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. */
723 /* current_class_type can be NULL_TREE in case of error. */
724 if (!asmspec_tree && current_class_type)
725 DECL_INITIAL (decl) = error_mark_node;
727 if (! processing_template_decl)
728 note_vague_linkage_var (decl);
730 if (LOCAL_CLASS_P (current_class_type))
731 pedwarn ("local class %q#T shall not have static data member %q#D",
732 current_class_type, decl);
734 /* Static consts need not be initialized in the class definition. */
735 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
737 static int explained = 0;
739 error ("initializer invalid for static member with constructor");
742 error ("(an out of class initialization is required)");
747 /* Force the compiler to know when an uninitialized static const
748 member is being used. */
749 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
750 TREE_USED (decl) = 1;
751 DECL_INITIAL (decl) = init;
752 DECL_IN_AGGR_P (decl) = 1;
754 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
757 /* DECLARATOR and DECLSPECS correspond to a class member. The other
758 parameters are as for cp_finish_decl. Return the DECL for the
759 class member declared. */
762 grokfield (const cp_declarator *declarator,
763 cp_decl_specifier_seq *declspecs,
764 tree init, bool init_const_expr_p,
769 const char *asmspec = 0;
770 int flags = LOOKUP_ONLYCONVERTING;
772 if (!declspecs->any_specifiers_p
773 && declarator->kind == cdk_id
774 && declarator->u.id.qualifying_scope
775 && TREE_CODE (declarator->u.id.unqualified_name) == IDENTIFIER_NODE)
776 /* Access declaration */
777 return do_class_using_decl (declarator->u.id.qualifying_scope,
778 declarator->u.id.unqualified_name);
781 && TREE_CODE (init) == TREE_LIST
782 && TREE_VALUE (init) == error_mark_node
783 && TREE_CHAIN (init) == NULL_TREE)
786 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
787 if (! value || error_operand_p (value))
788 /* friend or constructor went bad. */
789 return error_mark_node;
791 if (TREE_CODE (value) == TYPE_DECL && init)
793 error ("typedef %qD is initialized (use __typeof__ instead)", value);
797 /* Pass friendly classes back. */
798 if (value == void_type_node)
801 /* Pass friend decls back. */
802 if ((TREE_CODE (value) == FUNCTION_DECL
803 || TREE_CODE (value) == TEMPLATE_DECL)
804 && DECL_CONTEXT (value) != current_class_type)
807 if (DECL_NAME (value) != NULL_TREE
808 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
809 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
810 error ("member %qD conflicts with virtual function table field name",
813 /* Stash away type declarations. */
814 if (TREE_CODE (value) == TYPE_DECL)
816 DECL_NONLOCAL (value) = 1;
817 DECL_CONTEXT (value) = current_class_type;
819 if (processing_template_decl)
820 value = push_template_decl (value);
824 /* Avoid storing attributes in template parameters:
825 tsubst is not ready to handle them. */
826 tree type = TREE_TYPE (value);
827 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
828 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
829 sorry ("applying attributes to template parameters is not implemented");
831 cplus_decl_attributes (&value, attrlist, 0);
837 if (DECL_IN_AGGR_P (value))
839 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
840 return void_type_node;
844 asmspec = TREE_STRING_POINTER (asmspec_tree);
848 if (TREE_CODE (value) == FUNCTION_DECL)
850 /* Initializers for functions are rejected early in the parser.
851 If we get here, it must be a pure specifier for a method. */
852 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
854 gcc_assert (error_operand_p (init) || integer_zerop (init));
855 DECL_PURE_VIRTUAL_P (value) = 1;
859 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
860 error ("initializer specified for static member function %qD",
864 else if (pedantic && TREE_CODE (value) != VAR_DECL)
865 /* Already complained in grokdeclarator. */
867 else if (!processing_template_decl)
869 if (TREE_CODE (init) == CONSTRUCTOR)
870 init = digest_init (TREE_TYPE (value), init);
872 init = integral_constant_value (init);
874 if (init != error_mark_node && !TREE_CONSTANT (init))
876 /* We can allow references to things that are effectively
877 static, since references are initialized with the
879 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
880 || (TREE_STATIC (init) == 0
881 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
883 error ("field initializer is not constant");
884 init = error_mark_node;
890 if (processing_template_decl
891 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
893 value = push_template_decl (value);
894 if (error_operand_p (value))
895 return error_mark_node;
899 cplus_decl_attributes (&value, attrlist, 0);
901 switch (TREE_CODE (value))
904 finish_static_data_member_decl (value, init, init_const_expr_p,
905 asmspec_tree, flags);
910 error ("%<asm%> specifiers are not permitted on non-static data members");
911 if (DECL_INITIAL (value) == error_mark_node)
912 init = error_mark_node;
913 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
915 DECL_INITIAL (value) = init;
916 DECL_IN_AGGR_P (value) = 1;
921 set_user_assembler_name (value, asmspec);
923 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
924 asmspec_tree, flags);
926 /* Pass friends back this way. */
927 if (DECL_FRIEND_P (value))
928 return void_type_node;
930 DECL_IN_AGGR_P (value) = 1;
939 /* Like `grokfield', but for bitfields.
940 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
943 grokbitfield (const cp_declarator *declarator,
944 cp_decl_specifier_seq *declspecs, tree width)
946 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
948 if (! value) return NULL_TREE; /* friends went bad. */
950 /* Pass friendly classes back. */
951 if (TREE_CODE (value) == VOID_TYPE)
952 return void_type_node;
954 if (TREE_CODE (value) == TYPE_DECL)
956 error ("cannot declare %qD to be a bit-field type", value);
960 /* Usually, finish_struct_1 catches bitfields with invalid types.
961 But, in the case of bitfields with function type, we confuse
962 ourselves into thinking they are member functions, so we must
964 if (TREE_CODE (value) == FUNCTION_DECL)
966 error ("cannot declare bit-field %qD with function type",
971 if (DECL_IN_AGGR_P (value))
973 error ("%qD is already defined in the class %qT", value,
974 DECL_CONTEXT (value));
975 return void_type_node;
978 if (TREE_STATIC (value))
980 error ("static member %qD cannot be a bit-field", value);
983 finish_decl (value, NULL_TREE, NULL_TREE);
985 if (width != error_mark_node)
987 constant_expression_warning (width);
988 DECL_INITIAL (value) = width;
989 SET_DECL_C_BIT_FIELD (value);
992 DECL_IN_AGGR_P (value) = 1;
998 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1000 if (*decl == NULL_TREE || *decl == void_type_node)
1003 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1004 decl = &DECL_TEMPLATE_RESULT (*decl);
1006 decl_attributes (decl, attributes, flags);
1008 if (TREE_CODE (*decl) == TYPE_DECL)
1009 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1012 /* Walks through the namespace- or function-scope anonymous union
1013 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1014 Returns one of the fields for use in the mangled name. */
1017 build_anon_union_vars (tree type, tree object)
1019 tree main_decl = NULL_TREE;
1022 /* Rather than write the code to handle the non-union case,
1023 just give an error. */
1024 if (TREE_CODE (type) != UNION_TYPE)
1025 error ("anonymous struct not inside named type");
1027 for (field = TYPE_FIELDS (type);
1029 field = TREE_CHAIN (field))
1034 if (DECL_ARTIFICIAL (field))
1036 if (TREE_CODE (field) != FIELD_DECL)
1038 pedwarn ("%q+#D invalid; an anonymous union can only "
1039 "have non-static data members", field);
1043 if (TREE_PRIVATE (field))
1044 pedwarn ("private member %q+#D in anonymous union", field);
1045 else if (TREE_PROTECTED (field))
1046 pedwarn ("protected member %q+#D in anonymous union", field);
1048 if (processing_template_decl)
1049 ref = build_min_nt (COMPONENT_REF, object,
1050 DECL_NAME (field), NULL_TREE);
1052 ref = build_class_member_access_expr (object, field, NULL_TREE,
1055 if (DECL_NAME (field))
1059 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1061 base = get_base_address (object);
1062 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1063 TREE_STATIC (decl) = TREE_STATIC (base);
1064 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1066 SET_DECL_VALUE_EXPR (decl, ref);
1067 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1069 decl = pushdecl (decl);
1071 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1072 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1076 if (main_decl == NULL_TREE)
1083 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1084 anonymous union, then all members must be laid out together. PUBLIC_P
1085 is nonzero if this union is not declared static. */
1088 finish_anon_union (tree anon_union_decl)
1094 if (anon_union_decl == error_mark_node)
1097 type = TREE_TYPE (anon_union_decl);
1098 public_p = TREE_PUBLIC (anon_union_decl);
1100 /* The VAR_DECL's context is the same as the TYPE's context. */
1101 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1103 if (TYPE_FIELDS (type) == NULL_TREE)
1108 error ("namespace-scope anonymous aggregates must be static");
1112 main_decl = build_anon_union_vars (type, anon_union_decl);
1113 if (main_decl == NULL_TREE)
1115 warning (0, "anonymous union with no members");
1119 if (!processing_template_decl)
1121 /* Use main_decl to set the mangled name. */
1122 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1123 mangle_decl (anon_union_decl);
1124 DECL_NAME (anon_union_decl) = NULL_TREE;
1127 pushdecl (anon_union_decl);
1128 if (building_stmt_tree ()
1129 && at_function_scope_p ())
1130 add_decl_expr (anon_union_decl);
1131 else if (!processing_template_decl)
1132 rest_of_decl_compilation (anon_union_decl,
1133 toplevel_bindings_p (), at_eof);
1136 /* Auxiliary functions to make type signatures for
1137 `operator new' and `operator delete' correspond to
1138 what compiler will be expecting. */
1141 coerce_new_type (tree type)
1144 tree args = TYPE_ARG_TYPES (type);
1146 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1148 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1151 error ("%<operator new%> must return type %qT", ptr_type_node);
1154 if (!args || args == void_list_node
1155 || !same_type_p (TREE_VALUE (args), size_type_node))
1158 if (args && args != void_list_node)
1159 args = TREE_CHAIN (args);
1160 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1161 "as first parameter", size_type_node);
1166 args = tree_cons (NULL_TREE, size_type_node, args);
1169 type = build_exception_variant
1170 (build_function_type (ptr_type_node, args),
1171 TYPE_RAISES_EXCEPTIONS (type));
1179 coerce_delete_type (tree type)
1182 tree args = TYPE_ARG_TYPES (type);
1184 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1186 if (!same_type_p (TREE_TYPE (type), void_type_node))
1189 error ("%<operator delete%> must return type %qT", void_type_node);
1192 if (!args || args == void_list_node
1193 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1196 if (args && args != void_list_node)
1197 args = TREE_CHAIN (args);
1198 error ("%<operator delete%> takes type %qT as first parameter",
1204 args = tree_cons (NULL_TREE, ptr_type_node, args);
1207 type = build_exception_variant
1208 (build_function_type (void_type_node, args),
1209 TYPE_RAISES_EXCEPTIONS (type));
1218 mark_vtable_entries (tree decl)
1221 unsigned HOST_WIDE_INT idx;
1223 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1228 STRIP_NOPS (fnaddr);
1230 if (TREE_CODE (fnaddr) != ADDR_EXPR
1231 && TREE_CODE (fnaddr) != FDESC_EXPR)
1232 /* This entry is an offset: a virtual base class offset, a
1233 virtual call offset, an RTTI offset, etc. */
1236 fn = TREE_OPERAND (fnaddr, 0);
1237 TREE_ADDRESSABLE (fn) = 1;
1238 /* When we don't have vcall offsets, we output thunks whenever
1239 we output the vtables that contain them. With vcall offsets,
1240 we know all the thunks we'll need when we emit a virtual
1241 function, so we emit the thunks there instead. */
1242 if (DECL_THUNK_P (fn))
1243 use_thunk (fn, /*emit_p=*/0);
1248 /* Set DECL up to have the closest approximation of "initialized common"
1249 linkage available. */
1252 comdat_linkage (tree decl)
1255 make_decl_one_only (decl);
1256 else if (TREE_CODE (decl) == FUNCTION_DECL
1257 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1258 /* We can just emit function and compiler-generated variables
1259 statically; having multiple copies is (for the most part) only
1262 There are two correctness issues, however: the address of a
1263 template instantiation with external linkage should be the
1264 same, independent of what translation unit asks for the
1265 address, and this will not hold when we emit multiple copies of
1266 the function. However, there's little else we can do.
1268 Also, by default, the typeinfo implementation assumes that
1269 there will be only one copy of the string used as the name for
1270 each type. Therefore, if weak symbols are unavailable, the
1271 run-time library should perform a more conservative check; it
1272 should perform a string comparison, rather than an address
1274 TREE_PUBLIC (decl) = 0;
1277 /* Static data member template instantiations, however, cannot
1278 have multiple copies. */
1279 if (DECL_INITIAL (decl) == 0
1280 || DECL_INITIAL (decl) == error_mark_node)
1281 DECL_COMMON (decl) = 1;
1282 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1284 DECL_COMMON (decl) = 1;
1285 DECL_INITIAL (decl) = error_mark_node;
1287 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1289 /* We can't do anything useful; leave vars for explicit
1291 DECL_EXTERNAL (decl) = 1;
1292 DECL_NOT_REALLY_EXTERN (decl) = 0;
1296 if (DECL_LANG_SPECIFIC (decl))
1297 DECL_COMDAT (decl) = 1;
1300 /* For win32 we also want to put explicit instantiations in
1301 linkonce sections, so that they will be merged with implicit
1302 instantiations; otherwise we get duplicate symbol errors.
1303 For Darwin we do not want explicit instantiations to be
1307 maybe_make_one_only (tree decl)
1309 /* We used to say that this was not necessary on targets that support weak
1310 symbols, because the implicit instantiations will defer to the explicit
1311 one. However, that's not actually the case in SVR4; a strong definition
1312 after a weak one is an error. Also, not making explicit
1313 instantiations one_only means that we can end up with two copies of
1314 some template instantiations. */
1318 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1319 we can get away with not emitting them if they aren't used. We need
1320 to for variables so that cp_finish_decl will update their linkage,
1321 because their DECL_INITIAL may not have been set properly yet. */
1323 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1324 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1325 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1327 make_decl_one_only (decl);
1329 if (TREE_CODE (decl) == VAR_DECL)
1331 DECL_COMDAT (decl) = 1;
1332 /* Mark it needed so we don't forget to emit it. */
1333 mark_decl_referenced (decl);
1338 /* Determine whether or not we want to specifically import or export CTYPE,
1339 using various heuristics. */
1342 import_export_class (tree ctype)
1344 /* -1 for imported, 1 for exported. */
1345 int import_export = 0;
1347 /* It only makes sense to call this function at EOF. The reason is
1348 that this function looks at whether or not the first non-inline
1349 non-abstract virtual member function has been defined in this
1350 translation unit. But, we can't possibly know that until we've
1351 seen the entire translation unit. */
1352 gcc_assert (at_eof);
1354 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1357 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1358 we will have CLASSTYPE_INTERFACE_ONLY set but not
1359 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1360 heuristic because someone will supply a #pragma implementation
1361 elsewhere, and deducing it here would produce a conflict. */
1362 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1365 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1367 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1369 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1370 && !flag_implicit_templates)
1371 /* For a template class, without -fimplicit-templates, check the
1372 repository. If the virtual table is assigned to this
1373 translation unit, then export the class; otherwise, import
1375 import_export = repo_export_class_p (ctype) ? 1 : -1;
1376 else if (TYPE_POLYMORPHIC_P (ctype))
1378 /* The ABI specifies that the virtual table and associated
1379 information are emitted with the key method, if any. */
1380 tree method = CLASSTYPE_KEY_METHOD (ctype);
1381 /* If weak symbol support is not available, then we must be
1382 careful not to emit the vtable when the key function is
1383 inline. An inline function can be defined in multiple
1384 translation units. If we were to emit the vtable in each
1385 translation unit containing a definition, we would get
1386 multiple definition errors at link-time. */
1387 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1388 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1391 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1392 a definition anywhere else. */
1393 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1396 /* Allow backends the chance to overrule the decision. */
1397 if (targetm.cxx.import_export_class)
1398 import_export = targetm.cxx.import_export_class (ctype, import_export);
1402 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1403 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1407 /* Return true if VAR has already been provided to the back end; in that
1408 case VAR should not be modified further by the front end. */
1410 var_finalized_p (tree var)
1412 return cgraph_varpool_node (var)->finalized;
1415 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1416 must be emitted in this translation unit. Mark it as such. */
1419 mark_needed (tree decl)
1421 /* It's possible that we no longer need to set
1422 TREE_SYMBOL_REFERENCED here directly, but doing so is
1424 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1425 mark_decl_referenced (decl);
1428 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1429 returns true if a definition of this entity should be provided in
1430 this object file. Callers use this function to determine whether
1431 or not to let the back end know that a definition of DECL is
1432 available in this translation unit. */
1435 decl_needed_p (tree decl)
1437 gcc_assert (TREE_CODE (decl) == VAR_DECL
1438 || TREE_CODE (decl) == FUNCTION_DECL);
1439 /* This function should only be called at the end of the translation
1440 unit. We cannot be sure of whether or not something will be
1441 COMDAT until that point. */
1442 gcc_assert (at_eof);
1444 /* All entities with external linkage that are not COMDAT should be
1445 emitted; they may be referred to from other object files. */
1446 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1448 /* If this entity was used, let the back-end see it; it will decide
1449 whether or not to emit it into the object file. */
1450 if (TREE_USED (decl)
1451 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1452 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1454 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1455 reference to DECL might cause it to be emitted later. */
1459 /* If necessary, write out the vtables for the dynamic class CTYPE.
1460 Returns true if any vtables were emitted. */
1463 maybe_emit_vtables (tree ctype)
1469 /* If the vtables for this class have already been emitted there is
1470 nothing more to do. */
1471 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1472 if (var_finalized_p (primary_vtbl))
1474 /* Ignore dummy vtables made by get_vtable_decl. */
1475 if (TREE_TYPE (primary_vtbl) == void_type_node)
1478 /* On some targets, we cannot determine the key method until the end
1479 of the translation unit -- which is when this function is
1481 if (!targetm.cxx.key_method_may_be_inline ())
1482 determine_key_method (ctype);
1484 /* See if any of the vtables are needed. */
1485 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1487 import_export_decl (vtbl);
1488 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1493 /* If the references to this class' vtables are optimized away,
1494 still emit the appropriate debugging information. See
1496 if (DECL_COMDAT (primary_vtbl)
1497 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1498 note_debug_info_needed (ctype);
1502 /* The ABI requires that we emit all of the vtables if we emit any
1504 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1506 /* Mark entities references from the virtual table as used. */
1507 mark_vtable_entries (vtbl);
1509 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1511 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1513 /* It had better be all done at compile-time. */
1518 DECL_EXTERNAL (vtbl) = 0;
1519 rest_of_decl_compilation (vtbl, 1, 1);
1521 /* Because we're only doing syntax-checking, we'll never end up
1522 actually marking the variable as written. */
1523 if (flag_syntax_only)
1524 TREE_ASM_WRITTEN (vtbl) = 1;
1527 /* Since we're writing out the vtable here, also write the debug
1529 note_debug_info_needed (ctype);
1534 /* Like c_determine_visibility, but with additional C++-specific
1537 Function-scope entities can rely on the function's visibility because
1538 it is set in start_preparsed_function.
1540 Class-scope entities cannot rely on the class's visibility until the end
1541 of the enclosing class definition.
1543 Note that because namespaces have multiple independent definitions,
1544 namespace visibility is handled elsewhere using the #pragma visibility
1545 machinery rather than by decorating the namespace declaration. */
1548 determine_visibility (tree decl)
1552 /* Only relevant for names with external linkage. */
1553 if (!TREE_PUBLIC (decl))
1556 /* Cloned constructors and destructors get the same visibility as
1557 the underlying function. That should be set up in
1558 maybe_clone_body. */
1559 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1561 /* Give the common code a chance to make a determination. */
1562 if (c_determine_visibility (decl))
1565 /* If DECL is a member of a class, visibility specifiers on the
1566 class can influence the visibility of the DECL. */
1567 if (DECL_CLASS_SCOPE_P (decl))
1568 class_type = DECL_CONTEXT (decl);
1569 else if (TREE_CODE (decl) == VAR_DECL
1570 && DECL_TINFO_P (decl)
1571 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1572 class_type = TREE_TYPE (DECL_NAME (decl));
1575 /* Virtual tables have DECL_CONTEXT set to their associated class,
1576 so they are automatically handled above. */
1577 gcc_assert (TREE_CODE (decl) != VAR_DECL
1578 || !DECL_VTABLE_OR_VTT_P (decl));
1580 if (DECL_FUNCTION_SCOPE_P (decl))
1582 tree fn = DECL_CONTEXT (decl);
1583 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1584 DECL_VISIBILITY_SPECIFIED (decl) = DECL_VISIBILITY_SPECIFIED (fn);
1587 /* Entities not associated with any class just get the
1588 visibility specified by their attributes. */
1592 /* By default, static data members and function members receive
1593 the visibility of their containing class. */
1596 determine_visibility_from_class (decl, class_type);
1598 /* Give the target a chance to override the visibility associated
1600 if (TREE_CODE (decl) == VAR_DECL
1601 && (DECL_TINFO_P (decl)
1602 || (DECL_VTABLE_OR_VTT_P (decl)
1603 /* Construction virtual tables are not exported because
1604 they cannot be referred to from other object files;
1605 their name is not standardized by the ABI. */
1606 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1607 && TREE_PUBLIC (decl)
1608 && !DECL_REALLY_EXTERN (decl)
1609 && DECL_VISIBILITY_SPECIFIED (decl)
1610 && (!class_type || !CLASSTYPE_VISIBILITY_SPECIFIED (class_type)))
1611 targetm.cxx.determine_class_data_visibility (decl);
1616 determine_visibility_from_class (tree decl, tree class_type)
1618 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1619 && lookup_attribute ("dllexport", TYPE_ATTRIBUTES (class_type)))
1621 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1622 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1624 else if (TREE_CODE (decl) == FUNCTION_DECL
1625 && DECL_DECLARED_INLINE_P (decl)
1626 && visibility_options.inlines_hidden)
1628 /* Don't change it if it has been set explicitly by user. */
1629 if (!DECL_VISIBILITY_SPECIFIED (decl))
1631 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1632 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1635 else if (CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1637 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1638 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1640 else if (TYPE_CLASS_SCOPE_P (class_type))
1641 determine_visibility_from_class (decl, TYPE_CONTEXT (class_type));
1642 else if (TYPE_FUNCTION_SCOPE_P (class_type))
1644 tree fn = TYPE_CONTEXT (class_type);
1645 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1646 DECL_VISIBILITY_SPECIFIED (decl) = DECL_VISIBILITY_SPECIFIED (fn);
1648 else if (!DECL_VISIBILITY_SPECIFIED (decl))
1650 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1651 DECL_VISIBILITY_SPECIFIED (decl) = 0;
1655 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1656 for DECL has not already been determined, do so now by setting
1657 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1658 function is called entities with vague linkage whose definitions
1659 are available must have TREE_PUBLIC set.
1661 If this function decides to place DECL in COMDAT, it will set
1662 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1663 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1664 callers defer that decision until it is clear that DECL is actually
1668 import_export_decl (tree decl)
1673 tree class_type = NULL_TREE;
1675 if (DECL_INTERFACE_KNOWN (decl))
1678 /* We cannot determine what linkage to give to an entity with vague
1679 linkage until the end of the file. For example, a virtual table
1680 for a class will be defined if and only if the key method is
1681 defined in this translation unit. As a further example, consider
1682 that when compiling a translation unit that uses PCH file with
1683 "-frepo" it would be incorrect to make decisions about what
1684 entities to emit when building the PCH; those decisions must be
1685 delayed until the repository information has been processed. */
1686 gcc_assert (at_eof);
1687 /* Object file linkage for explicit instantiations is handled in
1688 mark_decl_instantiated. For static variables in functions with
1689 vague linkage, maybe_commonize_var is used.
1691 Therefore, the only declarations that should be provided to this
1692 function are those with external linkage that are:
1694 * implicit instantiations of function templates
1698 * implicit instantiations of static data members of class
1705 Furthermore, all entities that reach this point must have a
1706 definition available in this translation unit.
1708 The following assertions check these conditions. */
1709 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1710 || TREE_CODE (decl) == VAR_DECL);
1711 /* Any code that creates entities with TREE_PUBLIC cleared should
1712 also set DECL_INTERFACE_KNOWN. */
1713 gcc_assert (TREE_PUBLIC (decl));
1714 if (TREE_CODE (decl) == FUNCTION_DECL)
1715 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1716 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1717 || DECL_DECLARED_INLINE_P (decl));
1719 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1720 || DECL_VTABLE_OR_VTT_P (decl)
1721 || DECL_TINFO_P (decl));
1722 /* Check that a definition of DECL is available in this translation
1724 gcc_assert (!DECL_REALLY_EXTERN (decl));
1726 /* Assume that DECL will not have COMDAT linkage. */
1728 /* Assume that DECL will not be imported into this translation
1732 /* See if the repository tells us whether or not to emit DECL in
1733 this translation unit. */
1734 emit_p = repo_emit_p (decl);
1737 else if (emit_p == 1)
1739 /* The repository indicates that this entity should be defined
1740 here. Make sure the back end honors that request. */
1741 if (TREE_CODE (decl) == VAR_DECL)
1743 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1744 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1747 FOR_EACH_CLONE (clone, decl)
1748 mark_needed (clone);
1752 /* Output the definition as an ordinary strong definition. */
1753 DECL_EXTERNAL (decl) = 0;
1754 DECL_INTERFACE_KNOWN (decl) = 1;
1759 /* We have already decided what to do with this DECL; there is no
1760 need to check anything further. */
1762 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1764 class_type = DECL_CONTEXT (decl);
1765 import_export_class (class_type);
1766 if (TYPE_FOR_JAVA (class_type))
1768 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
1769 && CLASSTYPE_INTERFACE_ONLY (class_type))
1771 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
1772 && !CLASSTYPE_USE_TEMPLATE (class_type)
1773 && CLASSTYPE_KEY_METHOD (class_type)
1774 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
1775 /* The ABI requires that all virtual tables be emitted with
1776 COMDAT linkage. However, on systems where COMDAT symbols
1777 don't show up in the table of contents for a static
1778 archive, or on systems without weak symbols (where we
1779 approximate COMDAT linkage by using internal linkage), the
1780 linker will report errors about undefined symbols because
1781 it will not see the virtual table definition. Therefore,
1782 in the case that we know that the virtual table will be
1783 emitted in only one translation unit, we make the virtual
1784 table an ordinary definition with external linkage. */
1785 DECL_EXTERNAL (decl) = 0;
1786 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
1788 /* CLASS_TYPE is being exported from this translation unit,
1789 so DECL should be defined here. */
1790 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
1791 /* If a class is declared in a header with the "extern
1792 template" extension, then it will not be instantiated,
1793 even in translation units that would normally require
1794 it. Often such classes are explicitly instantiated in
1795 one translation unit. Therefore, the explicit
1796 instantiation must be made visible to other translation
1798 DECL_EXTERNAL (decl) = 0;
1801 /* The generic C++ ABI says that class data is always
1802 COMDAT, even if there is a key function. Some
1803 variants (e.g., the ARM EABI) says that class data
1804 only has COMDAT linkage if the class data might be
1805 emitted in more than one translation unit. When the
1806 key method can be inline and is inline, we still have
1807 to arrange for comdat even though
1808 class_data_always_comdat is false. */
1809 if (!CLASSTYPE_KEY_METHOD (class_type)
1810 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
1811 || targetm.cxx.class_data_always_comdat ())
1813 /* The ABI requires COMDAT linkage. Normally, we
1814 only emit COMDAT things when they are needed;
1815 make sure that we realize that this entity is
1822 else if (!flag_implicit_templates
1823 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
1828 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1830 tree type = TREE_TYPE (DECL_NAME (decl));
1831 if (CLASS_TYPE_P (type))
1834 import_export_class (type);
1835 if (CLASSTYPE_INTERFACE_KNOWN (type)
1836 && TYPE_POLYMORPHIC_P (type)
1837 && CLASSTYPE_INTERFACE_ONLY (type)
1838 /* If -fno-rtti was specified, then we cannot be sure
1839 that RTTI information will be emitted with the
1840 virtual table of the class, so we must emit it
1841 wherever it is used. */
1846 if (CLASSTYPE_INTERFACE_KNOWN (type)
1847 && !CLASSTYPE_INTERFACE_ONLY (type))
1849 comdat_p = (targetm.cxx.class_data_always_comdat ()
1850 || (CLASSTYPE_KEY_METHOD (type)
1851 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
1856 DECL_EXTERNAL (decl) = 0;
1866 else if (DECL_TEMPLATE_INSTANTIATION (decl)
1867 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1869 /* DECL is an implicit instantiation of a function or static
1871 if (flag_implicit_templates
1872 || (flag_implicit_inline_templates
1873 && TREE_CODE (decl) == FUNCTION_DECL
1874 && DECL_DECLARED_INLINE_P (decl)))
1877 /* If we are not implicitly generating templates, then mark
1878 this entity as undefined in this translation unit. */
1881 else if (DECL_FUNCTION_MEMBER_P (decl))
1883 if (!DECL_DECLARED_INLINE_P (decl))
1885 tree ctype = DECL_CONTEXT (decl);
1886 import_export_class (ctype);
1887 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1889 DECL_NOT_REALLY_EXTERN (decl)
1890 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
1891 || (DECL_DECLARED_INLINE_P (decl)
1892 && ! flag_implement_inlines
1893 && !DECL_VINDEX (decl)));
1895 if (!DECL_NOT_REALLY_EXTERN (decl))
1896 DECL_EXTERNAL (decl) = 1;
1898 /* Always make artificials weak. */
1899 if (DECL_ARTIFICIAL (decl) && flag_weak)
1902 maybe_make_one_only (decl);
1913 /* If we are importing DECL into this translation unit, mark is
1914 an undefined here. */
1915 DECL_EXTERNAL (decl) = 1;
1916 DECL_NOT_REALLY_EXTERN (decl) = 0;
1920 /* If we decided to put DECL in COMDAT, mark it accordingly at
1922 comdat_linkage (decl);
1925 DECL_INTERFACE_KNOWN (decl) = 1;
1928 /* Return an expression that performs the destruction of DECL, which
1929 must be a VAR_DECL whose type has a non-trivial destructor, or is
1930 an array whose (innermost) elements have a non-trivial destructor. */
1933 build_cleanup (tree decl)
1936 tree type = TREE_TYPE (decl);
1938 /* This function should only be called for declarations that really
1939 require cleanups. */
1940 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
1942 /* Treat all objects with destructors as used; the destructor may do
1943 something substantive. */
1946 if (TREE_CODE (type) == ARRAY_TYPE)
1950 cxx_mark_addressable (decl);
1951 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
1953 temp = build_delete (TREE_TYPE (temp), temp,
1954 sfk_complete_destructor,
1955 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
1959 /* Returns the initialization guard variable for the variable DECL,
1960 which has static storage duration. */
1963 get_guard (tree decl)
1968 sname = mangle_guard_variable (decl);
1969 guard = IDENTIFIER_GLOBAL_VALUE (sname);
1974 /* We use a type that is big enough to contain a mutex as well
1975 as an integer counter. */
1976 guard_type = targetm.cxx.guard_type ();
1977 guard = build_decl (VAR_DECL, sname, guard_type);
1979 /* The guard should have the same linkage as what it guards. */
1980 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
1981 TREE_STATIC (guard) = TREE_STATIC (decl);
1982 DECL_COMMON (guard) = DECL_COMMON (decl);
1983 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
1984 if (TREE_PUBLIC (decl))
1985 DECL_WEAK (guard) = DECL_WEAK (decl);
1987 DECL_ARTIFICIAL (guard) = 1;
1988 DECL_IGNORED_P (guard) = 1;
1989 TREE_USED (guard) = 1;
1990 pushdecl_top_level_and_finish (guard, NULL_TREE);
1995 /* Return those bits of the GUARD variable that should be set when the
1996 guarded entity is actually initialized. */
1999 get_guard_bits (tree guard)
2001 if (!targetm.cxx.guard_mask_bit ())
2003 /* We only set the first byte of the guard, in order to leave room
2004 for a mutex in the high-order bits. */
2005 guard = build1 (ADDR_EXPR,
2006 build_pointer_type (TREE_TYPE (guard)),
2008 guard = build1 (NOP_EXPR,
2009 build_pointer_type (char_type_node),
2011 guard = build1 (INDIRECT_REF, char_type_node, guard);
2017 /* Return an expression which determines whether or not the GUARD
2018 variable has already been initialized. */
2021 get_guard_cond (tree guard)
2025 /* Check to see if the GUARD is zero. */
2026 guard = get_guard_bits (guard);
2028 /* Mask off all but the low bit. */
2029 if (targetm.cxx.guard_mask_bit ())
2031 guard_value = integer_one_node;
2032 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2033 guard_value = convert (TREE_TYPE (guard), guard_value);
2034 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2037 guard_value = integer_zero_node;
2038 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2039 guard_value = convert (TREE_TYPE (guard), guard_value);
2040 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2043 /* Return an expression which sets the GUARD variable, indicating that
2044 the variable being guarded has been initialized. */
2047 set_guard (tree guard)
2051 /* Set the GUARD to one. */
2052 guard = get_guard_bits (guard);
2053 guard_init = integer_one_node;
2054 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2055 guard_init = convert (TREE_TYPE (guard), guard_init);
2056 return build_modify_expr (guard, NOP_EXPR, guard_init);
2059 /* Start the process of running a particular set of global constructors
2060 or destructors. Subroutine of do_[cd]tors. */
2063 start_objects (int method_type, int initp)
2069 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2071 if (initp != DEFAULT_INIT_PRIORITY)
2081 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2084 sprintf (type, "%c", method_type);
2086 fndecl = build_lang_decl (FUNCTION_DECL,
2087 get_file_function_name_long (type),
2088 build_function_type (void_type_node,
2090 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2092 /* It can be a static function as long as collect2 does not have
2093 to scan the object file to find its ctor/dtor routine. */
2094 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2096 /* Mark this declaration as used to avoid spurious warnings. */
2097 TREE_USED (current_function_decl) = 1;
2099 /* Mark this function as a global constructor or destructor. */
2100 if (method_type == 'I')
2101 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2103 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2104 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2106 body = begin_compound_stmt (BCS_FN_BODY);
2108 /* We cannot allow these functions to be elided, even if they do not
2109 have external linkage. And, there's no point in deferring
2110 compilation of thes functions; they're all going to have to be
2112 DECL_INLINE (current_function_decl) = 0;
2113 DECL_UNINLINABLE (current_function_decl) = 1;
2118 /* Finish the process of running a particular set of global constructors
2119 or destructors. Subroutine of do_[cd]tors. */
2122 finish_objects (int method_type, int initp, tree body)
2127 finish_compound_stmt (body);
2128 fn = finish_function (0);
2129 expand_or_defer_fn (fn);
2131 /* When only doing semantic analysis, and no RTL generation, we
2132 can't call functions that directly emit assembly code; there is
2133 no assembly file in which to put the code. */
2134 if (flag_syntax_only)
2137 if (targetm.have_ctors_dtors)
2139 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2140 cgraph_mark_needed_node (cgraph_node (fn));
2141 if (method_type == 'I')
2142 (* targetm.asm_out.constructor) (fnsym, initp);
2144 (* targetm.asm_out.destructor) (fnsym, initp);
2148 /* The names of the parameters to the function created to handle
2149 initializations and destructions for objects with static storage
2151 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2152 #define PRIORITY_IDENTIFIER "__priority"
2154 /* The name of the function we create to handle initializations and
2155 destructions for objects with static storage duration. */
2156 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2158 /* The declaration for the __INITIALIZE_P argument. */
2159 static GTY(()) tree initialize_p_decl;
2161 /* The declaration for the __PRIORITY argument. */
2162 static GTY(()) tree priority_decl;
2164 /* The declaration for the static storage duration function. */
2165 static GTY(()) tree ssdf_decl;
2167 /* All the static storage duration functions created in this
2168 translation unit. */
2169 static GTY(()) VEC(tree,gc) *ssdf_decls;
2171 /* A map from priority levels to information about that priority
2172 level. There may be many such levels, so efficient lookup is
2174 static splay_tree priority_info_map;
2176 /* Begins the generation of the function that will handle all
2177 initialization and destruction of objects with static storage
2178 duration. The function generated takes two parameters of type
2179 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2180 nonzero, it performs initializations. Otherwise, it performs
2181 destructions. It only performs those initializations or
2182 destructions with the indicated __PRIORITY. The generated function
2185 It is assumed that this function will only be called once per
2186 translation unit. */
2189 start_static_storage_duration_function (unsigned count)
2194 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2196 /* Create the identifier for this function. It will be of the form
2197 SSDF_IDENTIFIER_<number>. */
2198 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2200 /* Create the parameters. */
2201 parm_types = void_list_node;
2202 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2203 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2204 type = build_function_type (void_type_node, parm_types);
2206 /* Create the FUNCTION_DECL itself. */
2207 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2208 get_identifier (id),
2210 TREE_PUBLIC (ssdf_decl) = 0;
2211 DECL_ARTIFICIAL (ssdf_decl) = 1;
2213 /* Put this function in the list of functions to be called from the
2214 static constructors and destructors. */
2217 ssdf_decls = VEC_alloc (tree, gc, 32);
2219 /* Take this opportunity to initialize the map from priority
2220 numbers to information about that priority level. */
2221 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2222 /*delete_key_fn=*/0,
2223 /*delete_value_fn=*/
2224 (splay_tree_delete_value_fn) &free);
2226 /* We always need to generate functions for the
2227 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2228 priorities later, we'll be sure to find the
2229 DEFAULT_INIT_PRIORITY. */
2230 get_priority_info (DEFAULT_INIT_PRIORITY);
2233 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2235 /* Create the argument list. */
2236 initialize_p_decl = cp_build_parm_decl
2237 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2238 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2239 TREE_USED (initialize_p_decl) = 1;
2240 priority_decl = cp_build_parm_decl
2241 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2242 DECL_CONTEXT (priority_decl) = ssdf_decl;
2243 TREE_USED (priority_decl) = 1;
2245 TREE_CHAIN (initialize_p_decl) = priority_decl;
2246 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2248 /* Put the function in the global scope. */
2249 pushdecl (ssdf_decl);
2251 /* Start the function itself. This is equivalent to declaring the
2254 static void __ssdf (int __initialize_p, init __priority_p);
2256 It is static because we only need to call this function from the
2257 various constructor and destructor functions for this module. */
2258 start_preparsed_function (ssdf_decl,
2259 /*attrs=*/NULL_TREE,
2262 /* Set up the scope of the outermost block in the function. */
2263 body = begin_compound_stmt (BCS_FN_BODY);
2265 /* This function must not be deferred because we are depending on
2266 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2267 DECL_INLINE (ssdf_decl) = 0;
2268 DECL_UNINLINABLE (ssdf_decl) = 1;
2273 /* Finish the generation of the function which performs initialization
2274 and destruction of objects with static storage duration. After
2275 this point, no more such objects can be created. */
2278 finish_static_storage_duration_function (tree body)
2280 /* Close out the function. */
2281 finish_compound_stmt (body);
2282 expand_or_defer_fn (finish_function (0));
2285 /* Return the information about the indicated PRIORITY level. If no
2286 code to handle this level has yet been generated, generate the
2287 appropriate prologue. */
2289 static priority_info
2290 get_priority_info (int priority)
2295 n = splay_tree_lookup (priority_info_map,
2296 (splay_tree_key) priority);
2299 /* Create a new priority information structure, and insert it
2301 pi = XNEW (struct priority_info_s);
2302 pi->initializations_p = 0;
2303 pi->destructions_p = 0;
2304 splay_tree_insert (priority_info_map,
2305 (splay_tree_key) priority,
2306 (splay_tree_value) pi);
2309 pi = (priority_info) n->value;
2314 /* The effective initialization priority of a DECL. */
2316 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2317 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2318 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2320 /* Whether a DECL needs a guard to protect it against multiple
2323 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2324 || DECL_ONE_ONLY (decl) \
2325 || DECL_WEAK (decl)))
2327 /* Set up to handle the initialization or destruction of DECL. If
2328 INITP is nonzero, we are initializing the variable. Otherwise, we
2329 are destroying it. */
2332 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2334 tree guard_if_stmt = NULL_TREE;
2337 /* If we are supposed to destruct and there's a trivial destructor,
2338 nothing has to be done. */
2340 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2343 /* Trick the compiler into thinking we are at the file and line
2344 where DECL was declared so that error-messages make sense, and so
2345 that the debugger will show somewhat sensible file and line
2347 input_location = DECL_SOURCE_LOCATION (decl);
2353 Access control for implicit calls to the constructors,
2354 the conversion functions, or the destructor called to
2355 create and destroy a static data member is performed as
2356 if these calls appeared in the scope of the member's
2359 we pretend we are in a static member function of the class of
2360 which the DECL is a member. */
2361 if (member_p (decl))
2363 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2364 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2367 /* Assume we don't need a guard. */
2369 /* We need a guard if this is an object with external linkage that
2370 might be initialized in more than one place. (For example, a
2371 static data member of a template, when the data member requires
2373 if (NEEDS_GUARD_P (decl))
2377 guard = get_guard (decl);
2379 /* When using __cxa_atexit, we just check the GUARD as we would
2380 for a local static. */
2381 if (flag_use_cxa_atexit)
2383 /* When using __cxa_atexit, we never try to destroy
2384 anything from a static destructor. */
2386 guard_cond = get_guard_cond (guard);
2388 /* If we don't have __cxa_atexit, then we will be running
2389 destructors from .fini sections, or their equivalents. So,
2390 we need to know how many times we've tried to initialize this
2391 object. We do initializations only if the GUARD is zero,
2392 i.e., if we are the first to initialize the variable. We do
2393 destructions only if the GUARD is one, i.e., if we are the
2394 last to destroy the variable. */
2397 = cp_build_binary_op (EQ_EXPR,
2398 build_unary_op (PREINCREMENT_EXPR,
2404 = cp_build_binary_op (EQ_EXPR,
2405 build_unary_op (PREDECREMENT_EXPR,
2410 guard_if_stmt = begin_if_stmt ();
2411 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2415 /* If we're using __cxa_atexit, we have not already set the GUARD,
2416 so we must do so now. */
2417 if (guard && initp && flag_use_cxa_atexit)
2418 finish_expr_stmt (set_guard (guard));
2420 /* Perform the initialization or destruction. */
2424 finish_expr_stmt (init);
2426 /* If we're using __cxa_atexit, register a function that calls the
2427 destructor for the object. */
2428 if (flag_use_cxa_atexit)
2429 finish_expr_stmt (register_dtor_fn (decl));
2432 finish_expr_stmt (build_cleanup (decl));
2434 /* Finish the guard if-stmt, if necessary. */
2437 finish_then_clause (guard_if_stmt);
2438 finish_if_stmt (guard_if_stmt);
2441 /* Now that we're done with DECL we don't need to pretend to be a
2442 member of its class any longer. */
2443 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2444 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2447 /* Generate code to do the initialization or destruction of the decls in VARS,
2448 a TREE_LIST of VAR_DECL with static storage duration.
2449 Whether initialization or destruction is performed is specified by INITP. */
2452 do_static_initialization_or_destruction (tree vars, bool initp)
2454 tree node, init_if_stmt, cond;
2456 /* Build the outer if-stmt to check for initialization or destruction. */
2457 init_if_stmt = begin_if_stmt ();
2458 cond = initp ? integer_one_node : integer_zero_node;
2459 cond = cp_build_binary_op (EQ_EXPR,
2462 finish_if_stmt_cond (cond, init_if_stmt);
2466 tree decl = TREE_VALUE (node);
2467 tree priority_if_stmt;
2471 /* If we don't need a destructor, there's nothing to do. Avoid
2472 creating a possibly empty if-stmt. */
2473 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2475 node = TREE_CHAIN (node);
2479 /* Remember that we had an initialization or finalization at this
2481 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2482 pi = get_priority_info (priority);
2484 pi->initializations_p = 1;
2486 pi->destructions_p = 1;
2488 /* Conditionalize this initialization on being in the right priority
2489 and being initializing/finalizing appropriately. */
2490 priority_if_stmt = begin_if_stmt ();
2491 cond = cp_build_binary_op (EQ_EXPR,
2493 build_int_cst (NULL_TREE, priority));
2494 finish_if_stmt_cond (cond, priority_if_stmt);
2496 /* Process initializers with same priority. */
2498 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2499 node = TREE_CHAIN (node))
2500 /* Do one initialization or destruction. */
2501 one_static_initialization_or_destruction (TREE_VALUE (node),
2502 TREE_PURPOSE (node), initp);
2504 /* Finish up the priority if-stmt body. */
2505 finish_then_clause (priority_if_stmt);
2506 finish_if_stmt (priority_if_stmt);
2510 /* Finish up the init/destruct if-stmt body. */
2511 finish_then_clause (init_if_stmt);
2512 finish_if_stmt (init_if_stmt);
2515 /* VARS is a list of variables with static storage duration which may
2516 need initialization and/or finalization. Remove those variables
2517 that don't really need to be initialized or finalized, and return
2518 the resulting list. The order in which the variables appear in
2519 VARS is in reverse order of the order in which they should actually
2520 be initialized. The list we return is in the unreversed order;
2521 i.e., the first variable should be initialized first. */
2524 prune_vars_needing_no_initialization (tree *vars)
2527 tree result = NULL_TREE;
2532 tree decl = TREE_VALUE (t);
2533 tree init = TREE_PURPOSE (t);
2535 /* Deal gracefully with error. */
2536 if (decl == error_mark_node)
2538 var = &TREE_CHAIN (t);
2542 /* The only things that can be initialized are variables. */
2543 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2545 /* If this object is not defined, we don't need to do anything
2547 if (DECL_EXTERNAL (decl))
2549 var = &TREE_CHAIN (t);
2553 /* Also, if the initializer already contains errors, we can bail
2555 if (init && TREE_CODE (init) == TREE_LIST
2556 && value_member (error_mark_node, init))
2558 var = &TREE_CHAIN (t);
2562 /* This variable is going to need initialization and/or
2563 finalization, so we add it to the list. */
2564 *var = TREE_CHAIN (t);
2565 TREE_CHAIN (t) = result;
2572 /* Make sure we have told the back end about all the variables in
2576 write_out_vars (tree vars)
2580 for (v = vars; v; v = TREE_CHAIN (v))
2582 tree var = TREE_VALUE (v);
2583 if (!var_finalized_p (var))
2585 import_export_decl (var);
2586 rest_of_decl_compilation (var, 1, 1);
2591 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2592 (otherwise) that will initialize all gobal objects with static
2593 storage duration having the indicated PRIORITY. */
2596 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2605 input_location = *locus;
2606 #ifdef USE_MAPPED_LOCATION
2612 /* We use `I' to indicate initialization and `D' to indicate
2614 function_key = constructor_p ? 'I' : 'D';
2616 /* We emit the function lazily, to avoid generating empty
2617 global constructors and destructors. */
2620 /* For Objective-C++, we may need to initialize metadata found in this module.
2621 This must be done _before_ any other static initializations. */
2622 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2623 && constructor_p && objc_static_init_needed_p ())
2625 body = start_objects (function_key, priority);
2626 static_ctors = objc_generate_static_init_call (static_ctors);
2629 /* Call the static storage duration function with appropriate
2631 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2633 /* Calls to pure or const functions will expand to nothing. */
2634 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2637 body = start_objects (function_key, priority);
2639 arguments = tree_cons (NULL_TREE,
2640 build_int_cst (NULL_TREE, priority),
2642 arguments = tree_cons (NULL_TREE,
2643 build_int_cst (NULL_TREE, constructor_p),
2645 finish_expr_stmt (build_function_call (fndecl, arguments));
2649 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2650 calls to any functions marked with attributes indicating that
2651 they should be called at initialization- or destruction-time. */
2652 if (priority == DEFAULT_INIT_PRIORITY)
2656 for (fns = constructor_p ? static_ctors : static_dtors;
2658 fns = TREE_CHAIN (fns))
2660 fndecl = TREE_VALUE (fns);
2662 /* Calls to pure/const functions will expand to nothing. */
2663 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2666 body = start_objects (function_key, priority);
2667 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2672 /* Close out the function. */
2674 finish_objects (function_key, priority, body);
2677 /* Generate constructor and destructor functions for the priority
2681 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2683 location_t *locus = (location_t *) data;
2684 int priority = (int) n->key;
2685 priority_info pi = (priority_info) n->value;
2687 /* Generate the functions themselves, but only if they are really
2689 if (pi->initializations_p
2690 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2691 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2692 if (pi->destructions_p
2693 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2694 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2696 /* Keep iterating. */
2700 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2701 decls referenced from frontend specific constructs; it will be called
2702 only for language-specific tree nodes.
2704 Here we must deal with member pointers. */
2707 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2708 tree from ATTRIBUTE_UNUSED)
2712 switch (TREE_CODE (t))
2715 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2716 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2719 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2720 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2723 if (DECL_VTABLE_OR_VTT_P (t))
2725 /* The ABI requires that all virtual tables be emitted
2726 whenever one of them is. */
2728 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2730 vtbl = TREE_CHAIN (vtbl))
2731 mark_decl_referenced (vtbl);
2733 else if (DECL_CONTEXT (t)
2734 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2735 /* If we need a static variable in a function, then we
2736 need the containing function. */
2737 mark_decl_referenced (DECL_CONTEXT (t));
2746 /* Java requires that we be able to reference a local address for a
2747 method, and not be confused by PLT entries. If hidden aliases are
2748 supported, emit one for each java function that we've emitted. */
2751 build_java_method_aliases (void)
2753 struct cgraph_node *node;
2755 #ifndef HAVE_GAS_HIDDEN
2759 for (node = cgraph_nodes; node ; node = node->next)
2761 tree fndecl = node->decl;
2763 if (TREE_ASM_WRITTEN (fndecl)
2764 && DECL_CONTEXT (fndecl)
2765 && TYPE_P (DECL_CONTEXT (fndecl))
2766 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2767 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
2769 /* Mangle the name in a predictable way; we need to reference
2770 this from a java compiled object file. */
2771 tree oid, nid, alias;
2775 oid = DECL_ASSEMBLER_NAME (fndecl);
2776 oname = IDENTIFIER_POINTER (oid);
2777 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
2778 nname = ACONCAT (("_ZGA", oname+2, NULL));
2779 nid = get_identifier (nname);
2781 alias = make_alias_for (fndecl, nid);
2782 TREE_PUBLIC (alias) = 1;
2783 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
2785 assemble_alias (alias, oid);
2790 /* This routine is called from the last rule in yyparse ().
2791 Its job is to create all the code needed to initialize and
2792 destroy the global aggregates. We do the destruction
2793 first, since that way we only need to reverse the decls once. */
2796 cp_finish_file (void)
2802 unsigned ssdf_count = 0;
2806 locus = input_location;
2809 /* Bad parse errors. Just forget about it. */
2810 if (! global_bindings_p () || current_class_type || decl_namespace_list)
2814 c_common_write_pch ();
2816 #ifdef USE_MAPPED_LOCATION
2819 /* Otherwise, GDB can get confused, because in only knows
2820 about source for LINENO-1 lines. */
2824 /* We now have to write out all the stuff we put off writing out.
2827 o Template specializations that we have not yet instantiated,
2828 but which are needed.
2829 o Initialization and destruction for non-local objects with
2830 static storage duration. (Local objects with static storage
2831 duration are initialized when their scope is first entered,
2832 and are cleaned up via atexit.)
2833 o Virtual function tables.
2835 All of these may cause others to be needed. For example,
2836 instantiating one function may cause another to be needed, and
2837 generating the initializer for an object may cause templates to be
2838 instantiated, etc., etc. */
2840 timevar_push (TV_VARCONST);
2842 emit_support_tinfos ();
2851 /* If there are templates that we've put off instantiating, do
2853 instantiate_pending_templates (retries);
2856 /* Write out virtual tables as required. Note that writing out
2857 the virtual table for a template class may cause the
2858 instantiation of members of that class. If we write out
2859 vtables then we remove the class from our list so we don't
2860 have to look at it again. */
2862 while (keyed_classes != NULL_TREE
2863 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
2866 keyed_classes = TREE_CHAIN (keyed_classes);
2872 tree next = TREE_CHAIN (t);
2876 if (maybe_emit_vtables (TREE_VALUE (next)))
2879 TREE_CHAIN (t) = TREE_CHAIN (next);
2884 next = TREE_CHAIN (t);
2888 /* Write out needed type info variables. We have to be careful
2889 looping through unemitted decls, because emit_tinfo_decl may
2890 cause other variables to be needed. New elements will be
2891 appended, and we remove from the vector those that actually
2893 for (i = VEC_length (tree, unemitted_tinfo_decls);
2894 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
2895 if (emit_tinfo_decl (t))
2898 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
2901 /* The list of objects with static storage duration is built up
2902 in reverse order. We clear STATIC_AGGREGATES so that any new
2903 aggregates added during the initialization of these will be
2904 initialized in the correct order when we next come around the
2906 vars = prune_vars_needing_no_initialization (&static_aggregates);
2910 /* We need to start a new initialization function each time
2911 through the loop. That's because we need to know which
2912 vtables have been referenced, and TREE_SYMBOL_REFERENCED
2913 isn't computed until a function is finished, and written
2914 out. That's a deficiency in the back-end. When this is
2915 fixed, these initialization functions could all become
2916 inline, with resulting performance improvements. */
2919 /* Set the line and file, so that it is obviously not from
2921 input_location = locus;
2922 ssdf_body = start_static_storage_duration_function (ssdf_count);
2924 /* Make sure the back end knows about all the variables. */
2925 write_out_vars (vars);
2927 /* First generate code to do all the initializations. */
2929 do_static_initialization_or_destruction (vars, /*initp=*/true);
2931 /* Then, generate code to do all the destructions. Do these
2932 in reverse order so that the most recently constructed
2933 variable is the first destroyed. If we're using
2934 __cxa_atexit, then we don't need to do this; functions
2935 were registered at initialization time to destroy the
2937 if (!flag_use_cxa_atexit && vars)
2939 vars = nreverse (vars);
2940 do_static_initialization_or_destruction (vars, /*initp=*/false);
2945 /* Finish up the static storage duration function for this
2947 input_location = locus;
2948 finish_static_storage_duration_function (ssdf_body);
2950 /* All those initializations and finalizations might cause
2951 us to need more inline functions, more template
2952 instantiations, etc. */
2955 #ifdef USE_MAPPED_LOCATION
2962 /* Go through the set of inline functions whose bodies have not
2963 been emitted yet. If out-of-line copies of these functions
2964 are required, emit them. */
2965 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
2967 /* Does it need synthesizing? */
2968 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
2969 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
2971 /* Even though we're already at the top-level, we push
2972 there again. That way, when we pop back a few lines
2973 hence, all of our state is restored. Otherwise,
2974 finish_function doesn't clean things up, and we end
2975 up with CURRENT_FUNCTION_DECL set. */
2976 push_to_top_level ();
2977 /* The decl's location will mark where it was first
2978 needed. Save that so synthesize method can indicate
2979 where it was needed from, in case of error */
2980 input_location = DECL_SOURCE_LOCATION (decl);
2981 synthesize_method (decl);
2982 pop_from_top_level ();
2986 if (!DECL_SAVED_TREE (decl))
2989 /* We lie to the back-end, pretending that some functions
2990 are not defined when they really are. This keeps these
2991 functions from being put out unnecessarily. But, we must
2992 stop lying when the functions are referenced, or if they
2993 are not comdat since they need to be put out now. If
2994 DECL_INTERFACE_KNOWN, then we have already set
2995 DECL_EXTERNAL appropriately, so there's no need to check
2996 again, and we do not want to clear DECL_EXTERNAL if a
2997 previous call to import_export_decl set it.
2999 This is done in a separate for cycle, because if some
3000 deferred function is contained in another deferred
3001 function later in deferred_fns varray,
3002 rest_of_compilation would skip this function and we
3003 really cannot expand the same function twice. */
3004 import_export_decl (decl);
3005 if (DECL_NOT_REALLY_EXTERN (decl)
3006 && DECL_INITIAL (decl)
3007 && decl_needed_p (decl))
3008 DECL_EXTERNAL (decl) = 0;
3010 /* If we're going to need to write this function out, and
3011 there's already a body for it, create RTL for it now.
3012 (There might be no body if this is a method we haven't
3013 gotten around to synthesizing yet.) */
3014 if (!DECL_EXTERNAL (decl)
3015 && decl_needed_p (decl)
3016 && !TREE_ASM_WRITTEN (decl)
3017 && !cgraph_node (decl)->local.finalized)
3019 /* We will output the function; no longer consider it in this
3021 DECL_DEFER_OUTPUT (decl) = 0;
3022 /* Generate RTL for this function now that we know we
3024 expand_or_defer_fn (decl);
3025 /* If we're compiling -fsyntax-only pretend that this
3026 function has been written out so that we don't try to
3028 if (flag_syntax_only)
3029 TREE_ASM_WRITTEN (decl) = 1;
3034 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3037 /* Static data members are just like namespace-scope globals. */
3038 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3040 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3042 import_export_decl (decl);
3043 /* If this static data member is needed, provide it to the
3045 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3046 DECL_EXTERNAL (decl) = 0;
3048 if (VEC_length (tree, pending_statics) != 0
3049 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3050 VEC_length (tree, pending_statics)))
3057 /* All used inline functions must have a definition at this point. */
3058 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3060 if (/* Check online inline functions that were actually used. */
3061 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3062 /* If the definition actually was available here, then the
3063 fact that the function was not defined merely represents
3064 that for some reason (use of a template repository,
3065 #pragma interface, etc.) we decided not to emit the
3067 && !DECL_INITIAL (decl)
3068 /* An explicit instantiation can be used to specify
3069 that the body is in another unit. It will have
3070 already verified there was a definition. */
3071 && !DECL_EXPLICIT_INSTANTIATION (decl))
3073 warning (0, "inline function %q+D used but never defined", decl);
3074 /* Avoid a duplicate warning from check_global_declaration_1. */
3075 TREE_NO_WARNING (decl) = 1;
3079 /* We give C linkage to static constructors and destructors. */
3080 push_lang_context (lang_name_c);
3082 /* Generate initialization and destruction functions for all
3083 priorities for which they are required. */
3084 if (priority_info_map)
3085 splay_tree_foreach (priority_info_map,
3086 generate_ctor_and_dtor_functions_for_priority,
3090 /* If we have a ctor or this is obj-c++ and we need a static init,
3091 call generate_ctor_or_dtor_function. */
3092 if (static_ctors || (c_dialect_objc () && objc_static_init_needed_p ()))
3093 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3094 DEFAULT_INIT_PRIORITY, &locus);
3096 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3097 DEFAULT_INIT_PRIORITY, &locus);
3100 /* We're done with the splay-tree now. */
3101 if (priority_info_map)
3102 splay_tree_delete (priority_info_map);
3104 /* Generate any missing aliases. */
3105 maybe_apply_pending_pragma_weaks ();
3107 /* We're done with static constructors, so we can go back to "C++"
3109 pop_lang_context ();
3111 cgraph_finalize_compilation_unit ();
3114 /* Now, issue warnings about static, but not defined, functions,
3115 etc., and emit debugging information. */
3116 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3117 if (VEC_length (tree, pending_statics) != 0)
3119 check_global_declarations (VEC_address (tree, pending_statics),
3120 VEC_length (tree, pending_statics));
3121 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3122 VEC_length (tree, pending_statics));
3125 /* Generate hidden aliases for Java. */
3126 build_java_method_aliases ();
3130 /* The entire file is now complete. If requested, dump everything
3134 FILE *stream = dump_begin (TDI_tu, &flags);
3138 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3139 dump_end (TDI_tu, stream);
3143 timevar_pop (TV_VARCONST);
3145 if (flag_detailed_statistics)
3147 dump_tree_statistics ();
3148 dump_time_statistics ();
3150 input_location = locus;
3152 #ifdef ENABLE_CHECKING
3153 validate_conversion_obstack ();
3154 #endif /* ENABLE_CHECKING */
3157 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3158 function to call in parse-tree form; it has not yet been
3159 semantically analyzed. ARGS are the arguments to the function.
3160 They have already been semantically analyzed. */
3163 build_offset_ref_call_from_tree (tree fn, tree args)
3172 object = TREE_OPERAND (fn, 0);
3174 if (processing_template_decl)
3176 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3177 || TREE_CODE (fn) == MEMBER_REF);
3178 if (type_dependent_expression_p (fn)
3179 || any_type_dependent_arguments_p (args))
3180 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3182 /* Transform the arguments and add the implicit "this"
3183 parameter. That must be done before the FN is transformed
3184 because we depend on the form of FN. */
3185 args = build_non_dependent_args (args);
3186 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3187 object = build_unary_op (ADDR_EXPR, object, 0);
3188 object = build_non_dependent_expr (object);
3189 args = tree_cons (NULL_TREE, object, args);
3190 /* Now that the arguments are done, transform FN. */
3191 fn = build_non_dependent_expr (fn);
3194 /* A qualified name corresponding to a bound pointer-to-member is
3195 represented as an OFFSET_REF:
3197 struct B { void g(); };
3199 void B::g() { (this->*p)(); } */
3200 if (TREE_CODE (fn) == OFFSET_REF)
3202 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3203 fn = TREE_OPERAND (fn, 1);
3204 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3205 args = tree_cons (NULL_TREE, object_addr, args);
3208 expr = build_function_call (fn, args);
3209 if (processing_template_decl && expr != error_mark_node)
3210 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3216 check_default_args (tree x)
3218 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3219 bool saw_def = false;
3220 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3221 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3223 if (TREE_PURPOSE (arg))
3227 error ("default argument missing for parameter %P of %q+#D", i, x);
3228 TREE_PURPOSE (arg) = error_mark_node;
3233 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3234 If DECL is a specialization or implicitly declared class member,
3235 generate the actual definition. */
3238 mark_used (tree decl)
3240 HOST_WIDE_INT saved_processing_template_decl = 0;
3242 /* If DECL is a BASELINK for a single function, then treat it just
3243 like the DECL for the function. Otherwise, if the BASELINK is
3244 for an overloaded function, we don't know which function was
3245 actually used until after overload resolution. */
3246 if (TREE_CODE (decl) == BASELINK)
3248 decl = BASELINK_FUNCTIONS (decl);
3249 if (really_overloaded_fn (decl))
3251 decl = OVL_CURRENT (decl);
3254 TREE_USED (decl) = 1;
3255 /* If we don't need a value, then we don't need to synthesize DECL. */
3256 if (skip_evaluation)
3258 /* Normally, we can wait until instantiation-time to synthesize
3259 DECL. However, if DECL is a static data member initialized with
3260 a constant, we need the value right now because a reference to
3261 such a data member is not value-dependent. */
3262 if (TREE_CODE (decl) == VAR_DECL
3263 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3264 && DECL_CLASS_SCOPE_P (decl))
3266 /* Don't try to instantiate members of dependent types. We
3267 cannot just use dependent_type_p here because this function
3268 may be called from fold_non_dependent_expr, and then we may
3269 see dependent types, even though processing_template_decl
3271 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3272 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3274 /* Pretend that we are not in a template, even if we are, so
3275 that the static data member initializer will be processed. */
3276 saved_processing_template_decl = processing_template_decl;
3277 processing_template_decl = 0;
3280 if (processing_template_decl)
3283 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3284 && !TREE_ASM_WRITTEN (decl))
3285 /* Remember it, so we can check it was defined. */
3287 if (DECL_DEFERRED_FN (decl))
3290 /* Remember the current location for a function we will end up
3291 synthesizing. Then we can inform the user where it was
3292 required in the case of error. */
3293 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3294 && !DECL_THUNK_P (decl))
3295 DECL_SOURCE_LOCATION (decl) = input_location;
3297 note_vague_linkage_fn (decl);
3300 assemble_external (decl);
3302 /* Is it a synthesized method that needs to be synthesized? */
3303 if (TREE_CODE (decl) == FUNCTION_DECL
3304 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3305 && DECL_ARTIFICIAL (decl)
3306 && !DECL_THUNK_P (decl)
3307 && ! DECL_INITIAL (decl)
3308 /* Kludge: don't synthesize for default args. Unfortunately this
3309 rules out initializers of namespace-scoped objects too, but
3310 it's sort-of ok if the implicit ctor or dtor decl keeps
3311 pointing to the class location. */
3312 && current_function_decl)
3314 synthesize_method (decl);
3315 /* If we've already synthesized the method we don't need to
3316 do the instantiation test below. */
3318 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3319 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3320 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3321 || (TREE_CODE (decl) == FUNCTION_DECL
3322 && DECL_INLINE (DECL_TEMPLATE_RESULT
3323 (template_for_substitution (decl))))
3324 /* We need to instantiate static data members so that there
3325 initializers are available in integral constant
3327 || (TREE_CODE (decl) == VAR_DECL
3328 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3329 /* If this is a function or variable that is an instance of some
3330 template, we now know that we will need to actually do the
3331 instantiation. We check that DECL is not an explicit
3332 instantiation because that is not checked in instantiate_decl.
3334 We put off instantiating functions in order to improve compile
3335 times. Maintaining a stack of active functions is expensive,
3336 and the inliner knows to instantiate any functions it might
3337 need. Therefore, we always try to defer instantiation. */
3338 instantiate_decl (decl, /*defer_ok=*/true,
3339 /*expl_inst_class_mem_p=*/false);
3341 processing_template_decl = saved_processing_template_decl;
3344 #include "gt-cp-decl2.h"