the underlying function. That should be set up in
1559 maybe_clone_body. */
1560 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1562 /* Give the common code a chance to make a determination. */
1563 if (c_determine_visibility (decl))
1566 /* If DECL is a member of a class, visibility specifiers on the
1567 class can influence the visibility of the DECL. */
1568 if (DECL_CLASS_SCOPE_P (decl))
1569 class_type = DECL_CONTEXT (decl);
1570 else if (TREE_CODE (decl) == VAR_DECL
1571 && DECL_TINFO_P (decl)
1572 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1573 class_type = TREE_TYPE (DECL_NAME (decl));
1576 /* Virtual tables have DECL_CONTEXT set to their associated class,
1577 so they are automatically handled above. */
1578 gcc_assert (TREE_CODE (decl) != VAR_DECL
1579 || !DECL_VTABLE_OR_VTT_P (decl));
1581 if (DECL_FUNCTION_SCOPE_P (decl))
1583 tree fn = DECL_CONTEXT (decl);
1584 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1585 DECL_VISIBILITY_SPECIFIED (decl) = DECL_VISIBILITY_SPECIFIED (fn);
1588 /* Entities not associated with any class just get the
1589 visibility specified by their attributes. */
1593 /* By default, static data members and function members receive
1594 the visibility of their containing class. */
1597 determine_visibility_from_class (decl, class_type);
1599 /* Give the target a chance to override the visibility associated
1601 if (TREE_CODE (decl) == VAR_DECL
1602 && (DECL_TINFO_P (decl)
1603 || (DECL_VTABLE_OR_VTT_P (decl)
1604 /* Construction virtual tables are not exported because
1605 they cannot be referred to from other object files;
1606 their name is not standardized by the ABI. */
1607 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1608 && TREE_PUBLIC (decl)
1609 && !DECL_REALLY_EXTERN (decl)
1610 && DECL_VISIBILITY_SPECIFIED (decl)
1611 && (!class_type || !CLASSTYPE_VISIBILITY_SPECIFIED (class_type)))
1612 targetm.cxx.determine_class_data_visibility (decl);
1617 determine_visibility_from_class (tree decl, tree class_type)
1619 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1620 && lookup_attribute ("dllexport", TYPE_ATTRIBUTES (class_type)))
1622 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1623 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1625 else if (TREE_CODE (decl) == FUNCTION_DECL
1626 && DECL_DECLARED_INLINE_P (decl)
1627 && visibility_options.inlines_hidden)
1629 /* Don't change it if it has been set explicitly by user. */
1630 if (!DECL_VISIBILITY_SPECIFIED (decl))
1632 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1633 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1636 else if (CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1638 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1639 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1641 else if (TYPE_CLASS_SCOPE_P (class_type))
1642 determine_visibility_from_class (decl, TYPE_CONTEXT (class_type));
1643 else if (TYPE_FUNCTION_SCOPE_P (class_type))
1645 tree fn = TYPE_CONTEXT (class_type);
1646 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1647 DECL_VISIBILITY_SPECIFIED (decl) = DECL_VISIBILITY_SPECIFIED (fn);
1649 else if (!DECL_VISIBILITY_SPECIFIED (decl))
1651 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1652 DECL_VISIBILITY_SPECIFIED (decl) = 0;
1656 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1657 for DECL has not already been determined, do so now by setting
1658 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1659 function is called entities with vague linkage whose definitions
1660 are available must have TREE_PUBLIC set.
1662 If this function decides to place DECL in COMDAT, it will set
1663 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1664 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1665 callers defer that decision until it is clear that DECL is actually
1669 import_export_decl (tree decl)
1674 tree class_type = NULL_TREE;
1676 if (DECL_INTERFACE_KNOWN (decl))
1679 /* We cannot determine what linkage to give to an entity with vague
1680 linkage until the end of the file. For example, a virtual table
1681 for a class will be defined if and only if the key method is
1682 defined in this translation unit. As a further example, consider
1683 that when compiling a translation unit that uses PCH file with
1684 "-frepo" it would be incorrect to make decisions about what
1685 entities to emit when building the PCH; those decisions must be
1686 delayed until the repository information has been processed. */
1687 gcc_assert (at_eof);
1688 /* Object file linkage for explicit instantiations is handled in
1689 mark_decl_instantiated. For static variables in functions with
1690 vague linkage, maybe_commonize_var is used.
1692 Therefore, the only declarations that should be provided to this
1693 function are those with external linkage that are:
1695 * implicit instantiations of function templates
1699 * implicit instantiations of static data members of class
1706 Furthermore, all entities that reach this point must have a
1707 definition available in this translation unit.
1709 The following assertions check these conditions. */
1710 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1711 || TREE_CODE (decl) == VAR_DECL);
1712 /* Any code that creates entities with TREE_PUBLIC cleared should
1713 also set DECL_INTERFACE_KNOWN. */
1714 gcc_assert (TREE_PUBLIC (decl));
1715 if (TREE_CODE (decl) == FUNCTION_DECL)
1716 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1717 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1718 || DECL_DECLARED_INLINE_P (decl));
1720 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1721 || DECL_VTABLE_OR_VTT_P (decl)
1722 || DECL_TINFO_P (decl));
1723 /* Check that a definition of DECL is available in this translation
1725 gcc_assert (!DECL_REALLY_EXTERN (decl));
1727 /* Assume that DECL will not have COMDAT linkage. */
1729 /* Assume that DECL will not be imported into this translation
1733 /* See if the repository tells us whether or not to emit DECL in
1734 this translation unit. */
1735 emit_p = repo_emit_p (decl);
1738 else if (emit_p == 1)
1740 /* The repository indicates that this entity should be defined
1741 here. Make sure the back end honors that request. */
1742 if (TREE_CODE (decl) == VAR_DECL)
1744 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1745 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1748 FOR_EACH_CLONE (clone, decl)
1749 mark_needed (clone);
1753 /* Output the definition as an ordinary strong definition. */
1754 DECL_EXTERNAL (decl) = 0;
1755 DECL_INTERFACE_KNOWN (decl) = 1;
1760 /* We have already decided what to do with this DECL; there is no
1761 need to check anything further. */
1763 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1765 class_type = DECL_CONTEXT (decl);
1766 import_export_class (class_type);
1767 if (TYPE_FOR_JAVA (class_type))
1769 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
1770 && CLASSTYPE_INTERFACE_ONLY (class_type))
1772 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
1773 && !CLASSTYPE_USE_TEMPLATE (class_type)
1774 && CLASSTYPE_KEY_METHOD (class_type)
1775 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
1776 /* The ABI requires that all virtual tables be emitted with
1777 COMDAT linkage. However, on systems where COMDAT symbols
1778 don't show up in the table of contents for a static
1779 archive, or on systems without weak symbols (where we
1780 approximate COMDAT linkage by using internal linkage), the
1781 linker will report errors about undefined symbols because
1782 it will not see the virtual table definition. Therefore,
1783 in the case that we know that the virtual table will be
1784 emitted in only one translation unit, we make the virtual
1785 table an ordinary definition with external linkage. */
1786 DECL_EXTERNAL (decl) = 0;
1787 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
1789 /* CLASS_TYPE is being exported from this translation unit,
1790 so DECL should be defined here. */
1791 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
1792 /* If a class is declared in a header with the "extern
1793 template" extension, then it will not be instantiated,
1794 even in translation units that would normally require
1795 it. Often such classes are explicitly instantiated in
1796 one translation unit. Therefore, the explicit
1797 instantiation must be made visible to other translation
1799 DECL_EXTERNAL (decl) = 0;
1802 /* The generic C++ ABI says that class data is always
1803 COMDAT, even if there is a key function. Some
1804 variants (e.g., the ARM EABI) says that class data
1805 only has COMDAT linkage if the class data might be
1806 emitted in more than one translation unit. When the
1807 key method can be inline and is inline, we still have
1808 to arrange for comdat even though
1809 class_data_always_comdat is false. */
1810 if (!CLASSTYPE_KEY_METHOD (class_type)
1811 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
1812 || targetm.cxx.class_data_always_comdat ())
1814 /* The ABI requires COMDAT linkage. Normally, we
1815 only emit COMDAT things when they are needed;
1816 make sure that we realize that this entity is
1823 else if (!flag_implicit_templates
1824 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
1829 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1831 tree type = TREE_TYPE (DECL_NAME (decl));
1832 if (CLASS_TYPE_P (type))
1835 import_export_class (type);
1836 if (CLASSTYPE_INTERFACE_KNOWN (type)
1837 && TYPE_POLYMORPHIC_P (type)
1838 && CLASSTYPE_INTERFACE_ONLY (type)
1839 /* If -fno-rtti was specified, then we cannot be sure
1840 that RTTI information will be emitted with the
1841 virtual table of the class, so we must emit it
1842 wherever it is used. */
1847 if (CLASSTYPE_INTERFACE_KNOWN (type)
1848 && !CLASSTYPE_INTERFACE_ONLY (type))
1850 comdat_p = (targetm.cxx.class_data_always_comdat ()
1851 || (CLASSTYPE_KEY_METHOD (type)
1852 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
1857 DECL_EXTERNAL (decl) = 0;
1867 else if (DECL_TEMPLATE_INSTANTIATION (decl)
1868 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1870 /* DECL is an implicit instantiation of a function or static
1872 if (flag_implicit_templates
1873 || (flag_implicit_inline_templates
1874 && TREE_CODE (decl) == FUNCTION_DECL
1875 && DECL_DECLARED_INLINE_P (decl)))
1878 /* If we are not implicitly generating templates, then mark
1879 this entity as undefined in this translation unit. */
1882 else if (DECL_FUNCTION_MEMBER_P (decl))
1884 if (!DECL_DECLARED_INLINE_P (decl))
1886 tree ctype = DECL_CONTEXT (decl);
1887 import_export_class (ctype);
1888 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1890 DECL_NOT_REALLY_EXTERN (decl)
1891 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
1892 || (DECL_DECLARED_INLINE_P (decl)
1893 && ! flag_implement_inlines
1894 && !DECL_VINDEX (decl)));
1896 if (!DECL_NOT_REALLY_EXTERN (decl))
1897 DECL_EXTERNAL (decl) = 1;
1899 /* Always make artificials weak. */
1900 if (DECL_ARTIFICIAL (decl) && flag_weak)
1903 maybe_make_one_only (decl);
1914 /* If we are importing DECL into this translation unit, mark is
1915 an undefined here. */
1916 DECL_EXTERNAL (decl) = 1;
1917 DECL_NOT_REALLY_EXTERN (decl) = 0;
1921 /* If we decided to put DECL in COMDAT, mark it accordingly at
1923 comdat_linkage (decl);
1926 DECL_INTERFACE_KNOWN (decl) = 1;
1929 /* Return an expression that performs the destruction of DECL, which
1930 must be a VAR_DECL whose type has a non-trivial destructor, or is
1931 an array whose (innermost) elements have a non-trivial destructor. */
1934 build_cleanup (tree decl)
1937 tree type = TREE_TYPE (decl);
1939 /* This function should only be called for declarations that really
1940 require cleanups. */
1941 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
1943 /* Treat all objects with destructors as used; the destructor may do
1944 something substantive. */
1947 if (TREE_CODE (type) == ARRAY_TYPE)
1951 cxx_mark_addressable (decl);
1952 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
1954 temp = build_delete (TREE_TYPE (temp), temp,
1955 sfk_complete_destructor,
1956 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
1960 /* Returns the initialization guard variable for the variable DECL,
1961 which has static storage duration. */
1964 get_guard (tree decl)
1969 sname = mangle_guard_variable (decl);
1970 guard = IDENTIFIER_GLOBAL_VALUE (sname);
1975 /* We use a type that is big enough to contain a mutex as well
1976 as an integer counter. */
1977 guard_type = targetm.cxx.guard_type ();
1978 guard = build_decl (VAR_DECL, sname, guard_type);
1980 /* The guard should have the same linkage as what it guards. */
1981 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
1982 TREE_STATIC (guard) = TREE_STATIC (decl);
1983 DECL_COMMON (guard) = DECL_COMMON (decl);
1984 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
1985 if (TREE_PUBLIC (decl))
1986 DECL_WEAK (guard) = DECL_WEAK (decl);
1988 DECL_ARTIFICIAL (guard) = 1;
1989 DECL_IGNORED_P (guard) = 1;
1990 TREE_USED (guard) = 1;
1991 pushdecl_top_level_and_finish (guard, NULL_TREE);
1996 /* Return those bits of the GUARD variable that should be set when the
1997 guarded entity is actually initialized. */
2000 get_guard_bits (tree guard)
2002 if (!targetm.cxx.guard_mask_bit ())
2004 /* We only set the first byte of the guard, in order to leave room
2005 for a mutex in the high-order bits. */
2006 guard = build1 (ADDR_EXPR,
2007 build_pointer_type (TREE_TYPE (guard)),
2009 guard = build1 (NOP_EXPR,
2010 build_pointer_type (char_type_node),
2012 guard = build1 (INDIRECT_REF, char_type_node, guard);
2018 /* Return an expression which determines whether or not the GUARD
2019 variable has already been initialized. */
2022 get_guard_cond (tree guard)
2026 /* Check to see if the GUARD is zero. */
2027 guard = get_guard_bits (guard);
2029 /* Mask off all but the low bit. */
2030 if (targetm.cxx.guard_mask_bit ())
2032 guard_value = integer_one_node;
2033 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2034 guard_value = convert (TREE_TYPE (guard), guard_value);
2035 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2038 guard_value = integer_zero_node;
2039 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2040 guard_value = convert (TREE_TYPE (guard), guard_value);
2041 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2044 /* Return an expression which sets the GUARD variable, indicating that
2045 the variable being guarded has been initialized. */
2048 set_guard (tree guard)
2052 /* Set the GUARD to one. */
2053 guard = get_guard_bits (guard);
2054 guard_init = integer_one_node;
2055 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2056 guard_init = convert (TREE_TYPE (guard), guard_init);
2057 return build_modify_expr (guard, NOP_EXPR, guard_init);
2060 /* Start the process of running a particular set of global constructors
2061 or destructors. Subroutine of do_[cd]tors. */
2064 start_objects (int method_type, int initp)
2070 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2072 if (initp != DEFAULT_INIT_PRIORITY)
2082 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2085 sprintf (type, "%c", method_type);
2087 fndecl = build_lang_decl (FUNCTION_DECL,
2088 get_file_function_name_long (type),
2089 build_function_type (void_type_node,
2091 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2093 /* It can be a static function as long as collect2 does not have
2094 to scan the object file to find its ctor/dtor routine. */
2095 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2097 /* Mark this declaration as used to avoid spurious warnings. */
2098 TREE_USED (current_function_decl) = 1;
2100 /* Mark this function as a global constructor or destructor. */
2101 if (method_type == 'I')
2102 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2104 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2105 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2107 body = begin_compound_stmt (BCS_FN_BODY);
2109 /* We cannot allow these functions to be elided, even if they do not
2110 have external linkage. And, there's no point in deferring
2111 compilation of these functions; they're all going to have to be
2113 DECL_INLINE (current_function_decl) = 0;
2114 DECL_UNINLINABLE (current_function_decl) = 1;
2119 /* Finish the process of running a particular set of global constructors
2120 or destructors. Subroutine of do_[cd]tors. */
2123 finish_objects (int method_type, int initp, tree body)
2128 finish_compound_stmt (body);
2129 fn = finish_function (0);
2130 expand_or_defer_fn (fn);
2132 /* When only doing semantic analysis, and no RTL generation, we
2133 can't call functions that directly emit assembly code; there is
2134 no assembly file in which to put the code. */
2135 if (flag_syntax_only)
2138 if (targetm.have_ctors_dtors)
2140 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2141 cgraph_mark_needed_node (cgraph_node (fn));
2142 if (method_type == 'I')
2143 (* targetm.asm_out.constructor) (fnsym, initp);
2145 (* targetm.asm_out.destructor) (fnsym, initp);
2149 /* The names of the parameters to the function created to handle
2150 initializations and destructions for objects with static storage
2152 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2153 #define PRIORITY_IDENTIFIER "__priority"
2155 /* The name of the function we create to handle initializations and
2156 destructions for objects with static storage duration. */
2157 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2159 /* The declaration for the __INITIALIZE_P argument. */
2160 static GTY(()) tree initialize_p_decl;
2162 /* The declaration for the __PRIORITY argument. */
2163 static GTY(()) tree priority_decl;
2165 /* The declaration for the static storage duration function. */
2166 static GTY(()) tree ssdf_decl;
2168 /* All the static storage duration functions created in this
2169 translation unit. */
2170 static GTY(()) VEC(tree,gc) *ssdf_decls;
2172 /* A map from priority levels to information about that priority
2173 level. There may be many such levels, so efficient lookup is
2175 static splay_tree priority_info_map;
2177 /* Begins the generation of the function that will handle all
2178 initialization and destruction of objects with static storage
2179 duration. The function generated takes two parameters of type
2180 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2181 nonzero, it performs initializations. Otherwise, it performs
2182 destructions. It only performs those initializations or
2183 destructions with the indicated __PRIORITY. The generated function
2186 It is assumed that this function will only be called once per
2187 translation unit. */
2190 start_static_storage_duration_function (unsigned count)
2195 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2197 /* Create the identifier for this function. It will be of the form
2198 SSDF_IDENTIFIER_<number>. */
2199 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2201 /* Create the parameters. */
2202 parm_types = void_list_node;
2203 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2204 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2205 type = build_function_type (void_type_node, parm_types);
2207 /* Create the FUNCTION_DECL itself. */
2208 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2209 get_identifier (id),
2211 TREE_PUBLIC (ssdf_decl) = 0;
2212 DECL_ARTIFICIAL (ssdf_decl) = 1;
2214 /* Put this function in the list of functions to be called from the
2215 static constructors and destructors. */
2218 ssdf_decls = VEC_alloc (tree, gc, 32);
2220 /* Take this opportunity to initialize the map from priority
2221 numbers to information about that priority level. */
2222 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2223 /*delete_key_fn=*/0,
2224 /*delete_value_fn=*/
2225 (splay_tree_delete_value_fn) &free);
2227 /* We always need to generate functions for the
2228 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2229 priorities later, we'll be sure to find the
2230 DEFAULT_INIT_PRIORITY. */
2231 get_priority_info (DEFAULT_INIT_PRIORITY);
2234 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2236 /* Create the argument list. */
2237 initialize_p_decl = cp_build_parm_decl
2238 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2239 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2240 TREE_USED (initialize_p_decl) = 1;
2241 priority_decl = cp_build_parm_decl
2242 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2243 DECL_CONTEXT (priority_decl) = ssdf_decl;
2244 TREE_USED (priority_decl) = 1;
2246 TREE_CHAIN (initialize_p_decl) = priority_decl;
2247 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2249 /* Put the function in the global scope. */
2250 pushdecl (ssdf_decl);
2252 /* Start the function itself. This is equivalent to declaring the
2255 static void __ssdf (int __initialize_p, init __priority_p);
2257 It is static because we only need to call this function from the
2258 various constructor and destructor functions for this module. */
2259 start_preparsed_function (ssdf_decl,
2260 /*attrs=*/NULL_TREE,
2263 /* Set up the scope of the outermost block in the function. */
2264 body = begin_compound_stmt (BCS_FN_BODY);
2266 /* This function must not be deferred because we are depending on
2267 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2268 DECL_INLINE (ssdf_decl) = 0;
2269 DECL_UNINLINABLE (ssdf_decl) = 1;
2274 /* Finish the generation of the function which performs initialization
2275 and destruction of objects with static storage duration. After
2276 this point, no more such objects can be created. */
2279 finish_static_storage_duration_function (tree body)
2281 /* Close out the function. */
2282 finish_compound_stmt (body);
2283 expand_or_defer_fn (finish_function (0));
2286 /* Return the information about the indicated PRIORITY level. If no
2287 code to handle this level has yet been generated, generate the
2288 appropriate prologue. */
2290 static priority_info
2291 get_priority_info (int priority)
2296 n = splay_tree_lookup (priority_info_map,
2297 (splay_tree_key) priority);
2300 /* Create a new priority information structure, and insert it
2302 pi = XNEW (struct priority_info_s);
2303 pi->initializations_p = 0;
2304 pi->destructions_p = 0;
2305 splay_tree_insert (priority_info_map,
2306 (splay_tree_key) priority,
2307 (splay_tree_value) pi);
2310 pi = (priority_info) n->value;
2315 /* The effective initialization priority of a DECL. */
2317 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2318 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2319 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2321 /* Whether a DECL needs a guard to protect it against multiple
2324 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2325 || DECL_ONE_ONLY (decl) \
2326 || DECL_WEAK (decl)))
2328 /* Set up to handle the initialization or destruction of DECL. If
2329 INITP is nonzero, we are initializing the variable. Otherwise, we
2330 are destroying it. */
2333 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2335 tree guard_if_stmt = NULL_TREE;
2338 /* If we are supposed to destruct and there's a trivial destructor,
2339 nothing has to be done. */
2341 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2344 /* Trick the compiler into thinking we are at the file and line
2345 where DECL was declared so that error-messages make sense, and so
2346 that the debugger will show somewhat sensible file and line
2348 input_location = DECL_SOURCE_LOCATION (decl);
2354 Access control for implicit calls to the constructors,
2355 the conversion functions, or the destructor called to
2356 create and destroy a static data member is performed as
2357 if these calls appeared in the scope of the member's
2360 we pretend we are in a static member function of the class of
2361 which the DECL is a member. */
2362 if (member_p (decl))
2364 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2365 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2368 /* Assume we don't need a guard. */
2370 /* We need a guard if this is an object with external linkage that
2371 might be initialized in more than one place. (For example, a
2372 static data member of a template, when the data member requires
2374 if (NEEDS_GUARD_P (decl))
2378 guard = get_guard (decl);
2380 /* When using __cxa_atexit, we just check the GUARD as we would
2381 for a local static. */
2382 if (flag_use_cxa_atexit)
2384 /* When using __cxa_atexit, we never try to destroy
2385 anything from a static destructor. */
2387 guard_cond = get_guard_cond (guard);
2389 /* If we don't have __cxa_atexit, then we will be running
2390 destructors from .fini sections, or their equivalents. So,
2391 we need to know how many times we've tried to initialize this
2392 object. We do initializations only if the GUARD is zero,
2393 i.e., if we are the first to initialize the variable. We do
2394 destructions only if the GUARD is one, i.e., if we are the
2395 last to destroy the variable. */
2398 = cp_build_binary_op (EQ_EXPR,
2399 build_unary_op (PREINCREMENT_EXPR,
2405 = cp_build_binary_op (EQ_EXPR,
2406 build_unary_op (PREDECREMENT_EXPR,
2411 guard_if_stmt = begin_if_stmt ();
2412 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2416 /* If we're using __cxa_atexit, we have not already set the GUARD,
2417 so we must do so now. */
2418 if (guard && initp && flag_use_cxa_atexit)
2419 finish_expr_stmt (set_guard (guard));
2421 /* Perform the initialization or destruction. */
2425 finish_expr_stmt (init);
2427 /* If we're using __cxa_atexit, register a function that calls the
2428 destructor for the object. */
2429 if (flag_use_cxa_atexit)
2430 finish_expr_stmt (register_dtor_fn (decl));
2433 finish_expr_stmt (build_cleanup (decl));
2435 /* Finish the guard if-stmt, if necessary. */
2438 finish_then_clause (guard_if_stmt);
2439 finish_if_stmt (guard_if_stmt);
2442 /* Now that we're done with DECL we don't need to pretend to be a
2443 member of its class any longer. */
2444 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2445 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2448 /* Generate code to do the initialization or destruction of the decls in VARS,
2449 a TREE_LIST of VAR_DECL with static storage duration.
2450 Whether initialization or destruction is performed is specified by INITP. */
2453 do_static_initialization_or_destruction (tree vars, bool initp)
2455 tree node, init_if_stmt, cond;
2457 /* Build the outer if-stmt to check for initialization or destruction. */
2458 init_if_stmt = begin_if_stmt ();
2459 cond = initp ? integer_one_node : integer_zero_node;
2460 cond = cp_build_binary_op (EQ_EXPR,
2463 finish_if_stmt_cond (cond, init_if_stmt);
2467 tree decl = TREE_VALUE (node);
2468 tree priority_if_stmt;
2472 /* If we don't need a destructor, there's nothing to do. Avoid
2473 creating a possibly empty if-stmt. */
2474 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2476 node = TREE_CHAIN (node);
2480 /* Remember that we had an initialization or finalization at this
2482 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2483 pi = get_priority_info (priority);
2485 pi->initializations_p = 1;
2487 pi->destructions_p = 1;
2489 /* Conditionalize this initialization on being in the right priority
2490 and being initializing/finalizing appropriately. */
2491 priority_if_stmt = begin_if_stmt ();
2492 cond = cp_build_binary_op (EQ_EXPR,
2494 build_int_cst (NULL_TREE, priority));
2495 finish_if_stmt_cond (cond, priority_if_stmt);
2497 /* Process initializers with same priority. */
2499 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2500 node = TREE_CHAIN (node))
2501 /* Do one initialization or destruction. */
2502 one_static_initialization_or_destruction (TREE_VALUE (node),
2503 TREE_PURPOSE (node), initp);
2505 /* Finish up the priority if-stmt body. */
2506 finish_then_clause (priority_if_stmt);
2507 finish_if_stmt (priority_if_stmt);
2511 /* Finish up the init/destruct if-stmt body. */
2512 finish_then_clause (init_if_stmt);
2513 finish_if_stmt (init_if_stmt);
2516 /* VARS is a list of variables with static storage duration which may
2517 need initialization and/or finalization. Remove those variables
2518 that don't really need to be initialized or finalized, and return
2519 the resulting list. The order in which the variables appear in
2520 VARS is in reverse order of the order in which they should actually
2521 be initialized. The list we return is in the unreversed order;
2522 i.e., the first variable should be initialized first. */
2525 prune_vars_needing_no_initialization (tree *vars)
2528 tree result = NULL_TREE;
2533 tree decl = TREE_VALUE (t);
2534 tree init = TREE_PURPOSE (t);
2536 /* Deal gracefully with error. */
2537 if (decl == error_mark_node)
2539 var = &TREE_CHAIN (t);
2543 /* The only things that can be initialized are variables. */
2544 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2546 /* If this object is not defined, we don't need to do anything
2548 if (DECL_EXTERNAL (decl))
2550 var = &TREE_CHAIN (t);
2554 /* Also, if the initializer already contains errors, we can bail
2556 if (init && TREE_CODE (init) == TREE_LIST
2557 && value_member (error_mark_node, init))
2559 var = &TREE_CHAIN (t);
2563 /* This variable is going to need initialization and/or
2564 finalization, so we add it to the list. */
2565 *var = TREE_CHAIN (t);
2566 TREE_CHAIN (t) = result;
2573 /* Make sure we have told the back end about all the variables in
2577 write_out_vars (tree vars)
2581 for (v = vars; v; v = TREE_CHAIN (v))
2583 tree var = TREE_VALUE (v);
2584 if (!var_finalized_p (var))
2586 import_export_decl (var);
2587 rest_of_decl_compilation (var, 1, 1);
2592 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2593 (otherwise) that will initialize all gobal objects with static
2594 storage duration having the indicated PRIORITY. */
2597 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2606 input_location = *locus;
2607 #ifdef USE_MAPPED_LOCATION
2613 /* We use `I' to indicate initialization and `D' to indicate
2615 function_key = constructor_p ? 'I' : 'D';
2617 /* We emit the function lazily, to avoid generating empty
2618 global constructors and destructors. */
2621 /* For Objective-C++, we may need to initialize metadata found in this module.
2622 This must be done _before_ any other static initializations. */
2623 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2624 && constructor_p && objc_static_init_needed_p ())
2626 body = start_objects (function_key, priority);
2627 static_ctors = objc_generate_static_init_call (static_ctors);
2630 /* Call the static storage duration function with appropriate
2632 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2634 /* Calls to pure or const functions will expand to nothing. */
2635 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2638 body = start_objects (function_key, priority);
2640 arguments = tree_cons (NULL_TREE,
2641 build_int_cst (NULL_TREE, priority),
2643 arguments = tree_cons (NULL_TREE,
2644 build_int_cst (NULL_TREE, constructor_p),
2646 finish_expr_stmt (build_function_call (fndecl, arguments));
2650 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2651 calls to any functions marked with attributes indicating that
2652 they should be called at initialization- or destruction-time. */
2653 if (priority == DEFAULT_INIT_PRIORITY)
2657 for (fns = constructor_p ? static_ctors : static_dtors;
2659 fns = TREE_CHAIN (fns))
2661 fndecl = TREE_VALUE (fns);
2663 /* Calls to pure/const functions will expand to nothing. */
2664 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2667 body = start_objects (function_key, priority);
2668 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2673 /* Close out the function. */
2675 finish_objects (function_key, priority, body);
2678 /* Generate constructor and destructor functions for the priority
2682 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2684 location_t *locus = (location_t *) data;
2685 int priority = (int) n->key;
2686 priority_info pi = (priority_info) n->value;
2688 /* Generate the functions themselves, but only if they are really
2690 if (pi->initializations_p
2691 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2692 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2693 if (pi->destructions_p
2694 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2695 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2697 /* Keep iterating. */
2701 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2702 decls referenced from frontend specific constructs; it will be called
2703 only for language-specific tree nodes.
2705 Here we must deal with member pointers. */
2708 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2709 tree from ATTRIBUTE_UNUSED)
2713 switch (TREE_CODE (t))
2716 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2717 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2720 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2721 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2724 if (DECL_VTABLE_OR_VTT_P (t))
2726 /* The ABI requires that all virtual tables be emitted
2727 whenever one of them is. */
2729 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2731 vtbl = TREE_CHAIN (vtbl))
2732 mark_decl_referenced (vtbl);
2734 else if (DECL_CONTEXT (t)
2735 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2736 /* If we need a static variable in a function, then we
2737 need the containing function. */
2738 mark_decl_referenced (DECL_CONTEXT (t));
2747 /* Java requires that we be able to reference a local address for a
2748 method, and not be confused by PLT entries. If hidden aliases are
2749 supported, emit one for each java function that we've emitted. */
2752 build_java_method_aliases (void)
2754 struct cgraph_node *node;
2756 #ifndef HAVE_GAS_HIDDEN
2760 for (node = cgraph_nodes; node ; node = node->next)
2762 tree fndecl = node->decl;
2764 if (TREE_ASM_WRITTEN (fndecl)
2765 && DECL_CONTEXT (fndecl)
2766 && TYPE_P (DECL_CONTEXT (fndecl))
2767 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2768 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
2770 /* Mangle the name in a predictable way; we need to reference
2771 this from a java compiled object file. */
2772 tree oid, nid, alias;
2776 oid = DECL_ASSEMBLER_NAME (fndecl);
2777 oname = IDENTIFIER_POINTER (oid);
2778 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
2779 nname = ACONCAT (("_ZGA", oname+2, NULL));
2780 nid = get_identifier (nname);
2782 alias = make_alias_for (fndecl, nid);
2783 TREE_PUBLIC (alias) = 1;
2784 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
2786 assemble_alias (alias, oid);
2791 /* This routine is called from the last rule in yyparse ().
2792 Its job is to create all the code needed to initialize and
2793 destroy the global aggregates. We do the destruction
2794 first, since that way we only need to reverse the decls once. */
2797 cp_finish_file (void)
2803 unsigned ssdf_count = 0;
2807 locus = input_location;
2810 /* Bad parse errors. Just forget about it. */
2811 if (! global_bindings_p () || current_class_type || decl_namespace_list)
2815 c_common_write_pch ();
2817 #ifdef USE_MAPPED_LOCATION
2820 /* Otherwise, GDB can get confused, because in only knows
2821 about source for LINENO-1 lines. */
2825 /* We now have to write out all the stuff we put off writing out.
2828 o Template specializations that we have not yet instantiated,
2829 but which are needed.
2830 o Initialization and destruction for non-local objects with
2831 static storage duration. (Local objects with static storage
2832 duration are initialized when their scope is first entered,
2833 and are cleaned up via atexit.)
2834 o Virtual function tables.
2836 All of these may cause others to be needed. For example,
2837 instantiating one function may cause another to be needed, and
2838 generating the initializer for an object may cause templates to be
2839 instantiated, etc., etc. */
2841 timevar_push (TV_VARCONST);
2843 emit_support_tinfos ();
2852 /* If there are templates that we've put off instantiating, do
2854 instantiate_pending_templates (retries);
2857 /* Write out virtual tables as required. Note that writing out
2858 the virtual table for a template class may cause the
2859 instantiation of members of that class. If we write out
2860 vtables then we remove the class from our list so we don't
2861 have to look at it again. */
2863 while (keyed_classes != NULL_TREE
2864 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
2867 keyed_classes = TREE_CHAIN (keyed_classes);
2873 tree next = TREE_CHAIN (t);
2877 if (maybe_emit_vtables (TREE_VALUE (next)))
2880 TREE_CHAIN (t) = TREE_CHAIN (next);
2885 next = TREE_CHAIN (t);
2889 /* Write out needed type info variables. We have to be careful
2890 looping through unemitted decls, because emit_tinfo_decl may
2891 cause other variables to be needed. New elements will be
2892 appended, and we remove from the vector those that actually
2894 for (i = VEC_length (tree, unemitted_tinfo_decls);
2895 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
2896 if (emit_tinfo_decl (t))
2899 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
2902 /* The list of objects with static storage duration is built up
2903 in reverse order. We clear STATIC_AGGREGATES so that any new
2904 aggregates added during the initialization of these will be
2905 initialized in the correct order when we next come around the
2907 vars = prune_vars_needing_no_initialization (&static_aggregates);
2911 /* We need to start a new initialization function each time
2912 through the loop. That's because we need to know which
2913 vtables have been referenced, and TREE_SYMBOL_REFERENCED
2914 isn't computed until a function is finished, and written
2915 out. That's a deficiency in the back-end. When this is
2916 fixed, these initialization functions could all become
2917 inline, with resulting performance improvements. */
2920 /* Set the line and file, so that it is obviously not from
2922 input_location = locus;
2923 ssdf_body = start_static_storage_duration_function (ssdf_count);
2925 /* Make sure the back end knows about all the variables. */
2926 write_out_vars (vars);
2928 /* First generate code to do all the initializations. */
2930 do_static_initialization_or_destruction (vars, /*initp=*/true);
2932 /* Then, generate code to do all the destructions. Do these
2933 in reverse order so that the most recently constructed
2934 variable is the first destroyed. If we're using
2935 __cxa_atexit, then we don't need to do this; functions
2936 were registered at initialization time to destroy the
2938 if (!flag_use_cxa_atexit && vars)
2940 vars = nreverse (vars);
2941 do_static_initialization_or_destruction (vars, /*initp=*/false);
2946 /* Finish up the static storage duration function for this
2948 input_location = locus;
2949 finish_static_storage_duration_function (ssdf_body);
2951 /* All those initializations and finalizations might cause
2952 us to need more inline functions, more template
2953 instantiations, etc. */
2956 #ifdef USE_MAPPED_LOCATION
2963 /* Go through the set of inline functions whose bodies have not
2964 been emitted yet. If out-of-line copies of these functions
2965 are required, emit them. */
2966 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
2968 /* Does it need synthesizing? */
2969 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
2970 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
2972 /* Even though we're already at the top-level, we push
2973 there again. That way, when we pop back a few lines
2974 hence, all of our state is restored. Otherwise,
2975 finish_function doesn't clean things up, and we end
2976 up with CURRENT_FUNCTION_DECL set. */
2977 push_to_top_level ();
2978 /* The decl's location will mark where it was first
2979 needed. Save that so synthesize method can indicate
2980 where it was needed from, in case of error */
2981 input_location = DECL_SOURCE_LOCATION (decl);
2982 synthesize_method (decl);
2983 pop_from_top_level ();
2987 if (!DECL_SAVED_TREE (decl))
2990 /* We lie to the back-end, pretending that some functions
2991 are not defined when they really are. This keeps these
2992 functions from being put out unnecessarily. But, we must
2993 stop lying when the functions are referenced, or if they
2994 are not comdat since they need to be put out now. If
2995 DECL_INTERFACE_KNOWN, then we have already set
2996 DECL_EXTERNAL appropriately, so there's no need to check
2997 again, and we do not want to clear DECL_EXTERNAL if a
2998 previous call to import_export_decl set it.
3000 This is done in a separate for cycle, because if some
3001 deferred function is contained in another deferred
3002 function later in deferred_fns varray,
3003 rest_of_compilation would skip this function and we
3004 really cannot expand the same function twice. */
3005 import_export_decl (decl);
3006 if (DECL_NOT_REALLY_EXTERN (decl)
3007 && DECL_INITIAL (decl)
3008 && decl_needed_p (decl))
3009 DECL_EXTERNAL (decl) = 0;
3011 /* If we're going to need to write this function out, and
3012 there's already a body for it, create RTL for it now.
3013 (There might be no body if this is a method we haven't
3014 gotten around to synthesizing yet.) */
3015 if (!DECL_EXTERNAL (decl)
3016 && decl_needed_p (decl)
3017 && !TREE_ASM_WRITTEN (decl)
3018 && !cgraph_node (decl)->local.finalized)
3020 /* We will output the function; no longer consider it in this
3022 DECL_DEFER_OUTPUT (decl) = 0;
3023 /* Generate RTL for this function now that we know we
3025 expand_or_defer_fn (decl);
3026 /* If we're compiling -fsyntax-only pretend that this
3027 function has been written out so that we don't try to
3029 if (flag_syntax_only)
3030 TREE_ASM_WRITTEN (decl) = 1;
3035 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3038 /* Static data members are just like namespace-scope globals. */
3039 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3041 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3043 import_export_decl (decl);
3044 /* If this static data member is needed, provide it to the
3046 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3047 DECL_EXTERNAL (decl) = 0;
3049 if (VEC_length (tree, pending_statics) != 0
3050 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3051 VEC_length (tree, pending_statics)))
3058 /* All used inline functions must have a definition at this point. */
3059 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3061 if (/* Check online inline functions that were actually used. */
3062 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3063 /* If the definition actually was available here, then the
3064 fact that the function was not defined merely represents
3065 that for some reason (use of a template repository,
3066 #pragma interface, etc.) we decided not to emit the
3068 && !DECL_INITIAL (decl)
3069 /* An explicit instantiation can be used to specify
3070 that the body is in another unit. It will have
3071 already verified there was a definition. */
3072 && !DECL_EXPLICIT_INSTANTIATION (decl))
3074 warning (0, "inline function %q+D used but never defined", decl);
3075 /* Avoid a duplicate warning from check_global_declaration_1. */
3076 TREE_NO_WARNING (decl) = 1;
3080 /* We give C linkage to static constructors and destructors. */
3081 push_lang_context (lang_name_c);
3083 /* Generate initialization and destruction functions for all
3084 priorities for which they are required. */
3085 if (priority_info_map)
3086 splay_tree_foreach (priority_info_map,
3087 generate_ctor_and_dtor_functions_for_priority,
3091 /* If we have a ctor or this is obj-c++ and we need a static init,
3092 call generate_ctor_or_dtor_function. */
3093 if (static_ctors || (c_dialect_objc () && objc_static_init_needed_p ()))
3094 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3095 DEFAULT_INIT_PRIORITY, &locus);
3097 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3098 DEFAULT_INIT_PRIORITY, &locus);
3101 /* We're done with the splay-tree now. */
3102 if (priority_info_map)
3103 splay_tree_delete (priority_info_map);
3105 /* Generate any missing aliases. */
3106 maybe_apply_pending_pragma_weaks ();
3108 /* We're done with static constructors, so we can go back to "C++"
3110 pop_lang_context ();
3112 cgraph_finalize_compilation_unit ();
3115 /* Now, issue warnings about static, but not defined, functions,
3116 etc., and emit debugging information. */
3117 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3118 if (VEC_length (tree, pending_statics) != 0)
3120 check_global_declarations (VEC_address (tree, pending_statics),
3121 VEC_length (tree, pending_statics));
3122 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3123 VEC_length (tree, pending_statics));
3126 /* Generate hidden aliases for Java. */
3127 build_java_method_aliases ();
3131 /* The entire file is now complete. If requested, dump everything
3135 FILE *stream = dump_begin (TDI_tu, &flags);
3139 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3140 dump_end (TDI_tu, stream);
3144 timevar_pop (TV_VARCONST);
3146 if (flag_detailed_statistics)
3148 dump_tree_statistics ();
3149 dump_time_statistics ();
3151 input_location = locus;
3153 #ifdef ENABLE_CHECKING
3154 validate_conversion_obstack ();
3155 #endif /* ENABLE_CHECKING */
3158 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3159 function to call in parse-tree form; it has not yet been
3160 semantically analyzed. ARGS are the arguments to the function.
3161 They have already been semantically analyzed. */
3164 build_offset_ref_call_from_tree (tree fn, tree args)
3173 object = TREE_OPERAND (fn, 0);
3175 if (processing_template_decl)
3177 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3178 || TREE_CODE (fn) == MEMBER_REF);
3179 if (type_dependent_expression_p (fn)
3180 || any_type_dependent_arguments_p (args))
3181 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3183 /* Transform the arguments and add the implicit "this"
3184 parameter. That must be done before the FN is transformed
3185 because we depend on the form of FN. */
3186 args = build_non_dependent_args (args);
3187 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3188 object = build_unary_op (ADDR_EXPR, object, 0);
3189 object = build_non_dependent_expr (object);
3190 args = tree_cons (NULL_TREE, object, args);
3191 /* Now that the arguments are done, transform FN. */
3192 fn = build_non_dependent_expr (fn);
3195 /* A qualified name corresponding to a bound pointer-to-member is
3196 represented as an OFFSET_REF:
3198 struct B { void g(); };
3200 void B::g() { (this->*p)(); } */
3201 if (TREE_CODE (fn) == OFFSET_REF)
3203 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3204 fn = TREE_OPERAND (fn, 1);
3205 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3206 args = tree_cons (NULL_TREE, object_addr, args);
3209 expr = build_function_call (fn, args);
3210 if (processing_template_decl && expr != error_mark_node)
3211 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3217 check_default_args (tree x)
3219 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3220 bool saw_def = false;
3221 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3222 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3224 if (TREE_PURPOSE (arg))
3228 error ("default argument missing for parameter %P of %q+#D", i, x);
3229 TREE_PURPOSE (arg) = error_mark_node;
3234 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3235 If DECL is a specialization or implicitly declared class member,
3236 generate the actual definition. */
3239 mark_used (tree decl)
3241 HOST_WIDE_INT saved_processing_template_decl = 0;
3243 /* If DECL is a BASELINK for a single function, then treat it just
3244 like the DECL for the function. Otherwise, if the BASELINK is
3245 for an overloaded function, we don't know which function was
3246 actually used until after overload resolution. */
3247 if (TREE_CODE (decl) == BASELINK)
3249 decl = BASELINK_FUNCTIONS (decl);
3250 if (really_overloaded_fn (decl))
3252 decl = OVL_CURRENT (decl);
3255 TREE_USED (decl) = 1;
3256 /* If we don't need a value, then we don't need to synthesize DECL. */
3257 if (skip_evaluation)
3259 /* Normally, we can wait until instantiation-time to synthesize
3260 DECL. However, if DECL is a static data member initialized with
3261 a constant, we need the value right now because a reference to
3262 such a data member is not value-dependent. */
3263 if (TREE_CODE (decl) == VAR_DECL
3264 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3265 && DECL_CLASS_SCOPE_P (decl))
3267 /* Don't try to instantiate members of dependent types. We
3268 cannot just use dependent_type_p here because this function
3269 may be called from fold_non_dependent_expr, and then we may
3270 see dependent types, even though processing_template_decl
3272 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3273 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3275 /* Pretend that we are not in a template, even if we are, so
3276 that the static data member initializer will be processed. */
3277 saved_processing_template_decl = processing_template_decl;
3278 processing_template_decl = 0;
3281 if (processing_template_decl)
3284 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3285 && !TREE_ASM_WRITTEN (decl))
3286 /* Remember it, so we can check it was defined. */
3288 if (DECL_DEFERRED_FN (decl))
3291 /* Remember the current location for a function we will end up
3292 synthesizing. Then we can inform the user where it was
3293 required in the case of error. */
3294 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3295 && !DECL_THUNK_P (decl))
3296 DECL_SOURCE_LOCATION (decl) = input_location;
3298 note_vague_linkage_fn (decl);
3301 assemble_external (decl);
3303 /* Is it a synthesized method that needs to be synthesized? */
3304 if (TREE_CODE (decl) == FUNCTION_DECL
3305 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3306 && DECL_ARTIFICIAL (decl)
3307 && !DECL_THUNK_P (decl)
3308 && ! DECL_INITIAL (decl)
3309 /* Kludge: don't synthesize for default args. Unfortunately this
3310 rules out initializers of namespace-scoped objects too, but
3311 it's sort-of ok if the implicit ctor or dtor decl keeps
3312 pointing to the class location. */
3313 && current_function_decl)
3315 synthesize_method (decl);
3316 /* If we've already synthesized the method we don't need to
3317 do the instantiation test below. */
3319 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3320 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3321 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3322 || (TREE_CODE (decl) == FUNCTION_DECL
3323 && DECL_INLINE (DECL_TEMPLATE_RESULT
3324 (template_for_substitution (decl))))
3325 /* We need to instantiate static data members so that there
3326 initializers are available in integral constant
3328 || (TREE_CODE (decl) == VAR_DECL
3329 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3330 /* If this is a function or variable that is an instance of some
3331 template, we now know that we will need to actually do the
3332 instantiation. We check that DECL is not an explicit
3333 instantiation because that is not checked in instantiate_decl.
3335 We put off instantiating functions in order to improve compile
3336 times. Maintaining a stack of active functions is expensive,
3337 and the inliner knows to instantiate any functions it might
3338 need. Therefore, we always try to defer instantiation. */
3339 instantiate_decl (decl, /*defer_ok=*/true,
3340 /*expl_inst_class_mem_p=*/false);
3342 processing_template_decl = saved_processing_template_decl;
3345 #include "gt-cp-decl2.h"