1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
55 extern cpp_reader *parse_in;
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
59 typedef struct priority_info_s {
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
62 int initializations_p;
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
68 static void mark_vtable_entries (tree);
69 static bool maybe_emit_vtables (tree);
70 static bool acceptable_java_type (tree);
71 static tree start_objects (int, int);
72 static void finish_objects (int, int, tree);
73 static tree start_static_storage_duration_function (unsigned);
74 static void finish_static_storage_duration_function (tree);
75 static priority_info get_priority_info (int);
76 static void do_static_initialization_or_destruction (tree, bool);
77 static void one_static_initialization_or_destruction (tree, tree, bool);
78 static void generate_ctor_or_dtor_function (bool, int, location_t *);
79 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
81 static tree prune_vars_needing_no_initialization (tree *);
82 static void write_out_vars (tree);
83 static void import_export_class (tree);
84 static tree get_guard_bits (tree);
85 static void determine_visibility_from_class (tree, tree);
87 /* A list of static class variables. This is needed, because a
88 static class variable can be declared inside the class without
89 an initializer, and then initialized, statically, outside the class. */
90 static GTY(()) VEC(tree,gc) *pending_statics;
92 /* A list of functions which were declared inline, but which we
93 may need to emit outline anyway. */
94 static GTY(()) VEC(tree,gc) *deferred_fns;
96 /* Nonzero if we're done parsing and into end-of-file activities. */
100 /* Functions called along with real static constructors and destructors. */
107 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
108 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
109 that apply to the function). */
112 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
117 if (fntype == error_mark_node || ctype == error_mark_node)
118 return error_mark_node;
120 type_quals = quals & ~TYPE_QUAL_RESTRICT;
121 ctype = cp_build_qualified_type (ctype, type_quals);
122 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
123 (TREE_CODE (fntype) == METHOD_TYPE
124 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
125 : TYPE_ARG_TYPES (fntype)));
126 raises = TYPE_RAISES_EXCEPTIONS (fntype);
128 fntype = build_exception_variant (fntype, raises);
133 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
137 cp_build_parm_decl (tree name, tree type)
139 tree parm = build_decl (PARM_DECL, name, type);
140 /* DECL_ARG_TYPE is only used by the back end and the back end never
142 if (!processing_template_decl)
143 DECL_ARG_TYPE (parm) = type_passed_as (type);
147 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
151 build_artificial_parm (tree name, tree type)
153 tree parm = cp_build_parm_decl (name, type);
154 DECL_ARTIFICIAL (parm) = 1;
155 /* All our artificial parms are implicitly `const'; they cannot be
157 TREE_READONLY (parm) = 1;
161 /* Constructors for types with virtual baseclasses need an "in-charge" flag
162 saying whether this constructor is responsible for initialization of
163 virtual baseclasses or not. All destructors also need this "in-charge"
164 flag, which additionally determines whether or not the destructor should
165 free the memory for the object.
167 This function adds the "in-charge" flag to member function FN if
168 appropriate. It is called from grokclassfn and tsubst.
169 FN must be either a constructor or destructor.
171 The in-charge flag follows the 'this' parameter, and is followed by the
172 VTT parm (if any), then the user-written parms. */
175 maybe_retrofit_in_chrg (tree fn)
177 tree basetype, arg_types, parms, parm, fntype;
179 /* If we've already add the in-charge parameter don't do it again. */
180 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
183 /* When processing templates we can't know, in general, whether or
184 not we're going to have virtual baseclasses. */
185 if (processing_template_decl)
188 /* We don't need an in-charge parameter for constructors that don't
189 have virtual bases. */
190 if (DECL_CONSTRUCTOR_P (fn)
191 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
194 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
195 basetype = TREE_TYPE (TREE_VALUE (arg_types));
196 arg_types = TREE_CHAIN (arg_types);
198 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
200 /* If this is a subobject constructor or destructor, our caller will
201 pass us a pointer to our VTT. */
202 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
204 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
206 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
207 TREE_CHAIN (parm) = parms;
210 /* ...and then to TYPE_ARG_TYPES. */
211 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
213 DECL_HAS_VTT_PARM_P (fn) = 1;
216 /* Then add the in-charge parm (before the VTT parm). */
217 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
218 TREE_CHAIN (parm) = parms;
220 arg_types = hash_tree_chain (integer_type_node, arg_types);
222 /* Insert our new parameter(s) into the list. */
223 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
225 /* And rebuild the function type. */
226 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
228 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
229 fntype = build_exception_variant (fntype,
230 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
231 TREE_TYPE (fn) = fntype;
233 /* Now we've got the in-charge parameter. */
234 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
237 /* Classes overload their constituent function names automatically.
238 When a function name is declared in a record structure,
239 its name is changed to it overloaded name. Since names for
240 constructors and destructors can conflict, we place a leading
243 CNAME is the name of the class we are grokking for.
245 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
247 FLAGS contains bits saying what's special about today's
248 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
250 If FUNCTION is a destructor, then we must add the `auto-delete' field
251 as a second parameter. There is some hair associated with the fact
252 that we must "declare" this variable in the manner consistent with the
253 way the rest of the arguments were declared.
255 QUALS are the qualifiers for the this pointer. */
258 grokclassfn (tree ctype, tree function, enum overload_flags flags)
260 tree fn_name = DECL_NAME (function);
262 /* Even within an `extern "C"' block, members get C++ linkage. See
263 [dcl.link] for details. */
264 SET_DECL_LANGUAGE (function, lang_cplusplus);
266 if (fn_name == NULL_TREE)
268 error ("name missing for member function");
269 fn_name = get_identifier ("<anonymous>");
270 DECL_NAME (function) = fn_name;
273 DECL_CONTEXT (function) = ctype;
275 if (flags == DTOR_FLAG)
276 DECL_DESTRUCTOR_P (function) = 1;
278 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
279 maybe_retrofit_in_chrg (function);
282 /* Create an ARRAY_REF, checking for the user doing things backwards
286 grok_array_decl (tree array_expr, tree index_exp)
290 tree orig_array_expr = array_expr;
291 tree orig_index_exp = index_exp;
293 if (error_operand_p (array_expr) || error_operand_p (index_exp))
294 return error_mark_node;
296 if (processing_template_decl)
298 if (type_dependent_expression_p (array_expr)
299 || type_dependent_expression_p (index_exp))
300 return build_min_nt (ARRAY_REF, array_expr, index_exp,
301 NULL_TREE, NULL_TREE);
302 array_expr = build_non_dependent_expr (array_expr);
303 index_exp = build_non_dependent_expr (index_exp);
306 type = TREE_TYPE (array_expr);
308 type = non_reference (type);
310 /* If they have an `operator[]', use that. */
311 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
312 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
313 array_expr, index_exp, NULL_TREE,
314 /*overloaded_p=*/NULL);
319 /* Otherwise, create an ARRAY_REF for a pointer or array type.
320 It is a little-known fact that, if `a' is an array and `i' is
321 an int, you can write `i[a]', which means the same thing as
323 if (TREE_CODE (type) == ARRAY_TYPE)
326 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
328 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
331 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
333 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
335 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
338 if ((p1 && i2) && (i1 && p2))
339 error ("ambiguous conversion for array subscript");
342 array_expr = p1, index_exp = i2;
344 array_expr = p2, index_exp = i1;
347 error ("invalid types %<%T[%T]%> for array subscript",
348 type, TREE_TYPE (index_exp));
349 return error_mark_node;
352 if (array_expr == error_mark_node || index_exp == error_mark_node)
353 error ("ambiguous conversion for array subscript");
355 expr = build_array_ref (array_expr, index_exp);
357 if (processing_template_decl && expr != error_mark_node)
358 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
359 NULL_TREE, NULL_TREE);
363 /* Given the cast expression EXP, checking out its validity. Either return
364 an error_mark_node if there was an unavoidable error, return a cast to
365 void for trying to delete a pointer w/ the value 0, or return the
366 call to delete. If DOING_VEC is true, we handle things differently
367 for doing an array delete.
368 Implements ARM $5.3.4. This is called from the parser. */
371 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
375 if (exp == error_mark_node)
378 if (processing_template_decl)
380 t = build_min (DELETE_EXPR, void_type_node, exp, size);
381 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
382 DELETE_EXPR_USE_VEC (t) = doing_vec;
383 TREE_SIDE_EFFECTS (t) = 1;
387 /* An array can't have been allocated by new, so complain. */
388 if (TREE_CODE (exp) == VAR_DECL
389 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
390 warning (0, "deleting array %q#D", exp);
392 t = build_expr_type_conversion (WANT_POINTER, exp, true);
394 if (t == NULL_TREE || t == error_mark_node)
396 error ("type %q#T argument given to %<delete%>, expected pointer",
398 return error_mark_node;
401 type = TREE_TYPE (t);
403 /* As of Valley Forge, you can delete a pointer to const. */
405 /* You can't delete functions. */
406 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
408 error ("cannot delete a function. Only pointer-to-objects are "
409 "valid arguments to %<delete%>");
410 return error_mark_node;
413 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
414 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
416 warning (0, "deleting %qT is undefined", type);
420 /* Deleting a pointer with the value zero is valid and has no effect. */
421 if (integer_zerop (t))
422 return build1 (NOP_EXPR, void_type_node, t);
425 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
426 sfk_deleting_destructor,
429 return build_delete (type, t, sfk_deleting_destructor,
430 LOOKUP_NORMAL, use_global_delete);
433 /* Report an error if the indicated template declaration is not the
434 sort of thing that should be a member template. */
437 check_member_template (tree tmpl)
441 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
442 decl = DECL_TEMPLATE_RESULT (tmpl);
444 if (TREE_CODE (decl) == FUNCTION_DECL
445 || (TREE_CODE (decl) == TYPE_DECL
446 && IS_AGGR_TYPE (TREE_TYPE (decl))))
448 if (current_function_decl)
449 /* 14.5.2.2 [temp.mem]
451 A local class shall not have member templates. */
452 error ("invalid declaration of member template %q#D in local class",
455 /* The parser rejects any use of virtual in a function template. */
456 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
457 && DECL_VIRTUAL_P (decl)));
459 /* The debug-information generating code doesn't know what to do
460 with member templates. */
461 DECL_IGNORED_P (tmpl) = 1;
464 error ("template declaration of %q#D", decl);
467 /* Return true iff TYPE is a valid Java parameter or return type. */
470 acceptable_java_type (tree type)
472 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
474 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
476 type = TREE_TYPE (type);
477 if (TREE_CODE (type) == RECORD_TYPE)
480 if (! TYPE_FOR_JAVA (type))
482 if (! CLASSTYPE_TEMPLATE_INFO (type))
484 args = CLASSTYPE_TI_ARGS (type);
485 i = TREE_VEC_LENGTH (args);
488 type = TREE_VEC_ELT (args, i);
489 if (TREE_CODE (type) == POINTER_TYPE)
490 type = TREE_TYPE (type);
491 if (! TYPE_FOR_JAVA (type))
500 /* For a METHOD in a Java class CTYPE, return true if
501 the parameter and return types are valid Java types.
502 Otherwise, print appropriate error messages, and return false. */
505 check_java_method (tree method)
508 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
509 tree ret_type = TREE_TYPE (TREE_TYPE (method));
511 if (!acceptable_java_type (ret_type))
513 error ("Java method %qD has non-Java return type %qT",
518 arg_types = TREE_CHAIN (arg_types);
519 if (DECL_HAS_IN_CHARGE_PARM_P (method))
520 arg_types = TREE_CHAIN (arg_types);
521 if (DECL_HAS_VTT_PARM_P (method))
522 arg_types = TREE_CHAIN (arg_types);
524 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
526 tree type = TREE_VALUE (arg_types);
527 if (!acceptable_java_type (type))
529 error ("Java method %qD has non-Java parameter type %qT",
537 /* Sanity check: report error if this function FUNCTION is not
538 really a member of the class (CTYPE) it is supposed to belong to.
539 TEMPLATE_PARMS is used to specify the template parameters of a member
540 template passed as FUNCTION_DECL. If the member template is passed as a
541 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
542 from the declaration. If the function is not a function template, it
544 It returns the original declaration for the function, or NULL_TREE
545 if no declaration was found (and an error was emitted). */
548 check_classfn (tree ctype, tree function, tree template_parms)
553 if (DECL_USE_TEMPLATE (function)
554 && !(TREE_CODE (function) == TEMPLATE_DECL
555 && DECL_TEMPLATE_SPECIALIZATION (function))
556 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
557 /* Since this is a specialization of a member template,
558 we're not going to find the declaration in the class.
561 struct S { template <typename T> void f(T); };
562 template <> void S::f(int);
564 we're not going to find `S::f(int)', but there's no
565 reason we should, either. We let our callers know we didn't
566 find the method, but we don't complain. */
569 /* Basic sanity check: for a template function, the template parameters
570 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
571 if (TREE_CODE (function) == TEMPLATE_DECL)
573 gcc_assert (!template_parms
574 || comp_template_parms (template_parms,
575 DECL_TEMPLATE_PARMS (function)));
576 template_parms = DECL_TEMPLATE_PARMS (function);
579 /* OK, is this a definition of a member template? */
580 is_template = (template_parms != NULL_TREE);
582 ix = class_method_index_for_fn (complete_type (ctype), function);
585 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
586 tree fndecls, fndecl = 0;
589 const char *format = NULL;
591 pushed_scope = push_scope (ctype);
592 for (fndecls = VEC_index (tree, methods, ix);
593 fndecls; fndecls = OVL_NEXT (fndecls))
597 fndecl = OVL_CURRENT (fndecls);
598 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
599 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
601 /* We cannot simply call decls_match because this doesn't
602 work for static member functions that are pretending to
603 be methods, and because the name may have been changed by
606 /* Get rid of the this parameter on functions that become
608 if (DECL_STATIC_FUNCTION_P (fndecl)
609 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
610 p1 = TREE_CHAIN (p1);
612 /* A member template definition only matches a member template
614 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
617 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
618 TREE_TYPE (TREE_TYPE (fndecl)))
619 && compparms (p1, p2)
621 || comp_template_parms (template_parms,
622 DECL_TEMPLATE_PARMS (fndecl)))
623 && (DECL_TEMPLATE_SPECIALIZATION (function)
624 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
625 && (!DECL_TEMPLATE_SPECIALIZATION (function)
626 || (DECL_TI_TEMPLATE (function)
627 == DECL_TI_TEMPLATE (fndecl))))
631 pop_scope (pushed_scope);
633 return OVL_CURRENT (fndecls);
634 error ("prototype for %q#D does not match any in class %qT",
636 is_conv_op = DECL_CONV_FN_P (fndecl);
639 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
640 fndecls = VEC_index (tree, methods, ix);
643 fndecl = OVL_CURRENT (fndecls);
644 fndecls = OVL_NEXT (fndecls);
646 if (!fndecls && is_conv_op)
648 if (VEC_length (tree, methods) > (size_t) ++ix)
650 fndecls = VEC_index (tree, methods, ix);
651 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
663 format = N_("candidates are: %+#D");
665 format = N_("candidate is: %+#D");
666 error (format, fndecl);
669 else if (!COMPLETE_TYPE_P (ctype))
670 cxx_incomplete_type_error (function, ctype);
672 error ("no %q#D member function declared in class %qT",
675 /* If we did not find the method in the class, add it to avoid
676 spurious errors (unless the CTYPE is not yet defined, in which
677 case we'll only confuse ourselves when the function is declared
678 properly within the class. */
679 if (COMPLETE_TYPE_P (ctype))
680 add_method (ctype, function, NULL_TREE);
684 /* DECL is a function with vague linkage. Remember it so that at the
685 end of the translation unit we can decide whether or not to emit
689 note_vague_linkage_fn (tree decl)
691 if (!DECL_DEFERRED_FN (decl))
693 DECL_DEFERRED_FN (decl) = 1;
694 DECL_DEFER_OUTPUT (decl) = 1;
695 VEC_safe_push (tree, gc, deferred_fns, decl);
699 /* Like note_vague_linkage_fn but for variables. */
702 note_vague_linkage_var (tree var)
704 VEC_safe_push (tree, gc, pending_statics, var);
707 /* We have just processed the DECL, which is a static data member.
708 The other parameters are as for cp_finish_decl. */
711 finish_static_data_member_decl (tree decl,
712 tree init, bool init_const_expr_p,
716 gcc_assert (TREE_PUBLIC (decl));
718 DECL_CONTEXT (decl) = current_class_type;
720 /* We cannot call pushdecl here, because that would fill in the
721 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
722 the right thing, namely, to put this decl out straight away. */
724 if (! processing_template_decl)
725 note_vague_linkage_var (decl);
727 if (LOCAL_CLASS_P (current_class_type))
728 pedwarn ("local class %q#T shall not have static data member %q#D",
729 current_class_type, decl);
731 /* Static consts need not be initialized in the class definition. */
732 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
734 static int explained = 0;
736 error ("initializer invalid for static member with constructor");
739 error ("(an out of class initialization is required)");
744 /* Force the compiler to know when an uninitialized static const
745 member is being used. */
746 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
747 TREE_USED (decl) = 1;
748 DECL_INITIAL (decl) = init;
749 DECL_IN_AGGR_P (decl) = 1;
751 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
754 /* DECLARATOR and DECLSPECS correspond to a class member. The other
755 parameters are as for cp_finish_decl. Return the DECL for the
756 class member declared. */
759 grokfield (const cp_declarator *declarator,
760 cp_decl_specifier_seq *declspecs,
761 tree init, bool init_const_expr_p,
766 const char *asmspec = 0;
767 int flags = LOOKUP_ONLYCONVERTING;
769 if (!declspecs->any_specifiers_p
770 && declarator->kind == cdk_id
771 && declarator->u.id.qualifying_scope
772 && TYPE_P (declarator->u.id.qualifying_scope)
773 && IS_AGGR_TYPE (declarator->u.id.qualifying_scope)
774 && TREE_CODE (declarator->u.id.unqualified_name) == IDENTIFIER_NODE)
775 /* Access declaration */
776 return do_class_using_decl (declarator->u.id.qualifying_scope,
777 declarator->u.id.unqualified_name);
780 && TREE_CODE (init) == TREE_LIST
781 && TREE_VALUE (init) == error_mark_node
782 && TREE_CHAIN (init) == NULL_TREE)
785 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
786 if (! value || error_operand_p (value))
787 /* friend or constructor went bad. */
788 return error_mark_node;
790 if (TREE_CODE (value) == TYPE_DECL && init)
792 error ("typedef %qD is initialized (use __typeof__ instead)", value);
796 /* Pass friendly classes back. */
797 if (value == void_type_node)
800 /* Pass friend decls back. */
801 if ((TREE_CODE (value) == FUNCTION_DECL
802 || TREE_CODE (value) == TEMPLATE_DECL)
803 && DECL_CONTEXT (value) != current_class_type)
806 if (DECL_NAME (value) != NULL_TREE
807 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
808 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
809 error ("member %qD conflicts with virtual function table field name",
812 /* Stash away type declarations. */
813 if (TREE_CODE (value) == TYPE_DECL)
815 DECL_NONLOCAL (value) = 1;
816 DECL_CONTEXT (value) = current_class_type;
818 if (processing_template_decl)
819 value = push_template_decl (value);
823 /* Avoid storing attributes in template parameters:
824 tsubst is not ready to handle them. */
825 tree type = TREE_TYPE (value);
826 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
827 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
828 sorry ("applying attributes to template parameters is not implemented");
830 cplus_decl_attributes (&value, attrlist, 0);
836 if (DECL_IN_AGGR_P (value))
838 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
839 return void_type_node;
843 asmspec = TREE_STRING_POINTER (asmspec_tree);
847 if (TREE_CODE (value) == FUNCTION_DECL)
849 /* Initializers for functions are rejected early in the parser.
850 If we get here, it must be a pure specifier for a method. */
851 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
853 gcc_assert (error_operand_p (init) || integer_zerop (init));
854 DECL_PURE_VIRTUAL_P (value) = 1;
858 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
859 error ("initializer specified for static member function %qD",
863 else if (pedantic && TREE_CODE (value) != VAR_DECL)
864 /* Already complained in grokdeclarator. */
866 else if (!processing_template_decl)
868 if (TREE_CODE (init) == CONSTRUCTOR)
869 init = digest_init (TREE_TYPE (value), init);
871 init = integral_constant_value (init);
873 if (init != error_mark_node && !TREE_CONSTANT (init))
875 /* We can allow references to things that are effectively
876 static, since references are initialized with the
878 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
879 || (TREE_STATIC (init) == 0
880 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
882 error ("field initializer is not constant");
883 init = error_mark_node;
889 if (processing_template_decl
890 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
892 value = push_template_decl (value);
893 if (error_operand_p (value))
894 return error_mark_node;
898 cplus_decl_attributes (&value, attrlist, 0);
900 switch (TREE_CODE (value))
903 finish_static_data_member_decl (value, init, init_const_expr_p,
904 asmspec_tree, flags);
909 error ("%<asm%> specifiers are not permitted on non-static data members");
910 if (DECL_INITIAL (value) == error_mark_node)
911 init = error_mark_node;
912 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
914 DECL_INITIAL (value) = init;
915 DECL_IN_AGGR_P (value) = 1;
920 set_user_assembler_name (value, asmspec);
922 cp_finish_decl (value,
924 /*init_const_expr_p=*/false,
925 asmspec_tree, flags);
927 /* Pass friends back this way. */
928 if (DECL_FRIEND_P (value))
929 return void_type_node;
931 DECL_IN_AGGR_P (value) = 1;
940 /* Like `grokfield', but for bitfields.
941 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
944 grokbitfield (const cp_declarator *declarator,
945 cp_decl_specifier_seq *declspecs, tree width)
947 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
949 if (value == error_mark_node)
950 return NULL_TREE; /* friends went bad. */
952 /* Pass friendly classes back. */
953 if (TREE_CODE (value) == VOID_TYPE)
954 return void_type_node;
956 if (TREE_CODE (value) == TYPE_DECL)
958 error ("cannot declare %qD to be a bit-field type", value);
962 /* Usually, finish_struct_1 catches bitfields with invalid types.
963 But, in the case of bitfields with function type, we confuse
964 ourselves into thinking they are member functions, so we must
966 if (TREE_CODE (value) == FUNCTION_DECL)
968 error ("cannot declare bit-field %qD with function type",
973 if (DECL_IN_AGGR_P (value))
975 error ("%qD is already defined in the class %qT", value,
976 DECL_CONTEXT (value));
977 return void_type_node;
980 if (TREE_STATIC (value))
982 error ("static member %qD cannot be a bit-field", value);
985 finish_decl (value, NULL_TREE, NULL_TREE);
987 if (width != error_mark_node)
989 constant_expression_warning (width);
990 DECL_INITIAL (value) = width;
991 SET_DECL_C_BIT_FIELD (value);
994 DECL_IN_AGGR_P (value) = 1;
1000 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1002 if (*decl == NULL_TREE || *decl == void_type_node)
1005 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1006 decl = &DECL_TEMPLATE_RESULT (*decl);
1008 decl_attributes (decl, attributes, flags);
1010 if (TREE_CODE (*decl) == TYPE_DECL)
1011 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1014 /* Walks through the namespace- or function-scope anonymous union
1015 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1016 Returns one of the fields for use in the mangled name. */
1019 build_anon_union_vars (tree type, tree object)
1021 tree main_decl = NULL_TREE;
1024 /* Rather than write the code to handle the non-union case,
1025 just give an error. */
1026 if (TREE_CODE (type) != UNION_TYPE)
1027 error ("anonymous struct not inside named type");
1029 for (field = TYPE_FIELDS (type);
1031 field = TREE_CHAIN (field))
1036 if (DECL_ARTIFICIAL (field))
1038 if (TREE_CODE (field) != FIELD_DECL)
1040 pedwarn ("%q+#D invalid; an anonymous union can only "
1041 "have non-static data members", field);
1045 if (TREE_PRIVATE (field))
1046 pedwarn ("private member %q+#D in anonymous union", field);
1047 else if (TREE_PROTECTED (field))
1048 pedwarn ("protected member %q+#D in anonymous union", field);
1050 if (processing_template_decl)
1051 ref = build_min_nt (COMPONENT_REF, object,
1052 DECL_NAME (field), NULL_TREE);
1054 ref = build_class_member_access_expr (object, field, NULL_TREE,
1057 if (DECL_NAME (field))
1061 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1063 base = get_base_address (object);
1064 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1065 TREE_STATIC (decl) = TREE_STATIC (base);
1066 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1068 SET_DECL_VALUE_EXPR (decl, ref);
1069 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1071 decl = pushdecl (decl);
1073 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1074 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1078 if (main_decl == NULL_TREE)
1085 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1086 anonymous union, then all members must be laid out together. PUBLIC_P
1087 is nonzero if this union is not declared static. */
1090 finish_anon_union (tree anon_union_decl)
1096 if (anon_union_decl == error_mark_node)
1099 type = TREE_TYPE (anon_union_decl);
1100 public_p = TREE_PUBLIC (anon_union_decl);
1102 /* The VAR_DECL's context is the same as the TYPE's context. */
1103 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1105 if (TYPE_FIELDS (type) == NULL_TREE)
1110 error ("namespace-scope anonymous aggregates must be static");
1114 main_decl = build_anon_union_vars (type, anon_union_decl);
1115 if (main_decl == error_mark_node)
1117 if (main_decl == NULL_TREE)
1119 warning (0, "anonymous union with no members");
1123 if (!processing_template_decl)
1125 /* Use main_decl to set the mangled name. */
1126 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1127 mangle_decl (anon_union_decl);
1128 DECL_NAME (anon_union_decl) = NULL_TREE;
1131 pushdecl (anon_union_decl);
1132 if (building_stmt_tree ()
1133 && at_function_scope_p ())
1134 add_decl_expr (anon_union_decl);
1135 else if (!processing_template_decl)
1136 rest_of_decl_compilation (anon_union_decl,
1137 toplevel_bindings_p (), at_eof);
1140 /* Auxiliary functions to make type signatures for
1141 `operator new' and `operator delete' correspond to
1142 what compiler will be expecting. */
1145 coerce_new_type (tree type)
1148 tree args = TYPE_ARG_TYPES (type);
1150 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1152 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1155 error ("%<operator new%> must return type %qT", ptr_type_node);
1158 if (!args || args == void_list_node
1159 || !same_type_p (TREE_VALUE (args), size_type_node))
1162 if (args && args != void_list_node)
1163 args = TREE_CHAIN (args);
1164 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1165 "as first parameter", size_type_node);
1170 args = tree_cons (NULL_TREE, size_type_node, args);
1173 type = build_exception_variant
1174 (build_function_type (ptr_type_node, args),
1175 TYPE_RAISES_EXCEPTIONS (type));
1183 coerce_delete_type (tree type)
1186 tree args = TYPE_ARG_TYPES (type);
1188 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1190 if (!same_type_p (TREE_TYPE (type), void_type_node))
1193 error ("%<operator delete%> must return type %qT", void_type_node);
1196 if (!args || args == void_list_node
1197 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1200 if (args && args != void_list_node)
1201 args = TREE_CHAIN (args);
1202 error ("%<operator delete%> takes type %qT as first parameter",
1208 args = tree_cons (NULL_TREE, ptr_type_node, args);
1211 type = build_exception_variant
1212 (build_function_type (void_type_node, args),
1213 TYPE_RAISES_EXCEPTIONS (type));
1222 mark_vtable_entries (tree decl)
1225 unsigned HOST_WIDE_INT idx;
1227 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1232 STRIP_NOPS (fnaddr);
1234 if (TREE_CODE (fnaddr) != ADDR_EXPR
1235 && TREE_CODE (fnaddr) != FDESC_EXPR)
1236 /* This entry is an offset: a virtual base class offset, a
1237 virtual call offset, an RTTI offset, etc. */
1240 fn = TREE_OPERAND (fnaddr, 0);
1241 TREE_ADDRESSABLE (fn) = 1;
1242 /* When we don't have vcall offsets, we output thunks whenever
1243 we output the vtables that contain them. With vcall offsets,
1244 we know all the thunks we'll need when we emit a virtual
1245 function, so we emit the thunks there instead. */
1246 if (DECL_THUNK_P (fn))
1247 use_thunk (fn, /*emit_p=*/0);
1252 /* Set DECL up to have the closest approximation of "initialized common"
1253 linkage available. */
1256 comdat_linkage (tree decl)
1259 make_decl_one_only (decl);
1260 else if (TREE_CODE (decl) == FUNCTION_DECL
1261 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1262 /* We can just emit function and compiler-generated variables
1263 statically; having multiple copies is (for the most part) only
1266 There are two correctness issues, however: the address of a
1267 template instantiation with external linkage should be the
1268 same, independent of what translation unit asks for the
1269 address, and this will not hold when we emit multiple copies of
1270 the function. However, there's little else we can do.
1272 Also, by default, the typeinfo implementation assumes that
1273 there will be only one copy of the string used as the name for
1274 each type. Therefore, if weak symbols are unavailable, the
1275 run-time library should perform a more conservative check; it
1276 should perform a string comparison, rather than an address
1278 TREE_PUBLIC (decl) = 0;
1281 /* Static data member template instantiations, however, cannot
1282 have multiple copies. */
1283 if (DECL_INITIAL (decl) == 0
1284 || DECL_INITIAL (decl) == error_mark_node)
1285 DECL_COMMON (decl) = 1;
1286 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1288 DECL_COMMON (decl) = 1;
1289 DECL_INITIAL (decl) = error_mark_node;
1291 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1293 /* We can't do anything useful; leave vars for explicit
1295 DECL_EXTERNAL (decl) = 1;
1296 DECL_NOT_REALLY_EXTERN (decl) = 0;
1300 if (DECL_LANG_SPECIFIC (decl))
1301 DECL_COMDAT (decl) = 1;
1304 /* For win32 we also want to put explicit instantiations in
1305 linkonce sections, so that they will be merged with implicit
1306 instantiations; otherwise we get duplicate symbol errors.
1307 For Darwin we do not want explicit instantiations to be
1311 maybe_make_one_only (tree decl)
1313 /* We used to say that this was not necessary on targets that support weak
1314 symbols, because the implicit instantiations will defer to the explicit
1315 one. However, that's not actually the case in SVR4; a strong definition
1316 after a weak one is an error. Also, not making explicit
1317 instantiations one_only means that we can end up with two copies of
1318 some template instantiations. */
1322 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1323 we can get away with not emitting them if they aren't used. We need
1324 to for variables so that cp_finish_decl will update their linkage,
1325 because their DECL_INITIAL may not have been set properly yet. */
1327 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1328 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1329 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1331 make_decl_one_only (decl);
1333 if (TREE_CODE (decl) == VAR_DECL)
1335 DECL_COMDAT (decl) = 1;
1336 /* Mark it needed so we don't forget to emit it. */
1337 mark_decl_referenced (decl);
1342 /* Determine whether or not we want to specifically import or export CTYPE,
1343 using various heuristics. */
1346 import_export_class (tree ctype)
1348 /* -1 for imported, 1 for exported. */
1349 int import_export = 0;
1351 /* It only makes sense to call this function at EOF. The reason is
1352 that this function looks at whether or not the first non-inline
1353 non-abstract virtual member function has been defined in this
1354 translation unit. But, we can't possibly know that until we've
1355 seen the entire translation unit. */
1356 gcc_assert (at_eof);
1358 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1361 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1362 we will have CLASSTYPE_INTERFACE_ONLY set but not
1363 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1364 heuristic because someone will supply a #pragma implementation
1365 elsewhere, and deducing it here would produce a conflict. */
1366 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1369 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1371 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1373 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1374 && !flag_implicit_templates)
1375 /* For a template class, without -fimplicit-templates, check the
1376 repository. If the virtual table is assigned to this
1377 translation unit, then export the class; otherwise, import
1379 import_export = repo_export_class_p (ctype) ? 1 : -1;
1380 else if (TYPE_POLYMORPHIC_P (ctype))
1382 /* The ABI specifies that the virtual table and associated
1383 information are emitted with the key method, if any. */
1384 tree method = CLASSTYPE_KEY_METHOD (ctype);
1385 /* If weak symbol support is not available, then we must be
1386 careful not to emit the vtable when the key function is
1387 inline. An inline function can be defined in multiple
1388 translation units. If we were to emit the vtable in each
1389 translation unit containing a definition, we would get
1390 multiple definition errors at link-time. */
1391 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1392 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1395 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1396 a definition anywhere else. */
1397 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1400 /* Allow backends the chance to overrule the decision. */
1401 if (targetm.cxx.import_export_class)
1402 import_export = targetm.cxx.import_export_class (ctype, import_export);
1406 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1407 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1411 /* Return true if VAR has already been provided to the back end; in that
1412 case VAR should not be modified further by the front end. */
1414 var_finalized_p (tree var)
1416 return cgraph_varpool_node (var)->finalized;
1419 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1420 must be emitted in this translation unit. Mark it as such. */
1423 mark_needed (tree decl)
1425 /* It's possible that we no longer need to set
1426 TREE_SYMBOL_REFERENCED here directly, but doing so is
1428 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1429 mark_decl_referenced (decl);
1432 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1433 returns true if a definition of this entity should be provided in
1434 this object file. Callers use this function to determine whether
1435 or not to let the back end know that a definition of DECL is
1436 available in this translation unit. */
1439 decl_needed_p (tree decl)
1441 gcc_assert (TREE_CODE (decl) == VAR_DECL
1442 || TREE_CODE (decl) == FUNCTION_DECL);
1443 /* This function should only be called at the end of the translation
1444 unit. We cannot be sure of whether or not something will be
1445 COMDAT until that point. */
1446 gcc_assert (at_eof);
1448 /* All entities with external linkage that are not COMDAT should be
1449 emitted; they may be referred to from other object files. */
1450 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1452 /* If this entity was used, let the back-end see it; it will decide
1453 whether or not to emit it into the object file. */
1454 if (TREE_USED (decl)
1455 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1456 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1458 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1459 reference to DECL might cause it to be emitted later. */
1463 /* If necessary, write out the vtables for the dynamic class CTYPE.
1464 Returns true if any vtables were emitted. */
1467 maybe_emit_vtables (tree ctype)
1473 /* If the vtables for this class have already been emitted there is
1474 nothing more to do. */
1475 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1476 if (var_finalized_p (primary_vtbl))
1478 /* Ignore dummy vtables made by get_vtable_decl. */
1479 if (TREE_TYPE (primary_vtbl) == void_type_node)
1482 /* On some targets, we cannot determine the key method until the end
1483 of the translation unit -- which is when this function is
1485 if (!targetm.cxx.key_method_may_be_inline ())
1486 determine_key_method (ctype);
1488 /* See if any of the vtables are needed. */
1489 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1491 import_export_decl (vtbl);
1492 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1497 /* If the references to this class' vtables are optimized away,
1498 still emit the appropriate debugging information. See
1500 if (DECL_COMDAT (primary_vtbl)
1501 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1502 note_debug_info_needed (ctype);
1506 /* The ABI requires that we emit all of the vtables if we emit any
1508 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1510 /* Mark entities references from the virtual table as used. */
1511 mark_vtable_entries (vtbl);
1513 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1515 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1517 /* It had better be all done at compile-time. */
1522 DECL_EXTERNAL (vtbl) = 0;
1523 rest_of_decl_compilation (vtbl, 1, 1);
1525 /* Because we're only doing syntax-checking, we'll never end up
1526 actually marking the variable as written. */
1527 if (flag_syntax_only)
1528 TREE_ASM_WRITTEN (vtbl) = 1;
1531 /* Since we're writing out the vtable here, also write the debug
1533 note_debug_info_needed (ctype);
1538 /* A special return value from type_visibility meaning internal
1541 enum { VISIBILITY_STATIC = VISIBILITY_INTERNAL+1 };
1543 /* walk_tree helper function for type_visibility. */
1546 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1548 int *vis_p = (int *)data;
1553 else if (CLASS_TYPE_P (*tp))
1555 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1557 *vis_p = VISIBILITY_STATIC;
1560 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1561 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1566 /* Returns the visibility of TYPE, which is the minimum visibility of its
1570 type_visibility (tree type)
1572 int vis = VISIBILITY_DEFAULT;
1573 walk_tree_without_duplicates (&type, min_vis_r, &vis);
1577 /* Limit the visibility of DECL to VISIBILITY. SPECIFIED is true if the
1578 constraint comes from an attribute or pragma; REASON is the source of
1582 constrain_visibility (tree decl, int visibility, bool specified,
1585 if (visibility == VISIBILITY_STATIC)
1587 TREE_PUBLIC (decl) = 0;
1588 DECL_INTERFACE_KNOWN (decl) = 1;
1589 if (DECL_LANG_SPECIFIC (decl))
1590 DECL_NOT_REALLY_EXTERN (decl) = 1;
1592 else if (visibility > DECL_VISIBILITY (decl))
1594 if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)))
1595 warning (OPT_Wattributes, "%q+D: visibility attribute requests "
1596 "greater visibility than its %s allows", decl, reason);
1597 DECL_VISIBILITY (decl) = visibility;
1598 if (!DECL_VISIBILITY_SPECIFIED (decl))
1599 DECL_VISIBILITY_SPECIFIED (decl) = specified;
1605 /* Constrain the visibility of DECL based on the visbility of its template
1609 constrain_visibility_for_template (tree decl, tree targs)
1611 /* If this is a template instantiation, check the innermost
1612 template args for visibility constraints. The outer template
1613 args are covered by the class check. */
1614 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1616 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1620 tree arg = TREE_VEC_ELT (args, i-1);
1622 vis = type_visibility (arg);
1623 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1626 if (TREE_CODE (arg) == ADDR_EXPR)
1627 arg = TREE_OPERAND (arg, 0);
1628 if (TREE_CODE (arg) == VAR_DECL
1629 || TREE_CODE (arg) == FUNCTION_DECL)
1631 if (! TREE_PUBLIC (arg))
1632 vis = VISIBILITY_STATIC;
1634 vis = DECL_VISIBILITY (arg);
1638 constrain_visibility (decl, vis, false, "template parameter");
1642 /* Like c_determine_visibility, but with additional C++-specific
1645 Function-scope entities can rely on the function's visibility because
1646 it is set in start_preparsed_function.
1648 Class-scope entities cannot rely on the class's visibility until the end
1649 of the enclosing class definition.
1651 Note that because namespaces have multiple independent definitions,
1652 namespace visibility is handled elsewhere using the #pragma visibility
1653 machinery rather than by decorating the namespace declaration.
1655 The goal is for constraints from the type to give a diagnostic, and
1656 other constraints to be applied silently. */
1659 determine_visibility (tree decl)
1661 tree class_type = NULL_TREE;
1664 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1666 /* Only relevant for names with external linkage. */
1667 if (!TREE_PUBLIC (decl))
1670 /* Cloned constructors and destructors get the same visibility as
1671 the underlying function. That should be set up in
1672 maybe_clone_body. */
1673 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1675 if (TREE_CODE (decl) == TYPE_DECL)
1677 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1678 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1679 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1684 else if (DECL_LANG_SPECIFIC (decl))
1685 use_template = DECL_USE_TEMPLATE (decl);
1689 /* Anything that is exported must have default visibility. */
1690 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1691 && lookup_attribute ("dllexport",
1692 TREE_CODE (decl) == TYPE_DECL
1693 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
1694 : DECL_ATTRIBUTES (decl)))
1696 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1697 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1700 /* If DECL is a member of a class, visibility specifiers on the
1701 class can influence the visibility of the DECL. */
1702 if (DECL_CLASS_SCOPE_P (decl))
1703 class_type = DECL_CONTEXT (decl);
1704 else if (TREE_CODE (decl) == VAR_DECL
1705 && DECL_TINFO_P (decl)
1706 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1707 class_type = TREE_TYPE (DECL_NAME (decl));
1710 /* Not a class member. */
1712 /* Virtual tables have DECL_CONTEXT set to their associated class,
1713 so they are automatically handled above. */
1714 gcc_assert (TREE_CODE (decl) != VAR_DECL
1715 || !DECL_VTABLE_OR_VTT_P (decl));
1717 if (DECL_FUNCTION_SCOPE_P (decl))
1719 /* Local statics and classes get the visibility of their
1720 containing function. */
1721 tree fn = DECL_CONTEXT (decl);
1722 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1723 DECL_VISIBILITY_SPECIFIED (decl) = DECL_VISIBILITY_SPECIFIED (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))
1731 /* tinfo visibility is based on the type it's for. */
1732 constrain_visibility
1733 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))),
1736 else if (use_template)
1737 /* Template instantiations and specializations get visibility based
1738 on their template unless they override it with an attribute. */;
1739 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1741 /* Set default visibility to whatever the user supplied with
1742 #pragma GCC visibility or a namespace visibility attribute. */
1743 DECL_VISIBILITY (decl) = default_visibility;
1744 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1750 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1751 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1752 : DECL_TEMPLATE_INFO (decl));
1753 tree args = TI_ARGS (tinfo);
1754 int depth = TMPL_ARGS_DEPTH (args);
1756 /* If the template has explicit visibility and the specialization
1757 doesn't, use the visibility from the template. */
1758 if (!DECL_VISIBILITY_SPECIFIED (decl))
1760 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1761 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1764 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1765 if (args && depth > template_class_depth (class_type))
1766 /* Don't let it have more visibility than its template type
1768 constrain_visibility_for_template (decl, args);
1772 determine_visibility_from_class (decl, class_type);
1774 /* Don't let it have more visibility than its type. */
1775 if (TREE_CODE (decl) != TYPE_DECL)
1776 if (constrain_visibility (decl, type_visibility (TREE_TYPE (decl)),
1778 warning (OPT_Wattributes, "\
1779 %q+D declared with greater visibility than its type",
1782 if (decl_anon_ns_mem_p (decl))
1783 /* Names in an anonymous namespace get internal linkage.
1784 This might change once we implement export. */
1785 constrain_visibility (decl, VISIBILITY_STATIC,
1786 false, "namespace");
1789 /* By default, static data members and function members receive
1790 the visibility of their containing class. */
1793 determine_visibility_from_class (tree decl, tree class_type)
1795 if (visibility_options.inlines_hidden
1796 /* Don't do this for inline templates; specializations might not be
1797 inline, and we don't want them to inherit the hidden
1798 visibility. We'll set it here for all inline instantiations. */
1799 && !processing_template_decl
1800 && ! DECL_VISIBILITY_SPECIFIED (decl)
1801 && TREE_CODE (decl) == FUNCTION_DECL
1802 && DECL_DECLARED_INLINE_P (decl))
1803 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1805 /* The decl can't have more visibility than its class. */
1806 constrain_visibility (decl, CLASSTYPE_VISIBILITY (class_type),
1807 CLASSTYPE_VISIBILITY_SPECIFIED (class_type),
1810 /* Give the target a chance to override the visibility associated
1812 if (TREE_CODE (decl) == VAR_DECL
1813 && (DECL_TINFO_P (decl)
1814 || (DECL_VTABLE_OR_VTT_P (decl)
1815 /* Construction virtual tables are not exported because
1816 they cannot be referred to from other object files;
1817 their name is not standardized by the ABI. */
1818 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1819 && TREE_PUBLIC (decl)
1820 && !DECL_REALLY_EXTERN (decl)
1821 && DECL_VISIBILITY_SPECIFIED (decl)
1822 && (!class_type || !CLASSTYPE_VISIBILITY_SPECIFIED (class_type)))
1823 targetm.cxx.determine_class_data_visibility (decl);
1826 /* Constrain the visibility of a class TYPE based on the visibility of its
1827 field types. Warn if any fields require lesser visibility. */
1830 constrain_class_visibility (tree type)
1832 tree decl = TYPE_MAIN_DECL (type);
1833 tree binfo = TYPE_BINFO (type);
1837 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1838 if (TREE_CODE (t) == FIELD_DECL)
1839 if (constrain_visibility (decl, type_visibility (TREE_TYPE (t)),
1840 false, "field type"))
1841 warning (OPT_Wattributes, "\
1842 %qT declared with greater visibility than the type of its field %qD",
1845 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1846 if (constrain_visibility (decl, type_visibility (TREE_TYPE (t)),
1847 false, "base type"))
1848 warning (OPT_Wattributes, "\
1849 %qT declared with greater visibility than its base %qT",
1850 type, TREE_TYPE (t));
1853 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1854 for DECL has not already been determined, do so now by setting
1855 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1856 function is called entities with vague linkage whose definitions
1857 are available must have TREE_PUBLIC set.
1859 If this function decides to place DECL in COMDAT, it will set
1860 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1861 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1862 callers defer that decision until it is clear that DECL is actually
1866 import_export_decl (tree decl)
1871 tree class_type = NULL_TREE;
1873 if (DECL_INTERFACE_KNOWN (decl))
1876 /* We cannot determine what linkage to give to an entity with vague
1877 linkage until the end of the file. For example, a virtual table
1878 for a class will be defined if and only if the key method is
1879 defined in this translation unit. As a further example, consider
1880 that when compiling a translation unit that uses PCH file with
1881 "-frepo" it would be incorrect to make decisions about what
1882 entities to emit when building the PCH; those decisions must be
1883 delayed until the repository information has been processed. */
1884 gcc_assert (at_eof);
1885 /* Object file linkage for explicit instantiations is handled in
1886 mark_decl_instantiated. For static variables in functions with
1887 vague linkage, maybe_commonize_var is used.
1889 Therefore, the only declarations that should be provided to this
1890 function are those with external linkage that are:
1892 * implicit instantiations of function templates
1896 * implicit instantiations of static data members of class
1903 Furthermore, all entities that reach this point must have a
1904 definition available in this translation unit.
1906 The following assertions check these conditions. */
1907 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1908 || TREE_CODE (decl) == VAR_DECL);
1909 /* Any code that creates entities with TREE_PUBLIC cleared should
1910 also set DECL_INTERFACE_KNOWN. */
1911 gcc_assert (TREE_PUBLIC (decl));
1912 if (TREE_CODE (decl) == FUNCTION_DECL)
1913 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1914 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1915 || DECL_DECLARED_INLINE_P (decl));
1917 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1918 || DECL_VTABLE_OR_VTT_P (decl)
1919 || DECL_TINFO_P (decl));
1920 /* Check that a definition of DECL is available in this translation
1922 gcc_assert (!DECL_REALLY_EXTERN (decl));
1924 /* Assume that DECL will not have COMDAT linkage. */
1926 /* Assume that DECL will not be imported into this translation
1930 /* See if the repository tells us whether or not to emit DECL in
1931 this translation unit. */
1932 emit_p = repo_emit_p (decl);
1935 else if (emit_p == 1)
1937 /* The repository indicates that this entity should be defined
1938 here. Make sure the back end honors that request. */
1939 if (TREE_CODE (decl) == VAR_DECL)
1941 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1942 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1945 FOR_EACH_CLONE (clone, decl)
1946 mark_needed (clone);
1950 /* Output the definition as an ordinary strong definition. */
1951 DECL_EXTERNAL (decl) = 0;
1952 DECL_INTERFACE_KNOWN (decl) = 1;
1957 /* We have already decided what to do with this DECL; there is no
1958 need to check anything further. */
1960 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
1962 class_type = DECL_CONTEXT (decl);
1963 import_export_class (class_type);
1964 if (TYPE_FOR_JAVA (class_type))
1966 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
1967 && CLASSTYPE_INTERFACE_ONLY (class_type))
1969 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
1970 && !CLASSTYPE_USE_TEMPLATE (class_type)
1971 && CLASSTYPE_KEY_METHOD (class_type)
1972 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
1973 /* The ABI requires that all virtual tables be emitted with
1974 COMDAT linkage. However, on systems where COMDAT symbols
1975 don't show up in the table of contents for a static
1976 archive, or on systems without weak symbols (where we
1977 approximate COMDAT linkage by using internal linkage), the
1978 linker will report errors about undefined symbols because
1979 it will not see the virtual table definition. Therefore,
1980 in the case that we know that the virtual table will be
1981 emitted in only one translation unit, we make the virtual
1982 table an ordinary definition with external linkage. */
1983 DECL_EXTERNAL (decl) = 0;
1984 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
1986 /* CLASS_TYPE is being exported from this translation unit,
1987 so DECL should be defined here. */
1988 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
1989 /* If a class is declared in a header with the "extern
1990 template" extension, then it will not be instantiated,
1991 even in translation units that would normally require
1992 it. Often such classes are explicitly instantiated in
1993 one translation unit. Therefore, the explicit
1994 instantiation must be made visible to other translation
1996 DECL_EXTERNAL (decl) = 0;
1999 /* The generic C++ ABI says that class data is always
2000 COMDAT, even if there is a key function. Some
2001 variants (e.g., the ARM EABI) says that class data
2002 only has COMDAT linkage if the class data might be
2003 emitted in more than one translation unit. When the
2004 key method can be inline and is inline, we still have
2005 to arrange for comdat even though
2006 class_data_always_comdat is false. */
2007 if (!CLASSTYPE_KEY_METHOD (class_type)
2008 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2009 || targetm.cxx.class_data_always_comdat ())
2011 /* The ABI requires COMDAT linkage. Normally, we
2012 only emit COMDAT things when they are needed;
2013 make sure that we realize that this entity is
2020 else if (!flag_implicit_templates
2021 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2026 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2028 tree type = TREE_TYPE (DECL_NAME (decl));
2029 if (CLASS_TYPE_P (type))
2032 import_export_class (type);
2033 if (CLASSTYPE_INTERFACE_KNOWN (type)
2034 && TYPE_POLYMORPHIC_P (type)
2035 && CLASSTYPE_INTERFACE_ONLY (type)
2036 /* If -fno-rtti was specified, then we cannot be sure
2037 that RTTI information will be emitted with the
2038 virtual table of the class, so we must emit it
2039 wherever it is used. */
2044 if (CLASSTYPE_INTERFACE_KNOWN (type)
2045 && !CLASSTYPE_INTERFACE_ONLY (type))
2047 comdat_p = (targetm.cxx.class_data_always_comdat ()
2048 || (CLASSTYPE_KEY_METHOD (type)
2049 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2054 DECL_EXTERNAL (decl) = 0;
2064 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2065 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2067 /* DECL is an implicit instantiation of a function or static
2069 if (flag_implicit_templates
2070 || (flag_implicit_inline_templates
2071 && TREE_CODE (decl) == FUNCTION_DECL
2072 && DECL_DECLARED_INLINE_P (decl)))
2075 /* If we are not implicitly generating templates, then mark
2076 this entity as undefined in this translation unit. */
2079 else if (DECL_FUNCTION_MEMBER_P (decl))
2081 if (!DECL_DECLARED_INLINE_P (decl))
2083 tree ctype = DECL_CONTEXT (decl);
2084 import_export_class (ctype);
2085 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2087 DECL_NOT_REALLY_EXTERN (decl)
2088 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2089 || (DECL_DECLARED_INLINE_P (decl)
2090 && ! flag_implement_inlines
2091 && !DECL_VINDEX (decl)));
2093 if (!DECL_NOT_REALLY_EXTERN (decl))
2094 DECL_EXTERNAL (decl) = 1;
2096 /* Always make artificials weak. */
2097 if (DECL_ARTIFICIAL (decl) && flag_weak)
2100 maybe_make_one_only (decl);
2111 /* If we are importing DECL into this translation unit, mark is
2112 an undefined here. */
2113 DECL_EXTERNAL (decl) = 1;
2114 DECL_NOT_REALLY_EXTERN (decl) = 0;
2118 /* If we decided to put DECL in COMDAT, mark it accordingly at
2120 comdat_linkage (decl);
2123 DECL_INTERFACE_KNOWN (decl) = 1;
2126 /* Return an expression that performs the destruction of DECL, which
2127 must be a VAR_DECL whose type has a non-trivial destructor, or is
2128 an array whose (innermost) elements have a non-trivial destructor. */
2131 build_cleanup (tree decl)
2134 tree type = TREE_TYPE (decl);
2136 /* This function should only be called for declarations that really
2137 require cleanups. */
2138 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2140 /* Treat all objects with destructors as used; the destructor may do
2141 something substantive. */
2144 if (TREE_CODE (type) == ARRAY_TYPE)
2148 cxx_mark_addressable (decl);
2149 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
2151 temp = build_delete (TREE_TYPE (temp), temp,
2152 sfk_complete_destructor,
2153 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2157 /* Returns the initialization guard variable for the variable DECL,
2158 which has static storage duration. */
2161 get_guard (tree decl)
2166 sname = mangle_guard_variable (decl);
2167 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2172 /* We use a type that is big enough to contain a mutex as well
2173 as an integer counter. */
2174 guard_type = targetm.cxx.guard_type ();
2175 guard = build_decl (VAR_DECL, sname, guard_type);
2177 /* The guard should have the same linkage as what it guards. */
2178 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2179 TREE_STATIC (guard) = TREE_STATIC (decl);
2180 DECL_COMMON (guard) = DECL_COMMON (decl);
2181 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2182 if (TREE_PUBLIC (decl))
2183 DECL_WEAK (guard) = DECL_WEAK (decl);
2185 DECL_ARTIFICIAL (guard) = 1;
2186 DECL_IGNORED_P (guard) = 1;
2187 TREE_USED (guard) = 1;
2188 pushdecl_top_level_and_finish (guard, NULL_TREE);
2193 /* Return those bits of the GUARD variable that should be set when the
2194 guarded entity is actually initialized. */
2197 get_guard_bits (tree guard)
2199 if (!targetm.cxx.guard_mask_bit ())
2201 /* We only set the first byte of the guard, in order to leave room
2202 for a mutex in the high-order bits. */
2203 guard = build1 (ADDR_EXPR,
2204 build_pointer_type (TREE_TYPE (guard)),
2206 guard = build1 (NOP_EXPR,
2207 build_pointer_type (char_type_node),
2209 guard = build1 (INDIRECT_REF, char_type_node, guard);
2215 /* Return an expression which determines whether or not the GUARD
2216 variable has already been initialized. */
2219 get_guard_cond (tree guard)
2223 /* Check to see if the GUARD is zero. */
2224 guard = get_guard_bits (guard);
2226 /* Mask off all but the low bit. */
2227 if (targetm.cxx.guard_mask_bit ())
2229 guard_value = integer_one_node;
2230 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2231 guard_value = convert (TREE_TYPE (guard), guard_value);
2232 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2235 guard_value = integer_zero_node;
2236 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2237 guard_value = convert (TREE_TYPE (guard), guard_value);
2238 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2241 /* Return an expression which sets the GUARD variable, indicating that
2242 the variable being guarded has been initialized. */
2245 set_guard (tree guard)
2249 /* Set the GUARD to one. */
2250 guard = get_guard_bits (guard);
2251 guard_init = integer_one_node;
2252 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2253 guard_init = convert (TREE_TYPE (guard), guard_init);
2254 return build_modify_expr (guard, NOP_EXPR, guard_init);
2257 /* Start the process of running a particular set of global constructors
2258 or destructors. Subroutine of do_[cd]tors. */
2261 start_objects (int method_type, int initp)
2267 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2269 if (initp != DEFAULT_INIT_PRIORITY)
2279 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2282 sprintf (type, "%c", method_type);
2284 fndecl = build_lang_decl (FUNCTION_DECL,
2285 get_file_function_name_long (type),
2286 build_function_type (void_type_node,
2288 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2290 /* It can be a static function as long as collect2 does not have
2291 to scan the object file to find its ctor/dtor routine. */
2292 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2294 /* Mark this declaration as used to avoid spurious warnings. */
2295 TREE_USED (current_function_decl) = 1;
2297 /* Mark this function as a global constructor or destructor. */
2298 if (method_type == 'I')
2299 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2301 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2302 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2304 body = begin_compound_stmt (BCS_FN_BODY);
2306 /* We cannot allow these functions to be elided, even if they do not
2307 have external linkage. And, there's no point in deferring
2308 compilation of these functions; they're all going to have to be
2310 DECL_INLINE (current_function_decl) = 0;
2311 DECL_UNINLINABLE (current_function_decl) = 1;
2316 /* Finish the process of running a particular set of global constructors
2317 or destructors. Subroutine of do_[cd]tors. */
2320 finish_objects (int method_type, int initp, tree body)
2325 finish_compound_stmt (body);
2326 fn = finish_function (0);
2327 expand_or_defer_fn (fn);
2329 /* When only doing semantic analysis, and no RTL generation, we
2330 can't call functions that directly emit assembly code; there is
2331 no assembly file in which to put the code. */
2332 if (flag_syntax_only)
2335 if (targetm.have_ctors_dtors)
2337 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2338 cgraph_mark_needed_node (cgraph_node (fn));
2339 if (method_type == 'I')
2340 (* targetm.asm_out.constructor) (fnsym, initp);
2342 (* targetm.asm_out.destructor) (fnsym, initp);
2346 /* The names of the parameters to the function created to handle
2347 initializations and destructions for objects with static storage
2349 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2350 #define PRIORITY_IDENTIFIER "__priority"
2352 /* The name of the function we create to handle initializations and
2353 destructions for objects with static storage duration. */
2354 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2356 /* The declaration for the __INITIALIZE_P argument. */
2357 static GTY(()) tree initialize_p_decl;
2359 /* The declaration for the __PRIORITY argument. */
2360 static GTY(()) tree priority_decl;
2362 /* The declaration for the static storage duration function. */
2363 static GTY(()) tree ssdf_decl;
2365 /* All the static storage duration functions created in this
2366 translation unit. */
2367 static GTY(()) VEC(tree,gc) *ssdf_decls;
2369 /* A map from priority levels to information about that priority
2370 level. There may be many such levels, so efficient lookup is
2372 static splay_tree priority_info_map;
2374 /* Begins the generation of the function that will handle all
2375 initialization and destruction of objects with static storage
2376 duration. The function generated takes two parameters of type
2377 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2378 nonzero, it performs initializations. Otherwise, it performs
2379 destructions. It only performs those initializations or
2380 destructions with the indicated __PRIORITY. The generated function
2383 It is assumed that this function will only be called once per
2384 translation unit. */
2387 start_static_storage_duration_function (unsigned count)
2392 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2394 /* Create the identifier for this function. It will be of the form
2395 SSDF_IDENTIFIER_<number>. */
2396 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2398 /* Create the parameters. */
2399 parm_types = void_list_node;
2400 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2401 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2402 type = build_function_type (void_type_node, parm_types);
2404 /* Create the FUNCTION_DECL itself. */
2405 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2406 get_identifier (id),
2408 TREE_PUBLIC (ssdf_decl) = 0;
2409 DECL_ARTIFICIAL (ssdf_decl) = 1;
2411 /* Put this function in the list of functions to be called from the
2412 static constructors and destructors. */
2415 ssdf_decls = VEC_alloc (tree, gc, 32);
2417 /* Take this opportunity to initialize the map from priority
2418 numbers to information about that priority level. */
2419 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2420 /*delete_key_fn=*/0,
2421 /*delete_value_fn=*/
2422 (splay_tree_delete_value_fn) &free);
2424 /* We always need to generate functions for the
2425 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2426 priorities later, we'll be sure to find the
2427 DEFAULT_INIT_PRIORITY. */
2428 get_priority_info (DEFAULT_INIT_PRIORITY);
2431 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2433 /* Create the argument list. */
2434 initialize_p_decl = cp_build_parm_decl
2435 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2436 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2437 TREE_USED (initialize_p_decl) = 1;
2438 priority_decl = cp_build_parm_decl
2439 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2440 DECL_CONTEXT (priority_decl) = ssdf_decl;
2441 TREE_USED (priority_decl) = 1;
2443 TREE_CHAIN (initialize_p_decl) = priority_decl;
2444 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2446 /* Put the function in the global scope. */
2447 pushdecl (ssdf_decl);
2449 /* Start the function itself. This is equivalent to declaring the
2452 static void __ssdf (int __initialize_p, init __priority_p);
2454 It is static because we only need to call this function from the
2455 various constructor and destructor functions for this module. */
2456 start_preparsed_function (ssdf_decl,
2457 /*attrs=*/NULL_TREE,
2460 /* Set up the scope of the outermost block in the function. */
2461 body = begin_compound_stmt (BCS_FN_BODY);
2463 /* This function must not be deferred because we are depending on
2464 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2465 DECL_INLINE (ssdf_decl) = 0;
2466 DECL_UNINLINABLE (ssdf_decl) = 1;
2471 /* Finish the generation of the function which performs initialization
2472 and destruction of objects with static storage duration. After
2473 this point, no more such objects can be created. */
2476 finish_static_storage_duration_function (tree body)
2478 /* Close out the function. */
2479 finish_compound_stmt (body);
2480 expand_or_defer_fn (finish_function (0));
2483 /* Return the information about the indicated PRIORITY level. If no
2484 code to handle this level has yet been generated, generate the
2485 appropriate prologue. */
2487 static priority_info
2488 get_priority_info (int priority)
2493 n = splay_tree_lookup (priority_info_map,
2494 (splay_tree_key) priority);
2497 /* Create a new priority information structure, and insert it
2499 pi = XNEW (struct priority_info_s);
2500 pi->initializations_p = 0;
2501 pi->destructions_p = 0;
2502 splay_tree_insert (priority_info_map,
2503 (splay_tree_key) priority,
2504 (splay_tree_value) pi);
2507 pi = (priority_info) n->value;
2512 /* The effective initialization priority of a DECL. */
2514 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2515 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2516 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2518 /* Whether a DECL needs a guard to protect it against multiple
2521 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2522 || DECL_ONE_ONLY (decl) \
2523 || DECL_WEAK (decl)))
2525 /* Set up to handle the initialization or destruction of DECL. If
2526 INITP is nonzero, we are initializing the variable. Otherwise, we
2527 are destroying it. */
2530 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2532 tree guard_if_stmt = NULL_TREE;
2535 /* If we are supposed to destruct and there's a trivial destructor,
2536 nothing has to be done. */
2538 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2541 /* Trick the compiler into thinking we are at the file and line
2542 where DECL was declared so that error-messages make sense, and so
2543 that the debugger will show somewhat sensible file and line
2545 input_location = DECL_SOURCE_LOCATION (decl);
2551 Access control for implicit calls to the constructors,
2552 the conversion functions, or the destructor called to
2553 create and destroy a static data member is performed as
2554 if these calls appeared in the scope of the member's
2557 we pretend we are in a static member function of the class of
2558 which the DECL is a member. */
2559 if (member_p (decl))
2561 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2562 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2565 /* Assume we don't need a guard. */
2567 /* We need a guard if this is an object with external linkage that
2568 might be initialized in more than one place. (For example, a
2569 static data member of a template, when the data member requires
2571 if (NEEDS_GUARD_P (decl))
2575 guard = get_guard (decl);
2577 /* When using __cxa_atexit, we just check the GUARD as we would
2578 for a local static. */
2579 if (flag_use_cxa_atexit)
2581 /* When using __cxa_atexit, we never try to destroy
2582 anything from a static destructor. */
2584 guard_cond = get_guard_cond (guard);
2586 /* If we don't have __cxa_atexit, then we will be running
2587 destructors from .fini sections, or their equivalents. So,
2588 we need to know how many times we've tried to initialize this
2589 object. We do initializations only if the GUARD is zero,
2590 i.e., if we are the first to initialize the variable. We do
2591 destructions only if the GUARD is one, i.e., if we are the
2592 last to destroy the variable. */
2595 = cp_build_binary_op (EQ_EXPR,
2596 build_unary_op (PREINCREMENT_EXPR,
2602 = cp_build_binary_op (EQ_EXPR,
2603 build_unary_op (PREDECREMENT_EXPR,
2608 guard_if_stmt = begin_if_stmt ();
2609 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2613 /* If we're using __cxa_atexit, we have not already set the GUARD,
2614 so we must do so now. */
2615 if (guard && initp && flag_use_cxa_atexit)
2616 finish_expr_stmt (set_guard (guard));
2618 /* Perform the initialization or destruction. */
2622 finish_expr_stmt (init);
2624 /* If we're using __cxa_atexit, register a function that calls the
2625 destructor for the object. */
2626 if (flag_use_cxa_atexit)
2627 finish_expr_stmt (register_dtor_fn (decl));
2630 finish_expr_stmt (build_cleanup (decl));
2632 /* Finish the guard if-stmt, if necessary. */
2635 finish_then_clause (guard_if_stmt);
2636 finish_if_stmt (guard_if_stmt);
2639 /* Now that we're done with DECL we don't need to pretend to be a
2640 member of its class any longer. */
2641 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2642 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2645 /* Generate code to do the initialization or destruction of the decls in VARS,
2646 a TREE_LIST of VAR_DECL with static storage duration.
2647 Whether initialization or destruction is performed is specified by INITP. */
2650 do_static_initialization_or_destruction (tree vars, bool initp)
2652 tree node, init_if_stmt, cond;
2654 /* Build the outer if-stmt to check for initialization or destruction. */
2655 init_if_stmt = begin_if_stmt ();
2656 cond = initp ? integer_one_node : integer_zero_node;
2657 cond = cp_build_binary_op (EQ_EXPR,
2660 finish_if_stmt_cond (cond, init_if_stmt);
2664 tree decl = TREE_VALUE (node);
2665 tree priority_if_stmt;
2669 /* If we don't need a destructor, there's nothing to do. Avoid
2670 creating a possibly empty if-stmt. */
2671 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2673 node = TREE_CHAIN (node);
2677 /* Remember that we had an initialization or finalization at this
2679 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2680 pi = get_priority_info (priority);
2682 pi->initializations_p = 1;
2684 pi->destructions_p = 1;
2686 /* Conditionalize this initialization on being in the right priority
2687 and being initializing/finalizing appropriately. */
2688 priority_if_stmt = begin_if_stmt ();
2689 cond = cp_build_binary_op (EQ_EXPR,
2691 build_int_cst (NULL_TREE, priority));
2692 finish_if_stmt_cond (cond, priority_if_stmt);
2694 /* Process initializers with same priority. */
2696 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2697 node = TREE_CHAIN (node))
2698 /* Do one initialization or destruction. */
2699 one_static_initialization_or_destruction (TREE_VALUE (node),
2700 TREE_PURPOSE (node), initp);
2702 /* Finish up the priority if-stmt body. */
2703 finish_then_clause (priority_if_stmt);
2704 finish_if_stmt (priority_if_stmt);
2708 /* Finish up the init/destruct if-stmt body. */
2709 finish_then_clause (init_if_stmt);
2710 finish_if_stmt (init_if_stmt);
2713 /* VARS is a list of variables with static storage duration which may
2714 need initialization and/or finalization. Remove those variables
2715 that don't really need to be initialized or finalized, and return
2716 the resulting list. The order in which the variables appear in
2717 VARS is in reverse order of the order in which they should actually
2718 be initialized. The list we return is in the unreversed order;
2719 i.e., the first variable should be initialized first. */
2722 prune_vars_needing_no_initialization (tree *vars)
2725 tree result = NULL_TREE;
2730 tree decl = TREE_VALUE (t);
2731 tree init = TREE_PURPOSE (t);
2733 /* Deal gracefully with error. */
2734 if (decl == error_mark_node)
2736 var = &TREE_CHAIN (t);
2740 /* The only things that can be initialized are variables. */
2741 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2743 /* If this object is not defined, we don't need to do anything
2745 if (DECL_EXTERNAL (decl))
2747 var = &TREE_CHAIN (t);
2751 /* Also, if the initializer already contains errors, we can bail
2753 if (init && TREE_CODE (init) == TREE_LIST
2754 && value_member (error_mark_node, init))
2756 var = &TREE_CHAIN (t);
2760 /* This variable is going to need initialization and/or
2761 finalization, so we add it to the list. */
2762 *var = TREE_CHAIN (t);
2763 TREE_CHAIN (t) = result;
2770 /* Make sure we have told the back end about all the variables in
2774 write_out_vars (tree vars)
2778 for (v = vars; v; v = TREE_CHAIN (v))
2780 tree var = TREE_VALUE (v);
2781 if (!var_finalized_p (var))
2783 import_export_decl (var);
2784 rest_of_decl_compilation (var, 1, 1);
2789 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2790 (otherwise) that will initialize all gobal objects with static
2791 storage duration having the indicated PRIORITY. */
2794 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2803 input_location = *locus;
2804 #ifdef USE_MAPPED_LOCATION
2810 /* We use `I' to indicate initialization and `D' to indicate
2812 function_key = constructor_p ? 'I' : 'D';
2814 /* We emit the function lazily, to avoid generating empty
2815 global constructors and destructors. */
2818 /* For Objective-C++, we may need to initialize metadata found in this module.
2819 This must be done _before_ any other static initializations. */
2820 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2821 && constructor_p && objc_static_init_needed_p ())
2823 body = start_objects (function_key, priority);
2824 static_ctors = objc_generate_static_init_call (static_ctors);
2827 /* Call the static storage duration function with appropriate
2829 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2831 /* Calls to pure or const functions will expand to nothing. */
2832 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2835 body = start_objects (function_key, priority);
2837 arguments = tree_cons (NULL_TREE,
2838 build_int_cst (NULL_TREE, priority),
2840 arguments = tree_cons (NULL_TREE,
2841 build_int_cst (NULL_TREE, constructor_p),
2843 finish_expr_stmt (build_function_call (fndecl, arguments));
2847 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2848 calls to any functions marked with attributes indicating that
2849 they should be called at initialization- or destruction-time. */
2850 if (priority == DEFAULT_INIT_PRIORITY)
2854 for (fns = constructor_p ? static_ctors : static_dtors;
2856 fns = TREE_CHAIN (fns))
2858 fndecl = TREE_VALUE (fns);
2860 /* Calls to pure/const functions will expand to nothing. */
2861 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2864 body = start_objects (function_key, priority);
2865 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2870 /* Close out the function. */
2872 finish_objects (function_key, priority, body);
2875 /* Generate constructor and destructor functions for the priority
2879 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2881 location_t *locus = (location_t *) data;
2882 int priority = (int) n->key;
2883 priority_info pi = (priority_info) n->value;
2885 /* Generate the functions themselves, but only if they are really
2887 if (pi->initializations_p
2888 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2889 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2890 if (pi->destructions_p
2891 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2892 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2894 /* Keep iterating. */
2898 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2899 decls referenced from frontend specific constructs; it will be called
2900 only for language-specific tree nodes.
2902 Here we must deal with member pointers. */
2905 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2906 tree from ATTRIBUTE_UNUSED)
2910 switch (TREE_CODE (t))
2913 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2914 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2917 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2918 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2921 if (DECL_VTABLE_OR_VTT_P (t))
2923 /* The ABI requires that all virtual tables be emitted
2924 whenever one of them is. */
2926 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2928 vtbl = TREE_CHAIN (vtbl))
2929 mark_decl_referenced (vtbl);
2931 else if (DECL_CONTEXT (t)
2932 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2933 /* If we need a static variable in a function, then we
2934 need the containing function. */
2935 mark_decl_referenced (DECL_CONTEXT (t));
2944 /* Java requires that we be able to reference a local address for a
2945 method, and not be confused by PLT entries. If hidden aliases are
2946 supported, emit one for each java function that we've emitted. */
2949 build_java_method_aliases (void)
2951 struct cgraph_node *node;
2953 #ifndef HAVE_GAS_HIDDEN
2957 for (node = cgraph_nodes; node ; node = node->next)
2959 tree fndecl = node->decl;
2961 if (TREE_ASM_WRITTEN (fndecl)
2962 && DECL_CONTEXT (fndecl)
2963 && TYPE_P (DECL_CONTEXT (fndecl))
2964 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2965 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
2967 /* Mangle the name in a predictable way; we need to reference
2968 this from a java compiled object file. */
2969 tree oid, nid, alias;
2973 oid = DECL_ASSEMBLER_NAME (fndecl);
2974 oname = IDENTIFIER_POINTER (oid);
2975 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
2976 nname = ACONCAT (("_ZGA", oname+2, NULL));
2977 nid = get_identifier (nname);
2979 alias = make_alias_for (fndecl, nid);
2980 TREE_PUBLIC (alias) = 1;
2981 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
2983 assemble_alias (alias, oid);
2988 /* This routine is called from the last rule in yyparse ().
2989 Its job is to create all the code needed to initialize and
2990 destroy the global aggregates. We do the destruction
2991 first, since that way we only need to reverse the decls once. */
2994 cp_finish_file (void)
3000 unsigned ssdf_count = 0;
3004 locus = input_location;
3007 /* Bad parse errors. Just forget about it. */
3008 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3012 c_common_write_pch ();
3014 #ifdef USE_MAPPED_LOCATION
3017 /* Otherwise, GDB can get confused, because in only knows
3018 about source for LINENO-1 lines. */
3022 /* We now have to write out all the stuff we put off writing out.
3025 o Template specializations that we have not yet instantiated,
3026 but which are needed.
3027 o Initialization and destruction for non-local objects with
3028 static storage duration. (Local objects with static storage
3029 duration are initialized when their scope is first entered,
3030 and are cleaned up via atexit.)
3031 o Virtual function tables.
3033 All of these may cause others to be needed. For example,
3034 instantiating one function may cause another to be needed, and
3035 generating the initializer for an object may cause templates to be
3036 instantiated, etc., etc. */
3038 timevar_push (TV_VARCONST);
3040 emit_support_tinfos ();
3049 /* If there are templates that we've put off instantiating, do
3051 instantiate_pending_templates (retries);
3054 /* Write out virtual tables as required. Note that writing out
3055 the virtual table for a template class may cause the
3056 instantiation of members of that class. If we write out
3057 vtables then we remove the class from our list so we don't
3058 have to look at it again. */
3060 while (keyed_classes != NULL_TREE
3061 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3064 keyed_classes = TREE_CHAIN (keyed_classes);
3070 tree next = TREE_CHAIN (t);
3074 if (maybe_emit_vtables (TREE_VALUE (next)))
3077 TREE_CHAIN (t) = TREE_CHAIN (next);
3082 next = TREE_CHAIN (t);
3086 /* Write out needed type info variables. We have to be careful
3087 looping through unemitted decls, because emit_tinfo_decl may
3088 cause other variables to be needed. New elements will be
3089 appended, and we remove from the vector those that actually
3091 for (i = VEC_length (tree, unemitted_tinfo_decls);
3092 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3093 if (emit_tinfo_decl (t))
3096 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3099 /* The list of objects with static storage duration is built up
3100 in reverse order. We clear STATIC_AGGREGATES so that any new
3101 aggregates added during the initialization of these will be
3102 initialized in the correct order when we next come around the
3104 vars = prune_vars_needing_no_initialization (&static_aggregates);
3108 /* We need to start a new initialization function each time
3109 through the loop. That's because we need to know which
3110 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3111 isn't computed until a function is finished, and written
3112 out. That's a deficiency in the back-end. When this is
3113 fixed, these initialization functions could all become
3114 inline, with resulting performance improvements. */
3117 /* Set the line and file, so that it is obviously not from
3119 input_location = locus;
3120 ssdf_body = start_static_storage_duration_function (ssdf_count);
3122 /* Make sure the back end knows about all the variables. */
3123 write_out_vars (vars);
3125 /* First generate code to do all the initializations. */
3127 do_static_initialization_or_destruction (vars, /*initp=*/true);
3129 /* Then, generate code to do all the destructions. Do these
3130 in reverse order so that the most recently constructed
3131 variable is the first destroyed. If we're using
3132 __cxa_atexit, then we don't need to do this; functions
3133 were registered at initialization time to destroy the
3135 if (!flag_use_cxa_atexit && vars)
3137 vars = nreverse (vars);
3138 do_static_initialization_or_destruction (vars, /*initp=*/false);
3143 /* Finish up the static storage duration function for this
3145 input_location = locus;
3146 finish_static_storage_duration_function (ssdf_body);
3148 /* All those initializations and finalizations might cause
3149 us to need more inline functions, more template
3150 instantiations, etc. */
3153 #ifdef USE_MAPPED_LOCATION
3160 /* Go through the set of inline functions whose bodies have not
3161 been emitted yet. If out-of-line copies of these functions
3162 are required, emit them. */
3163 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3165 /* Does it need synthesizing? */
3166 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3167 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3169 /* Even though we're already at the top-level, we push
3170 there again. That way, when we pop back a few lines
3171 hence, all of our state is restored. Otherwise,
3172 finish_function doesn't clean things up, and we end
3173 up with CURRENT_FUNCTION_DECL set. */
3174 push_to_top_level ();
3175 /* The decl's location will mark where it was first
3176 needed. Save that so synthesize method can indicate
3177 where it was needed from, in case of error */
3178 input_location = DECL_SOURCE_LOCATION (decl);
3179 synthesize_method (decl);
3180 pop_from_top_level ();
3184 if (!DECL_SAVED_TREE (decl))
3187 /* We lie to the back-end, pretending that some functions
3188 are not defined when they really are. This keeps these
3189 functions from being put out unnecessarily. But, we must
3190 stop lying when the functions are referenced, or if they
3191 are not comdat since they need to be put out now. If
3192 DECL_INTERFACE_KNOWN, then we have already set
3193 DECL_EXTERNAL appropriately, so there's no need to check
3194 again, and we do not want to clear DECL_EXTERNAL if a
3195 previous call to import_export_decl set it.
3197 This is done in a separate for cycle, because if some
3198 deferred function is contained in another deferred
3199 function later in deferred_fns varray,
3200 rest_of_compilation would skip this function and we
3201 really cannot expand the same function twice. */
3202 import_export_decl (decl);
3203 if (DECL_NOT_REALLY_EXTERN (decl)
3204 && DECL_INITIAL (decl)
3205 && decl_needed_p (decl))
3206 DECL_EXTERNAL (decl) = 0;
3208 /* If we're going to need to write this function out, and
3209 there's already a body for it, create RTL for it now.
3210 (There might be no body if this is a method we haven't
3211 gotten around to synthesizing yet.) */
3212 if (!DECL_EXTERNAL (decl)
3213 && decl_needed_p (decl)
3214 && !TREE_ASM_WRITTEN (decl)
3215 && !cgraph_node (decl)->local.finalized)
3217 /* We will output the function; no longer consider it in this
3219 DECL_DEFER_OUTPUT (decl) = 0;
3220 /* Generate RTL for this function now that we know we
3222 expand_or_defer_fn (decl);
3223 /* If we're compiling -fsyntax-only pretend that this
3224 function has been written out so that we don't try to
3226 if (flag_syntax_only)
3227 TREE_ASM_WRITTEN (decl) = 1;
3232 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3235 /* Static data members are just like namespace-scope globals. */
3236 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3238 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3240 import_export_decl (decl);
3241 /* If this static data member is needed, provide it to the
3243 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3244 DECL_EXTERNAL (decl) = 0;
3246 if (VEC_length (tree, pending_statics) != 0
3247 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3248 VEC_length (tree, pending_statics)))
3255 /* All used inline functions must have a definition at this point. */
3256 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3258 if (/* Check online inline functions that were actually used. */
3259 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3260 /* If the definition actually was available here, then the
3261 fact that the function was not defined merely represents
3262 that for some reason (use of a template repository,
3263 #pragma interface, etc.) we decided not to emit the
3265 && !DECL_INITIAL (decl)
3266 /* An explicit instantiation can be used to specify
3267 that the body is in another unit. It will have
3268 already verified there was a definition. */
3269 && !DECL_EXPLICIT_INSTANTIATION (decl))
3271 warning (0, "inline function %q+D used but never defined", decl);
3272 /* Avoid a duplicate warning from check_global_declaration_1. */
3273 TREE_NO_WARNING (decl) = 1;
3277 /* We give C linkage to static constructors and destructors. */
3278 push_lang_context (lang_name_c);
3280 /* Generate initialization and destruction functions for all
3281 priorities for which they are required. */
3282 if (priority_info_map)
3283 splay_tree_foreach (priority_info_map,
3284 generate_ctor_and_dtor_functions_for_priority,
3288 /* If we have a ctor or this is obj-c++ and we need a static init,
3289 call generate_ctor_or_dtor_function. */
3290 if (static_ctors || (c_dialect_objc () && objc_static_init_needed_p ()))
3291 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3292 DEFAULT_INIT_PRIORITY, &locus);
3294 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3295 DEFAULT_INIT_PRIORITY, &locus);
3298 /* We're done with the splay-tree now. */
3299 if (priority_info_map)
3300 splay_tree_delete (priority_info_map);
3302 /* Generate any missing aliases. */
3303 maybe_apply_pending_pragma_weaks ();
3305 /* We're done with static constructors, so we can go back to "C++"
3307 pop_lang_context ();
3309 cgraph_finalize_compilation_unit ();
3312 /* Now, issue warnings about static, but not defined, functions,
3313 etc., and emit debugging information. */
3314 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3315 if (VEC_length (tree, pending_statics) != 0)
3317 check_global_declarations (VEC_address (tree, pending_statics),
3318 VEC_length (tree, pending_statics));
3319 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3320 VEC_length (tree, pending_statics));
3323 /* Generate hidden aliases for Java. */
3324 build_java_method_aliases ();
3328 /* The entire file is now complete. If requested, dump everything
3332 FILE *stream = dump_begin (TDI_tu, &flags);
3336 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3337 dump_end (TDI_tu, stream);
3341 timevar_pop (TV_VARCONST);
3343 if (flag_detailed_statistics)
3345 dump_tree_statistics ();
3346 dump_time_statistics ();
3348 input_location = locus;
3350 #ifdef ENABLE_CHECKING
3351 validate_conversion_obstack ();
3352 #endif /* ENABLE_CHECKING */
3355 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3356 function to call in parse-tree form; it has not yet been
3357 semantically analyzed. ARGS are the arguments to the function.
3358 They have already been semantically analyzed. */
3361 build_offset_ref_call_from_tree (tree fn, tree args)
3370 object = TREE_OPERAND (fn, 0);
3372 if (processing_template_decl)
3374 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3375 || TREE_CODE (fn) == MEMBER_REF);
3376 if (type_dependent_expression_p (fn)
3377 || any_type_dependent_arguments_p (args))
3378 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3380 /* Transform the arguments and add the implicit "this"
3381 parameter. That must be done before the FN is transformed
3382 because we depend on the form of FN. */
3383 args = build_non_dependent_args (args);
3384 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3385 object = build_unary_op (ADDR_EXPR, object, 0);
3386 object = build_non_dependent_expr (object);
3387 args = tree_cons (NULL_TREE, object, args);
3388 /* Now that the arguments are done, transform FN. */
3389 fn = build_non_dependent_expr (fn);
3392 /* A qualified name corresponding to a bound pointer-to-member is
3393 represented as an OFFSET_REF:
3395 struct B { void g(); };
3397 void B::g() { (this->*p)(); } */
3398 if (TREE_CODE (fn) == OFFSET_REF)
3400 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3401 fn = TREE_OPERAND (fn, 1);
3402 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3403 args = tree_cons (NULL_TREE, object_addr, args);
3406 expr = build_function_call (fn, args);
3407 if (processing_template_decl && expr != error_mark_node)
3408 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3414 check_default_args (tree x)
3416 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3417 bool saw_def = false;
3418 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3419 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3421 if (TREE_PURPOSE (arg))
3425 error ("default argument missing for parameter %P of %q+#D", i, x);
3426 TREE_PURPOSE (arg) = error_mark_node;
3431 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3432 If DECL is a specialization or implicitly declared class member,
3433 generate the actual definition. */
3436 mark_used (tree decl)
3438 HOST_WIDE_INT saved_processing_template_decl = 0;
3440 /* If DECL is a BASELINK for a single function, then treat it just
3441 like the DECL for the function. Otherwise, if the BASELINK is
3442 for an overloaded function, we don't know which function was
3443 actually used until after overload resolution. */
3444 if (TREE_CODE (decl) == BASELINK)
3446 decl = BASELINK_FUNCTIONS (decl);
3447 if (really_overloaded_fn (decl))
3449 decl = OVL_CURRENT (decl);
3452 TREE_USED (decl) = 1;
3453 /* If we don't need a value, then we don't need to synthesize DECL. */
3454 if (skip_evaluation)
3456 /* Normally, we can wait until instantiation-time to synthesize
3457 DECL. However, if DECL is a static data member initialized with
3458 a constant, we need the value right now because a reference to
3459 such a data member is not value-dependent. */
3460 if (TREE_CODE (decl) == VAR_DECL
3461 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3462 && DECL_CLASS_SCOPE_P (decl))
3464 /* Don't try to instantiate members of dependent types. We
3465 cannot just use dependent_type_p here because this function
3466 may be called from fold_non_dependent_expr, and then we may
3467 see dependent types, even though processing_template_decl
3469 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3470 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3472 /* Pretend that we are not in a template, even if we are, so
3473 that the static data member initializer will be processed. */
3474 saved_processing_template_decl = processing_template_decl;
3475 processing_template_decl = 0;
3478 if (processing_template_decl)
3481 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3482 && !TREE_ASM_WRITTEN (decl))
3483 /* Remember it, so we can check it was defined. */
3485 if (DECL_DEFERRED_FN (decl))
3488 /* Remember the current location for a function we will end up
3489 synthesizing. Then we can inform the user where it was
3490 required in the case of error. */
3491 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3492 && !DECL_THUNK_P (decl))
3493 DECL_SOURCE_LOCATION (decl) = input_location;
3495 note_vague_linkage_fn (decl);
3498 assemble_external (decl);
3500 /* Is it a synthesized method that needs to be synthesized? */
3501 if (TREE_CODE (decl) == FUNCTION_DECL
3502 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3503 && DECL_ARTIFICIAL (decl)
3504 && !DECL_THUNK_P (decl)
3505 && ! DECL_INITIAL (decl)
3506 /* Kludge: don't synthesize for default args. Unfortunately this
3507 rules out initializers of namespace-scoped objects too, but
3508 it's sort-of ok if the implicit ctor or dtor decl keeps
3509 pointing to the class location. */
3510 && current_function_decl)
3512 synthesize_method (decl);
3513 /* If we've already synthesized the method we don't need to
3514 do the instantiation test below. */
3516 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3517 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3518 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3519 || (TREE_CODE (decl) == FUNCTION_DECL
3520 && DECL_INLINE (DECL_TEMPLATE_RESULT
3521 (template_for_substitution (decl))))
3522 /* We need to instantiate static data members so that there
3523 initializers are available in integral constant
3525 || (TREE_CODE (decl) == VAR_DECL
3526 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3527 /* If this is a function or variable that is an instance of some
3528 template, we now know that we will need to actually do the
3529 instantiation. We check that DECL is not an explicit
3530 instantiation because that is not checked in instantiate_decl.
3532 We put off instantiating functions in order to improve compile
3533 times. Maintaining a stack of active functions is expensive,
3534 and the inliner knows to instantiate any functions it might
3535 need. Therefore, we always try to defer instantiation. */
3536 instantiate_decl (decl, /*defer_ok=*/true,
3537 /*expl_inst_class_mem_p=*/false);
3539 processing_template_decl = saved_processing_template_decl;
3542 #include "gt-cp-decl2.h"