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;
769 && TREE_CODE (init) == TREE_LIST
770 && TREE_VALUE (init) == error_mark_node
771 && TREE_CHAIN (init) == NULL_TREE)
774 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
775 if (! value || error_operand_p (value))
776 /* friend or constructor went bad. */
777 return error_mark_node;
779 if (TREE_CODE (value) == TYPE_DECL && init)
781 error ("typedef %qD is initialized (use __typeof__ instead)", value);
785 /* Pass friendly classes back. */
786 if (value == void_type_node)
789 /* Pass friend decls back. */
790 if ((TREE_CODE (value) == FUNCTION_DECL
791 || TREE_CODE (value) == TEMPLATE_DECL)
792 && DECL_CONTEXT (value) != current_class_type)
795 if (DECL_NAME (value) != NULL_TREE
796 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
797 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
798 error ("member %qD conflicts with virtual function table field name",
801 /* Stash away type declarations. */
802 if (TREE_CODE (value) == TYPE_DECL)
804 DECL_NONLOCAL (value) = 1;
805 DECL_CONTEXT (value) = current_class_type;
807 if (processing_template_decl)
808 value = push_template_decl (value);
814 /* If this is a typedef that names the class for linkage purposes
815 (7.1.3p8), apply any attributes directly to the type. */
816 if (TAGGED_TYPE_P (TREE_TYPE (value))
817 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
818 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
820 cplus_decl_attributes (&value, attrlist, attrflags);
823 if (declspecs->specs[(int)ds_typedef]
824 && TREE_TYPE (value) != error_mark_node
825 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
826 set_underlying_type (value);
831 if (DECL_IN_AGGR_P (value))
833 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
834 return void_type_node;
837 if (asmspec_tree && asmspec_tree != error_mark_node)
838 asmspec = TREE_STRING_POINTER (asmspec_tree);
842 if (TREE_CODE (value) == FUNCTION_DECL)
844 /* Initializers for functions are rejected early in the parser.
845 If we get here, it must be a pure specifier for a method. */
846 if (init == ridpointers[(int)RID_DELETE])
848 DECL_DELETED_FN (value) = 1;
849 DECL_DECLARED_INLINE_P (value) = 1;
850 DECL_INITIAL (value) = error_mark_node;
852 else if (init == ridpointers[(int)RID_DEFAULT])
854 if (!defaultable_fn_p (value))
855 error ("%qD cannot be defaulted", value);
858 DECL_DEFAULTED_FN (value) = 1;
859 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
860 DECL_DECLARED_INLINE_P (value) = 1;
863 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
865 gcc_assert (error_operand_p (init) || integer_zerop (init));
866 DECL_PURE_VIRTUAL_P (value) = 1;
870 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
871 error ("initializer specified for static member function %qD",
875 else if (pedantic && TREE_CODE (value) != VAR_DECL)
876 /* Already complained in grokdeclarator. */
878 else if (!processing_template_decl)
880 if (TREE_CODE (init) == CONSTRUCTOR)
881 init = digest_init (TREE_TYPE (value), init);
883 init = integral_constant_value (init);
885 if (init != error_mark_node && !TREE_CONSTANT (init))
887 /* We can allow references to things that are effectively
888 static, since references are initialized with the
890 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
891 || (TREE_STATIC (init) == 0
892 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
894 error ("field initializer is not constant");
895 init = error_mark_node;
901 if (processing_template_decl
902 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
904 value = push_template_decl (value);
905 if (error_operand_p (value))
906 return error_mark_node;
910 cplus_decl_attributes (&value, attrlist, 0);
912 switch (TREE_CODE (value))
915 finish_static_data_member_decl (value, init, init_const_expr_p,
916 asmspec_tree, flags);
921 error ("%<asm%> specifiers are not permitted on non-static data members");
922 if (DECL_INITIAL (value) == error_mark_node)
923 init = error_mark_node;
924 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
926 DECL_INITIAL (value) = init;
927 DECL_IN_AGGR_P (value) = 1;
932 set_user_assembler_name (value, asmspec);
934 cp_finish_decl (value,
936 /*init_const_expr_p=*/false,
937 asmspec_tree, flags);
939 /* Pass friends back this way. */
940 if (DECL_FRIEND_P (value))
941 return void_type_node;
943 DECL_IN_AGGR_P (value) = 1;
952 /* Like `grokfield', but for bitfields.
953 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
956 grokbitfield (const cp_declarator *declarator,
957 cp_decl_specifier_seq *declspecs, tree width,
960 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
962 if (value == error_mark_node)
963 return NULL_TREE; /* friends went bad. */
965 /* Pass friendly classes back. */
966 if (TREE_CODE (value) == VOID_TYPE)
967 return void_type_node;
969 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
970 && (POINTER_TYPE_P (value)
971 || !dependent_type_p (TREE_TYPE (value))))
973 error ("bit-field %qD with non-integral type", value);
974 return error_mark_node;
977 if (TREE_CODE (value) == TYPE_DECL)
979 error ("cannot declare %qD to be a bit-field type", value);
983 /* Usually, finish_struct_1 catches bitfields with invalid types.
984 But, in the case of bitfields with function type, we confuse
985 ourselves into thinking they are member functions, so we must
987 if (TREE_CODE (value) == FUNCTION_DECL)
989 error ("cannot declare bit-field %qD with function type",
994 if (DECL_IN_AGGR_P (value))
996 error ("%qD is already defined in the class %qT", value,
997 DECL_CONTEXT (value));
998 return void_type_node;
1001 if (TREE_STATIC (value))
1003 error ("static member %qD cannot be a bit-field", value);
1006 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1008 if (width != error_mark_node)
1010 constant_expression_warning (width);
1011 DECL_INITIAL (value) = width;
1012 SET_DECL_C_BIT_FIELD (value);
1015 DECL_IN_AGGR_P (value) = 1;
1018 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1024 /* Returns true iff ATTR is an attribute which needs to be applied at
1025 instantiation time rather than template definition time. */
1028 is_late_template_attribute (tree attr, tree decl)
1030 tree name = TREE_PURPOSE (attr);
1031 tree args = TREE_VALUE (attr);
1032 const struct attribute_spec *spec = lookup_attribute_spec (name);
1036 /* Unknown attribute. */
1039 /* Attribute weak handling wants to write out assembly right away. */
1040 if (is_attribute_p ("weak", name))
1043 /* If any of the arguments are dependent expressions, we can't evaluate
1044 the attribute until instantiation time. */
1045 for (arg = args; arg; arg = TREE_CHAIN (arg))
1047 tree t = TREE_VALUE (arg);
1049 /* If the first attribute argument is an identifier, only consider
1050 second and following arguments. Attributes like mode, format,
1051 cleanup and several target specific attributes aren't late
1052 just because they have an IDENTIFIER_NODE as first argument. */
1053 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1056 if (value_dependent_expression_p (t)
1057 || type_dependent_expression_p (t))
1061 if (TREE_CODE (decl) == TYPE_DECL
1063 || spec->type_required)
1065 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1067 /* We can't apply any attributes to a completely unknown type until
1068 instantiation time. */
1069 enum tree_code code = TREE_CODE (type);
1070 if (code == TEMPLATE_TYPE_PARM
1071 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1072 || code == TYPENAME_TYPE)
1074 /* Also defer most attributes on dependent types. This is not
1075 necessary in all cases, but is the better default. */
1076 else if (dependent_type_p (type)
1077 /* But attribute visibility specifically works on
1079 && !is_attribute_p ("visibility", name))
1088 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1089 applied at instantiation time and return them. If IS_DEPENDENT is true,
1090 the declaration itself is dependent, so all attributes should be applied
1091 at instantiation time. */
1094 splice_template_attributes (tree *attr_p, tree decl)
1097 tree late_attrs = NULL_TREE;
1098 tree *q = &late_attrs;
1105 if (is_late_template_attribute (*p, decl))
1107 ATTR_IS_DEPENDENT (*p) = 1;
1109 *p = TREE_CHAIN (*p);
1110 q = &TREE_CHAIN (*q);
1114 p = &TREE_CHAIN (*p);
1120 /* Remove any late attributes from the list in ATTR_P and attach them to
1124 save_template_attributes (tree *attr_p, tree *decl_p)
1126 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1128 tree old_attrs = NULL_TREE;
1133 if (DECL_P (*decl_p))
1134 q = &DECL_ATTRIBUTES (*decl_p);
1136 q = &TYPE_ATTRIBUTES (*decl_p);
1140 /* Place the late attributes at the beginning of the attribute
1142 TREE_CHAIN (tree_last (late_attrs)) = *q;
1145 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1147 /* We've added new attributes directly to the main variant, so
1148 now we need to update all of the other variants to include
1149 these new attributes. */
1151 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1152 variant = TYPE_NEXT_VARIANT (variant))
1154 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1155 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1160 /* Like reconstruct_complex_type, but handle also template trees. */
1163 cp_reconstruct_complex_type (tree type, tree bottom)
1167 if (TREE_CODE (type) == POINTER_TYPE)
1169 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1170 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1171 TYPE_REF_CAN_ALIAS_ALL (type));
1173 else if (TREE_CODE (type) == REFERENCE_TYPE)
1175 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1176 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1177 TYPE_REF_CAN_ALIAS_ALL (type));
1179 else if (TREE_CODE (type) == ARRAY_TYPE)
1181 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1182 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1183 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1184 element type qualification will be handled by the recursive
1185 cp_reconstruct_complex_type call and cp_build_qualified_type
1186 for ARRAY_TYPEs changes the element type. */
1189 else if (TREE_CODE (type) == FUNCTION_TYPE)
1191 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1192 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1194 else if (TREE_CODE (type) == METHOD_TYPE)
1196 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1197 /* The build_method_type_directly() routine prepends 'this' to argument list,
1198 so we must compensate by getting rid of it. */
1200 = build_method_type_directly
1201 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1203 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1205 else if (TREE_CODE (type) == OFFSET_TYPE)
1207 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1208 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1213 return cp_build_qualified_type (outer, TYPE_QUALS (type));
1216 /* Like decl_attributes, but handle C++ complexity. */
1219 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1221 if (*decl == NULL_TREE || *decl == void_type_node
1222 || *decl == error_mark_node
1223 || attributes == NULL_TREE)
1226 if (processing_template_decl)
1228 if (check_for_bare_parameter_packs (attributes))
1231 save_template_attributes (&attributes, decl);
1232 if (attributes == NULL_TREE)
1236 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1237 decl = &DECL_TEMPLATE_RESULT (*decl);
1239 decl_attributes (decl, attributes, flags);
1241 if (TREE_CODE (*decl) == TYPE_DECL)
1242 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1245 /* Walks through the namespace- or function-scope anonymous union
1246 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1247 Returns one of the fields for use in the mangled name. */
1250 build_anon_union_vars (tree type, tree object)
1252 tree main_decl = NULL_TREE;
1255 /* Rather than write the code to handle the non-union case,
1256 just give an error. */
1257 if (TREE_CODE (type) != UNION_TYPE)
1258 error ("anonymous struct not inside named type");
1260 for (field = TYPE_FIELDS (type);
1262 field = TREE_CHAIN (field))
1267 if (DECL_ARTIFICIAL (field))
1269 if (TREE_CODE (field) != FIELD_DECL)
1271 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1272 "have non-static data members", field);
1276 if (TREE_PRIVATE (field))
1277 permerror (input_location, "private member %q+#D in anonymous union", field);
1278 else if (TREE_PROTECTED (field))
1279 permerror (input_location, "protected member %q+#D in anonymous union", field);
1281 if (processing_template_decl)
1282 ref = build_min_nt (COMPONENT_REF, object,
1283 DECL_NAME (field), NULL_TREE);
1285 ref = build_class_member_access_expr (object, field, NULL_TREE,
1286 false, tf_warning_or_error);
1288 if (DECL_NAME (field))
1292 decl = build_decl (input_location,
1293 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1294 DECL_ANON_UNION_VAR_P (decl) = 1;
1296 base = get_base_address (object);
1297 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1298 TREE_STATIC (decl) = TREE_STATIC (base);
1299 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1301 SET_DECL_VALUE_EXPR (decl, ref);
1302 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1304 decl = pushdecl (decl);
1306 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1307 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1311 if (main_decl == NULL_TREE)
1318 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1319 anonymous union, then all members must be laid out together. PUBLIC_P
1320 is nonzero if this union is not declared static. */
1323 finish_anon_union (tree anon_union_decl)
1329 if (anon_union_decl == error_mark_node)
1332 type = TREE_TYPE (anon_union_decl);
1333 public_p = TREE_PUBLIC (anon_union_decl);
1335 /* The VAR_DECL's context is the same as the TYPE's context. */
1336 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1338 if (TYPE_FIELDS (type) == NULL_TREE)
1343 error ("namespace-scope anonymous aggregates must be static");
1347 main_decl = build_anon_union_vars (type, anon_union_decl);
1348 if (main_decl == error_mark_node)
1350 if (main_decl == NULL_TREE)
1352 warning (0, "anonymous union with no members");
1356 if (!processing_template_decl)
1358 /* Use main_decl to set the mangled name. */
1359 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1360 maybe_commonize_var (anon_union_decl);
1361 mangle_decl (anon_union_decl);
1362 DECL_NAME (anon_union_decl) = NULL_TREE;
1365 pushdecl (anon_union_decl);
1366 if (building_stmt_tree ()
1367 && at_function_scope_p ())
1368 add_decl_expr (anon_union_decl);
1369 else if (!processing_template_decl)
1370 rest_of_decl_compilation (anon_union_decl,
1371 toplevel_bindings_p (), at_eof);
1374 /* Auxiliary functions to make type signatures for
1375 `operator new' and `operator delete' correspond to
1376 what compiler will be expecting. */
1379 coerce_new_type (tree type)
1382 tree args = TYPE_ARG_TYPES (type);
1384 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1386 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1389 error ("%<operator new%> must return type %qT", ptr_type_node);
1392 if (args && args != void_list_node)
1394 if (TREE_PURPOSE (args))
1396 /* [basic.stc.dynamic.allocation]
1398 The first parameter shall not have an associated default
1400 error ("the first parameter of %<operator new%> cannot "
1401 "have a default argument");
1402 /* Throw away the default argument. */
1403 TREE_PURPOSE (args) = NULL_TREE;
1406 if (!same_type_p (TREE_VALUE (args), size_type_node))
1409 args = TREE_CHAIN (args);
1416 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1417 "as first parameter", size_type_node);
1422 args = tree_cons (NULL_TREE, size_type_node, args);
1425 type = build_exception_variant
1426 (build_function_type (ptr_type_node, args),
1427 TYPE_RAISES_EXCEPTIONS (type));
1435 coerce_delete_type (tree type)
1438 tree args = TYPE_ARG_TYPES (type);
1440 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1442 if (!same_type_p (TREE_TYPE (type), void_type_node))
1445 error ("%<operator delete%> must return type %qT", void_type_node);
1448 if (!args || args == void_list_node
1449 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1452 if (args && args != void_list_node)
1453 args = TREE_CHAIN (args);
1454 error ("%<operator delete%> takes type %qT as first parameter",
1460 args = tree_cons (NULL_TREE, ptr_type_node, args);
1463 type = build_exception_variant
1464 (build_function_type (void_type_node, args),
1465 TYPE_RAISES_EXCEPTIONS (type));
1473 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1474 and mark them as needed. */
1477 mark_vtable_entries (tree decl)
1480 unsigned HOST_WIDE_INT idx;
1482 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1487 STRIP_NOPS (fnaddr);
1489 if (TREE_CODE (fnaddr) != ADDR_EXPR
1490 && TREE_CODE (fnaddr) != FDESC_EXPR)
1491 /* This entry is an offset: a virtual base class offset, a
1492 virtual call offset, an RTTI offset, etc. */
1495 fn = TREE_OPERAND (fnaddr, 0);
1496 TREE_ADDRESSABLE (fn) = 1;
1497 /* When we don't have vcall offsets, we output thunks whenever
1498 we output the vtables that contain them. With vcall offsets,
1499 we know all the thunks we'll need when we emit a virtual
1500 function, so we emit the thunks there instead. */
1501 if (DECL_THUNK_P (fn))
1502 use_thunk (fn, /*emit_p=*/0);
1507 /* Set DECL up to have the closest approximation of "initialized common"
1508 linkage available. */
1511 comdat_linkage (tree decl)
1514 make_decl_one_only (decl, cxx_comdat_group (decl));
1515 else if (TREE_CODE (decl) == FUNCTION_DECL
1516 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1517 /* We can just emit function and compiler-generated variables
1518 statically; having multiple copies is (for the most part) only
1521 There are two correctness issues, however: the address of a
1522 template instantiation with external linkage should be the
1523 same, independent of what translation unit asks for the
1524 address, and this will not hold when we emit multiple copies of
1525 the function. However, there's little else we can do.
1527 Also, by default, the typeinfo implementation assumes that
1528 there will be only one copy of the string used as the name for
1529 each type. Therefore, if weak symbols are unavailable, the
1530 run-time library should perform a more conservative check; it
1531 should perform a string comparison, rather than an address
1533 TREE_PUBLIC (decl) = 0;
1536 /* Static data member template instantiations, however, cannot
1537 have multiple copies. */
1538 if (DECL_INITIAL (decl) == 0
1539 || DECL_INITIAL (decl) == error_mark_node)
1540 DECL_COMMON (decl) = 1;
1541 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1543 DECL_COMMON (decl) = 1;
1544 DECL_INITIAL (decl) = error_mark_node;
1546 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1548 /* We can't do anything useful; leave vars for explicit
1550 DECL_EXTERNAL (decl) = 1;
1551 DECL_NOT_REALLY_EXTERN (decl) = 0;
1555 if (DECL_LANG_SPECIFIC (decl))
1556 DECL_COMDAT (decl) = 1;
1559 /* For win32 we also want to put explicit instantiations in
1560 linkonce sections, so that they will be merged with implicit
1561 instantiations; otherwise we get duplicate symbol errors.
1562 For Darwin we do not want explicit instantiations to be
1566 maybe_make_one_only (tree decl)
1568 /* We used to say that this was not necessary on targets that support weak
1569 symbols, because the implicit instantiations will defer to the explicit
1570 one. However, that's not actually the case in SVR4; a strong definition
1571 after a weak one is an error. Also, not making explicit
1572 instantiations one_only means that we can end up with two copies of
1573 some template instantiations. */
1577 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1578 we can get away with not emitting them if they aren't used. We need
1579 to for variables so that cp_finish_decl will update their linkage,
1580 because their DECL_INITIAL may not have been set properly yet. */
1582 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1583 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1584 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1586 make_decl_one_only (decl, cxx_comdat_group (decl));
1588 if (TREE_CODE (decl) == VAR_DECL)
1590 DECL_COMDAT (decl) = 1;
1591 /* Mark it needed so we don't forget to emit it. */
1592 mark_decl_referenced (decl);
1597 /* Determine whether or not we want to specifically import or export CTYPE,
1598 using various heuristics. */
1601 import_export_class (tree ctype)
1603 /* -1 for imported, 1 for exported. */
1604 int import_export = 0;
1606 /* It only makes sense to call this function at EOF. The reason is
1607 that this function looks at whether or not the first non-inline
1608 non-abstract virtual member function has been defined in this
1609 translation unit. But, we can't possibly know that until we've
1610 seen the entire translation unit. */
1611 gcc_assert (at_eof);
1613 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1616 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1617 we will have CLASSTYPE_INTERFACE_ONLY set but not
1618 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1619 heuristic because someone will supply a #pragma implementation
1620 elsewhere, and deducing it here would produce a conflict. */
1621 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1624 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1626 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1628 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1629 && !flag_implicit_templates)
1630 /* For a template class, without -fimplicit-templates, check the
1631 repository. If the virtual table is assigned to this
1632 translation unit, then export the class; otherwise, import
1634 import_export = repo_export_class_p (ctype) ? 1 : -1;
1635 else if (TYPE_POLYMORPHIC_P (ctype))
1637 /* The ABI specifies that the virtual table and associated
1638 information are emitted with the key method, if any. */
1639 tree method = CLASSTYPE_KEY_METHOD (ctype);
1640 /* If weak symbol support is not available, then we must be
1641 careful not to emit the vtable when the key function is
1642 inline. An inline function can be defined in multiple
1643 translation units. If we were to emit the vtable in each
1644 translation unit containing a definition, we would get
1645 multiple definition errors at link-time. */
1646 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1647 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1650 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1651 a definition anywhere else. */
1652 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1655 /* Allow back ends the chance to overrule the decision. */
1656 if (targetm.cxx.import_export_class)
1657 import_export = targetm.cxx.import_export_class (ctype, import_export);
1661 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1662 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1666 /* Return true if VAR has already been provided to the back end; in that
1667 case VAR should not be modified further by the front end. */
1669 var_finalized_p (tree var)
1671 return varpool_node (var)->finalized;
1674 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1675 must be emitted in this translation unit. Mark it as such. */
1678 mark_needed (tree decl)
1680 /* It's possible that we no longer need to set
1681 TREE_SYMBOL_REFERENCED here directly, but doing so is
1683 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1684 mark_decl_referenced (decl);
1687 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1688 returns true if a definition of this entity should be provided in
1689 this object file. Callers use this function to determine whether
1690 or not to let the back end know that a definition of DECL is
1691 available in this translation unit. */
1694 decl_needed_p (tree decl)
1696 gcc_assert (TREE_CODE (decl) == VAR_DECL
1697 || TREE_CODE (decl) == FUNCTION_DECL);
1698 /* This function should only be called at the end of the translation
1699 unit. We cannot be sure of whether or not something will be
1700 COMDAT until that point. */
1701 gcc_assert (at_eof);
1703 /* All entities with external linkage that are not COMDAT should be
1704 emitted; they may be referred to from other object files. */
1705 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1707 /* If this entity was used, let the back end see it; it will decide
1708 whether or not to emit it into the object file. */
1709 if (TREE_USED (decl)
1710 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1711 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1713 /* Functions marked "dllexport" must be emitted so that they are
1714 visible to other DLLs. */
1715 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1717 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1718 reference to DECL might cause it to be emitted later. */
1722 /* If necessary, write out the vtables for the dynamic class CTYPE.
1723 Returns true if any vtables were emitted. */
1726 maybe_emit_vtables (tree ctype)
1732 /* If the vtables for this class have already been emitted there is
1733 nothing more to do. */
1734 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1735 if (var_finalized_p (primary_vtbl))
1737 /* Ignore dummy vtables made by get_vtable_decl. */
1738 if (TREE_TYPE (primary_vtbl) == void_type_node)
1741 /* On some targets, we cannot determine the key method until the end
1742 of the translation unit -- which is when this function is
1744 if (!targetm.cxx.key_method_may_be_inline ())
1745 determine_key_method (ctype);
1747 /* See if any of the vtables are needed. */
1748 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1750 import_export_decl (vtbl);
1751 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1756 /* If the references to this class' vtables are optimized away,
1757 still emit the appropriate debugging information. See
1759 if (DECL_COMDAT (primary_vtbl)
1760 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1761 note_debug_info_needed (ctype);
1765 /* The ABI requires that we emit all of the vtables if we emit any
1767 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1769 /* Mark entities references from the virtual table as used. */
1770 mark_vtable_entries (vtbl);
1772 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1774 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1776 /* It had better be all done at compile-time. */
1781 DECL_EXTERNAL (vtbl) = 0;
1782 rest_of_decl_compilation (vtbl, 1, 1);
1784 /* Because we're only doing syntax-checking, we'll never end up
1785 actually marking the variable as written. */
1786 if (flag_syntax_only)
1787 TREE_ASM_WRITTEN (vtbl) = 1;
1790 /* Since we're writing out the vtable here, also write the debug
1792 note_debug_info_needed (ctype);
1797 /* A special return value from type_visibility meaning internal
1800 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1802 /* walk_tree helper function for type_visibility. */
1805 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1807 int *vis_p = (int *)data;
1812 else if (CLASS_TYPE_P (*tp))
1814 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1816 *vis_p = VISIBILITY_ANON;
1819 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1820 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1825 /* Returns the visibility of TYPE, which is the minimum visibility of its
1829 type_visibility (tree type)
1831 int vis = VISIBILITY_DEFAULT;
1832 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1836 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1837 specified (or if VISIBILITY is static). */
1840 constrain_visibility (tree decl, int visibility)
1842 if (visibility == VISIBILITY_ANON)
1844 /* extern "C" declarations aren't affected by the anonymous
1846 if (!DECL_EXTERN_C_P (decl))
1848 TREE_PUBLIC (decl) = 0;
1849 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1850 DECL_INTERFACE_KNOWN (decl) = 1;
1851 if (DECL_LANG_SPECIFIC (decl))
1852 DECL_NOT_REALLY_EXTERN (decl) = 1;
1855 else if (visibility > DECL_VISIBILITY (decl)
1856 && !DECL_VISIBILITY_SPECIFIED (decl))
1858 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1864 /* Constrain the visibility of DECL based on the visibility of its template
1868 constrain_visibility_for_template (tree decl, tree targs)
1870 /* If this is a template instantiation, check the innermost
1871 template args for visibility constraints. The outer template
1872 args are covered by the class check. */
1873 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1875 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1879 tree arg = TREE_VEC_ELT (args, i-1);
1881 vis = type_visibility (arg);
1882 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1885 if (TREE_CODE (arg) == ADDR_EXPR)
1886 arg = TREE_OPERAND (arg, 0);
1887 if (TREE_CODE (arg) == VAR_DECL
1888 || TREE_CODE (arg) == FUNCTION_DECL)
1890 if (! TREE_PUBLIC (arg))
1891 vis = VISIBILITY_ANON;
1893 vis = DECL_VISIBILITY (arg);
1897 constrain_visibility (decl, vis);
1901 /* Like c_determine_visibility, but with additional C++-specific
1904 Function-scope entities can rely on the function's visibility because
1905 it is set in start_preparsed_function.
1907 Class-scope entities cannot rely on the class's visibility until the end
1908 of the enclosing class definition.
1910 Note that because namespaces have multiple independent definitions,
1911 namespace visibility is handled elsewhere using the #pragma visibility
1912 machinery rather than by decorating the namespace declaration.
1914 The goal is for constraints from the type to give a diagnostic, and
1915 other constraints to be applied silently. */
1918 determine_visibility (tree decl)
1920 tree class_type = NULL_TREE;
1922 bool orig_visibility_specified;
1923 enum symbol_visibility orig_visibility;
1925 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1927 /* Only relevant for names with external linkage. */
1928 if (!TREE_PUBLIC (decl))
1931 /* Cloned constructors and destructors get the same visibility as
1932 the underlying function. That should be set up in
1933 maybe_clone_body. */
1934 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1936 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
1937 orig_visibility = DECL_VISIBILITY (decl);
1939 if (TREE_CODE (decl) == TYPE_DECL)
1941 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1942 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1943 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1948 else if (DECL_LANG_SPECIFIC (decl))
1949 use_template = DECL_USE_TEMPLATE (decl);
1953 /* If DECL is a member of a class, visibility specifiers on the
1954 class can influence the visibility of the DECL. */
1955 if (DECL_CLASS_SCOPE_P (decl))
1956 class_type = DECL_CONTEXT (decl);
1959 /* Not a class member. */
1961 /* Virtual tables have DECL_CONTEXT set to their associated class,
1962 so they are automatically handled above. */
1963 gcc_assert (TREE_CODE (decl) != VAR_DECL
1964 || !DECL_VTABLE_OR_VTT_P (decl));
1966 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1968 /* Local statics and classes get the visibility of their
1969 containing function by default, except that
1970 -fvisibility-inlines-hidden doesn't affect them. */
1971 tree fn = DECL_CONTEXT (decl);
1972 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1974 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1975 DECL_VISIBILITY_SPECIFIED (decl) =
1976 DECL_VISIBILITY_SPECIFIED (fn);
1979 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1981 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1982 but have no TEMPLATE_INFO, so don't try to check it. */
1985 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1986 && flag_visibility_ms_compat)
1988 /* Under -fvisibility-ms-compat, types are visible by default,
1989 even though their contents aren't. */
1990 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1991 int underlying_vis = type_visibility (underlying_type);
1992 if (underlying_vis == VISIBILITY_ANON
1993 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1994 constrain_visibility (decl, underlying_vis);
1996 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1998 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2000 /* tinfo visibility is based on the type it's for. */
2001 constrain_visibility
2002 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2004 /* Give the target a chance to override the visibility associated
2006 if (TREE_PUBLIC (decl)
2007 && !DECL_REALLY_EXTERN (decl)
2008 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2009 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2010 targetm.cxx.determine_class_data_visibility (decl);
2012 else if (use_template)
2013 /* Template instantiations and specializations get visibility based
2014 on their template unless they override it with an attribute. */;
2015 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2017 /* Set default visibility to whatever the user supplied with
2018 #pragma GCC visibility or a namespace visibility attribute. */
2019 DECL_VISIBILITY (decl) = default_visibility;
2020 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2026 /* If the specialization doesn't specify visibility, use the
2027 visibility from the template. */
2028 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2029 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2030 : DECL_TEMPLATE_INFO (decl));
2031 tree args = TI_ARGS (tinfo);
2033 if (args != error_mark_node)
2035 int depth = TMPL_ARGS_DEPTH (args);
2036 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2038 if (!DECL_VISIBILITY_SPECIFIED (decl))
2040 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2041 DECL_VISIBILITY_SPECIFIED (decl)
2042 = DECL_VISIBILITY_SPECIFIED (pattern);
2045 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2046 if (args && depth > template_class_depth (class_type))
2047 /* Limit visibility based on its template arguments. */
2048 constrain_visibility_for_template (decl, args);
2053 determine_visibility_from_class (decl, class_type);
2055 if (decl_anon_ns_mem_p (decl))
2056 /* Names in an anonymous namespace get internal linkage.
2057 This might change once we implement export. */
2058 constrain_visibility (decl, VISIBILITY_ANON);
2059 else if (TREE_CODE (decl) != TYPE_DECL)
2061 /* Propagate anonymity from type to decl. */
2062 int tvis = type_visibility (TREE_TYPE (decl));
2063 if (tvis == VISIBILITY_ANON
2064 || ! DECL_VISIBILITY_SPECIFIED (decl))
2065 constrain_visibility (decl, tvis);
2068 /* If visibility changed and DECL already has DECL_RTL, ensure
2069 symbol flags are updated. */
2070 if ((DECL_VISIBILITY (decl) != orig_visibility
2071 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2072 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2073 || TREE_CODE (decl) == FUNCTION_DECL)
2074 && DECL_RTL_SET_P (decl))
2075 make_decl_rtl (decl);
2078 /* By default, static data members and function members receive
2079 the visibility of their containing class. */
2082 determine_visibility_from_class (tree decl, tree class_type)
2084 if (DECL_VISIBILITY_SPECIFIED (decl))
2087 if (visibility_options.inlines_hidden
2088 /* Don't do this for inline templates; specializations might not be
2089 inline, and we don't want them to inherit the hidden
2090 visibility. We'll set it here for all inline instantiations. */
2091 && !processing_template_decl
2092 && TREE_CODE (decl) == FUNCTION_DECL
2093 && DECL_DECLARED_INLINE_P (decl)
2094 && (! DECL_LANG_SPECIFIC (decl)
2095 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2096 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2099 /* Default to the class visibility. */
2100 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2101 DECL_VISIBILITY_SPECIFIED (decl)
2102 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2105 /* Give the target a chance to override the visibility associated
2107 if (TREE_CODE (decl) == VAR_DECL
2108 && (DECL_TINFO_P (decl)
2109 || (DECL_VTABLE_OR_VTT_P (decl)
2110 /* Construction virtual tables are not exported because
2111 they cannot be referred to from other object files;
2112 their name is not standardized by the ABI. */
2113 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2114 && TREE_PUBLIC (decl)
2115 && !DECL_REALLY_EXTERN (decl)
2116 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2117 targetm.cxx.determine_class_data_visibility (decl);
2120 /* Constrain the visibility of a class TYPE based on the visibility of its
2121 field types. Warn if any fields require lesser visibility. */
2124 constrain_class_visibility (tree type)
2130 int vis = type_visibility (type);
2132 if (vis == VISIBILITY_ANON
2133 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2136 /* Don't warn about visibility if the class has explicit visibility. */
2137 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2138 vis = VISIBILITY_INTERNAL;
2140 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2141 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2143 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2144 int subvis = type_visibility (ftype);
2146 if (subvis == VISIBILITY_ANON)
2148 if (!in_main_input_context ())
2150 %qT has a field %qD whose type uses the anonymous namespace",
2153 else if (MAYBE_CLASS_TYPE_P (ftype)
2154 && vis < VISIBILITY_HIDDEN
2155 && subvis >= VISIBILITY_HIDDEN)
2156 warning (OPT_Wattributes, "\
2157 %qT declared with greater visibility than the type of its field %qD",
2161 binfo = TYPE_BINFO (type);
2162 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2164 int subvis = type_visibility (TREE_TYPE (t));
2166 if (subvis == VISIBILITY_ANON)
2168 if (!in_main_input_context())
2170 %qT has a base %qT whose type uses the anonymous namespace",
2171 type, TREE_TYPE (t));
2173 else if (vis < VISIBILITY_HIDDEN
2174 && subvis >= VISIBILITY_HIDDEN)
2175 warning (OPT_Wattributes, "\
2176 %qT declared with greater visibility than its base %qT",
2177 type, TREE_TYPE (t));
2181 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2182 for DECL has not already been determined, do so now by setting
2183 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2184 function is called entities with vague linkage whose definitions
2185 are available must have TREE_PUBLIC set.
2187 If this function decides to place DECL in COMDAT, it will set
2188 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2189 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2190 callers defer that decision until it is clear that DECL is actually
2194 import_export_decl (tree decl)
2199 tree class_type = NULL_TREE;
2201 if (DECL_INTERFACE_KNOWN (decl))
2204 /* We cannot determine what linkage to give to an entity with vague
2205 linkage until the end of the file. For example, a virtual table
2206 for a class will be defined if and only if the key method is
2207 defined in this translation unit. As a further example, consider
2208 that when compiling a translation unit that uses PCH file with
2209 "-frepo" it would be incorrect to make decisions about what
2210 entities to emit when building the PCH; those decisions must be
2211 delayed until the repository information has been processed. */
2212 gcc_assert (at_eof);
2213 /* Object file linkage for explicit instantiations is handled in
2214 mark_decl_instantiated. For static variables in functions with
2215 vague linkage, maybe_commonize_var is used.
2217 Therefore, the only declarations that should be provided to this
2218 function are those with external linkage that are:
2220 * implicit instantiations of function templates
2224 * implicit instantiations of static data members of class
2231 Furthermore, all entities that reach this point must have a
2232 definition available in this translation unit.
2234 The following assertions check these conditions. */
2235 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2236 || TREE_CODE (decl) == VAR_DECL);
2237 /* Any code that creates entities with TREE_PUBLIC cleared should
2238 also set DECL_INTERFACE_KNOWN. */
2239 gcc_assert (TREE_PUBLIC (decl));
2240 if (TREE_CODE (decl) == FUNCTION_DECL)
2241 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2242 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2243 || DECL_DECLARED_INLINE_P (decl));
2245 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2246 || DECL_VTABLE_OR_VTT_P (decl)
2247 || DECL_TINFO_P (decl));
2248 /* Check that a definition of DECL is available in this translation
2250 gcc_assert (!DECL_REALLY_EXTERN (decl));
2252 /* Assume that DECL will not have COMDAT linkage. */
2254 /* Assume that DECL will not be imported into this translation
2258 /* See if the repository tells us whether or not to emit DECL in
2259 this translation unit. */
2260 emit_p = repo_emit_p (decl);
2263 else if (emit_p == 1)
2265 /* The repository indicates that this entity should be defined
2266 here. Make sure the back end honors that request. */
2267 if (TREE_CODE (decl) == VAR_DECL)
2269 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2270 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2273 FOR_EACH_CLONE (clone, decl)
2274 mark_needed (clone);
2278 /* Output the definition as an ordinary strong definition. */
2279 DECL_EXTERNAL (decl) = 0;
2280 DECL_INTERFACE_KNOWN (decl) = 1;
2285 /* We have already decided what to do with this DECL; there is no
2286 need to check anything further. */
2288 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2290 class_type = DECL_CONTEXT (decl);
2291 import_export_class (class_type);
2292 if (TYPE_FOR_JAVA (class_type))
2294 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2295 && CLASSTYPE_INTERFACE_ONLY (class_type))
2297 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2298 && !CLASSTYPE_USE_TEMPLATE (class_type)
2299 && CLASSTYPE_KEY_METHOD (class_type)
2300 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2301 /* The ABI requires that all virtual tables be emitted with
2302 COMDAT linkage. However, on systems where COMDAT symbols
2303 don't show up in the table of contents for a static
2304 archive, or on systems without weak symbols (where we
2305 approximate COMDAT linkage by using internal linkage), the
2306 linker will report errors about undefined symbols because
2307 it will not see the virtual table definition. Therefore,
2308 in the case that we know that the virtual table will be
2309 emitted in only one translation unit, we make the virtual
2310 table an ordinary definition with external linkage. */
2311 DECL_EXTERNAL (decl) = 0;
2312 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2314 /* CLASS_TYPE is being exported from this translation unit,
2315 so DECL should be defined here. */
2316 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2317 /* If a class is declared in a header with the "extern
2318 template" extension, then it will not be instantiated,
2319 even in translation units that would normally require
2320 it. Often such classes are explicitly instantiated in
2321 one translation unit. Therefore, the explicit
2322 instantiation must be made visible to other translation
2324 DECL_EXTERNAL (decl) = 0;
2327 /* The generic C++ ABI says that class data is always
2328 COMDAT, even if there is a key function. Some
2329 variants (e.g., the ARM EABI) says that class data
2330 only has COMDAT linkage if the class data might be
2331 emitted in more than one translation unit. When the
2332 key method can be inline and is inline, we still have
2333 to arrange for comdat even though
2334 class_data_always_comdat is false. */
2335 if (!CLASSTYPE_KEY_METHOD (class_type)
2336 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2337 || targetm.cxx.class_data_always_comdat ())
2339 /* The ABI requires COMDAT linkage. Normally, we
2340 only emit COMDAT things when they are needed;
2341 make sure that we realize that this entity is
2348 else if (!flag_implicit_templates
2349 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2354 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2356 tree type = TREE_TYPE (DECL_NAME (decl));
2357 if (CLASS_TYPE_P (type))
2360 import_export_class (type);
2361 if (CLASSTYPE_INTERFACE_KNOWN (type)
2362 && TYPE_POLYMORPHIC_P (type)
2363 && CLASSTYPE_INTERFACE_ONLY (type)
2364 /* If -fno-rtti was specified, then we cannot be sure
2365 that RTTI information will be emitted with the
2366 virtual table of the class, so we must emit it
2367 wherever it is used. */
2372 if (CLASSTYPE_INTERFACE_KNOWN (type)
2373 && !CLASSTYPE_INTERFACE_ONLY (type))
2375 comdat_p = (targetm.cxx.class_data_always_comdat ()
2376 || (CLASSTYPE_KEY_METHOD (type)
2377 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2382 DECL_EXTERNAL (decl) = 0;
2392 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2393 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2395 /* DECL is an implicit instantiation of a function or static
2397 if ((flag_implicit_templates
2398 && !flag_use_repository)
2399 || (flag_implicit_inline_templates
2400 && TREE_CODE (decl) == FUNCTION_DECL
2401 && DECL_DECLARED_INLINE_P (decl)))
2404 /* If we are not implicitly generating templates, then mark
2405 this entity as undefined in this translation unit. */
2408 else if (DECL_FUNCTION_MEMBER_P (decl))
2410 if (!DECL_DECLARED_INLINE_P (decl))
2412 tree ctype = DECL_CONTEXT (decl);
2413 import_export_class (ctype);
2414 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2416 DECL_NOT_REALLY_EXTERN (decl)
2417 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2418 || (DECL_DECLARED_INLINE_P (decl)
2419 && ! flag_implement_inlines
2420 && !DECL_VINDEX (decl)));
2422 if (!DECL_NOT_REALLY_EXTERN (decl))
2423 DECL_EXTERNAL (decl) = 1;
2425 /* Always make artificials weak. */
2426 if (DECL_ARTIFICIAL (decl) && flag_weak)
2429 maybe_make_one_only (decl);
2440 /* If we are importing DECL into this translation unit, mark is
2441 an undefined here. */
2442 DECL_EXTERNAL (decl) = 1;
2443 DECL_NOT_REALLY_EXTERN (decl) = 0;
2447 /* If we decided to put DECL in COMDAT, mark it accordingly at
2449 comdat_linkage (decl);
2452 DECL_INTERFACE_KNOWN (decl) = 1;
2455 /* Return an expression that performs the destruction of DECL, which
2456 must be a VAR_DECL whose type has a non-trivial destructor, or is
2457 an array whose (innermost) elements have a non-trivial destructor. */
2460 build_cleanup (tree decl)
2463 tree type = TREE_TYPE (decl);
2465 /* This function should only be called for declarations that really
2466 require cleanups. */
2467 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2469 /* Treat all objects with destructors as used; the destructor may do
2470 something substantive. */
2473 if (TREE_CODE (type) == ARRAY_TYPE)
2476 temp = build_address (decl);
2477 temp = build_delete (TREE_TYPE (temp), temp,
2478 sfk_complete_destructor,
2479 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2483 /* Returns the initialization guard variable for the variable DECL,
2484 which has static storage duration. */
2487 get_guard (tree decl)
2492 sname = mangle_guard_variable (decl);
2493 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2498 /* We use a type that is big enough to contain a mutex as well
2499 as an integer counter. */
2500 guard_type = targetm.cxx.guard_type ();
2501 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2502 VAR_DECL, sname, guard_type);
2504 /* The guard should have the same linkage as what it guards. */
2505 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2506 TREE_STATIC (guard) = TREE_STATIC (decl);
2507 DECL_COMMON (guard) = DECL_COMMON (decl);
2508 DECL_COMDAT_GROUP (guard) = DECL_COMDAT_GROUP (decl);
2509 if (TREE_PUBLIC (decl))
2510 DECL_WEAK (guard) = DECL_WEAK (decl);
2511 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2512 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2514 DECL_ARTIFICIAL (guard) = 1;
2515 DECL_IGNORED_P (guard) = 1;
2516 TREE_USED (guard) = 1;
2517 pushdecl_top_level_and_finish (guard, NULL_TREE);
2522 /* Return those bits of the GUARD variable that should be set when the
2523 guarded entity is actually initialized. */
2526 get_guard_bits (tree guard)
2528 if (!targetm.cxx.guard_mask_bit ())
2530 /* We only set the first byte of the guard, in order to leave room
2531 for a mutex in the high-order bits. */
2532 guard = build1 (ADDR_EXPR,
2533 build_pointer_type (TREE_TYPE (guard)),
2535 guard = build1 (NOP_EXPR,
2536 build_pointer_type (char_type_node),
2538 guard = build1 (INDIRECT_REF, char_type_node, guard);
2544 /* Return an expression which determines whether or not the GUARD
2545 variable has already been initialized. */
2548 get_guard_cond (tree guard)
2552 /* Check to see if the GUARD is zero. */
2553 guard = get_guard_bits (guard);
2555 /* Mask off all but the low bit. */
2556 if (targetm.cxx.guard_mask_bit ())
2558 guard_value = integer_one_node;
2559 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2560 guard_value = convert (TREE_TYPE (guard), guard_value);
2561 guard = cp_build_binary_op (input_location,
2562 BIT_AND_EXPR, guard, guard_value,
2563 tf_warning_or_error);
2566 guard_value = integer_zero_node;
2567 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2568 guard_value = convert (TREE_TYPE (guard), guard_value);
2569 return cp_build_binary_op (input_location,
2570 EQ_EXPR, guard, guard_value,
2571 tf_warning_or_error);
2574 /* Return an expression which sets the GUARD variable, indicating that
2575 the variable being guarded has been initialized. */
2578 set_guard (tree guard)
2582 /* Set the GUARD to one. */
2583 guard = get_guard_bits (guard);
2584 guard_init = integer_one_node;
2585 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2586 guard_init = convert (TREE_TYPE (guard), guard_init);
2587 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2588 tf_warning_or_error);
2591 /* Start the process of running a particular set of global constructors
2592 or destructors. Subroutine of do_[cd]tors. */
2595 start_objects (int method_type, int initp)
2601 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2603 if (initp != DEFAULT_INIT_PRIORITY)
2613 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2616 sprintf (type, "%c", method_type);
2618 fndecl = build_lang_decl (FUNCTION_DECL,
2619 get_file_function_name (type),
2620 build_function_type (void_type_node,
2622 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2624 TREE_PUBLIC (current_function_decl) = 0;
2626 /* Mark as artificial because it's not explicitly in the user's
2628 DECL_ARTIFICIAL (current_function_decl) = 1;
2630 /* Mark this declaration as used to avoid spurious warnings. */
2631 TREE_USED (current_function_decl) = 1;
2633 /* Mark this function as a global constructor or destructor. */
2634 if (method_type == 'I')
2635 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2637 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2639 body = begin_compound_stmt (BCS_FN_BODY);
2644 /* Finish the process of running a particular set of global constructors
2645 or destructors. Subroutine of do_[cd]tors. */
2648 finish_objects (int method_type, int initp, tree body)
2653 finish_compound_stmt (body);
2654 fn = finish_function (0);
2656 if (method_type == 'I')
2658 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2659 decl_init_priority_insert (fn, initp);
2663 DECL_STATIC_DESTRUCTOR (fn) = 1;
2664 decl_fini_priority_insert (fn, initp);
2667 expand_or_defer_fn (fn);
2670 /* The names of the parameters to the function created to handle
2671 initializations and destructions for objects with static storage
2673 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2674 #define PRIORITY_IDENTIFIER "__priority"
2676 /* The name of the function we create to handle initializations and
2677 destructions for objects with static storage duration. */
2678 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2680 /* The declaration for the __INITIALIZE_P argument. */
2681 static GTY(()) tree initialize_p_decl;
2683 /* The declaration for the __PRIORITY argument. */
2684 static GTY(()) tree priority_decl;
2686 /* The declaration for the static storage duration function. */
2687 static GTY(()) tree ssdf_decl;
2689 /* All the static storage duration functions created in this
2690 translation unit. */
2691 static GTY(()) VEC(tree,gc) *ssdf_decls;
2693 /* A map from priority levels to information about that priority
2694 level. There may be many such levels, so efficient lookup is
2696 static splay_tree priority_info_map;
2698 /* Begins the generation of the function that will handle all
2699 initialization and destruction of objects with static storage
2700 duration. The function generated takes two parameters of type
2701 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2702 nonzero, it performs initializations. Otherwise, it performs
2703 destructions. It only performs those initializations or
2704 destructions with the indicated __PRIORITY. The generated function
2707 It is assumed that this function will only be called once per
2708 translation unit. */
2711 start_static_storage_duration_function (unsigned count)
2716 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2718 /* Create the identifier for this function. It will be of the form
2719 SSDF_IDENTIFIER_<number>. */
2720 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2722 /* Create the parameters. */
2723 parm_types = void_list_node;
2724 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2725 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2726 type = build_function_type (void_type_node, parm_types);
2728 /* Create the FUNCTION_DECL itself. */
2729 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2730 get_identifier (id),
2732 TREE_PUBLIC (ssdf_decl) = 0;
2733 DECL_ARTIFICIAL (ssdf_decl) = 1;
2735 /* Put this function in the list of functions to be called from the
2736 static constructors and destructors. */
2739 ssdf_decls = VEC_alloc (tree, gc, 32);
2741 /* Take this opportunity to initialize the map from priority
2742 numbers to information about that priority level. */
2743 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2744 /*delete_key_fn=*/0,
2745 /*delete_value_fn=*/
2746 (splay_tree_delete_value_fn) &free);
2748 /* We always need to generate functions for the
2749 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2750 priorities later, we'll be sure to find the
2751 DEFAULT_INIT_PRIORITY. */
2752 get_priority_info (DEFAULT_INIT_PRIORITY);
2755 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2757 /* Create the argument list. */
2758 initialize_p_decl = cp_build_parm_decl
2759 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2760 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2761 TREE_USED (initialize_p_decl) = 1;
2762 priority_decl = cp_build_parm_decl
2763 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2764 DECL_CONTEXT (priority_decl) = ssdf_decl;
2765 TREE_USED (priority_decl) = 1;
2767 TREE_CHAIN (initialize_p_decl) = priority_decl;
2768 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2770 /* Put the function in the global scope. */
2771 pushdecl (ssdf_decl);
2773 /* Start the function itself. This is equivalent to declaring the
2776 static void __ssdf (int __initialize_p, init __priority_p);
2778 It is static because we only need to call this function from the
2779 various constructor and destructor functions for this module. */
2780 start_preparsed_function (ssdf_decl,
2781 /*attrs=*/NULL_TREE,
2784 /* Set up the scope of the outermost block in the function. */
2785 body = begin_compound_stmt (BCS_FN_BODY);
2790 /* Finish the generation of the function which performs initialization
2791 and destruction of objects with static storage duration. After
2792 this point, no more such objects can be created. */
2795 finish_static_storage_duration_function (tree body)
2797 /* Close out the function. */
2798 finish_compound_stmt (body);
2799 expand_or_defer_fn (finish_function (0));
2802 /* Return the information about the indicated PRIORITY level. If no
2803 code to handle this level has yet been generated, generate the
2804 appropriate prologue. */
2806 static priority_info
2807 get_priority_info (int priority)
2812 n = splay_tree_lookup (priority_info_map,
2813 (splay_tree_key) priority);
2816 /* Create a new priority information structure, and insert it
2818 pi = XNEW (struct priority_info_s);
2819 pi->initializations_p = 0;
2820 pi->destructions_p = 0;
2821 splay_tree_insert (priority_info_map,
2822 (splay_tree_key) priority,
2823 (splay_tree_value) pi);
2826 pi = (priority_info) n->value;
2831 /* The effective initialization priority of a DECL. */
2833 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2834 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2835 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2837 /* Whether a DECL needs a guard to protect it against multiple
2840 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2841 || DECL_ONE_ONLY (decl) \
2842 || DECL_WEAK (decl)))
2844 /* Called from one_static_initialization_or_destruction(),
2846 Walks the initializer list of a global variable and looks for
2847 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2848 and that have their DECL_CONTEXT() == NULL.
2849 For each such temporary variable, set their DECL_CONTEXT() to
2850 the current function. This is necessary because otherwise
2851 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2852 when trying to refer to a temporary variable that does not have
2853 it's DECL_CONTECT() properly set. */
2855 fix_temporary_vars_context_r (tree *node,
2856 int *unused ATTRIBUTE_UNUSED,
2857 void *unused1 ATTRIBUTE_UNUSED)
2859 gcc_assert (current_function_decl);
2861 if (TREE_CODE (*node) == BIND_EXPR)
2865 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2866 if (TREE_CODE (var) == VAR_DECL
2868 && DECL_ARTIFICIAL (var)
2869 && !DECL_CONTEXT (var))
2870 DECL_CONTEXT (var) = current_function_decl;
2876 /* Set up to handle the initialization or destruction of DECL. If
2877 INITP is nonzero, we are initializing the variable. Otherwise, we
2878 are destroying it. */
2881 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2883 tree guard_if_stmt = NULL_TREE;
2886 /* If we are supposed to destruct and there's a trivial destructor,
2887 nothing has to be done. */
2889 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2892 /* Trick the compiler into thinking we are at the file and line
2893 where DECL was declared so that error-messages make sense, and so
2894 that the debugger will show somewhat sensible file and line
2896 input_location = DECL_SOURCE_LOCATION (decl);
2898 /* Make sure temporary variables in the initialiser all have
2899 their DECL_CONTEXT() set to a value different from NULL_TREE.
2900 This can happen when global variables initialisers are built.
2901 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2902 the temporary variables that might have been generated in the
2903 accompagning initialisers is NULL_TREE, meaning the variables have been
2904 declared in the global namespace.
2905 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2906 of the temporaries are set to the current function decl. */
2907 cp_walk_tree_without_duplicates (&init,
2908 fix_temporary_vars_context_r,
2915 Access control for implicit calls to the constructors,
2916 the conversion functions, or the destructor called to
2917 create and destroy a static data member is performed as
2918 if these calls appeared in the scope of the member's
2921 we pretend we are in a static member function of the class of
2922 which the DECL is a member. */
2923 if (member_p (decl))
2925 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2926 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2929 /* Assume we don't need a guard. */
2931 /* We need a guard if this is an object with external linkage that
2932 might be initialized in more than one place. (For example, a
2933 static data member of a template, when the data member requires
2935 if (NEEDS_GUARD_P (decl))
2939 guard = get_guard (decl);
2941 /* When using __cxa_atexit, we just check the GUARD as we would
2942 for a local static. */
2943 if (flag_use_cxa_atexit)
2945 /* When using __cxa_atexit, we never try to destroy
2946 anything from a static destructor. */
2948 guard_cond = get_guard_cond (guard);
2950 /* If we don't have __cxa_atexit, then we will be running
2951 destructors from .fini sections, or their equivalents. So,
2952 we need to know how many times we've tried to initialize this
2953 object. We do initializations only if the GUARD is zero,
2954 i.e., if we are the first to initialize the variable. We do
2955 destructions only if the GUARD is one, i.e., if we are the
2956 last to destroy the variable. */
2959 = cp_build_binary_op (input_location,
2961 cp_build_unary_op (PREINCREMENT_EXPR,
2964 tf_warning_or_error),
2966 tf_warning_or_error);
2969 = cp_build_binary_op (input_location,
2971 cp_build_unary_op (PREDECREMENT_EXPR,
2974 tf_warning_or_error),
2976 tf_warning_or_error);
2978 guard_if_stmt = begin_if_stmt ();
2979 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2983 /* If we're using __cxa_atexit, we have not already set the GUARD,
2984 so we must do so now. */
2985 if (guard && initp && flag_use_cxa_atexit)
2986 finish_expr_stmt (set_guard (guard));
2988 /* Perform the initialization or destruction. */
2992 finish_expr_stmt (init);
2994 /* If we're using __cxa_atexit, register a function that calls the
2995 destructor for the object. */
2996 if (flag_use_cxa_atexit)
2997 finish_expr_stmt (register_dtor_fn (decl));
3000 finish_expr_stmt (build_cleanup (decl));
3002 /* Finish the guard if-stmt, if necessary. */
3005 finish_then_clause (guard_if_stmt);
3006 finish_if_stmt (guard_if_stmt);
3009 /* Now that we're done with DECL we don't need to pretend to be a
3010 member of its class any longer. */
3011 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3012 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3015 /* Generate code to do the initialization or destruction of the decls in VARS,
3016 a TREE_LIST of VAR_DECL with static storage duration.
3017 Whether initialization or destruction is performed is specified by INITP. */
3020 do_static_initialization_or_destruction (tree vars, bool initp)
3022 tree node, init_if_stmt, cond;
3024 /* Build the outer if-stmt to check for initialization or destruction. */
3025 init_if_stmt = begin_if_stmt ();
3026 cond = initp ? integer_one_node : integer_zero_node;
3027 cond = cp_build_binary_op (input_location,
3031 tf_warning_or_error);
3032 finish_if_stmt_cond (cond, init_if_stmt);
3036 tree decl = TREE_VALUE (node);
3037 tree priority_if_stmt;
3041 /* If we don't need a destructor, there's nothing to do. Avoid
3042 creating a possibly empty if-stmt. */
3043 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3045 node = TREE_CHAIN (node);
3049 /* Remember that we had an initialization or finalization at this
3051 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3052 pi = get_priority_info (priority);
3054 pi->initializations_p = 1;
3056 pi->destructions_p = 1;
3058 /* Conditionalize this initialization on being in the right priority
3059 and being initializing/finalizing appropriately. */
3060 priority_if_stmt = begin_if_stmt ();
3061 cond = cp_build_binary_op (input_location,
3064 build_int_cst (NULL_TREE, priority),
3065 tf_warning_or_error);
3066 finish_if_stmt_cond (cond, priority_if_stmt);
3068 /* Process initializers with same priority. */
3070 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3071 node = TREE_CHAIN (node))
3072 /* Do one initialization or destruction. */
3073 one_static_initialization_or_destruction (TREE_VALUE (node),
3074 TREE_PURPOSE (node), initp);
3076 /* Finish up the priority if-stmt body. */
3077 finish_then_clause (priority_if_stmt);
3078 finish_if_stmt (priority_if_stmt);
3082 /* Finish up the init/destruct if-stmt body. */
3083 finish_then_clause (init_if_stmt);
3084 finish_if_stmt (init_if_stmt);
3087 /* VARS is a list of variables with static storage duration which may
3088 need initialization and/or finalization. Remove those variables
3089 that don't really need to be initialized or finalized, and return
3090 the resulting list. The order in which the variables appear in
3091 VARS is in reverse order of the order in which they should actually
3092 be initialized. The list we return is in the unreversed order;
3093 i.e., the first variable should be initialized first. */
3096 prune_vars_needing_no_initialization (tree *vars)
3099 tree result = NULL_TREE;
3104 tree decl = TREE_VALUE (t);
3105 tree init = TREE_PURPOSE (t);
3107 /* Deal gracefully with error. */
3108 if (decl == error_mark_node)
3110 var = &TREE_CHAIN (t);
3114 /* The only things that can be initialized are variables. */
3115 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3117 /* If this object is not defined, we don't need to do anything
3119 if (DECL_EXTERNAL (decl))
3121 var = &TREE_CHAIN (t);
3125 /* Also, if the initializer already contains errors, we can bail
3127 if (init && TREE_CODE (init) == TREE_LIST
3128 && value_member (error_mark_node, init))
3130 var = &TREE_CHAIN (t);
3134 /* This variable is going to need initialization and/or
3135 finalization, so we add it to the list. */
3136 *var = TREE_CHAIN (t);
3137 TREE_CHAIN (t) = result;
3144 /* Make sure we have told the back end about all the variables in
3148 write_out_vars (tree vars)
3152 for (v = vars; v; v = TREE_CHAIN (v))
3154 tree var = TREE_VALUE (v);
3155 if (!var_finalized_p (var))
3157 import_export_decl (var);
3158 rest_of_decl_compilation (var, 1, 1);
3163 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3164 (otherwise) that will initialize all global objects with static
3165 storage duration having the indicated PRIORITY. */
3168 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3177 input_location = *locus;
3179 /* Was: locus->line++; */
3181 /* We use `I' to indicate initialization and `D' to indicate
3183 function_key = constructor_p ? 'I' : 'D';
3185 /* We emit the function lazily, to avoid generating empty
3186 global constructors and destructors. */
3189 /* For Objective-C++, we may need to initialize metadata found in this module.
3190 This must be done _before_ any other static initializations. */
3191 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3192 && constructor_p && objc_static_init_needed_p ())
3194 body = start_objects (function_key, priority);
3195 objc_generate_static_init_call (NULL_TREE);
3198 /* Call the static storage duration function with appropriate
3200 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3202 /* Calls to pure or const functions will expand to nothing. */
3203 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3206 body = start_objects (function_key, priority);
3208 arguments = tree_cons (NULL_TREE,
3209 build_int_cst (NULL_TREE, priority),
3211 arguments = tree_cons (NULL_TREE,
3212 build_int_cst (NULL_TREE, constructor_p),
3214 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3215 tf_warning_or_error));
3219 /* Close out the function. */
3221 finish_objects (function_key, priority, body);
3224 /* Generate constructor and destructor functions for the priority
3228 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3230 location_t *locus = (location_t *) data;
3231 int priority = (int) n->key;
3232 priority_info pi = (priority_info) n->value;
3234 /* Generate the functions themselves, but only if they are really
3236 if (pi->initializations_p)
3237 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3238 if (pi->destructions_p)
3239 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3241 /* Keep iterating. */
3245 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3246 decls referenced from front-end specific constructs; it will be called
3247 only for language-specific tree nodes.
3249 Here we must deal with member pointers. */
3252 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3256 switch (TREE_CODE (t))
3259 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3260 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3263 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3264 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3267 if (DECL_VTABLE_OR_VTT_P (t))
3269 /* The ABI requires that all virtual tables be emitted
3270 whenever one of them is. */
3272 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3274 vtbl = TREE_CHAIN (vtbl))
3275 mark_decl_referenced (vtbl);
3277 else if (DECL_CONTEXT (t)
3278 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3279 /* If we need a static variable in a function, then we
3280 need the containing function. */
3281 mark_decl_referenced (DECL_CONTEXT (t));
3290 /* Java requires that we be able to reference a local address for a
3291 method, and not be confused by PLT entries. If hidden aliases are
3292 supported, collect and return all the functions for which we should
3293 emit a hidden alias. */
3295 static struct pointer_set_t *
3296 collect_candidates_for_java_method_aliases (void)
3298 struct cgraph_node *node;
3299 struct pointer_set_t *candidates = NULL;
3301 #ifndef HAVE_GAS_HIDDEN
3305 for (node = cgraph_nodes; node ; node = node->next)
3307 tree fndecl = node->decl;
3309 if (DECL_CONTEXT (fndecl)
3310 && TYPE_P (DECL_CONTEXT (fndecl))
3311 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3312 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3314 if (candidates == NULL)
3315 candidates = pointer_set_create ();
3316 pointer_set_insert (candidates, fndecl);
3324 /* Java requires that we be able to reference a local address for a
3325 method, and not be confused by PLT entries. If hidden aliases are
3326 supported, emit one for each java function that we've emitted.
3327 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3328 by collect_candidates_for_java_method_aliases. */
3331 build_java_method_aliases (struct pointer_set_t *candidates)
3333 struct cgraph_node *node;
3335 #ifndef HAVE_GAS_HIDDEN
3339 for (node = cgraph_nodes; node ; node = node->next)
3341 tree fndecl = node->decl;
3343 if (TREE_ASM_WRITTEN (fndecl)
3344 && pointer_set_contains (candidates, fndecl))
3346 /* Mangle the name in a predictable way; we need to reference
3347 this from a java compiled object file. */
3348 tree oid, nid, alias;
3352 oid = DECL_ASSEMBLER_NAME (fndecl);
3353 oname = IDENTIFIER_POINTER (oid);
3354 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3355 nname = ACONCAT (("_ZGA", oname+2, NULL));
3356 nid = get_identifier (nname);
3358 alias = make_alias_for (fndecl, nid);
3359 TREE_PUBLIC (alias) = 1;
3360 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3362 assemble_alias (alias, oid);
3367 /* Returns true iff there is a definition available for variable or
3371 decl_defined_p (tree decl)
3373 if (TREE_CODE (decl) == FUNCTION_DECL)
3374 return (DECL_INITIAL (decl) != NULL_TREE);
3377 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3378 return !DECL_EXTERNAL (decl);
3382 /* Complain that DECL uses a type with no linkage but is never defined. */
3385 no_linkage_error (tree decl)
3387 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3388 if (TYPE_ANONYMOUS_P (t))
3390 permerror (0, "%q+#D, declared using anonymous type, "
3391 "is used but never defined", decl);
3392 if (is_typedef_decl (TYPE_NAME (t)))
3393 permerror (0, "%q+#D does not refer to the unqualified type, "
3394 "so it is not used for linkage", TYPE_NAME (t));
3397 permerror (0, "%q+#D, declared using local type %qT, "
3398 "is used but never defined", decl, t);
3401 /* This routine is called at the end of compilation.
3402 Its job is to create all the code needed to initialize and
3403 destroy the global aggregates. We do the destruction
3404 first, since that way we only need to reverse the decls once. */
3407 cp_write_global_declarations (void)
3413 unsigned ssdf_count = 0;
3416 struct pointer_set_t *candidates;
3418 locus = input_location;
3421 /* Bad parse errors. Just forget about it. */
3422 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3426 c_common_write_pch ();
3428 /* FIXME - huh? was input_line -= 1;*/
3430 /* We now have to write out all the stuff we put off writing out.
3433 o Template specializations that we have not yet instantiated,
3434 but which are needed.
3435 o Initialization and destruction for non-local objects with
3436 static storage duration. (Local objects with static storage
3437 duration are initialized when their scope is first entered,
3438 and are cleaned up via atexit.)
3439 o Virtual function tables.
3441 All of these may cause others to be needed. For example,
3442 instantiating one function may cause another to be needed, and
3443 generating the initializer for an object may cause templates to be
3444 instantiated, etc., etc. */
3446 timevar_push (TV_VARCONST);
3448 emit_support_tinfos ();
3457 /* If there are templates that we've put off instantiating, do
3459 instantiate_pending_templates (retries);
3462 /* Write out virtual tables as required. Note that writing out
3463 the virtual table for a template class may cause the
3464 instantiation of members of that class. If we write out
3465 vtables then we remove the class from our list so we don't
3466 have to look at it again. */
3468 while (keyed_classes != NULL_TREE
3469 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3472 keyed_classes = TREE_CHAIN (keyed_classes);
3478 tree next = TREE_CHAIN (t);
3482 if (maybe_emit_vtables (TREE_VALUE (next)))
3485 TREE_CHAIN (t) = TREE_CHAIN (next);
3490 next = TREE_CHAIN (t);
3494 /* Write out needed type info variables. We have to be careful
3495 looping through unemitted decls, because emit_tinfo_decl may
3496 cause other variables to be needed. New elements will be
3497 appended, and we remove from the vector those that actually
3499 for (i = VEC_length (tree, unemitted_tinfo_decls);
3500 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3501 if (emit_tinfo_decl (t))
3504 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3507 /* The list of objects with static storage duration is built up
3508 in reverse order. We clear STATIC_AGGREGATES so that any new
3509 aggregates added during the initialization of these will be
3510 initialized in the correct order when we next come around the
3512 vars = prune_vars_needing_no_initialization (&static_aggregates);
3516 /* We need to start a new initialization function each time
3517 through the loop. That's because we need to know which
3518 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3519 isn't computed until a function is finished, and written
3520 out. That's a deficiency in the back end. When this is
3521 fixed, these initialization functions could all become
3522 inline, with resulting performance improvements. */
3525 /* Set the line and file, so that it is obviously not from
3527 input_location = locus;
3528 ssdf_body = start_static_storage_duration_function (ssdf_count);
3530 /* Make sure the back end knows about all the variables. */
3531 write_out_vars (vars);
3533 /* First generate code to do all the initializations. */
3535 do_static_initialization_or_destruction (vars, /*initp=*/true);
3537 /* Then, generate code to do all the destructions. Do these
3538 in reverse order so that the most recently constructed
3539 variable is the first destroyed. If we're using
3540 __cxa_atexit, then we don't need to do this; functions
3541 were registered at initialization time to destroy the
3543 if (!flag_use_cxa_atexit && vars)
3545 vars = nreverse (vars);
3546 do_static_initialization_or_destruction (vars, /*initp=*/false);
3551 /* Finish up the static storage duration function for this
3553 input_location = locus;
3554 finish_static_storage_duration_function (ssdf_body);
3556 /* All those initializations and finalizations might cause
3557 us to need more inline functions, more template
3558 instantiations, etc. */
3561 /* ??? was: locus.line++; */
3564 /* Go through the set of inline functions whose bodies have not
3565 been emitted yet. If out-of-line copies of these functions
3566 are required, emit them. */
3567 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3569 /* Does it need synthesizing? */
3570 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3571 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3573 /* Even though we're already at the top-level, we push
3574 there again. That way, when we pop back a few lines
3575 hence, all of our state is restored. Otherwise,
3576 finish_function doesn't clean things up, and we end
3577 up with CURRENT_FUNCTION_DECL set. */
3578 push_to_top_level ();
3579 /* The decl's location will mark where it was first
3580 needed. Save that so synthesize method can indicate
3581 where it was needed from, in case of error */
3582 input_location = DECL_SOURCE_LOCATION (decl);
3583 synthesize_method (decl);
3584 pop_from_top_level ();
3588 if (!DECL_SAVED_TREE (decl))
3591 /* We lie to the back end, pretending that some functions
3592 are not defined when they really are. This keeps these
3593 functions from being put out unnecessarily. But, we must
3594 stop lying when the functions are referenced, or if they
3595 are not comdat since they need to be put out now. If
3596 DECL_INTERFACE_KNOWN, then we have already set
3597 DECL_EXTERNAL appropriately, so there's no need to check
3598 again, and we do not want to clear DECL_EXTERNAL if a
3599 previous call to import_export_decl set it.
3601 This is done in a separate for cycle, because if some
3602 deferred function is contained in another deferred
3603 function later in deferred_fns varray,
3604 rest_of_compilation would skip this function and we
3605 really cannot expand the same function twice. */
3606 import_export_decl (decl);
3607 if (DECL_NOT_REALLY_EXTERN (decl)
3608 && DECL_INITIAL (decl)
3609 && decl_needed_p (decl))
3610 DECL_EXTERNAL (decl) = 0;
3612 /* If we're going to need to write this function out, and
3613 there's already a body for it, create RTL for it now.
3614 (There might be no body if this is a method we haven't
3615 gotten around to synthesizing yet.) */
3616 if (!DECL_EXTERNAL (decl)
3617 && decl_needed_p (decl)
3618 && !TREE_ASM_WRITTEN (decl)
3619 && !cgraph_node (decl)->local.finalized)
3621 /* We will output the function; no longer consider it in this
3623 DECL_DEFER_OUTPUT (decl) = 0;
3624 /* Generate RTL for this function now that we know we
3626 expand_or_defer_fn (decl);
3627 /* If we're compiling -fsyntax-only pretend that this
3628 function has been written out so that we don't try to
3630 if (flag_syntax_only)
3631 TREE_ASM_WRITTEN (decl) = 1;
3636 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3639 /* Static data members are just like namespace-scope globals. */
3640 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3642 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3643 /* Don't write it out if we haven't seen a definition. */
3644 || DECL_IN_AGGR_P (decl))
3646 import_export_decl (decl);
3647 /* If this static data member is needed, provide it to the
3649 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3650 DECL_EXTERNAL (decl) = 0;
3652 if (VEC_length (tree, pending_statics) != 0
3653 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3654 VEC_length (tree, pending_statics)))
3661 /* All used inline functions must have a definition at this point. */
3662 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3664 if (/* Check online inline functions that were actually used. */
3665 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3666 /* If the definition actually was available here, then the
3667 fact that the function was not defined merely represents
3668 that for some reason (use of a template repository,
3669 #pragma interface, etc.) we decided not to emit the
3671 && !DECL_INITIAL (decl)
3672 /* An explicit instantiation can be used to specify
3673 that the body is in another unit. It will have
3674 already verified there was a definition. */
3675 && !DECL_EXPLICIT_INSTANTIATION (decl))
3677 warning (0, "inline function %q+D used but never defined", decl);
3678 /* Avoid a duplicate warning from check_global_declaration_1. */
3679 TREE_NO_WARNING (decl) = 1;
3683 /* So must decls that use a type with no linkage. */
3684 for (i = 0; VEC_iterate (tree, no_linkage_decls, i, decl); ++i)
3685 if (!decl_defined_p (decl))
3686 no_linkage_error (decl);
3688 /* We give C linkage to static constructors and destructors. */
3689 push_lang_context (lang_name_c);
3691 /* Generate initialization and destruction functions for all
3692 priorities for which they are required. */
3693 if (priority_info_map)
3694 splay_tree_foreach (priority_info_map,
3695 generate_ctor_and_dtor_functions_for_priority,
3697 else if (c_dialect_objc () && objc_static_init_needed_p ())
3698 /* If this is obj-c++ and we need a static init, call
3699 generate_ctor_or_dtor_function. */
3700 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3701 DEFAULT_INIT_PRIORITY, &locus);
3703 /* We're done with the splay-tree now. */
3704 if (priority_info_map)
3705 splay_tree_delete (priority_info_map);
3707 /* Generate any missing aliases. */
3708 maybe_apply_pending_pragma_weaks ();
3710 /* We're done with static constructors, so we can go back to "C++"
3712 pop_lang_context ();
3714 /* Collect candidates for Java hidden aliases. */
3715 candidates = collect_candidates_for_java_method_aliases ();
3717 cgraph_finalize_compilation_unit ();
3719 /* Now, issue warnings about static, but not defined, functions,
3720 etc., and emit debugging information. */
3721 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3722 if (VEC_length (tree, pending_statics) != 0)
3724 check_global_declarations (VEC_address (tree, pending_statics),
3725 VEC_length (tree, pending_statics));
3726 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3727 VEC_length (tree, pending_statics));
3730 /* Generate hidden aliases for Java. */
3733 build_java_method_aliases (candidates);
3734 pointer_set_destroy (candidates);
3739 /* The entire file is now complete. If requested, dump everything
3743 FILE *stream = dump_begin (TDI_tu, &flags);
3747 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3748 dump_end (TDI_tu, stream);
3752 timevar_pop (TV_VARCONST);
3754 if (flag_detailed_statistics)
3756 dump_tree_statistics ();
3757 dump_time_statistics ();
3759 input_location = locus;
3761 #ifdef ENABLE_CHECKING
3762 validate_conversion_obstack ();
3763 #endif /* ENABLE_CHECKING */
3766 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3767 function to call in parse-tree form; it has not yet been
3768 semantically analyzed. ARGS are the arguments to the function.
3769 They have already been semantically analyzed. This may change
3773 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
3776 VEC(tree,gc) *orig_args = NULL;
3781 object = TREE_OPERAND (fn, 0);
3783 if (processing_template_decl)
3785 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3786 || TREE_CODE (fn) == MEMBER_REF);
3787 if (type_dependent_expression_p (fn)
3788 || any_type_dependent_arguments_p (*args))
3789 return build_nt_call_vec (fn, *args);
3791 orig_args = make_tree_vector_copy (*args);
3793 /* Transform the arguments and add the implicit "this"
3794 parameter. That must be done before the FN is transformed
3795 because we depend on the form of FN. */
3796 make_args_non_dependent (*args);
3797 object = build_non_dependent_expr (object);
3798 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3799 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3800 VEC_safe_insert (tree, gc, *args, 0, object);
3801 /* Now that the arguments are done, transform FN. */
3802 fn = build_non_dependent_expr (fn);
3805 /* A qualified name corresponding to a bound pointer-to-member is
3806 represented as an OFFSET_REF:
3808 struct B { void g(); };
3810 void B::g() { (this->*p)(); } */
3811 if (TREE_CODE (fn) == OFFSET_REF)
3813 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3814 tf_warning_or_error);
3815 fn = TREE_OPERAND (fn, 1);
3816 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3817 VEC_safe_insert (tree, gc, *args, 0, object_addr);
3820 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
3821 if (processing_template_decl && expr != error_mark_node)
3822 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
3824 if (orig_args != NULL)
3825 release_tree_vector (orig_args);
3832 check_default_args (tree x)
3834 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3835 bool saw_def = false;
3836 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3837 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3839 if (TREE_PURPOSE (arg))
3843 error ("default argument missing for parameter %P of %q+#D", i, x);
3844 TREE_PURPOSE (arg) = error_mark_node;
3849 /* Return true if function DECL can be inlined. This is used to force
3850 instantiation of methods that might be interesting for inlining. */
3852 possibly_inlined_p (tree decl)
3854 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3855 if (DECL_UNINLINABLE (decl))
3857 if (!optimize || pragma_java_exceptions)
3858 return DECL_DECLARED_INLINE_P (decl);
3859 /* When optimizing, we might inline everything when flatten
3860 attribute or heuristics inlining for size or autoinlining
3865 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3866 If DECL is a specialization or implicitly declared class member,
3867 generate the actual definition. */
3870 mark_used (tree decl)
3872 HOST_WIDE_INT saved_processing_template_decl = 0;
3874 /* If DECL is a BASELINK for a single function, then treat it just
3875 like the DECL for the function. Otherwise, if the BASELINK is
3876 for an overloaded function, we don't know which function was
3877 actually used until after overload resolution. */
3878 if (TREE_CODE (decl) == BASELINK)
3880 decl = BASELINK_FUNCTIONS (decl);
3881 if (really_overloaded_fn (decl))
3883 decl = OVL_CURRENT (decl);
3886 /* Set TREE_USED for the benefit of -Wunused. */
3887 TREE_USED (decl) = 1;
3888 if (DECL_CLONED_FUNCTION_P (decl))
3889 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3891 if (TREE_CODE (decl) == FUNCTION_DECL
3892 && DECL_DELETED_FN (decl))
3894 error ("deleted function %q+D", decl);
3895 error ("used here");
3898 /* If we don't need a value, then we don't need to synthesize DECL. */
3899 if (cp_unevaluated_operand != 0)
3902 /* We can only check DECL_ODR_USED on variables or functions with
3903 DECL_LANG_SPECIFIC set, and these are also the only decls that we
3904 might need special handling for. */
3905 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
3906 || DECL_LANG_SPECIFIC (decl) == NULL
3907 || DECL_THUNK_P (decl))
3910 /* We only want to do this processing once. We don't need to keep trying
3911 to instantiate inline templates, because unit-at-a-time will make sure
3912 we get them compiled before functions that want to inline them. */
3913 if (DECL_ODR_USED (decl))
3916 /* If within finish_function, defer the rest until that function
3917 finishes, otherwise it might recurse. */
3918 if (defer_mark_used_calls)
3920 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
3924 /* Normally, we can wait until instantiation-time to synthesize
3925 DECL. However, if DECL is a static data member initialized with
3926 a constant, we need the value right now because a reference to
3927 such a data member is not value-dependent. */
3928 if (TREE_CODE (decl) == VAR_DECL
3929 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3930 && DECL_CLASS_SCOPE_P (decl))
3932 /* Don't try to instantiate members of dependent types. We
3933 cannot just use dependent_type_p here because this function
3934 may be called from fold_non_dependent_expr, and then we may
3935 see dependent types, even though processing_template_decl
3937 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3938 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3940 /* Pretend that we are not in a template, even if we are, so
3941 that the static data member initializer will be processed. */
3942 saved_processing_template_decl = processing_template_decl;
3943 processing_template_decl = 0;
3946 if (processing_template_decl)
3949 DECL_ODR_USED (decl) = 1;
3950 if (DECL_CLONED_FUNCTION_P (decl))
3951 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3953 /* DR 757: A type without linkage shall not be used as the type of a
3954 variable or function with linkage, unless
3955 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
3956 o the variable or function is not used (3.2 [basic.def.odr]) or is
3957 defined in the same translation unit. */
3958 if (TREE_PUBLIC (decl)
3959 && !DECL_EXTERN_C_P (decl)
3960 && !DECL_ARTIFICIAL (decl)
3961 && !decl_defined_p (decl)
3962 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
3964 if (is_local_extern (decl))
3965 /* There's no way to define a local extern, and adding it to
3966 the vector interferes with GC, so give an error now. */
3967 no_linkage_error (decl);
3969 VEC_safe_push (tree, gc, no_linkage_decls, decl);
3972 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3973 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
3974 /* Remember it, so we can check it was defined. */
3975 note_vague_linkage_fn (decl);
3977 /* Is it a synthesized method that needs to be synthesized? */
3978 if (TREE_CODE (decl) == FUNCTION_DECL
3979 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3980 && DECL_DEFAULTED_FN (decl)
3981 && ! DECL_INITIAL (decl))
3983 /* Remember the current location for a function we will end up
3984 synthesizing. Then we can inform the user where it was
3985 required in the case of error. */
3986 DECL_SOURCE_LOCATION (decl) = input_location;
3988 /* Synthesizing an implicitly defined member function will result in
3989 garbage collection. We must treat this situation as if we were
3990 within the body of a function so as to avoid collecting live data
3991 on the stack (such as overload resolution candidates).
3993 We could just let cp_write_global_declarations handle synthesizing
3994 this function, since we just added it to deferred_fns, but doing
3995 it at the use site produces better error messages. */
3997 synthesize_method (decl);
3999 /* If this is a synthesized method we don't need to
4000 do the instantiation test below. */
4002 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4003 && DECL_TEMPLATE_INFO (decl)
4004 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4005 || always_instantiate_p (decl)))
4006 /* If this is a function or variable that is an instance of some
4007 template, we now know that we will need to actually do the
4008 instantiation. We check that DECL is not an explicit
4009 instantiation because that is not checked in instantiate_decl.
4011 We put off instantiating functions in order to improve compile
4012 times. Maintaining a stack of active functions is expensive,
4013 and the inliner knows to instantiate any functions it might
4014 need. Therefore, we always try to defer instantiation. */
4015 instantiate_decl (decl, /*defer_ok=*/true,
4016 /*expl_inst_class_mem_p=*/false);
4018 processing_template_decl = saved_processing_template_decl;
4021 #include "gt-cp-decl2.h"