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
1001 || *decl == error_mark_node)
1004 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1005 decl = &DECL_TEMPLATE_RESULT (*decl);
1007 decl_attributes (decl, attributes, flags);
1009 if (TREE_CODE (*decl) == TYPE_DECL)
1010 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1013 /* Walks through the namespace- or function-scope anonymous union
1014 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1015 Returns one of the fields for use in the mangled name. */
1018 build_anon_union_vars (tree type, tree object)
1020 tree main_decl = NULL_TREE;
1023 /* Rather than write the code to handle the non-union case,
1024 just give an error. */
1025 if (TREE_CODE (type) != UNION_TYPE)
1026 error ("anonymous struct not inside named type");
1028 for (field = TYPE_FIELDS (type);
1030 field = TREE_CHAIN (field))
1035 if (DECL_ARTIFICIAL (field))
1037 if (TREE_CODE (field) != FIELD_DECL)
1039 pedwarn ("%q+#D invalid; an anonymous union can only "
1040 "have non-static data members", field);
1044 if (TREE_PRIVATE (field))
1045 pedwarn ("private member %q+#D in anonymous union", field);
1046 else if (TREE_PROTECTED (field))
1047 pedwarn ("protected member %q+#D in anonymous union", field);
1049 if (processing_template_decl)
1050 ref = build_min_nt (COMPONENT_REF, object,
1051 DECL_NAME (field), NULL_TREE);
1053 ref = build_class_member_access_expr (object, field, NULL_TREE,
1056 if (DECL_NAME (field))
1060 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1062 base = get_base_address (object);
1063 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1064 TREE_STATIC (decl) = TREE_STATIC (base);
1065 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1067 SET_DECL_VALUE_EXPR (decl, ref);
1068 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1070 decl = pushdecl (decl);
1072 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1073 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1077 if (main_decl == NULL_TREE)
1084 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1085 anonymous union, then all members must be laid out together. PUBLIC_P
1086 is nonzero if this union is not declared static. */
1089 finish_anon_union (tree anon_union_decl)
1095 if (anon_union_decl == error_mark_node)
1098 type = TREE_TYPE (anon_union_decl);
1099 public_p = TREE_PUBLIC (anon_union_decl);
1101 /* The VAR_DECL's context is the same as the TYPE's context. */
1102 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1104 if (TYPE_FIELDS (type) == NULL_TREE)
1109 error ("namespace-scope anonymous aggregates must be static");
1113 main_decl = build_anon_union_vars (type, anon_union_decl);
1114 if (main_decl == error_mark_node)
1116 if (main_decl == NULL_TREE)
1118 warning (0, "anonymous union with no members");
1122 if (!processing_template_decl)
1124 /* Use main_decl to set the mangled name. */
1125 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1126 mangle_decl (anon_union_decl);
1127 DECL_NAME (anon_union_decl) = NULL_TREE;
1130 pushdecl (anon_union_decl);
1131 if (building_stmt_tree ()
1132 && at_function_scope_p ())
1133 add_decl_expr (anon_union_decl);
1134 else if (!processing_template_decl)
1135 rest_of_decl_compilation (anon_union_decl,
1136 toplevel_bindings_p (), at_eof);
1139 /* Auxiliary functions to make type signatures for
1140 `operator new' and `operator delete' correspond to
1141 what compiler will be expecting. */
1144 coerce_new_type (tree type)
1147 tree args = TYPE_ARG_TYPES (type);
1149 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1151 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1154 error ("%<operator new%> must return type %qT", ptr_type_node);
1157 if (!args || args == void_list_node
1158 || !same_type_p (TREE_VALUE (args), size_type_node))
1161 if (args && args != void_list_node)
1162 args = TREE_CHAIN (args);
1163 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1164 "as first parameter", size_type_node);
1169 args = tree_cons (NULL_TREE, size_type_node, args);
1172 type = build_exception_variant
1173 (build_function_type (ptr_type_node, args),
1174 TYPE_RAISES_EXCEPTIONS (type));
1182 coerce_delete_type (tree type)
1185 tree args = TYPE_ARG_TYPES (type);
1187 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1189 if (!same_type_p (TREE_TYPE (type), void_type_node))
1192 error ("%<operator delete%> must return type %qT", void_type_node);
1195 if (!args || args == void_list_node
1196 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1199 if (args && args != void_list_node)
1200 args = TREE_CHAIN (args);
1201 error ("%<operator delete%> takes type %qT as first parameter",
1207 args = tree_cons (NULL_TREE, ptr_type_node, args);
1210 type = build_exception_variant
1211 (build_function_type (void_type_node, args),
1212 TYPE_RAISES_EXCEPTIONS (type));
1221 mark_vtable_entries (tree decl)
1224 unsigned HOST_WIDE_INT idx;
1226 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1231 STRIP_NOPS (fnaddr);
1233 if (TREE_CODE (fnaddr) != ADDR_EXPR
1234 && TREE_CODE (fnaddr) != FDESC_EXPR)
1235 /* This entry is an offset: a virtual base class offset, a
1236 virtual call offset, an RTTI offset, etc. */
1239 fn = TREE_OPERAND (fnaddr, 0);
1240 TREE_ADDRESSABLE (fn) = 1;
1241 /* When we don't have vcall offsets, we output thunks whenever
1242 we output the vtables that contain them. With vcall offsets,
1243 we know all the thunks we'll need when we emit a virtual
1244 function, so we emit the thunks there instead. */
1245 if (DECL_THUNK_P (fn))
1246 use_thunk (fn, /*emit_p=*/0);
1251 /* Set DECL up to have the closest approximation of "initialized common"
1252 linkage available. */
1255 comdat_linkage (tree decl)
1258 make_decl_one_only (decl);
1259 else if (TREE_CODE (decl) == FUNCTION_DECL
1260 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1261 /* We can just emit function and compiler-generated variables
1262 statically; having multiple copies is (for the most part) only
1265 There are two correctness issues, however: the address of a
1266 template instantiation with external linkage should be the
1267 same, independent of what translation unit asks for the
1268 address, and this will not hold when we emit multiple copies of
1269 the function. However, there's little else we can do.
1271 Also, by default, the typeinfo implementation assumes that
1272 there will be only one copy of the string used as the name for
1273 each type. Therefore, if weak symbols are unavailable, the
1274 run-time library should perform a more conservative check; it
1275 should perform a string comparison, rather than an address
1277 TREE_PUBLIC (decl) = 0;
1280 /* Static data member template instantiations, however, cannot
1281 have multiple copies. */
1282 if (DECL_INITIAL (decl) == 0
1283 || DECL_INITIAL (decl) == error_mark_node)
1284 DECL_COMMON (decl) = 1;
1285 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1287 DECL_COMMON (decl) = 1;
1288 DECL_INITIAL (decl) = error_mark_node;
1290 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1292 /* We can't do anything useful; leave vars for explicit
1294 DECL_EXTERNAL (decl) = 1;
1295 DECL_NOT_REALLY_EXTERN (decl) = 0;
1299 if (DECL_LANG_SPECIFIC (decl))
1300 DECL_COMDAT (decl) = 1;
1303 /* For win32 we also want to put explicit instantiations in
1304 linkonce sections, so that they will be merged with implicit
1305 instantiations; otherwise we get duplicate symbol errors.
1306 For Darwin we do not want explicit instantiations to be
1310 maybe_make_one_only (tree decl)
1312 /* We used to say that this was not necessary on targets that support weak
1313 symbols, because the implicit instantiations will defer to the explicit
1314 one. However, that's not actually the case in SVR4; a strong definition
1315 after a weak one is an error. Also, not making explicit
1316 instantiations one_only means that we can end up with two copies of
1317 some template instantiations. */
1321 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1322 we can get away with not emitting them if they aren't used. We need
1323 to for variables so that cp_finish_decl will update their linkage,
1324 because their DECL_INITIAL may not have been set properly yet. */
1326 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1327 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1328 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1330 make_decl_one_only (decl);
1332 if (TREE_CODE (decl) == VAR_DECL)
1334 DECL_COMDAT (decl) = 1;
1335 /* Mark it needed so we don't forget to emit it. */
1336 mark_decl_referenced (decl);
1341 /* Determine whether or not we want to specifically import or export CTYPE,
1342 using various heuristics. */
1345 import_export_class (tree ctype)
1347 /* -1 for imported, 1 for exported. */
1348 int import_export = 0;
1350 /* It only makes sense to call this function at EOF. The reason is
1351 that this function looks at whether or not the first non-inline
1352 non-abstract virtual member function has been defined in this
1353 translation unit. But, we can't possibly know that until we've
1354 seen the entire translation unit. */
1355 gcc_assert (at_eof);
1357 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1360 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1361 we will have CLASSTYPE_INTERFACE_ONLY set but not
1362 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1363 heuristic because someone will supply a #pragma implementation
1364 elsewhere, and deducing it here would produce a conflict. */
1365 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1368 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1370 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1372 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1373 && !flag_implicit_templates)
1374 /* For a template class, without -fimplicit-templates, check the
1375 repository. If the virtual table is assigned to this
1376 translation unit, then export the class; otherwise, import
1378 import_export = repo_export_class_p (ctype) ? 1 : -1;
1379 else if (TYPE_POLYMORPHIC_P (ctype))
1381 /* The ABI specifies that the virtual table and associated
1382 information are emitted with the key method, if any. */
1383 tree method = CLASSTYPE_KEY_METHOD (ctype);
1384 /* If weak symbol support is not available, then we must be
1385 careful not to emit the vtable when the key function is
1386 inline. An inline function can be defined in multiple
1387 translation units. If we were to emit the vtable in each
1388 translation unit containing a definition, we would get
1389 multiple definition errors at link-time. */
1390 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1391 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1394 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1395 a definition anywhere else. */
1396 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1399 /* Allow backends the chance to overrule the decision. */
1400 if (targetm.cxx.import_export_class)
1401 import_export = targetm.cxx.import_export_class (ctype, import_export);
1405 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1406 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1410 /* Return true if VAR has already been provided to the back end; in that
1411 case VAR should not be modified further by the front end. */
1413 var_finalized_p (tree var)
1415 return cgraph_varpool_node (var)->finalized;
1418 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1419 must be emitted in this translation unit. Mark it as such. */
1422 mark_needed (tree decl)
1424 /* It's possible that we no longer need to set
1425 TREE_SYMBOL_REFERENCED here directly, but doing so is
1427 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1428 mark_decl_referenced (decl);
1431 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1432 returns true if a definition of this entity should be provided in
1433 this object file. Callers use this function to determine whether
1434 or not to let the back end know that a definition of DECL is
1435 available in this translation unit. */
1438 decl_needed_p (tree decl)
1440 gcc_assert (TREE_CODE (decl) == VAR_DECL
1441 || TREE_CODE (decl) == FUNCTION_DECL);
1442 /* This function should only be called at the end of the translation
1443 unit. We cannot be sure of whether or not something will be
1444 COMDAT until that point. */
1445 gcc_assert (at_eof);
1447 /* All entities with external linkage that are not COMDAT should be
1448 emitted; they may be referred to from other object files. */
1449 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1451 /* If this entity was used, let the back-end see it; it will decide
1452 whether or not to emit it into the object file. */
1453 if (TREE_USED (decl)
1454 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1455 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1457 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1458 reference to DECL might cause it to be emitted later. */
1462 /* If necessary, write out the vtables for the dynamic class CTYPE.
1463 Returns true if any vtables were emitted. */
1466 maybe_emit_vtables (tree ctype)
1472 /* If the vtables for this class have already been emitted there is
1473 nothing more to do. */
1474 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1475 if (var_finalized_p (primary_vtbl))
1477 /* Ignore dummy vtables made by get_vtable_decl. */
1478 if (TREE_TYPE (primary_vtbl) == void_type_node)
1481 /* On some targets, we cannot determine the key method until the end
1482 of the translation unit -- which is when this function is
1484 if (!targetm.cxx.key_method_may_be_inline ())
1485 determine_key_method (ctype);
1487 /* See if any of the vtables are needed. */
1488 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1490 import_export_decl (vtbl);
1491 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1496 /* If the references to this class' vtables are optimized away,
1497 still emit the appropriate debugging information. See
1499 if (DECL_COMDAT (primary_vtbl)
1500 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1501 note_debug_info_needed (ctype);
1505 /* The ABI requires that we emit all of the vtables if we emit any
1507 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1509 /* Mark entities references from the virtual table as used. */
1510 mark_vtable_entries (vtbl);
1512 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1514 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1516 /* It had better be all done at compile-time. */
1521 DECL_EXTERNAL (vtbl) = 0;
1522 rest_of_decl_compilation (vtbl, 1, 1);
1524 /* Because we're only doing syntax-checking, we'll never end up
1525 actually marking the variable as written. */
1526 if (flag_syntax_only)
1527 TREE_ASM_WRITTEN (vtbl) = 1;
1530 /* Since we're writing out the vtable here, also write the debug
1532 note_debug_info_needed (ctype);
1537 /* A special return value from type_visibility meaning internal
1540 enum { VISIBILITY_STATIC = VISIBILITY_INTERNAL+1 };
1542 /* walk_tree helper function for type_visibility. */
1545 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1547 int *vis_p = (int *)data;
1552 else if (CLASS_TYPE_P (*tp))
1554 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1556 *vis_p = VISIBILITY_STATIC;
1559 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1560 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1565 /* Returns the visibility of TYPE, which is the minimum visibility of its
1569 type_visibility (tree type)
1571 int vis = VISIBILITY_DEFAULT;
1572 walk_tree_without_duplicates (&type, min_vis_r, &vis);
1576 /* Limit the visibility of DECL to VISIBILITY. SPECIFIED is true if the
1577 constraint comes from an attribute or pragma; REASON is the source of
1581 constrain_visibility (tree decl, int visibility, bool specified,
1584 if (visibility == VISIBILITY_STATIC)
1586 TREE_PUBLIC (decl) = 0;
1587 DECL_INTERFACE_KNOWN (decl) = 1;
1588 if (DECL_LANG_SPECIFIC (decl))
1589 DECL_NOT_REALLY_EXTERN (decl) = 1;
1591 else if (visibility > DECL_VISIBILITY (decl))
1593 if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)))
1594 warning (OPT_Wattributes, "%q+D: visibility attribute requests "
1595 "greater visibility than its %s allows", decl, reason);
1596 DECL_VISIBILITY (decl) = visibility;
1597 if (!DECL_VISIBILITY_SPECIFIED (decl))
1598 DECL_VISIBILITY_SPECIFIED (decl) = specified;
1604 /* Constrain the visibility of DECL based on the visibility of its template
1608 constrain_visibility_for_template (tree decl, tree targs)
1610 /* If this is a template instantiation, check the innermost
1611 template args for visibility constraints. The outer template
1612 args are covered by the class check. */
1613 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1615 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1619 tree arg = TREE_VEC_ELT (args, i-1);
1621 vis = type_visibility (arg);
1622 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1625 if (TREE_CODE (arg) == ADDR_EXPR)
1626 arg = TREE_OPERAND (arg, 0);
1627 if (TREE_CODE (arg) == VAR_DECL
1628 || TREE_CODE (arg) == FUNCTION_DECL)
1630 if (! TREE_PUBLIC (arg))
1631 vis = VISIBILITY_STATIC;
1633 vis = DECL_VISIBILITY (arg);
1637 constrain_visibility (decl, vis, false, "template parameter");
1641 /* Like c_determine_visibility, but with additional C++-specific
1644 Function-scope entities can rely on the function's visibility because
1645 it is set in start_preparsed_function.
1647 Class-scope entities cannot rely on the class's visibility until the end
1648 of the enclosing class definition.
1650 Note that because namespaces have multiple independent definitions,
1651 namespace visibility is handled elsewhere using the #pragma visibility
1652 machinery rather than by decorating the namespace declaration.
1654 The goal is for constraints from the type to give a diagnostic, and
1655 other constraints to be applied silently. */
1658 determine_visibility (tree decl)
1660 tree class_type = NULL_TREE;
1663 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1665 /* Only relevant for names with external linkage. */
1666 if (!TREE_PUBLIC (decl))
1669 /* Cloned constructors and destructors get the same visibility as
1670 the underlying function. That should be set up in
1671 maybe_clone_body. */
1672 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1674 if (TREE_CODE (decl) == TYPE_DECL)
1676 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1677 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1678 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1683 else if (DECL_LANG_SPECIFIC (decl))
1684 use_template = DECL_USE_TEMPLATE (decl);
1688 /* Anything that is exported must have default visibility. */
1689 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1690 && lookup_attribute ("dllexport",
1691 TREE_CODE (decl) == TYPE_DECL
1692 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
1693 : DECL_ATTRIBUTES (decl)))
1695 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1696 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1699 /* If DECL is a member of a class, visibility specifiers on the
1700 class can influence the visibility of the DECL. */
1701 if (DECL_CLASS_SCOPE_P (decl))
1702 class_type = DECL_CONTEXT (decl);
1703 else if (TREE_CODE (decl) == VAR_DECL
1704 && DECL_TINFO_P (decl)
1705 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1706 class_type = TREE_TYPE (DECL_NAME (decl));
1709 /* Not a class member. */
1711 /* Virtual tables have DECL_CONTEXT set to their associated class,
1712 so they are automatically handled above. */
1713 gcc_assert (TREE_CODE (decl) != VAR_DECL
1714 || !DECL_VTABLE_OR_VTT_P (decl));
1716 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1718 /* Local statics and classes get the visibility of their
1719 containing function by default, except that
1720 -fvisibility-inlines-hidden doesn't affect them. */
1721 tree fn = DECL_CONTEXT (decl);
1722 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1724 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1725 DECL_VISIBILITY_SPECIFIED (decl) =
1726 DECL_VISIBILITY_SPECIFIED (fn);
1729 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1731 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1732 but have no TEMPLATE_INFO, so don't try to check it. */
1735 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1737 /* tinfo visibility is based on the type it's for. */
1738 constrain_visibility
1739 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))),
1742 else if (use_template)
1743 /* Template instantiations and specializations get visibility based
1744 on their template unless they override it with an attribute. */;
1745 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1747 /* Set default visibility to whatever the user supplied with
1748 #pragma GCC visibility or a namespace visibility attribute. */
1749 DECL_VISIBILITY (decl) = default_visibility;
1750 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1756 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1757 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1758 : DECL_TEMPLATE_INFO (decl));
1759 tree args = TI_ARGS (tinfo);
1760 int depth = TMPL_ARGS_DEPTH (args);
1762 /* If the template has explicit visibility and the specialization
1763 doesn't, use the visibility from the template. */
1764 if (!DECL_VISIBILITY_SPECIFIED (decl))
1766 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1767 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1770 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1771 if (args && depth > template_class_depth (class_type))
1772 /* Don't let it have more visibility than its template type
1774 constrain_visibility_for_template (decl, args);
1778 determine_visibility_from_class (decl, class_type);
1780 /* Don't let it have more visibility than its type. */
1781 if (TREE_CODE (decl) != TYPE_DECL)
1782 if (constrain_visibility (decl, type_visibility (TREE_TYPE (decl)),
1784 warning (OPT_Wattributes, "\
1785 %q+D declared with greater visibility than its type",
1788 if (decl_anon_ns_mem_p (decl))
1789 /* Names in an anonymous namespace get internal linkage.
1790 This might change once we implement export. */
1791 constrain_visibility (decl, VISIBILITY_STATIC,
1792 false, "namespace");
1795 /* By default, static data members and function members receive
1796 the visibility of their containing class. */
1799 determine_visibility_from_class (tree decl, tree class_type)
1801 if (visibility_options.inlines_hidden
1802 /* Don't do this for inline templates; specializations might not be
1803 inline, and we don't want them to inherit the hidden
1804 visibility. We'll set it here for all inline instantiations. */
1805 && !processing_template_decl
1806 && ! DECL_VISIBILITY_SPECIFIED (decl)
1807 && TREE_CODE (decl) == FUNCTION_DECL
1808 && DECL_DECLARED_INLINE_P (decl))
1809 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1811 /* The decl can't have more visibility than its class. */
1812 constrain_visibility (decl, CLASSTYPE_VISIBILITY (class_type),
1813 CLASSTYPE_VISIBILITY_SPECIFIED (class_type),
1816 /* Give the target a chance to override the visibility associated
1818 if (TREE_CODE (decl) == VAR_DECL
1819 && (DECL_TINFO_P (decl)
1820 || (DECL_VTABLE_OR_VTT_P (decl)
1821 /* Construction virtual tables are not exported because
1822 they cannot be referred to from other object files;
1823 their name is not standardized by the ABI. */
1824 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1825 && TREE_PUBLIC (decl)
1826 && !DECL_REALLY_EXTERN (decl)
1827 && DECL_VISIBILITY_SPECIFIED (decl)
1828 && (!class_type || !CLASSTYPE_VISIBILITY_SPECIFIED (class_type)))
1829 targetm.cxx.determine_class_data_visibility (decl);
1832 /* Constrain the visibility of a class TYPE based on the visibility of its
1833 field types. Warn if any fields require lesser visibility. */
1836 constrain_class_visibility (tree type)
1838 tree decl = TYPE_MAIN_DECL (type);
1839 tree binfo = TYPE_BINFO (type);
1843 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1844 if (TREE_CODE (t) == FIELD_DECL)
1845 if (constrain_visibility (decl, type_visibility (TREE_TYPE (t)),
1846 false, "field type"))
1847 warning (OPT_Wattributes, "\
1848 %qT declared with greater visibility than the type of its field %qD",
1851 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1852 if (constrain_visibility (decl, type_visibility (TREE_TYPE (t)),
1853 false, "base type"))
1854 warning (OPT_Wattributes, "\
1855 %qT declared with greater visibility than its base %qT",
1856 type, TREE_TYPE (t));
1859 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1860 for DECL has not already been determined, do so now by setting
1861 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1862 function is called entities with vague linkage whose definitions
1863 are available must have TREE_PUBLIC set.
1865 If this function decides to place DECL in COMDAT, it will set
1866 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1867 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1868 callers defer that decision until it is clear that DECL is actually
1872 import_export_decl (tree decl)
1877 tree class_type = NULL_TREE;
1879 if (DECL_INTERFACE_KNOWN (decl))
1882 /* We cannot determine what linkage to give to an entity with vague
1883 linkage until the end of the file. For example, a virtual table
1884 for a class will be defined if and only if the key method is
1885 defined in this translation unit. As a further example, consider
1886 that when compiling a translation unit that uses PCH file with
1887 "-frepo" it would be incorrect to make decisions about what
1888 entities to emit when building the PCH; those decisions must be
1889 delayed until the repository information has been processed. */
1890 gcc_assert (at_eof);
1891 /* Object file linkage for explicit instantiations is handled in
1892 mark_decl_instantiated. For static variables in functions with
1893 vague linkage, maybe_commonize_var is used.
1895 Therefore, the only declarations that should be provided to this
1896 function are those with external linkage that are:
1898 * implicit instantiations of function templates
1902 * implicit instantiations of static data members of class
1909 Furthermore, all entities that reach this point must have a
1910 definition available in this translation unit.
1912 The following assertions check these conditions. */
1913 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1914 || TREE_CODE (decl) == VAR_DECL);
1915 /* Any code that creates entities with TREE_PUBLIC cleared should
1916 also set DECL_INTERFACE_KNOWN. */
1917 gcc_assert (TREE_PUBLIC (decl));
1918 if (TREE_CODE (decl) == FUNCTION_DECL)
1919 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1920 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1921 || DECL_DECLARED_INLINE_P (decl));
1923 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1924 || DECL_VTABLE_OR_VTT_P (decl)
1925 || DECL_TINFO_P (decl));
1926 /* Check that a definition of DECL is available in this translation
1928 gcc_assert (!DECL_REALLY_EXTERN (decl));
1930 /* Assume that DECL will not have COMDAT linkage. */
1932 /* Assume that DECL will not be imported into this translation
1936 /* See if the repository tells us whether or not to emit DECL in
1937 this translation unit. */
1938 emit_p = repo_emit_p (decl);
1941 else if (emit_p == 1)
1943 /* The repository indicates that this entity should be defined
1944 here. Make sure the back end honors that request. */
1945 if (TREE_CODE (decl) == VAR_DECL)
1947 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1948 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1951 FOR_EACH_CLONE (clone, decl)
1952 mark_needed (clone);
1956 /* Output the definition as an ordinary strong definition. */
1957 DECL_EXTERNAL (decl) = 0;
1958 DECL_INTERFACE_KNOWN (decl) = 1;
1963 /* We have already decided what to do with this DECL; there is no
1964 need to check anything further. */
1966 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1968 class_type = DECL_CONTEXT (decl);
1969 import_export_class (class_type);
1970 if (TYPE_FOR_JAVA (class_type))
1972 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
1973 && CLASSTYPE_INTERFACE_ONLY (class_type))
1975 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
1976 && !CLASSTYPE_USE_TEMPLATE (class_type)
1977 && CLASSTYPE_KEY_METHOD (class_type)
1978 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
1979 /* The ABI requires that all virtual tables be emitted with
1980 COMDAT linkage. However, on systems where COMDAT symbols
1981 don't show up in the table of contents for a static
1982 archive, or on systems without weak symbols (where we
1983 approximate COMDAT linkage by using internal linkage), the
1984 linker will report errors about undefined symbols because
1985 it will not see the virtual table definition. Therefore,
1986 in the case that we know that the virtual table will be
1987 emitted in only one translation unit, we make the virtual
1988 table an ordinary definition with external linkage. */
1989 DECL_EXTERNAL (decl) = 0;
1990 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
1992 /* CLASS_TYPE is being exported from this translation unit,
1993 so DECL should be defined here. */
1994 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
1995 /* If a class is declared in a header with the "extern
1996 template" extension, then it will not be instantiated,
1997 even in translation units that would normally require
1998 it. Often such classes are explicitly instantiated in
1999 one translation unit. Therefore, the explicit
2000 instantiation must be made visible to other translation
2002 DECL_EXTERNAL (decl) = 0;
2005 /* The generic C++ ABI says that class data is always
2006 COMDAT, even if there is a key function. Some
2007 variants (e.g., the ARM EABI) says that class data
2008 only has COMDAT linkage if the class data might be
2009 emitted in more than one translation unit. When the
2010 key method can be inline and is inline, we still have
2011 to arrange for comdat even though
2012 class_data_always_comdat is false. */
2013 if (!CLASSTYPE_KEY_METHOD (class_type)
2014 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2015 || targetm.cxx.class_data_always_comdat ())
2017 /* The ABI requires COMDAT linkage. Normally, we
2018 only emit COMDAT things when they are needed;
2019 make sure that we realize that this entity is
2026 else if (!flag_implicit_templates
2027 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2032 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2034 tree type = TREE_TYPE (DECL_NAME (decl));
2035 if (CLASS_TYPE_P (type))
2038 import_export_class (type);
2039 if (CLASSTYPE_INTERFACE_KNOWN (type)
2040 && TYPE_POLYMORPHIC_P (type)
2041 && CLASSTYPE_INTERFACE_ONLY (type)
2042 /* If -fno-rtti was specified, then we cannot be sure
2043 that RTTI information will be emitted with the
2044 virtual table of the class, so we must emit it
2045 wherever it is used. */
2050 if (CLASSTYPE_INTERFACE_KNOWN (type)
2051 && !CLASSTYPE_INTERFACE_ONLY (type))
2053 comdat_p = (targetm.cxx.class_data_always_comdat ()
2054 || (CLASSTYPE_KEY_METHOD (type)
2055 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2060 DECL_EXTERNAL (decl) = 0;
2070 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2071 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2073 /* DECL is an implicit instantiation of a function or static
2075 if (flag_implicit_templates
2076 || (flag_implicit_inline_templates
2077 && TREE_CODE (decl) == FUNCTION_DECL
2078 && DECL_DECLARED_INLINE_P (decl)))
2081 /* If we are not implicitly generating templates, then mark
2082 this entity as undefined in this translation unit. */
2085 else if (DECL_FUNCTION_MEMBER_P (decl))
2087 if (!DECL_DECLARED_INLINE_P (decl))
2089 tree ctype = DECL_CONTEXT (decl);
2090 import_export_class (ctype);
2091 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2093 DECL_NOT_REALLY_EXTERN (decl)
2094 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2095 || (DECL_DECLARED_INLINE_P (decl)
2096 && ! flag_implement_inlines
2097 && !DECL_VINDEX (decl)));
2099 if (!DECL_NOT_REALLY_EXTERN (decl))
2100 DECL_EXTERNAL (decl) = 1;
2102 /* Always make artificials weak. */
2103 if (DECL_ARTIFICIAL (decl) && flag_weak)
2106 maybe_make_one_only (decl);
2117 /* If we are importing DECL into this translation unit, mark is
2118 an undefined here. */
2119 DECL_EXTERNAL (decl) = 1;
2120 DECL_NOT_REALLY_EXTERN (decl) = 0;
2124 /* If we decided to put DECL in COMDAT, mark it accordingly at
2126 comdat_linkage (decl);
2129 DECL_INTERFACE_KNOWN (decl) = 1;
2132 /* Return an expression that performs the destruction of DECL, which
2133 must be a VAR_DECL whose type has a non-trivial destructor, or is
2134 an array whose (innermost) elements have a non-trivial destructor. */
2137 build_cleanup (tree decl)
2140 tree type = TREE_TYPE (decl);
2142 /* This function should only be called for declarations that really
2143 require cleanups. */
2144 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2146 /* Treat all objects with destructors as used; the destructor may do
2147 something substantive. */
2150 if (TREE_CODE (type) == ARRAY_TYPE)
2154 cxx_mark_addressable (decl);
2155 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
2157 temp = build_delete (TREE_TYPE (temp), temp,
2158 sfk_complete_destructor,
2159 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2163 /* Returns the initialization guard variable for the variable DECL,
2164 which has static storage duration. */
2167 get_guard (tree decl)
2172 sname = mangle_guard_variable (decl);
2173 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2178 /* We use a type that is big enough to contain a mutex as well
2179 as an integer counter. */
2180 guard_type = targetm.cxx.guard_type ();
2181 guard = build_decl (VAR_DECL, sname, guard_type);
2183 /* The guard should have the same linkage as what it guards. */
2184 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2185 TREE_STATIC (guard) = TREE_STATIC (decl);
2186 DECL_COMMON (guard) = DECL_COMMON (decl);
2187 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2188 if (TREE_PUBLIC (decl))
2189 DECL_WEAK (guard) = DECL_WEAK (decl);
2191 DECL_ARTIFICIAL (guard) = 1;
2192 DECL_IGNORED_P (guard) = 1;
2193 TREE_USED (guard) = 1;
2194 pushdecl_top_level_and_finish (guard, NULL_TREE);
2199 /* Return those bits of the GUARD variable that should be set when the
2200 guarded entity is actually initialized. */
2203 get_guard_bits (tree guard)
2205 if (!targetm.cxx.guard_mask_bit ())
2207 /* We only set the first byte of the guard, in order to leave room
2208 for a mutex in the high-order bits. */
2209 guard = build1 (ADDR_EXPR,
2210 build_pointer_type (TREE_TYPE (guard)),
2212 guard = build1 (NOP_EXPR,
2213 build_pointer_type (char_type_node),
2215 guard = build1 (INDIRECT_REF, char_type_node, guard);
2221 /* Return an expression which determines whether or not the GUARD
2222 variable has already been initialized. */
2225 get_guard_cond (tree guard)
2229 /* Check to see if the GUARD is zero. */
2230 guard = get_guard_bits (guard);
2232 /* Mask off all but the low bit. */
2233 if (targetm.cxx.guard_mask_bit ())
2235 guard_value = integer_one_node;
2236 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2237 guard_value = convert (TREE_TYPE (guard), guard_value);
2238 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2241 guard_value = integer_zero_node;
2242 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2243 guard_value = convert (TREE_TYPE (guard), guard_value);
2244 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2247 /* Return an expression which sets the GUARD variable, indicating that
2248 the variable being guarded has been initialized. */
2251 set_guard (tree guard)
2255 /* Set the GUARD to one. */
2256 guard = get_guard_bits (guard);
2257 guard_init = integer_one_node;
2258 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2259 guard_init = convert (TREE_TYPE (guard), guard_init);
2260 return build_modify_expr (guard, NOP_EXPR, guard_init);
2263 /* Start the process of running a particular set of global constructors
2264 or destructors. Subroutine of do_[cd]tors. */
2267 start_objects (int method_type, int initp)
2273 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2275 if (initp != DEFAULT_INIT_PRIORITY)
2285 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2288 sprintf (type, "%c", method_type);
2290 fndecl = build_lang_decl (FUNCTION_DECL,
2291 get_file_function_name_long (type),
2292 build_function_type (void_type_node,
2294 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2296 /* It can be a static function as long as collect2 does not have
2297 to scan the object file to find its ctor/dtor routine. */
2298 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2300 /* Mark this declaration as used to avoid spurious warnings. */
2301 TREE_USED (current_function_decl) = 1;
2303 /* Mark this function as a global constructor or destructor. */
2304 if (method_type == 'I')
2305 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2307 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2308 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2310 body = begin_compound_stmt (BCS_FN_BODY);
2312 /* We cannot allow these functions to be elided, even if they do not
2313 have external linkage. And, there's no point in deferring
2314 compilation of these functions; they're all going to have to be
2316 DECL_INLINE (current_function_decl) = 0;
2317 DECL_UNINLINABLE (current_function_decl) = 1;
2322 /* Finish the process of running a particular set of global constructors
2323 or destructors. Subroutine of do_[cd]tors. */
2326 finish_objects (int method_type, int initp, tree body)
2331 finish_compound_stmt (body);
2332 fn = finish_function (0);
2333 expand_or_defer_fn (fn);
2335 /* When only doing semantic analysis, and no RTL generation, we
2336 can't call functions that directly emit assembly code; there is
2337 no assembly file in which to put the code. */
2338 if (flag_syntax_only)
2341 if (targetm.have_ctors_dtors)
2343 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2344 cgraph_mark_needed_node (cgraph_node (fn));
2345 if (method_type == 'I')
2346 (* targetm.asm_out.constructor) (fnsym, initp);
2348 (* targetm.asm_out.destructor) (fnsym, initp);
2352 /* The names of the parameters to the function created to handle
2353 initializations and destructions for objects with static storage
2355 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2356 #define PRIORITY_IDENTIFIER "__priority"
2358 /* The name of the function we create to handle initializations and
2359 destructions for objects with static storage duration. */
2360 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2362 /* The declaration for the __INITIALIZE_P argument. */
2363 static GTY(()) tree initialize_p_decl;
2365 /* The declaration for the __PRIORITY argument. */
2366 static GTY(()) tree priority_decl;
2368 /* The declaration for the static storage duration function. */
2369 static GTY(()) tree ssdf_decl;
2371 /* All the static storage duration functions created in this
2372 translation unit. */
2373 static GTY(()) VEC(tree,gc) *ssdf_decls;
2375 /* A map from priority levels to information about that priority
2376 level. There may be many such levels, so efficient lookup is
2378 static splay_tree priority_info_map;
2380 /* Begins the generation of the function that will handle all
2381 initialization and destruction of objects with static storage
2382 duration. The function generated takes two parameters of type
2383 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2384 nonzero, it performs initializations. Otherwise, it performs
2385 destructions. It only performs those initializations or
2386 destructions with the indicated __PRIORITY. The generated function
2389 It is assumed that this function will only be called once per
2390 translation unit. */
2393 start_static_storage_duration_function (unsigned count)
2398 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2400 /* Create the identifier for this function. It will be of the form
2401 SSDF_IDENTIFIER_<number>. */
2402 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2404 /* Create the parameters. */
2405 parm_types = void_list_node;
2406 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2407 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2408 type = build_function_type (void_type_node, parm_types);
2410 /* Create the FUNCTION_DECL itself. */
2411 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2412 get_identifier (id),
2414 TREE_PUBLIC (ssdf_decl) = 0;
2415 DECL_ARTIFICIAL (ssdf_decl) = 1;
2417 /* Put this function in the list of functions to be called from the
2418 static constructors and destructors. */
2421 ssdf_decls = VEC_alloc (tree, gc, 32);
2423 /* Take this opportunity to initialize the map from priority
2424 numbers to information about that priority level. */
2425 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2426 /*delete_key_fn=*/0,
2427 /*delete_value_fn=*/
2428 (splay_tree_delete_value_fn) &free);
2430 /* We always need to generate functions for the
2431 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2432 priorities later, we'll be sure to find the
2433 DEFAULT_INIT_PRIORITY. */
2434 get_priority_info (DEFAULT_INIT_PRIORITY);
2437 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2439 /* Create the argument list. */
2440 initialize_p_decl = cp_build_parm_decl
2441 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2442 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2443 TREE_USED (initialize_p_decl) = 1;
2444 priority_decl = cp_build_parm_decl
2445 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2446 DECL_CONTEXT (priority_decl) = ssdf_decl;
2447 TREE_USED (priority_decl) = 1;
2449 TREE_CHAIN (initialize_p_decl) = priority_decl;
2450 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2452 /* Put the function in the global scope. */
2453 pushdecl (ssdf_decl);
2455 /* Start the function itself. This is equivalent to declaring the
2458 static void __ssdf (int __initialize_p, init __priority_p);
2460 It is static because we only need to call this function from the
2461 various constructor and destructor functions for this module. */
2462 start_preparsed_function (ssdf_decl,
2463 /*attrs=*/NULL_TREE,
2466 /* Set up the scope of the outermost block in the function. */
2467 body = begin_compound_stmt (BCS_FN_BODY);
2469 /* This function must not be deferred because we are depending on
2470 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2471 DECL_INLINE (ssdf_decl) = 0;
2472 DECL_UNINLINABLE (ssdf_decl) = 1;
2477 /* Finish the generation of the function which performs initialization
2478 and destruction of objects with static storage duration. After
2479 this point, no more such objects can be created. */
2482 finish_static_storage_duration_function (tree body)
2484 /* Close out the function. */
2485 finish_compound_stmt (body);
2486 expand_or_defer_fn (finish_function (0));
2489 /* Return the information about the indicated PRIORITY level. If no
2490 code to handle this level has yet been generated, generate the
2491 appropriate prologue. */
2493 static priority_info
2494 get_priority_info (int priority)
2499 n = splay_tree_lookup (priority_info_map,
2500 (splay_tree_key) priority);
2503 /* Create a new priority information structure, and insert it
2505 pi = XNEW (struct priority_info_s);
2506 pi->initializations_p = 0;
2507 pi->destructions_p = 0;
2508 splay_tree_insert (priority_info_map,
2509 (splay_tree_key) priority,
2510 (splay_tree_value) pi);
2513 pi = (priority_info) n->value;
2518 /* The effective initialization priority of a DECL. */
2520 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2521 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2522 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2524 /* Whether a DECL needs a guard to protect it against multiple
2527 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2528 || DECL_ONE_ONLY (decl) \
2529 || DECL_WEAK (decl)))
2531 /* Set up to handle the initialization or destruction of DECL. If
2532 INITP is nonzero, we are initializing the variable. Otherwise, we
2533 are destroying it. */
2536 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2538 tree guard_if_stmt = NULL_TREE;
2541 /* If we are supposed to destruct and there's a trivial destructor,
2542 nothing has to be done. */
2544 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2547 /* Trick the compiler into thinking we are at the file and line
2548 where DECL was declared so that error-messages make sense, and so
2549 that the debugger will show somewhat sensible file and line
2551 input_location = DECL_SOURCE_LOCATION (decl);
2557 Access control for implicit calls to the constructors,
2558 the conversion functions, or the destructor called to
2559 create and destroy a static data member is performed as
2560 if these calls appeared in the scope of the member's
2563 we pretend we are in a static member function of the class of
2564 which the DECL is a member. */
2565 if (member_p (decl))
2567 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2568 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2571 /* Assume we don't need a guard. */
2573 /* We need a guard if this is an object with external linkage that
2574 might be initialized in more than one place. (For example, a
2575 static data member of a template, when the data member requires
2577 if (NEEDS_GUARD_P (decl))
2581 guard = get_guard (decl);
2583 /* When using __cxa_atexit, we just check the GUARD as we would
2584 for a local static. */
2585 if (flag_use_cxa_atexit)
2587 /* When using __cxa_atexit, we never try to destroy
2588 anything from a static destructor. */
2590 guard_cond = get_guard_cond (guard);
2592 /* If we don't have __cxa_atexit, then we will be running
2593 destructors from .fini sections, or their equivalents. So,
2594 we need to know how many times we've tried to initialize this
2595 object. We do initializations only if the GUARD is zero,
2596 i.e., if we are the first to initialize the variable. We do
2597 destructions only if the GUARD is one, i.e., if we are the
2598 last to destroy the variable. */
2601 = cp_build_binary_op (EQ_EXPR,
2602 build_unary_op (PREINCREMENT_EXPR,
2608 = cp_build_binary_op (EQ_EXPR,
2609 build_unary_op (PREDECREMENT_EXPR,
2614 guard_if_stmt = begin_if_stmt ();
2615 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2619 /* If we're using __cxa_atexit, we have not already set the GUARD,
2620 so we must do so now. */
2621 if (guard && initp && flag_use_cxa_atexit)
2622 finish_expr_stmt (set_guard (guard));
2624 /* Perform the initialization or destruction. */
2628 finish_expr_stmt (init);
2630 /* If we're using __cxa_atexit, register a function that calls the
2631 destructor for the object. */
2632 if (flag_use_cxa_atexit)
2633 finish_expr_stmt (register_dtor_fn (decl));
2636 finish_expr_stmt (build_cleanup (decl));
2638 /* Finish the guard if-stmt, if necessary. */
2641 finish_then_clause (guard_if_stmt);
2642 finish_if_stmt (guard_if_stmt);
2645 /* Now that we're done with DECL we don't need to pretend to be a
2646 member of its class any longer. */
2647 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2648 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2651 /* Generate code to do the initialization or destruction of the decls in VARS,
2652 a TREE_LIST of VAR_DECL with static storage duration.
2653 Whether initialization or destruction is performed is specified by INITP. */
2656 do_static_initialization_or_destruction (tree vars, bool initp)
2658 tree node, init_if_stmt, cond;
2660 /* Build the outer if-stmt to check for initialization or destruction. */
2661 init_if_stmt = begin_if_stmt ();
2662 cond = initp ? integer_one_node : integer_zero_node;
2663 cond = cp_build_binary_op (EQ_EXPR,
2666 finish_if_stmt_cond (cond, init_if_stmt);
2670 tree decl = TREE_VALUE (node);
2671 tree priority_if_stmt;
2675 /* If we don't need a destructor, there's nothing to do. Avoid
2676 creating a possibly empty if-stmt. */
2677 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2679 node = TREE_CHAIN (node);
2683 /* Remember that we had an initialization or finalization at this
2685 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2686 pi = get_priority_info (priority);
2688 pi->initializations_p = 1;
2690 pi->destructions_p = 1;
2692 /* Conditionalize this initialization on being in the right priority
2693 and being initializing/finalizing appropriately. */
2694 priority_if_stmt = begin_if_stmt ();
2695 cond = cp_build_binary_op (EQ_EXPR,
2697 build_int_cst (NULL_TREE, priority));
2698 finish_if_stmt_cond (cond, priority_if_stmt);
2700 /* Process initializers with same priority. */
2702 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2703 node = TREE_CHAIN (node))
2704 /* Do one initialization or destruction. */
2705 one_static_initialization_or_destruction (TREE_VALUE (node),
2706 TREE_PURPOSE (node), initp);
2708 /* Finish up the priority if-stmt body. */
2709 finish_then_clause (priority_if_stmt);
2710 finish_if_stmt (priority_if_stmt);
2714 /* Finish up the init/destruct if-stmt body. */
2715 finish_then_clause (init_if_stmt);
2716 finish_if_stmt (init_if_stmt);
2719 /* VARS is a list of variables with static storage duration which may
2720 need initialization and/or finalization. Remove those variables
2721 that don't really need to be initialized or finalized, and return
2722 the resulting list. The order in which the variables appear in
2723 VARS is in reverse order of the order in which they should actually
2724 be initialized. The list we return is in the unreversed order;
2725 i.e., the first variable should be initialized first. */
2728 prune_vars_needing_no_initialization (tree *vars)
2731 tree result = NULL_TREE;
2736 tree decl = TREE_VALUE (t);
2737 tree init = TREE_PURPOSE (t);
2739 /* Deal gracefully with error. */
2740 if (decl == error_mark_node)
2742 var = &TREE_CHAIN (t);
2746 /* The only things that can be initialized are variables. */
2747 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2749 /* If this object is not defined, we don't need to do anything
2751 if (DECL_EXTERNAL (decl))
2753 var = &TREE_CHAIN (t);
2757 /* Also, if the initializer already contains errors, we can bail
2759 if (init && TREE_CODE (init) == TREE_LIST
2760 && value_member (error_mark_node, init))
2762 var = &TREE_CHAIN (t);
2766 /* This variable is going to need initialization and/or
2767 finalization, so we add it to the list. */
2768 *var = TREE_CHAIN (t);
2769 TREE_CHAIN (t) = result;
2776 /* Make sure we have told the back end about all the variables in
2780 write_out_vars (tree vars)
2784 for (v = vars; v; v = TREE_CHAIN (v))
2786 tree var = TREE_VALUE (v);
2787 if (!var_finalized_p (var))
2789 import_export_decl (var);
2790 rest_of_decl_compilation (var, 1, 1);
2795 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2796 (otherwise) that will initialize all gobal objects with static
2797 storage duration having the indicated PRIORITY. */
2800 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2809 input_location = *locus;
2810 #ifdef USE_MAPPED_LOCATION
2816 /* We use `I' to indicate initialization and `D' to indicate
2818 function_key = constructor_p ? 'I' : 'D';
2820 /* We emit the function lazily, to avoid generating empty
2821 global constructors and destructors. */
2824 /* For Objective-C++, we may need to initialize metadata found in this module.
2825 This must be done _before_ any other static initializations. */
2826 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2827 && constructor_p && objc_static_init_needed_p ())
2829 body = start_objects (function_key, priority);
2830 static_ctors = objc_generate_static_init_call (static_ctors);
2833 /* Call the static storage duration function with appropriate
2835 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2837 /* Calls to pure or const functions will expand to nothing. */
2838 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2841 body = start_objects (function_key, priority);
2843 arguments = tree_cons (NULL_TREE,
2844 build_int_cst (NULL_TREE, priority),
2846 arguments = tree_cons (NULL_TREE,
2847 build_int_cst (NULL_TREE, constructor_p),
2849 finish_expr_stmt (build_function_call (fndecl, arguments));
2853 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2854 calls to any functions marked with attributes indicating that
2855 they should be called at initialization- or destruction-time. */
2856 if (priority == DEFAULT_INIT_PRIORITY)
2860 for (fns = constructor_p ? static_ctors : static_dtors;
2862 fns = TREE_CHAIN (fns))
2864 fndecl = TREE_VALUE (fns);
2866 /* Calls to pure/const functions will expand to nothing. */
2867 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2870 body = start_objects (function_key, priority);
2871 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2876 /* Close out the function. */
2878 finish_objects (function_key, priority, body);
2881 /* Generate constructor and destructor functions for the priority
2885 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2887 location_t *locus = (location_t *) data;
2888 int priority = (int) n->key;
2889 priority_info pi = (priority_info) n->value;
2891 /* Generate the functions themselves, but only if they are really
2893 if (pi->initializations_p
2894 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2895 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2896 if (pi->destructions_p
2897 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2898 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2900 /* Keep iterating. */
2904 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2905 decls referenced from frontend specific constructs; it will be called
2906 only for language-specific tree nodes.
2908 Here we must deal with member pointers. */
2911 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2912 tree from ATTRIBUTE_UNUSED)
2916 switch (TREE_CODE (t))
2919 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2920 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2923 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2924 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2927 if (DECL_VTABLE_OR_VTT_P (t))
2929 /* The ABI requires that all virtual tables be emitted
2930 whenever one of them is. */
2932 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2934 vtbl = TREE_CHAIN (vtbl))
2935 mark_decl_referenced (vtbl);
2937 else if (DECL_CONTEXT (t)
2938 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2939 /* If we need a static variable in a function, then we
2940 need the containing function. */
2941 mark_decl_referenced (DECL_CONTEXT (t));
2950 /* Java requires that we be able to reference a local address for a
2951 method, and not be confused by PLT entries. If hidden aliases are
2952 supported, emit one for each java function that we've emitted. */
2955 build_java_method_aliases (void)
2957 struct cgraph_node *node;
2959 #ifndef HAVE_GAS_HIDDEN
2963 for (node = cgraph_nodes; node ; node = node->next)
2965 tree fndecl = node->decl;
2967 if (TREE_ASM_WRITTEN (fndecl)
2968 && DECL_CONTEXT (fndecl)
2969 && TYPE_P (DECL_CONTEXT (fndecl))
2970 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2971 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
2973 /* Mangle the name in a predictable way; we need to reference
2974 this from a java compiled object file. */
2975 tree oid, nid, alias;
2979 oid = DECL_ASSEMBLER_NAME (fndecl);
2980 oname = IDENTIFIER_POINTER (oid);
2981 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
2982 nname = ACONCAT (("_ZGA", oname+2, NULL));
2983 nid = get_identifier (nname);
2985 alias = make_alias_for (fndecl, nid);
2986 TREE_PUBLIC (alias) = 1;
2987 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
2989 assemble_alias (alias, oid);
2994 /* This routine is called from the last rule in yyparse ().
2995 Its job is to create all the code needed to initialize and
2996 destroy the global aggregates. We do the destruction
2997 first, since that way we only need to reverse the decls once. */
3000 cp_finish_file (void)
3006 unsigned ssdf_count = 0;
3010 locus = input_location;
3013 /* Bad parse errors. Just forget about it. */
3014 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3018 c_common_write_pch ();
3020 #ifdef USE_MAPPED_LOCATION
3023 /* Otherwise, GDB can get confused, because in only knows
3024 about source for LINENO-1 lines. */
3028 /* We now have to write out all the stuff we put off writing out.
3031 o Template specializations that we have not yet instantiated,
3032 but which are needed.
3033 o Initialization and destruction for non-local objects with
3034 static storage duration. (Local objects with static storage
3035 duration are initialized when their scope is first entered,
3036 and are cleaned up via atexit.)
3037 o Virtual function tables.
3039 All of these may cause others to be needed. For example,
3040 instantiating one function may cause another to be needed, and
3041 generating the initializer for an object may cause templates to be
3042 instantiated, etc., etc. */
3044 timevar_push (TV_VARCONST);
3046 emit_support_tinfos ();
3055 /* If there are templates that we've put off instantiating, do
3057 instantiate_pending_templates (retries);
3060 /* Write out virtual tables as required. Note that writing out
3061 the virtual table for a template class may cause the
3062 instantiation of members of that class. If we write out
3063 vtables then we remove the class from our list so we don't
3064 have to look at it again. */
3066 while (keyed_classes != NULL_TREE
3067 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3070 keyed_classes = TREE_CHAIN (keyed_classes);
3076 tree next = TREE_CHAIN (t);
3080 if (maybe_emit_vtables (TREE_VALUE (next)))
3083 TREE_CHAIN (t) = TREE_CHAIN (next);
3088 next = TREE_CHAIN (t);
3092 /* Write out needed type info variables. We have to be careful
3093 looping through unemitted decls, because emit_tinfo_decl may
3094 cause other variables to be needed. New elements will be
3095 appended, and we remove from the vector those that actually
3097 for (i = VEC_length (tree, unemitted_tinfo_decls);
3098 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3099 if (emit_tinfo_decl (t))
3102 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3105 /* The list of objects with static storage duration is built up
3106 in reverse order. We clear STATIC_AGGREGATES so that any new
3107 aggregates added during the initialization of these will be
3108 initialized in the correct order when we next come around the
3110 vars = prune_vars_needing_no_initialization (&static_aggregates);
3114 /* We need to start a new initialization function each time
3115 through the loop. That's because we need to know which
3116 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3117 isn't computed until a function is finished, and written
3118 out. That's a deficiency in the back-end. When this is
3119 fixed, these initialization functions could all become
3120 inline, with resulting performance improvements. */
3123 /* Set the line and file, so that it is obviously not from
3125 input_location = locus;
3126 ssdf_body = start_static_storage_duration_function (ssdf_count);
3128 /* Make sure the back end knows about all the variables. */
3129 write_out_vars (vars);
3131 /* First generate code to do all the initializations. */
3133 do_static_initialization_or_destruction (vars, /*initp=*/true);
3135 /* Then, generate code to do all the destructions. Do these
3136 in reverse order so that the most recently constructed
3137 variable is the first destroyed. If we're using
3138 __cxa_atexit, then we don't need to do this; functions
3139 were registered at initialization time to destroy the
3141 if (!flag_use_cxa_atexit && vars)
3143 vars = nreverse (vars);
3144 do_static_initialization_or_destruction (vars, /*initp=*/false);
3149 /* Finish up the static storage duration function for this
3151 input_location = locus;
3152 finish_static_storage_duration_function (ssdf_body);
3154 /* All those initializations and finalizations might cause
3155 us to need more inline functions, more template
3156 instantiations, etc. */
3159 #ifdef USE_MAPPED_LOCATION
3166 /* Go through the set of inline functions whose bodies have not
3167 been emitted yet. If out-of-line copies of these functions
3168 are required, emit them. */
3169 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3171 /* Does it need synthesizing? */
3172 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3173 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3175 /* Even though we're already at the top-level, we push
3176 there again. That way, when we pop back a few lines
3177 hence, all of our state is restored. Otherwise,
3178 finish_function doesn't clean things up, and we end
3179 up with CURRENT_FUNCTION_DECL set. */
3180 push_to_top_level ();
3181 /* The decl's location will mark where it was first
3182 needed. Save that so synthesize method can indicate
3183 where it was needed from, in case of error */
3184 input_location = DECL_SOURCE_LOCATION (decl);
3185 synthesize_method (decl);
3186 pop_from_top_level ();
3190 if (!DECL_SAVED_TREE (decl))
3193 /* We lie to the back-end, pretending that some functions
3194 are not defined when they really are. This keeps these
3195 functions from being put out unnecessarily. But, we must
3196 stop lying when the functions are referenced, or if they
3197 are not comdat since they need to be put out now. If
3198 DECL_INTERFACE_KNOWN, then we have already set
3199 DECL_EXTERNAL appropriately, so there's no need to check
3200 again, and we do not want to clear DECL_EXTERNAL if a
3201 previous call to import_export_decl set it.
3203 This is done in a separate for cycle, because if some
3204 deferred function is contained in another deferred
3205 function later in deferred_fns varray,
3206 rest_of_compilation would skip this function and we
3207 really cannot expand the same function twice. */
3208 import_export_decl (decl);
3209 if (DECL_NOT_REALLY_EXTERN (decl)
3210 && DECL_INITIAL (decl)
3211 && decl_needed_p (decl))
3212 DECL_EXTERNAL (decl) = 0;
3214 /* If we're going to need to write this function out, and
3215 there's already a body for it, create RTL for it now.
3216 (There might be no body if this is a method we haven't
3217 gotten around to synthesizing yet.) */
3218 if (!DECL_EXTERNAL (decl)
3219 && decl_needed_p (decl)
3220 && !TREE_ASM_WRITTEN (decl)
3221 && !cgraph_node (decl)->local.finalized)
3223 /* We will output the function; no longer consider it in this
3225 DECL_DEFER_OUTPUT (decl) = 0;
3226 /* Generate RTL for this function now that we know we
3228 expand_or_defer_fn (decl);
3229 /* If we're compiling -fsyntax-only pretend that this
3230 function has been written out so that we don't try to
3232 if (flag_syntax_only)
3233 TREE_ASM_WRITTEN (decl) = 1;
3238 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3241 /* Static data members are just like namespace-scope globals. */
3242 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3244 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3246 import_export_decl (decl);
3247 /* If this static data member is needed, provide it to the
3249 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3250 DECL_EXTERNAL (decl) = 0;
3252 if (VEC_length (tree, pending_statics) != 0
3253 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3254 VEC_length (tree, pending_statics)))
3261 /* All used inline functions must have a definition at this point. */
3262 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3264 if (/* Check online inline functions that were actually used. */
3265 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3266 /* If the definition actually was available here, then the
3267 fact that the function was not defined merely represents
3268 that for some reason (use of a template repository,
3269 #pragma interface, etc.) we decided not to emit the
3271 && !DECL_INITIAL (decl)
3272 /* An explicit instantiation can be used to specify
3273 that the body is in another unit. It will have
3274 already verified there was a definition. */
3275 && !DECL_EXPLICIT_INSTANTIATION (decl))
3277 warning (0, "inline function %q+D used but never defined", decl);
3278 /* Avoid a duplicate warning from check_global_declaration_1. */
3279 TREE_NO_WARNING (decl) = 1;
3283 /* We give C linkage to static constructors and destructors. */
3284 push_lang_context (lang_name_c);
3286 /* Generate initialization and destruction functions for all
3287 priorities for which they are required. */
3288 if (priority_info_map)
3289 splay_tree_foreach (priority_info_map,
3290 generate_ctor_and_dtor_functions_for_priority,
3294 /* If we have a ctor or this is obj-c++ and we need a static init,
3295 call generate_ctor_or_dtor_function. */
3296 if (static_ctors || (c_dialect_objc () && objc_static_init_needed_p ()))
3297 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3298 DEFAULT_INIT_PRIORITY, &locus);
3300 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3301 DEFAULT_INIT_PRIORITY, &locus);
3304 /* We're done with the splay-tree now. */
3305 if (priority_info_map)
3306 splay_tree_delete (priority_info_map);
3308 /* Generate any missing aliases. */
3309 maybe_apply_pending_pragma_weaks ();
3311 /* We're done with static constructors, so we can go back to "C++"
3313 pop_lang_context ();
3315 cgraph_finalize_compilation_unit ();
3318 /* Now, issue warnings about static, but not defined, functions,
3319 etc., and emit debugging information. */
3320 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3321 if (VEC_length (tree, pending_statics) != 0)
3323 check_global_declarations (VEC_address (tree, pending_statics),
3324 VEC_length (tree, pending_statics));
3325 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3326 VEC_length (tree, pending_statics));
3329 /* Generate hidden aliases for Java. */
3330 build_java_method_aliases ();
3334 /* The entire file is now complete. If requested, dump everything
3338 FILE *stream = dump_begin (TDI_tu, &flags);
3342 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3343 dump_end (TDI_tu, stream);
3347 timevar_pop (TV_VARCONST);
3349 if (flag_detailed_statistics)
3351 dump_tree_statistics ();
3352 dump_time_statistics ();
3354 input_location = locus;
3356 #ifdef ENABLE_CHECKING
3357 validate_conversion_obstack ();
3358 #endif /* ENABLE_CHECKING */
3361 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3362 function to call in parse-tree form; it has not yet been
3363 semantically analyzed. ARGS are the arguments to the function.
3364 They have already been semantically analyzed. */
3367 build_offset_ref_call_from_tree (tree fn, tree args)
3376 object = TREE_OPERAND (fn, 0);
3378 if (processing_template_decl)
3380 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3381 || TREE_CODE (fn) == MEMBER_REF);
3382 if (type_dependent_expression_p (fn)
3383 || any_type_dependent_arguments_p (args))
3384 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3386 /* Transform the arguments and add the implicit "this"
3387 parameter. That must be done before the FN is transformed
3388 because we depend on the form of FN. */
3389 args = build_non_dependent_args (args);
3390 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3391 object = build_unary_op (ADDR_EXPR, object, 0);
3392 object = build_non_dependent_expr (object);
3393 args = tree_cons (NULL_TREE, object, args);
3394 /* Now that the arguments are done, transform FN. */
3395 fn = build_non_dependent_expr (fn);
3398 /* A qualified name corresponding to a bound pointer-to-member is
3399 represented as an OFFSET_REF:
3401 struct B { void g(); };
3403 void B::g() { (this->*p)(); } */
3404 if (TREE_CODE (fn) == OFFSET_REF)
3406 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3407 fn = TREE_OPERAND (fn, 1);
3408 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3409 args = tree_cons (NULL_TREE, object_addr, args);
3412 expr = build_function_call (fn, args);
3413 if (processing_template_decl && expr != error_mark_node)
3414 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3420 check_default_args (tree x)
3422 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3423 bool saw_def = false;
3424 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3425 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3427 if (TREE_PURPOSE (arg))
3431 error ("default argument missing for parameter %P of %q+#D", i, x);
3432 TREE_PURPOSE (arg) = error_mark_node;
3437 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3438 If DECL is a specialization or implicitly declared class member,
3439 generate the actual definition. */
3442 mark_used (tree decl)
3444 HOST_WIDE_INT saved_processing_template_decl = 0;
3446 /* If DECL is a BASELINK for a single function, then treat it just
3447 like the DECL for the function. Otherwise, if the BASELINK is
3448 for an overloaded function, we don't know which function was
3449 actually used until after overload resolution. */
3450 if (TREE_CODE (decl) == BASELINK)
3452 decl = BASELINK_FUNCTIONS (decl);
3453 if (really_overloaded_fn (decl))
3455 decl = OVL_CURRENT (decl);
3458 TREE_USED (decl) = 1;
3459 /* If we don't need a value, then we don't need to synthesize DECL. */
3460 if (skip_evaluation)
3462 /* Normally, we can wait until instantiation-time to synthesize
3463 DECL. However, if DECL is a static data member initialized with
3464 a constant, we need the value right now because a reference to
3465 such a data member is not value-dependent. */
3466 if (TREE_CODE (decl) == VAR_DECL
3467 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3468 && DECL_CLASS_SCOPE_P (decl))
3470 /* Don't try to instantiate members of dependent types. We
3471 cannot just use dependent_type_p here because this function
3472 may be called from fold_non_dependent_expr, and then we may
3473 see dependent types, even though processing_template_decl
3475 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3476 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3478 /* Pretend that we are not in a template, even if we are, so
3479 that the static data member initializer will be processed. */
3480 saved_processing_template_decl = processing_template_decl;
3481 processing_template_decl = 0;
3484 if (processing_template_decl)
3487 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3488 && !TREE_ASM_WRITTEN (decl))
3489 /* Remember it, so we can check it was defined. */
3491 if (DECL_DEFERRED_FN (decl))
3494 /* Remember the current location for a function we will end up
3495 synthesizing. Then we can inform the user where it was
3496 required in the case of error. */
3497 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3498 && !DECL_THUNK_P (decl))
3499 DECL_SOURCE_LOCATION (decl) = input_location;
3501 note_vague_linkage_fn (decl);
3504 assemble_external (decl);
3506 /* Is it a synthesized method that needs to be synthesized? */
3507 if (TREE_CODE (decl) == FUNCTION_DECL
3508 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3509 && DECL_ARTIFICIAL (decl)
3510 && !DECL_THUNK_P (decl)
3511 && ! DECL_INITIAL (decl)
3512 /* Kludge: don't synthesize for default args. Unfortunately this
3513 rules out initializers of namespace-scoped objects too, but
3514 it's sort-of ok if the implicit ctor or dtor decl keeps
3515 pointing to the class location. */
3516 && current_function_decl)
3518 synthesize_method (decl);
3519 /* If we've already synthesized the method we don't need to
3520 do the instantiation test below. */
3522 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3523 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3524 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3525 || (TREE_CODE (decl) == FUNCTION_DECL
3526 && DECL_INLINE (DECL_TEMPLATE_RESULT
3527 (template_for_substitution (decl))))
3528 /* We need to instantiate static data members so that there
3529 initializers are available in integral constant
3531 || (TREE_CODE (decl) == VAR_DECL
3532 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3533 /* If this is a function or variable that is an instance of some
3534 template, we now know that we will need to actually do the
3535 instantiation. We check that DECL is not an explicit
3536 instantiation because that is not checked in instantiate_decl.
3538 We put off instantiating functions in order to improve compile
3539 times. Maintaining a stack of active functions is expensive,
3540 and the inliner knows to instantiate any functions it might
3541 need. Therefore, we always try to defer instantiation. */
3542 instantiate_decl (decl, /*defer_ok=*/true,
3543 /*expl_inst_class_mem_p=*/false);
3545 processing_template_decl = saved_processing_template_decl;
3548 #include "gt-cp-decl2.h"