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, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
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 #include "pointer-set.h"
57 extern cpp_reader *parse_in;
59 /* This structure contains information about the initializations
60 and/or destructions required for a particular priority level. */
61 typedef struct priority_info_s {
62 /* Nonzero if there have been any initializations at this priority
63 throughout the translation unit. */
64 int initializations_p;
65 /* Nonzero if there have been any destructions at this priority
66 throughout the translation unit. */
70 static void mark_vtable_entries (tree);
71 static bool maybe_emit_vtables (tree);
72 static bool acceptable_java_type (tree);
73 static tree start_objects (int, int);
74 static void finish_objects (int, int, tree);
75 static tree start_static_storage_duration_function (unsigned);
76 static void finish_static_storage_duration_function (tree);
77 static priority_info get_priority_info (int);
78 static void do_static_initialization_or_destruction (tree, bool);
79 static void one_static_initialization_or_destruction (tree, tree, bool);
80 static void generate_ctor_or_dtor_function (bool, int, location_t *);
81 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
83 static tree prune_vars_needing_no_initialization (tree *);
84 static void write_out_vars (tree);
85 static void import_export_class (tree);
86 static tree get_guard_bits (tree);
87 static void determine_visibility_from_class (tree, tree);
88 static bool decl_defined_p (tree);
90 /* A list of static class variables. This is needed, because a
91 static class variable can be declared inside the class without
92 an initializer, and then initialized, statically, outside the class. */
93 static GTY(()) VEC(tree,gc) *pending_statics;
95 /* A list of functions which were declared inline, but which we
96 may need to emit outline anyway. */
97 static GTY(()) VEC(tree,gc) *deferred_fns;
99 /* A list of decls that use types with no linkage, which we need to make
101 static GTY(()) VEC(tree,gc) *no_linkage_decls;
103 /* Nonzero if we're done parsing and into end-of-file activities. */
109 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
110 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
111 that apply to the function). */
114 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
119 if (fntype == error_mark_node || ctype == error_mark_node)
120 return error_mark_node;
122 type_quals = quals & ~TYPE_QUAL_RESTRICT;
123 ctype = cp_build_qualified_type (ctype, type_quals);
124 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
125 (TREE_CODE (fntype) == METHOD_TYPE
126 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
127 : TYPE_ARG_TYPES (fntype)));
128 raises = TYPE_RAISES_EXCEPTIONS (fntype);
130 fntype = build_exception_variant (fntype, raises);
135 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
139 cp_build_parm_decl (tree name, tree type)
141 tree parm = build_decl (input_location,
142 PARM_DECL, name, type);
143 /* DECL_ARG_TYPE is only used by the back end and the back end never
145 if (!processing_template_decl)
146 DECL_ARG_TYPE (parm) = type_passed_as (type);
148 /* If the type is a pack expansion, then we have a function
150 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
151 FUNCTION_PARAMETER_PACK_P (parm) = 1;
156 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
160 build_artificial_parm (tree name, tree type)
162 tree parm = cp_build_parm_decl (name, type);
163 DECL_ARTIFICIAL (parm) = 1;
164 /* All our artificial parms are implicitly `const'; they cannot be
166 TREE_READONLY (parm) = 1;
170 /* Constructors for types with virtual baseclasses need an "in-charge" flag
171 saying whether this constructor is responsible for initialization of
172 virtual baseclasses or not. All destructors also need this "in-charge"
173 flag, which additionally determines whether or not the destructor should
174 free the memory for the object.
176 This function adds the "in-charge" flag to member function FN if
177 appropriate. It is called from grokclassfn and tsubst.
178 FN must be either a constructor or destructor.
180 The in-charge flag follows the 'this' parameter, and is followed by the
181 VTT parm (if any), then the user-written parms. */
184 maybe_retrofit_in_chrg (tree fn)
186 tree basetype, arg_types, parms, parm, fntype;
188 /* If we've already add the in-charge parameter don't do it again. */
189 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
192 /* When processing templates we can't know, in general, whether or
193 not we're going to have virtual baseclasses. */
194 if (processing_template_decl)
197 /* We don't need an in-charge parameter for constructors that don't
198 have virtual bases. */
199 if (DECL_CONSTRUCTOR_P (fn)
200 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
203 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
204 basetype = TREE_TYPE (TREE_VALUE (arg_types));
205 arg_types = TREE_CHAIN (arg_types);
207 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
209 /* If this is a subobject constructor or destructor, our caller will
210 pass us a pointer to our VTT. */
211 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
213 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
215 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
216 TREE_CHAIN (parm) = parms;
219 /* ...and then to TYPE_ARG_TYPES. */
220 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
222 DECL_HAS_VTT_PARM_P (fn) = 1;
225 /* Then add the in-charge parm (before the VTT parm). */
226 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
227 TREE_CHAIN (parm) = parms;
229 arg_types = hash_tree_chain (integer_type_node, arg_types);
231 /* Insert our new parameter(s) into the list. */
232 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
234 /* And rebuild the function type. */
235 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
237 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
238 fntype = build_exception_variant (fntype,
239 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
240 TREE_TYPE (fn) = fntype;
242 /* Now we've got the in-charge parameter. */
243 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
246 /* Classes overload their constituent function names automatically.
247 When a function name is declared in a record structure,
248 its name is changed to it overloaded name. Since names for
249 constructors and destructors can conflict, we place a leading
252 CNAME is the name of the class we are grokking for.
254 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
256 FLAGS contains bits saying what's special about today's
257 arguments. DTOR_FLAG == DESTRUCTOR.
259 If FUNCTION is a destructor, then we must add the `auto-delete' field
260 as a second parameter. There is some hair associated with the fact
261 that we must "declare" this variable in the manner consistent with the
262 way the rest of the arguments were declared.
264 QUALS are the qualifiers for the this pointer. */
267 grokclassfn (tree ctype, tree function, enum overload_flags flags)
269 tree fn_name = DECL_NAME (function);
271 /* Even within an `extern "C"' block, members get C++ linkage. See
272 [dcl.link] for details. */
273 SET_DECL_LANGUAGE (function, lang_cplusplus);
275 if (fn_name == NULL_TREE)
277 error ("name missing for member function");
278 fn_name = get_identifier ("<anonymous>");
279 DECL_NAME (function) = fn_name;
282 DECL_CONTEXT (function) = ctype;
284 if (flags == DTOR_FLAG)
285 DECL_DESTRUCTOR_P (function) = 1;
287 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
288 maybe_retrofit_in_chrg (function);
291 /* Create an ARRAY_REF, checking for the user doing things backwards
295 grok_array_decl (tree array_expr, tree index_exp)
299 tree orig_array_expr = array_expr;
300 tree orig_index_exp = index_exp;
302 if (error_operand_p (array_expr) || error_operand_p (index_exp))
303 return error_mark_node;
305 if (processing_template_decl)
307 if (type_dependent_expression_p (array_expr)
308 || type_dependent_expression_p (index_exp))
309 return build_min_nt (ARRAY_REF, array_expr, index_exp,
310 NULL_TREE, NULL_TREE);
311 array_expr = build_non_dependent_expr (array_expr);
312 index_exp = build_non_dependent_expr (index_exp);
315 type = TREE_TYPE (array_expr);
317 type = non_reference (type);
319 /* If they have an `operator[]', use that. */
320 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
321 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
322 array_expr, index_exp, NULL_TREE,
323 /*overloaded_p=*/NULL, tf_warning_or_error);
328 /* Otherwise, create an ARRAY_REF for a pointer or array type.
329 It is a little-known fact that, if `a' is an array and `i' is
330 an int, you can write `i[a]', which means the same thing as
332 if (TREE_CODE (type) == ARRAY_TYPE)
335 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
337 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
340 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
342 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
344 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
347 if ((p1 && i2) && (i1 && p2))
348 error ("ambiguous conversion for array subscript");
351 array_expr = p1, index_exp = i2;
353 array_expr = p2, index_exp = i1;
356 error ("invalid types %<%T[%T]%> for array subscript",
357 type, TREE_TYPE (index_exp));
358 return error_mark_node;
361 if (array_expr == error_mark_node || index_exp == error_mark_node)
362 error ("ambiguous conversion for array subscript");
364 expr = build_array_ref (input_location, array_expr, index_exp);
366 if (processing_template_decl && expr != error_mark_node)
367 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
368 NULL_TREE, NULL_TREE);
372 /* Given the cast expression EXP, checking out its validity. Either return
373 an error_mark_node if there was an unavoidable error, return a cast to
374 void for trying to delete a pointer w/ the value 0, or return the
375 call to delete. If DOING_VEC is true, we handle things differently
376 for doing an array delete.
377 Implements ARM $5.3.4. This is called from the parser. */
380 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
384 if (exp == error_mark_node)
387 if (processing_template_decl)
389 t = build_min (DELETE_EXPR, void_type_node, exp, size);
390 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
391 DELETE_EXPR_USE_VEC (t) = doing_vec;
392 TREE_SIDE_EFFECTS (t) = 1;
396 /* An array can't have been allocated by new, so complain. */
397 if (TREE_CODE (exp) == VAR_DECL
398 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
399 warning (0, "deleting array %q#D", exp);
401 t = build_expr_type_conversion (WANT_POINTER, exp, true);
403 if (t == NULL_TREE || t == error_mark_node)
405 error ("type %q#T argument given to %<delete%>, expected pointer",
407 return error_mark_node;
410 type = TREE_TYPE (t);
412 /* As of Valley Forge, you can delete a pointer to const. */
414 /* You can't delete functions. */
415 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
417 error ("cannot delete a function. Only pointer-to-objects are "
418 "valid arguments to %<delete%>");
419 return error_mark_node;
422 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
423 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
425 warning (0, "deleting %qT is undefined", type);
429 /* Deleting a pointer with the value zero is valid and has no effect. */
430 if (integer_zerop (t))
431 return build1 (NOP_EXPR, void_type_node, t);
434 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
435 sfk_deleting_destructor,
438 return build_delete (type, t, sfk_deleting_destructor,
439 LOOKUP_NORMAL, use_global_delete);
442 /* Report an error if the indicated template declaration is not the
443 sort of thing that should be a member template. */
446 check_member_template (tree tmpl)
450 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
451 decl = DECL_TEMPLATE_RESULT (tmpl);
453 if (TREE_CODE (decl) == FUNCTION_DECL
454 || (TREE_CODE (decl) == TYPE_DECL
455 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
457 /* The parser rejects template declarations in local classes. */
458 gcc_assert (!current_function_decl);
459 /* The parser rejects any use of virtual in a function template. */
460 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
461 && DECL_VIRTUAL_P (decl)));
463 /* The debug-information generating code doesn't know what to do
464 with member templates. */
465 DECL_IGNORED_P (tmpl) = 1;
468 error ("template declaration of %q#D", decl);
471 /* Return true iff TYPE is a valid Java parameter or return type. */
474 acceptable_java_type (tree type)
476 if (type == error_mark_node)
479 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
481 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
483 type = TREE_TYPE (type);
484 if (TREE_CODE (type) == RECORD_TYPE)
487 if (! TYPE_FOR_JAVA (type))
489 if (! CLASSTYPE_TEMPLATE_INFO (type))
491 args = CLASSTYPE_TI_ARGS (type);
492 i = TREE_VEC_LENGTH (args);
495 type = TREE_VEC_ELT (args, i);
496 if (TREE_CODE (type) == POINTER_TYPE)
497 type = TREE_TYPE (type);
498 if (! TYPE_FOR_JAVA (type))
507 /* For a METHOD in a Java class CTYPE, return true if
508 the parameter and return types are valid Java types.
509 Otherwise, print appropriate error messages, and return false. */
512 check_java_method (tree method)
515 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
516 tree ret_type = TREE_TYPE (TREE_TYPE (method));
518 if (!acceptable_java_type (ret_type))
520 error ("Java method %qD has non-Java return type %qT",
525 arg_types = TREE_CHAIN (arg_types);
526 if (DECL_HAS_IN_CHARGE_PARM_P (method))
527 arg_types = TREE_CHAIN (arg_types);
528 if (DECL_HAS_VTT_PARM_P (method))
529 arg_types = TREE_CHAIN (arg_types);
531 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
533 tree type = TREE_VALUE (arg_types);
534 if (!acceptable_java_type (type))
536 if (type != error_mark_node)
537 error ("Java method %qD has non-Java parameter type %qT",
545 /* Sanity check: report error if this function FUNCTION is not
546 really a member of the class (CTYPE) it is supposed to belong to.
547 TEMPLATE_PARMS is used to specify the template parameters of a member
548 template passed as FUNCTION_DECL. If the member template is passed as a
549 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
550 from the declaration. If the function is not a function template, it
552 It returns the original declaration for the function, NULL_TREE if
553 no declaration was found, error_mark_node if an error was emitted. */
556 check_classfn (tree ctype, tree function, tree template_parms)
562 if (DECL_USE_TEMPLATE (function)
563 && !(TREE_CODE (function) == TEMPLATE_DECL
564 && DECL_TEMPLATE_SPECIALIZATION (function))
565 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
566 /* Since this is a specialization of a member template,
567 we're not going to find the declaration in the class.
570 struct S { template <typename T> void f(T); };
571 template <> void S::f(int);
573 we're not going to find `S::f(int)', but there's no
574 reason we should, either. We let our callers know we didn't
575 find the method, but we don't complain. */
578 /* Basic sanity check: for a template function, the template parameters
579 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
580 if (TREE_CODE (function) == TEMPLATE_DECL)
583 && !comp_template_parms (template_parms,
584 DECL_TEMPLATE_PARMS (function)))
586 error ("template parameter lists provided don't match the "
587 "template parameters of %qD", function);
588 return error_mark_node;
590 template_parms = DECL_TEMPLATE_PARMS (function);
593 /* OK, is this a definition of a member template? */
594 is_template = (template_parms != NULL_TREE);
596 /* We must enter the scope here, because conversion operators are
597 named by target type, and type equivalence relies on typenames
598 resolving within the scope of CTYPE. */
599 pushed_scope = push_scope (ctype);
600 ix = class_method_index_for_fn (complete_type (ctype), function);
603 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
604 tree fndecls, fndecl = 0;
606 const char *format = NULL;
608 for (fndecls = VEC_index (tree, methods, ix);
609 fndecls; fndecls = OVL_NEXT (fndecls))
613 fndecl = OVL_CURRENT (fndecls);
614 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
615 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
617 /* We cannot simply call decls_match because this doesn't
618 work for static member functions that are pretending to
619 be methods, and because the name may have been changed by
622 /* Get rid of the this parameter on functions that become
624 if (DECL_STATIC_FUNCTION_P (fndecl)
625 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
626 p1 = TREE_CHAIN (p1);
628 /* A member template definition only matches a member template
630 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
633 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
634 TREE_TYPE (TREE_TYPE (fndecl)))
635 && compparms (p1, p2)
637 || comp_template_parms (template_parms,
638 DECL_TEMPLATE_PARMS (fndecl)))
639 && (DECL_TEMPLATE_SPECIALIZATION (function)
640 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
641 && (!DECL_TEMPLATE_SPECIALIZATION (function)
642 || (DECL_TI_TEMPLATE (function)
643 == DECL_TI_TEMPLATE (fndecl))))
649 pop_scope (pushed_scope);
650 return OVL_CURRENT (fndecls);
653 error_at (DECL_SOURCE_LOCATION (function),
654 "prototype for %q#D does not match any in class %qT",
656 is_conv_op = DECL_CONV_FN_P (fndecl);
659 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
660 fndecls = VEC_index (tree, methods, ix);
663 fndecl = OVL_CURRENT (fndecls);
664 fndecls = OVL_NEXT (fndecls);
666 if (!fndecls && is_conv_op)
668 if (VEC_length (tree, methods) > (size_t) ++ix)
670 fndecls = VEC_index (tree, methods, ix);
671 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
683 format = N_("candidates are: %+#D");
685 format = N_("candidate is: %+#D");
686 error (format, fndecl);
689 else if (!COMPLETE_TYPE_P (ctype))
690 cxx_incomplete_type_error (function, ctype);
692 error ("no %q#D member function declared in class %qT",
696 pop_scope (pushed_scope);
697 return error_mark_node;
700 /* DECL is a function with vague linkage. Remember it so that at the
701 end of the translation unit we can decide whether or not to emit
705 note_vague_linkage_fn (tree decl)
707 DECL_DEFER_OUTPUT (decl) = 1;
708 VEC_safe_push (tree, gc, deferred_fns, decl);
711 /* We have just processed the DECL, which is a static data member.
712 The other parameters are as for cp_finish_decl. */
715 finish_static_data_member_decl (tree decl,
716 tree init, bool init_const_expr_p,
720 DECL_CONTEXT (decl) = current_class_type;
722 /* We cannot call pushdecl here, because that would fill in the
723 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
724 the right thing, namely, to put this decl out straight away. */
726 if (! processing_template_decl)
727 VEC_safe_push (tree, gc, pending_statics, decl);
729 if (LOCAL_CLASS_P (current_class_type))
730 permerror (input_location, "local class %q#T shall not have static data member %q#D",
731 current_class_type, decl);
733 /* Static consts need not be initialized in the class definition. */
734 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
736 static int explained = 0;
738 error ("initializer invalid for static member with constructor");
741 error ("(an out of class initialization is required)");
747 DECL_INITIAL (decl) = init;
748 DECL_IN_AGGR_P (decl) = 1;
750 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
753 /* DECLARATOR and DECLSPECS correspond to a class member. The other
754 parameters are as for cp_finish_decl. Return the DECL for the
755 class member declared. */
758 grokfield (const cp_declarator *declarator,
759 cp_decl_specifier_seq *declspecs,
760 tree init, bool init_const_expr_p,
765 const char *asmspec = 0;
766 int flags = LOOKUP_ONLYCONVERTING;
770 && TREE_CODE (init) == TREE_LIST
771 && TREE_VALUE (init) == error_mark_node
772 && TREE_CHAIN (init) == NULL_TREE)
775 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
776 if (! value || error_operand_p (value))
777 /* friend or constructor went bad. */
778 return error_mark_node;
780 if (TREE_CODE (value) == TYPE_DECL && init)
782 error ("typedef %qD is initialized (use __typeof__ instead)", value);
786 /* Pass friendly classes back. */
787 if (value == void_type_node)
790 /* Pass friend decls back. */
791 if ((TREE_CODE (value) == FUNCTION_DECL
792 || TREE_CODE (value) == TEMPLATE_DECL)
793 && DECL_CONTEXT (value) != current_class_type)
796 name = DECL_NAME (value);
798 if (name != NULL_TREE)
800 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
802 error ("explicit template argument list not allowed");
803 return error_mark_node;
806 if (IDENTIFIER_POINTER (name)[0] == '_'
807 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
808 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);
825 /* If this is a typedef that names the class for linkage purposes
826 (7.1.3p8), apply any attributes directly to the type. */
827 if (TAGGED_TYPE_P (TREE_TYPE (value))
828 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
829 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
831 cplus_decl_attributes (&value, attrlist, attrflags);
834 if (declspecs->specs[(int)ds_typedef]
835 && TREE_TYPE (value) != error_mark_node
836 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
837 set_underlying_type (value);
842 if (DECL_IN_AGGR_P (value))
844 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
845 return void_type_node;
848 if (asmspec_tree && asmspec_tree != error_mark_node)
849 asmspec = TREE_STRING_POINTER (asmspec_tree);
853 if (TREE_CODE (value) == FUNCTION_DECL)
855 /* Initializers for functions are rejected early in the parser.
856 If we get here, it must be a pure specifier for a method. */
857 if (init == ridpointers[(int)RID_DELETE])
859 DECL_DELETED_FN (value) = 1;
860 DECL_DECLARED_INLINE_P (value) = 1;
861 DECL_INITIAL (value) = error_mark_node;
863 else if (init == ridpointers[(int)RID_DEFAULT])
865 if (defaultable_fn_check (value))
867 DECL_DEFAULTED_FN (value) = 1;
868 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
869 DECL_DECLARED_INLINE_P (value) = 1;
872 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
874 gcc_assert (error_operand_p (init) || integer_zerop (init));
875 DECL_PURE_VIRTUAL_P (value) = 1;
879 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
880 error ("initializer specified for static member function %qD",
884 else if (pedantic && TREE_CODE (value) != VAR_DECL)
885 /* Already complained in grokdeclarator. */
887 else if (!processing_template_decl)
889 if (TREE_CODE (init) == CONSTRUCTOR)
890 init = digest_init (TREE_TYPE (value), init);
892 init = integral_constant_value (init);
894 if (init != error_mark_node && !TREE_CONSTANT (init))
896 /* We can allow references to things that are effectively
897 static, since references are initialized with the
899 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
900 || (TREE_STATIC (init) == 0
901 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
903 error ("field initializer is not constant");
904 init = error_mark_node;
910 if (processing_template_decl
911 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
913 value = push_template_decl (value);
914 if (error_operand_p (value))
915 return error_mark_node;
919 cplus_decl_attributes (&value, attrlist, 0);
921 switch (TREE_CODE (value))
924 finish_static_data_member_decl (value, init, init_const_expr_p,
925 asmspec_tree, flags);
930 error ("%<asm%> specifiers are not permitted on non-static data members");
931 if (DECL_INITIAL (value) == error_mark_node)
932 init = error_mark_node;
933 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
935 DECL_INITIAL (value) = init;
936 DECL_IN_AGGR_P (value) = 1;
941 set_user_assembler_name (value, asmspec);
943 cp_finish_decl (value,
945 /*init_const_expr_p=*/false,
946 asmspec_tree, flags);
948 /* Pass friends back this way. */
949 if (DECL_FRIEND_P (value))
950 return void_type_node;
952 DECL_IN_AGGR_P (value) = 1;
961 /* Like `grokfield', but for bitfields.
962 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
965 grokbitfield (const cp_declarator *declarator,
966 cp_decl_specifier_seq *declspecs, tree width,
969 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
971 if (value == error_mark_node)
972 return NULL_TREE; /* friends went bad. */
974 /* Pass friendly classes back. */
975 if (TREE_CODE (value) == VOID_TYPE)
976 return void_type_node;
978 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
979 && (POINTER_TYPE_P (value)
980 || !dependent_type_p (TREE_TYPE (value))))
982 error ("bit-field %qD with non-integral type", value);
983 return error_mark_node;
986 if (TREE_CODE (value) == TYPE_DECL)
988 error ("cannot declare %qD to be a bit-field type", value);
992 /* Usually, finish_struct_1 catches bitfields with invalid types.
993 But, in the case of bitfields with function type, we confuse
994 ourselves into thinking they are member functions, so we must
996 if (TREE_CODE (value) == FUNCTION_DECL)
998 error ("cannot declare bit-field %qD with function type",
1003 if (DECL_IN_AGGR_P (value))
1005 error ("%qD is already defined in the class %qT", value,
1006 DECL_CONTEXT (value));
1007 return void_type_node;
1010 if (TREE_STATIC (value))
1012 error ("static member %qD cannot be a bit-field", value);
1015 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1017 if (width != error_mark_node)
1019 constant_expression_warning (width);
1020 DECL_INITIAL (value) = width;
1021 SET_DECL_C_BIT_FIELD (value);
1024 DECL_IN_AGGR_P (value) = 1;
1027 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1033 /* Returns true iff ATTR is an attribute which needs to be applied at
1034 instantiation time rather than template definition time. */
1037 is_late_template_attribute (tree attr, tree decl)
1039 tree name = TREE_PURPOSE (attr);
1040 tree args = TREE_VALUE (attr);
1041 const struct attribute_spec *spec = lookup_attribute_spec (name);
1045 /* Unknown attribute. */
1048 /* Attribute weak handling wants to write out assembly right away. */
1049 if (is_attribute_p ("weak", name))
1052 /* If any of the arguments are dependent expressions, we can't evaluate
1053 the attribute until instantiation time. */
1054 for (arg = args; arg; arg = TREE_CHAIN (arg))
1056 tree t = TREE_VALUE (arg);
1058 /* If the first attribute argument is an identifier, only consider
1059 second and following arguments. Attributes like mode, format,
1060 cleanup and several target specific attributes aren't late
1061 just because they have an IDENTIFIER_NODE as first argument. */
1062 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1065 if (value_dependent_expression_p (t)
1066 || type_dependent_expression_p (t))
1070 if (TREE_CODE (decl) == TYPE_DECL
1072 || spec->type_required)
1074 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1076 /* We can't apply any attributes to a completely unknown type until
1077 instantiation time. */
1078 enum tree_code code = TREE_CODE (type);
1079 if (code == TEMPLATE_TYPE_PARM
1080 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1081 || code == TYPENAME_TYPE)
1083 /* Also defer most attributes on dependent types. This is not
1084 necessary in all cases, but is the better default. */
1085 else if (dependent_type_p (type)
1086 /* But attribute visibility specifically works on
1088 && !is_attribute_p ("visibility", name))
1097 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1098 applied at instantiation time and return them. If IS_DEPENDENT is true,
1099 the declaration itself is dependent, so all attributes should be applied
1100 at instantiation time. */
1103 splice_template_attributes (tree *attr_p, tree decl)
1106 tree late_attrs = NULL_TREE;
1107 tree *q = &late_attrs;
1114 if (is_late_template_attribute (*p, decl))
1116 ATTR_IS_DEPENDENT (*p) = 1;
1118 *p = TREE_CHAIN (*p);
1119 q = &TREE_CHAIN (*q);
1123 p = &TREE_CHAIN (*p);
1129 /* Remove any late attributes from the list in ATTR_P and attach them to
1133 save_template_attributes (tree *attr_p, tree *decl_p)
1135 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1137 tree old_attrs = NULL_TREE;
1142 if (DECL_P (*decl_p))
1143 q = &DECL_ATTRIBUTES (*decl_p);
1145 q = &TYPE_ATTRIBUTES (*decl_p);
1149 /* Place the late attributes at the beginning of the attribute
1151 TREE_CHAIN (tree_last (late_attrs)) = *q;
1154 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1156 /* We've added new attributes directly to the main variant, so
1157 now we need to update all of the other variants to include
1158 these new attributes. */
1160 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1161 variant = TYPE_NEXT_VARIANT (variant))
1163 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1164 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1169 /* Like reconstruct_complex_type, but handle also template trees. */
1172 cp_reconstruct_complex_type (tree type, tree bottom)
1176 if (TREE_CODE (type) == POINTER_TYPE)
1178 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1179 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1180 TYPE_REF_CAN_ALIAS_ALL (type));
1182 else if (TREE_CODE (type) == REFERENCE_TYPE)
1184 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1185 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1186 TYPE_REF_CAN_ALIAS_ALL (type));
1188 else if (TREE_CODE (type) == ARRAY_TYPE)
1190 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1191 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1192 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1193 element type qualification will be handled by the recursive
1194 cp_reconstruct_complex_type call and cp_build_qualified_type
1195 for ARRAY_TYPEs changes the element type. */
1198 else if (TREE_CODE (type) == FUNCTION_TYPE)
1200 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1201 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1203 else if (TREE_CODE (type) == METHOD_TYPE)
1205 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1206 /* The build_method_type_directly() routine prepends 'this' to argument list,
1207 so we must compensate by getting rid of it. */
1209 = build_method_type_directly
1210 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1212 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1214 else if (TREE_CODE (type) == OFFSET_TYPE)
1216 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1217 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1222 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1225 /* Like decl_attributes, but handle C++ complexity. */
1228 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1230 if (*decl == NULL_TREE || *decl == void_type_node
1231 || *decl == error_mark_node
1232 || attributes == NULL_TREE)
1235 if (processing_template_decl)
1237 if (check_for_bare_parameter_packs (attributes))
1240 save_template_attributes (&attributes, decl);
1241 if (attributes == NULL_TREE)
1245 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1246 decl = &DECL_TEMPLATE_RESULT (*decl);
1248 decl_attributes (decl, attributes, flags);
1250 if (TREE_CODE (*decl) == TYPE_DECL)
1251 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1254 /* Walks through the namespace- or function-scope anonymous union
1255 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1256 Returns one of the fields for use in the mangled name. */
1259 build_anon_union_vars (tree type, tree object)
1261 tree main_decl = NULL_TREE;
1264 /* Rather than write the code to handle the non-union case,
1265 just give an error. */
1266 if (TREE_CODE (type) != UNION_TYPE)
1267 error ("anonymous struct not inside named type");
1269 for (field = TYPE_FIELDS (type);
1271 field = TREE_CHAIN (field))
1276 if (DECL_ARTIFICIAL (field))
1278 if (TREE_CODE (field) != FIELD_DECL)
1280 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1281 "have non-static data members", field);
1285 if (TREE_PRIVATE (field))
1286 permerror (input_location, "private member %q+#D in anonymous union", field);
1287 else if (TREE_PROTECTED (field))
1288 permerror (input_location, "protected member %q+#D in anonymous union", field);
1290 if (processing_template_decl)
1291 ref = build_min_nt (COMPONENT_REF, object,
1292 DECL_NAME (field), NULL_TREE);
1294 ref = build_class_member_access_expr (object, field, NULL_TREE,
1295 false, tf_warning_or_error);
1297 if (DECL_NAME (field))
1301 decl = build_decl (input_location,
1302 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1303 DECL_ANON_UNION_VAR_P (decl) = 1;
1305 base = get_base_address (object);
1306 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1307 TREE_STATIC (decl) = TREE_STATIC (base);
1308 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1310 SET_DECL_VALUE_EXPR (decl, ref);
1311 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1313 decl = pushdecl (decl);
1315 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1316 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1320 if (main_decl == NULL_TREE)
1327 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1328 anonymous union, then all members must be laid out together. PUBLIC_P
1329 is nonzero if this union is not declared static. */
1332 finish_anon_union (tree anon_union_decl)
1338 if (anon_union_decl == error_mark_node)
1341 type = TREE_TYPE (anon_union_decl);
1342 public_p = TREE_PUBLIC (anon_union_decl);
1344 /* The VAR_DECL's context is the same as the TYPE's context. */
1345 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1347 if (TYPE_FIELDS (type) == NULL_TREE)
1352 error ("namespace-scope anonymous aggregates must be static");
1356 main_decl = build_anon_union_vars (type, anon_union_decl);
1357 if (main_decl == error_mark_node)
1359 if (main_decl == NULL_TREE)
1361 warning (0, "anonymous union with no members");
1365 if (!processing_template_decl)
1367 /* Use main_decl to set the mangled name. */
1368 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1369 maybe_commonize_var (anon_union_decl);
1370 mangle_decl (anon_union_decl);
1371 DECL_NAME (anon_union_decl) = NULL_TREE;
1374 pushdecl (anon_union_decl);
1375 if (building_stmt_tree ()
1376 && at_function_scope_p ())
1377 add_decl_expr (anon_union_decl);
1378 else if (!processing_template_decl)
1379 rest_of_decl_compilation (anon_union_decl,
1380 toplevel_bindings_p (), at_eof);
1383 /* Auxiliary functions to make type signatures for
1384 `operator new' and `operator delete' correspond to
1385 what compiler will be expecting. */
1388 coerce_new_type (tree type)
1391 tree args = TYPE_ARG_TYPES (type);
1393 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1395 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1398 error ("%<operator new%> must return type %qT", ptr_type_node);
1401 if (args && args != void_list_node)
1403 if (TREE_PURPOSE (args))
1405 /* [basic.stc.dynamic.allocation]
1407 The first parameter shall not have an associated default
1409 error ("the first parameter of %<operator new%> cannot "
1410 "have a default argument");
1411 /* Throw away the default argument. */
1412 TREE_PURPOSE (args) = NULL_TREE;
1415 if (!same_type_p (TREE_VALUE (args), size_type_node))
1418 args = TREE_CHAIN (args);
1425 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1426 "as first parameter", size_type_node);
1431 args = tree_cons (NULL_TREE, size_type_node, args);
1434 type = build_exception_variant
1435 (build_function_type (ptr_type_node, args),
1436 TYPE_RAISES_EXCEPTIONS (type));
1444 coerce_delete_type (tree type)
1447 tree args = TYPE_ARG_TYPES (type);
1449 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1451 if (!same_type_p (TREE_TYPE (type), void_type_node))
1454 error ("%<operator delete%> must return type %qT", void_type_node);
1457 if (!args || args == void_list_node
1458 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1461 if (args && args != void_list_node)
1462 args = TREE_CHAIN (args);
1463 error ("%<operator delete%> takes type %qT as first parameter",
1469 args = tree_cons (NULL_TREE, ptr_type_node, args);
1472 type = build_exception_variant
1473 (build_function_type (void_type_node, args),
1474 TYPE_RAISES_EXCEPTIONS (type));
1482 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1483 and mark them as needed. */
1486 mark_vtable_entries (tree decl)
1489 unsigned HOST_WIDE_INT idx;
1491 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1496 STRIP_NOPS (fnaddr);
1498 if (TREE_CODE (fnaddr) != ADDR_EXPR
1499 && TREE_CODE (fnaddr) != FDESC_EXPR)
1500 /* This entry is an offset: a virtual base class offset, a
1501 virtual call offset, an RTTI offset, etc. */
1504 fn = TREE_OPERAND (fnaddr, 0);
1505 TREE_ADDRESSABLE (fn) = 1;
1506 /* When we don't have vcall offsets, we output thunks whenever
1507 we output the vtables that contain them. With vcall offsets,
1508 we know all the thunks we'll need when we emit a virtual
1509 function, so we emit the thunks there instead. */
1510 if (DECL_THUNK_P (fn))
1511 use_thunk (fn, /*emit_p=*/0);
1516 /* Set DECL up to have the closest approximation of "initialized common"
1517 linkage available. */
1520 comdat_linkage (tree decl)
1523 make_decl_one_only (decl, cxx_comdat_group (decl));
1524 else if (TREE_CODE (decl) == FUNCTION_DECL
1525 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1526 /* We can just emit function and compiler-generated variables
1527 statically; having multiple copies is (for the most part) only
1530 There are two correctness issues, however: the address of a
1531 template instantiation with external linkage should be the
1532 same, independent of what translation unit asks for the
1533 address, and this will not hold when we emit multiple copies of
1534 the function. However, there's little else we can do.
1536 Also, by default, the typeinfo implementation assumes that
1537 there will be only one copy of the string used as the name for
1538 each type. Therefore, if weak symbols are unavailable, the
1539 run-time library should perform a more conservative check; it
1540 should perform a string comparison, rather than an address
1542 TREE_PUBLIC (decl) = 0;
1545 /* Static data member template instantiations, however, cannot
1546 have multiple copies. */
1547 if (DECL_INITIAL (decl) == 0
1548 || DECL_INITIAL (decl) == error_mark_node)
1549 DECL_COMMON (decl) = 1;
1550 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1552 DECL_COMMON (decl) = 1;
1553 DECL_INITIAL (decl) = error_mark_node;
1555 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1557 /* We can't do anything useful; leave vars for explicit
1559 DECL_EXTERNAL (decl) = 1;
1560 DECL_NOT_REALLY_EXTERN (decl) = 0;
1564 if (DECL_LANG_SPECIFIC (decl))
1565 DECL_COMDAT (decl) = 1;
1568 /* For win32 we also want to put explicit instantiations in
1569 linkonce sections, so that they will be merged with implicit
1570 instantiations; otherwise we get duplicate symbol errors.
1571 For Darwin we do not want explicit instantiations to be
1575 maybe_make_one_only (tree decl)
1577 /* We used to say that this was not necessary on targets that support weak
1578 symbols, because the implicit instantiations will defer to the explicit
1579 one. However, that's not actually the case in SVR4; a strong definition
1580 after a weak one is an error. Also, not making explicit
1581 instantiations one_only means that we can end up with two copies of
1582 some template instantiations. */
1586 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1587 we can get away with not emitting them if they aren't used. We need
1588 to for variables so that cp_finish_decl will update their linkage,
1589 because their DECL_INITIAL may not have been set properly yet. */
1591 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1592 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1593 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1595 make_decl_one_only (decl, cxx_comdat_group (decl));
1597 if (TREE_CODE (decl) == VAR_DECL)
1599 DECL_COMDAT (decl) = 1;
1600 /* Mark it needed so we don't forget to emit it. */
1601 mark_decl_referenced (decl);
1606 /* Returns true iff DECL, a FUNCTION_DECL, has vague linkage. This
1607 predicate will give the right answer during parsing of the function,
1608 which other tests may not. */
1611 vague_linkage_fn_p (tree fn)
1613 /* Unfortunately, import_export_decl has not always been called
1614 before the function is processed, so we cannot simply check
1616 return (DECL_COMDAT (fn)
1617 || ((DECL_DECLARED_INLINE_P (fn)
1618 || DECL_TEMPLATE_INSTANTIATION (fn))
1619 && TREE_PUBLIC (fn)));
1622 /* Determine whether or not we want to specifically import or export CTYPE,
1623 using various heuristics. */
1626 import_export_class (tree ctype)
1628 /* -1 for imported, 1 for exported. */
1629 int import_export = 0;
1631 /* It only makes sense to call this function at EOF. The reason is
1632 that this function looks at whether or not the first non-inline
1633 non-abstract virtual member function has been defined in this
1634 translation unit. But, we can't possibly know that until we've
1635 seen the entire translation unit. */
1636 gcc_assert (at_eof);
1638 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1641 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1642 we will have CLASSTYPE_INTERFACE_ONLY set but not
1643 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1644 heuristic because someone will supply a #pragma implementation
1645 elsewhere, and deducing it here would produce a conflict. */
1646 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1649 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1651 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1653 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1654 && !flag_implicit_templates)
1655 /* For a template class, without -fimplicit-templates, check the
1656 repository. If the virtual table is assigned to this
1657 translation unit, then export the class; otherwise, import
1659 import_export = repo_export_class_p (ctype) ? 1 : -1;
1660 else if (TYPE_POLYMORPHIC_P (ctype))
1662 /* The ABI specifies that the virtual table and associated
1663 information are emitted with the key method, if any. */
1664 tree method = CLASSTYPE_KEY_METHOD (ctype);
1665 /* If weak symbol support is not available, then we must be
1666 careful not to emit the vtable when the key function is
1667 inline. An inline function can be defined in multiple
1668 translation units. If we were to emit the vtable in each
1669 translation unit containing a definition, we would get
1670 multiple definition errors at link-time. */
1671 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1672 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1675 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1676 a definition anywhere else. */
1677 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1680 /* Allow back ends the chance to overrule the decision. */
1681 if (targetm.cxx.import_export_class)
1682 import_export = targetm.cxx.import_export_class (ctype, import_export);
1686 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1687 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1691 /* Return true if VAR has already been provided to the back end; in that
1692 case VAR should not be modified further by the front end. */
1694 var_finalized_p (tree var)
1696 return varpool_node (var)->finalized;
1699 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1700 must be emitted in this translation unit. Mark it as such. */
1703 mark_needed (tree decl)
1705 /* It's possible that we no longer need to set
1706 TREE_SYMBOL_REFERENCED here directly, but doing so is
1708 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1709 mark_decl_referenced (decl);
1712 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1713 returns true if a definition of this entity should be provided in
1714 this object file. Callers use this function to determine whether
1715 or not to let the back end know that a definition of DECL is
1716 available in this translation unit. */
1719 decl_needed_p (tree decl)
1721 gcc_assert (TREE_CODE (decl) == VAR_DECL
1722 || TREE_CODE (decl) == FUNCTION_DECL);
1723 /* This function should only be called at the end of the translation
1724 unit. We cannot be sure of whether or not something will be
1725 COMDAT until that point. */
1726 gcc_assert (at_eof);
1728 /* All entities with external linkage that are not COMDAT should be
1729 emitted; they may be referred to from other object files. */
1730 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1732 /* If this entity was used, let the back end see it; it will decide
1733 whether or not to emit it into the object file. */
1734 if (TREE_USED (decl)
1735 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1736 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1738 /* Functions marked "dllexport" must be emitted so that they are
1739 visible to other DLLs. */
1740 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1742 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1743 reference to DECL might cause it to be emitted later. */
1747 /* If necessary, write out the vtables for the dynamic class CTYPE.
1748 Returns true if any vtables were emitted. */
1751 maybe_emit_vtables (tree ctype)
1757 /* If the vtables for this class have already been emitted there is
1758 nothing more to do. */
1759 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1760 if (var_finalized_p (primary_vtbl))
1762 /* Ignore dummy vtables made by get_vtable_decl. */
1763 if (TREE_TYPE (primary_vtbl) == void_type_node)
1766 /* On some targets, we cannot determine the key method until the end
1767 of the translation unit -- which is when this function is
1769 if (!targetm.cxx.key_method_may_be_inline ())
1770 determine_key_method (ctype);
1772 /* See if any of the vtables are needed. */
1773 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1775 import_export_decl (vtbl);
1776 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1781 /* If the references to this class' vtables are optimized away,
1782 still emit the appropriate debugging information. See
1784 if (DECL_COMDAT (primary_vtbl)
1785 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1786 note_debug_info_needed (ctype);
1790 /* The ABI requires that we emit all of the vtables if we emit any
1792 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1794 /* Mark entities references from the virtual table as used. */
1795 mark_vtable_entries (vtbl);
1797 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1799 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1801 /* It had better be all done at compile-time. */
1806 DECL_EXTERNAL (vtbl) = 0;
1807 rest_of_decl_compilation (vtbl, 1, 1);
1809 /* Because we're only doing syntax-checking, we'll never end up
1810 actually marking the variable as written. */
1811 if (flag_syntax_only)
1812 TREE_ASM_WRITTEN (vtbl) = 1;
1815 /* Since we're writing out the vtable here, also write the debug
1817 note_debug_info_needed (ctype);
1822 /* A special return value from type_visibility meaning internal
1825 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1827 /* walk_tree helper function for type_visibility. */
1830 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1832 int *vis_p = (int *)data;
1837 else if (CLASS_TYPE_P (*tp))
1839 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1841 *vis_p = VISIBILITY_ANON;
1844 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1845 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1850 /* Returns the visibility of TYPE, which is the minimum visibility of its
1854 type_visibility (tree type)
1856 int vis = VISIBILITY_DEFAULT;
1857 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1861 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1862 specified (or if VISIBILITY is static). */
1865 constrain_visibility (tree decl, int visibility)
1867 if (visibility == VISIBILITY_ANON)
1869 /* extern "C" declarations aren't affected by the anonymous
1871 if (!DECL_EXTERN_C_P (decl))
1873 TREE_PUBLIC (decl) = 0;
1874 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1875 DECL_INTERFACE_KNOWN (decl) = 1;
1876 if (DECL_LANG_SPECIFIC (decl))
1877 DECL_NOT_REALLY_EXTERN (decl) = 1;
1880 else if (visibility > DECL_VISIBILITY (decl)
1881 && !DECL_VISIBILITY_SPECIFIED (decl))
1883 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1889 /* Constrain the visibility of DECL based on the visibility of its template
1893 constrain_visibility_for_template (tree decl, tree targs)
1895 /* If this is a template instantiation, check the innermost
1896 template args for visibility constraints. The outer template
1897 args are covered by the class check. */
1898 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1900 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1904 tree arg = TREE_VEC_ELT (args, i-1);
1906 vis = type_visibility (arg);
1907 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1910 if (TREE_CODE (arg) == ADDR_EXPR)
1911 arg = TREE_OPERAND (arg, 0);
1912 if (TREE_CODE (arg) == VAR_DECL
1913 || TREE_CODE (arg) == FUNCTION_DECL)
1915 if (! TREE_PUBLIC (arg))
1916 vis = VISIBILITY_ANON;
1918 vis = DECL_VISIBILITY (arg);
1922 constrain_visibility (decl, vis);
1926 /* Like c_determine_visibility, but with additional C++-specific
1929 Function-scope entities can rely on the function's visibility because
1930 it is set in start_preparsed_function.
1932 Class-scope entities cannot rely on the class's visibility until the end
1933 of the enclosing class definition.
1935 Note that because namespaces have multiple independent definitions,
1936 namespace visibility is handled elsewhere using the #pragma visibility
1937 machinery rather than by decorating the namespace declaration.
1939 The goal is for constraints from the type to give a diagnostic, and
1940 other constraints to be applied silently. */
1943 determine_visibility (tree decl)
1945 tree class_type = NULL_TREE;
1947 bool orig_visibility_specified;
1948 enum symbol_visibility orig_visibility;
1950 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1952 /* Only relevant for names with external linkage. */
1953 if (!TREE_PUBLIC (decl))
1956 /* Cloned constructors and destructors get the same visibility as
1957 the underlying function. That should be set up in
1958 maybe_clone_body. */
1959 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1961 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
1962 orig_visibility = DECL_VISIBILITY (decl);
1964 if (TREE_CODE (decl) == TYPE_DECL)
1966 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1967 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1968 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1973 else if (DECL_LANG_SPECIFIC (decl))
1974 use_template = DECL_USE_TEMPLATE (decl);
1978 /* If DECL is a member of a class, visibility specifiers on the
1979 class can influence the visibility of the DECL. */
1980 if (DECL_CLASS_SCOPE_P (decl))
1981 class_type = DECL_CONTEXT (decl);
1984 /* Not a class member. */
1986 /* Virtual tables have DECL_CONTEXT set to their associated class,
1987 so they are automatically handled above. */
1988 gcc_assert (TREE_CODE (decl) != VAR_DECL
1989 || !DECL_VTABLE_OR_VTT_P (decl));
1991 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1993 /* Local statics and classes get the visibility of their
1994 containing function by default, except that
1995 -fvisibility-inlines-hidden doesn't affect them. */
1996 tree fn = DECL_CONTEXT (decl);
1997 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1999 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2000 DECL_VISIBILITY_SPECIFIED (decl) =
2001 DECL_VISIBILITY_SPECIFIED (fn);
2004 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2006 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2007 but have no TEMPLATE_INFO, so don't try to check it. */
2010 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2011 && flag_visibility_ms_compat)
2013 /* Under -fvisibility-ms-compat, types are visible by default,
2014 even though their contents aren't. */
2015 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2016 int underlying_vis = type_visibility (underlying_type);
2017 if (underlying_vis == VISIBILITY_ANON
2018 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
2019 constrain_visibility (decl, underlying_vis);
2021 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2023 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2025 /* tinfo visibility is based on the type it's for. */
2026 constrain_visibility
2027 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2029 /* Give the target a chance to override the visibility associated
2031 if (TREE_PUBLIC (decl)
2032 && !DECL_REALLY_EXTERN (decl)
2033 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2034 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2035 targetm.cxx.determine_class_data_visibility (decl);
2037 else if (use_template)
2038 /* Template instantiations and specializations get visibility based
2039 on their template unless they override it with an attribute. */;
2040 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2042 /* Set default visibility to whatever the user supplied with
2043 #pragma GCC visibility or a namespace visibility attribute. */
2044 DECL_VISIBILITY (decl) = default_visibility;
2045 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2051 /* If the specialization doesn't specify visibility, use the
2052 visibility from the template. */
2053 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2054 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2055 : DECL_TEMPLATE_INFO (decl));
2056 tree args = TI_ARGS (tinfo);
2058 if (args != error_mark_node)
2060 int depth = TMPL_ARGS_DEPTH (args);
2061 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2063 if (!DECL_VISIBILITY_SPECIFIED (decl))
2065 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2066 DECL_VISIBILITY_SPECIFIED (decl)
2067 = DECL_VISIBILITY_SPECIFIED (pattern);
2070 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2071 if (args && depth > template_class_depth (class_type))
2072 /* Limit visibility based on its template arguments. */
2073 constrain_visibility_for_template (decl, args);
2078 determine_visibility_from_class (decl, class_type);
2080 if (decl_anon_ns_mem_p (decl))
2081 /* Names in an anonymous namespace get internal linkage.
2082 This might change once we implement export. */
2083 constrain_visibility (decl, VISIBILITY_ANON);
2084 else if (TREE_CODE (decl) != TYPE_DECL)
2086 /* Propagate anonymity from type to decl. */
2087 int tvis = type_visibility (TREE_TYPE (decl));
2088 if (tvis == VISIBILITY_ANON
2089 || ! DECL_VISIBILITY_SPECIFIED (decl))
2090 constrain_visibility (decl, tvis);
2092 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2093 /* DR 757: A type without linkage shall not be used as the type of a
2094 variable or function with linkage, unless
2095 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2096 o the variable or function is not used (3.2 [basic.def.odr]) or is
2097 defined in the same translation unit.
2099 Since non-extern "C" decls need to be defined in the same
2100 translation unit, we can make the type internal. */
2101 constrain_visibility (decl, VISIBILITY_ANON);
2103 /* If visibility changed and DECL already has DECL_RTL, ensure
2104 symbol flags are updated. */
2105 if ((DECL_VISIBILITY (decl) != orig_visibility
2106 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2107 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2108 || TREE_CODE (decl) == FUNCTION_DECL)
2109 && DECL_RTL_SET_P (decl))
2110 make_decl_rtl (decl);
2113 /* By default, static data members and function members receive
2114 the visibility of their containing class. */
2117 determine_visibility_from_class (tree decl, tree class_type)
2119 if (DECL_VISIBILITY_SPECIFIED (decl))
2122 if (visibility_options.inlines_hidden
2123 /* Don't do this for inline templates; specializations might not be
2124 inline, and we don't want them to inherit the hidden
2125 visibility. We'll set it here for all inline instantiations. */
2126 && !processing_template_decl
2127 && TREE_CODE (decl) == FUNCTION_DECL
2128 && DECL_DECLARED_INLINE_P (decl)
2129 && (! DECL_LANG_SPECIFIC (decl)
2130 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2131 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2134 /* Default to the class visibility. */
2135 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2136 DECL_VISIBILITY_SPECIFIED (decl)
2137 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2140 /* Give the target a chance to override the visibility associated
2142 if (TREE_CODE (decl) == VAR_DECL
2143 && (DECL_TINFO_P (decl)
2144 || (DECL_VTABLE_OR_VTT_P (decl)
2145 /* Construction virtual tables are not exported because
2146 they cannot be referred to from other object files;
2147 their name is not standardized by the ABI. */
2148 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2149 && TREE_PUBLIC (decl)
2150 && !DECL_REALLY_EXTERN (decl)
2151 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2152 targetm.cxx.determine_class_data_visibility (decl);
2155 /* Constrain the visibility of a class TYPE based on the visibility of its
2156 field types. Warn if any fields require lesser visibility. */
2159 constrain_class_visibility (tree type)
2165 int vis = type_visibility (type);
2167 if (vis == VISIBILITY_ANON
2168 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2171 /* Don't warn about visibility if the class has explicit visibility. */
2172 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2173 vis = VISIBILITY_INTERNAL;
2175 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2176 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2178 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2179 int subvis = type_visibility (ftype);
2181 if (subvis == VISIBILITY_ANON)
2183 if (!in_main_input_context ())
2185 %qT has a field %qD whose type uses the anonymous namespace",
2188 else if (MAYBE_CLASS_TYPE_P (ftype)
2189 && vis < VISIBILITY_HIDDEN
2190 && subvis >= VISIBILITY_HIDDEN)
2191 warning (OPT_Wattributes, "\
2192 %qT declared with greater visibility than the type of its field %qD",
2196 binfo = TYPE_BINFO (type);
2197 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2199 int subvis = type_visibility (TREE_TYPE (t));
2201 if (subvis == VISIBILITY_ANON)
2203 if (!in_main_input_context())
2205 %qT has a base %qT whose type uses the anonymous namespace",
2206 type, TREE_TYPE (t));
2208 else if (vis < VISIBILITY_HIDDEN
2209 && subvis >= VISIBILITY_HIDDEN)
2210 warning (OPT_Wattributes, "\
2211 %qT declared with greater visibility than its base %qT",
2212 type, TREE_TYPE (t));
2216 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2217 for DECL has not already been determined, do so now by setting
2218 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2219 function is called entities with vague linkage whose definitions
2220 are available must have TREE_PUBLIC set.
2222 If this function decides to place DECL in COMDAT, it will set
2223 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2224 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2225 callers defer that decision until it is clear that DECL is actually
2229 import_export_decl (tree decl)
2234 tree class_type = NULL_TREE;
2236 if (DECL_INTERFACE_KNOWN (decl))
2239 /* We cannot determine what linkage to give to an entity with vague
2240 linkage until the end of the file. For example, a virtual table
2241 for a class will be defined if and only if the key method is
2242 defined in this translation unit. As a further example, consider
2243 that when compiling a translation unit that uses PCH file with
2244 "-frepo" it would be incorrect to make decisions about what
2245 entities to emit when building the PCH; those decisions must be
2246 delayed until the repository information has been processed. */
2247 gcc_assert (at_eof);
2248 /* Object file linkage for explicit instantiations is handled in
2249 mark_decl_instantiated. For static variables in functions with
2250 vague linkage, maybe_commonize_var is used.
2252 Therefore, the only declarations that should be provided to this
2253 function are those with external linkage that are:
2255 * implicit instantiations of function templates
2259 * implicit instantiations of static data members of class
2266 Furthermore, all entities that reach this point must have a
2267 definition available in this translation unit.
2269 The following assertions check these conditions. */
2270 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2271 || TREE_CODE (decl) == VAR_DECL);
2272 /* Any code that creates entities with TREE_PUBLIC cleared should
2273 also set DECL_INTERFACE_KNOWN. */
2274 gcc_assert (TREE_PUBLIC (decl));
2275 if (TREE_CODE (decl) == FUNCTION_DECL)
2276 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2277 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2278 || DECL_DECLARED_INLINE_P (decl));
2280 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2281 || DECL_VTABLE_OR_VTT_P (decl)
2282 || DECL_TINFO_P (decl));
2283 /* Check that a definition of DECL is available in this translation
2285 gcc_assert (!DECL_REALLY_EXTERN (decl));
2287 /* Assume that DECL will not have COMDAT linkage. */
2289 /* Assume that DECL will not be imported into this translation
2293 /* See if the repository tells us whether or not to emit DECL in
2294 this translation unit. */
2295 emit_p = repo_emit_p (decl);
2298 else if (emit_p == 1)
2300 /* The repository indicates that this entity should be defined
2301 here. Make sure the back end honors that request. */
2302 if (TREE_CODE (decl) == VAR_DECL)
2304 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2305 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2308 FOR_EACH_CLONE (clone, decl)
2309 mark_needed (clone);
2313 /* Output the definition as an ordinary strong definition. */
2314 DECL_EXTERNAL (decl) = 0;
2315 DECL_INTERFACE_KNOWN (decl) = 1;
2320 /* We have already decided what to do with this DECL; there is no
2321 need to check anything further. */
2323 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2325 class_type = DECL_CONTEXT (decl);
2326 import_export_class (class_type);
2327 if (TYPE_FOR_JAVA (class_type))
2329 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2330 && CLASSTYPE_INTERFACE_ONLY (class_type))
2332 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2333 && !CLASSTYPE_USE_TEMPLATE (class_type)
2334 && CLASSTYPE_KEY_METHOD (class_type)
2335 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2336 /* The ABI requires that all virtual tables be emitted with
2337 COMDAT linkage. However, on systems where COMDAT symbols
2338 don't show up in the table of contents for a static
2339 archive, or on systems without weak symbols (where we
2340 approximate COMDAT linkage by using internal linkage), the
2341 linker will report errors about undefined symbols because
2342 it will not see the virtual table definition. Therefore,
2343 in the case that we know that the virtual table will be
2344 emitted in only one translation unit, we make the virtual
2345 table an ordinary definition with external linkage. */
2346 DECL_EXTERNAL (decl) = 0;
2347 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2349 /* CLASS_TYPE is being exported from this translation unit,
2350 so DECL should be defined here. */
2351 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2352 /* If a class is declared in a header with the "extern
2353 template" extension, then it will not be instantiated,
2354 even in translation units that would normally require
2355 it. Often such classes are explicitly instantiated in
2356 one translation unit. Therefore, the explicit
2357 instantiation must be made visible to other translation
2359 DECL_EXTERNAL (decl) = 0;
2362 /* The generic C++ ABI says that class data is always
2363 COMDAT, even if there is a key function. Some
2364 variants (e.g., the ARM EABI) says that class data
2365 only has COMDAT linkage if the class data might be
2366 emitted in more than one translation unit. When the
2367 key method can be inline and is inline, we still have
2368 to arrange for comdat even though
2369 class_data_always_comdat is false. */
2370 if (!CLASSTYPE_KEY_METHOD (class_type)
2371 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2372 || targetm.cxx.class_data_always_comdat ())
2374 /* The ABI requires COMDAT linkage. Normally, we
2375 only emit COMDAT things when they are needed;
2376 make sure that we realize that this entity is
2383 else if (!flag_implicit_templates
2384 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2389 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2391 tree type = TREE_TYPE (DECL_NAME (decl));
2392 if (CLASS_TYPE_P (type))
2395 import_export_class (type);
2396 if (CLASSTYPE_INTERFACE_KNOWN (type)
2397 && TYPE_POLYMORPHIC_P (type)
2398 && CLASSTYPE_INTERFACE_ONLY (type)
2399 /* If -fno-rtti was specified, then we cannot be sure
2400 that RTTI information will be emitted with the
2401 virtual table of the class, so we must emit it
2402 wherever it is used. */
2407 if (CLASSTYPE_INTERFACE_KNOWN (type)
2408 && !CLASSTYPE_INTERFACE_ONLY (type))
2410 comdat_p = (targetm.cxx.class_data_always_comdat ()
2411 || (CLASSTYPE_KEY_METHOD (type)
2412 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2417 DECL_EXTERNAL (decl) = 0;
2427 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2428 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2430 /* DECL is an implicit instantiation of a function or static
2432 if ((flag_implicit_templates
2433 && !flag_use_repository)
2434 || (flag_implicit_inline_templates
2435 && TREE_CODE (decl) == FUNCTION_DECL
2436 && DECL_DECLARED_INLINE_P (decl)))
2439 /* If we are not implicitly generating templates, then mark
2440 this entity as undefined in this translation unit. */
2443 else if (DECL_FUNCTION_MEMBER_P (decl))
2445 if (!DECL_DECLARED_INLINE_P (decl))
2447 tree ctype = DECL_CONTEXT (decl);
2448 import_export_class (ctype);
2449 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2451 DECL_NOT_REALLY_EXTERN (decl)
2452 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2453 || (DECL_DECLARED_INLINE_P (decl)
2454 && ! flag_implement_inlines
2455 && !DECL_VINDEX (decl)));
2457 if (!DECL_NOT_REALLY_EXTERN (decl))
2458 DECL_EXTERNAL (decl) = 1;
2460 /* Always make artificials weak. */
2461 if (DECL_ARTIFICIAL (decl) && flag_weak)
2464 maybe_make_one_only (decl);
2475 /* If we are importing DECL into this translation unit, mark is
2476 an undefined here. */
2477 DECL_EXTERNAL (decl) = 1;
2478 DECL_NOT_REALLY_EXTERN (decl) = 0;
2482 /* If we decided to put DECL in COMDAT, mark it accordingly at
2484 comdat_linkage (decl);
2487 DECL_INTERFACE_KNOWN (decl) = 1;
2490 /* Return an expression that performs the destruction of DECL, which
2491 must be a VAR_DECL whose type has a non-trivial destructor, or is
2492 an array whose (innermost) elements have a non-trivial destructor. */
2495 build_cleanup (tree decl)
2498 tree type = TREE_TYPE (decl);
2500 /* This function should only be called for declarations that really
2501 require cleanups. */
2502 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2504 /* Treat all objects with destructors as used; the destructor may do
2505 something substantive. */
2508 if (TREE_CODE (type) == ARRAY_TYPE)
2511 temp = build_address (decl);
2512 temp = build_delete (TREE_TYPE (temp), temp,
2513 sfk_complete_destructor,
2514 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2518 /* Returns the initialization guard variable for the variable DECL,
2519 which has static storage duration. */
2522 get_guard (tree decl)
2527 sname = mangle_guard_variable (decl);
2528 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2533 /* We use a type that is big enough to contain a mutex as well
2534 as an integer counter. */
2535 guard_type = targetm.cxx.guard_type ();
2536 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2537 VAR_DECL, sname, guard_type);
2539 /* The guard should have the same linkage as what it guards. */
2540 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2541 TREE_STATIC (guard) = TREE_STATIC (decl);
2542 DECL_COMMON (guard) = DECL_COMMON (decl);
2543 DECL_COMDAT_GROUP (guard) = DECL_COMDAT_GROUP (decl);
2544 if (TREE_PUBLIC (decl))
2545 DECL_WEAK (guard) = DECL_WEAK (decl);
2546 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2547 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2549 DECL_ARTIFICIAL (guard) = 1;
2550 DECL_IGNORED_P (guard) = 1;
2551 TREE_USED (guard) = 1;
2552 pushdecl_top_level_and_finish (guard, NULL_TREE);
2557 /* Return those bits of the GUARD variable that should be set when the
2558 guarded entity is actually initialized. */
2561 get_guard_bits (tree guard)
2563 if (!targetm.cxx.guard_mask_bit ())
2565 /* We only set the first byte of the guard, in order to leave room
2566 for a mutex in the high-order bits. */
2567 guard = build1 (ADDR_EXPR,
2568 build_pointer_type (TREE_TYPE (guard)),
2570 guard = build1 (NOP_EXPR,
2571 build_pointer_type (char_type_node),
2573 guard = build1 (INDIRECT_REF, char_type_node, guard);
2579 /* Return an expression which determines whether or not the GUARD
2580 variable has already been initialized. */
2583 get_guard_cond (tree guard)
2587 /* Check to see if the GUARD is zero. */
2588 guard = get_guard_bits (guard);
2590 /* Mask off all but the low bit. */
2591 if (targetm.cxx.guard_mask_bit ())
2593 guard_value = integer_one_node;
2594 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2595 guard_value = convert (TREE_TYPE (guard), guard_value);
2596 guard = cp_build_binary_op (input_location,
2597 BIT_AND_EXPR, guard, guard_value,
2598 tf_warning_or_error);
2601 guard_value = integer_zero_node;
2602 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2603 guard_value = convert (TREE_TYPE (guard), guard_value);
2604 return cp_build_binary_op (input_location,
2605 EQ_EXPR, guard, guard_value,
2606 tf_warning_or_error);
2609 /* Return an expression which sets the GUARD variable, indicating that
2610 the variable being guarded has been initialized. */
2613 set_guard (tree guard)
2617 /* Set the GUARD to one. */
2618 guard = get_guard_bits (guard);
2619 guard_init = integer_one_node;
2620 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2621 guard_init = convert (TREE_TYPE (guard), guard_init);
2622 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2623 tf_warning_or_error);
2626 /* Start the process of running a particular set of global constructors
2627 or destructors. Subroutine of do_[cd]tors. */
2630 start_objects (int method_type, int initp)
2636 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2638 if (initp != DEFAULT_INIT_PRIORITY)
2648 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2651 sprintf (type, "%c", method_type);
2653 fndecl = build_lang_decl (FUNCTION_DECL,
2654 get_file_function_name (type),
2655 build_function_type (void_type_node,
2657 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2659 TREE_PUBLIC (current_function_decl) = 0;
2661 /* Mark as artificial because it's not explicitly in the user's
2663 DECL_ARTIFICIAL (current_function_decl) = 1;
2665 /* Mark this declaration as used to avoid spurious warnings. */
2666 TREE_USED (current_function_decl) = 1;
2668 /* Mark this function as a global constructor or destructor. */
2669 if (method_type == 'I')
2670 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2672 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2674 body = begin_compound_stmt (BCS_FN_BODY);
2679 /* Finish the process of running a particular set of global constructors
2680 or destructors. Subroutine of do_[cd]tors. */
2683 finish_objects (int method_type, int initp, tree body)
2688 finish_compound_stmt (body);
2689 fn = finish_function (0);
2691 if (method_type == 'I')
2693 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2694 decl_init_priority_insert (fn, initp);
2698 DECL_STATIC_DESTRUCTOR (fn) = 1;
2699 decl_fini_priority_insert (fn, initp);
2702 expand_or_defer_fn (fn);
2705 /* The names of the parameters to the function created to handle
2706 initializations and destructions for objects with static storage
2708 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2709 #define PRIORITY_IDENTIFIER "__priority"
2711 /* The name of the function we create to handle initializations and
2712 destructions for objects with static storage duration. */
2713 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2715 /* The declaration for the __INITIALIZE_P argument. */
2716 static GTY(()) tree initialize_p_decl;
2718 /* The declaration for the __PRIORITY argument. */
2719 static GTY(()) tree priority_decl;
2721 /* The declaration for the static storage duration function. */
2722 static GTY(()) tree ssdf_decl;
2724 /* All the static storage duration functions created in this
2725 translation unit. */
2726 static GTY(()) VEC(tree,gc) *ssdf_decls;
2728 /* A map from priority levels to information about that priority
2729 level. There may be many such levels, so efficient lookup is
2731 static splay_tree priority_info_map;
2733 /* Begins the generation of the function that will handle all
2734 initialization and destruction of objects with static storage
2735 duration. The function generated takes two parameters of type
2736 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2737 nonzero, it performs initializations. Otherwise, it performs
2738 destructions. It only performs those initializations or
2739 destructions with the indicated __PRIORITY. The generated function
2742 It is assumed that this function will only be called once per
2743 translation unit. */
2746 start_static_storage_duration_function (unsigned count)
2751 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2753 /* Create the identifier for this function. It will be of the form
2754 SSDF_IDENTIFIER_<number>. */
2755 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2757 /* Create the parameters. */
2758 parm_types = void_list_node;
2759 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2760 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2761 type = build_function_type (void_type_node, parm_types);
2763 /* Create the FUNCTION_DECL itself. */
2764 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2765 get_identifier (id),
2767 TREE_PUBLIC (ssdf_decl) = 0;
2768 DECL_ARTIFICIAL (ssdf_decl) = 1;
2770 /* Put this function in the list of functions to be called from the
2771 static constructors and destructors. */
2774 ssdf_decls = VEC_alloc (tree, gc, 32);
2776 /* Take this opportunity to initialize the map from priority
2777 numbers to information about that priority level. */
2778 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2779 /*delete_key_fn=*/0,
2780 /*delete_value_fn=*/
2781 (splay_tree_delete_value_fn) &free);
2783 /* We always need to generate functions for the
2784 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2785 priorities later, we'll be sure to find the
2786 DEFAULT_INIT_PRIORITY. */
2787 get_priority_info (DEFAULT_INIT_PRIORITY);
2790 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2792 /* Create the argument list. */
2793 initialize_p_decl = cp_build_parm_decl
2794 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2795 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2796 TREE_USED (initialize_p_decl) = 1;
2797 priority_decl = cp_build_parm_decl
2798 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2799 DECL_CONTEXT (priority_decl) = ssdf_decl;
2800 TREE_USED (priority_decl) = 1;
2802 TREE_CHAIN (initialize_p_decl) = priority_decl;
2803 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2805 /* Put the function in the global scope. */
2806 pushdecl (ssdf_decl);
2808 /* Start the function itself. This is equivalent to declaring the
2811 static void __ssdf (int __initialize_p, init __priority_p);
2813 It is static because we only need to call this function from the
2814 various constructor and destructor functions for this module. */
2815 start_preparsed_function (ssdf_decl,
2816 /*attrs=*/NULL_TREE,
2819 /* Set up the scope of the outermost block in the function. */
2820 body = begin_compound_stmt (BCS_FN_BODY);
2825 /* Finish the generation of the function which performs initialization
2826 and destruction of objects with static storage duration. After
2827 this point, no more such objects can be created. */
2830 finish_static_storage_duration_function (tree body)
2832 /* Close out the function. */
2833 finish_compound_stmt (body);
2834 expand_or_defer_fn (finish_function (0));
2837 /* Return the information about the indicated PRIORITY level. If no
2838 code to handle this level has yet been generated, generate the
2839 appropriate prologue. */
2841 static priority_info
2842 get_priority_info (int priority)
2847 n = splay_tree_lookup (priority_info_map,
2848 (splay_tree_key) priority);
2851 /* Create a new priority information structure, and insert it
2853 pi = XNEW (struct priority_info_s);
2854 pi->initializations_p = 0;
2855 pi->destructions_p = 0;
2856 splay_tree_insert (priority_info_map,
2857 (splay_tree_key) priority,
2858 (splay_tree_value) pi);
2861 pi = (priority_info) n->value;
2866 /* The effective initialization priority of a DECL. */
2868 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2869 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2870 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2872 /* Whether a DECL needs a guard to protect it against multiple
2875 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2876 || DECL_ONE_ONLY (decl) \
2877 || DECL_WEAK (decl)))
2879 /* Called from one_static_initialization_or_destruction(),
2881 Walks the initializer list of a global variable and looks for
2882 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2883 and that have their DECL_CONTEXT() == NULL.
2884 For each such temporary variable, set their DECL_CONTEXT() to
2885 the current function. This is necessary because otherwise
2886 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2887 when trying to refer to a temporary variable that does not have
2888 it's DECL_CONTECT() properly set. */
2890 fix_temporary_vars_context_r (tree *node,
2891 int *unused ATTRIBUTE_UNUSED,
2892 void *unused1 ATTRIBUTE_UNUSED)
2894 gcc_assert (current_function_decl);
2896 if (TREE_CODE (*node) == BIND_EXPR)
2900 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2901 if (TREE_CODE (var) == VAR_DECL
2903 && DECL_ARTIFICIAL (var)
2904 && !DECL_CONTEXT (var))
2905 DECL_CONTEXT (var) = current_function_decl;
2911 /* Set up to handle the initialization or destruction of DECL. If
2912 INITP is nonzero, we are initializing the variable. Otherwise, we
2913 are destroying it. */
2916 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2918 tree guard_if_stmt = NULL_TREE;
2921 /* If we are supposed to destruct and there's a trivial destructor,
2922 nothing has to be done. */
2924 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2927 /* Trick the compiler into thinking we are at the file and line
2928 where DECL was declared so that error-messages make sense, and so
2929 that the debugger will show somewhat sensible file and line
2931 input_location = DECL_SOURCE_LOCATION (decl);
2933 /* Make sure temporary variables in the initialiser all have
2934 their DECL_CONTEXT() set to a value different from NULL_TREE.
2935 This can happen when global variables initialisers are built.
2936 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2937 the temporary variables that might have been generated in the
2938 accompagning initialisers is NULL_TREE, meaning the variables have been
2939 declared in the global namespace.
2940 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2941 of the temporaries are set to the current function decl. */
2942 cp_walk_tree_without_duplicates (&init,
2943 fix_temporary_vars_context_r,
2950 Access control for implicit calls to the constructors,
2951 the conversion functions, or the destructor called to
2952 create and destroy a static data member is performed as
2953 if these calls appeared in the scope of the member's
2956 we pretend we are in a static member function of the class of
2957 which the DECL is a member. */
2958 if (member_p (decl))
2960 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2961 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2964 /* Assume we don't need a guard. */
2966 /* We need a guard if this is an object with external linkage that
2967 might be initialized in more than one place. (For example, a
2968 static data member of a template, when the data member requires
2970 if (NEEDS_GUARD_P (decl))
2974 guard = get_guard (decl);
2976 /* When using __cxa_atexit, we just check the GUARD as we would
2977 for a local static. */
2978 if (flag_use_cxa_atexit)
2980 /* When using __cxa_atexit, we never try to destroy
2981 anything from a static destructor. */
2983 guard_cond = get_guard_cond (guard);
2985 /* If we don't have __cxa_atexit, then we will be running
2986 destructors from .fini sections, or their equivalents. So,
2987 we need to know how many times we've tried to initialize this
2988 object. We do initializations only if the GUARD is zero,
2989 i.e., if we are the first to initialize the variable. We do
2990 destructions only if the GUARD is one, i.e., if we are the
2991 last to destroy the variable. */
2994 = cp_build_binary_op (input_location,
2996 cp_build_unary_op (PREINCREMENT_EXPR,
2999 tf_warning_or_error),
3001 tf_warning_or_error);
3004 = cp_build_binary_op (input_location,
3006 cp_build_unary_op (PREDECREMENT_EXPR,
3009 tf_warning_or_error),
3011 tf_warning_or_error);
3013 guard_if_stmt = begin_if_stmt ();
3014 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3018 /* If we're using __cxa_atexit, we have not already set the GUARD,
3019 so we must do so now. */
3020 if (guard && initp && flag_use_cxa_atexit)
3021 finish_expr_stmt (set_guard (guard));
3023 /* Perform the initialization or destruction. */
3027 finish_expr_stmt (init);
3029 /* If we're using __cxa_atexit, register a function that calls the
3030 destructor for the object. */
3031 if (flag_use_cxa_atexit)
3032 finish_expr_stmt (register_dtor_fn (decl));
3035 finish_expr_stmt (build_cleanup (decl));
3037 /* Finish the guard if-stmt, if necessary. */
3040 finish_then_clause (guard_if_stmt);
3041 finish_if_stmt (guard_if_stmt);
3044 /* Now that we're done with DECL we don't need to pretend to be a
3045 member of its class any longer. */
3046 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3047 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3050 /* Generate code to do the initialization or destruction of the decls in VARS,
3051 a TREE_LIST of VAR_DECL with static storage duration.
3052 Whether initialization or destruction is performed is specified by INITP. */
3055 do_static_initialization_or_destruction (tree vars, bool initp)
3057 tree node, init_if_stmt, cond;
3059 /* Build the outer if-stmt to check for initialization or destruction. */
3060 init_if_stmt = begin_if_stmt ();
3061 cond = initp ? integer_one_node : integer_zero_node;
3062 cond = cp_build_binary_op (input_location,
3066 tf_warning_or_error);
3067 finish_if_stmt_cond (cond, init_if_stmt);
3071 tree decl = TREE_VALUE (node);
3072 tree priority_if_stmt;
3076 /* If we don't need a destructor, there's nothing to do. Avoid
3077 creating a possibly empty if-stmt. */
3078 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3080 node = TREE_CHAIN (node);
3084 /* Remember that we had an initialization or finalization at this
3086 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3087 pi = get_priority_info (priority);
3089 pi->initializations_p = 1;
3091 pi->destructions_p = 1;
3093 /* Conditionalize this initialization on being in the right priority
3094 and being initializing/finalizing appropriately. */
3095 priority_if_stmt = begin_if_stmt ();
3096 cond = cp_build_binary_op (input_location,
3099 build_int_cst (NULL_TREE, priority),
3100 tf_warning_or_error);
3101 finish_if_stmt_cond (cond, priority_if_stmt);
3103 /* Process initializers with same priority. */
3105 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3106 node = TREE_CHAIN (node))
3107 /* Do one initialization or destruction. */
3108 one_static_initialization_or_destruction (TREE_VALUE (node),
3109 TREE_PURPOSE (node), initp);
3111 /* Finish up the priority if-stmt body. */
3112 finish_then_clause (priority_if_stmt);
3113 finish_if_stmt (priority_if_stmt);
3117 /* Finish up the init/destruct if-stmt body. */
3118 finish_then_clause (init_if_stmt);
3119 finish_if_stmt (init_if_stmt);
3122 /* VARS is a list of variables with static storage duration which may
3123 need initialization and/or finalization. Remove those variables
3124 that don't really need to be initialized or finalized, and return
3125 the resulting list. The order in which the variables appear in
3126 VARS is in reverse order of the order in which they should actually
3127 be initialized. The list we return is in the unreversed order;
3128 i.e., the first variable should be initialized first. */
3131 prune_vars_needing_no_initialization (tree *vars)
3134 tree result = NULL_TREE;
3139 tree decl = TREE_VALUE (t);
3140 tree init = TREE_PURPOSE (t);
3142 /* Deal gracefully with error. */
3143 if (decl == error_mark_node)
3145 var = &TREE_CHAIN (t);
3149 /* The only things that can be initialized are variables. */
3150 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3152 /* If this object is not defined, we don't need to do anything
3154 if (DECL_EXTERNAL (decl))
3156 var = &TREE_CHAIN (t);
3160 /* Also, if the initializer already contains errors, we can bail
3162 if (init && TREE_CODE (init) == TREE_LIST
3163 && value_member (error_mark_node, init))
3165 var = &TREE_CHAIN (t);
3169 /* This variable is going to need initialization and/or
3170 finalization, so we add it to the list. */
3171 *var = TREE_CHAIN (t);
3172 TREE_CHAIN (t) = result;
3179 /* Make sure we have told the back end about all the variables in
3183 write_out_vars (tree vars)
3187 for (v = vars; v; v = TREE_CHAIN (v))
3189 tree var = TREE_VALUE (v);
3190 if (!var_finalized_p (var))
3192 import_export_decl (var);
3193 rest_of_decl_compilation (var, 1, 1);
3198 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3199 (otherwise) that will initialize all global objects with static
3200 storage duration having the indicated PRIORITY. */
3203 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3212 input_location = *locus;
3214 /* Was: locus->line++; */
3216 /* We use `I' to indicate initialization and `D' to indicate
3218 function_key = constructor_p ? 'I' : 'D';
3220 /* We emit the function lazily, to avoid generating empty
3221 global constructors and destructors. */
3224 /* For Objective-C++, we may need to initialize metadata found in this module.
3225 This must be done _before_ any other static initializations. */
3226 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3227 && constructor_p && objc_static_init_needed_p ())
3229 body = start_objects (function_key, priority);
3230 objc_generate_static_init_call (NULL_TREE);
3233 /* Call the static storage duration function with appropriate
3235 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3237 /* Calls to pure or const functions will expand to nothing. */
3238 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3241 body = start_objects (function_key, priority);
3243 arguments = tree_cons (NULL_TREE,
3244 build_int_cst (NULL_TREE, priority),
3246 arguments = tree_cons (NULL_TREE,
3247 build_int_cst (NULL_TREE, constructor_p),
3249 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3250 tf_warning_or_error));
3254 /* Close out the function. */
3256 finish_objects (function_key, priority, body);
3259 /* Generate constructor and destructor functions for the priority
3263 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3265 location_t *locus = (location_t *) data;
3266 int priority = (int) n->key;
3267 priority_info pi = (priority_info) n->value;
3269 /* Generate the functions themselves, but only if they are really
3271 if (pi->initializations_p)
3272 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3273 if (pi->destructions_p)
3274 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3276 /* Keep iterating. */
3280 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3281 decls referenced from front-end specific constructs; it will be called
3282 only for language-specific tree nodes.
3284 Here we must deal with member pointers. */
3287 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3291 switch (TREE_CODE (t))
3294 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3295 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3298 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3299 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3302 if (DECL_VTABLE_OR_VTT_P (t))
3304 /* The ABI requires that all virtual tables be emitted
3305 whenever one of them is. */
3307 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3309 vtbl = TREE_CHAIN (vtbl))
3310 mark_decl_referenced (vtbl);
3312 else if (DECL_CONTEXT (t)
3313 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3314 /* If we need a static variable in a function, then we
3315 need the containing function. */
3316 mark_decl_referenced (DECL_CONTEXT (t));
3325 /* Java requires that we be able to reference a local address for a
3326 method, and not be confused by PLT entries. If hidden aliases are
3327 supported, collect and return all the functions for which we should
3328 emit a hidden alias. */
3330 static struct pointer_set_t *
3331 collect_candidates_for_java_method_aliases (void)
3333 struct cgraph_node *node;
3334 struct pointer_set_t *candidates = NULL;
3336 #ifndef HAVE_GAS_HIDDEN
3340 for (node = cgraph_nodes; node ; node = node->next)
3342 tree fndecl = node->decl;
3344 if (DECL_CONTEXT (fndecl)
3345 && TYPE_P (DECL_CONTEXT (fndecl))
3346 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3347 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3349 if (candidates == NULL)
3350 candidates = pointer_set_create ();
3351 pointer_set_insert (candidates, fndecl);
3359 /* Java requires that we be able to reference a local address for a
3360 method, and not be confused by PLT entries. If hidden aliases are
3361 supported, emit one for each java function that we've emitted.
3362 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3363 by collect_candidates_for_java_method_aliases. */
3366 build_java_method_aliases (struct pointer_set_t *candidates)
3368 struct cgraph_node *node;
3370 #ifndef HAVE_GAS_HIDDEN
3374 for (node = cgraph_nodes; node ; node = node->next)
3376 tree fndecl = node->decl;
3378 if (TREE_ASM_WRITTEN (fndecl)
3379 && pointer_set_contains (candidates, fndecl))
3381 /* Mangle the name in a predictable way; we need to reference
3382 this from a java compiled object file. */
3383 tree oid, nid, alias;
3387 oid = DECL_ASSEMBLER_NAME (fndecl);
3388 oname = IDENTIFIER_POINTER (oid);
3389 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3390 nname = ACONCAT (("_ZGA", oname+2, NULL));
3391 nid = get_identifier (nname);
3393 alias = make_alias_for (fndecl, nid);
3394 TREE_PUBLIC (alias) = 1;
3395 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3397 assemble_alias (alias, oid);
3402 /* Returns true iff there is a definition available for variable or
3406 decl_defined_p (tree decl)
3408 if (TREE_CODE (decl) == FUNCTION_DECL)
3409 return (DECL_INITIAL (decl) != NULL_TREE);
3412 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3413 return !DECL_EXTERNAL (decl);
3417 /* Complain that DECL uses a type with no linkage but is never defined. */
3420 no_linkage_error (tree decl)
3422 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3423 if (TYPE_ANONYMOUS_P (t))
3425 permerror (0, "%q+#D, declared using anonymous type, "
3426 "is used but never defined", decl);
3427 if (is_typedef_decl (TYPE_NAME (t)))
3428 permerror (0, "%q+#D does not refer to the unqualified type, "
3429 "so it is not used for linkage", TYPE_NAME (t));
3432 permerror (0, "%q+#D, declared using local type %qT, "
3433 "is used but never defined", decl, t);
3436 /* This routine is called at the end of compilation.
3437 Its job is to create all the code needed to initialize and
3438 destroy the global aggregates. We do the destruction
3439 first, since that way we only need to reverse the decls once. */
3442 cp_write_global_declarations (void)
3448 unsigned ssdf_count = 0;
3451 struct pointer_set_t *candidates;
3453 locus = input_location;
3456 /* Bad parse errors. Just forget about it. */
3457 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3461 c_common_write_pch ();
3463 /* FIXME - huh? was input_line -= 1;*/
3465 /* We now have to write out all the stuff we put off writing out.
3468 o Template specializations that we have not yet instantiated,
3469 but which are needed.
3470 o Initialization and destruction for non-local objects with
3471 static storage duration. (Local objects with static storage
3472 duration are initialized when their scope is first entered,
3473 and are cleaned up via atexit.)
3474 o Virtual function tables.
3476 All of these may cause others to be needed. For example,
3477 instantiating one function may cause another to be needed, and
3478 generating the initializer for an object may cause templates to be
3479 instantiated, etc., etc. */
3481 timevar_push (TV_VARCONST);
3483 emit_support_tinfos ();
3492 /* If there are templates that we've put off instantiating, do
3494 instantiate_pending_templates (retries);
3497 /* Write out virtual tables as required. Note that writing out
3498 the virtual table for a template class may cause the
3499 instantiation of members of that class. If we write out
3500 vtables then we remove the class from our list so we don't
3501 have to look at it again. */
3503 while (keyed_classes != NULL_TREE
3504 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3507 keyed_classes = TREE_CHAIN (keyed_classes);
3513 tree next = TREE_CHAIN (t);
3517 if (maybe_emit_vtables (TREE_VALUE (next)))
3520 TREE_CHAIN (t) = TREE_CHAIN (next);
3525 next = TREE_CHAIN (t);
3529 /* Write out needed type info variables. We have to be careful
3530 looping through unemitted decls, because emit_tinfo_decl may
3531 cause other variables to be needed. New elements will be
3532 appended, and we remove from the vector those that actually
3534 for (i = VEC_length (tree, unemitted_tinfo_decls);
3535 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3536 if (emit_tinfo_decl (t))
3539 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3542 /* The list of objects with static storage duration is built up
3543 in reverse order. We clear STATIC_AGGREGATES so that any new
3544 aggregates added during the initialization of these will be
3545 initialized in the correct order when we next come around the
3547 vars = prune_vars_needing_no_initialization (&static_aggregates);
3551 /* We need to start a new initialization function each time
3552 through the loop. That's because we need to know which
3553 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3554 isn't computed until a function is finished, and written
3555 out. That's a deficiency in the back end. When this is
3556 fixed, these initialization functions could all become
3557 inline, with resulting performance improvements. */
3560 /* Set the line and file, so that it is obviously not from
3562 input_location = locus;
3563 ssdf_body = start_static_storage_duration_function (ssdf_count);
3565 /* Make sure the back end knows about all the variables. */
3566 write_out_vars (vars);
3568 /* First generate code to do all the initializations. */
3570 do_static_initialization_or_destruction (vars, /*initp=*/true);
3572 /* Then, generate code to do all the destructions. Do these
3573 in reverse order so that the most recently constructed
3574 variable is the first destroyed. If we're using
3575 __cxa_atexit, then we don't need to do this; functions
3576 were registered at initialization time to destroy the
3578 if (!flag_use_cxa_atexit && vars)
3580 vars = nreverse (vars);
3581 do_static_initialization_or_destruction (vars, /*initp=*/false);
3586 /* Finish up the static storage duration function for this
3588 input_location = locus;
3589 finish_static_storage_duration_function (ssdf_body);
3591 /* All those initializations and finalizations might cause
3592 us to need more inline functions, more template
3593 instantiations, etc. */
3596 /* ??? was: locus.line++; */
3599 /* Go through the set of inline functions whose bodies have not
3600 been emitted yet. If out-of-line copies of these functions
3601 are required, emit them. */
3602 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3604 /* Does it need synthesizing? */
3605 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3606 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3608 /* Even though we're already at the top-level, we push
3609 there again. That way, when we pop back a few lines
3610 hence, all of our state is restored. Otherwise,
3611 finish_function doesn't clean things up, and we end
3612 up with CURRENT_FUNCTION_DECL set. */
3613 push_to_top_level ();
3614 /* The decl's location will mark where it was first
3615 needed. Save that so synthesize method can indicate
3616 where it was needed from, in case of error */
3617 input_location = DECL_SOURCE_LOCATION (decl);
3618 synthesize_method (decl);
3619 pop_from_top_level ();
3623 if (!DECL_SAVED_TREE (decl))
3626 /* We lie to the back end, pretending that some functions
3627 are not defined when they really are. This keeps these
3628 functions from being put out unnecessarily. But, we must
3629 stop lying when the functions are referenced, or if they
3630 are not comdat since they need to be put out now. If
3631 DECL_INTERFACE_KNOWN, then we have already set
3632 DECL_EXTERNAL appropriately, so there's no need to check
3633 again, and we do not want to clear DECL_EXTERNAL if a
3634 previous call to import_export_decl set it.
3636 This is done in a separate for cycle, because if some
3637 deferred function is contained in another deferred
3638 function later in deferred_fns varray,
3639 rest_of_compilation would skip this function and we
3640 really cannot expand the same function twice. */
3641 import_export_decl (decl);
3642 if (DECL_NOT_REALLY_EXTERN (decl)
3643 && DECL_INITIAL (decl)
3644 && decl_needed_p (decl))
3645 DECL_EXTERNAL (decl) = 0;
3647 /* If we're going to need to write this function out, and
3648 there's already a body for it, create RTL for it now.
3649 (There might be no body if this is a method we haven't
3650 gotten around to synthesizing yet.) */
3651 if (!DECL_EXTERNAL (decl)
3652 && decl_needed_p (decl)
3653 && !TREE_ASM_WRITTEN (decl)
3654 && !cgraph_node (decl)->local.finalized)
3656 /* We will output the function; no longer consider it in this
3658 DECL_DEFER_OUTPUT (decl) = 0;
3659 /* Generate RTL for this function now that we know we
3661 expand_or_defer_fn (decl);
3662 /* If we're compiling -fsyntax-only pretend that this
3663 function has been written out so that we don't try to
3665 if (flag_syntax_only)
3666 TREE_ASM_WRITTEN (decl) = 1;
3671 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3674 /* Static data members are just like namespace-scope globals. */
3675 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3677 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3678 /* Don't write it out if we haven't seen a definition. */
3679 || DECL_IN_AGGR_P (decl))
3681 import_export_decl (decl);
3682 /* If this static data member is needed, provide it to the
3684 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3685 DECL_EXTERNAL (decl) = 0;
3687 if (VEC_length (tree, pending_statics) != 0
3688 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3689 VEC_length (tree, pending_statics)))
3696 /* All used inline functions must have a definition at this point. */
3697 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3699 if (/* Check online inline functions that were actually used. */
3700 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3701 /* If the definition actually was available here, then the
3702 fact that the function was not defined merely represents
3703 that for some reason (use of a template repository,
3704 #pragma interface, etc.) we decided not to emit the
3706 && !DECL_INITIAL (decl)
3707 /* An explicit instantiation can be used to specify
3708 that the body is in another unit. It will have
3709 already verified there was a definition. */
3710 && !DECL_EXPLICIT_INSTANTIATION (decl))
3712 warning (0, "inline function %q+D used but never defined", decl);
3713 /* Avoid a duplicate warning from check_global_declaration_1. */
3714 TREE_NO_WARNING (decl) = 1;
3718 /* So must decls that use a type with no linkage. */
3719 for (i = 0; VEC_iterate (tree, no_linkage_decls, i, decl); ++i)
3720 if (!decl_defined_p (decl))
3721 no_linkage_error (decl);
3723 /* We give C linkage to static constructors and destructors. */
3724 push_lang_context (lang_name_c);
3726 /* Generate initialization and destruction functions for all
3727 priorities for which they are required. */
3728 if (priority_info_map)
3729 splay_tree_foreach (priority_info_map,
3730 generate_ctor_and_dtor_functions_for_priority,
3732 else if (c_dialect_objc () && objc_static_init_needed_p ())
3733 /* If this is obj-c++ and we need a static init, call
3734 generate_ctor_or_dtor_function. */
3735 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3736 DEFAULT_INIT_PRIORITY, &locus);
3738 /* We're done with the splay-tree now. */
3739 if (priority_info_map)
3740 splay_tree_delete (priority_info_map);
3742 /* Generate any missing aliases. */
3743 maybe_apply_pending_pragma_weaks ();
3745 /* We're done with static constructors, so we can go back to "C++"
3747 pop_lang_context ();
3749 /* Collect candidates for Java hidden aliases. */
3750 candidates = collect_candidates_for_java_method_aliases ();
3752 cgraph_finalize_compilation_unit ();
3754 /* Now, issue warnings about static, but not defined, functions,
3755 etc., and emit debugging information. */
3756 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3757 if (VEC_length (tree, pending_statics) != 0)
3759 check_global_declarations (VEC_address (tree, pending_statics),
3760 VEC_length (tree, pending_statics));
3761 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3762 VEC_length (tree, pending_statics));
3765 /* Generate hidden aliases for Java. */
3768 build_java_method_aliases (candidates);
3769 pointer_set_destroy (candidates);
3774 /* The entire file is now complete. If requested, dump everything
3778 FILE *stream = dump_begin (TDI_tu, &flags);
3782 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3783 dump_end (TDI_tu, stream);
3787 timevar_pop (TV_VARCONST);
3789 if (flag_detailed_statistics)
3791 dump_tree_statistics ();
3792 dump_time_statistics ();
3794 input_location = locus;
3796 #ifdef ENABLE_CHECKING
3797 validate_conversion_obstack ();
3798 #endif /* ENABLE_CHECKING */
3801 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3802 function to call in parse-tree form; it has not yet been
3803 semantically analyzed. ARGS are the arguments to the function.
3804 They have already been semantically analyzed. This may change
3808 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
3811 VEC(tree,gc) *orig_args = NULL;
3816 object = TREE_OPERAND (fn, 0);
3818 if (processing_template_decl)
3820 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3821 || TREE_CODE (fn) == MEMBER_REF);
3822 if (type_dependent_expression_p (fn)
3823 || any_type_dependent_arguments_p (*args))
3824 return build_nt_call_vec (fn, *args);
3826 orig_args = make_tree_vector_copy (*args);
3828 /* Transform the arguments and add the implicit "this"
3829 parameter. That must be done before the FN is transformed
3830 because we depend on the form of FN. */
3831 make_args_non_dependent (*args);
3832 object = build_non_dependent_expr (object);
3833 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3834 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3835 VEC_safe_insert (tree, gc, *args, 0, object);
3836 /* Now that the arguments are done, transform FN. */
3837 fn = build_non_dependent_expr (fn);
3840 /* A qualified name corresponding to a bound pointer-to-member is
3841 represented as an OFFSET_REF:
3843 struct B { void g(); };
3845 void B::g() { (this->*p)(); } */
3846 if (TREE_CODE (fn) == OFFSET_REF)
3848 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3849 tf_warning_or_error);
3850 fn = TREE_OPERAND (fn, 1);
3851 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3852 VEC_safe_insert (tree, gc, *args, 0, object_addr);
3855 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
3856 if (processing_template_decl && expr != error_mark_node)
3857 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
3859 if (orig_args != NULL)
3860 release_tree_vector (orig_args);
3867 check_default_args (tree x)
3869 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3870 bool saw_def = false;
3871 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3872 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3874 if (TREE_PURPOSE (arg))
3878 error ("default argument missing for parameter %P of %q+#D", i, x);
3879 TREE_PURPOSE (arg) = error_mark_node;
3884 /* Return true if function DECL can be inlined. This is used to force
3885 instantiation of methods that might be interesting for inlining. */
3887 possibly_inlined_p (tree decl)
3889 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3890 if (DECL_UNINLINABLE (decl))
3892 if (!optimize || pragma_java_exceptions)
3893 return DECL_DECLARED_INLINE_P (decl);
3894 /* When optimizing, we might inline everything when flatten
3895 attribute or heuristics inlining for size or autoinlining
3900 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3901 If DECL is a specialization or implicitly declared class member,
3902 generate the actual definition. */
3905 mark_used (tree decl)
3907 HOST_WIDE_INT saved_processing_template_decl = 0;
3909 /* If DECL is a BASELINK for a single function, then treat it just
3910 like the DECL for the function. Otherwise, if the BASELINK is
3911 for an overloaded function, we don't know which function was
3912 actually used until after overload resolution. */
3913 if (TREE_CODE (decl) == BASELINK)
3915 decl = BASELINK_FUNCTIONS (decl);
3916 if (really_overloaded_fn (decl))
3918 decl = OVL_CURRENT (decl);
3921 /* Set TREE_USED for the benefit of -Wunused. */
3922 TREE_USED (decl) = 1;
3923 if (DECL_CLONED_FUNCTION_P (decl))
3924 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3926 if (TREE_CODE (decl) == FUNCTION_DECL
3927 && DECL_DELETED_FN (decl))
3929 error ("deleted function %q+D", decl);
3930 error ("used here");
3933 /* If we don't need a value, then we don't need to synthesize DECL. */
3934 if (cp_unevaluated_operand != 0)
3937 /* We can only check DECL_ODR_USED on variables or functions with
3938 DECL_LANG_SPECIFIC set, and these are also the only decls that we
3939 might need special handling for. */
3940 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
3941 || DECL_LANG_SPECIFIC (decl) == NULL
3942 || DECL_THUNK_P (decl))
3945 /* We only want to do this processing once. We don't need to keep trying
3946 to instantiate inline templates, because unit-at-a-time will make sure
3947 we get them compiled before functions that want to inline them. */
3948 if (DECL_ODR_USED (decl))
3951 /* If within finish_function, defer the rest until that function
3952 finishes, otherwise it might recurse. */
3953 if (defer_mark_used_calls)
3955 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
3959 /* Normally, we can wait until instantiation-time to synthesize
3960 DECL. However, if DECL is a static data member initialized with
3961 a constant, we need the value right now because a reference to
3962 such a data member is not value-dependent. */
3963 if (TREE_CODE (decl) == VAR_DECL
3964 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3965 && DECL_CLASS_SCOPE_P (decl))
3967 /* Don't try to instantiate members of dependent types. We
3968 cannot just use dependent_type_p here because this function
3969 may be called from fold_non_dependent_expr, and then we may
3970 see dependent types, even though processing_template_decl
3972 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3973 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3975 /* Pretend that we are not in a template, even if we are, so
3976 that the static data member initializer will be processed. */
3977 saved_processing_template_decl = processing_template_decl;
3978 processing_template_decl = 0;
3981 if (processing_template_decl)
3984 DECL_ODR_USED (decl) = 1;
3985 if (DECL_CLONED_FUNCTION_P (decl))
3986 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3988 /* DR 757: A type without linkage shall not be used as the type of a
3989 variable or function with linkage, unless
3990 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
3991 o the variable or function is not used (3.2 [basic.def.odr]) or is
3992 defined in the same translation unit. */
3993 if (cxx_dialect > cxx98
3994 && decl_linkage (decl) != lk_none
3995 && !DECL_EXTERN_C_P (decl)
3996 && !DECL_ARTIFICIAL (decl)
3997 && !decl_defined_p (decl)
3998 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4000 if (is_local_extern (decl))
4001 /* There's no way to define a local extern, and adding it to
4002 the vector interferes with GC, so give an error now. */
4003 no_linkage_error (decl);
4005 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4008 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4009 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4010 /* Remember it, so we can check it was defined. */
4011 note_vague_linkage_fn (decl);
4013 /* Is it a synthesized method that needs to be synthesized? */
4014 if (TREE_CODE (decl) == FUNCTION_DECL
4015 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4016 && DECL_DEFAULTED_FN (decl)
4017 && ! DECL_INITIAL (decl))
4019 /* Remember the current location for a function we will end up
4020 synthesizing. Then we can inform the user where it was
4021 required in the case of error. */
4022 DECL_SOURCE_LOCATION (decl) = input_location;
4024 /* Synthesizing an implicitly defined member function will result in
4025 garbage collection. We must treat this situation as if we were
4026 within the body of a function so as to avoid collecting live data
4027 on the stack (such as overload resolution candidates).
4029 We could just let cp_write_global_declarations handle synthesizing
4030 this function, since we just added it to deferred_fns, but doing
4031 it at the use site produces better error messages. */
4033 synthesize_method (decl);
4035 /* If this is a synthesized method we don't need to
4036 do the instantiation test below. */
4038 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4039 && DECL_TEMPLATE_INFO (decl)
4040 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4041 || always_instantiate_p (decl)))
4042 /* If this is a function or variable that is an instance of some
4043 template, we now know that we will need to actually do the
4044 instantiation. We check that DECL is not an explicit
4045 instantiation because that is not checked in instantiate_decl.
4047 We put off instantiating functions in order to improve compile
4048 times. Maintaining a stack of active functions is expensive,
4049 and the inliner knows to instantiate any functions it might
4050 need. Therefore, we always try to defer instantiation. */
4051 instantiate_decl (decl, /*defer_ok=*/true,
4052 /*expl_inst_class_mem_p=*/false);
4054 processing_template_decl = saved_processing_template_decl;
4057 #include "gt-cp-decl2.h"