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 DECL_CONTEXT (decl) = current_class_type;
718 /* We cannot call pushdecl here, because that would fill in the
719 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
720 the right thing, namely, to put this decl out straight away. */
722 if (! processing_template_decl && TREE_PUBLIC (decl))
723 note_vague_linkage_var (decl);
725 if (LOCAL_CLASS_P (current_class_type))
726 pedwarn ("local class %q#T shall not have static data member %q#D",
727 current_class_type, decl);
729 /* Static consts need not be initialized in the class definition. */
730 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
732 static int explained = 0;
734 error ("initializer invalid for static member with constructor");
737 error ("(an out of class initialization is required)");
742 /* Force the compiler to know when an uninitialized static const
743 member is being used. */
744 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
745 TREE_USED (decl) = 1;
746 DECL_INITIAL (decl) = init;
747 DECL_IN_AGGR_P (decl) = 1;
749 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
752 /* DECLARATOR and DECLSPECS correspond to a class member. The other
753 parameters are as for cp_finish_decl. Return the DECL for the
754 class member declared. */
757 grokfield (const cp_declarator *declarator,
758 cp_decl_specifier_seq *declspecs,
759 tree init, bool init_const_expr_p,
764 const char *asmspec = 0;
765 int flags = LOOKUP_ONLYCONVERTING;
767 if (!declspecs->any_specifiers_p
768 && declarator->kind == cdk_id
769 && declarator->u.id.qualifying_scope
770 && TYPE_P (declarator->u.id.qualifying_scope)
771 && IS_AGGR_TYPE (declarator->u.id.qualifying_scope)
772 && TREE_CODE (declarator->u.id.unqualified_name) == IDENTIFIER_NODE)
773 /* Access declaration */
774 return do_class_using_decl (declarator->u.id.qualifying_scope,
775 declarator->u.id.unqualified_name);
778 && TREE_CODE (init) == TREE_LIST
779 && TREE_VALUE (init) == error_mark_node
780 && TREE_CHAIN (init) == NULL_TREE)
783 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
784 if (! value || error_operand_p (value))
785 /* friend or constructor went bad. */
786 return error_mark_node;
788 if (TREE_CODE (value) == TYPE_DECL && init)
790 error ("typedef %qD is initialized (use __typeof__ instead)", value);
794 /* Pass friendly classes back. */
795 if (value == void_type_node)
798 /* Pass friend decls back. */
799 if ((TREE_CODE (value) == FUNCTION_DECL
800 || TREE_CODE (value) == TEMPLATE_DECL)
801 && DECL_CONTEXT (value) != current_class_type)
804 if (DECL_NAME (value) != NULL_TREE
805 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
806 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
807 error ("member %qD conflicts with virtual function table field name",
810 /* Stash away type declarations. */
811 if (TREE_CODE (value) == TYPE_DECL)
813 DECL_NONLOCAL (value) = 1;
814 DECL_CONTEXT (value) = current_class_type;
816 if (processing_template_decl)
817 value = push_template_decl (value);
821 /* Avoid storing attributes in template parameters:
822 tsubst is not ready to handle them. */
823 tree type = TREE_TYPE (value);
824 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
825 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
826 sorry ("applying attributes to template parameters is not implemented");
828 cplus_decl_attributes (&value, attrlist, 0);
834 if (DECL_IN_AGGR_P (value))
836 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
837 return void_type_node;
840 if (asmspec_tree && asmspec_tree != error_mark_node)
841 asmspec = TREE_STRING_POINTER (asmspec_tree);
845 if (TREE_CODE (value) == FUNCTION_DECL)
847 /* Initializers for functions are rejected early in the parser.
848 If we get here, it must be a pure specifier for a method. */
849 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
851 gcc_assert (error_operand_p (init) || integer_zerop (init));
852 DECL_PURE_VIRTUAL_P (value) = 1;
856 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
857 error ("initializer specified for static member function %qD",
861 else if (pedantic && TREE_CODE (value) != VAR_DECL)
862 /* Already complained in grokdeclarator. */
864 else if (!processing_template_decl)
866 if (TREE_CODE (init) == CONSTRUCTOR)
867 init = digest_init (TREE_TYPE (value), init);
869 init = integral_constant_value (init);
871 if (init != error_mark_node && !TREE_CONSTANT (init))
873 /* We can allow references to things that are effectively
874 static, since references are initialized with the
876 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
877 || (TREE_STATIC (init) == 0
878 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
880 error ("field initializer is not constant");
881 init = error_mark_node;
887 if (processing_template_decl
888 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
890 value = push_template_decl (value);
891 if (error_operand_p (value))
892 return error_mark_node;
896 cplus_decl_attributes (&value, attrlist, 0);
898 switch (TREE_CODE (value))
901 finish_static_data_member_decl (value, init, init_const_expr_p,
902 asmspec_tree, flags);
907 error ("%<asm%> specifiers are not permitted on non-static data members");
908 if (DECL_INITIAL (value) == error_mark_node)
909 init = error_mark_node;
910 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
912 DECL_INITIAL (value) = init;
913 DECL_IN_AGGR_P (value) = 1;
918 set_user_assembler_name (value, asmspec);
920 cp_finish_decl (value,
922 /*init_const_expr_p=*/false,
923 asmspec_tree, flags);
925 /* Pass friends back this way. */
926 if (DECL_FRIEND_P (value))
927 return void_type_node;
929 DECL_IN_AGGR_P (value) = 1;
938 /* Like `grokfield', but for bitfields.
939 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
942 grokbitfield (const cp_declarator *declarator,
943 cp_decl_specifier_seq *declspecs, tree width)
945 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
947 if (value == error_mark_node)
948 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 == error_mark_node)
1115 if (main_decl == NULL_TREE)
1117 warning (0, "anonymous union with no members");
1121 if (!processing_template_decl)
1123 /* Use main_decl to set the mangled name. */
1124 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1125 mangle_decl (anon_union_decl);
1126 DECL_NAME (anon_union_decl) = NULL_TREE;
1129 pushdecl (anon_union_decl);
1130 if (building_stmt_tree ()
1131 && at_function_scope_p ())
1132 add_decl_expr (anon_union_decl);
1133 else if (!processing_template_decl)
1134 rest_of_decl_compilation (anon_union_decl,
1135 toplevel_bindings_p (), at_eof);
1138 /* Auxiliary functions to make type signatures for
1139 `operator new' and `operator delete' correspond to
1140 what compiler will be expecting. */
1143 coerce_new_type (tree type)
1146 tree args = TYPE_ARG_TYPES (type);
1148 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1150 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1153 error ("%<operator new%> must return type %qT", ptr_type_node);
1156 if (!args || args == void_list_node
1157 || !same_type_p (TREE_VALUE (args), size_type_node))
1160 if (args && args != void_list_node)
1161 args = TREE_CHAIN (args);
1162 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1163 "as first parameter", size_type_node);
1168 args = tree_cons (NULL_TREE, size_type_node, args);
1171 type = build_exception_variant
1172 (build_function_type (ptr_type_node, args),
1173 TYPE_RAISES_EXCEPTIONS (type));
1181 coerce_delete_type (tree type)
1184 tree args = TYPE_ARG_TYPES (type);
1186 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1188 if (!same_type_p (TREE_TYPE (type), void_type_node))
1191 error ("%<operator delete%> must return type %qT", void_type_node);
1194 if (!args || args == void_list_node
1195 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1198 if (args && args != void_list_node)
1199 args = TREE_CHAIN (args);
1200 error ("%<operator delete%> takes type %qT as first parameter",
1206 args = tree_cons (NULL_TREE, ptr_type_node, args);
1209 type = build_exception_variant
1210 (build_function_type (void_type_node, args),
1211 TYPE_RAISES_EXCEPTIONS (type));
1220 mark_vtable_entries (tree decl)
1223 unsigned HOST_WIDE_INT idx;
1225 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1230 STRIP_NOPS (fnaddr);
1232 if (TREE_CODE (fnaddr) != ADDR_EXPR
1233 && TREE_CODE (fnaddr) != FDESC_EXPR)
1234 /* This entry is an offset: a virtual base class offset, a
1235 virtual call offset, an RTTI offset, etc. */
1238 fn = TREE_OPERAND (fnaddr, 0);
1239 TREE_ADDRESSABLE (fn) = 1;
1240 /* When we don't have vcall offsets, we output thunks whenever
1241 we output the vtables that contain them. With vcall offsets,
1242 we know all the thunks we'll need when we emit a virtual
1243 function, so we emit the thunks there instead. */
1244 if (DECL_THUNK_P (fn))
1245 use_thunk (fn, /*emit_p=*/0);
1250 /* Set DECL up to have the closest approximation of "initialized common"
1251 linkage available. */
1254 comdat_linkage (tree decl)
1257 make_decl_one_only (decl);
1258 else if (TREE_CODE (decl) == FUNCTION_DECL
1259 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1260 /* We can just emit function and compiler-generated variables
1261 statically; having multiple copies is (for the most part) only
1264 There are two correctness issues, however: the address of a
1265 template instantiation with external linkage should be the
1266 same, independent of what translation unit asks for the
1267 address, and this will not hold when we emit multiple copies of
1268 the function. However, there's little else we can do.
1270 Also, by default, the typeinfo implementation assumes that
1271 there will be only one copy of the string used as the name for
1272 each type. Therefore, if weak symbols are unavailable, the
1273 run-time library should perform a more conservative check; it
1274 should perform a string comparison, rather than an address
1276 TREE_PUBLIC (decl) = 0;
1279 /* Static data member template instantiations, however, cannot
1280 have multiple copies. */
1281 if (DECL_INITIAL (decl) == 0
1282 || DECL_INITIAL (decl) == error_mark_node)
1283 DECL_COMMON (decl) = 1;
1284 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1286 DECL_COMMON (decl) = 1;
1287 DECL_INITIAL (decl) = error_mark_node;
1289 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1291 /* We can't do anything useful; leave vars for explicit
1293 DECL_EXTERNAL (decl) = 1;
1294 DECL_NOT_REALLY_EXTERN (decl) = 0;
1298 if (DECL_LANG_SPECIFIC (decl))
1299 DECL_COMDAT (decl) = 1;
1302 /* For win32 we also want to put explicit instantiations in
1303 linkonce sections, so that they will be merged with implicit
1304 instantiations; otherwise we get duplicate symbol errors.
1305 For Darwin we do not want explicit instantiations to be
1309 maybe_make_one_only (tree decl)
1311 /* We used to say that this was not necessary on targets that support weak
1312 symbols, because the implicit instantiations will defer to the explicit
1313 one. However, that's not actually the case in SVR4; a strong definition
1314 after a weak one is an error. Also, not making explicit
1315 instantiations one_only means that we can end up with two copies of
1316 some template instantiations. */
1320 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1321 we can get away with not emitting them if they aren't used. We need
1322 to for variables so that cp_finish_decl will update their linkage,
1323 because their DECL_INITIAL may not have been set properly yet. */
1325 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1326 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1327 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1329 make_decl_one_only (decl);
1331 if (TREE_CODE (decl) == VAR_DECL)
1333 DECL_COMDAT (decl) = 1;
1334 /* Mark it needed so we don't forget to emit it. */
1335 mark_decl_referenced (decl);
1340 /* Determine whether or not we want to specifically import or export CTYPE,
1341 using various heuristics. */
1344 import_export_class (tree ctype)
1346 /* -1 for imported, 1 for exported. */
1347 int import_export = 0;
1349 /* It only makes sense to call this function at EOF. The reason is
1350 that this function looks at whether or not the first non-inline
1351 non-abstract virtual member function has been defined in this
1352 translation unit. But, we can't possibly know that until we've
1353 seen the entire translation unit. */
1354 gcc_assert (at_eof);
1356 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1359 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1360 we will have CLASSTYPE_INTERFACE_ONLY set but not
1361 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1362 heuristic because someone will supply a #pragma implementation
1363 elsewhere, and deducing it here would produce a conflict. */
1364 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1367 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1369 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1371 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1372 && !flag_implicit_templates)
1373 /* For a template class, without -fimplicit-templates, check the
1374 repository. If the virtual table is assigned to this
1375 translation unit, then export the class; otherwise, import
1377 import_export = repo_export_class_p (ctype) ? 1 : -1;
1378 else if (TYPE_POLYMORPHIC_P (ctype))
1380 /* The ABI specifies that the virtual table and associated
1381 information are emitted with the key method, if any. */
1382 tree method = CLASSTYPE_KEY_METHOD (ctype);
1383 /* If weak symbol support is not available, then we must be
1384 careful not to emit the vtable when the key function is
1385 inline. An inline function can be defined in multiple
1386 translation units. If we were to emit the vtable in each
1387 translation unit containing a definition, we would get
1388 multiple definition errors at link-time. */
1389 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1390 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1393 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1394 a definition anywhere else. */
1395 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1398 /* Allow backends the chance to overrule the decision. */
1399 if (targetm.cxx.import_export_class)
1400 import_export = targetm.cxx.import_export_class (ctype, import_export);
1404 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1405 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1409 /* Return true if VAR has already been provided to the back end; in that
1410 case VAR should not be modified further by the front end. */
1412 var_finalized_p (tree var)
1414 return cgraph_varpool_node (var)->finalized;
1417 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1418 must be emitted in this translation unit. Mark it as such. */
1421 mark_needed (tree decl)
1423 /* It's possible that we no longer need to set
1424 TREE_SYMBOL_REFERENCED here directly, but doing so is
1426 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1427 mark_decl_referenced (decl);
1430 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1431 returns true if a definition of this entity should be provided in
1432 this object file. Callers use this function to determine whether
1433 or not to let the back end know that a definition of DECL is
1434 available in this translation unit. */
1437 decl_needed_p (tree decl)
1439 gcc_assert (TREE_CODE (decl) == VAR_DECL
1440 || TREE_CODE (decl) == FUNCTION_DECL);
1441 /* This function should only be called at the end of the translation
1442 unit. We cannot be sure of whether or not something will be
1443 COMDAT until that point. */
1444 gcc_assert (at_eof);
1446 /* All entities with external linkage that are not COMDAT should be
1447 emitted; they may be referred to from other object files. */
1448 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1450 /* If this entity was used, let the back-end see it; it will decide
1451 whether or not to emit it into the object file. */
1452 if (TREE_USED (decl)
1453 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1454 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1456 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1457 reference to DECL might cause it to be emitted later. */
1461 /* If necessary, write out the vtables for the dynamic class CTYPE.
1462 Returns true if any vtables were emitted. */
1465 maybe_emit_vtables (tree ctype)
1471 /* If the vtables for this class have already been emitted there is
1472 nothing more to do. */
1473 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1474 if (var_finalized_p (primary_vtbl))
1476 /* Ignore dummy vtables made by get_vtable_decl. */
1477 if (TREE_TYPE (primary_vtbl) == void_type_node)
1480 /* On some targets, we cannot determine the key method until the end
1481 of the translation unit -- which is when this function is
1483 if (!targetm.cxx.key_method_may_be_inline ())
1484 determine_key_method (ctype);
1486 /* See if any of the vtables are needed. */
1487 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1489 import_export_decl (vtbl);
1490 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1495 /* If the references to this class' vtables are optimized away,
1496 still emit the appropriate debugging information. See
1498 if (DECL_COMDAT (primary_vtbl)
1499 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1500 note_debug_info_needed (ctype);
1504 /* The ABI requires that we emit all of the vtables if we emit any
1506 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1508 /* Mark entities references from the virtual table as used. */
1509 mark_vtable_entries (vtbl);
1511 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1513 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1515 /* It had better be all done at compile-time. */
1520 DECL_EXTERNAL (vtbl) = 0;
1521 rest_of_decl_compilation (vtbl, 1, 1);
1523 /* Because we're only doing syntax-checking, we'll never end up
1524 actually marking the variable as written. */
1525 if (flag_syntax_only)
1526 TREE_ASM_WRITTEN (vtbl) = 1;
1529 /* Since we're writing out the vtable here, also write the debug
1531 note_debug_info_needed (ctype);
1536 /* A special return value from type_visibility meaning internal
1539 enum { VISIBILITY_STATIC = VISIBILITY_INTERNAL+1 };
1541 /* walk_tree helper function for type_visibility. */
1544 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1546 int *vis_p = (int *)data;
1551 else if (CLASS_TYPE_P (*tp))
1553 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1555 *vis_p = VISIBILITY_STATIC;
1558 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1559 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1564 /* Returns the visibility of TYPE, which is the minimum visibility of its
1568 type_visibility (tree type)
1570 int vis = VISIBILITY_DEFAULT;
1571 walk_tree_without_duplicates (&type, min_vis_r, &vis);
1575 /* Limit the visibility of DECL to VISIBILITY. SPECIFIED is true if the
1576 constraint comes from an attribute or pragma; REASON is the source of
1580 constrain_visibility (tree decl, int visibility, bool specified,
1583 if (visibility == VISIBILITY_STATIC)
1585 TREE_PUBLIC (decl) = 0;
1586 DECL_INTERFACE_KNOWN (decl) = 1;
1587 if (DECL_LANG_SPECIFIC (decl))
1588 DECL_NOT_REALLY_EXTERN (decl) = 1;
1590 else if (visibility > DECL_VISIBILITY (decl))
1592 if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)))
1593 warning (OPT_Wattributes, "%q+D: visibility attribute requests "
1594 "greater visibility than its %s allows", decl, reason);
1595 DECL_VISIBILITY (decl) = visibility;
1596 if (!DECL_VISIBILITY_SPECIFIED (decl))
1597 DECL_VISIBILITY_SPECIFIED (decl) = specified;
1603 /* Constrain the visibility of DECL based on the visibility of its template
1607 constrain_visibility_for_template (tree decl, tree targs)
1609 /* If this is a template instantiation, check the innermost
1610 template args for visibility constraints. The outer template
1611 args are covered by the class check. */
1612 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1614 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1618 tree arg = TREE_VEC_ELT (args, i-1);
1620 vis = type_visibility (arg);
1621 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1624 if (TREE_CODE (arg) == ADDR_EXPR)
1625 arg = TREE_OPERAND (arg, 0);
1626 if (TREE_CODE (arg) == VAR_DECL
1627 || TREE_CODE (arg) == FUNCTION_DECL)
1629 if (! TREE_PUBLIC (arg))
1630 vis = VISIBILITY_STATIC;
1632 vis = DECL_VISIBILITY (arg);
1636 constrain_visibility (decl, vis, false, "template parameter");
1640 /* Like c_determine_visibility, but with additional C++-specific
1643 Function-scope entities can rely on the function's visibility because
1644 it is set in start_preparsed_function.
1646 Class-scope entities cannot rely on the class's visibility until the end
1647 of the enclosing class definition.
1649 Note that because namespaces have multiple independent definitions,
1650 namespace visibility is handled elsewhere using the #pragma visibility
1651 machinery rather than by decorating the namespace declaration.
1653 The goal is for constraints from the type to give a diagnostic, and
1654 other constraints to be applied silently. */
1657 determine_visibility (tree decl)
1659 tree class_type = NULL_TREE;
1662 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1664 /* Only relevant for names with external linkage. */
1665 if (!TREE_PUBLIC (decl))
1668 /* Cloned constructors and destructors get the same visibility as
1669 the underlying function. That should be set up in
1670 maybe_clone_body. */
1671 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1673 if (TREE_CODE (decl) == TYPE_DECL)
1675 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1676 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1677 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1682 else if (DECL_LANG_SPECIFIC (decl))
1683 use_template = DECL_USE_TEMPLATE (decl);
1687 /* Anything that is exported must have default visibility. */
1688 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1689 && lookup_attribute ("dllexport",
1690 TREE_CODE (decl) == TYPE_DECL
1691 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
1692 : DECL_ATTRIBUTES (decl)))
1694 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1695 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1698 /* If DECL is a member of a class, visibility specifiers on the
1699 class can influence the visibility of the DECL. */
1700 if (DECL_CLASS_SCOPE_P (decl))
1701 class_type = DECL_CONTEXT (decl);
1702 else if (TREE_CODE (decl) == VAR_DECL
1703 && DECL_TINFO_P (decl)
1704 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1705 class_type = TREE_TYPE (DECL_NAME (decl));
1708 /* Not a class member. */
1710 /* Virtual tables have DECL_CONTEXT set to their associated class,
1711 so they are automatically handled above. */
1712 gcc_assert (TREE_CODE (decl) != VAR_DECL
1713 || !DECL_VTABLE_OR_VTT_P (decl));
1715 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1717 /* Local statics and classes get the visibility of their
1718 containing function by default, except that
1719 -fvisibility-inlines-hidden doesn't affect them. */
1720 tree fn = DECL_CONTEXT (decl);
1721 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1723 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1724 DECL_VISIBILITY_SPECIFIED (decl) =
1725 DECL_VISIBILITY_SPECIFIED (fn);
1728 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1730 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1731 but have no TEMPLATE_INFO, so don't try to check it. */
1734 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1736 /* tinfo visibility is based on the type it's for. */
1737 constrain_visibility
1738 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))),
1741 else if (use_template)
1742 /* Template instantiations and specializations get visibility based
1743 on their template unless they override it with an attribute. */;
1744 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1746 /* Set default visibility to whatever the user supplied with
1747 #pragma GCC visibility or a namespace visibility attribute. */
1748 DECL_VISIBILITY (decl) = default_visibility;
1749 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1755 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1756 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1757 : DECL_TEMPLATE_INFO (decl));
1758 tree args = TI_ARGS (tinfo);
1759 int depth = TMPL_ARGS_DEPTH (args);
1761 /* If the template has explicit visibility and the specialization
1762 doesn't, use the visibility from the template. */
1763 if (!DECL_VISIBILITY_SPECIFIED (decl))
1765 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1766 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1769 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1770 if (args && depth > template_class_depth (class_type))
1771 /* Don't let it have more visibility than its template type
1773 constrain_visibility_for_template (decl, args);
1777 determine_visibility_from_class (decl, class_type);
1779 /* Don't let it have more visibility than its type. */
1780 if (TREE_CODE (decl) != TYPE_DECL)
1781 if (constrain_visibility (decl, type_visibility (TREE_TYPE (decl)),
1783 warning (OPT_Wattributes, "\
1784 %q+D declared with greater visibility than its type",
1787 if (decl_anon_ns_mem_p (decl))
1788 /* Names in an anonymous namespace get internal linkage.
1789 This might change once we implement export. */
1790 constrain_visibility (decl, VISIBILITY_STATIC,
1791 false, "namespace");
1794 /* By default, static data members and function members receive
1795 the visibility of their containing class. */
1798 determine_visibility_from_class (tree decl, tree class_type)
1800 if (visibility_options.inlines_hidden
1801 /* Don't do this for inline templates; specializations might not be
1802 inline, and we don't want them to inherit the hidden
1803 visibility. We'll set it here for all inline instantiations. */
1804 && !processing_template_decl
1805 && ! DECL_VISIBILITY_SPECIFIED (decl)
1806 && TREE_CODE (decl) == FUNCTION_DECL
1807 && DECL_DECLARED_INLINE_P (decl))
1808 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1810 /* The decl can't have more visibility than its class. */
1811 constrain_visibility (decl, CLASSTYPE_VISIBILITY (class_type),
1812 CLASSTYPE_VISIBILITY_SPECIFIED (class_type),
1815 /* Give the target a chance to override the visibility associated
1817 if (TREE_CODE (decl) == VAR_DECL
1818 && (DECL_TINFO_P (decl)
1819 || (DECL_VTABLE_OR_VTT_P (decl)
1820 /* Construction virtual tables are not exported because
1821 they cannot be referred to from other object files;
1822 their name is not standardized by the ABI. */
1823 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1824 && TREE_PUBLIC (decl)
1825 && !DECL_REALLY_EXTERN (decl)
1826 && DECL_VISIBILITY_SPECIFIED (decl)
1827 && (!class_type || !CLASSTYPE_VISIBILITY_SPECIFIED (class_type)))
1828 targetm.cxx.determine_class_data_visibility (decl);
1831 /* Constrain the visibility of a class TYPE based on the visibility of its
1832 field types. Warn if any fields require lesser visibility. */
1835 constrain_class_visibility (tree type)
1837 tree decl = TYPE_MAIN_DECL (type);
1838 tree binfo = TYPE_BINFO (type);
1842 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1843 if (TREE_CODE (t) == FIELD_DECL)
1844 if (constrain_visibility (decl, type_visibility (TREE_TYPE (t)),
1845 false, "field type"))
1846 warning (OPT_Wattributes, "\
1847 %qT declared with greater visibility than the type of its field %qD",
1850 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1851 if (constrain_visibility (decl, type_visibility (TREE_TYPE (t)),
1852 false, "base type"))
1853 warning (OPT_Wattributes, "\
1854 %qT declared with greater visibility than its base %qT",
1855 type, TREE_TYPE (t));
1858 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1859 for DECL has not already been determined, do so now by setting
1860 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1861 function is called entities with vague linkage whose definitions
1862 are available must have TREE_PUBLIC set.
1864 If this function decides to place DECL in COMDAT, it will set
1865 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1866 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1867 callers defer that decision until it is clear that DECL is actually
1871 import_export_decl (tree decl)
1876 tree class_type = NULL_TREE;
1878 if (DECL_INTERFACE_KNOWN (decl))
1881 /* We cannot determine what linkage to give to an entity with vague
1882 linkage until the end of the file. For example, a virtual table
1883 for a class will be defined if and only if the key method is
1884 defined in this translation unit. As a further example, consider
1885 that when compiling a translation unit that uses PCH file with
1886 "-frepo" it would be incorrect to make decisions about what
1887 entities to emit when building the PCH; those decisions must be
1888 delayed until the repository information has been processed. */
1889 gcc_assert (at_eof);
1890 /* Object file linkage for explicit instantiations is handled in
1891 mark_decl_instantiated. For static variables in functions with
1892 vague linkage, maybe_commonize_var is used.
1894 Therefore, the only declarations that should be provided to this
1895 function are those with external linkage that are:
1897 * implicit instantiations of function templates
1901 * implicit instantiations of static data members of class
1908 Furthermore, all entities that reach this point must have a
1909 definition available in this translation unit.
1911 The following assertions check these conditions. */
1912 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1913 || TREE_CODE (decl) == VAR_DECL);
1914 /* Any code that creates entities with TREE_PUBLIC cleared should
1915 also set DECL_INTERFACE_KNOWN. */
1916 gcc_assert (TREE_PUBLIC (decl));
1917 if (TREE_CODE (decl) == FUNCTION_DECL)
1918 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1919 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1920 || DECL_DECLARED_INLINE_P (decl));
1922 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1923 || DECL_VTABLE_OR_VTT_P (decl)
1924 || DECL_TINFO_P (decl));
1925 /* Check that a definition of DECL is available in this translation
1927 gcc_assert (!DECL_REALLY_EXTERN (decl));
1929 /* Assume that DECL will not have COMDAT linkage. */
1931 /* Assume that DECL will not be imported into this translation
1935 /* See if the repository tells us whether or not to emit DECL in
1936 this translation unit. */
1937 emit_p = repo_emit_p (decl);
1940 else if (emit_p == 1)
1942 /* The repository indicates that this entity should be defined
1943 here. Make sure the back end honors that request. */
1944 if (TREE_CODE (decl) == VAR_DECL)
1946 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1947 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1950 FOR_EACH_CLONE (clone, decl)
1951 mark_needed (clone);
1955 /* Output the definition as an ordinary strong definition. */
1956 DECL_EXTERNAL (decl) = 0;
1957 DECL_INTERFACE_KNOWN (decl) = 1;
1962 /* We have already decided what to do with this DECL; there is no
1963 need to check anything further. */
1965 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1967 class_type = DECL_CONTEXT (decl);
1968 import_export_class (class_type);
1969 if (TYPE_FOR_JAVA (class_type))
1971 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
1972 && CLASSTYPE_INTERFACE_ONLY (class_type))
1974 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
1975 && !CLASSTYPE_USE_TEMPLATE (class_type)
1976 && CLASSTYPE_KEY_METHOD (class_type)
1977 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
1978 /* The ABI requires that all virtual tables be emitted with
1979 COMDAT linkage. However, on systems where COMDAT symbols
1980 don't show up in the table of contents for a static
1981 archive, or on systems without weak symbols (where we
1982 approximate COMDAT linkage by using internal linkage), the
1983 linker will report errors about undefined symbols because
1984 it will not see the virtual table definition. Therefore,
1985 in the case that we know that the virtual table will be
1986 emitted in only one translation unit, we make the virtual
1987 table an ordinary definition with external linkage. */
1988 DECL_EXTERNAL (decl) = 0;
1989 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
1991 /* CLASS_TYPE is being exported from this translation unit,
1992 so DECL should be defined here. */
1993 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
1994 /* If a class is declared in a header with the "extern
1995 template" extension, then it will not be instantiated,
1996 even in translation units that would normally require
1997 it. Often such classes are explicitly instantiated in
1998 one translation unit. Therefore, the explicit
1999 instantiation must be made visible to other translation
2001 DECL_EXTERNAL (decl) = 0;
2004 /* The generic C++ ABI says that class data is always
2005 COMDAT, even if there is a key function. Some
2006 variants (e.g., the ARM EABI) says that class data
2007 only has COMDAT linkage if the class data might be
2008 emitted in more than one translation unit. When the
2009 key method can be inline and is inline, we still have
2010 to arrange for comdat even though
2011 class_data_always_comdat is false. */
2012 if (!CLASSTYPE_KEY_METHOD (class_type)
2013 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2014 || targetm.cxx.class_data_always_comdat ())
2016 /* The ABI requires COMDAT linkage. Normally, we
2017 only emit COMDAT things when they are needed;
2018 make sure that we realize that this entity is
2025 else if (!flag_implicit_templates
2026 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2031 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2033 tree type = TREE_TYPE (DECL_NAME (decl));
2034 if (CLASS_TYPE_P (type))
2037 import_export_class (type);
2038 if (CLASSTYPE_INTERFACE_KNOWN (type)
2039 && TYPE_POLYMORPHIC_P (type)
2040 && CLASSTYPE_INTERFACE_ONLY (type)
2041 /* If -fno-rtti was specified, then we cannot be sure
2042 that RTTI information will be emitted with the
2043 virtual table of the class, so we must emit it
2044 wherever it is used. */
2049 if (CLASSTYPE_INTERFACE_KNOWN (type)
2050 && !CLASSTYPE_INTERFACE_ONLY (type))
2052 comdat_p = (targetm.cxx.class_data_always_comdat ()
2053 || (CLASSTYPE_KEY_METHOD (type)
2054 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2059 DECL_EXTERNAL (decl) = 0;
2069 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2070 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2072 /* DECL is an implicit instantiation of a function or static
2074 if (flag_implicit_templates
2075 || (flag_implicit_inline_templates
2076 && TREE_CODE (decl) == FUNCTION_DECL
2077 && DECL_DECLARED_INLINE_P (decl)))
2080 /* If we are not implicitly generating templates, then mark
2081 this entity as undefined in this translation unit. */
2084 else if (DECL_FUNCTION_MEMBER_P (decl))
2086 if (!DECL_DECLARED_INLINE_P (decl))
2088 tree ctype = DECL_CONTEXT (decl);
2089 import_export_class (ctype);
2090 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2092 DECL_NOT_REALLY_EXTERN (decl)
2093 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2094 || (DECL_DECLARED_INLINE_P (decl)
2095 && ! flag_implement_inlines
2096 && !DECL_VINDEX (decl)));
2098 if (!DECL_NOT_REALLY_EXTERN (decl))
2099 DECL_EXTERNAL (decl) = 1;
2101 /* Always make artificials weak. */
2102 if (DECL_ARTIFICIAL (decl) && flag_weak)
2105 maybe_make_one_only (decl);
2116 /* If we are importing DECL into this translation unit, mark is
2117 an undefined here. */
2118 DECL_EXTERNAL (decl) = 1;
2119 DECL_NOT_REALLY_EXTERN (decl) = 0;
2123 /* If we decided to put DECL in COMDAT, mark it accordingly at
2125 comdat_linkage (decl);
2128 DECL_INTERFACE_KNOWN (decl) = 1;
2131 /* Return an expression that performs the destruction of DECL, which
2132 must be a VAR_DECL whose type has a non-trivial destructor, or is
2133 an array whose (innermost) elements have a non-trivial destructor. */
2136 build_cleanup (tree decl)
2139 tree type = TREE_TYPE (decl);
2141 /* This function should only be called for declarations that really
2142 require cleanups. */
2143 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2145 /* Treat all objects with destructors as used; the destructor may do
2146 something substantive. */
2149 if (TREE_CODE (type) == ARRAY_TYPE)
2153 cxx_mark_addressable (decl);
2154 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
2156 temp = build_delete (TREE_TYPE (temp), temp,
2157 sfk_complete_destructor,
2158 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2162 /* Returns the initialization guard variable for the variable DECL,
2163 which has static storage duration. */
2166 get_guard (tree decl)
2171 sname = mangle_guard_variable (decl);
2172 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2177 /* We use a type that is big enough to contain a mutex as well
2178 as an integer counter. */
2179 guard_type = targetm.cxx.guard_type ();
2180 guard = build_decl (VAR_DECL, sname, guard_type);
2182 /* The guard should have the same linkage as what it guards. */
2183 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2184 TREE_STATIC (guard) = TREE_STATIC (decl);
2185 DECL_COMMON (guard) = DECL_COMMON (decl);
2186 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2187 if (TREE_PUBLIC (decl))
2188 DECL_WEAK (guard) = DECL_WEAK (decl);
2190 DECL_ARTIFICIAL (guard) = 1;
2191 DECL_IGNORED_P (guard) = 1;
2192 TREE_USED (guard) = 1;
2193 pushdecl_top_level_and_finish (guard, NULL_TREE);
2198 /* Return those bits of the GUARD variable that should be set when the
2199 guarded entity is actually initialized. */
2202 get_guard_bits (tree guard)
2204 if (!targetm.cxx.guard_mask_bit ())
2206 /* We only set the first byte of the guard, in order to leave room
2207 for a mutex in the high-order bits. */
2208 guard = build1 (ADDR_EXPR,
2209 build_pointer_type (TREE_TYPE (guard)),
2211 guard = build1 (NOP_EXPR,
2212 build_pointer_type (char_type_node),
2214 guard = build1 (INDIRECT_REF, char_type_node, guard);
2220 /* Return an expression which determines whether or not the GUARD
2221 variable has already been initialized. */
2224 get_guard_cond (tree guard)
2228 /* Check to see if the GUARD is zero. */
2229 guard = get_guard_bits (guard);
2231 /* Mask off all but the low bit. */
2232 if (targetm.cxx.guard_mask_bit ())
2234 guard_value = integer_one_node;
2235 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2236 guard_value = convert (TREE_TYPE (guard), guard_value);
2237 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2240 guard_value = integer_zero_node;
2241 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2242 guard_value = convert (TREE_TYPE (guard), guard_value);
2243 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2246 /* Return an expression which sets the GUARD variable, indicating that
2247 the variable being guarded has been initialized. */
2250 set_guard (tree guard)
2254 /* Set the GUARD to one. */
2255 guard = get_guard_bits (guard);
2256 guard_init = integer_one_node;
2257 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2258 guard_init = convert (TREE_TYPE (guard), guard_init);
2259 return build_modify_expr (guard, NOP_EXPR, guard_init);
2262 /* Start the process of running a particular set of global constructors
2263 or destructors. Subroutine of do_[cd]tors. */
2266 start_objects (int method_type, int initp)
2272 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2274 if (initp != DEFAULT_INIT_PRIORITY)
2284 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2287 sprintf (type, "%c", method_type);
2289 fndecl = build_lang_decl (FUNCTION_DECL,
2290 get_file_function_name_long (type),
2291 build_function_type (void_type_node,
2293 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2295 /* It can be a static function as long as collect2 does not have
2296 to scan the object file to find its ctor/dtor routine. */
2297 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2299 /* Mark this declaration as used to avoid spurious warnings. */
2300 TREE_USED (current_function_decl) = 1;
2302 /* Mark this function as a global constructor or destructor. */
2303 if (method_type == 'I')
2304 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2306 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2307 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2309 body = begin_compound_stmt (BCS_FN_BODY);
2311 /* We cannot allow these functions to be elided, even if they do not
2312 have external linkage. And, there's no point in deferring
2313 compilation of these functions; they're all going to have to be
2315 DECL_INLINE (current_function_decl) = 0;
2316 DECL_UNINLINABLE (current_function_decl) = 1;
2321 /* Finish the process of running a particular set of global constructors
2322 or destructors. Subroutine of do_[cd]tors. */
2325 finish_objects (int method_type, int initp, tree body)
2330 finish_compound_stmt (body);
2331 fn = finish_function (0);
2332 expand_or_defer_fn (fn);
2334 /* When only doing semantic analysis, and no RTL generation, we
2335 can't call functions that directly emit assembly code; there is
2336 no assembly file in which to put the code. */
2337 if (flag_syntax_only)
2340 if (targetm.have_ctors_dtors)
2342 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2343 cgraph_mark_needed_node (cgraph_node (fn));
2344 if (method_type == 'I')
2345 (* targetm.asm_out.constructor) (fnsym, initp);
2347 (* targetm.asm_out.destructor) (fnsym, initp);
2351 /* The names of the parameters to the function created to handle
2352 initializations and destructions for objects with static storage
2354 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2355 #define PRIORITY_IDENTIFIER "__priority"
2357 /* The name of the function we create to handle initializations and
2358 destructions for objects with static storage duration. */
2359 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2361 /* The declaration for the __INITIALIZE_P argument. */
2362 static GTY(()) tree initialize_p_decl;
2364 /* The declaration for the __PRIORITY argument. */
2365 static GTY(()) tree priority_decl;
2367 /* The declaration for the static storage duration function. */
2368 static GTY(()) tree ssdf_decl;
2370 /* All the static storage duration functions created in this
2371 translation unit. */
2372 static GTY(()) VEC(tree,gc) *ssdf_decls;
2374 /* A map from priority levels to information about that priority
2375 level. There may be many such levels, so efficient lookup is
2377 static splay_tree priority_info_map;
2379 /* Begins the generation of the function that will handle all
2380 initialization and destruction of objects with static storage
2381 duration. The function generated takes two parameters of type
2382 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2383 nonzero, it performs initializations. Otherwise, it performs
2384 destructions. It only performs those initializations or
2385 destructions with the indicated __PRIORITY. The generated function
2388 It is assumed that this function will only be called once per
2389 translation unit. */
2392 start_static_storage_duration_function (unsigned count)
2397 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2399 /* Create the identifier for this function. It will be of the form
2400 SSDF_IDENTIFIER_<number>. */
2401 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2403 /* Create the parameters. */
2404 parm_types = void_list_node;
2405 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2406 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2407 type = build_function_type (void_type_node, parm_types);
2409 /* Create the FUNCTION_DECL itself. */
2410 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2411 get_identifier (id),
2413 TREE_PUBLIC (ssdf_decl) = 0;
2414 DECL_ARTIFICIAL (ssdf_decl) = 1;
2416 /* Put this function in the list of functions to be called from the
2417 static constructors and destructors. */
2420 ssdf_decls = VEC_alloc (tree, gc, 32);
2422 /* Take this opportunity to initialize the map from priority
2423 numbers to information about that priority level. */
2424 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2425 /*delete_key_fn=*/0,
2426 /*delete_value_fn=*/
2427 (splay_tree_delete_value_fn) &free);
2429 /* We always need to generate functions for the
2430 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2431 priorities later, we'll be sure to find the
2432 DEFAULT_INIT_PRIORITY. */
2433 get_priority_info (DEFAULT_INIT_PRIORITY);
2436 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2438 /* Create the argument list. */
2439 initialize_p_decl = cp_build_parm_decl
2440 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2441 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2442 TREE_USED (initialize_p_decl) = 1;
2443 priority_decl = cp_build_parm_decl
2444 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2445 DECL_CONTEXT (priority_decl) = ssdf_decl;
2446 TREE_USED (priority_decl) = 1;
2448 TREE_CHAIN (initialize_p_decl) = priority_decl;
2449 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2451 /* Put the function in the global scope. */
2452 pushdecl (ssdf_decl);
2454 /* Start the function itself. This is equivalent to declaring the
2457 static void __ssdf (int __initialize_p, init __priority_p);
2459 It is static because we only need to call this function from the
2460 various constructor and destructor functions for this module. */
2461 start_preparsed_function (ssdf_decl,
2462 /*attrs=*/NULL_TREE,
2465 /* Set up the scope of the outermost block in the function. */
2466 body = begin_compound_stmt (BCS_FN_BODY);
2468 /* This function must not be deferred because we are depending on
2469 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2470 DECL_INLINE (ssdf_decl) = 0;
2471 DECL_UNINLINABLE (ssdf_decl) = 1;
2476 /* Finish the generation of the function which performs initialization
2477 and destruction of objects with static storage duration. After
2478 this point, no more such objects can be created. */
2481 finish_static_storage_duration_function (tree body)
2483 /* Close out the function. */
2484 finish_compound_stmt (body);
2485 expand_or_defer_fn (finish_function (0));
2488 /* Return the information about the indicated PRIORITY level. If no
2489 code to handle this level has yet been generated, generate the
2490 appropriate prologue. */
2492 static priority_info
2493 get_priority_info (int priority)
2498 n = splay_tree_lookup (priority_info_map,
2499 (splay_tree_key) priority);
2502 /* Create a new priority information structure, and insert it
2504 pi = XNEW (struct priority_info_s);
2505 pi->initializations_p = 0;
2506 pi->destructions_p = 0;
2507 splay_tree_insert (priority_info_map,
2508 (splay_tree_key) priority,
2509 (splay_tree_value) pi);
2512 pi = (priority_info) n->value;
2517 /* The effective initialization priority of a DECL. */
2519 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2520 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2521 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2523 /* Whether a DECL needs a guard to protect it against multiple
2526 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2527 || DECL_ONE_ONLY (decl) \
2528 || DECL_WEAK (decl)))
2530 /* Set up to handle the initialization or destruction of DECL. If
2531 INITP is nonzero, we are initializing the variable. Otherwise, we
2532 are destroying it. */
2535 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2537 tree guard_if_stmt = NULL_TREE;
2540 /* If we are supposed to destruct and there's a trivial destructor,
2541 nothing has to be done. */
2543 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2546 /* Trick the compiler into thinking we are at the file and line
2547 where DECL was declared so that error-messages make sense, and so
2548 that the debugger will show somewhat sensible file and line
2550 input_location = DECL_SOURCE_LOCATION (decl);
2556 Access control for implicit calls to the constructors,
2557 the conversion functions, or the destructor called to
2558 create and destroy a static data member is performed as
2559 if these calls appeared in the scope of the member's
2562 we pretend we are in a static member function of the class of
2563 which the DECL is a member. */
2564 if (member_p (decl))
2566 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2567 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2570 /* Assume we don't need a guard. */
2572 /* We need a guard if this is an object with external linkage that
2573 might be initialized in more than one place. (For example, a
2574 static data member of a template, when the data member requires
2576 if (NEEDS_GUARD_P (decl))
2580 guard = get_guard (decl);
2582 /* When using __cxa_atexit, we just check the GUARD as we would
2583 for a local static. */
2584 if (flag_use_cxa_atexit)
2586 /* When using __cxa_atexit, we never try to destroy
2587 anything from a static destructor. */
2589 guard_cond = get_guard_cond (guard);
2591 /* If we don't have __cxa_atexit, then we will be running
2592 destructors from .fini sections, or their equivalents. So,
2593 we need to know how many times we've tried to initialize this
2594 object. We do initializations only if the GUARD is zero,
2595 i.e., if we are the first to initialize the variable. We do
2596 destructions only if the GUARD is one, i.e., if we are the
2597 last to destroy the variable. */
2600 = cp_build_binary_op (EQ_EXPR,
2601 build_unary_op (PREINCREMENT_EXPR,
2607 = cp_build_binary_op (EQ_EXPR,
2608 build_unary_op (PREDECREMENT_EXPR,
2613 guard_if_stmt = begin_if_stmt ();
2614 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2618 /* If we're using __cxa_atexit, we have not already set the GUARD,
2619 so we must do so now. */
2620 if (guard && initp && flag_use_cxa_atexit)
2621 finish_expr_stmt (set_guard (guard));
2623 /* Perform the initialization or destruction. */
2627 finish_expr_stmt (init);
2629 /* If we're using __cxa_atexit, register a function that calls the
2630 destructor for the object. */
2631 if (flag_use_cxa_atexit)
2632 finish_expr_stmt (register_dtor_fn (decl));
2635 finish_expr_stmt (build_cleanup (decl));
2637 /* Finish the guard if-stmt, if necessary. */
2640 finish_then_clause (guard_if_stmt);
2641 finish_if_stmt (guard_if_stmt);
2644 /* Now that we're done with DECL we don't need to pretend to be a
2645 member of its class any longer. */
2646 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2647 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2650 /* Generate code to do the initialization or destruction of the decls in VARS,
2651 a TREE_LIST of VAR_DECL with static storage duration.
2652 Whether initialization or destruction is performed is specified by INITP. */
2655 do_static_initialization_or_destruction (tree vars, bool initp)
2657 tree node, init_if_stmt, cond;
2659 /* Build the outer if-stmt to check for initialization or destruction. */
2660 init_if_stmt = begin_if_stmt ();
2661 cond = initp ? integer_one_node : integer_zero_node;
2662 cond = cp_build_binary_op (EQ_EXPR,
2665 finish_if_stmt_cond (cond, init_if_stmt);
2669 tree decl = TREE_VALUE (node);
2670 tree priority_if_stmt;
2674 /* If we don't need a destructor, there's nothing to do. Avoid
2675 creating a possibly empty if-stmt. */
2676 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2678 node = TREE_CHAIN (node);
2682 /* Remember that we had an initialization or finalization at this
2684 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2685 pi = get_priority_info (priority);
2687 pi->initializations_p = 1;
2689 pi->destructions_p = 1;
2691 /* Conditionalize this initialization on being in the right priority
2692 and being initializing/finalizing appropriately. */
2693 priority_if_stmt = begin_if_stmt ();
2694 cond = cp_build_binary_op (EQ_EXPR,
2696 build_int_cst (NULL_TREE, priority));
2697 finish_if_stmt_cond (cond, priority_if_stmt);
2699 /* Process initializers with same priority. */
2701 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2702 node = TREE_CHAIN (node))
2703 /* Do one initialization or destruction. */
2704 one_static_initialization_or_destruction (TREE_VALUE (node),
2705 TREE_PURPOSE (node), initp);
2707 /* Finish up the priority if-stmt body. */
2708 finish_then_clause (priority_if_stmt);
2709 finish_if_stmt (priority_if_stmt);
2713 /* Finish up the init/destruct if-stmt body. */
2714 finish_then_clause (init_if_stmt);
2715 finish_if_stmt (init_if_stmt);
2718 /* VARS is a list of variables with static storage duration which may
2719 need initialization and/or finalization. Remove those variables
2720 that don't really need to be initialized or finalized, and return
2721 the resulting list. The order in which the variables appear in
2722 VARS is in reverse order of the order in which they should actually
2723 be initialized. The list we return is in the unreversed order;
2724 i.e., the first variable should be initialized first. */
2727 prune_vars_needing_no_initialization (tree *vars)
2730 tree result = NULL_TREE;
2735 tree decl = TREE_VALUE (t);
2736 tree init = TREE_PURPOSE (t);
2738 /* Deal gracefully with error. */
2739 if (decl == error_mark_node)
2741 var = &TREE_CHAIN (t);
2745 /* The only things that can be initialized are variables. */
2746 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2748 /* If this object is not defined, we don't need to do anything
2750 if (DECL_EXTERNAL (decl))
2752 var = &TREE_CHAIN (t);
2756 /* Also, if the initializer already contains errors, we can bail
2758 if (init && TREE_CODE (init) == TREE_LIST
2759 && value_member (error_mark_node, init))
2761 var = &TREE_CHAIN (t);
2765 /* This variable is going to need initialization and/or
2766 finalization, so we add it to the list. */
2767 *var = TREE_CHAIN (t);
2768 TREE_CHAIN (t) = result;
2775 /* Make sure we have told the back end about all the variables in
2779 write_out_vars (tree vars)
2783 for (v = vars; v; v = TREE_CHAIN (v))
2785 tree var = TREE_VALUE (v);
2786 if (!var_finalized_p (var))
2788 import_export_decl (var);
2789 rest_of_decl_compilation (var, 1, 1);
2794 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2795 (otherwise) that will initialize all gobal objects with static
2796 storage duration having the indicated PRIORITY. */
2799 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2808 input_location = *locus;
2809 #ifdef USE_MAPPED_LOCATION
2815 /* We use `I' to indicate initialization and `D' to indicate
2817 function_key = constructor_p ? 'I' : 'D';
2819 /* We emit the function lazily, to avoid generating empty
2820 global constructors and destructors. */
2823 /* For Objective-C++, we may need to initialize metadata found in this module.
2824 This must be done _before_ any other static initializations. */
2825 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2826 && constructor_p && objc_static_init_needed_p ())
2828 body = start_objects (function_key, priority);
2829 static_ctors = objc_generate_static_init_call (static_ctors);
2832 /* Call the static storage duration function with appropriate
2834 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2836 /* Calls to pure or const functions will expand to nothing. */
2837 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2840 body = start_objects (function_key, priority);
2842 arguments = tree_cons (NULL_TREE,
2843 build_int_cst (NULL_TREE, priority),
2845 arguments = tree_cons (NULL_TREE,
2846 build_int_cst (NULL_TREE, constructor_p),
2848 finish_expr_stmt (build_function_call (fndecl, arguments));
2852 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2853 calls to any functions marked with attributes indicating that
2854 they should be called at initialization- or destruction-time. */
2855 if (priority == DEFAULT_INIT_PRIORITY)
2859 for (fns = constructor_p ? static_ctors : static_dtors;
2861 fns = TREE_CHAIN (fns))
2863 fndecl = TREE_VALUE (fns);
2865 /* Calls to pure/const functions will expand to nothing. */
2866 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2869 body = start_objects (function_key, priority);
2870 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2875 /* Close out the function. */
2877 finish_objects (function_key, priority, body);
2880 /* Generate constructor and destructor functions for the priority
2884 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2886 location_t *locus = (location_t *) data;
2887 int priority = (int) n->key;
2888 priority_info pi = (priority_info) n->value;
2890 /* Generate the functions themselves, but only if they are really
2892 if (pi->initializations_p
2893 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2894 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2895 if (pi->destructions_p
2896 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2897 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2899 /* Keep iterating. */
2903 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2904 decls referenced from frontend specific constructs; it will be called
2905 only for language-specific tree nodes.
2907 Here we must deal with member pointers. */
2910 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2911 tree from ATTRIBUTE_UNUSED)
2915 switch (TREE_CODE (t))
2918 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2919 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2922 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2923 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2926 if (DECL_VTABLE_OR_VTT_P (t))
2928 /* The ABI requires that all virtual tables be emitted
2929 whenever one of them is. */
2931 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2933 vtbl = TREE_CHAIN (vtbl))
2934 mark_decl_referenced (vtbl);
2936 else if (DECL_CONTEXT (t)
2937 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2938 /* If we need a static variable in a function, then we
2939 need the containing function. */
2940 mark_decl_referenced (DECL_CONTEXT (t));
2949 /* Java requires that we be able to reference a local address for a
2950 method, and not be confused by PLT entries. If hidden aliases are
2951 supported, emit one for each java function that we've emitted. */
2954 build_java_method_aliases (void)
2956 struct cgraph_node *node;
2958 #ifndef HAVE_GAS_HIDDEN
2962 for (node = cgraph_nodes; node ; node = node->next)
2964 tree fndecl = node->decl;
2966 if (TREE_ASM_WRITTEN (fndecl)
2967 && DECL_CONTEXT (fndecl)
2968 && TYPE_P (DECL_CONTEXT (fndecl))
2969 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2970 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
2972 /* Mangle the name in a predictable way; we need to reference
2973 this from a java compiled object file. */
2974 tree oid, nid, alias;
2978 oid = DECL_ASSEMBLER_NAME (fndecl);
2979 oname = IDENTIFIER_POINTER (oid);
2980 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
2981 nname = ACONCAT (("_ZGA", oname+2, NULL));
2982 nid = get_identifier (nname);
2984 alias = make_alias_for (fndecl, nid);
2985 TREE_PUBLIC (alias) = 1;
2986 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
2988 assemble_alias (alias, oid);
2993 /* This routine is called from the last rule in yyparse ().
2994 Its job is to create all the code needed to initialize and
2995 destroy the global aggregates. We do the destruction
2996 first, since that way we only need to reverse the decls once. */
2999 cp_finish_file (void)
3005 unsigned ssdf_count = 0;
3009 locus = input_location;
3012 /* Bad parse errors. Just forget about it. */
3013 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3017 c_common_write_pch ();
3019 #ifdef USE_MAPPED_LOCATION
3022 /* Otherwise, GDB can get confused, because in only knows
3023 about source for LINENO-1 lines. */
3027 /* We now have to write out all the stuff we put off writing out.
3030 o Template specializations that we have not yet instantiated,
3031 but which are needed.
3032 o Initialization and destruction for non-local objects with
3033 static storage duration. (Local objects with static storage
3034 duration are initialized when their scope is first entered,
3035 and are cleaned up via atexit.)
3036 o Virtual function tables.
3038 All of these may cause others to be needed. For example,
3039 instantiating one function may cause another to be needed, and
3040 generating the initializer for an object may cause templates to be
3041 instantiated, etc., etc. */
3043 timevar_push (TV_VARCONST);
3045 emit_support_tinfos ();
3054 /* If there are templates that we've put off instantiating, do
3056 instantiate_pending_templates (retries);
3059 /* Write out virtual tables as required. Note that writing out
3060 the virtual table for a template class may cause the
3061 instantiation of members of that class. If we write out
3062 vtables then we remove the class from our list so we don't
3063 have to look at it again. */
3065 while (keyed_classes != NULL_TREE
3066 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3069 keyed_classes = TREE_CHAIN (keyed_classes);
3075 tree next = TREE_CHAIN (t);
3079 if (maybe_emit_vtables (TREE_VALUE (next)))
3082 TREE_CHAIN (t) = TREE_CHAIN (next);
3087 next = TREE_CHAIN (t);
3091 /* Write out needed type info variables. We have to be careful
3092 looping through unemitted decls, because emit_tinfo_decl may
3093 cause other variables to be needed. New elements will be
3094 appended, and we remove from the vector those that actually
3096 for (i = VEC_length (tree, unemitted_tinfo_decls);
3097 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3098 if (emit_tinfo_decl (t))
3101 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3104 /* The list of objects with static storage duration is built up
3105 in reverse order. We clear STATIC_AGGREGATES so that any new
3106 aggregates added during the initialization of these will be
3107 initialized in the correct order when we next come around the
3109 vars = prune_vars_needing_no_initialization (&static_aggregates);
3113 /* We need to start a new initialization function each time
3114 through the loop. That's because we need to know which
3115 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3116 isn't computed until a function is finished, and written
3117 out. That's a deficiency in the back-end. When this is
3118 fixed, these initialization functions could all become
3119 inline, with resulting performance improvements. */
3122 /* Set the line and file, so that it is obviously not from
3124 input_location = locus;
3125 ssdf_body = start_static_storage_duration_function (ssdf_count);
3127 /* Make sure the back end knows about all the variables. */
3128 write_out_vars (vars);
3130 /* First generate code to do all the initializations. */
3132 do_static_initialization_or_destruction (vars, /*initp=*/true);
3134 /* Then, generate code to do all the destructions. Do these
3135 in reverse order so that the most recently constructed
3136 variable is the first destroyed. If we're using
3137 __cxa_atexit, then we don't need to do this; functions
3138 were registered at initialization time to destroy the
3140 if (!flag_use_cxa_atexit && vars)
3142 vars = nreverse (vars);
3143 do_static_initialization_or_destruction (vars, /*initp=*/false);
3148 /* Finish up the static storage duration function for this
3150 input_location = locus;
3151 finish_static_storage_duration_function (ssdf_body);
3153 /* All those initializations and finalizations might cause
3154 us to need more inline functions, more template
3155 instantiations, etc. */
3158 #ifdef USE_MAPPED_LOCATION
3165 /* Go through the set of inline functions whose bodies have not
3166 been emitted yet. If out-of-line copies of these functions
3167 are required, emit them. */
3168 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3170 /* Does it need synthesizing? */
3171 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3172 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3174 /* Even though we're already at the top-level, we push
3175 there again. That way, when we pop back a few lines
3176 hence, all of our state is restored. Otherwise,
3177 finish_function doesn't clean things up, and we end
3178 up with CURRENT_FUNCTION_DECL set. */
3179 push_to_top_level ();
3180 /* The decl's location will mark where it was first
3181 needed. Save that so synthesize method can indicate
3182 where it was needed from, in case of error */
3183 input_location = DECL_SOURCE_LOCATION (decl);
3184 synthesize_method (decl);
3185 pop_from_top_level ();
3189 if (!DECL_SAVED_TREE (decl))
3192 /* We lie to the back-end, pretending that some functions
3193 are not defined when they really are. This keeps these
3194 functions from being put out unnecessarily. But, we must
3195 stop lying when the functions are referenced, or if they
3196 are not comdat since they need to be put out now. If
3197 DECL_INTERFACE_KNOWN, then we have already set
3198 DECL_EXTERNAL appropriately, so there's no need to check
3199 again, and we do not want to clear DECL_EXTERNAL if a
3200 previous call to import_export_decl set it.
3202 This is done in a separate for cycle, because if some
3203 deferred function is contained in another deferred
3204 function later in deferred_fns varray,
3205 rest_of_compilation would skip this function and we
3206 really cannot expand the same function twice. */
3207 import_export_decl (decl);
3208 if (DECL_NOT_REALLY_EXTERN (decl)
3209 && DECL_INITIAL (decl)
3210 && decl_needed_p (decl))
3211 DECL_EXTERNAL (decl) = 0;
3213 /* If we're going to need to write this function out, and
3214 there's already a body for it, create RTL for it now.
3215 (There might be no body if this is a method we haven't
3216 gotten around to synthesizing yet.) */
3217 if (!DECL_EXTERNAL (decl)
3218 && decl_needed_p (decl)
3219 && !TREE_ASM_WRITTEN (decl)
3220 && !cgraph_node (decl)->local.finalized)
3222 /* We will output the function; no longer consider it in this
3224 DECL_DEFER_OUTPUT (decl) = 0;
3225 /* Generate RTL for this function now that we know we
3227 expand_or_defer_fn (decl);
3228 /* If we're compiling -fsyntax-only pretend that this
3229 function has been written out so that we don't try to
3231 if (flag_syntax_only)
3232 TREE_ASM_WRITTEN (decl) = 1;
3237 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3240 /* Static data members are just like namespace-scope globals. */
3241 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3243 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3245 import_export_decl (decl);
3246 /* If this static data member is needed, provide it to the
3248 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3249 DECL_EXTERNAL (decl) = 0;
3251 if (VEC_length (tree, pending_statics) != 0
3252 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3253 VEC_length (tree, pending_statics)))
3260 /* All used inline functions must have a definition at this point. */
3261 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3263 if (/* Check online inline functions that were actually used. */
3264 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3265 /* If the definition actually was available here, then the
3266 fact that the function was not defined merely represents
3267 that for some reason (use of a template repository,
3268 #pragma interface, etc.) we decided not to emit the
3270 && !DECL_INITIAL (decl)
3271 /* An explicit instantiation can be used to specify
3272 that the body is in another unit. It will have
3273 already verified there was a definition. */
3274 && !DECL_EXPLICIT_INSTANTIATION (decl))
3276 warning (0, "inline function %q+D used but never defined", decl);
3277 /* Avoid a duplicate warning from check_global_declaration_1. */
3278 TREE_NO_WARNING (decl) = 1;
3282 /* We give C linkage to static constructors and destructors. */
3283 push_lang_context (lang_name_c);
3285 /* Generate initialization and destruction functions for all
3286 priorities for which they are required. */
3287 if (priority_info_map)
3288 splay_tree_foreach (priority_info_map,
3289 generate_ctor_and_dtor_functions_for_priority,
3293 /* If we have a ctor or this is obj-c++ and we need a static init,
3294 call generate_ctor_or_dtor_function. */
3295 if (static_ctors || (c_dialect_objc () && objc_static_init_needed_p ()))
3296 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3297 DEFAULT_INIT_PRIORITY, &locus);
3299 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3300 DEFAULT_INIT_PRIORITY, &locus);
3303 /* We're done with the splay-tree now. */
3304 if (priority_info_map)
3305 splay_tree_delete (priority_info_map);
3307 /* Generate any missing aliases. */
3308 maybe_apply_pending_pragma_weaks ();
3310 /* We're done with static constructors, so we can go back to "C++"
3312 pop_lang_context ();
3314 cgraph_finalize_compilation_unit ();
3317 /* Now, issue warnings about static, but not defined, functions,
3318 etc., and emit debugging information. */
3319 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3320 if (VEC_length (tree, pending_statics) != 0)
3322 check_global_declarations (VEC_address (tree, pending_statics),
3323 VEC_length (tree, pending_statics));
3324 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3325 VEC_length (tree, pending_statics));
3328 /* Generate hidden aliases for Java. */
3329 build_java_method_aliases ();
3333 /* The entire file is now complete. If requested, dump everything
3337 FILE *stream = dump_begin (TDI_tu, &flags);
3341 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3342 dump_end (TDI_tu, stream);
3346 timevar_pop (TV_VARCONST);
3348 if (flag_detailed_statistics)
3350 dump_tree_statistics ();
3351 dump_time_statistics ();
3353 input_location = locus;
3355 #ifdef ENABLE_CHECKING
3356 validate_conversion_obstack ();
3357 #endif /* ENABLE_CHECKING */
3360 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3361 function to call in parse-tree form; it has not yet been
3362 semantically analyzed. ARGS are the arguments to the function.
3363 They have already been semantically analyzed. */
3366 build_offset_ref_call_from_tree (tree fn, tree args)
3375 object = TREE_OPERAND (fn, 0);
3377 if (processing_template_decl)
3379 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3380 || TREE_CODE (fn) == MEMBER_REF);
3381 if (type_dependent_expression_p (fn)
3382 || any_type_dependent_arguments_p (args))
3383 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3385 /* Transform the arguments and add the implicit "this"
3386 parameter. That must be done before the FN is transformed
3387 because we depend on the form of FN. */
3388 args = build_non_dependent_args (args);
3389 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3390 object = build_unary_op (ADDR_EXPR, object, 0);
3391 object = build_non_dependent_expr (object);
3392 args = tree_cons (NULL_TREE, object, args);
3393 /* Now that the arguments are done, transform FN. */
3394 fn = build_non_dependent_expr (fn);
3397 /* A qualified name corresponding to a bound pointer-to-member is
3398 represented as an OFFSET_REF:
3400 struct B { void g(); };
3402 void B::g() { (this->*p)(); } */
3403 if (TREE_CODE (fn) == OFFSET_REF)
3405 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3406 fn = TREE_OPERAND (fn, 1);
3407 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3408 args = tree_cons (NULL_TREE, object_addr, args);
3411 expr = build_function_call (fn, args);
3412 if (processing_template_decl && expr != error_mark_node)
3413 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3419 check_default_args (tree x)
3421 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3422 bool saw_def = false;
3423 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3424 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3426 if (TREE_PURPOSE (arg))
3430 error ("default argument missing for parameter %P of %q+#D", i, x);
3431 TREE_PURPOSE (arg) = error_mark_node;
3436 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3437 If DECL is a specialization or implicitly declared class member,
3438 generate the actual definition. */
3441 mark_used (tree decl)
3443 HOST_WIDE_INT saved_processing_template_decl = 0;
3445 /* If DECL is a BASELINK for a single function, then treat it just
3446 like the DECL for the function. Otherwise, if the BASELINK is
3447 for an overloaded function, we don't know which function was
3448 actually used until after overload resolution. */
3449 if (TREE_CODE (decl) == BASELINK)
3451 decl = BASELINK_FUNCTIONS (decl);
3452 if (really_overloaded_fn (decl))
3454 decl = OVL_CURRENT (decl);
3457 TREE_USED (decl) = 1;
3458 /* If we don't need a value, then we don't need to synthesize DECL. */
3459 if (skip_evaluation)
3461 /* Normally, we can wait until instantiation-time to synthesize
3462 DECL. However, if DECL is a static data member initialized with
3463 a constant, we need the value right now because a reference to
3464 such a data member is not value-dependent. */
3465 if (TREE_CODE (decl) == VAR_DECL
3466 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3467 && DECL_CLASS_SCOPE_P (decl))
3469 /* Don't try to instantiate members of dependent types. We
3470 cannot just use dependent_type_p here because this function
3471 may be called from fold_non_dependent_expr, and then we may
3472 see dependent types, even though processing_template_decl
3474 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3475 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3477 /* Pretend that we are not in a template, even if we are, so
3478 that the static data member initializer will be processed. */
3479 saved_processing_template_decl = processing_template_decl;
3480 processing_template_decl = 0;
3483 if (processing_template_decl)
3486 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3487 && !TREE_ASM_WRITTEN (decl))
3488 /* Remember it, so we can check it was defined. */
3490 if (DECL_DEFERRED_FN (decl))
3493 /* Remember the current location for a function we will end up
3494 synthesizing. Then we can inform the user where it was
3495 required in the case of error. */
3496 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3497 && !DECL_THUNK_P (decl))
3498 DECL_SOURCE_LOCATION (decl) = input_location;
3500 note_vague_linkage_fn (decl);
3503 assemble_external (decl);
3505 /* Is it a synthesized method that needs to be synthesized? */
3506 if (TREE_CODE (decl) == FUNCTION_DECL
3507 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3508 && DECL_ARTIFICIAL (decl)
3509 && !DECL_THUNK_P (decl)
3510 && ! DECL_INITIAL (decl)
3511 /* Kludge: don't synthesize for default args. Unfortunately this
3512 rules out initializers of namespace-scoped objects too, but
3513 it's sort-of ok if the implicit ctor or dtor decl keeps
3514 pointing to the class location. */
3515 && current_function_decl)
3517 synthesize_method (decl);
3518 /* If we've already synthesized the method we don't need to
3519 do the instantiation test below. */
3521 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3522 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3523 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3524 || (TREE_CODE (decl) == FUNCTION_DECL
3525 && DECL_INLINE (DECL_TEMPLATE_RESULT
3526 (template_for_substitution (decl))))
3527 /* We need to instantiate static data members so that there
3528 initializers are available in integral constant
3530 || (TREE_CODE (decl) == VAR_DECL
3531 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3532 /* If this is a function or variable that is an instance of some
3533 template, we now know that we will need to actually do the
3534 instantiation. We check that DECL is not an explicit
3535 instantiation because that is not checked in instantiate_decl.
3537 We put off instantiating functions in order to improve compile
3538 times. Maintaining a stack of active functions is expensive,
3539 and the inliner knows to instantiate any functions it might
3540 need. Therefore, we always try to defer instantiation. */
3541 instantiate_decl (decl, /*defer_ok=*/true,
3542 /*expl_inst_class_mem_p=*/false);
3544 processing_template_decl = saved_processing_template_decl;
3547 #include "gt-cp-decl2.h"