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 (type == error_mark_node)
475 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
477 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
479 type = TREE_TYPE (type);
480 if (TREE_CODE (type) == RECORD_TYPE)
483 if (! TYPE_FOR_JAVA (type))
485 if (! CLASSTYPE_TEMPLATE_INFO (type))
487 args = CLASSTYPE_TI_ARGS (type);
488 i = TREE_VEC_LENGTH (args);
491 type = TREE_VEC_ELT (args, i);
492 if (TREE_CODE (type) == POINTER_TYPE)
493 type = TREE_TYPE (type);
494 if (! TYPE_FOR_JAVA (type))
503 /* For a METHOD in a Java class CTYPE, return true if
504 the parameter and return types are valid Java types.
505 Otherwise, print appropriate error messages, and return false. */
508 check_java_method (tree method)
511 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
512 tree ret_type = TREE_TYPE (TREE_TYPE (method));
514 if (!acceptable_java_type (ret_type))
516 error ("Java method %qD has non-Java return type %qT",
521 arg_types = TREE_CHAIN (arg_types);
522 if (DECL_HAS_IN_CHARGE_PARM_P (method))
523 arg_types = TREE_CHAIN (arg_types);
524 if (DECL_HAS_VTT_PARM_P (method))
525 arg_types = TREE_CHAIN (arg_types);
527 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
529 tree type = TREE_VALUE (arg_types);
530 if (!acceptable_java_type (type))
532 if (type != error_mark_node)
533 error ("Java method %qD has non-Java parameter type %qT",
541 /* Sanity check: report error if this function FUNCTION is not
542 really a member of the class (CTYPE) it is supposed to belong to.
543 TEMPLATE_PARMS is used to specify the template parameters of a member
544 template passed as FUNCTION_DECL. If the member template is passed as a
545 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
546 from the declaration. If the function is not a function template, it
548 It returns the original declaration for the function, or NULL_TREE
549 if no declaration was found (and an error was emitted). */
552 check_classfn (tree ctype, tree function, tree template_parms)
557 if (DECL_USE_TEMPLATE (function)
558 && !(TREE_CODE (function) == TEMPLATE_DECL
559 && DECL_TEMPLATE_SPECIALIZATION (function))
560 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
561 /* Since this is a specialization of a member template,
562 we're not going to find the declaration in the class.
565 struct S { template <typename T> void f(T); };
566 template <> void S::f(int);
568 we're not going to find `S::f(int)', but there's no
569 reason we should, either. We let our callers know we didn't
570 find the method, but we don't complain. */
573 /* Basic sanity check: for a template function, the template parameters
574 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
575 if (TREE_CODE (function) == TEMPLATE_DECL)
577 gcc_assert (!template_parms
578 || comp_template_parms (template_parms,
579 DECL_TEMPLATE_PARMS (function)));
580 template_parms = DECL_TEMPLATE_PARMS (function);
583 /* OK, is this a definition of a member template? */
584 is_template = (template_parms != NULL_TREE);
586 ix = class_method_index_for_fn (complete_type (ctype), function);
589 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
590 tree fndecls, fndecl = 0;
593 const char *format = NULL;
595 pushed_scope = push_scope (ctype);
596 for (fndecls = VEC_index (tree, methods, ix);
597 fndecls; fndecls = OVL_NEXT (fndecls))
601 fndecl = OVL_CURRENT (fndecls);
602 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
603 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
605 /* We cannot simply call decls_match because this doesn't
606 work for static member functions that are pretending to
607 be methods, and because the name may have been changed by
610 /* Get rid of the this parameter on functions that become
612 if (DECL_STATIC_FUNCTION_P (fndecl)
613 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
614 p1 = TREE_CHAIN (p1);
616 /* A member template definition only matches a member template
618 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
621 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
622 TREE_TYPE (TREE_TYPE (fndecl)))
623 && compparms (p1, p2)
625 || comp_template_parms (template_parms,
626 DECL_TEMPLATE_PARMS (fndecl)))
627 && (DECL_TEMPLATE_SPECIALIZATION (function)
628 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
629 && (!DECL_TEMPLATE_SPECIALIZATION (function)
630 || (DECL_TI_TEMPLATE (function)
631 == DECL_TI_TEMPLATE (fndecl))))
635 pop_scope (pushed_scope);
637 return OVL_CURRENT (fndecls);
638 error ("prototype for %q#D does not match any in class %qT",
640 is_conv_op = DECL_CONV_FN_P (fndecl);
643 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
644 fndecls = VEC_index (tree, methods, ix);
647 fndecl = OVL_CURRENT (fndecls);
648 fndecls = OVL_NEXT (fndecls);
650 if (!fndecls && is_conv_op)
652 if (VEC_length (tree, methods) > (size_t) ++ix)
654 fndecls = VEC_index (tree, methods, ix);
655 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
667 format = N_("candidates are: %+#D");
669 format = N_("candidate is: %+#D");
670 error (format, fndecl);
673 else if (!COMPLETE_TYPE_P (ctype))
674 cxx_incomplete_type_error (function, ctype);
676 error ("no %q#D member function declared in class %qT",
679 /* If we did not find the method in the class, add it to avoid
680 spurious errors (unless the CTYPE is not yet defined, in which
681 case we'll only confuse ourselves when the function is declared
682 properly within the class. */
683 if (COMPLETE_TYPE_P (ctype))
684 add_method (ctype, function, NULL_TREE);
688 /* DECL is a function with vague linkage. Remember it so that at the
689 end of the translation unit we can decide whether or not to emit
693 note_vague_linkage_fn (tree decl)
695 if (!DECL_DEFERRED_FN (decl))
697 DECL_DEFERRED_FN (decl) = 1;
698 DECL_DEFER_OUTPUT (decl) = 1;
699 VEC_safe_push (tree, gc, deferred_fns, decl);
703 /* We have just processed the DECL, which is a static data member.
704 The other parameters are as for cp_finish_decl. */
707 finish_static_data_member_decl (tree decl,
708 tree init, bool init_const_expr_p,
712 DECL_CONTEXT (decl) = current_class_type;
714 /* We cannot call pushdecl here, because that would fill in the
715 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
716 the right thing, namely, to put this decl out straight away. */
718 if (! processing_template_decl)
719 VEC_safe_push (tree, gc, pending_statics, decl);
721 if (LOCAL_CLASS_P (current_class_type))
722 pedwarn ("local class %q#T shall not have static data member %q#D",
723 current_class_type, decl);
725 /* Static consts need not be initialized in the class definition. */
726 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
728 static int explained = 0;
730 error ("initializer invalid for static member with constructor");
733 error ("(an out of class initialization is required)");
738 /* Force the compiler to know when an uninitialized static const
739 member is being used. */
740 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
741 TREE_USED (decl) = 1;
742 DECL_INITIAL (decl) = init;
743 DECL_IN_AGGR_P (decl) = 1;
745 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
748 /* DECLARATOR and DECLSPECS correspond to a class member. The other
749 parameters are as for cp_finish_decl. Return the DECL for the
750 class member declared. */
753 grokfield (const cp_declarator *declarator,
754 cp_decl_specifier_seq *declspecs,
755 tree init, bool init_const_expr_p,
760 const char *asmspec = 0;
761 int flags = LOOKUP_ONLYCONVERTING;
763 if (!declspecs->any_specifiers_p
764 && declarator->kind == cdk_id
765 && declarator->u.id.qualifying_scope
766 && TYPE_P (declarator->u.id.qualifying_scope)
767 && IS_AGGR_TYPE (declarator->u.id.qualifying_scope)
768 && TREE_CODE (declarator->u.id.unqualified_name) == IDENTIFIER_NODE)
769 /* Access declaration */
770 return do_class_using_decl (declarator->u.id.qualifying_scope,
771 declarator->u.id.unqualified_name);
774 && TREE_CODE (init) == TREE_LIST
775 && TREE_VALUE (init) == error_mark_node
776 && TREE_CHAIN (init) == NULL_TREE)
779 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
780 if (! value || error_operand_p (value))
781 /* friend or constructor went bad. */
782 return error_mark_node;
784 if (TREE_CODE (value) == TYPE_DECL && init)
786 error ("typedef %qD is initialized (use __typeof__ instead)", value);
790 /* Pass friendly classes back. */
791 if (value == void_type_node)
794 /* Pass friend decls back. */
795 if ((TREE_CODE (value) == FUNCTION_DECL
796 || TREE_CODE (value) == TEMPLATE_DECL)
797 && DECL_CONTEXT (value) != current_class_type)
800 if (DECL_NAME (value) != NULL_TREE
801 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
802 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
803 error ("member %qD conflicts with virtual function table field name",
806 /* Stash away type declarations. */
807 if (TREE_CODE (value) == TYPE_DECL)
809 DECL_NONLOCAL (value) = 1;
810 DECL_CONTEXT (value) = current_class_type;
812 if (processing_template_decl)
813 value = push_template_decl (value);
817 /* Avoid storing attributes in template parameters:
818 tsubst is not ready to handle them. */
819 tree type = TREE_TYPE (value);
820 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
821 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
822 sorry ("applying attributes to template parameters is not implemented");
824 cplus_decl_attributes (&value, attrlist, 0);
830 if (DECL_IN_AGGR_P (value))
832 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
833 return void_type_node;
836 if (asmspec_tree && asmspec_tree != error_mark_node)
837 asmspec = TREE_STRING_POINTER (asmspec_tree);
841 if (TREE_CODE (value) == FUNCTION_DECL)
843 /* Initializers for functions are rejected early in the parser.
844 If we get here, it must be a pure specifier for a method. */
845 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
847 gcc_assert (error_operand_p (init) || integer_zerop (init));
848 DECL_PURE_VIRTUAL_P (value) = 1;
852 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
853 error ("initializer specified for static member function %qD",
857 else if (pedantic && TREE_CODE (value) != VAR_DECL)
858 /* Already complained in grokdeclarator. */
860 else if (!processing_template_decl)
862 if (TREE_CODE (init) == CONSTRUCTOR)
863 init = digest_init (TREE_TYPE (value), init);
865 init = integral_constant_value (init);
867 if (init != error_mark_node && !TREE_CONSTANT (init))
869 /* We can allow references to things that are effectively
870 static, since references are initialized with the
872 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
873 || (TREE_STATIC (init) == 0
874 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
876 error ("field initializer is not constant");
877 init = error_mark_node;
883 if (processing_template_decl
884 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
886 value = push_template_decl (value);
887 if (error_operand_p (value))
888 return error_mark_node;
892 cplus_decl_attributes (&value, attrlist, 0);
894 switch (TREE_CODE (value))
897 finish_static_data_member_decl (value, init, init_const_expr_p,
898 asmspec_tree, flags);
903 error ("%<asm%> specifiers are not permitted on non-static data members");
904 if (DECL_INITIAL (value) == error_mark_node)
905 init = error_mark_node;
906 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
908 DECL_INITIAL (value) = init;
909 DECL_IN_AGGR_P (value) = 1;
914 set_user_assembler_name (value, asmspec);
916 cp_finish_decl (value,
918 /*init_const_expr_p=*/false,
919 asmspec_tree, flags);
921 /* Pass friends back this way. */
922 if (DECL_FRIEND_P (value))
923 return void_type_node;
925 DECL_IN_AGGR_P (value) = 1;
934 /* Like `grokfield', but for bitfields.
935 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
938 grokbitfield (const cp_declarator *declarator,
939 cp_decl_specifier_seq *declspecs, tree width)
941 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
943 if (value == error_mark_node)
944 return NULL_TREE; /* friends went bad. */
946 /* Pass friendly classes back. */
947 if (TREE_CODE (value) == VOID_TYPE)
948 return void_type_node;
950 if (TREE_CODE (value) == TYPE_DECL)
952 error ("cannot declare %qD to be a bit-field type", value);
956 /* Usually, finish_struct_1 catches bitfields with invalid types.
957 But, in the case of bitfields with function type, we confuse
958 ourselves into thinking they are member functions, so we must
960 if (TREE_CODE (value) == FUNCTION_DECL)
962 error ("cannot declare bit-field %qD with function type",
967 if (DECL_IN_AGGR_P (value))
969 error ("%qD is already defined in the class %qT", value,
970 DECL_CONTEXT (value));
971 return void_type_node;
974 if (TREE_STATIC (value))
976 error ("static member %qD cannot be a bit-field", value);
979 finish_decl (value, NULL_TREE, NULL_TREE);
981 if (width != error_mark_node)
983 constant_expression_warning (width);
984 DECL_INITIAL (value) = width;
985 SET_DECL_C_BIT_FIELD (value);
988 DECL_IN_AGGR_P (value) = 1;
994 cplus_decl_attributes (tree *decl, tree attributes, int flags)
996 if (*decl == NULL_TREE || *decl == void_type_node
997 || *decl == error_mark_node)
1000 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1001 decl = &DECL_TEMPLATE_RESULT (*decl);
1003 decl_attributes (decl, attributes, flags);
1005 if (TREE_CODE (*decl) == TYPE_DECL)
1006 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1009 /* Walks through the namespace- or function-scope anonymous union
1010 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1011 Returns one of the fields for use in the mangled name. */
1014 build_anon_union_vars (tree type, tree object)
1016 tree main_decl = NULL_TREE;
1019 /* Rather than write the code to handle the non-union case,
1020 just give an error. */
1021 if (TREE_CODE (type) != UNION_TYPE)
1022 error ("anonymous struct not inside named type");
1024 for (field = TYPE_FIELDS (type);
1026 field = TREE_CHAIN (field))
1031 if (DECL_ARTIFICIAL (field))
1033 if (TREE_CODE (field) != FIELD_DECL)
1035 pedwarn ("%q+#D invalid; an anonymous union can only "
1036 "have non-static data members", field);
1040 if (TREE_PRIVATE (field))
1041 pedwarn ("private member %q+#D in anonymous union", field);
1042 else if (TREE_PROTECTED (field))
1043 pedwarn ("protected member %q+#D in anonymous union", field);
1045 if (processing_template_decl)
1046 ref = build_min_nt (COMPONENT_REF, object,
1047 DECL_NAME (field), NULL_TREE);
1049 ref = build_class_member_access_expr (object, field, NULL_TREE,
1052 if (DECL_NAME (field))
1056 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1058 base = get_base_address (object);
1059 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1060 TREE_STATIC (decl) = TREE_STATIC (base);
1061 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1063 SET_DECL_VALUE_EXPR (decl, ref);
1064 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1066 decl = pushdecl (decl);
1068 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1069 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1073 if (main_decl == NULL_TREE)
1080 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1081 anonymous union, then all members must be laid out together. PUBLIC_P
1082 is nonzero if this union is not declared static. */
1085 finish_anon_union (tree anon_union_decl)
1091 if (anon_union_decl == error_mark_node)
1094 type = TREE_TYPE (anon_union_decl);
1095 public_p = TREE_PUBLIC (anon_union_decl);
1097 /* The VAR_DECL's context is the same as the TYPE's context. */
1098 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1100 if (TYPE_FIELDS (type) == NULL_TREE)
1105 error ("namespace-scope anonymous aggregates must be static");
1109 main_decl = build_anon_union_vars (type, anon_union_decl);
1110 if (main_decl == error_mark_node)
1112 if (main_decl == NULL_TREE)
1114 warning (0, "anonymous union with no members");
1118 if (!processing_template_decl)
1120 /* Use main_decl to set the mangled name. */
1121 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1122 mangle_decl (anon_union_decl);
1123 DECL_NAME (anon_union_decl) = NULL_TREE;
1126 pushdecl (anon_union_decl);
1127 if (building_stmt_tree ()
1128 && at_function_scope_p ())
1129 add_decl_expr (anon_union_decl);
1130 else if (!processing_template_decl)
1131 rest_of_decl_compilation (anon_union_decl,
1132 toplevel_bindings_p (), at_eof);
1135 /* Auxiliary functions to make type signatures for
1136 `operator new' and `operator delete' correspond to
1137 what compiler will be expecting. */
1140 coerce_new_type (tree type)
1143 tree args = TYPE_ARG_TYPES (type);
1145 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1147 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1150 error ("%<operator new%> must return type %qT", ptr_type_node);
1153 if (!args || args == void_list_node
1154 || !same_type_p (TREE_VALUE (args), size_type_node))
1157 if (args && args != void_list_node)
1158 args = TREE_CHAIN (args);
1159 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1160 "as first parameter", size_type_node);
1165 args = tree_cons (NULL_TREE, size_type_node, args);
1168 type = build_exception_variant
1169 (build_function_type (ptr_type_node, args),
1170 TYPE_RAISES_EXCEPTIONS (type));
1178 coerce_delete_type (tree type)
1181 tree args = TYPE_ARG_TYPES (type);
1183 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1185 if (!same_type_p (TREE_TYPE (type), void_type_node))
1188 error ("%<operator delete%> must return type %qT", void_type_node);
1191 if (!args || args == void_list_node
1192 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1195 if (args && args != void_list_node)
1196 args = TREE_CHAIN (args);
1197 error ("%<operator delete%> takes type %qT as first parameter",
1203 args = tree_cons (NULL_TREE, ptr_type_node, args);
1206 type = build_exception_variant
1207 (build_function_type (void_type_node, args),
1208 TYPE_RAISES_EXCEPTIONS (type));
1217 mark_vtable_entries (tree decl)
1220 unsigned HOST_WIDE_INT idx;
1222 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1227 STRIP_NOPS (fnaddr);
1229 if (TREE_CODE (fnaddr) != ADDR_EXPR
1230 && TREE_CODE (fnaddr) != FDESC_EXPR)
1231 /* This entry is an offset: a virtual base class offset, a
1232 virtual call offset, an RTTI offset, etc. */
1235 fn = TREE_OPERAND (fnaddr, 0);
1236 TREE_ADDRESSABLE (fn) = 1;
1237 /* When we don't have vcall offsets, we output thunks whenever
1238 we output the vtables that contain them. With vcall offsets,
1239 we know all the thunks we'll need when we emit a virtual
1240 function, so we emit the thunks there instead. */
1241 if (DECL_THUNK_P (fn))
1242 use_thunk (fn, /*emit_p=*/0);
1247 /* Set DECL up to have the closest approximation of "initialized common"
1248 linkage available. */
1251 comdat_linkage (tree decl)
1254 make_decl_one_only (decl);
1255 else if (TREE_CODE (decl) == FUNCTION_DECL
1256 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1257 /* We can just emit function and compiler-generated variables
1258 statically; having multiple copies is (for the most part) only
1261 There are two correctness issues, however: the address of a
1262 template instantiation with external linkage should be the
1263 same, independent of what translation unit asks for the
1264 address, and this will not hold when we emit multiple copies of
1265 the function. However, there's little else we can do.
1267 Also, by default, the typeinfo implementation assumes that
1268 there will be only one copy of the string used as the name for
1269 each type. Therefore, if weak symbols are unavailable, the
1270 run-time library should perform a more conservative check; it
1271 should perform a string comparison, rather than an address
1273 TREE_PUBLIC (decl) = 0;
1276 /* Static data member template instantiations, however, cannot
1277 have multiple copies. */
1278 if (DECL_INITIAL (decl) == 0
1279 || DECL_INITIAL (decl) == error_mark_node)
1280 DECL_COMMON (decl) = 1;
1281 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1283 DECL_COMMON (decl) = 1;
1284 DECL_INITIAL (decl) = error_mark_node;
1286 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1288 /* We can't do anything useful; leave vars for explicit
1290 DECL_EXTERNAL (decl) = 1;
1291 DECL_NOT_REALLY_EXTERN (decl) = 0;
1295 if (DECL_LANG_SPECIFIC (decl))
1296 DECL_COMDAT (decl) = 1;
1299 /* For win32 we also want to put explicit instantiations in
1300 linkonce sections, so that they will be merged with implicit
1301 instantiations; otherwise we get duplicate symbol errors.
1302 For Darwin we do not want explicit instantiations to be
1306 maybe_make_one_only (tree decl)
1308 /* We used to say that this was not necessary on targets that support weak
1309 symbols, because the implicit instantiations will defer to the explicit
1310 one. However, that's not actually the case in SVR4; a strong definition
1311 after a weak one is an error. Also, not making explicit
1312 instantiations one_only means that we can end up with two copies of
1313 some template instantiations. */
1317 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1318 we can get away with not emitting them if they aren't used. We need
1319 to for variables so that cp_finish_decl will update their linkage,
1320 because their DECL_INITIAL may not have been set properly yet. */
1322 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1323 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1324 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1326 make_decl_one_only (decl);
1328 if (TREE_CODE (decl) == VAR_DECL)
1330 DECL_COMDAT (decl) = 1;
1331 /* Mark it needed so we don't forget to emit it. */
1332 mark_decl_referenced (decl);
1337 /* Determine whether or not we want to specifically import or export CTYPE,
1338 using various heuristics. */
1341 import_export_class (tree ctype)
1343 /* -1 for imported, 1 for exported. */
1344 int import_export = 0;
1346 /* It only makes sense to call this function at EOF. The reason is
1347 that this function looks at whether or not the first non-inline
1348 non-abstract virtual member function has been defined in this
1349 translation unit. But, we can't possibly know that until we've
1350 seen the entire translation unit. */
1351 gcc_assert (at_eof);
1353 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1356 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1357 we will have CLASSTYPE_INTERFACE_ONLY set but not
1358 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1359 heuristic because someone will supply a #pragma implementation
1360 elsewhere, and deducing it here would produce a conflict. */
1361 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1364 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1366 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1368 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1369 && !flag_implicit_templates)
1370 /* For a template class, without -fimplicit-templates, check the
1371 repository. If the virtual table is assigned to this
1372 translation unit, then export the class; otherwise, import
1374 import_export = repo_export_class_p (ctype) ? 1 : -1;
1375 else if (TYPE_POLYMORPHIC_P (ctype))
1377 /* The ABI specifies that the virtual table and associated
1378 information are emitted with the key method, if any. */
1379 tree method = CLASSTYPE_KEY_METHOD (ctype);
1380 /* If weak symbol support is not available, then we must be
1381 careful not to emit the vtable when the key function is
1382 inline. An inline function can be defined in multiple
1383 translation units. If we were to emit the vtable in each
1384 translation unit containing a definition, we would get
1385 multiple definition errors at link-time. */
1386 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1387 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1390 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1391 a definition anywhere else. */
1392 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1395 /* Allow backends the chance to overrule the decision. */
1396 if (targetm.cxx.import_export_class)
1397 import_export = targetm.cxx.import_export_class (ctype, import_export);
1401 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1402 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1406 /* Return true if VAR has already been provided to the back end; in that
1407 case VAR should not be modified further by the front end. */
1409 var_finalized_p (tree var)
1411 return cgraph_varpool_node (var)->finalized;
1414 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1415 must be emitted in this translation unit. Mark it as such. */
1418 mark_needed (tree decl)
1420 /* It's possible that we no longer need to set
1421 TREE_SYMBOL_REFERENCED here directly, but doing so is
1423 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1424 mark_decl_referenced (decl);
1427 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1428 returns true if a definition of this entity should be provided in
1429 this object file. Callers use this function to determine whether
1430 or not to let the back end know that a definition of DECL is
1431 available in this translation unit. */
1434 decl_needed_p (tree decl)
1436 gcc_assert (TREE_CODE (decl) == VAR_DECL
1437 || TREE_CODE (decl) == FUNCTION_DECL);
1438 /* This function should only be called at the end of the translation
1439 unit. We cannot be sure of whether or not something will be
1440 COMDAT until that point. */
1441 gcc_assert (at_eof);
1443 /* All entities with external linkage that are not COMDAT should be
1444 emitted; they may be referred to from other object files. */
1445 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1447 /* If this entity was used, let the back-end see it; it will decide
1448 whether or not to emit it into the object file. */
1449 if (TREE_USED (decl)
1450 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1451 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1453 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1454 reference to DECL might cause it to be emitted later. */
1458 /* If necessary, write out the vtables for the dynamic class CTYPE.
1459 Returns true if any vtables were emitted. */
1462 maybe_emit_vtables (tree ctype)
1468 /* If the vtables for this class have already been emitted there is
1469 nothing more to do. */
1470 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1471 if (var_finalized_p (primary_vtbl))
1473 /* Ignore dummy vtables made by get_vtable_decl. */
1474 if (TREE_TYPE (primary_vtbl) == void_type_node)
1477 /* On some targets, we cannot determine the key method until the end
1478 of the translation unit -- which is when this function is
1480 if (!targetm.cxx.key_method_may_be_inline ())
1481 determine_key_method (ctype);
1483 /* See if any of the vtables are needed. */
1484 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1486 import_export_decl (vtbl);
1487 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1492 /* If the references to this class' vtables are optimized away,
1493 still emit the appropriate debugging information. See
1495 if (DECL_COMDAT (primary_vtbl)
1496 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1497 note_debug_info_needed (ctype);
1501 /* The ABI requires that we emit all of the vtables if we emit any
1503 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1505 /* Mark entities references from the virtual table as used. */
1506 mark_vtable_entries (vtbl);
1508 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1510 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1512 /* It had better be all done at compile-time. */
1517 DECL_EXTERNAL (vtbl) = 0;
1518 rest_of_decl_compilation (vtbl, 1, 1);
1520 /* Because we're only doing syntax-checking, we'll never end up
1521 actually marking the variable as written. */
1522 if (flag_syntax_only)
1523 TREE_ASM_WRITTEN (vtbl) = 1;
1526 /* Since we're writing out the vtable here, also write the debug
1528 note_debug_info_needed (ctype);
1533 /* A special return value from type_visibility meaning internal
1536 enum { VISIBILITY_STATIC = VISIBILITY_INTERNAL+1 };
1538 /* walk_tree helper function for type_visibility. */
1541 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1543 int *vis_p = (int *)data;
1548 else if (CLASS_TYPE_P (*tp))
1550 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1552 *vis_p = VISIBILITY_STATIC;
1555 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1556 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1561 /* Returns the visibility of TYPE, which is the minimum visibility of its
1565 type_visibility (tree type)
1567 int vis = VISIBILITY_DEFAULT;
1568 walk_tree_without_duplicates (&type, min_vis_r, &vis);
1572 /* Limit the visibility of DECL to VISIBILITY. SPECIFIED is true if the
1573 constraint comes from an attribute or pragma; REASON is the source of
1577 constrain_visibility (tree decl, int visibility, bool specified,
1580 if (visibility == VISIBILITY_STATIC)
1582 TREE_PUBLIC (decl) = 0;
1583 DECL_INTERFACE_KNOWN (decl) = 1;
1584 if (DECL_LANG_SPECIFIC (decl))
1585 DECL_NOT_REALLY_EXTERN (decl) = 1;
1587 else if (visibility > DECL_VISIBILITY (decl))
1589 if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)))
1590 warning (OPT_Wattributes, "%q+D: visibility attribute requests "
1591 "greater visibility than its %s allows", decl, reason);
1592 DECL_VISIBILITY (decl) = visibility;
1593 if (!DECL_VISIBILITY_SPECIFIED (decl))
1594 DECL_VISIBILITY_SPECIFIED (decl) = specified;
1600 /* Constrain the visibility of DECL based on the visibility of its template
1604 constrain_visibility_for_template (tree decl, tree targs)
1606 /* If this is a template instantiation, check the innermost
1607 template args for visibility constraints. The outer template
1608 args are covered by the class check. */
1609 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1611 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1615 tree arg = TREE_VEC_ELT (args, i-1);
1617 vis = type_visibility (arg);
1618 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1621 if (TREE_CODE (arg) == ADDR_EXPR)
1622 arg = TREE_OPERAND (arg, 0);
1623 if (TREE_CODE (arg) == VAR_DECL
1624 || TREE_CODE (arg) == FUNCTION_DECL)
1626 if (! TREE_PUBLIC (arg))
1627 vis = VISIBILITY_STATIC;
1629 vis = DECL_VISIBILITY (arg);
1633 constrain_visibility (decl, vis, false, "template parameter");
1637 /* Like c_determine_visibility, but with additional C++-specific
1640 Function-scope entities can rely on the function's visibility because
1641 it is set in start_preparsed_function.
1643 Class-scope entities cannot rely on the class's visibility until the end
1644 of the enclosing class definition.
1646 Note that because namespaces have multiple independent definitions,
1647 namespace visibility is handled elsewhere using the #pragma visibility
1648 machinery rather than by decorating the namespace declaration.
1650 The goal is for constraints from the type to give a diagnostic, and
1651 other constraints to be applied silently. */
1654 determine_visibility (tree decl)
1656 tree class_type = NULL_TREE;
1659 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1661 /* Only relevant for names with external linkage. */
1662 if (!TREE_PUBLIC (decl))
1665 /* Cloned constructors and destructors get the same visibility as
1666 the underlying function. That should be set up in
1667 maybe_clone_body. */
1668 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1670 if (TREE_CODE (decl) == TYPE_DECL)
1672 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1673 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1674 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1679 else if (DECL_LANG_SPECIFIC (decl))
1680 use_template = DECL_USE_TEMPLATE (decl);
1684 /* Anything that is exported must have default visibility. */
1685 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1686 && lookup_attribute ("dllexport",
1687 TREE_CODE (decl) == TYPE_DECL
1688 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
1689 : DECL_ATTRIBUTES (decl)))
1691 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1692 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1695 /* If DECL is a member of a class, visibility specifiers on the
1696 class can influence the visibility of the DECL. */
1697 if (DECL_CLASS_SCOPE_P (decl))
1698 class_type = DECL_CONTEXT (decl);
1699 else if (TREE_CODE (decl) == VAR_DECL
1700 && DECL_TINFO_P (decl)
1701 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1702 class_type = TREE_TYPE (DECL_NAME (decl));
1705 /* Not a class member. */
1707 /* Virtual tables have DECL_CONTEXT set to their associated class,
1708 so they are automatically handled above. */
1709 gcc_assert (TREE_CODE (decl) != VAR_DECL
1710 || !DECL_VTABLE_OR_VTT_P (decl));
1712 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1714 /* Local statics and classes get the visibility of their
1715 containing function by default, except that
1716 -fvisibility-inlines-hidden doesn't affect them. */
1717 tree fn = DECL_CONTEXT (decl);
1718 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1720 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1721 DECL_VISIBILITY_SPECIFIED (decl) =
1722 DECL_VISIBILITY_SPECIFIED (fn);
1725 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1727 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1728 but have no TEMPLATE_INFO, so don't try to check it. */
1731 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1733 /* tinfo visibility is based on the type it's for. */
1734 constrain_visibility
1735 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))),
1738 else if (use_template)
1739 /* Template instantiations and specializations get visibility based
1740 on their template unless they override it with an attribute. */;
1741 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1743 /* Set default visibility to whatever the user supplied with
1744 #pragma GCC visibility or a namespace visibility attribute. */
1745 DECL_VISIBILITY (decl) = default_visibility;
1746 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1752 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1753 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1754 : DECL_TEMPLATE_INFO (decl));
1755 tree args = TI_ARGS (tinfo);
1756 int depth = TMPL_ARGS_DEPTH (args);
1758 /* If the template has explicit visibility and the specialization
1759 doesn't, use the visibility from the template. */
1760 if (!DECL_VISIBILITY_SPECIFIED (decl))
1762 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1763 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1766 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1767 if (args && depth > template_class_depth (class_type))
1768 /* Don't let it have more visibility than its template type
1770 constrain_visibility_for_template (decl, args);
1774 determine_visibility_from_class (decl, class_type);
1776 /* Don't let it have more visibility than its type. */
1777 if (TREE_CODE (decl) != TYPE_DECL)
1778 if (constrain_visibility (decl, type_visibility (TREE_TYPE (decl)),
1780 warning (OPT_Wattributes, "\
1781 %q+D declared with greater visibility than its type",
1784 if (decl_anon_ns_mem_p (decl))
1785 /* Names in an anonymous namespace get internal linkage.
1786 This might change once we implement export. */
1787 constrain_visibility (decl, VISIBILITY_STATIC,
1788 false, "namespace");
1791 /* By default, static data members and function members receive
1792 the visibility of their containing class. */
1795 determine_visibility_from_class (tree decl, tree class_type)
1797 if (visibility_options.inlines_hidden
1798 /* Don't do this for inline templates; specializations might not be
1799 inline, and we don't want them to inherit the hidden
1800 visibility. We'll set it here for all inline instantiations. */
1801 && !processing_template_decl
1802 && ! DECL_VISIBILITY_SPECIFIED (decl)
1803 && TREE_CODE (decl) == FUNCTION_DECL
1804 && DECL_DECLARED_INLINE_P (decl))
1805 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1807 /* The decl can't have more visibility than its class. */
1808 constrain_visibility (decl, CLASSTYPE_VISIBILITY (class_type),
1809 CLASSTYPE_VISIBILITY_SPECIFIED (class_type),
1812 /* Give the target a chance to override the visibility associated
1814 if (TREE_CODE (decl) == VAR_DECL
1815 && (DECL_TINFO_P (decl)
1816 || (DECL_VTABLE_OR_VTT_P (decl)
1817 /* Construction virtual tables are not exported because
1818 they cannot be referred to from other object files;
1819 their name is not standardized by the ABI. */
1820 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1821 && TREE_PUBLIC (decl)
1822 && !DECL_REALLY_EXTERN (decl)
1823 && DECL_VISIBILITY_SPECIFIED (decl)
1824 && (!class_type || !CLASSTYPE_VISIBILITY_SPECIFIED (class_type)))
1825 targetm.cxx.determine_class_data_visibility (decl);
1828 /* Constrain the visibility of a class TYPE based on the visibility of its
1829 field types. Warn if any fields require lesser visibility. */
1832 constrain_class_visibility (tree type)
1834 tree decl = TYPE_MAIN_DECL (type);
1835 tree binfo = TYPE_BINFO (type);
1839 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1840 if (TREE_CODE (t) == FIELD_DECL)
1841 if (constrain_visibility (decl, type_visibility (TREE_TYPE (t)),
1842 false, "field type"))
1843 warning (OPT_Wattributes, "\
1844 %qT declared with greater visibility than the type of its field %qD",
1847 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1848 if (constrain_visibility (decl, type_visibility (TREE_TYPE (t)),
1849 false, "base type"))
1850 warning (OPT_Wattributes, "\
1851 %qT declared with greater visibility than its base %qT",
1852 type, TREE_TYPE (t));
1855 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1856 for DECL has not already been determined, do so now by setting
1857 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1858 function is called entities with vague linkage whose definitions
1859 are available must have TREE_PUBLIC set.
1861 If this function decides to place DECL in COMDAT, it will set
1862 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1863 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1864 callers defer that decision until it is clear that DECL is actually
1868 import_export_decl (tree decl)
1873 tree class_type = NULL_TREE;
1875 if (DECL_INTERFACE_KNOWN (decl))
1878 /* We cannot determine what linkage to give to an entity with vague
1879 linkage until the end of the file. For example, a virtual table
1880 for a class will be defined if and only if the key method is
1881 defined in this translation unit. As a further example, consider
1882 that when compiling a translation unit that uses PCH file with
1883 "-frepo" it would be incorrect to make decisions about what
1884 entities to emit when building the PCH; those decisions must be
1885 delayed until the repository information has been processed. */
1886 gcc_assert (at_eof);
1887 /* Object file linkage for explicit instantiations is handled in
1888 mark_decl_instantiated. For static variables in functions with
1889 vague linkage, maybe_commonize_var is used.
1891 Therefore, the only declarations that should be provided to this
1892 function are those with external linkage that are:
1894 * implicit instantiations of function templates
1898 * implicit instantiations of static data members of class
1905 Furthermore, all entities that reach this point must have a
1906 definition available in this translation unit.
1908 The following assertions check these conditions. */
1909 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1910 || TREE_CODE (decl) == VAR_DECL);
1911 /* Any code that creates entities with TREE_PUBLIC cleared should
1912 also set DECL_INTERFACE_KNOWN. */
1913 gcc_assert (TREE_PUBLIC (decl));
1914 if (TREE_CODE (decl) == FUNCTION_DECL)
1915 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1916 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1917 || DECL_DECLARED_INLINE_P (decl));
1919 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1920 || DECL_VTABLE_OR_VTT_P (decl)
1921 || DECL_TINFO_P (decl));
1922 /* Check that a definition of DECL is available in this translation
1924 gcc_assert (!DECL_REALLY_EXTERN (decl));
1926 /* Assume that DECL will not have COMDAT linkage. */
1928 /* Assume that DECL will not be imported into this translation
1932 /* See if the repository tells us whether or not to emit DECL in
1933 this translation unit. */
1934 emit_p = repo_emit_p (decl);
1937 else if (emit_p == 1)
1939 /* The repository indicates that this entity should be defined
1940 here. Make sure the back end honors that request. */
1941 if (TREE_CODE (decl) == VAR_DECL)
1943 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1944 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1947 FOR_EACH_CLONE (clone, decl)
1948 mark_needed (clone);
1952 /* Output the definition as an ordinary strong definition. */
1953 DECL_EXTERNAL (decl) = 0;
1954 DECL_INTERFACE_KNOWN (decl) = 1;
1959 /* We have already decided what to do with this DECL; there is no
1960 need to check anything further. */
1962 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1964 class_type = DECL_CONTEXT (decl);
1965 import_export_class (class_type);
1966 if (TYPE_FOR_JAVA (class_type))
1968 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
1969 && CLASSTYPE_INTERFACE_ONLY (class_type))
1971 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
1972 && !CLASSTYPE_USE_TEMPLATE (class_type)
1973 && CLASSTYPE_KEY_METHOD (class_type)
1974 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
1975 /* The ABI requires that all virtual tables be emitted with
1976 COMDAT linkage. However, on systems where COMDAT symbols
1977 don't show up in the table of contents for a static
1978 archive, or on systems without weak symbols (where we
1979 approximate COMDAT linkage by using internal linkage), the
1980 linker will report errors about undefined symbols because
1981 it will not see the virtual table definition. Therefore,
1982 in the case that we know that the virtual table will be
1983 emitted in only one translation unit, we make the virtual
1984 table an ordinary definition with external linkage. */
1985 DECL_EXTERNAL (decl) = 0;
1986 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
1988 /* CLASS_TYPE is being exported from this translation unit,
1989 so DECL should be defined here. */
1990 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
1991 /* If a class is declared in a header with the "extern
1992 template" extension, then it will not be instantiated,
1993 even in translation units that would normally require
1994 it. Often such classes are explicitly instantiated in
1995 one translation unit. Therefore, the explicit
1996 instantiation must be made visible to other translation
1998 DECL_EXTERNAL (decl) = 0;
2001 /* The generic C++ ABI says that class data is always
2002 COMDAT, even if there is a key function. Some
2003 variants (e.g., the ARM EABI) says that class data
2004 only has COMDAT linkage if the class data might be
2005 emitted in more than one translation unit. When the
2006 key method can be inline and is inline, we still have
2007 to arrange for comdat even though
2008 class_data_always_comdat is false. */
2009 if (!CLASSTYPE_KEY_METHOD (class_type)
2010 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2011 || targetm.cxx.class_data_always_comdat ())
2013 /* The ABI requires COMDAT linkage. Normally, we
2014 only emit COMDAT things when they are needed;
2015 make sure that we realize that this entity is
2022 else if (!flag_implicit_templates
2023 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2028 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2030 tree type = TREE_TYPE (DECL_NAME (decl));
2031 if (CLASS_TYPE_P (type))
2034 import_export_class (type);
2035 if (CLASSTYPE_INTERFACE_KNOWN (type)
2036 && TYPE_POLYMORPHIC_P (type)
2037 && CLASSTYPE_INTERFACE_ONLY (type)
2038 /* If -fno-rtti was specified, then we cannot be sure
2039 that RTTI information will be emitted with the
2040 virtual table of the class, so we must emit it
2041 wherever it is used. */
2046 if (CLASSTYPE_INTERFACE_KNOWN (type)
2047 && !CLASSTYPE_INTERFACE_ONLY (type))
2049 comdat_p = (targetm.cxx.class_data_always_comdat ()
2050 || (CLASSTYPE_KEY_METHOD (type)
2051 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2056 DECL_EXTERNAL (decl) = 0;
2066 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2067 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2069 /* DECL is an implicit instantiation of a function or static
2071 if (flag_implicit_templates
2072 || (flag_implicit_inline_templates
2073 && TREE_CODE (decl) == FUNCTION_DECL
2074 && DECL_DECLARED_INLINE_P (decl)))
2077 /* If we are not implicitly generating templates, then mark
2078 this entity as undefined in this translation unit. */
2081 else if (DECL_FUNCTION_MEMBER_P (decl))
2083 if (!DECL_DECLARED_INLINE_P (decl))
2085 tree ctype = DECL_CONTEXT (decl);
2086 import_export_class (ctype);
2087 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2089 DECL_NOT_REALLY_EXTERN (decl)
2090 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2091 || (DECL_DECLARED_INLINE_P (decl)
2092 && ! flag_implement_inlines
2093 && !DECL_VINDEX (decl)));
2095 if (!DECL_NOT_REALLY_EXTERN (decl))
2096 DECL_EXTERNAL (decl) = 1;
2098 /* Always make artificials weak. */
2099 if (DECL_ARTIFICIAL (decl) && flag_weak)
2102 maybe_make_one_only (decl);
2113 /* If we are importing DECL into this translation unit, mark is
2114 an undefined here. */
2115 DECL_EXTERNAL (decl) = 1;
2116 DECL_NOT_REALLY_EXTERN (decl) = 0;
2120 /* If we decided to put DECL in COMDAT, mark it accordingly at
2122 comdat_linkage (decl);
2125 DECL_INTERFACE_KNOWN (decl) = 1;
2128 /* Return an expression that performs the destruction of DECL, which
2129 must be a VAR_DECL whose type has a non-trivial destructor, or is
2130 an array whose (innermost) elements have a non-trivial destructor. */
2133 build_cleanup (tree decl)
2136 tree type = TREE_TYPE (decl);
2138 /* This function should only be called for declarations that really
2139 require cleanups. */
2140 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2142 /* Treat all objects with destructors as used; the destructor may do
2143 something substantive. */
2146 if (TREE_CODE (type) == ARRAY_TYPE)
2150 cxx_mark_addressable (decl);
2151 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
2153 temp = build_delete (TREE_TYPE (temp), temp,
2154 sfk_complete_destructor,
2155 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2159 /* Returns the initialization guard variable for the variable DECL,
2160 which has static storage duration. */
2163 get_guard (tree decl)
2168 sname = mangle_guard_variable (decl);
2169 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2174 /* We use a type that is big enough to contain a mutex as well
2175 as an integer counter. */
2176 guard_type = targetm.cxx.guard_type ();
2177 guard = build_decl (VAR_DECL, sname, guard_type);
2179 /* The guard should have the same linkage as what it guards. */
2180 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2181 TREE_STATIC (guard) = TREE_STATIC (decl);
2182 DECL_COMMON (guard) = DECL_COMMON (decl);
2183 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2184 if (TREE_PUBLIC (decl))
2185 DECL_WEAK (guard) = DECL_WEAK (decl);
2187 DECL_ARTIFICIAL (guard) = 1;
2188 DECL_IGNORED_P (guard) = 1;
2189 TREE_USED (guard) = 1;
2190 pushdecl_top_level_and_finish (guard, NULL_TREE);
2195 /* Return those bits of the GUARD variable that should be set when the
2196 guarded entity is actually initialized. */
2199 get_guard_bits (tree guard)
2201 if (!targetm.cxx.guard_mask_bit ())
2203 /* We only set the first byte of the guard, in order to leave room
2204 for a mutex in the high-order bits. */
2205 guard = build1 (ADDR_EXPR,
2206 build_pointer_type (TREE_TYPE (guard)),
2208 guard = build1 (NOP_EXPR,
2209 build_pointer_type (char_type_node),
2211 guard = build1 (INDIRECT_REF, char_type_node, guard);
2217 /* Return an expression which determines whether or not the GUARD
2218 variable has already been initialized. */
2221 get_guard_cond (tree guard)
2225 /* Check to see if the GUARD is zero. */
2226 guard = get_guard_bits (guard);
2228 /* Mask off all but the low bit. */
2229 if (targetm.cxx.guard_mask_bit ())
2231 guard_value = integer_one_node;
2232 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2233 guard_value = convert (TREE_TYPE (guard), guard_value);
2234 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2237 guard_value = integer_zero_node;
2238 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2239 guard_value = convert (TREE_TYPE (guard), guard_value);
2240 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2243 /* Return an expression which sets the GUARD variable, indicating that
2244 the variable being guarded has been initialized. */
2247 set_guard (tree guard)
2251 /* Set the GUARD to one. */
2252 guard = get_guard_bits (guard);
2253 guard_init = integer_one_node;
2254 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2255 guard_init = convert (TREE_TYPE (guard), guard_init);
2256 return build_modify_expr (guard, NOP_EXPR, guard_init);
2259 /* Start the process of running a particular set of global constructors
2260 or destructors. Subroutine of do_[cd]tors. */
2263 start_objects (int method_type, int initp)
2269 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2271 if (initp != DEFAULT_INIT_PRIORITY)
2281 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2284 sprintf (type, "%c", method_type);
2286 fndecl = build_lang_decl (FUNCTION_DECL,
2287 get_file_function_name_long (type),
2288 build_function_type (void_type_node,
2290 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2292 /* It can be a static function as long as collect2 does not have
2293 to scan the object file to find its ctor/dtor routine. */
2294 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2296 /* Mark this declaration as used to avoid spurious warnings. */
2297 TREE_USED (current_function_decl) = 1;
2299 /* Mark this function as a global constructor or destructor. */
2300 if (method_type == 'I')
2301 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2303 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2304 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2306 body = begin_compound_stmt (BCS_FN_BODY);
2308 /* We cannot allow these functions to be elided, even if they do not
2309 have external linkage. And, there's no point in deferring
2310 compilation of these functions; they're all going to have to be
2312 DECL_INLINE (current_function_decl) = 0;
2313 DECL_UNINLINABLE (current_function_decl) = 1;
2318 /* Finish the process of running a particular set of global constructors
2319 or destructors. Subroutine of do_[cd]tors. */
2322 finish_objects (int method_type, int initp, tree body)
2327 finish_compound_stmt (body);
2328 fn = finish_function (0);
2329 expand_or_defer_fn (fn);
2331 /* When only doing semantic analysis, and no RTL generation, we
2332 can't call functions that directly emit assembly code; there is
2333 no assembly file in which to put the code. */
2334 if (flag_syntax_only)
2337 if (targetm.have_ctors_dtors)
2339 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2340 cgraph_mark_needed_node (cgraph_node (fn));
2341 if (method_type == 'I')
2342 (* targetm.asm_out.constructor) (fnsym, initp);
2344 (* targetm.asm_out.destructor) (fnsym, initp);
2348 /* The names of the parameters to the function created to handle
2349 initializations and destructions for objects with static storage
2351 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2352 #define PRIORITY_IDENTIFIER "__priority"
2354 /* The name of the function we create to handle initializations and
2355 destructions for objects with static storage duration. */
2356 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2358 /* The declaration for the __INITIALIZE_P argument. */
2359 static GTY(()) tree initialize_p_decl;
2361 /* The declaration for the __PRIORITY argument. */
2362 static GTY(()) tree priority_decl;
2364 /* The declaration for the static storage duration function. */
2365 static GTY(()) tree ssdf_decl;
2367 /* All the static storage duration functions created in this
2368 translation unit. */
2369 static GTY(()) VEC(tree,gc) *ssdf_decls;
2371 /* A map from priority levels to information about that priority
2372 level. There may be many such levels, so efficient lookup is
2374 static splay_tree priority_info_map;
2376 /* Begins the generation of the function that will handle all
2377 initialization and destruction of objects with static storage
2378 duration. The function generated takes two parameters of type
2379 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2380 nonzero, it performs initializations. Otherwise, it performs
2381 destructions. It only performs those initializations or
2382 destructions with the indicated __PRIORITY. The generated function
2385 It is assumed that this function will only be called once per
2386 translation unit. */
2389 start_static_storage_duration_function (unsigned count)
2394 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2396 /* Create the identifier for this function. It will be of the form
2397 SSDF_IDENTIFIER_<number>. */
2398 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2400 /* Create the parameters. */
2401 parm_types = void_list_node;
2402 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2403 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2404 type = build_function_type (void_type_node, parm_types);
2406 /* Create the FUNCTION_DECL itself. */
2407 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2408 get_identifier (id),
2410 TREE_PUBLIC (ssdf_decl) = 0;
2411 DECL_ARTIFICIAL (ssdf_decl) = 1;
2413 /* Put this function in the list of functions to be called from the
2414 static constructors and destructors. */
2417 ssdf_decls = VEC_alloc (tree, gc, 32);
2419 /* Take this opportunity to initialize the map from priority
2420 numbers to information about that priority level. */
2421 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2422 /*delete_key_fn=*/0,
2423 /*delete_value_fn=*/
2424 (splay_tree_delete_value_fn) &free);
2426 /* We always need to generate functions for the
2427 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2428 priorities later, we'll be sure to find the
2429 DEFAULT_INIT_PRIORITY. */
2430 get_priority_info (DEFAULT_INIT_PRIORITY);
2433 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2435 /* Create the argument list. */
2436 initialize_p_decl = cp_build_parm_decl
2437 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2438 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2439 TREE_USED (initialize_p_decl) = 1;
2440 priority_decl = cp_build_parm_decl
2441 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2442 DECL_CONTEXT (priority_decl) = ssdf_decl;
2443 TREE_USED (priority_decl) = 1;
2445 TREE_CHAIN (initialize_p_decl) = priority_decl;
2446 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2448 /* Put the function in the global scope. */
2449 pushdecl (ssdf_decl);
2451 /* Start the function itself. This is equivalent to declaring the
2454 static void __ssdf (int __initialize_p, init __priority_p);
2456 It is static because we only need to call this function from the
2457 various constructor and destructor functions for this module. */
2458 start_preparsed_function (ssdf_decl,
2459 /*attrs=*/NULL_TREE,
2462 /* Set up the scope of the outermost block in the function. */
2463 body = begin_compound_stmt (BCS_FN_BODY);
2465 /* This function must not be deferred because we are depending on
2466 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2467 DECL_INLINE (ssdf_decl) = 0;
2468 DECL_UNINLINABLE (ssdf_decl) = 1;
2473 /* Finish the generation of the function which performs initialization
2474 and destruction of objects with static storage duration. After
2475 this point, no more such objects can be created. */
2478 finish_static_storage_duration_function (tree body)
2480 /* Close out the function. */
2481 finish_compound_stmt (body);
2482 expand_or_defer_fn (finish_function (0));
2485 /* Return the information about the indicated PRIORITY level. If no
2486 code to handle this level has yet been generated, generate the
2487 appropriate prologue. */
2489 static priority_info
2490 get_priority_info (int priority)
2495 n = splay_tree_lookup (priority_info_map,
2496 (splay_tree_key) priority);
2499 /* Create a new priority information structure, and insert it
2501 pi = XNEW (struct priority_info_s);
2502 pi->initializations_p = 0;
2503 pi->destructions_p = 0;
2504 splay_tree_insert (priority_info_map,
2505 (splay_tree_key) priority,
2506 (splay_tree_value) pi);
2509 pi = (priority_info) n->value;
2514 /* The effective initialization priority of a DECL. */
2516 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2517 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2518 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2520 /* Whether a DECL needs a guard to protect it against multiple
2523 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2524 || DECL_ONE_ONLY (decl) \
2525 || DECL_WEAK (decl)))
2527 /* Set up to handle the initialization or destruction of DECL. If
2528 INITP is nonzero, we are initializing the variable. Otherwise, we
2529 are destroying it. */
2532 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2534 tree guard_if_stmt = NULL_TREE;
2537 /* If we are supposed to destruct and there's a trivial destructor,
2538 nothing has to be done. */
2540 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2543 /* Trick the compiler into thinking we are at the file and line
2544 where DECL was declared so that error-messages make sense, and so
2545 that the debugger will show somewhat sensible file and line
2547 input_location = DECL_SOURCE_LOCATION (decl);
2553 Access control for implicit calls to the constructors,
2554 the conversion functions, or the destructor called to
2555 create and destroy a static data member is performed as
2556 if these calls appeared in the scope of the member's
2559 we pretend we are in a static member function of the class of
2560 which the DECL is a member. */
2561 if (member_p (decl))
2563 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2564 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2567 /* Assume we don't need a guard. */
2569 /* We need a guard if this is an object with external linkage that
2570 might be initialized in more than one place. (For example, a
2571 static data member of a template, when the data member requires
2573 if (NEEDS_GUARD_P (decl))
2577 guard = get_guard (decl);
2579 /* When using __cxa_atexit, we just check the GUARD as we would
2580 for a local static. */
2581 if (flag_use_cxa_atexit)
2583 /* When using __cxa_atexit, we never try to destroy
2584 anything from a static destructor. */
2586 guard_cond = get_guard_cond (guard);
2588 /* If we don't have __cxa_atexit, then we will be running
2589 destructors from .fini sections, or their equivalents. So,
2590 we need to know how many times we've tried to initialize this
2591 object. We do initializations only if the GUARD is zero,
2592 i.e., if we are the first to initialize the variable. We do
2593 destructions only if the GUARD is one, i.e., if we are the
2594 last to destroy the variable. */
2597 = cp_build_binary_op (EQ_EXPR,
2598 build_unary_op (PREINCREMENT_EXPR,
2604 = cp_build_binary_op (EQ_EXPR,
2605 build_unary_op (PREDECREMENT_EXPR,
2610 guard_if_stmt = begin_if_stmt ();
2611 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2615 /* If we're using __cxa_atexit, we have not already set the GUARD,
2616 so we must do so now. */
2617 if (guard && initp && flag_use_cxa_atexit)
2618 finish_expr_stmt (set_guard (guard));
2620 /* Perform the initialization or destruction. */
2624 finish_expr_stmt (init);
2626 /* If we're using __cxa_atexit, register a function that calls the
2627 destructor for the object. */
2628 if (flag_use_cxa_atexit)
2629 finish_expr_stmt (register_dtor_fn (decl));
2632 finish_expr_stmt (build_cleanup (decl));
2634 /* Finish the guard if-stmt, if necessary. */
2637 finish_then_clause (guard_if_stmt);
2638 finish_if_stmt (guard_if_stmt);
2641 /* Now that we're done with DECL we don't need to pretend to be a
2642 member of its class any longer. */
2643 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2644 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2647 /* Generate code to do the initialization or destruction of the decls in VARS,
2648 a TREE_LIST of VAR_DECL with static storage duration.
2649 Whether initialization or destruction is performed is specified by INITP. */
2652 do_static_initialization_or_destruction (tree vars, bool initp)
2654 tree node, init_if_stmt, cond;
2656 /* Build the outer if-stmt to check for initialization or destruction. */
2657 init_if_stmt = begin_if_stmt ();
2658 cond = initp ? integer_one_node : integer_zero_node;
2659 cond = cp_build_binary_op (EQ_EXPR,
2662 finish_if_stmt_cond (cond, init_if_stmt);
2666 tree decl = TREE_VALUE (node);
2667 tree priority_if_stmt;
2671 /* If we don't need a destructor, there's nothing to do. Avoid
2672 creating a possibly empty if-stmt. */
2673 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2675 node = TREE_CHAIN (node);
2679 /* Remember that we had an initialization or finalization at this
2681 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2682 pi = get_priority_info (priority);
2684 pi->initializations_p = 1;
2686 pi->destructions_p = 1;
2688 /* Conditionalize this initialization on being in the right priority
2689 and being initializing/finalizing appropriately. */
2690 priority_if_stmt = begin_if_stmt ();
2691 cond = cp_build_binary_op (EQ_EXPR,
2693 build_int_cst (NULL_TREE, priority));
2694 finish_if_stmt_cond (cond, priority_if_stmt);
2696 /* Process initializers with same priority. */
2698 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2699 node = TREE_CHAIN (node))
2700 /* Do one initialization or destruction. */
2701 one_static_initialization_or_destruction (TREE_VALUE (node),
2702 TREE_PURPOSE (node), initp);
2704 /* Finish up the priority if-stmt body. */
2705 finish_then_clause (priority_if_stmt);
2706 finish_if_stmt (priority_if_stmt);
2710 /* Finish up the init/destruct if-stmt body. */
2711 finish_then_clause (init_if_stmt);
2712 finish_if_stmt (init_if_stmt);
2715 /* VARS is a list of variables with static storage duration which may
2716 need initialization and/or finalization. Remove those variables
2717 that don't really need to be initialized or finalized, and return
2718 the resulting list. The order in which the variables appear in
2719 VARS is in reverse order of the order in which they should actually
2720 be initialized. The list we return is in the unreversed order;
2721 i.e., the first variable should be initialized first. */
2724 prune_vars_needing_no_initialization (tree *vars)
2727 tree result = NULL_TREE;
2732 tree decl = TREE_VALUE (t);
2733 tree init = TREE_PURPOSE (t);
2735 /* Deal gracefully with error. */
2736 if (decl == error_mark_node)
2738 var = &TREE_CHAIN (t);
2742 /* The only things that can be initialized are variables. */
2743 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2745 /* If this object is not defined, we don't need to do anything
2747 if (DECL_EXTERNAL (decl))
2749 var = &TREE_CHAIN (t);
2753 /* Also, if the initializer already contains errors, we can bail
2755 if (init && TREE_CODE (init) == TREE_LIST
2756 && value_member (error_mark_node, init))
2758 var = &TREE_CHAIN (t);
2762 /* This variable is going to need initialization and/or
2763 finalization, so we add it to the list. */
2764 *var = TREE_CHAIN (t);
2765 TREE_CHAIN (t) = result;
2772 /* Make sure we have told the back end about all the variables in
2776 write_out_vars (tree vars)
2780 for (v = vars; v; v = TREE_CHAIN (v))
2782 tree var = TREE_VALUE (v);
2783 if (!var_finalized_p (var))
2785 import_export_decl (var);
2786 rest_of_decl_compilation (var, 1, 1);
2791 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2792 (otherwise) that will initialize all gobal objects with static
2793 storage duration having the indicated PRIORITY. */
2796 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2805 input_location = *locus;
2806 #ifdef USE_MAPPED_LOCATION
2812 /* We use `I' to indicate initialization and `D' to indicate
2814 function_key = constructor_p ? 'I' : 'D';
2816 /* We emit the function lazily, to avoid generating empty
2817 global constructors and destructors. */
2820 /* For Objective-C++, we may need to initialize metadata found in this module.
2821 This must be done _before_ any other static initializations. */
2822 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2823 && constructor_p && objc_static_init_needed_p ())
2825 body = start_objects (function_key, priority);
2826 static_ctors = objc_generate_static_init_call (static_ctors);
2829 /* Call the static storage duration function with appropriate
2831 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2833 /* Calls to pure or const functions will expand to nothing. */
2834 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2837 body = start_objects (function_key, priority);
2839 arguments = tree_cons (NULL_TREE,
2840 build_int_cst (NULL_TREE, priority),
2842 arguments = tree_cons (NULL_TREE,
2843 build_int_cst (NULL_TREE, constructor_p),
2845 finish_expr_stmt (build_function_call (fndecl, arguments));
2849 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2850 calls to any functions marked with attributes indicating that
2851 they should be called at initialization- or destruction-time. */
2852 if (priority == DEFAULT_INIT_PRIORITY)
2856 for (fns = constructor_p ? static_ctors : static_dtors;
2858 fns = TREE_CHAIN (fns))
2860 fndecl = TREE_VALUE (fns);
2862 /* Calls to pure/const functions will expand to nothing. */
2863 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2866 body = start_objects (function_key, priority);
2867 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2872 /* Close out the function. */
2874 finish_objects (function_key, priority, body);
2877 /* Generate constructor and destructor functions for the priority
2881 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2883 location_t *locus = (location_t *) data;
2884 int priority = (int) n->key;
2885 priority_info pi = (priority_info) n->value;
2887 /* Generate the functions themselves, but only if they are really
2889 if (pi->initializations_p
2890 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2891 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2892 if (pi->destructions_p
2893 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2894 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2896 /* Keep iterating. */
2900 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2901 decls referenced from frontend specific constructs; it will be called
2902 only for language-specific tree nodes.
2904 Here we must deal with member pointers. */
2907 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2908 tree from ATTRIBUTE_UNUSED)
2912 switch (TREE_CODE (t))
2915 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2916 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2919 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2920 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2923 if (DECL_VTABLE_OR_VTT_P (t))
2925 /* The ABI requires that all virtual tables be emitted
2926 whenever one of them is. */
2928 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2930 vtbl = TREE_CHAIN (vtbl))
2931 mark_decl_referenced (vtbl);
2933 else if (DECL_CONTEXT (t)
2934 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2935 /* If we need a static variable in a function, then we
2936 need the containing function. */
2937 mark_decl_referenced (DECL_CONTEXT (t));
2946 /* Java requires that we be able to reference a local address for a
2947 method, and not be confused by PLT entries. If hidden aliases are
2948 supported, emit one for each java function that we've emitted. */
2951 build_java_method_aliases (void)
2953 struct cgraph_node *node;
2955 #ifndef HAVE_GAS_HIDDEN
2959 for (node = cgraph_nodes; node ; node = node->next)
2961 tree fndecl = node->decl;
2963 if (TREE_ASM_WRITTEN (fndecl)
2964 && DECL_CONTEXT (fndecl)
2965 && TYPE_P (DECL_CONTEXT (fndecl))
2966 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2967 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
2969 /* Mangle the name in a predictable way; we need to reference
2970 this from a java compiled object file. */
2971 tree oid, nid, alias;
2975 oid = DECL_ASSEMBLER_NAME (fndecl);
2976 oname = IDENTIFIER_POINTER (oid);
2977 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
2978 nname = ACONCAT (("_ZGA", oname+2, NULL));
2979 nid = get_identifier (nname);
2981 alias = make_alias_for (fndecl, nid);
2982 TREE_PUBLIC (alias) = 1;
2983 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
2985 assemble_alias (alias, oid);
2990 /* This routine is called from the last rule in yyparse ().
2991 Its job is to create all the code needed to initialize and
2992 destroy the global aggregates. We do the destruction
2993 first, since that way we only need to reverse the decls once. */
2996 cp_finish_file (void)
3002 unsigned ssdf_count = 0;
3006 locus = input_location;
3009 /* Bad parse errors. Just forget about it. */
3010 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3014 c_common_write_pch ();
3016 #ifdef USE_MAPPED_LOCATION
3019 /* Otherwise, GDB can get confused, because in only knows
3020 about source for LINENO-1 lines. */
3024 /* We now have to write out all the stuff we put off writing out.
3027 o Template specializations that we have not yet instantiated,
3028 but which are needed.
3029 o Initialization and destruction for non-local objects with
3030 static storage duration. (Local objects with static storage
3031 duration are initialized when their scope is first entered,
3032 and are cleaned up via atexit.)
3033 o Virtual function tables.
3035 All of these may cause others to be needed. For example,
3036 instantiating one function may cause another to be needed, and
3037 generating the initializer for an object may cause templates to be
3038 instantiated, etc., etc. */
3040 timevar_push (TV_VARCONST);
3042 emit_support_tinfos ();
3051 /* If there are templates that we've put off instantiating, do
3053 instantiate_pending_templates (retries);
3056 /* Write out virtual tables as required. Note that writing out
3057 the virtual table for a template class may cause the
3058 instantiation of members of that class. If we write out
3059 vtables then we remove the class from our list so we don't
3060 have to look at it again. */
3062 while (keyed_classes != NULL_TREE
3063 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3066 keyed_classes = TREE_CHAIN (keyed_classes);
3072 tree next = TREE_CHAIN (t);
3076 if (maybe_emit_vtables (TREE_VALUE (next)))
3079 TREE_CHAIN (t) = TREE_CHAIN (next);
3084 next = TREE_CHAIN (t);
3088 /* Write out needed type info variables. We have to be careful
3089 looping through unemitted decls, because emit_tinfo_decl may
3090 cause other variables to be needed. New elements will be
3091 appended, and we remove from the vector those that actually
3093 for (i = VEC_length (tree, unemitted_tinfo_decls);
3094 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3095 if (emit_tinfo_decl (t))
3098 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3101 /* The list of objects with static storage duration is built up
3102 in reverse order. We clear STATIC_AGGREGATES so that any new
3103 aggregates added during the initialization of these will be
3104 initialized in the correct order when we next come around the
3106 vars = prune_vars_needing_no_initialization (&static_aggregates);
3110 /* We need to start a new initialization function each time
3111 through the loop. That's because we need to know which
3112 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3113 isn't computed until a function is finished, and written
3114 out. That's a deficiency in the back-end. When this is
3115 fixed, these initialization functions could all become
3116 inline, with resulting performance improvements. */
3119 /* Set the line and file, so that it is obviously not from
3121 input_location = locus;
3122 ssdf_body = start_static_storage_duration_function (ssdf_count);
3124 /* Make sure the back end knows about all the variables. */
3125 write_out_vars (vars);
3127 /* First generate code to do all the initializations. */
3129 do_static_initialization_or_destruction (vars, /*initp=*/true);
3131 /* Then, generate code to do all the destructions. Do these
3132 in reverse order so that the most recently constructed
3133 variable is the first destroyed. If we're using
3134 __cxa_atexit, then we don't need to do this; functions
3135 were registered at initialization time to destroy the
3137 if (!flag_use_cxa_atexit && vars)
3139 vars = nreverse (vars);
3140 do_static_initialization_or_destruction (vars, /*initp=*/false);
3145 /* Finish up the static storage duration function for this
3147 input_location = locus;
3148 finish_static_storage_duration_function (ssdf_body);
3150 /* All those initializations and finalizations might cause
3151 us to need more inline functions, more template
3152 instantiations, etc. */
3155 #ifdef USE_MAPPED_LOCATION
3162 /* Go through the set of inline functions whose bodies have not
3163 been emitted yet. If out-of-line copies of these functions
3164 are required, emit them. */
3165 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3167 /* Does it need synthesizing? */
3168 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3169 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3171 /* Even though we're already at the top-level, we push
3172 there again. That way, when we pop back a few lines
3173 hence, all of our state is restored. Otherwise,
3174 finish_function doesn't clean things up, and we end
3175 up with CURRENT_FUNCTION_DECL set. */
3176 push_to_top_level ();
3177 /* The decl's location will mark where it was first
3178 needed. Save that so synthesize method can indicate
3179 where it was needed from, in case of error */
3180 input_location = DECL_SOURCE_LOCATION (decl);
3181 synthesize_method (decl);
3182 pop_from_top_level ();
3186 if (!DECL_SAVED_TREE (decl))
3189 /* We lie to the back-end, pretending that some functions
3190 are not defined when they really are. This keeps these
3191 functions from being put out unnecessarily. But, we must
3192 stop lying when the functions are referenced, or if they
3193 are not comdat since they need to be put out now. If
3194 DECL_INTERFACE_KNOWN, then we have already set
3195 DECL_EXTERNAL appropriately, so there's no need to check
3196 again, and we do not want to clear DECL_EXTERNAL if a
3197 previous call to import_export_decl set it.
3199 This is done in a separate for cycle, because if some
3200 deferred function is contained in another deferred
3201 function later in deferred_fns varray,
3202 rest_of_compilation would skip this function and we
3203 really cannot expand the same function twice. */
3204 import_export_decl (decl);
3205 if (DECL_NOT_REALLY_EXTERN (decl)
3206 && DECL_INITIAL (decl)
3207 && decl_needed_p (decl))
3208 DECL_EXTERNAL (decl) = 0;
3210 /* If we're going to need to write this function out, and
3211 there's already a body for it, create RTL for it now.
3212 (There might be no body if this is a method we haven't
3213 gotten around to synthesizing yet.) */
3214 if (!DECL_EXTERNAL (decl)
3215 && decl_needed_p (decl)
3216 && !TREE_ASM_WRITTEN (decl)
3217 && !cgraph_node (decl)->local.finalized)
3219 /* We will output the function; no longer consider it in this
3221 DECL_DEFER_OUTPUT (decl) = 0;
3222 /* Generate RTL for this function now that we know we
3224 expand_or_defer_fn (decl);
3225 /* If we're compiling -fsyntax-only pretend that this
3226 function has been written out so that we don't try to
3228 if (flag_syntax_only)
3229 TREE_ASM_WRITTEN (decl) = 1;
3234 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3237 /* Static data members are just like namespace-scope globals. */
3238 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3240 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3242 import_export_decl (decl);
3243 /* If this static data member is needed, provide it to the
3245 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3246 DECL_EXTERNAL (decl) = 0;
3248 if (VEC_length (tree, pending_statics) != 0
3249 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3250 VEC_length (tree, pending_statics)))
3257 /* All used inline functions must have a definition at this point. */
3258 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3260 if (/* Check online inline functions that were actually used. */
3261 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3262 /* If the definition actually was available here, then the
3263 fact that the function was not defined merely represents
3264 that for some reason (use of a template repository,
3265 #pragma interface, etc.) we decided not to emit the
3267 && !DECL_INITIAL (decl)
3268 /* An explicit instantiation can be used to specify
3269 that the body is in another unit. It will have
3270 already verified there was a definition. */
3271 && !DECL_EXPLICIT_INSTANTIATION (decl))
3273 warning (0, "inline function %q+D used but never defined", decl);
3274 /* Avoid a duplicate warning from check_global_declaration_1. */
3275 TREE_NO_WARNING (decl) = 1;
3279 /* We give C linkage to static constructors and destructors. */
3280 push_lang_context (lang_name_c);
3282 /* Generate initialization and destruction functions for all
3283 priorities for which they are required. */
3284 if (priority_info_map)
3285 splay_tree_foreach (priority_info_map,
3286 generate_ctor_and_dtor_functions_for_priority,
3290 /* If we have a ctor or this is obj-c++ and we need a static init,
3291 call generate_ctor_or_dtor_function. */
3292 if (static_ctors || (c_dialect_objc () && objc_static_init_needed_p ()))
3293 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3294 DEFAULT_INIT_PRIORITY, &locus);
3296 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3297 DEFAULT_INIT_PRIORITY, &locus);
3300 /* We're done with the splay-tree now. */
3301 if (priority_info_map)
3302 splay_tree_delete (priority_info_map);
3304 /* Generate any missing aliases. */
3305 maybe_apply_pending_pragma_weaks ();
3307 /* We're done with static constructors, so we can go back to "C++"
3309 pop_lang_context ();
3311 cgraph_finalize_compilation_unit ();
3314 /* Now, issue warnings about static, but not defined, functions,
3315 etc., and emit debugging information. */
3316 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3317 if (VEC_length (tree, pending_statics) != 0)
3319 check_global_declarations (VEC_address (tree, pending_statics),
3320 VEC_length (tree, pending_statics));
3321 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3322 VEC_length (tree, pending_statics));
3325 /* Generate hidden aliases for Java. */
3326 build_java_method_aliases ();
3330 /* The entire file is now complete. If requested, dump everything
3334 FILE *stream = dump_begin (TDI_tu, &flags);
3338 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3339 dump_end (TDI_tu, stream);
3343 timevar_pop (TV_VARCONST);
3345 if (flag_detailed_statistics)
3347 dump_tree_statistics ();
3348 dump_time_statistics ();
3350 input_location = locus;
3352 #ifdef ENABLE_CHECKING
3353 validate_conversion_obstack ();
3354 #endif /* ENABLE_CHECKING */
3357 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3358 function to call in parse-tree form; it has not yet been
3359 semantically analyzed. ARGS are the arguments to the function.
3360 They have already been semantically analyzed. */
3363 build_offset_ref_call_from_tree (tree fn, tree args)
3372 object = TREE_OPERAND (fn, 0);
3374 if (processing_template_decl)
3376 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3377 || TREE_CODE (fn) == MEMBER_REF);
3378 if (type_dependent_expression_p (fn)
3379 || any_type_dependent_arguments_p (args))
3380 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3382 /* Transform the arguments and add the implicit "this"
3383 parameter. That must be done before the FN is transformed
3384 because we depend on the form of FN. */
3385 args = build_non_dependent_args (args);
3386 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3387 object = build_unary_op (ADDR_EXPR, object, 0);
3388 object = build_non_dependent_expr (object);
3389 args = tree_cons (NULL_TREE, object, args);
3390 /* Now that the arguments are done, transform FN. */
3391 fn = build_non_dependent_expr (fn);
3394 /* A qualified name corresponding to a bound pointer-to-member is
3395 represented as an OFFSET_REF:
3397 struct B { void g(); };
3399 void B::g() { (this->*p)(); } */
3400 if (TREE_CODE (fn) == OFFSET_REF)
3402 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3403 fn = TREE_OPERAND (fn, 1);
3404 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3405 args = tree_cons (NULL_TREE, object_addr, args);
3408 expr = build_function_call (fn, args);
3409 if (processing_template_decl && expr != error_mark_node)
3410 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3416 check_default_args (tree x)
3418 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3419 bool saw_def = false;
3420 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3421 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3423 if (TREE_PURPOSE (arg))
3427 error ("default argument missing for parameter %P of %q+#D", i, x);
3428 TREE_PURPOSE (arg) = error_mark_node;
3433 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3434 If DECL is a specialization or implicitly declared class member,
3435 generate the actual definition. */
3438 mark_used (tree decl)
3440 HOST_WIDE_INT saved_processing_template_decl = 0;
3442 /* If DECL is a BASELINK for a single function, then treat it just
3443 like the DECL for the function. Otherwise, if the BASELINK is
3444 for an overloaded function, we don't know which function was
3445 actually used until after overload resolution. */
3446 if (TREE_CODE (decl) == BASELINK)
3448 decl = BASELINK_FUNCTIONS (decl);
3449 if (really_overloaded_fn (decl))
3451 decl = OVL_CURRENT (decl);
3454 TREE_USED (decl) = 1;
3455 /* If we don't need a value, then we don't need to synthesize DECL. */
3456 if (skip_evaluation)
3458 /* Normally, we can wait until instantiation-time to synthesize
3459 DECL. However, if DECL is a static data member initialized with
3460 a constant, we need the value right now because a reference to
3461 such a data member is not value-dependent. */
3462 if (TREE_CODE (decl) == VAR_DECL
3463 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3464 && DECL_CLASS_SCOPE_P (decl))
3466 /* Don't try to instantiate members of dependent types. We
3467 cannot just use dependent_type_p here because this function
3468 may be called from fold_non_dependent_expr, and then we may
3469 see dependent types, even though processing_template_decl
3471 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3472 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3474 /* Pretend that we are not in a template, even if we are, so
3475 that the static data member initializer will be processed. */
3476 saved_processing_template_decl = processing_template_decl;
3477 processing_template_decl = 0;
3480 if (processing_template_decl)
3483 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3484 && !TREE_ASM_WRITTEN (decl))
3485 /* Remember it, so we can check it was defined. */
3487 if (DECL_DEFERRED_FN (decl))
3490 /* Remember the current location for a function we will end up
3491 synthesizing. Then we can inform the user where it was
3492 required in the case of error. */
3493 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3494 && !DECL_THUNK_P (decl))
3495 DECL_SOURCE_LOCATION (decl) = input_location;
3497 note_vague_linkage_fn (decl);
3500 assemble_external (decl);
3502 /* Is it a synthesized method that needs to be synthesized? */
3503 if (TREE_CODE (decl) == FUNCTION_DECL
3504 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3505 && DECL_ARTIFICIAL (decl)
3506 && !DECL_THUNK_P (decl)
3507 && ! DECL_INITIAL (decl)
3508 /* Kludge: don't synthesize for default args. Unfortunately this
3509 rules out initializers of namespace-scoped objects too, but
3510 it's sort-of ok if the implicit ctor or dtor decl keeps
3511 pointing to the class location. */
3512 && current_function_decl)
3514 synthesize_method (decl);
3515 /* If we've already synthesized the method we don't need to
3516 do the instantiation test below. */
3518 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3519 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3520 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3521 || (TREE_CODE (decl) == FUNCTION_DECL
3522 && DECL_INLINE (DECL_TEMPLATE_RESULT
3523 (template_for_substitution (decl))))
3524 /* We need to instantiate static data members so that there
3525 initializers are available in integral constant
3527 || (TREE_CODE (decl) == VAR_DECL
3528 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3529 /* If this is a function or variable that is an instance of some
3530 template, we now know that we will need to actually do the
3531 instantiation. We check that DECL is not an explicit
3532 instantiation because that is not checked in instantiate_decl.
3534 We put off instantiating functions in order to improve compile
3535 times. Maintaining a stack of active functions is expensive,
3536 and the inliner knows to instantiate any functions it might
3537 need. Therefore, we always try to defer instantiation. */
3538 instantiate_decl (decl, /*defer_ok=*/true,
3539 /*expl_inst_class_mem_p=*/false);
3541 processing_template_decl = saved_processing_template_decl;
3544 #include "gt-cp-decl2.h"