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 /* The parser rejects template declarations in local classes. */
449 gcc_assert (!current_function_decl);
450 /* The parser rejects any use of virtual in a function template. */
451 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
452 && DECL_VIRTUAL_P (decl)));
454 /* The debug-information generating code doesn't know what to do
455 with member templates. */
456 DECL_IGNORED_P (tmpl) = 1;
459 error ("template declaration of %q#D", decl);
462 /* Return true iff TYPE is a valid Java parameter or return type. */
465 acceptable_java_type (tree type)
467 if (type == error_mark_node)
470 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
472 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
474 type = TREE_TYPE (type);
475 if (TREE_CODE (type) == RECORD_TYPE)
478 if (! TYPE_FOR_JAVA (type))
480 if (! CLASSTYPE_TEMPLATE_INFO (type))
482 args = CLASSTYPE_TI_ARGS (type);
483 i = TREE_VEC_LENGTH (args);
486 type = TREE_VEC_ELT (args, i);
487 if (TREE_CODE (type) == POINTER_TYPE)
488 type = TREE_TYPE (type);
489 if (! TYPE_FOR_JAVA (type))
498 /* For a METHOD in a Java class CTYPE, return true if
499 the parameter and return types are valid Java types.
500 Otherwise, print appropriate error messages, and return false. */
503 check_java_method (tree method)
506 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
507 tree ret_type = TREE_TYPE (TREE_TYPE (method));
509 if (!acceptable_java_type (ret_type))
511 error ("Java method %qD has non-Java return type %qT",
516 arg_types = TREE_CHAIN (arg_types);
517 if (DECL_HAS_IN_CHARGE_PARM_P (method))
518 arg_types = TREE_CHAIN (arg_types);
519 if (DECL_HAS_VTT_PARM_P (method))
520 arg_types = TREE_CHAIN (arg_types);
522 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
524 tree type = TREE_VALUE (arg_types);
525 if (!acceptable_java_type (type))
527 if (type != error_mark_node)
528 error ("Java method %qD has non-Java parameter type %qT",
536 /* Sanity check: report error if this function FUNCTION is not
537 really a member of the class (CTYPE) it is supposed to belong to.
538 TEMPLATE_PARMS is used to specify the template parameters of a member
539 template passed as FUNCTION_DECL. If the member template is passed as a
540 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
541 from the declaration. If the function is not a function template, it
543 It returns the original declaration for the function, or NULL_TREE
544 if no declaration was found (and an error was emitted). */
547 check_classfn (tree ctype, tree function, tree template_parms)
553 if (DECL_USE_TEMPLATE (function)
554 && !(TREE_CODE (function) == TEMPLATE_DECL
555 && DECL_TEMPLATE_SPECIALIZATION (function))
556 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
557 /* Since this is a specialization of a member template,
558 we're not going to find the declaration in the class.
561 struct S { template <typename T> void f(T); };
562 template <> void S::f(int);
564 we're not going to find `S::f(int)', but there's no
565 reason we should, either. We let our callers know we didn't
566 find the method, but we don't complain. */
569 /* Basic sanity check: for a template function, the template parameters
570 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
571 if (TREE_CODE (function) == TEMPLATE_DECL)
573 gcc_assert (!template_parms
574 || comp_template_parms (template_parms,
575 DECL_TEMPLATE_PARMS (function)));
576 template_parms = DECL_TEMPLATE_PARMS (function);
579 /* OK, is this a definition of a member template? */
580 is_template = (template_parms != NULL_TREE);
582 /* We must enter the scope here, because conversion operators are
583 named by target type, and type equivalence relies on typenames
584 resolving within the scope of CTYPE. */
585 pushed_scope = push_scope (ctype);
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;
592 const char *format = NULL;
594 for (fndecls = VEC_index (tree, methods, ix);
595 fndecls; fndecls = OVL_NEXT (fndecls))
599 fndecl = OVL_CURRENT (fndecls);
600 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
601 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
603 /* We cannot simply call decls_match because this doesn't
604 work for static member functions that are pretending to
605 be methods, and because the name may have been changed by
608 /* Get rid of the this parameter on functions that become
610 if (DECL_STATIC_FUNCTION_P (fndecl)
611 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
612 p1 = TREE_CHAIN (p1);
614 /* A member template definition only matches a member template
616 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
619 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
620 TREE_TYPE (TREE_TYPE (fndecl)))
621 && compparms (p1, p2)
623 || comp_template_parms (template_parms,
624 DECL_TEMPLATE_PARMS (fndecl)))
625 && (DECL_TEMPLATE_SPECIALIZATION (function)
626 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
627 && (!DECL_TEMPLATE_SPECIALIZATION (function)
628 || (DECL_TI_TEMPLATE (function)
629 == DECL_TI_TEMPLATE (fndecl))))
635 pop_scope (pushed_scope);
636 return OVL_CURRENT (fndecls);
639 error ("prototype for %q#D does not match any in class %qT",
641 is_conv_op = DECL_CONV_FN_P (fndecl);
644 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
645 fndecls = VEC_index (tree, methods, ix);
648 fndecl = OVL_CURRENT (fndecls);
649 fndecls = OVL_NEXT (fndecls);
651 if (!fndecls && is_conv_op)
653 if (VEC_length (tree, methods) > (size_t) ++ix)
655 fndecls = VEC_index (tree, methods, ix);
656 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
668 format = N_("candidates are: %+#D");
670 format = N_("candidate is: %+#D");
671 error (format, fndecl);
674 else if (!COMPLETE_TYPE_P (ctype))
675 cxx_incomplete_type_error (function, ctype);
677 error ("no %q#D member function declared in class %qT",
680 /* If we did not find the method in the class, add it to avoid
681 spurious errors (unless the CTYPE is not yet defined, in which
682 case we'll only confuse ourselves when the function is declared
683 properly within the class. */
684 if (COMPLETE_TYPE_P (ctype))
685 add_method (ctype, function, NULL_TREE);
688 pop_scope (pushed_scope);
692 /* DECL is a function with vague linkage. Remember it so that at the
693 end of the translation unit we can decide whether or not to emit
697 note_vague_linkage_fn (tree decl)
699 if (!DECL_DEFERRED_FN (decl))
701 DECL_DEFERRED_FN (decl) = 1;
702 DECL_DEFER_OUTPUT (decl) = 1;
703 VEC_safe_push (tree, gc, deferred_fns, decl);
707 /* We have just processed the DECL, which is a static data member.
708 The other parameters are as for cp_finish_decl. */
711 finish_static_data_member_decl (tree decl,
712 tree init, bool init_const_expr_p,
716 DECL_CONTEXT (decl) = current_class_type;
718 /* We cannot call pushdecl here, because that would fill in the
719 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
720 the right thing, namely, to put this decl out straight away. */
722 if (! processing_template_decl)
723 VEC_safe_push (tree, gc, pending_statics, decl);
725 if (LOCAL_CLASS_P (current_class_type))
726 pedwarn ("local class %q#T shall not have static data member %q#D",
727 current_class_type, decl);
729 /* Static consts need not be initialized in the class definition. */
730 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
732 static int explained = 0;
734 error ("initializer invalid for static member with constructor");
737 error ("(an out of class initialization is required)");
742 /* Force the compiler to know when an uninitialized static const
743 member is being used. */
744 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
745 TREE_USED (decl) = 1;
746 DECL_INITIAL (decl) = init;
747 DECL_IN_AGGR_P (decl) = 1;
749 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
752 /* DECLARATOR and DECLSPECS correspond to a class member. The other
753 parameters are as for cp_finish_decl. Return the DECL for the
754 class member declared. */
757 grokfield (const cp_declarator *declarator,
758 cp_decl_specifier_seq *declspecs,
759 tree init, bool init_const_expr_p,
764 const char *asmspec = 0;
765 int flags = LOOKUP_ONLYCONVERTING;
768 && TREE_CODE (init) == TREE_LIST
769 && TREE_VALUE (init) == error_mark_node
770 && TREE_CHAIN (init) == NULL_TREE)
773 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
774 if (! value || error_operand_p (value))
775 /* friend or constructor went bad. */
776 return error_mark_node;
778 if (TREE_CODE (value) == TYPE_DECL && init)
780 error ("typedef %qD is initialized (use __typeof__ instead)", value);
784 /* Pass friendly classes back. */
785 if (value == void_type_node)
788 /* Pass friend decls back. */
789 if ((TREE_CODE (value) == FUNCTION_DECL
790 || TREE_CODE (value) == TEMPLATE_DECL)
791 && DECL_CONTEXT (value) != current_class_type)
794 if (DECL_NAME (value) != NULL_TREE
795 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
796 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
797 error ("member %qD conflicts with virtual function table field name",
800 /* Stash away type declarations. */
801 if (TREE_CODE (value) == TYPE_DECL)
803 DECL_NONLOCAL (value) = 1;
804 DECL_CONTEXT (value) = current_class_type;
806 if (processing_template_decl)
807 value = push_template_decl (value);
811 /* Avoid storing attributes in template parameters:
812 tsubst is not ready to handle them. */
813 tree type = TREE_TYPE (value);
814 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
815 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
816 sorry ("applying attributes to template parameters is not implemented");
818 cplus_decl_attributes (&value, attrlist, 0);
824 if (DECL_IN_AGGR_P (value))
826 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
827 return void_type_node;
830 if (asmspec_tree && asmspec_tree != error_mark_node)
831 asmspec = TREE_STRING_POINTER (asmspec_tree);
835 if (TREE_CODE (value) == FUNCTION_DECL)
837 /* Initializers for functions are rejected early in the parser.
838 If we get here, it must be a pure specifier for a method. */
839 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
841 gcc_assert (error_operand_p (init) || integer_zerop (init));
842 DECL_PURE_VIRTUAL_P (value) = 1;
846 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
847 error ("initializer specified for static member function %qD",
851 else if (pedantic && TREE_CODE (value) != VAR_DECL)
852 /* Already complained in grokdeclarator. */
854 else if (!processing_template_decl)
856 if (TREE_CODE (init) == CONSTRUCTOR)
857 init = digest_init (TREE_TYPE (value), init);
859 init = integral_constant_value (init);
861 if (init != error_mark_node && !TREE_CONSTANT (init))
863 /* We can allow references to things that are effectively
864 static, since references are initialized with the
866 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
867 || (TREE_STATIC (init) == 0
868 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
870 error ("field initializer is not constant");
871 init = error_mark_node;
877 if (processing_template_decl
878 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
880 value = push_template_decl (value);
881 if (error_operand_p (value))
882 return error_mark_node;
886 cplus_decl_attributes (&value, attrlist, 0);
888 switch (TREE_CODE (value))
891 finish_static_data_member_decl (value, init, init_const_expr_p,
892 asmspec_tree, flags);
897 error ("%<asm%> specifiers are not permitted on non-static data members");
898 if (DECL_INITIAL (value) == error_mark_node)
899 init = error_mark_node;
900 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
902 DECL_INITIAL (value) = init;
903 DECL_IN_AGGR_P (value) = 1;
908 set_user_assembler_name (value, asmspec);
910 cp_finish_decl (value,
912 /*init_const_expr_p=*/false,
913 asmspec_tree, flags);
915 /* Pass friends back this way. */
916 if (DECL_FRIEND_P (value))
917 return void_type_node;
919 DECL_IN_AGGR_P (value) = 1;
928 /* Like `grokfield', but for bitfields.
929 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
932 grokbitfield (const cp_declarator *declarator,
933 cp_decl_specifier_seq *declspecs, tree width)
935 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
937 if (value == error_mark_node)
938 return NULL_TREE; /* friends went bad. */
940 /* Pass friendly classes back. */
941 if (TREE_CODE (value) == VOID_TYPE)
942 return void_type_node;
944 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
945 && (POINTER_TYPE_P (value)
946 || !dependent_type_p (TREE_TYPE (value))))
948 error ("bit-field %qD with non-integral type", value);
949 return error_mark_node;
952 if (TREE_CODE (value) == TYPE_DECL)
954 error ("cannot declare %qD to be a bit-field type", value);
958 /* Usually, finish_struct_1 catches bitfields with invalid types.
959 But, in the case of bitfields with function type, we confuse
960 ourselves into thinking they are member functions, so we must
962 if (TREE_CODE (value) == FUNCTION_DECL)
964 error ("cannot declare bit-field %qD with function type",
969 if (DECL_IN_AGGR_P (value))
971 error ("%qD is already defined in the class %qT", value,
972 DECL_CONTEXT (value));
973 return void_type_node;
976 if (TREE_STATIC (value))
978 error ("static member %qD cannot be a bit-field", value);
981 finish_decl (value, NULL_TREE, NULL_TREE);
983 if (width != error_mark_node)
985 constant_expression_warning (width);
986 DECL_INITIAL (value) = width;
987 SET_DECL_C_BIT_FIELD (value);
990 DECL_IN_AGGR_P (value) = 1;
996 cplus_decl_attributes (tree *decl, tree attributes, int flags)
998 if (*decl == NULL_TREE || *decl == void_type_node
999 || *decl == error_mark_node)
1002 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1003 decl = &DECL_TEMPLATE_RESULT (*decl);
1005 decl_attributes (decl, attributes, flags);
1007 if (TREE_CODE (*decl) == TYPE_DECL)
1008 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1011 /* Walks through the namespace- or function-scope anonymous union
1012 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1013 Returns one of the fields for use in the mangled name. */
1016 build_anon_union_vars (tree type, tree object)
1018 tree main_decl = NULL_TREE;
1021 /* Rather than write the code to handle the non-union case,
1022 just give an error. */
1023 if (TREE_CODE (type) != UNION_TYPE)
1024 error ("anonymous struct not inside named type");
1026 for (field = TYPE_FIELDS (type);
1028 field = TREE_CHAIN (field))
1033 if (DECL_ARTIFICIAL (field))
1035 if (TREE_CODE (field) != FIELD_DECL)
1037 pedwarn ("%q+#D invalid; an anonymous union can only "
1038 "have non-static data members", field);
1042 if (TREE_PRIVATE (field))
1043 pedwarn ("private member %q+#D in anonymous union", field);
1044 else if (TREE_PROTECTED (field))
1045 pedwarn ("protected member %q+#D in anonymous union", field);
1047 if (processing_template_decl)
1048 ref = build_min_nt (COMPONENT_REF, object,
1049 DECL_NAME (field), NULL_TREE);
1051 ref = build_class_member_access_expr (object, field, NULL_TREE,
1054 if (DECL_NAME (field))
1058 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1059 DECL_ANON_UNION_VAR_P (decl) = 1;
1061 base = get_base_address (object);
1062 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1063 TREE_STATIC (decl) = TREE_STATIC (base);
1064 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1066 SET_DECL_VALUE_EXPR (decl, ref);
1067 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1069 decl = pushdecl (decl);
1071 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1072 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1076 if (main_decl == NULL_TREE)
1083 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1084 anonymous union, then all members must be laid out together. PUBLIC_P
1085 is nonzero if this union is not declared static. */
1088 finish_anon_union (tree anon_union_decl)
1094 if (anon_union_decl == error_mark_node)
1097 type = TREE_TYPE (anon_union_decl);
1098 public_p = TREE_PUBLIC (anon_union_decl);
1100 /* The VAR_DECL's context is the same as the TYPE's context. */
1101 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1103 if (TYPE_FIELDS (type) == NULL_TREE)
1108 error ("namespace-scope anonymous aggregates must be static");
1112 main_decl = build_anon_union_vars (type, anon_union_decl);
1113 if (main_decl == error_mark_node)
1115 if (main_decl == NULL_TREE)
1117 warning (0, "anonymous union with no members");
1121 if (!processing_template_decl)
1123 /* Use main_decl to set the mangled name. */
1124 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1125 mangle_decl (anon_union_decl);
1126 DECL_NAME (anon_union_decl) = NULL_TREE;
1129 pushdecl (anon_union_decl);
1130 if (building_stmt_tree ()
1131 && at_function_scope_p ())
1132 add_decl_expr (anon_union_decl);
1133 else if (!processing_template_decl)
1134 rest_of_decl_compilation (anon_union_decl,
1135 toplevel_bindings_p (), at_eof);
1138 /* Auxiliary functions to make type signatures for
1139 `operator new' and `operator delete' correspond to
1140 what compiler will be expecting. */
1143 coerce_new_type (tree type)
1146 tree args = TYPE_ARG_TYPES (type);
1148 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1150 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1153 error ("%<operator new%> must return type %qT", ptr_type_node);
1156 if (!args || args == void_list_node
1157 || !same_type_p (TREE_VALUE (args), size_type_node))
1160 if (args && args != void_list_node)
1161 args = TREE_CHAIN (args);
1162 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1163 "as first parameter", size_type_node);
1168 args = tree_cons (NULL_TREE, size_type_node, args);
1171 type = build_exception_variant
1172 (build_function_type (ptr_type_node, args),
1173 TYPE_RAISES_EXCEPTIONS (type));
1181 coerce_delete_type (tree type)
1184 tree args = TYPE_ARG_TYPES (type);
1186 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1188 if (!same_type_p (TREE_TYPE (type), void_type_node))
1191 error ("%<operator delete%> must return type %qT", void_type_node);
1194 if (!args || args == void_list_node
1195 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1198 if (args && args != void_list_node)
1199 args = TREE_CHAIN (args);
1200 error ("%<operator delete%> takes type %qT as first parameter",
1206 args = tree_cons (NULL_TREE, ptr_type_node, args);
1209 type = build_exception_variant
1210 (build_function_type (void_type_node, args),
1211 TYPE_RAISES_EXCEPTIONS (type));
1220 mark_vtable_entries (tree decl)
1223 unsigned HOST_WIDE_INT idx;
1225 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1230 STRIP_NOPS (fnaddr);
1232 if (TREE_CODE (fnaddr) != ADDR_EXPR
1233 && TREE_CODE (fnaddr) != FDESC_EXPR)
1234 /* This entry is an offset: a virtual base class offset, a
1235 virtual call offset, an RTTI offset, etc. */
1238 fn = TREE_OPERAND (fnaddr, 0);
1239 TREE_ADDRESSABLE (fn) = 1;
1240 /* When we don't have vcall offsets, we output thunks whenever
1241 we output the vtables that contain them. With vcall offsets,
1242 we know all the thunks we'll need when we emit a virtual
1243 function, so we emit the thunks there instead. */
1244 if (DECL_THUNK_P (fn))
1245 use_thunk (fn, /*emit_p=*/0);
1250 /* Set DECL up to have the closest approximation of "initialized common"
1251 linkage available. */
1254 comdat_linkage (tree decl)
1257 make_decl_one_only (decl);
1258 else if (TREE_CODE (decl) == FUNCTION_DECL
1259 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1260 /* We can just emit function and compiler-generated variables
1261 statically; having multiple copies is (for the most part) only
1264 There are two correctness issues, however: the address of a
1265 template instantiation with external linkage should be the
1266 same, independent of what translation unit asks for the
1267 address, and this will not hold when we emit multiple copies of
1268 the function. However, there's little else we can do.
1270 Also, by default, the typeinfo implementation assumes that
1271 there will be only one copy of the string used as the name for
1272 each type. Therefore, if weak symbols are unavailable, the
1273 run-time library should perform a more conservative check; it
1274 should perform a string comparison, rather than an address
1276 TREE_PUBLIC (decl) = 0;
1279 /* Static data member template instantiations, however, cannot
1280 have multiple copies. */
1281 if (DECL_INITIAL (decl) == 0
1282 || DECL_INITIAL (decl) == error_mark_node)
1283 DECL_COMMON (decl) = 1;
1284 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1286 DECL_COMMON (decl) = 1;
1287 DECL_INITIAL (decl) = error_mark_node;
1289 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1291 /* We can't do anything useful; leave vars for explicit
1293 DECL_EXTERNAL (decl) = 1;
1294 DECL_NOT_REALLY_EXTERN (decl) = 0;
1298 if (DECL_LANG_SPECIFIC (decl))
1299 DECL_COMDAT (decl) = 1;
1302 /* For win32 we also want to put explicit instantiations in
1303 linkonce sections, so that they will be merged with implicit
1304 instantiations; otherwise we get duplicate symbol errors.
1305 For Darwin we do not want explicit instantiations to be
1309 maybe_make_one_only (tree decl)
1311 /* We used to say that this was not necessary on targets that support weak
1312 symbols, because the implicit instantiations will defer to the explicit
1313 one. However, that's not actually the case in SVR4; a strong definition
1314 after a weak one is an error. Also, not making explicit
1315 instantiations one_only means that we can end up with two copies of
1316 some template instantiations. */
1320 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1321 we can get away with not emitting them if they aren't used. We need
1322 to for variables so that cp_finish_decl will update their linkage,
1323 because their DECL_INITIAL may not have been set properly yet. */
1325 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1326 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1327 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1329 make_decl_one_only (decl);
1331 if (TREE_CODE (decl) == VAR_DECL)
1333 DECL_COMDAT (decl) = 1;
1334 /* Mark it needed so we don't forget to emit it. */
1335 mark_decl_referenced (decl);
1340 /* Determine whether or not we want to specifically import or export CTYPE,
1341 using various heuristics. */
1344 import_export_class (tree ctype)
1346 /* -1 for imported, 1 for exported. */
1347 int import_export = 0;
1349 /* It only makes sense to call this function at EOF. The reason is
1350 that this function looks at whether or not the first non-inline
1351 non-abstract virtual member function has been defined in this
1352 translation unit. But, we can't possibly know that until we've
1353 seen the entire translation unit. */
1354 gcc_assert (at_eof);
1356 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1359 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1360 we will have CLASSTYPE_INTERFACE_ONLY set but not
1361 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1362 heuristic because someone will supply a #pragma implementation
1363 elsewhere, and deducing it here would produce a conflict. */
1364 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1367 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1369 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1371 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1372 && !flag_implicit_templates)
1373 /* For a template class, without -fimplicit-templates, check the
1374 repository. If the virtual table is assigned to this
1375 translation unit, then export the class; otherwise, import
1377 import_export = repo_export_class_p (ctype) ? 1 : -1;
1378 else if (TYPE_POLYMORPHIC_P (ctype))
1380 /* The ABI specifies that the virtual table and associated
1381 information are emitted with the key method, if any. */
1382 tree method = CLASSTYPE_KEY_METHOD (ctype);
1383 /* If weak symbol support is not available, then we must be
1384 careful not to emit the vtable when the key function is
1385 inline. An inline function can be defined in multiple
1386 translation units. If we were to emit the vtable in each
1387 translation unit containing a definition, we would get
1388 multiple definition errors at link-time. */
1389 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1390 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1393 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1394 a definition anywhere else. */
1395 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1398 /* Allow backends the chance to overrule the decision. */
1399 if (targetm.cxx.import_export_class)
1400 import_export = targetm.cxx.import_export_class (ctype, import_export);
1404 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1405 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1409 /* Return true if VAR has already been provided to the back end; in that
1410 case VAR should not be modified further by the front end. */
1412 var_finalized_p (tree var)
1414 return cgraph_varpool_node (var)->finalized;
1417 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1418 must be emitted in this translation unit. Mark it as such. */
1421 mark_needed (tree decl)
1423 /* It's possible that we no longer need to set
1424 TREE_SYMBOL_REFERENCED here directly, but doing so is
1426 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1427 mark_decl_referenced (decl);
1430 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1431 returns true if a definition of this entity should be provided in
1432 this object file. Callers use this function to determine whether
1433 or not to let the back end know that a definition of DECL is
1434 available in this translation unit. */
1437 decl_needed_p (tree decl)
1439 gcc_assert (TREE_CODE (decl) == VAR_DECL
1440 || TREE_CODE (decl) == FUNCTION_DECL);
1441 /* This function should only be called at the end of the translation
1442 unit. We cannot be sure of whether or not something will be
1443 COMDAT until that point. */
1444 gcc_assert (at_eof);
1446 /* All entities with external linkage that are not COMDAT should be
1447 emitted; they may be referred to from other object files. */
1448 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1450 /* If this entity was used, let the back-end see it; it will decide
1451 whether or not to emit it into the object file. */
1452 if (TREE_USED (decl)
1453 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1454 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1456 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1457 reference to DECL might cause it to be emitted later. */
1461 /* If necessary, write out the vtables for the dynamic class CTYPE.
1462 Returns true if any vtables were emitted. */
1465 maybe_emit_vtables (tree ctype)
1471 /* If the vtables for this class have already been emitted there is
1472 nothing more to do. */
1473 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1474 if (var_finalized_p (primary_vtbl))
1476 /* Ignore dummy vtables made by get_vtable_decl. */
1477 if (TREE_TYPE (primary_vtbl) == void_type_node)
1480 /* On some targets, we cannot determine the key method until the end
1481 of the translation unit -- which is when this function is
1483 if (!targetm.cxx.key_method_may_be_inline ())
1484 determine_key_method (ctype);
1486 /* See if any of the vtables are needed. */
1487 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1489 import_export_decl (vtbl);
1490 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1495 /* If the references to this class' vtables are optimized away,
1496 still emit the appropriate debugging information. See
1498 if (DECL_COMDAT (primary_vtbl)
1499 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1500 note_debug_info_needed (ctype);
1504 /* The ABI requires that we emit all of the vtables if we emit any
1506 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1508 /* Mark entities references from the virtual table as used. */
1509 mark_vtable_entries (vtbl);
1511 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1513 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1515 /* It had better be all done at compile-time. */
1520 DECL_EXTERNAL (vtbl) = 0;
1521 rest_of_decl_compilation (vtbl, 1, 1);
1523 /* Because we're only doing syntax-checking, we'll never end up
1524 actually marking the variable as written. */
1525 if (flag_syntax_only)
1526 TREE_ASM_WRITTEN (vtbl) = 1;
1529 /* Since we're writing out the vtable here, also write the debug
1531 note_debug_info_needed (ctype);
1536 /* A special return value from type_visibility meaning internal
1539 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1541 /* walk_tree helper function for type_visibility. */
1544 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1546 int *vis_p = (int *)data;
1551 else if (CLASS_TYPE_P (*tp))
1553 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1555 *vis_p = VISIBILITY_ANON;
1558 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1559 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1564 /* Returns the visibility of TYPE, which is the minimum visibility of its
1568 type_visibility (tree type)
1570 int vis = VISIBILITY_DEFAULT;
1571 walk_tree_without_duplicates (&type, min_vis_r, &vis);
1575 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1576 specified (or if VISIBILITY is static). */
1579 constrain_visibility (tree decl, int visibility)
1581 if (visibility == VISIBILITY_ANON)
1583 /* extern "C" declarations aren't affected by the anonymous
1585 if (!DECL_EXTERN_C_P (decl))
1587 TREE_PUBLIC (decl) = 0;
1588 DECL_INTERFACE_KNOWN (decl) = 1;
1589 if (DECL_LANG_SPECIFIC (decl))
1590 DECL_NOT_REALLY_EXTERN (decl) = 1;
1593 else if (visibility > DECL_VISIBILITY (decl)
1594 && !DECL_VISIBILITY_SPECIFIED (decl))
1596 DECL_VISIBILITY (decl) = visibility;
1602 /* Constrain the visibility of DECL based on the visibility of its template
1606 constrain_visibility_for_template (tree decl, tree targs)
1608 /* If this is a template instantiation, check the innermost
1609 template args for visibility constraints. The outer template
1610 args are covered by the class check. */
1611 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1613 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1617 tree arg = TREE_VEC_ELT (args, i-1);
1619 vis = type_visibility (arg);
1620 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1623 if (TREE_CODE (arg) == ADDR_EXPR)
1624 arg = TREE_OPERAND (arg, 0);
1625 if (TREE_CODE (arg) == VAR_DECL
1626 || TREE_CODE (arg) == FUNCTION_DECL)
1628 if (! TREE_PUBLIC (arg))
1629 vis = VISIBILITY_ANON;
1631 vis = DECL_VISIBILITY (arg);
1635 constrain_visibility (decl, vis);
1639 /* Like c_determine_visibility, but with additional C++-specific
1642 Function-scope entities can rely on the function's visibility because
1643 it is set in start_preparsed_function.
1645 Class-scope entities cannot rely on the class's visibility until the end
1646 of the enclosing class definition.
1648 Note that because namespaces have multiple independent definitions,
1649 namespace visibility is handled elsewhere using the #pragma visibility
1650 machinery rather than by decorating the namespace declaration.
1652 The goal is for constraints from the type to give a diagnostic, and
1653 other constraints to be applied silently. */
1656 determine_visibility (tree decl)
1658 tree class_type = NULL_TREE;
1661 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1663 /* Only relevant for names with external linkage. */
1664 if (!TREE_PUBLIC (decl))
1667 /* Cloned constructors and destructors get the same visibility as
1668 the underlying function. That should be set up in
1669 maybe_clone_body. */
1670 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1672 if (TREE_CODE (decl) == TYPE_DECL)
1674 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1675 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1676 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1681 else if (DECL_LANG_SPECIFIC (decl))
1682 use_template = DECL_USE_TEMPLATE (decl);
1686 /* Anything that is exported must have default visibility. */
1687 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1688 && lookup_attribute ("dllexport",
1689 TREE_CODE (decl) == TYPE_DECL
1690 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
1691 : DECL_ATTRIBUTES (decl)))
1693 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1694 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1697 /* If DECL is a member of a class, visibility specifiers on the
1698 class can influence the visibility of the DECL. */
1699 if (DECL_CLASS_SCOPE_P (decl))
1700 class_type = DECL_CONTEXT (decl);
1703 /* Not a class member. */
1705 /* Virtual tables have DECL_CONTEXT set to their associated class,
1706 so they are automatically handled above. */
1707 gcc_assert (TREE_CODE (decl) != VAR_DECL
1708 || !DECL_VTABLE_OR_VTT_P (decl));
1710 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1712 /* Local statics and classes get the visibility of their
1713 containing function by default, except that
1714 -fvisibility-inlines-hidden doesn't affect them. */
1715 tree fn = DECL_CONTEXT (decl);
1716 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1718 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1719 DECL_VISIBILITY_SPECIFIED (decl) =
1720 DECL_VISIBILITY_SPECIFIED (fn);
1723 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1725 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1726 but have no TEMPLATE_INFO, so don't try to check it. */
1729 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1730 && flag_visibility_ms_compat)
1732 /* Under -fvisibility-ms-compat, types are visible by default,
1733 even though their contents aren't. */
1734 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1735 int underlying_vis = type_visibility (underlying_type);
1736 if (underlying_vis == VISIBILITY_ANON
1737 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1738 constrain_visibility (decl, underlying_vis);
1740 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1742 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1744 /* tinfo visibility is based on the type it's for. */
1745 constrain_visibility
1746 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1748 else if (use_template)
1749 /* Template instantiations and specializations get visibility based
1750 on their template unless they override it with an attribute. */;
1751 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1753 /* Set default visibility to whatever the user supplied with
1754 #pragma GCC visibility or a namespace visibility attribute. */
1755 DECL_VISIBILITY (decl) = default_visibility;
1756 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1762 /* If the specialization doesn't specify visibility, use the
1763 visibility from the template. */
1764 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1765 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1766 : DECL_TEMPLATE_INFO (decl));
1767 tree args = TI_ARGS (tinfo);
1769 if (args != error_mark_node)
1771 int depth = TMPL_ARGS_DEPTH (args);
1772 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1774 if (!DECL_VISIBILITY_SPECIFIED (decl))
1776 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1777 DECL_VISIBILITY_SPECIFIED (decl)
1778 = DECL_VISIBILITY_SPECIFIED (pattern);
1781 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1782 if (args && depth > template_class_depth (class_type))
1783 /* Limit visibility based on its template arguments. */
1784 constrain_visibility_for_template (decl, args);
1789 determine_visibility_from_class (decl, class_type);
1791 if (decl_anon_ns_mem_p (decl))
1792 /* Names in an anonymous namespace get internal linkage.
1793 This might change once we implement export. */
1794 constrain_visibility (decl, VISIBILITY_ANON);
1795 else if (TREE_CODE (decl) != TYPE_DECL)
1797 /* Propagate anonymity from type to decl. */
1798 int tvis = type_visibility (TREE_TYPE (decl));
1799 if (tvis == VISIBILITY_ANON
1800 || ! DECL_VISIBILITY_SPECIFIED (decl))
1801 constrain_visibility (decl, tvis);
1805 /* By default, static data members and function members receive
1806 the visibility of their containing class. */
1809 determine_visibility_from_class (tree decl, tree class_type)
1811 if (visibility_options.inlines_hidden
1812 /* Don't do this for inline templates; specializations might not be
1813 inline, and we don't want them to inherit the hidden
1814 visibility. We'll set it here for all inline instantiations. */
1815 && !processing_template_decl
1816 && ! DECL_VISIBILITY_SPECIFIED (decl)
1817 && TREE_CODE (decl) == FUNCTION_DECL
1818 && DECL_DECLARED_INLINE_P (decl)
1819 && (! DECL_LANG_SPECIFIC (decl)
1820 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1821 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1822 else if (!DECL_VISIBILITY_SPECIFIED (decl))
1824 /* Default to the class visibility. */
1825 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1826 DECL_VISIBILITY_SPECIFIED (decl)
1827 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1830 /* Give the target a chance to override the visibility associated
1832 if (TREE_CODE (decl) == VAR_DECL
1833 && (DECL_TINFO_P (decl)
1834 || (DECL_VTABLE_OR_VTT_P (decl)
1835 /* Construction virtual tables are not exported because
1836 they cannot be referred to from other object files;
1837 their name is not standardized by the ABI. */
1838 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1839 && TREE_PUBLIC (decl)
1840 && !DECL_REALLY_EXTERN (decl)
1841 && !DECL_VISIBILITY_SPECIFIED (decl)
1842 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1843 targetm.cxx.determine_class_data_visibility (decl);
1846 /* Constrain the visibility of a class TYPE based on the visibility of its
1847 field types. Warn if any fields require lesser visibility. */
1850 constrain_class_visibility (tree type)
1856 int vis = type_visibility (type);
1858 if (vis == VISIBILITY_ANON
1859 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
1862 /* Don't warn about visibility if the class has explicit visibility. */
1863 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
1864 vis = VISIBILITY_INTERNAL;
1866 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1867 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
1869 tree ftype = strip_array_types (TREE_TYPE (t));
1870 int subvis = type_visibility (ftype);
1872 if (subvis == VISIBILITY_ANON)
1874 if (!in_main_input_context ())
1876 %qT has a field %qD whose type uses the anonymous namespace",
1879 else if (IS_AGGR_TYPE (ftype)
1880 && vis < VISIBILITY_HIDDEN
1881 && subvis >= VISIBILITY_HIDDEN)
1882 warning (OPT_Wattributes, "\
1883 %qT declared with greater visibility than the type of its field %qD",
1887 binfo = TYPE_BINFO (type);
1888 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1890 int subvis = type_visibility (TREE_TYPE (t));
1892 if (subvis == VISIBILITY_ANON)
1894 if (!in_main_input_context())
1896 %qT has a base %qT whose type uses the anonymous namespace",
1897 type, TREE_TYPE (t));
1899 else if (vis < VISIBILITY_HIDDEN
1900 && subvis >= VISIBILITY_HIDDEN)
1901 warning (OPT_Wattributes, "\
1902 %qT declared with greater visibility than its base %qT",
1903 type, TREE_TYPE (t));
1907 /* APPLE LOCAL begin weak types 5954418 */
1909 typeinfo_comdat (tree type)
1911 tree binfo, base_binfo;
1914 if (lookup_attribute ("weak", TYPE_ATTRIBUTES (type)))
1917 for (binfo = TYPE_BINFO (type), j = 0;
1918 BINFO_BASE_ITERATE (binfo, j, base_binfo); ++j)
1920 if (typeinfo_comdat (BINFO_TYPE (base_binfo)))
1926 /* APPLE LOCAL end weak types 5954418 */
1928 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1929 for DECL has not already been determined, do so now by setting
1930 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1931 function is called entities with vague linkage whose definitions
1932 are available must have TREE_PUBLIC set.
1934 If this function decides to place DECL in COMDAT, it will set
1935 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1936 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1937 callers defer that decision until it is clear that DECL is actually
1941 import_export_decl (tree decl)
1946 tree class_type = NULL_TREE;
1948 if (DECL_INTERFACE_KNOWN (decl))
1951 /* We cannot determine what linkage to give to an entity with vague
1952 linkage until the end of the file. For example, a virtual table
1953 for a class will be defined if and only if the key method is
1954 defined in this translation unit. As a further example, consider
1955 that when compiling a translation unit that uses PCH file with
1956 "-frepo" it would be incorrect to make decisions about what
1957 entities to emit when building the PCH; those decisions must be
1958 delayed until the repository information has been processed. */
1959 gcc_assert (at_eof);
1960 /* Object file linkage for explicit instantiations is handled in
1961 mark_decl_instantiated. For static variables in functions with
1962 vague linkage, maybe_commonize_var is used.
1964 Therefore, the only declarations that should be provided to this
1965 function are those with external linkage that are:
1967 * implicit instantiations of function templates
1971 * implicit instantiations of static data members of class
1978 Furthermore, all entities that reach this point must have a
1979 definition available in this translation unit.
1981 The following assertions check these conditions. */
1982 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1983 || TREE_CODE (decl) == VAR_DECL);
1984 /* Any code that creates entities with TREE_PUBLIC cleared should
1985 also set DECL_INTERFACE_KNOWN. */
1986 gcc_assert (TREE_PUBLIC (decl));
1987 if (TREE_CODE (decl) == FUNCTION_DECL)
1988 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1989 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1990 || DECL_DECLARED_INLINE_P (decl));
1992 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1993 || DECL_VTABLE_OR_VTT_P (decl)
1994 || DECL_TINFO_P (decl));
1995 /* Check that a definition of DECL is available in this translation
1997 gcc_assert (!DECL_REALLY_EXTERN (decl));
1999 /* Assume that DECL will not have COMDAT linkage. */
2001 /* Assume that DECL will not be imported into this translation
2005 /* See if the repository tells us whether or not to emit DECL in
2006 this translation unit. */
2007 emit_p = repo_emit_p (decl);
2010 else if (emit_p == 1)
2012 /* The repository indicates that this entity should be defined
2013 here. Make sure the back end honors that request. */
2014 if (TREE_CODE (decl) == VAR_DECL)
2016 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2017 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2020 FOR_EACH_CLONE (clone, decl)
2021 mark_needed (clone);
2025 /* Output the definition as an ordinary strong definition. */
2026 DECL_EXTERNAL (decl) = 0;
2027 DECL_INTERFACE_KNOWN (decl) = 1;
2032 /* We have already decided what to do with this DECL; there is no
2033 need to check anything further. */
2035 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2037 class_type = DECL_CONTEXT (decl);
2038 import_export_class (class_type);
2039 if (TYPE_FOR_JAVA (class_type))
2041 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2042 && CLASSTYPE_INTERFACE_ONLY (class_type))
2044 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2045 && !CLASSTYPE_USE_TEMPLATE (class_type)
2046 && CLASSTYPE_KEY_METHOD (class_type)
2047 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2048 /* The ABI requires that all virtual tables be emitted with
2049 COMDAT linkage. However, on systems where COMDAT symbols
2050 don't show up in the table of contents for a static
2051 archive, or on systems without weak symbols (where we
2052 approximate COMDAT linkage by using internal linkage), the
2053 linker will report errors about undefined symbols because
2054 it will not see the virtual table definition. Therefore,
2055 in the case that we know that the virtual table will be
2056 emitted in only one translation unit, we make the virtual
2057 table an ordinary definition with external linkage. */
2058 DECL_EXTERNAL (decl) = 0;
2059 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2061 /* CLASS_TYPE is being exported from this translation unit,
2062 so DECL should be defined here. */
2063 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2064 /* If a class is declared in a header with the "extern
2065 template" extension, then it will not be instantiated,
2066 even in translation units that would normally require
2067 it. Often such classes are explicitly instantiated in
2068 one translation unit. Therefore, the explicit
2069 instantiation must be made visible to other translation
2071 DECL_EXTERNAL (decl) = 0;
2074 /* The generic C++ ABI says that class data is always
2075 COMDAT, even if there is a key function. Some
2076 variants (e.g., the ARM EABI) says that class data
2077 only has COMDAT linkage if the class data might be
2078 emitted in more than one translation unit. When the
2079 key method can be inline and is inline, we still have
2080 to arrange for comdat even though
2081 class_data_always_comdat is false. */
2082 if (!CLASSTYPE_KEY_METHOD (class_type)
2083 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2084 || targetm.cxx.class_data_always_comdat ())
2086 /* The ABI requires COMDAT linkage. Normally, we
2087 only emit COMDAT things when they are needed;
2088 make sure that we realize that this entity is
2095 else if (!flag_implicit_templates
2096 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2101 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2103 tree type = TREE_TYPE (DECL_NAME (decl));
2104 if (CLASS_TYPE_P (type))
2107 import_export_class (type);
2108 if (CLASSTYPE_INTERFACE_KNOWN (type)
2109 && TYPE_POLYMORPHIC_P (type)
2110 && CLASSTYPE_INTERFACE_ONLY (type)
2111 /* If -fno-rtti was specified, then we cannot be sure
2112 that RTTI information will be emitted with the
2113 virtual table of the class, so we must emit it
2114 wherever it is used. */
2119 if (CLASSTYPE_INTERFACE_KNOWN (type)
2120 && !CLASSTYPE_INTERFACE_ONLY (type))
2122 comdat_p = (targetm.cxx.class_data_always_comdat ()
2123 || (CLASSTYPE_KEY_METHOD (type)
2124 /* APPLE LOCAL begin weak types 5954418 */
2125 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type)))
2126 || typeinfo_comdat (type));
2127 /* APPLE LOCAL end weak types 5954418 */
2132 DECL_EXTERNAL (decl) = 0;
2142 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2143 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2145 /* DECL is an implicit instantiation of a function or static
2147 if (flag_implicit_templates
2148 || (flag_implicit_inline_templates
2149 && TREE_CODE (decl) == FUNCTION_DECL
2150 && DECL_DECLARED_INLINE_P (decl)))
2153 /* If we are not implicitly generating templates, then mark
2154 this entity as undefined in this translation unit. */
2157 else if (DECL_FUNCTION_MEMBER_P (decl))
2159 if (!DECL_DECLARED_INLINE_P (decl))
2161 tree ctype = DECL_CONTEXT (decl);
2162 import_export_class (ctype);
2163 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2165 DECL_NOT_REALLY_EXTERN (decl)
2166 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2167 || (DECL_DECLARED_INLINE_P (decl)
2168 && ! flag_implement_inlines
2169 && !DECL_VINDEX (decl)));
2171 if (!DECL_NOT_REALLY_EXTERN (decl))
2172 DECL_EXTERNAL (decl) = 1;
2174 /* Always make artificials weak. */
2175 if (DECL_ARTIFICIAL (decl) && flag_weak)
2178 maybe_make_one_only (decl);
2189 /* If we are importing DECL into this translation unit, mark is
2190 an undefined here. */
2191 DECL_EXTERNAL (decl) = 1;
2192 DECL_NOT_REALLY_EXTERN (decl) = 0;
2196 /* If we decided to put DECL in COMDAT, mark it accordingly at
2198 comdat_linkage (decl);
2201 DECL_INTERFACE_KNOWN (decl) = 1;
2204 /* Return an expression that performs the destruction of DECL, which
2205 must be a VAR_DECL whose type has a non-trivial destructor, or is
2206 an array whose (innermost) elements have a non-trivial destructor. */
2209 build_cleanup (tree decl)
2212 tree type = TREE_TYPE (decl);
2214 /* This function should only be called for declarations that really
2215 require cleanups. */
2216 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2218 /* Treat all objects with destructors as used; the destructor may do
2219 something substantive. */
2222 if (TREE_CODE (type) == ARRAY_TYPE)
2226 cxx_mark_addressable (decl);
2227 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
2229 temp = build_delete (TREE_TYPE (temp), temp,
2230 sfk_complete_destructor,
2231 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2235 /* Returns the initialization guard variable for the variable DECL,
2236 which has static storage duration. */
2239 get_guard (tree decl)
2244 sname = mangle_guard_variable (decl);
2245 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2250 /* We use a type that is big enough to contain a mutex as well
2251 as an integer counter. */
2252 guard_type = targetm.cxx.guard_type ();
2253 guard = build_decl (VAR_DECL, sname, guard_type);
2255 /* The guard should have the same linkage as what it guards. */
2256 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2257 TREE_STATIC (guard) = TREE_STATIC (decl);
2258 DECL_COMMON (guard) = DECL_COMMON (decl);
2259 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2260 if (TREE_PUBLIC (decl))
2261 DECL_WEAK (guard) = DECL_WEAK (decl);
2263 DECL_ARTIFICIAL (guard) = 1;
2264 DECL_IGNORED_P (guard) = 1;
2265 TREE_USED (guard) = 1;
2266 pushdecl_top_level_and_finish (guard, NULL_TREE);
2271 /* Return those bits of the GUARD variable that should be set when the
2272 guarded entity is actually initialized. */
2275 get_guard_bits (tree guard)
2277 if (!targetm.cxx.guard_mask_bit ())
2279 /* We only set the first byte of the guard, in order to leave room
2280 for a mutex in the high-order bits. */
2281 guard = build1 (ADDR_EXPR,
2282 build_pointer_type (TREE_TYPE (guard)),
2284 guard = build1 (NOP_EXPR,
2285 build_pointer_type (char_type_node),
2287 guard = build1 (INDIRECT_REF, char_type_node, guard);
2293 /* Return an expression which determines whether or not the GUARD
2294 variable has already been initialized. */
2297 get_guard_cond (tree guard)
2301 /* Check to see if the GUARD is zero. */
2302 guard = get_guard_bits (guard);
2304 /* Mask off all but the low bit. */
2305 if (targetm.cxx.guard_mask_bit ())
2307 guard_value = integer_one_node;
2308 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2309 guard_value = convert (TREE_TYPE (guard), guard_value);
2310 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2313 guard_value = integer_zero_node;
2314 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2315 guard_value = convert (TREE_TYPE (guard), guard_value);
2316 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2319 /* Return an expression which sets the GUARD variable, indicating that
2320 the variable being guarded has been initialized. */
2323 set_guard (tree guard)
2327 /* Set the GUARD to one. */
2328 guard = get_guard_bits (guard);
2329 guard_init = integer_one_node;
2330 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2331 guard_init = convert (TREE_TYPE (guard), guard_init);
2332 return build_modify_expr (guard, NOP_EXPR, guard_init);
2335 /* Start the process of running a particular set of global constructors
2336 or destructors. Subroutine of do_[cd]tors. */
2339 start_objects (int method_type, int initp)
2345 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2347 if (initp != DEFAULT_INIT_PRIORITY)
2357 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2360 sprintf (type, "%c", method_type);
2362 fndecl = build_lang_decl (FUNCTION_DECL,
2363 get_file_function_name (type),
2364 build_function_type (void_type_node,
2366 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2368 /* It can be a static function as long as collect2 does not have
2369 to scan the object file to find its ctor/dtor routine. */
2370 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2372 /* Mark as artificial because it's not explicitly in the user's
2374 DECL_ARTIFICIAL (current_function_decl) = 1;
2376 /* Mark this declaration as used to avoid spurious warnings. */
2377 TREE_USED (current_function_decl) = 1;
2379 /* Mark this function as a global constructor or destructor. */
2380 if (method_type == 'I')
2381 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2383 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2384 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2386 body = begin_compound_stmt (BCS_FN_BODY);
2388 /* We cannot allow these functions to be elided, even if they do not
2389 have external linkage. And, there's no point in deferring
2390 compilation of these functions; they're all going to have to be
2392 DECL_INLINE (current_function_decl) = 0;
2393 DECL_UNINLINABLE (current_function_decl) = 1;
2398 /* Finish the process of running a particular set of global constructors
2399 or destructors. Subroutine of do_[cd]tors. */
2402 finish_objects (int method_type, int initp, tree body)
2407 finish_compound_stmt (body);
2408 fn = finish_function (0);
2409 expand_or_defer_fn (fn);
2411 /* When only doing semantic analysis, and no RTL generation, we
2412 can't call functions that directly emit assembly code; there is
2413 no assembly file in which to put the code. */
2414 if (flag_syntax_only)
2417 if (targetm.have_ctors_dtors)
2419 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2420 cgraph_mark_needed_node (cgraph_node (fn));
2421 if (method_type == 'I')
2422 (* targetm.asm_out.constructor) (fnsym, initp);
2424 (* targetm.asm_out.destructor) (fnsym, initp);
2428 /* The names of the parameters to the function created to handle
2429 initializations and destructions for objects with static storage
2431 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2432 #define PRIORITY_IDENTIFIER "__priority"
2434 /* The name of the function we create to handle initializations and
2435 destructions for objects with static storage duration. */
2436 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2438 /* The declaration for the __INITIALIZE_P argument. */
2439 static GTY(()) tree initialize_p_decl;
2441 /* The declaration for the __PRIORITY argument. */
2442 static GTY(()) tree priority_decl;
2444 /* The declaration for the static storage duration function. */
2445 static GTY(()) tree ssdf_decl;
2447 /* All the static storage duration functions created in this
2448 translation unit. */
2449 static GTY(()) VEC(tree,gc) *ssdf_decls;
2451 /* A map from priority levels to information about that priority
2452 level. There may be many such levels, so efficient lookup is
2454 static splay_tree priority_info_map;
2456 /* Begins the generation of the function that will handle all
2457 initialization and destruction of objects with static storage
2458 duration. The function generated takes two parameters of type
2459 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2460 nonzero, it performs initializations. Otherwise, it performs
2461 destructions. It only performs those initializations or
2462 destructions with the indicated __PRIORITY. The generated function
2465 It is assumed that this function will only be called once per
2466 translation unit. */
2469 start_static_storage_duration_function (unsigned count)
2474 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2476 /* Create the identifier for this function. It will be of the form
2477 SSDF_IDENTIFIER_<number>. */
2478 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2480 /* Create the parameters. */
2481 parm_types = void_list_node;
2482 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2483 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2484 type = build_function_type (void_type_node, parm_types);
2486 /* Create the FUNCTION_DECL itself. */
2487 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2488 get_identifier (id),
2490 TREE_PUBLIC (ssdf_decl) = 0;
2491 DECL_ARTIFICIAL (ssdf_decl) = 1;
2493 /* Put this function in the list of functions to be called from the
2494 static constructors and destructors. */
2497 ssdf_decls = VEC_alloc (tree, gc, 32);
2499 /* Take this opportunity to initialize the map from priority
2500 numbers to information about that priority level. */
2501 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2502 /*delete_key_fn=*/0,
2503 /*delete_value_fn=*/
2504 (splay_tree_delete_value_fn) &free);
2506 /* We always need to generate functions for the
2507 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2508 priorities later, we'll be sure to find the
2509 DEFAULT_INIT_PRIORITY. */
2510 get_priority_info (DEFAULT_INIT_PRIORITY);
2513 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2515 /* Create the argument list. */
2516 initialize_p_decl = cp_build_parm_decl
2517 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2518 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2519 TREE_USED (initialize_p_decl) = 1;
2520 priority_decl = cp_build_parm_decl
2521 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2522 DECL_CONTEXT (priority_decl) = ssdf_decl;
2523 TREE_USED (priority_decl) = 1;
2525 TREE_CHAIN (initialize_p_decl) = priority_decl;
2526 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2528 /* Put the function in the global scope. */
2529 pushdecl (ssdf_decl);
2531 /* Start the function itself. This is equivalent to declaring the
2534 static void __ssdf (int __initialize_p, init __priority_p);
2536 It is static because we only need to call this function from the
2537 various constructor and destructor functions for this module. */
2538 start_preparsed_function (ssdf_decl,
2539 /*attrs=*/NULL_TREE,
2542 /* Set up the scope of the outermost block in the function. */
2543 body = begin_compound_stmt (BCS_FN_BODY);
2545 /* This function must not be deferred because we are depending on
2546 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2547 DECL_INLINE (ssdf_decl) = 0;
2548 DECL_UNINLINABLE (ssdf_decl) = 1;
2553 /* Finish the generation of the function which performs initialization
2554 and destruction of objects with static storage duration. After
2555 this point, no more such objects can be created. */
2558 finish_static_storage_duration_function (tree body)
2560 /* Close out the function. */
2561 finish_compound_stmt (body);
2562 expand_or_defer_fn (finish_function (0));
2565 /* Return the information about the indicated PRIORITY level. If no
2566 code to handle this level has yet been generated, generate the
2567 appropriate prologue. */
2569 static priority_info
2570 get_priority_info (int priority)
2575 n = splay_tree_lookup (priority_info_map,
2576 (splay_tree_key) priority);
2579 /* Create a new priority information structure, and insert it
2581 pi = XNEW (struct priority_info_s);
2582 pi->initializations_p = 0;
2583 pi->destructions_p = 0;
2584 splay_tree_insert (priority_info_map,
2585 (splay_tree_key) priority,
2586 (splay_tree_value) pi);
2589 pi = (priority_info) n->value;
2594 /* The effective initialization priority of a DECL. */
2596 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2597 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2598 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2600 /* Whether a DECL needs a guard to protect it against multiple
2603 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2604 || DECL_ONE_ONLY (decl) \
2605 || DECL_WEAK (decl)))
2607 /* Set up to handle the initialization or destruction of DECL. If
2608 INITP is nonzero, we are initializing the variable. Otherwise, we
2609 are destroying it. */
2612 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2614 tree guard_if_stmt = NULL_TREE;
2617 /* If we are supposed to destruct and there's a trivial destructor,
2618 nothing has to be done. */
2620 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2623 /* Trick the compiler into thinking we are at the file and line
2624 where DECL was declared so that error-messages make sense, and so
2625 that the debugger will show somewhat sensible file and line
2627 input_location = DECL_SOURCE_LOCATION (decl);
2633 Access control for implicit calls to the constructors,
2634 the conversion functions, or the destructor called to
2635 create and destroy a static data member is performed as
2636 if these calls appeared in the scope of the member's
2639 we pretend we are in a static member function of the class of
2640 which the DECL is a member. */
2641 if (member_p (decl))
2643 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2644 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2647 /* Assume we don't need a guard. */
2649 /* We need a guard if this is an object with external linkage that
2650 might be initialized in more than one place. (For example, a
2651 static data member of a template, when the data member requires
2653 if (NEEDS_GUARD_P (decl))
2657 guard = get_guard (decl);
2659 /* When using __cxa_atexit, we just check the GUARD as we would
2660 for a local static. */
2661 if (flag_use_cxa_atexit)
2663 /* When using __cxa_atexit, we never try to destroy
2664 anything from a static destructor. */
2666 guard_cond = get_guard_cond (guard);
2668 /* If we don't have __cxa_atexit, then we will be running
2669 destructors from .fini sections, or their equivalents. So,
2670 we need to know how many times we've tried to initialize this
2671 object. We do initializations only if the GUARD is zero,
2672 i.e., if we are the first to initialize the variable. We do
2673 destructions only if the GUARD is one, i.e., if we are the
2674 last to destroy the variable. */
2677 = cp_build_binary_op (EQ_EXPR,
2678 build_unary_op (PREINCREMENT_EXPR,
2684 = cp_build_binary_op (EQ_EXPR,
2685 build_unary_op (PREDECREMENT_EXPR,
2690 guard_if_stmt = begin_if_stmt ();
2691 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2695 /* If we're using __cxa_atexit, we have not already set the GUARD,
2696 so we must do so now. */
2697 if (guard && initp && flag_use_cxa_atexit)
2698 finish_expr_stmt (set_guard (guard));
2700 /* Perform the initialization or destruction. */
2704 finish_expr_stmt (init);
2706 /* If we're using __cxa_atexit, register a function that calls the
2707 destructor for the object. */
2708 if (flag_use_cxa_atexit)
2709 finish_expr_stmt (register_dtor_fn (decl));
2712 finish_expr_stmt (build_cleanup (decl));
2714 /* Finish the guard if-stmt, if necessary. */
2717 finish_then_clause (guard_if_stmt);
2718 finish_if_stmt (guard_if_stmt);
2721 /* Now that we're done with DECL we don't need to pretend to be a
2722 member of its class any longer. */
2723 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2724 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2727 /* Generate code to do the initialization or destruction of the decls in VARS,
2728 a TREE_LIST of VAR_DECL with static storage duration.
2729 Whether initialization or destruction is performed is specified by INITP. */
2732 do_static_initialization_or_destruction (tree vars, bool initp)
2734 tree node, init_if_stmt, cond;
2736 /* Build the outer if-stmt to check for initialization or destruction. */
2737 init_if_stmt = begin_if_stmt ();
2738 cond = initp ? integer_one_node : integer_zero_node;
2739 cond = cp_build_binary_op (EQ_EXPR,
2742 finish_if_stmt_cond (cond, init_if_stmt);
2746 tree decl = TREE_VALUE (node);
2747 tree priority_if_stmt;
2751 /* If we don't need a destructor, there's nothing to do. Avoid
2752 creating a possibly empty if-stmt. */
2753 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2755 node = TREE_CHAIN (node);
2759 /* Remember that we had an initialization or finalization at this
2761 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2762 pi = get_priority_info (priority);
2764 pi->initializations_p = 1;
2766 pi->destructions_p = 1;
2768 /* Conditionalize this initialization on being in the right priority
2769 and being initializing/finalizing appropriately. */
2770 priority_if_stmt = begin_if_stmt ();
2771 cond = cp_build_binary_op (EQ_EXPR,
2773 build_int_cst (NULL_TREE, priority));
2774 finish_if_stmt_cond (cond, priority_if_stmt);
2776 /* Process initializers with same priority. */
2778 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2779 node = TREE_CHAIN (node))
2780 /* Do one initialization or destruction. */
2781 one_static_initialization_or_destruction (TREE_VALUE (node),
2782 TREE_PURPOSE (node), initp);
2784 /* Finish up the priority if-stmt body. */
2785 finish_then_clause (priority_if_stmt);
2786 finish_if_stmt (priority_if_stmt);
2790 /* Finish up the init/destruct if-stmt body. */
2791 finish_then_clause (init_if_stmt);
2792 finish_if_stmt (init_if_stmt);
2795 /* VARS is a list of variables with static storage duration which may
2796 need initialization and/or finalization. Remove those variables
2797 that don't really need to be initialized or finalized, and return
2798 the resulting list. The order in which the variables appear in
2799 VARS is in reverse order of the order in which they should actually
2800 be initialized. The list we return is in the unreversed order;
2801 i.e., the first variable should be initialized first. */
2804 prune_vars_needing_no_initialization (tree *vars)
2807 tree result = NULL_TREE;
2812 tree decl = TREE_VALUE (t);
2813 tree init = TREE_PURPOSE (t);
2815 /* Deal gracefully with error. */
2816 if (decl == error_mark_node)
2818 var = &TREE_CHAIN (t);
2822 /* The only things that can be initialized are variables. */
2823 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2825 /* If this object is not defined, we don't need to do anything
2827 if (DECL_EXTERNAL (decl))
2829 var = &TREE_CHAIN (t);
2833 /* Also, if the initializer already contains errors, we can bail
2835 if (init && TREE_CODE (init) == TREE_LIST
2836 && value_member (error_mark_node, init))
2838 var = &TREE_CHAIN (t);
2842 /* This variable is going to need initialization and/or
2843 finalization, so we add it to the list. */
2844 *var = TREE_CHAIN (t);
2845 TREE_CHAIN (t) = result;
2852 /* Make sure we have told the back end about all the variables in
2856 write_out_vars (tree vars)
2860 for (v = vars; v; v = TREE_CHAIN (v))
2862 tree var = TREE_VALUE (v);
2863 if (!var_finalized_p (var))
2865 import_export_decl (var);
2866 rest_of_decl_compilation (var, 1, 1);
2871 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2872 (otherwise) that will initialize all gobal objects with static
2873 storage duration having the indicated PRIORITY. */
2876 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2885 input_location = *locus;
2886 #ifdef USE_MAPPED_LOCATION
2892 /* We use `I' to indicate initialization and `D' to indicate
2894 function_key = constructor_p ? 'I' : 'D';
2896 /* We emit the function lazily, to avoid generating empty
2897 global constructors and destructors. */
2900 /* For Objective-C++, we may need to initialize metadata found in this module.
2901 This must be done _before_ any other static initializations. */
2902 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2903 && constructor_p && objc_static_init_needed_p ())
2905 body = start_objects (function_key, priority);
2906 static_ctors = objc_generate_static_init_call (static_ctors);
2909 /* Call the static storage duration function with appropriate
2911 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2913 /* Calls to pure or const functions will expand to nothing. */
2914 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2917 body = start_objects (function_key, priority);
2919 arguments = tree_cons (NULL_TREE,
2920 build_int_cst (NULL_TREE, priority),
2922 arguments = tree_cons (NULL_TREE,
2923 build_int_cst (NULL_TREE, constructor_p),
2925 finish_expr_stmt (build_function_call (fndecl, arguments));
2929 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2930 calls to any functions marked with attributes indicating that
2931 they should be called at initialization- or destruction-time. */
2932 if (priority == DEFAULT_INIT_PRIORITY)
2936 for (fns = constructor_p ? static_ctors : static_dtors;
2938 fns = TREE_CHAIN (fns))
2940 fndecl = TREE_VALUE (fns);
2942 /* Calls to pure/const functions will expand to nothing. */
2943 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2946 body = start_objects (function_key, priority);
2947 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2952 /* Close out the function. */
2954 finish_objects (function_key, priority, body);
2957 /* Generate constructor and destructor functions for the priority
2961 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2963 location_t *locus = (location_t *) data;
2964 int priority = (int) n->key;
2965 priority_info pi = (priority_info) n->value;
2967 /* Generate the functions themselves, but only if they are really
2969 if (pi->initializations_p
2970 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2971 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2972 if (pi->destructions_p
2973 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2974 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2976 /* Keep iterating. */
2980 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2981 decls referenced from frontend specific constructs; it will be called
2982 only for language-specific tree nodes.
2984 Here we must deal with member pointers. */
2987 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2988 tree from ATTRIBUTE_UNUSED)
2992 switch (TREE_CODE (t))
2995 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2996 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2999 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3000 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3003 if (DECL_VTABLE_OR_VTT_P (t))
3005 /* The ABI requires that all virtual tables be emitted
3006 whenever one of them is. */
3008 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3010 vtbl = TREE_CHAIN (vtbl))
3011 mark_decl_referenced (vtbl);
3013 else if (DECL_CONTEXT (t)
3014 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3015 /* If we need a static variable in a function, then we
3016 need the containing function. */
3017 mark_decl_referenced (DECL_CONTEXT (t));
3026 /* Java requires that we be able to reference a local address for a
3027 method, and not be confused by PLT entries. If hidden aliases are
3028 supported, emit one for each java function that we've emitted. */
3031 build_java_method_aliases (void)
3033 struct cgraph_node *node;
3035 #ifndef HAVE_GAS_HIDDEN
3039 for (node = cgraph_nodes; node ; node = node->next)
3041 tree fndecl = node->decl;
3043 if (TREE_ASM_WRITTEN (fndecl)
3044 && DECL_CONTEXT (fndecl)
3045 && TYPE_P (DECL_CONTEXT (fndecl))
3046 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3047 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3049 /* Mangle the name in a predictable way; we need to reference
3050 this from a java compiled object file. */
3051 tree oid, nid, alias;
3055 oid = DECL_ASSEMBLER_NAME (fndecl);
3056 oname = IDENTIFIER_POINTER (oid);
3057 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3058 nname = ACONCAT (("_ZGA", oname+2, NULL));
3059 nid = get_identifier (nname);
3061 alias = make_alias_for (fndecl, nid);
3062 TREE_PUBLIC (alias) = 1;
3063 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3065 assemble_alias (alias, oid);
3070 /* APPLE LOCAL begin radar 4721858 */
3071 static void emit_deferred (location_t *);
3072 /* APPLE LOCAL end radar 4721858 */
3074 /* This routine is called from the last rule in yyparse ().
3075 Its job is to create all the code needed to initialize and
3076 destroy the global aggregates. We do the destruction
3077 first, since that way we only need to reverse the decls once. */
3080 cp_finish_file (void)
3082 /* APPLE LOCAL begin radar 4721858 */
3084 /* APPLE LOCAL end radar 4721858 */
3086 locus = input_location;
3089 /* Bad parse errors. Just forget about it. */
3090 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3093 /* APPLE LOCAL radar 4874613 */
3094 /* dump of pch file moved to c_parse_file (). */
3096 #ifdef USE_MAPPED_LOCATION
3099 /* Otherwise, GDB can get confused, because in only knows
3100 about source for LINENO-1 lines. */
3104 /* We now have to write out all the stuff we put off writing out.
3107 o Template specializations that we have not yet instantiated,
3108 but which are needed.
3109 o Initialization and destruction for non-local objects with
3110 static storage duration. (Local objects with static storage
3111 duration are initialized when their scope is first entered,
3112 and are cleaned up via atexit.)
3113 o Virtual function tables.
3115 All of these may cause others to be needed. For example,
3116 instantiating one function may cause another to be needed, and
3117 generating the initializer for an object may cause templates to be
3118 instantiated, etc., etc. */
3120 timevar_push (TV_VARCONST);
3122 emit_support_tinfos ();
3124 /* APPLE LOCAL begin radar 4721858 */
3125 emit_instantiate_pending_templates (&locus);
3127 emit_deferred (&locus);
3130 /* This routine emits pending functions and instatiates pending templates
3131 as more opportunities arises. */
3134 emit_instantiate_pending_templates (location_t *locusp)
3139 unsigned ssdf_count = 0;
3142 /* APPLE LOCAL radar 4874626 */
3143 /* initialization removed. */
3145 /* APPLE LOCAL end radar 4721858 */
3154 /* If there are templates that we've put off instantiating, do
3156 instantiate_pending_templates (retries);
3159 /* Write out virtual tables as required. Note that writing out
3160 the virtual table for a template class may cause the
3161 instantiation of members of that class. If we write out
3162 vtables then we remove the class from our list so we don't
3163 have to look at it again. */
3165 while (keyed_classes != NULL_TREE
3166 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3169 keyed_classes = TREE_CHAIN (keyed_classes);
3175 tree next = TREE_CHAIN (t);
3179 if (maybe_emit_vtables (TREE_VALUE (next)))
3182 TREE_CHAIN (t) = TREE_CHAIN (next);
3187 next = TREE_CHAIN (t);
3191 /* Write out needed type info variables. We have to be careful
3192 looping through unemitted decls, because emit_tinfo_decl may
3193 cause other variables to be needed. New elements will be
3194 appended, and we remove from the vector those that actually
3196 for (i = VEC_length (tree, unemitted_tinfo_decls);
3197 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3198 if (emit_tinfo_decl (t))
3201 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3204 /* The list of objects with static storage duration is built up
3205 in reverse order. We clear STATIC_AGGREGATES so that any new
3206 aggregates added during the initialization of these will be
3207 initialized in the correct order when we next come around the
3209 vars = prune_vars_needing_no_initialization (&static_aggregates);
3213 /* We need to start a new initialization function each time
3214 through the loop. That's because we need to know which
3215 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3216 isn't computed until a function is finished, and written
3217 out. That's a deficiency in the back-end. When this is
3218 fixed, these initialization functions could all become
3219 inline, with resulting performance improvements. */
3222 /* Set the line and file, so that it is obviously not from
3224 /* APPLE LOCAL radar 4721858 */
3225 input_location = *locusp;
3226 ssdf_body = start_static_storage_duration_function (ssdf_count);
3228 /* Make sure the back end knows about all the variables. */
3229 write_out_vars (vars);
3231 /* First generate code to do all the initializations. */
3233 do_static_initialization_or_destruction (vars, /*initp=*/true);
3235 /* Then, generate code to do all the destructions. Do these
3236 in reverse order so that the most recently constructed
3237 variable is the first destroyed. If we're using
3238 __cxa_atexit, then we don't need to do this; functions
3239 were registered at initialization time to destroy the
3241 if (!flag_use_cxa_atexit && vars)
3243 vars = nreverse (vars);
3244 do_static_initialization_or_destruction (vars, /*initp=*/false);
3249 /* Finish up the static storage duration function for this
3251 /* APPLE LOCAL radar 4721858 */
3252 input_location = *locusp;
3253 finish_static_storage_duration_function (ssdf_body);
3255 /* All those initializations and finalizations might cause
3256 us to need more inline functions, more template
3257 instantiations, etc. */
3260 #ifdef USE_MAPPED_LOCATION
3263 /* APPLE LOCAL radar 4721858 */
3268 /* Go through the set of inline functions whose bodies have not
3269 been emitted yet. If out-of-line copies of these functions
3270 are required, emit them. */
3271 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3273 /* Does it need synthesizing? */
3274 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3275 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3277 /* Even though we're already at the top-level, we push
3278 there again. That way, when we pop back a few lines
3279 hence, all of our state is restored. Otherwise,
3280 finish_function doesn't clean things up, and we end
3281 up with CURRENT_FUNCTION_DECL set. */
3282 push_to_top_level ();
3283 /* The decl's location will mark where it was first
3284 needed. Save that so synthesize method can indicate
3285 where it was needed from, in case of error */
3286 input_location = DECL_SOURCE_LOCATION (decl);
3287 synthesize_method (decl);
3288 pop_from_top_level ();
3292 if (!DECL_SAVED_TREE (decl))
3295 /* We lie to the back-end, pretending that some functions
3296 are not defined when they really are. This keeps these
3297 functions from being put out unnecessarily. But, we must
3298 stop lying when the functions are referenced, or if they
3299 are not comdat since they need to be put out now. If
3300 DECL_INTERFACE_KNOWN, then we have already set
3301 DECL_EXTERNAL appropriately, so there's no need to check
3302 again, and we do not want to clear DECL_EXTERNAL if a
3303 previous call to import_export_decl set it.
3305 This is done in a separate for cycle, because if some
3306 deferred function is contained in another deferred
3307 function later in deferred_fns varray,
3308 rest_of_compilation would skip this function and we
3309 really cannot expand the same function twice. */
3310 import_export_decl (decl);
3311 if (DECL_NOT_REALLY_EXTERN (decl)
3312 && DECL_INITIAL (decl)
3313 && decl_needed_p (decl))
3314 DECL_EXTERNAL (decl) = 0;
3316 /* If we're going to need to write this function out, and
3317 there's already a body for it, create RTL for it now.
3318 (There might be no body if this is a method we haven't
3319 gotten around to synthesizing yet.) */
3320 if (!DECL_EXTERNAL (decl)
3321 && decl_needed_p (decl)
3322 && !TREE_ASM_WRITTEN (decl)
3323 && !cgraph_node (decl)->local.finalized)
3325 /* We will output the function; no longer consider it in this
3327 DECL_DEFER_OUTPUT (decl) = 0;
3328 /* Generate RTL for this function now that we know we
3330 expand_or_defer_fn (decl);
3331 /* If we're compiling -fsyntax-only pretend that this
3332 function has been written out so that we don't try to
3334 if (flag_syntax_only)
3335 TREE_ASM_WRITTEN (decl) = 1;
3340 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3343 /* Static data members are just like namespace-scope globals. */
3344 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3346 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3348 import_export_decl (decl);
3349 /* If this static data member is needed, provide it to the
3351 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3352 DECL_EXTERNAL (decl) = 0;
3354 if (VEC_length (tree, pending_statics) != 0
3355 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3356 VEC_length (tree, pending_statics)))
3362 /* APPLE LOCAL begin radar 4721858 */
3366 emit_deferred (location_t *locusp)
3370 bool reconsider = false;
3371 /* APPLE LOCAL end radar 4721858 */
3372 /* All used inline functions must have a definition at this point. */
3373 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3375 if (/* Check online inline functions that were actually used. */
3376 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3377 /* If the definition actually was available here, then the
3378 fact that the function was not defined merely represents
3379 that for some reason (use of a template repository,
3380 #pragma interface, etc.) we decided not to emit the
3382 && !DECL_INITIAL (decl)
3383 /* An explicit instantiation can be used to specify
3384 that the body is in another unit. It will have
3385 already verified there was a definition. */
3386 && !DECL_EXPLICIT_INSTANTIATION (decl))
3388 warning (0, "inline function %q+D used but never defined", decl);
3389 /* Avoid a duplicate warning from check_global_declaration_1. */
3390 TREE_NO_WARNING (decl) = 1;
3394 /* We give C linkage to static constructors and destructors. */
3395 push_lang_context (lang_name_c);
3397 /* Generate initialization and destruction functions for all
3398 priorities for which they are required. */
3399 if (priority_info_map)
3400 splay_tree_foreach (priority_info_map,
3401 generate_ctor_and_dtor_functions_for_priority,
3402 /* APPLE LOCAL radar 4721858 */
3406 /* If we have a ctor or this is obj-c++ and we need a static init,
3407 call generate_ctor_or_dtor_function. */
3408 if (static_ctors || (c_dialect_objc () && objc_static_init_needed_p ()))
3409 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3410 /* APPLE LOCAL radar 4721858 */
3411 DEFAULT_INIT_PRIORITY, locusp);
3413 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3414 /* APPLE LOCAL radar 4721858 */
3415 DEFAULT_INIT_PRIORITY, locusp);
3418 /* We're done with the splay-tree now. */
3419 if (priority_info_map)
3420 splay_tree_delete (priority_info_map);
3422 /* Generate any missing aliases. */
3423 maybe_apply_pending_pragma_weaks ();
3425 /* We're done with static constructors, so we can go back to "C++"
3427 pop_lang_context ();
3429 cgraph_finalize_compilation_unit ();
3432 /* Now, issue warnings about static, but not defined, functions,
3433 etc., and emit debugging information. */
3434 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3435 if (VEC_length (tree, pending_statics) != 0)
3437 check_global_declarations (VEC_address (tree, pending_statics),
3438 VEC_length (tree, pending_statics));
3439 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3440 VEC_length (tree, pending_statics));
3443 /* Generate hidden aliases for Java. */
3444 build_java_method_aliases ();
3448 /* The entire file is now complete. If requested, dump everything
3452 FILE *stream = dump_begin (TDI_tu, &flags);
3456 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3457 dump_end (TDI_tu, stream);
3461 timevar_pop (TV_VARCONST);
3463 if (flag_detailed_statistics)
3465 dump_tree_statistics ();
3466 dump_time_statistics ();
3468 /* APPLE LOCAL radar 4721858 */
3469 input_location = *locusp;
3471 #ifdef ENABLE_CHECKING
3472 validate_conversion_obstack ();
3473 #endif /* ENABLE_CHECKING */
3476 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3477 function to call in parse-tree form; it has not yet been
3478 semantically analyzed. ARGS are the arguments to the function.
3479 They have already been semantically analyzed. */
3482 build_offset_ref_call_from_tree (tree fn, tree args)
3491 object = TREE_OPERAND (fn, 0);
3493 if (processing_template_decl)
3495 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3496 || TREE_CODE (fn) == MEMBER_REF);
3497 if (type_dependent_expression_p (fn)
3498 || any_type_dependent_arguments_p (args))
3499 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3501 /* Transform the arguments and add the implicit "this"
3502 parameter. That must be done before the FN is transformed
3503 because we depend on the form of FN. */
3504 args = build_non_dependent_args (args);
3505 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3506 object = build_unary_op (ADDR_EXPR, object, 0);
3507 object = build_non_dependent_expr (object);
3508 args = tree_cons (NULL_TREE, object, args);
3509 /* Now that the arguments are done, transform FN. */
3510 fn = build_non_dependent_expr (fn);
3513 /* A qualified name corresponding to a bound pointer-to-member is
3514 represented as an OFFSET_REF:
3516 struct B { void g(); };
3518 void B::g() { (this->*p)(); } */
3519 if (TREE_CODE (fn) == OFFSET_REF)
3521 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3522 fn = TREE_OPERAND (fn, 1);
3523 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3524 args = tree_cons (NULL_TREE, object_addr, args);
3527 expr = build_function_call (fn, args);
3528 if (processing_template_decl && expr != error_mark_node)
3529 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3535 check_default_args (tree x)
3537 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3538 bool saw_def = false;
3539 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3540 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3542 if (TREE_PURPOSE (arg))
3546 error ("default argument missing for parameter %P of %q+#D", i, x);
3547 TREE_PURPOSE (arg) = error_mark_node;
3552 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3553 If DECL is a specialization or implicitly declared class member,
3554 generate the actual definition. */
3557 mark_used (tree decl)
3559 HOST_WIDE_INT saved_processing_template_decl = 0;
3561 /* If DECL is a BASELINK for a single function, then treat it just
3562 like the DECL for the function. Otherwise, if the BASELINK is
3563 for an overloaded function, we don't know which function was
3564 actually used until after overload resolution. */
3565 if (TREE_CODE (decl) == BASELINK)
3567 decl = BASELINK_FUNCTIONS (decl);
3568 if (really_overloaded_fn (decl))
3570 decl = OVL_CURRENT (decl);
3573 TREE_USED (decl) = 1;
3574 if (DECL_CLONED_FUNCTION_P (decl))
3575 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3576 /* If we don't need a value, then we don't need to synthesize DECL. */
3577 if (skip_evaluation)
3579 /* Normally, we can wait until instantiation-time to synthesize
3580 DECL. However, if DECL is a static data member initialized with
3581 a constant, we need the value right now because a reference to
3582 such a data member is not value-dependent. */
3583 if (TREE_CODE (decl) == VAR_DECL
3584 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3585 && DECL_CLASS_SCOPE_P (decl))
3587 /* Don't try to instantiate members of dependent types. We
3588 cannot just use dependent_type_p here because this function
3589 may be called from fold_non_dependent_expr, and then we may
3590 see dependent types, even though processing_template_decl
3592 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3593 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3595 /* Pretend that we are not in a template, even if we are, so
3596 that the static data member initializer will be processed. */
3597 saved_processing_template_decl = processing_template_decl;
3598 processing_template_decl = 0;
3601 if (processing_template_decl)
3604 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3605 && !TREE_ASM_WRITTEN (decl))
3606 /* Remember it, so we can check it was defined. */
3608 if (DECL_DEFERRED_FN (decl))
3611 /* Remember the current location for a function we will end up
3612 synthesizing. Then we can inform the user where it was
3613 required in the case of error. */
3614 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3615 && !DECL_THUNK_P (decl))
3616 DECL_SOURCE_LOCATION (decl) = input_location;
3618 note_vague_linkage_fn (decl);
3621 assemble_external (decl);
3623 /* Is it a synthesized method that needs to be synthesized? */
3624 if (TREE_CODE (decl) == FUNCTION_DECL
3625 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3626 && DECL_ARTIFICIAL (decl)
3627 && !DECL_THUNK_P (decl)
3628 && ! DECL_INITIAL (decl)
3629 /* Kludge: don't synthesize for default args. Unfortunately this
3630 rules out initializers of namespace-scoped objects too, but
3631 it's sort-of ok if the implicit ctor or dtor decl keeps
3632 pointing to the class location. */
3633 && current_function_decl)
3635 synthesize_method (decl);
3636 /* If we've already synthesized the method we don't need to
3637 do the instantiation test below. */
3639 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3640 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3641 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3642 || (TREE_CODE (decl) == FUNCTION_DECL
3643 && DECL_INLINE (DECL_TEMPLATE_RESULT
3644 (template_for_substitution (decl))))
3645 /* We need to instantiate static data members so that there
3646 initializers are available in integral constant
3648 || (TREE_CODE (decl) == VAR_DECL
3649 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3650 /* If this is a function or variable that is an instance of some
3651 template, we now know that we will need to actually do the
3652 instantiation. We check that DECL is not an explicit
3653 instantiation because that is not checked in instantiate_decl.
3655 We put off instantiating functions in order to improve compile
3656 times. Maintaining a stack of active functions is expensive,
3657 and the inliner knows to instantiate any functions it might
3658 need. Therefore, we always try to defer instantiation. */
3659 instantiate_decl (decl, /*defer_ok=*/true,
3660 /*expl_inst_class_mem_p=*/false);
3662 processing_template_decl = saved_processing_template_decl;
3665 #include "gt-cp-decl2.h"