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, 2010,
4 2011 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"
44 #include "c-family/c-common.h"
45 #include "c-family/c-objc.h"
46 #include "tree-mudflap.h"
48 #include "tree-inline.h"
49 #include "c-family/c-pragma.h"
50 #include "tree-dump.h"
53 #include "pointer-set.h"
54 #include "splay-tree.h"
55 #include "langhooks.h"
56 #include "c-family/c-ada-spec.h"
58 extern cpp_reader *parse_in;
60 /* This structure contains information about the initializations
61 and/or destructions required for a particular priority level. */
62 typedef struct priority_info_s {
63 /* Nonzero if there have been any initializations at this priority
64 throughout the translation unit. */
65 int initializations_p;
66 /* Nonzero if there have been any destructions at this priority
67 throughout the translation unit. */
71 static void mark_vtable_entries (tree);
72 static bool maybe_emit_vtables (tree);
73 static bool acceptable_java_type (tree);
74 static tree start_objects (int, int);
75 static void finish_objects (int, int, tree);
76 static tree start_static_storage_duration_function (unsigned);
77 static void finish_static_storage_duration_function (tree);
78 static priority_info get_priority_info (int);
79 static void do_static_initialization_or_destruction (tree, bool);
80 static void one_static_initialization_or_destruction (tree, tree, bool);
81 static void generate_ctor_or_dtor_function (bool, int, location_t *);
82 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
84 static tree prune_vars_needing_no_initialization (tree *);
85 static void write_out_vars (tree);
86 static void import_export_class (tree);
87 static tree get_guard_bits (tree);
88 static void determine_visibility_from_class (tree, tree);
89 static bool decl_defined_p (tree);
91 /* A list of static class variables. This is needed, because a
92 static class variable can be declared inside the class without
93 an initializer, and then initialized, statically, outside the class. */
94 static GTY(()) VEC(tree,gc) *pending_statics;
96 /* A list of functions which were declared inline, but which we
97 may need to emit outline anyway. */
98 static GTY(()) VEC(tree,gc) *deferred_fns;
100 /* A list of decls that use types with no linkage, which we need to make
102 static GTY(()) VEC(tree,gc) *no_linkage_decls;
104 /* Nonzero if we're done parsing and into end-of-file activities. */
110 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
111 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
112 that apply to the function). */
115 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
121 if (fntype == error_mark_node || ctype == error_mark_node)
122 return error_mark_node;
124 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
125 || TREE_CODE (fntype) == METHOD_TYPE);
127 type_quals = quals & ~TYPE_QUAL_RESTRICT;
128 ctype = cp_build_qualified_type (ctype, type_quals);
129 raises = TYPE_RAISES_EXCEPTIONS (fntype);
130 attrs = TYPE_ATTRIBUTES (fntype);
131 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
132 (TREE_CODE (fntype) == METHOD_TYPE
133 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
134 : TYPE_ARG_TYPES (fntype)));
136 fntype = build_exception_variant (fntype, raises);
138 fntype = cp_build_type_attribute_variant (fntype, attrs);
143 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
144 return type changed to NEW_RET. */
147 change_return_type (tree new_ret, tree fntype)
150 tree args = TYPE_ARG_TYPES (fntype);
151 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
152 tree attrs = TYPE_ATTRIBUTES (fntype);
154 if (same_type_p (new_ret, TREE_TYPE (fntype)))
157 if (TREE_CODE (fntype) == FUNCTION_TYPE)
159 newtype = build_function_type (new_ret, args);
160 newtype = apply_memfn_quals (newtype, type_memfn_quals (fntype));
163 newtype = build_method_type_directly
164 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype))),
165 new_ret, TREE_CHAIN (args));
167 newtype = build_exception_variant (newtype, raises);
169 newtype = cp_build_type_attribute_variant (newtype, attrs);
174 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
178 cp_build_parm_decl (tree name, tree type)
180 tree parm = build_decl (input_location,
181 PARM_DECL, name, type);
182 /* DECL_ARG_TYPE is only used by the back end and the back end never
184 if (!processing_template_decl)
185 DECL_ARG_TYPE (parm) = type_passed_as (type);
187 /* If the type is a pack expansion, then we have a function
189 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
190 FUNCTION_PARAMETER_PACK_P (parm) = 1;
195 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
199 build_artificial_parm (tree name, tree type)
201 tree parm = cp_build_parm_decl (name, type);
202 DECL_ARTIFICIAL (parm) = 1;
203 /* All our artificial parms are implicitly `const'; they cannot be
205 TREE_READONLY (parm) = 1;
209 /* Constructors for types with virtual baseclasses need an "in-charge" flag
210 saying whether this constructor is responsible for initialization of
211 virtual baseclasses or not. All destructors also need this "in-charge"
212 flag, which additionally determines whether or not the destructor should
213 free the memory for the object.
215 This function adds the "in-charge" flag to member function FN if
216 appropriate. It is called from grokclassfn and tsubst.
217 FN must be either a constructor or destructor.
219 The in-charge flag follows the 'this' parameter, and is followed by the
220 VTT parm (if any), then the user-written parms. */
223 maybe_retrofit_in_chrg (tree fn)
225 tree basetype, arg_types, parms, parm, fntype;
227 /* If we've already add the in-charge parameter don't do it again. */
228 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
231 /* When processing templates we can't know, in general, whether or
232 not we're going to have virtual baseclasses. */
233 if (processing_template_decl)
236 /* We don't need an in-charge parameter for constructors that don't
237 have virtual bases. */
238 if (DECL_CONSTRUCTOR_P (fn)
239 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
242 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
243 basetype = TREE_TYPE (TREE_VALUE (arg_types));
244 arg_types = TREE_CHAIN (arg_types);
246 parms = DECL_CHAIN (DECL_ARGUMENTS (fn));
248 /* If this is a subobject constructor or destructor, our caller will
249 pass us a pointer to our VTT. */
250 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
252 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
254 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
255 DECL_CHAIN (parm) = parms;
258 /* ...and then to TYPE_ARG_TYPES. */
259 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
261 DECL_HAS_VTT_PARM_P (fn) = 1;
264 /* Then add the in-charge parm (before the VTT parm). */
265 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
266 DECL_CHAIN (parm) = parms;
268 arg_types = hash_tree_chain (integer_type_node, arg_types);
270 /* Insert our new parameter(s) into the list. */
271 DECL_CHAIN (DECL_ARGUMENTS (fn)) = parms;
273 /* And rebuild the function type. */
274 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
276 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
277 fntype = build_exception_variant (fntype,
278 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
279 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
280 fntype = (cp_build_type_attribute_variant
281 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
282 TREE_TYPE (fn) = fntype;
284 /* Now we've got the in-charge parameter. */
285 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
288 /* Classes overload their constituent function names automatically.
289 When a function name is declared in a record structure,
290 its name is changed to it overloaded name. Since names for
291 constructors and destructors can conflict, we place a leading
294 CNAME is the name of the class we are grokking for.
296 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
298 FLAGS contains bits saying what's special about today's
299 arguments. DTOR_FLAG == DESTRUCTOR.
301 If FUNCTION is a destructor, then we must add the `auto-delete' field
302 as a second parameter. There is some hair associated with the fact
303 that we must "declare" this variable in the manner consistent with the
304 way the rest of the arguments were declared.
306 QUALS are the qualifiers for the this pointer. */
309 grokclassfn (tree ctype, tree function, enum overload_flags flags)
311 tree fn_name = DECL_NAME (function);
313 /* Even within an `extern "C"' block, members get C++ linkage. See
314 [dcl.link] for details. */
315 SET_DECL_LANGUAGE (function, lang_cplusplus);
317 if (fn_name == NULL_TREE)
319 error ("name missing for member function");
320 fn_name = get_identifier ("<anonymous>");
321 DECL_NAME (function) = fn_name;
324 DECL_CONTEXT (function) = ctype;
326 if (flags == DTOR_FLAG)
327 DECL_DESTRUCTOR_P (function) = 1;
329 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
330 maybe_retrofit_in_chrg (function);
333 /* Create an ARRAY_REF, checking for the user doing things backwards
337 grok_array_decl (tree array_expr, tree index_exp)
341 tree orig_array_expr = array_expr;
342 tree orig_index_exp = index_exp;
344 if (error_operand_p (array_expr) || error_operand_p (index_exp))
345 return error_mark_node;
347 if (processing_template_decl)
349 if (type_dependent_expression_p (array_expr)
350 || type_dependent_expression_p (index_exp))
351 return build_min_nt (ARRAY_REF, array_expr, index_exp,
352 NULL_TREE, NULL_TREE);
353 array_expr = build_non_dependent_expr (array_expr);
354 index_exp = build_non_dependent_expr (index_exp);
357 type = TREE_TYPE (array_expr);
359 type = non_reference (type);
361 /* If they have an `operator[]', use that. */
362 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
363 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
364 array_expr, index_exp, NULL_TREE,
365 /*overloaded_p=*/NULL, tf_warning_or_error);
370 /* Otherwise, create an ARRAY_REF for a pointer or array type.
371 It is a little-known fact that, if `a' is an array and `i' is
372 an int, you can write `i[a]', which means the same thing as
374 if (TREE_CODE (type) == ARRAY_TYPE)
377 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
379 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
382 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
384 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
386 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
389 if ((p1 && i2) && (i1 && p2))
390 error ("ambiguous conversion for array subscript");
393 array_expr = p1, index_exp = i2;
395 array_expr = p2, index_exp = i1;
398 error ("invalid types %<%T[%T]%> for array subscript",
399 type, TREE_TYPE (index_exp));
400 return error_mark_node;
403 if (array_expr == error_mark_node || index_exp == error_mark_node)
404 error ("ambiguous conversion for array subscript");
406 expr = build_array_ref (input_location, array_expr, index_exp);
408 if (processing_template_decl && expr != error_mark_node)
409 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
410 NULL_TREE, NULL_TREE);
414 /* Given the cast expression EXP, checking out its validity. Either return
415 an error_mark_node if there was an unavoidable error, return a cast to
416 void for trying to delete a pointer w/ the value 0, or return the
417 call to delete. If DOING_VEC is true, we handle things differently
418 for doing an array delete.
419 Implements ARM $5.3.4. This is called from the parser. */
422 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete,
423 tsubst_flags_t complain)
427 if (exp == error_mark_node)
430 if (processing_template_decl)
432 t = build_min (DELETE_EXPR, void_type_node, exp, size);
433 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
434 DELETE_EXPR_USE_VEC (t) = doing_vec;
435 TREE_SIDE_EFFECTS (t) = 1;
439 /* An array can't have been allocated by new, so complain. */
440 if (TREE_CODE (exp) == VAR_DECL
441 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
442 warning (0, "deleting array %q#D", exp);
444 t = build_expr_type_conversion (WANT_POINTER, exp, true);
446 if (t == NULL_TREE || t == error_mark_node)
448 error ("type %q#T argument given to %<delete%>, expected pointer",
450 return error_mark_node;
453 type = TREE_TYPE (t);
455 /* As of Valley Forge, you can delete a pointer to const. */
457 /* You can't delete functions. */
458 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
460 error ("cannot delete a function. Only pointer-to-objects are "
461 "valid arguments to %<delete%>");
462 return error_mark_node;
465 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
466 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
468 warning (0, "deleting %qT is undefined", type);
472 /* Deleting a pointer with the value zero is valid and has no effect. */
473 if (integer_zerop (t))
474 return build1 (NOP_EXPR, void_type_node, t);
477 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
478 sfk_deleting_destructor,
479 use_global_delete, complain);
481 return build_delete (type, t, sfk_deleting_destructor,
482 LOOKUP_NORMAL, use_global_delete,
486 /* Report an error if the indicated template declaration is not the
487 sort of thing that should be a member template. */
490 check_member_template (tree tmpl)
494 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
495 decl = DECL_TEMPLATE_RESULT (tmpl);
497 if (TREE_CODE (decl) == FUNCTION_DECL
498 || (TREE_CODE (decl) == TYPE_DECL
499 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
501 /* The parser rejects template declarations in local classes. */
502 gcc_assert (!current_function_decl);
503 /* The parser rejects any use of virtual in a function template. */
504 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
505 && DECL_VIRTUAL_P (decl)));
507 /* The debug-information generating code doesn't know what to do
508 with member templates. */
509 DECL_IGNORED_P (tmpl) = 1;
512 error ("template declaration of %q#D", decl);
515 /* Return true iff TYPE is a valid Java parameter or return type. */
518 acceptable_java_type (tree type)
520 if (type == error_mark_node)
523 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
525 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
527 type = TREE_TYPE (type);
528 if (TREE_CODE (type) == RECORD_TYPE)
531 if (! TYPE_FOR_JAVA (type))
533 if (! CLASSTYPE_TEMPLATE_INFO (type))
535 args = CLASSTYPE_TI_ARGS (type);
536 i = TREE_VEC_LENGTH (args);
539 type = TREE_VEC_ELT (args, i);
540 if (TREE_CODE (type) == POINTER_TYPE)
541 type = TREE_TYPE (type);
542 if (! TYPE_FOR_JAVA (type))
551 /* For a METHOD in a Java class CTYPE, return true if
552 the parameter and return types are valid Java types.
553 Otherwise, print appropriate error messages, and return false. */
556 check_java_method (tree method)
559 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
560 tree ret_type = TREE_TYPE (TREE_TYPE (method));
562 if (!acceptable_java_type (ret_type))
564 error ("Java method %qD has non-Java return type %qT",
569 arg_types = TREE_CHAIN (arg_types);
570 if (DECL_HAS_IN_CHARGE_PARM_P (method))
571 arg_types = TREE_CHAIN (arg_types);
572 if (DECL_HAS_VTT_PARM_P (method))
573 arg_types = TREE_CHAIN (arg_types);
575 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
577 tree type = TREE_VALUE (arg_types);
578 if (!acceptable_java_type (type))
580 if (type != error_mark_node)
581 error ("Java method %qD has non-Java parameter type %qT",
589 /* Sanity check: report error if this function FUNCTION is not
590 really a member of the class (CTYPE) it is supposed to belong to.
591 TEMPLATE_PARMS is used to specify the template parameters of a member
592 template passed as FUNCTION_DECL. If the member template is passed as a
593 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
594 from the declaration. If the function is not a function template, it
596 It returns the original declaration for the function, NULL_TREE if
597 no declaration was found, error_mark_node if an error was emitted. */
600 check_classfn (tree ctype, tree function, tree template_parms)
606 if (DECL_USE_TEMPLATE (function)
607 && !(TREE_CODE (function) == TEMPLATE_DECL
608 && DECL_TEMPLATE_SPECIALIZATION (function))
609 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
610 /* Since this is a specialization of a member template,
611 we're not going to find the declaration in the class.
614 struct S { template <typename T> void f(T); };
615 template <> void S::f(int);
617 we're not going to find `S::f(int)', but there's no
618 reason we should, either. We let our callers know we didn't
619 find the method, but we don't complain. */
622 /* Basic sanity check: for a template function, the template parameters
623 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
624 if (TREE_CODE (function) == TEMPLATE_DECL)
627 && !comp_template_parms (template_parms,
628 DECL_TEMPLATE_PARMS (function)))
630 error ("template parameter lists provided don%'t match the "
631 "template parameters of %qD", function);
632 return error_mark_node;
634 template_parms = DECL_TEMPLATE_PARMS (function);
637 /* OK, is this a definition of a member template? */
638 is_template = (template_parms != NULL_TREE);
640 /* We must enter the scope here, because conversion operators are
641 named by target type, and type equivalence relies on typenames
642 resolving within the scope of CTYPE. */
643 pushed_scope = push_scope (ctype);
644 ix = class_method_index_for_fn (complete_type (ctype), function);
647 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
648 tree fndecls, fndecl = 0;
650 const char *format = NULL;
652 for (fndecls = VEC_index (tree, methods, ix);
653 fndecls; fndecls = OVL_NEXT (fndecls))
657 fndecl = OVL_CURRENT (fndecls);
658 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
659 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
661 /* We cannot simply call decls_match because this doesn't
662 work for static member functions that are pretending to
663 be methods, and because the name may have been changed by
666 /* Get rid of the this parameter on functions that become
668 if (DECL_STATIC_FUNCTION_P (fndecl)
669 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
670 p1 = TREE_CHAIN (p1);
672 /* A member template definition only matches a member template
674 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
677 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
678 TREE_TYPE (TREE_TYPE (fndecl)))
679 && compparms (p1, p2)
681 || comp_template_parms (template_parms,
682 DECL_TEMPLATE_PARMS (fndecl)))
683 && (DECL_TEMPLATE_SPECIALIZATION (function)
684 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
685 && (!DECL_TEMPLATE_SPECIALIZATION (function)
686 || (DECL_TI_TEMPLATE (function)
687 == DECL_TI_TEMPLATE (fndecl))))
693 pop_scope (pushed_scope);
694 return OVL_CURRENT (fndecls);
697 error_at (DECL_SOURCE_LOCATION (function),
698 "prototype for %q#D does not match any in class %qT",
700 is_conv_op = DECL_CONV_FN_P (fndecl);
703 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
704 fndecls = VEC_index (tree, methods, ix);
707 fndecl = OVL_CURRENT (fndecls);
708 fndecls = OVL_NEXT (fndecls);
710 if (!fndecls && is_conv_op)
712 if (VEC_length (tree, methods) > (size_t) ++ix)
714 fndecls = VEC_index (tree, methods, ix);
715 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
727 format = N_("candidates are: %+#D");
729 format = N_("candidate is: %+#D");
730 error (format, fndecl);
733 else if (!COMPLETE_TYPE_P (ctype))
734 cxx_incomplete_type_error (function, ctype);
736 error ("no %q#D member function declared in class %qT",
740 pop_scope (pushed_scope);
741 return error_mark_node;
744 /* DECL is a function with vague linkage. Remember it so that at the
745 end of the translation unit we can decide whether or not to emit
749 note_vague_linkage_fn (tree decl)
751 DECL_DEFER_OUTPUT (decl) = 1;
752 VEC_safe_push (tree, gc, deferred_fns, decl);
755 /* We have just processed the DECL, which is a static data member.
756 The other parameters are as for cp_finish_decl. */
759 finish_static_data_member_decl (tree decl,
760 tree init, bool init_const_expr_p,
764 DECL_CONTEXT (decl) = current_class_type;
766 /* We cannot call pushdecl here, because that would fill in the
767 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
768 the right thing, namely, to put this decl out straight away. */
770 if (! processing_template_decl)
771 VEC_safe_push (tree, gc, pending_statics, decl);
773 if (LOCAL_CLASS_P (current_class_type))
774 permerror (input_location, "local class %q#T shall not have static data member %q#D",
775 current_class_type, decl);
777 DECL_IN_AGGR_P (decl) = 1;
779 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
780 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
781 SET_VAR_HAD_UNKNOWN_BOUND (decl);
783 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
786 /* DECLARATOR and DECLSPECS correspond to a class member. The other
787 parameters are as for cp_finish_decl. Return the DECL for the
788 class member declared. */
791 grokfield (const cp_declarator *declarator,
792 cp_decl_specifier_seq *declspecs,
793 tree init, bool init_const_expr_p,
798 const char *asmspec = 0;
799 int flags = LOOKUP_ONLYCONVERTING;
803 && TREE_CODE (init) == TREE_LIST
804 && TREE_VALUE (init) == error_mark_node
805 && TREE_CHAIN (init) == NULL_TREE)
808 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
809 if (! value || error_operand_p (value))
810 /* friend or constructor went bad. */
811 return error_mark_node;
813 if (TREE_CODE (value) == TYPE_DECL && init)
815 error ("typedef %qD is initialized (use decltype instead)", value);
819 /* Pass friendly classes back. */
820 if (value == void_type_node)
823 /* Pass friend decls back. */
824 if ((TREE_CODE (value) == FUNCTION_DECL
825 || TREE_CODE (value) == TEMPLATE_DECL)
826 && DECL_CONTEXT (value) != current_class_type)
829 name = DECL_NAME (value);
831 if (name != NULL_TREE)
833 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
835 error ("explicit template argument list not allowed");
836 return error_mark_node;
839 if (IDENTIFIER_POINTER (name)[0] == '_'
840 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
841 error ("member %qD conflicts with virtual function table field name",
845 /* Stash away type declarations. */
846 if (TREE_CODE (value) == TYPE_DECL)
848 DECL_NONLOCAL (value) = 1;
849 DECL_CONTEXT (value) = current_class_type;
851 if (processing_template_decl)
852 value = push_template_decl (value);
858 /* If this is a typedef that names the class for linkage purposes
859 (7.1.3p8), apply any attributes directly to the type. */
860 if (TAGGED_TYPE_P (TREE_TYPE (value))
861 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
862 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
864 cplus_decl_attributes (&value, attrlist, attrflags);
867 if (declspecs->specs[(int)ds_typedef]
868 && TREE_TYPE (value) != error_mark_node
869 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
870 set_underlying_type (value);
875 if (DECL_IN_AGGR_P (value))
877 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
878 return void_type_node;
881 if (asmspec_tree && asmspec_tree != error_mark_node)
882 asmspec = TREE_STRING_POINTER (asmspec_tree);
886 if (TREE_CODE (value) == FUNCTION_DECL)
888 /* Initializers for functions are rejected early in the parser.
889 If we get here, it must be a pure specifier for a method. */
890 if (init == ridpointers[(int)RID_DELETE])
892 DECL_DELETED_FN (value) = 1;
893 DECL_DECLARED_INLINE_P (value) = 1;
894 DECL_INITIAL (value) = error_mark_node;
896 else if (init == ridpointers[(int)RID_DEFAULT])
898 if (defaultable_fn_check (value))
900 DECL_DEFAULTED_FN (value) = 1;
901 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
902 DECL_DECLARED_INLINE_P (value) = 1;
905 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
907 if (integer_zerop (init))
908 DECL_PURE_VIRTUAL_P (value) = 1;
909 else if (error_operand_p (init))
910 ; /* An error has already been reported. */
912 error ("invalid initializer for member function %qD",
917 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
918 error ("initializer specified for static member function %qD",
922 else if (pedantic && TREE_CODE (value) != VAR_DECL)
923 /* Already complained in grokdeclarator. */
925 else if (!processing_template_decl)
927 if (TREE_CODE (init) == CONSTRUCTOR)
928 init = digest_init (TREE_TYPE (value), init);
929 init = maybe_constant_init (init);
931 if (init != error_mark_node && !TREE_CONSTANT (init))
933 /* We can allow references to things that are effectively
934 static, since references are initialized with the
936 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
937 || (TREE_STATIC (init) == 0
938 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
940 error ("field initializer is not constant");
941 init = error_mark_node;
947 if (processing_template_decl
948 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
950 value = push_template_decl (value);
951 if (error_operand_p (value))
952 return error_mark_node;
956 cplus_decl_attributes (&value, attrlist, 0);
958 switch (TREE_CODE (value))
961 finish_static_data_member_decl (value, init, init_const_expr_p,
962 asmspec_tree, flags);
967 error ("%<asm%> specifiers are not permitted on non-static data members");
968 if (DECL_INITIAL (value) == error_mark_node)
969 init = error_mark_node;
970 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
972 DECL_INITIAL (value) = init;
973 DECL_IN_AGGR_P (value) = 1;
978 set_user_assembler_name (value, asmspec);
980 cp_finish_decl (value,
982 /*init_const_expr_p=*/false,
983 asmspec_tree, flags);
985 /* Pass friends back this way. */
986 if (DECL_FRIEND_P (value))
987 return void_type_node;
989 DECL_IN_AGGR_P (value) = 1;
998 /* Like `grokfield', but for bitfields.
999 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1002 grokbitfield (const cp_declarator *declarator,
1003 cp_decl_specifier_seq *declspecs, tree width,
1006 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1008 if (value == error_mark_node)
1009 return NULL_TREE; /* friends went bad. */
1011 /* Pass friendly classes back. */
1012 if (TREE_CODE (value) == VOID_TYPE)
1013 return void_type_node;
1015 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
1016 && (POINTER_TYPE_P (value)
1017 || !dependent_type_p (TREE_TYPE (value))))
1019 error ("bit-field %qD with non-integral type", value);
1020 return error_mark_node;
1023 if (TREE_CODE (value) == TYPE_DECL)
1025 error ("cannot declare %qD to be a bit-field type", value);
1029 /* Usually, finish_struct_1 catches bitfields with invalid types.
1030 But, in the case of bitfields with function type, we confuse
1031 ourselves into thinking they are member functions, so we must
1033 if (TREE_CODE (value) == FUNCTION_DECL)
1035 error ("cannot declare bit-field %qD with function type",
1040 if (DECL_IN_AGGR_P (value))
1042 error ("%qD is already defined in the class %qT", value,
1043 DECL_CONTEXT (value));
1044 return void_type_node;
1047 if (TREE_STATIC (value))
1049 error ("static member %qD cannot be a bit-field", value);
1052 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1054 if (width != error_mark_node)
1056 /* The width must be an integer type. */
1057 if (!type_dependent_expression_p (width)
1058 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width)))
1059 error ("width of bit-field %qD has non-integral type %qT", value,
1061 DECL_INITIAL (value) = width;
1062 SET_DECL_C_BIT_FIELD (value);
1065 DECL_IN_AGGR_P (value) = 1;
1068 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1074 /* Returns true iff ATTR is an attribute which needs to be applied at
1075 instantiation time rather than template definition time. */
1078 is_late_template_attribute (tree attr, tree decl)
1080 tree name = TREE_PURPOSE (attr);
1081 tree args = TREE_VALUE (attr);
1082 const struct attribute_spec *spec = lookup_attribute_spec (name);
1086 /* Unknown attribute. */
1089 /* Attribute weak handling wants to write out assembly right away. */
1090 if (is_attribute_p ("weak", name))
1093 /* If any of the arguments are dependent expressions, we can't evaluate
1094 the attribute until instantiation time. */
1095 for (arg = args; arg; arg = TREE_CHAIN (arg))
1097 tree t = TREE_VALUE (arg);
1099 /* If the first attribute argument is an identifier, only consider
1100 second and following arguments. Attributes like mode, format,
1101 cleanup and several target specific attributes aren't late
1102 just because they have an IDENTIFIER_NODE as first argument. */
1103 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1106 if (value_dependent_expression_p (t)
1107 || type_dependent_expression_p (t))
1111 if (TREE_CODE (decl) == TYPE_DECL
1113 || spec->type_required)
1115 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1117 /* We can't apply any attributes to a completely unknown type until
1118 instantiation time. */
1119 enum tree_code code = TREE_CODE (type);
1120 if (code == TEMPLATE_TYPE_PARM
1121 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1122 || code == TYPENAME_TYPE)
1124 /* Also defer most attributes on dependent types. This is not
1125 necessary in all cases, but is the better default. */
1126 else if (dependent_type_p (type)
1127 /* But attribute visibility specifically works on
1129 && !is_attribute_p ("visibility", name))
1138 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1139 applied at instantiation time and return them. If IS_DEPENDENT is true,
1140 the declaration itself is dependent, so all attributes should be applied
1141 at instantiation time. */
1144 splice_template_attributes (tree *attr_p, tree decl)
1147 tree late_attrs = NULL_TREE;
1148 tree *q = &late_attrs;
1155 if (is_late_template_attribute (*p, decl))
1157 ATTR_IS_DEPENDENT (*p) = 1;
1159 *p = TREE_CHAIN (*p);
1160 q = &TREE_CHAIN (*q);
1164 p = &TREE_CHAIN (*p);
1170 /* Remove any late attributes from the list in ATTR_P and attach them to
1174 save_template_attributes (tree *attr_p, tree *decl_p)
1176 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1178 tree old_attrs = NULL_TREE;
1183 if (DECL_P (*decl_p))
1184 q = &DECL_ATTRIBUTES (*decl_p);
1186 q = &TYPE_ATTRIBUTES (*decl_p);
1190 /* Place the late attributes at the beginning of the attribute
1192 TREE_CHAIN (tree_last (late_attrs)) = *q;
1195 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1197 /* We've added new attributes directly to the main variant, so
1198 now we need to update all of the other variants to include
1199 these new attributes. */
1201 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1202 variant = TYPE_NEXT_VARIANT (variant))
1204 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1205 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1210 /* Like reconstruct_complex_type, but handle also template trees. */
1213 cp_reconstruct_complex_type (tree type, tree bottom)
1217 if (TREE_CODE (type) == POINTER_TYPE)
1219 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1220 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1221 TYPE_REF_CAN_ALIAS_ALL (type));
1223 else if (TREE_CODE (type) == REFERENCE_TYPE)
1225 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1226 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1227 TYPE_REF_CAN_ALIAS_ALL (type));
1229 else if (TREE_CODE (type) == ARRAY_TYPE)
1231 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1232 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1233 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1234 element type qualification will be handled by the recursive
1235 cp_reconstruct_complex_type call and cp_build_qualified_type
1236 for ARRAY_TYPEs changes the element type. */
1239 else if (TREE_CODE (type) == FUNCTION_TYPE)
1241 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1242 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1243 outer = apply_memfn_quals (outer, type_memfn_quals (type));
1245 else if (TREE_CODE (type) == METHOD_TYPE)
1247 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1248 /* The build_method_type_directly() routine prepends 'this' to argument list,
1249 so we must compensate by getting rid of it. */
1251 = build_method_type_directly
1252 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1254 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1256 else if (TREE_CODE (type) == OFFSET_TYPE)
1258 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1259 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1264 if (TYPE_ATTRIBUTES (type))
1265 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1266 return cp_build_qualified_type (outer, cp_type_quals (type));
1269 /* Replaces any constexpr expression that may be into the attributes
1270 arguments with their reduced value. */
1273 cp_check_const_attributes (tree attributes)
1276 for (attr = attributes; attr; attr = TREE_CHAIN (attr))
1279 for (arg = TREE_VALUE (attr); arg; arg = TREE_CHAIN (arg))
1281 tree expr = TREE_VALUE (arg);
1283 TREE_VALUE (arg) = maybe_constant_value (expr);
1288 /* Like decl_attributes, but handle C++ complexity. */
1291 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1293 if (*decl == NULL_TREE || *decl == void_type_node
1294 || *decl == error_mark_node
1295 || attributes == NULL_TREE)
1298 if (processing_template_decl)
1300 if (check_for_bare_parameter_packs (attributes))
1303 save_template_attributes (&attributes, decl);
1304 if (attributes == NULL_TREE)
1308 cp_check_const_attributes (attributes);
1310 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1311 decl = &DECL_TEMPLATE_RESULT (*decl);
1313 decl_attributes (decl, attributes, flags);
1315 if (TREE_CODE (*decl) == TYPE_DECL)
1316 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1319 /* Walks through the namespace- or function-scope anonymous union
1320 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1321 Returns one of the fields for use in the mangled name. */
1324 build_anon_union_vars (tree type, tree object)
1326 tree main_decl = NULL_TREE;
1329 /* Rather than write the code to handle the non-union case,
1330 just give an error. */
1331 if (TREE_CODE (type) != UNION_TYPE)
1332 error ("anonymous struct not inside named type");
1334 for (field = TYPE_FIELDS (type);
1336 field = DECL_CHAIN (field))
1341 if (DECL_ARTIFICIAL (field))
1343 if (TREE_CODE (field) != FIELD_DECL)
1345 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1346 "have non-static data members", field);
1350 if (TREE_PRIVATE (field))
1351 permerror (input_location, "private member %q+#D in anonymous union", field);
1352 else if (TREE_PROTECTED (field))
1353 permerror (input_location, "protected member %q+#D in anonymous union", field);
1355 if (processing_template_decl)
1356 ref = build_min_nt (COMPONENT_REF, object,
1357 DECL_NAME (field), NULL_TREE);
1359 ref = build_class_member_access_expr (object, field, NULL_TREE,
1360 false, tf_warning_or_error);
1362 if (DECL_NAME (field))
1366 decl = build_decl (input_location,
1367 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1368 DECL_ANON_UNION_VAR_P (decl) = 1;
1369 DECL_ARTIFICIAL (decl) = 1;
1371 base = get_base_address (object);
1372 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1373 TREE_STATIC (decl) = TREE_STATIC (base);
1374 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1376 SET_DECL_VALUE_EXPR (decl, ref);
1377 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1379 decl = pushdecl (decl);
1381 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1382 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1386 if (main_decl == NULL_TREE)
1393 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1394 anonymous union, then all members must be laid out together. PUBLIC_P
1395 is nonzero if this union is not declared static. */
1398 finish_anon_union (tree anon_union_decl)
1404 if (anon_union_decl == error_mark_node)
1407 type = TREE_TYPE (anon_union_decl);
1408 public_p = TREE_PUBLIC (anon_union_decl);
1410 /* The VAR_DECL's context is the same as the TYPE's context. */
1411 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1413 if (TYPE_FIELDS (type) == NULL_TREE)
1418 error ("namespace-scope anonymous aggregates must be static");
1422 main_decl = build_anon_union_vars (type, anon_union_decl);
1423 if (main_decl == error_mark_node)
1425 if (main_decl == NULL_TREE)
1427 warning (0, "anonymous union with no members");
1431 if (!processing_template_decl)
1433 /* Use main_decl to set the mangled name. */
1434 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1435 maybe_commonize_var (anon_union_decl);
1436 if (TREE_STATIC (anon_union_decl) || DECL_EXTERNAL (anon_union_decl))
1437 mangle_decl (anon_union_decl);
1438 DECL_NAME (anon_union_decl) = NULL_TREE;
1441 pushdecl (anon_union_decl);
1442 if (building_stmt_tree ()
1443 && at_function_scope_p ())
1444 add_decl_expr (anon_union_decl);
1445 else if (!processing_template_decl)
1446 rest_of_decl_compilation (anon_union_decl,
1447 toplevel_bindings_p (), at_eof);
1450 /* Auxiliary functions to make type signatures for
1451 `operator new' and `operator delete' correspond to
1452 what compiler will be expecting. */
1455 coerce_new_type (tree type)
1458 tree args = TYPE_ARG_TYPES (type);
1460 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1462 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1465 error ("%<operator new%> must return type %qT", ptr_type_node);
1468 if (args && args != void_list_node)
1470 if (TREE_PURPOSE (args))
1472 /* [basic.stc.dynamic.allocation]
1474 The first parameter shall not have an associated default
1476 error ("the first parameter of %<operator new%> cannot "
1477 "have a default argument");
1478 /* Throw away the default argument. */
1479 TREE_PURPOSE (args) = NULL_TREE;
1482 if (!same_type_p (TREE_VALUE (args), size_type_node))
1485 args = TREE_CHAIN (args);
1492 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1493 "as first parameter", size_type_node);
1498 args = tree_cons (NULL_TREE, size_type_node, args);
1501 type = build_exception_variant
1502 (build_function_type (ptr_type_node, args),
1503 TYPE_RAISES_EXCEPTIONS (type));
1511 coerce_delete_type (tree type)
1514 tree args = TYPE_ARG_TYPES (type);
1516 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1518 if (!same_type_p (TREE_TYPE (type), void_type_node))
1521 error ("%<operator delete%> must return type %qT", void_type_node);
1524 if (!args || args == void_list_node
1525 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1528 if (args && args != void_list_node)
1529 args = TREE_CHAIN (args);
1530 error ("%<operator delete%> takes type %qT as first parameter",
1536 args = tree_cons (NULL_TREE, ptr_type_node, args);
1539 type = build_exception_variant
1540 (build_function_type (void_type_node, args),
1541 TYPE_RAISES_EXCEPTIONS (type));
1549 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1550 and mark them as needed. */
1553 mark_vtable_entries (tree decl)
1556 unsigned HOST_WIDE_INT idx;
1558 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1563 STRIP_NOPS (fnaddr);
1565 if (TREE_CODE (fnaddr) != ADDR_EXPR
1566 && TREE_CODE (fnaddr) != FDESC_EXPR)
1567 /* This entry is an offset: a virtual base class offset, a
1568 virtual call offset, an RTTI offset, etc. */
1571 fn = TREE_OPERAND (fnaddr, 0);
1572 TREE_ADDRESSABLE (fn) = 1;
1573 /* When we don't have vcall offsets, we output thunks whenever
1574 we output the vtables that contain them. With vcall offsets,
1575 we know all the thunks we'll need when we emit a virtual
1576 function, so we emit the thunks there instead. */
1577 if (DECL_THUNK_P (fn))
1578 use_thunk (fn, /*emit_p=*/0);
1583 /* Set DECL up to have the closest approximation of "initialized common"
1584 linkage available. */
1587 comdat_linkage (tree decl)
1590 make_decl_one_only (decl, cxx_comdat_group (decl));
1591 else if (TREE_CODE (decl) == FUNCTION_DECL
1592 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1593 /* We can just emit function and compiler-generated variables
1594 statically; having multiple copies is (for the most part) only
1597 There are two correctness issues, however: the address of a
1598 template instantiation with external linkage should be the
1599 same, independent of what translation unit asks for the
1600 address, and this will not hold when we emit multiple copies of
1601 the function. However, there's little else we can do.
1603 Also, by default, the typeinfo implementation assumes that
1604 there will be only one copy of the string used as the name for
1605 each type. Therefore, if weak symbols are unavailable, the
1606 run-time library should perform a more conservative check; it
1607 should perform a string comparison, rather than an address
1609 TREE_PUBLIC (decl) = 0;
1612 /* Static data member template instantiations, however, cannot
1613 have multiple copies. */
1614 if (DECL_INITIAL (decl) == 0
1615 || DECL_INITIAL (decl) == error_mark_node)
1616 DECL_COMMON (decl) = 1;
1617 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1619 DECL_COMMON (decl) = 1;
1620 DECL_INITIAL (decl) = error_mark_node;
1622 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1624 /* We can't do anything useful; leave vars for explicit
1626 DECL_EXTERNAL (decl) = 1;
1627 DECL_NOT_REALLY_EXTERN (decl) = 0;
1631 DECL_COMDAT (decl) = 1;
1634 /* For win32 we also want to put explicit instantiations in
1635 linkonce sections, so that they will be merged with implicit
1636 instantiations; otherwise we get duplicate symbol errors.
1637 For Darwin we do not want explicit instantiations to be
1641 maybe_make_one_only (tree decl)
1643 /* We used to say that this was not necessary on targets that support weak
1644 symbols, because the implicit instantiations will defer to the explicit
1645 one. However, that's not actually the case in SVR4; a strong definition
1646 after a weak one is an error. Also, not making explicit
1647 instantiations one_only means that we can end up with two copies of
1648 some template instantiations. */
1652 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1653 we can get away with not emitting them if they aren't used. We need
1654 to for variables so that cp_finish_decl will update their linkage,
1655 because their DECL_INITIAL may not have been set properly yet. */
1657 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1658 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1659 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1661 make_decl_one_only (decl, cxx_comdat_group (decl));
1663 if (TREE_CODE (decl) == VAR_DECL)
1665 DECL_COMDAT (decl) = 1;
1666 /* Mark it needed so we don't forget to emit it. */
1667 mark_decl_referenced (decl);
1672 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1673 This predicate will give the right answer during parsing of the
1674 function, which other tests may not. */
1677 vague_linkage_p (tree decl)
1679 /* Unfortunately, import_export_decl has not always been called
1680 before the function is processed, so we cannot simply check
1682 return (DECL_COMDAT (decl)
1683 || (((TREE_CODE (decl) == FUNCTION_DECL
1684 && DECL_DECLARED_INLINE_P (decl))
1685 || (DECL_LANG_SPECIFIC (decl)
1686 && DECL_TEMPLATE_INSTANTIATION (decl)))
1687 && TREE_PUBLIC (decl)));
1690 /* Determine whether or not we want to specifically import or export CTYPE,
1691 using various heuristics. */
1694 import_export_class (tree ctype)
1696 /* -1 for imported, 1 for exported. */
1697 int import_export = 0;
1699 /* It only makes sense to call this function at EOF. The reason is
1700 that this function looks at whether or not the first non-inline
1701 non-abstract virtual member function has been defined in this
1702 translation unit. But, we can't possibly know that until we've
1703 seen the entire translation unit. */
1704 gcc_assert (at_eof);
1706 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1709 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1710 we will have CLASSTYPE_INTERFACE_ONLY set but not
1711 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1712 heuristic because someone will supply a #pragma implementation
1713 elsewhere, and deducing it here would produce a conflict. */
1714 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1717 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1719 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1721 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1722 && !flag_implicit_templates)
1723 /* For a template class, without -fimplicit-templates, check the
1724 repository. If the virtual table is assigned to this
1725 translation unit, then export the class; otherwise, import
1727 import_export = repo_export_class_p (ctype) ? 1 : -1;
1728 else if (TYPE_POLYMORPHIC_P (ctype))
1730 /* The ABI specifies that the virtual table and associated
1731 information are emitted with the key method, if any. */
1732 tree method = CLASSTYPE_KEY_METHOD (ctype);
1733 /* If weak symbol support is not available, then we must be
1734 careful not to emit the vtable when the key function is
1735 inline. An inline function can be defined in multiple
1736 translation units. If we were to emit the vtable in each
1737 translation unit containing a definition, we would get
1738 multiple definition errors at link-time. */
1739 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1740 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1743 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1744 a definition anywhere else. */
1745 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1748 /* Allow back ends the chance to overrule the decision. */
1749 if (targetm.cxx.import_export_class)
1750 import_export = targetm.cxx.import_export_class (ctype, import_export);
1754 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1755 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1759 /* Return true if VAR has already been provided to the back end; in that
1760 case VAR should not be modified further by the front end. */
1762 var_finalized_p (tree var)
1764 return varpool_node (var)->finalized;
1767 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1768 must be emitted in this translation unit. Mark it as such. */
1771 mark_needed (tree decl)
1773 /* It's possible that we no longer need to set
1774 TREE_SYMBOL_REFERENCED here directly, but doing so is
1776 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1777 mark_decl_referenced (decl);
1780 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1781 returns true if a definition of this entity should be provided in
1782 this object file. Callers use this function to determine whether
1783 or not to let the back end know that a definition of DECL is
1784 available in this translation unit. */
1787 decl_needed_p (tree decl)
1789 gcc_assert (TREE_CODE (decl) == VAR_DECL
1790 || TREE_CODE (decl) == FUNCTION_DECL);
1791 /* This function should only be called at the end of the translation
1792 unit. We cannot be sure of whether or not something will be
1793 COMDAT until that point. */
1794 gcc_assert (at_eof);
1796 /* All entities with external linkage that are not COMDAT should be
1797 emitted; they may be referred to from other object files. */
1798 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1800 /* If this entity was used, let the back end see it; it will decide
1801 whether or not to emit it into the object file. */
1802 if (TREE_USED (decl)
1803 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1804 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1806 /* Functions marked "dllexport" must be emitted so that they are
1807 visible to other DLLs. */
1808 if (flag_keep_inline_dllexport
1809 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1811 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1812 reference to DECL might cause it to be emitted later. */
1816 /* If necessary, write out the vtables for the dynamic class CTYPE.
1817 Returns true if any vtables were emitted. */
1820 maybe_emit_vtables (tree ctype)
1825 struct varpool_node *current = NULL, *last = NULL, *first = NULL;
1827 /* If the vtables for this class have already been emitted there is
1828 nothing more to do. */
1829 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1830 if (var_finalized_p (primary_vtbl))
1832 /* Ignore dummy vtables made by get_vtable_decl. */
1833 if (TREE_TYPE (primary_vtbl) == void_type_node)
1836 /* On some targets, we cannot determine the key method until the end
1837 of the translation unit -- which is when this function is
1839 if (!targetm.cxx.key_method_may_be_inline ())
1840 determine_key_method (ctype);
1842 /* See if any of the vtables are needed. */
1843 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1845 import_export_decl (vtbl);
1846 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1851 /* If the references to this class' vtables are optimized away,
1852 still emit the appropriate debugging information. See
1854 if (DECL_COMDAT (primary_vtbl)
1855 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1856 note_debug_info_needed (ctype);
1860 /* The ABI requires that we emit all of the vtables if we emit any
1862 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1864 /* Mark entities references from the virtual table as used. */
1865 mark_vtable_entries (vtbl);
1867 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1869 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1871 /* It had better be all done at compile-time. */
1876 DECL_EXTERNAL (vtbl) = 0;
1877 rest_of_decl_compilation (vtbl, 1, 1);
1879 /* Because we're only doing syntax-checking, we'll never end up
1880 actually marking the variable as written. */
1881 if (flag_syntax_only)
1882 TREE_ASM_WRITTEN (vtbl) = 1;
1883 else if (DECL_COMDAT (vtbl))
1885 current = varpool_node (vtbl);
1887 last->same_comdat_group = current;
1895 last->same_comdat_group = first;
1897 /* Since we're writing out the vtable here, also write the debug
1899 note_debug_info_needed (ctype);
1904 /* A special return value from type_visibility meaning internal
1907 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1909 /* walk_tree helper function for type_visibility. */
1912 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1914 int *vis_p = (int *)data;
1919 else if (CLASS_TYPE_P (*tp))
1921 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1923 *vis_p = VISIBILITY_ANON;
1926 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1927 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1932 /* Returns the visibility of TYPE, which is the minimum visibility of its
1936 type_visibility (tree type)
1938 int vis = VISIBILITY_DEFAULT;
1939 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1943 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1944 specified (or if VISIBILITY is static). */
1947 constrain_visibility (tree decl, int visibility)
1949 if (visibility == VISIBILITY_ANON)
1951 /* extern "C" declarations aren't affected by the anonymous
1953 if (!DECL_EXTERN_C_P (decl))
1955 TREE_PUBLIC (decl) = 0;
1956 DECL_WEAK (decl) = 0;
1957 DECL_COMMON (decl) = 0;
1958 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1959 DECL_INTERFACE_KNOWN (decl) = 1;
1960 if (DECL_LANG_SPECIFIC (decl))
1961 DECL_NOT_REALLY_EXTERN (decl) = 1;
1964 else if (visibility > DECL_VISIBILITY (decl)
1965 && !DECL_VISIBILITY_SPECIFIED (decl))
1967 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1973 /* Constrain the visibility of DECL based on the visibility of its template
1977 constrain_visibility_for_template (tree decl, tree targs)
1979 /* If this is a template instantiation, check the innermost
1980 template args for visibility constraints. The outer template
1981 args are covered by the class check. */
1982 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1984 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1988 tree arg = TREE_VEC_ELT (args, i-1);
1990 vis = type_visibility (arg);
1991 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1994 if (TREE_CODE (arg) == ADDR_EXPR)
1995 arg = TREE_OPERAND (arg, 0);
1996 if (TREE_CODE (arg) == VAR_DECL
1997 || TREE_CODE (arg) == FUNCTION_DECL)
1999 if (! TREE_PUBLIC (arg))
2000 vis = VISIBILITY_ANON;
2002 vis = DECL_VISIBILITY (arg);
2006 constrain_visibility (decl, vis);
2010 /* Like c_determine_visibility, but with additional C++-specific
2013 Function-scope entities can rely on the function's visibility because
2014 it is set in start_preparsed_function.
2016 Class-scope entities cannot rely on the class's visibility until the end
2017 of the enclosing class definition.
2019 Note that because namespaces have multiple independent definitions,
2020 namespace visibility is handled elsewhere using the #pragma visibility
2021 machinery rather than by decorating the namespace declaration.
2023 The goal is for constraints from the type to give a diagnostic, and
2024 other constraints to be applied silently. */
2027 determine_visibility (tree decl)
2029 tree class_type = NULL_TREE;
2031 bool orig_visibility_specified;
2032 enum symbol_visibility orig_visibility;
2034 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2036 /* Only relevant for names with external linkage. */
2037 if (!TREE_PUBLIC (decl))
2040 /* Cloned constructors and destructors get the same visibility as
2041 the underlying function. That should be set up in
2042 maybe_clone_body. */
2043 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2045 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2046 orig_visibility = DECL_VISIBILITY (decl);
2048 if (TREE_CODE (decl) == TYPE_DECL)
2050 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2051 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2052 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2057 else if (DECL_LANG_SPECIFIC (decl))
2058 use_template = DECL_USE_TEMPLATE (decl);
2062 /* If DECL is a member of a class, visibility specifiers on the
2063 class can influence the visibility of the DECL. */
2064 if (DECL_CLASS_SCOPE_P (decl))
2065 class_type = DECL_CONTEXT (decl);
2068 /* Not a class member. */
2070 /* Virtual tables have DECL_CONTEXT set to their associated class,
2071 so they are automatically handled above. */
2072 gcc_assert (TREE_CODE (decl) != VAR_DECL
2073 || !DECL_VTABLE_OR_VTT_P (decl));
2075 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2077 /* Local statics and classes get the visibility of their
2078 containing function by default, except that
2079 -fvisibility-inlines-hidden doesn't affect them. */
2080 tree fn = DECL_CONTEXT (decl);
2081 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2083 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2084 DECL_VISIBILITY_SPECIFIED (decl) =
2085 DECL_VISIBILITY_SPECIFIED (fn);
2088 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2090 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2091 but have no TEMPLATE_INFO, so don't try to check it. */
2094 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2095 && flag_visibility_ms_compat)
2097 /* Under -fvisibility-ms-compat, types are visible by default,
2098 even though their contents aren't. */
2099 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2100 int underlying_vis = type_visibility (underlying_type);
2101 if (underlying_vis == VISIBILITY_ANON
2102 || (CLASS_TYPE_P (underlying_type)
2103 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type)))
2104 constrain_visibility (decl, underlying_vis);
2106 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2108 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2110 /* tinfo visibility is based on the type it's for. */
2111 constrain_visibility
2112 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2114 /* Give the target a chance to override the visibility associated
2116 if (TREE_PUBLIC (decl)
2117 && !DECL_REALLY_EXTERN (decl)
2118 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2119 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2120 targetm.cxx.determine_class_data_visibility (decl);
2122 else if (use_template)
2123 /* Template instantiations and specializations get visibility based
2124 on their template unless they override it with an attribute. */;
2125 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2127 /* Set default visibility to whatever the user supplied with
2128 #pragma GCC visibility or a namespace visibility attribute. */
2129 DECL_VISIBILITY (decl) = default_visibility;
2130 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2136 /* If the specialization doesn't specify visibility, use the
2137 visibility from the template. */
2138 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2139 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2140 : DECL_TEMPLATE_INFO (decl));
2141 tree args = TI_ARGS (tinfo);
2143 if (args != error_mark_node)
2145 int depth = TMPL_ARGS_DEPTH (args);
2146 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2148 if (!DECL_VISIBILITY_SPECIFIED (decl))
2150 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2151 DECL_VISIBILITY_SPECIFIED (decl)
2152 = DECL_VISIBILITY_SPECIFIED (pattern);
2155 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2156 if (args && depth > template_class_depth (class_type))
2157 /* Limit visibility based on its template arguments. */
2158 constrain_visibility_for_template (decl, args);
2163 determine_visibility_from_class (decl, class_type);
2165 if (decl_anon_ns_mem_p (decl))
2166 /* Names in an anonymous namespace get internal linkage.
2167 This might change once we implement export. */
2168 constrain_visibility (decl, VISIBILITY_ANON);
2169 else if (TREE_CODE (decl) != TYPE_DECL)
2171 /* Propagate anonymity from type to decl. */
2172 int tvis = type_visibility (TREE_TYPE (decl));
2173 if (tvis == VISIBILITY_ANON
2174 || ! DECL_VISIBILITY_SPECIFIED (decl))
2175 constrain_visibility (decl, tvis);
2177 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2178 /* DR 757: A type without linkage shall not be used as the type of a
2179 variable or function with linkage, unless
2180 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2181 o the variable or function is not used (3.2 [basic.def.odr]) or is
2182 defined in the same translation unit.
2184 Since non-extern "C" decls need to be defined in the same
2185 translation unit, we can make the type internal. */
2186 constrain_visibility (decl, VISIBILITY_ANON);
2188 /* If visibility changed and DECL already has DECL_RTL, ensure
2189 symbol flags are updated. */
2190 if ((DECL_VISIBILITY (decl) != orig_visibility
2191 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2192 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2193 || TREE_CODE (decl) == FUNCTION_DECL)
2194 && DECL_RTL_SET_P (decl))
2195 make_decl_rtl (decl);
2198 /* By default, static data members and function members receive
2199 the visibility of their containing class. */
2202 determine_visibility_from_class (tree decl, tree class_type)
2204 if (DECL_VISIBILITY_SPECIFIED (decl))
2207 if (visibility_options.inlines_hidden
2208 /* Don't do this for inline templates; specializations might not be
2209 inline, and we don't want them to inherit the hidden
2210 visibility. We'll set it here for all inline instantiations. */
2211 && !processing_template_decl
2212 && TREE_CODE (decl) == FUNCTION_DECL
2213 && DECL_DECLARED_INLINE_P (decl)
2214 && (! DECL_LANG_SPECIFIC (decl)
2215 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2216 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2219 /* Default to the class visibility. */
2220 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2221 DECL_VISIBILITY_SPECIFIED (decl)
2222 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2225 /* Give the target a chance to override the visibility associated
2227 if (TREE_CODE (decl) == VAR_DECL
2228 && (DECL_TINFO_P (decl)
2229 || (DECL_VTABLE_OR_VTT_P (decl)
2230 /* Construction virtual tables are not exported because
2231 they cannot be referred to from other object files;
2232 their name is not standardized by the ABI. */
2233 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2234 && TREE_PUBLIC (decl)
2235 && !DECL_REALLY_EXTERN (decl)
2236 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2237 targetm.cxx.determine_class_data_visibility (decl);
2240 /* Constrain the visibility of a class TYPE based on the visibility of its
2241 field types. Warn if any fields require lesser visibility. */
2244 constrain_class_visibility (tree type)
2250 int vis = type_visibility (type);
2252 if (vis == VISIBILITY_ANON
2253 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2256 /* Don't warn about visibility if the class has explicit visibility. */
2257 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2258 vis = VISIBILITY_INTERNAL;
2260 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
2261 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2263 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2264 int subvis = type_visibility (ftype);
2266 if (subvis == VISIBILITY_ANON)
2268 if (!in_main_input_context ())
2270 %qT has a field %qD whose type uses the anonymous namespace",
2273 else if (MAYBE_CLASS_TYPE_P (ftype)
2274 && vis < VISIBILITY_HIDDEN
2275 && subvis >= VISIBILITY_HIDDEN)
2276 warning (OPT_Wattributes, "\
2277 %qT declared with greater visibility than the type of its field %qD",
2281 binfo = TYPE_BINFO (type);
2282 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2284 int subvis = type_visibility (TREE_TYPE (t));
2286 if (subvis == VISIBILITY_ANON)
2288 if (!in_main_input_context())
2290 %qT has a base %qT whose type uses the anonymous namespace",
2291 type, TREE_TYPE (t));
2293 else if (vis < VISIBILITY_HIDDEN
2294 && subvis >= VISIBILITY_HIDDEN)
2295 warning (OPT_Wattributes, "\
2296 %qT declared with greater visibility than its base %qT",
2297 type, TREE_TYPE (t));
2301 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2302 for DECL has not already been determined, do so now by setting
2303 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2304 function is called entities with vague linkage whose definitions
2305 are available must have TREE_PUBLIC set.
2307 If this function decides to place DECL in COMDAT, it will set
2308 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2309 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2310 callers defer that decision until it is clear that DECL is actually
2314 import_export_decl (tree decl)
2319 tree class_type = NULL_TREE;
2321 if (DECL_INTERFACE_KNOWN (decl))
2324 /* We cannot determine what linkage to give to an entity with vague
2325 linkage until the end of the file. For example, a virtual table
2326 for a class will be defined if and only if the key method is
2327 defined in this translation unit. As a further example, consider
2328 that when compiling a translation unit that uses PCH file with
2329 "-frepo" it would be incorrect to make decisions about what
2330 entities to emit when building the PCH; those decisions must be
2331 delayed until the repository information has been processed. */
2332 gcc_assert (at_eof);
2333 /* Object file linkage for explicit instantiations is handled in
2334 mark_decl_instantiated. For static variables in functions with
2335 vague linkage, maybe_commonize_var is used.
2337 Therefore, the only declarations that should be provided to this
2338 function are those with external linkage that are:
2340 * implicit instantiations of function templates
2344 * implicit instantiations of static data members of class
2351 Furthermore, all entities that reach this point must have a
2352 definition available in this translation unit.
2354 The following assertions check these conditions. */
2355 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2356 || TREE_CODE (decl) == VAR_DECL);
2357 /* Any code that creates entities with TREE_PUBLIC cleared should
2358 also set DECL_INTERFACE_KNOWN. */
2359 gcc_assert (TREE_PUBLIC (decl));
2360 if (TREE_CODE (decl) == FUNCTION_DECL)
2361 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2362 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2363 || DECL_DECLARED_INLINE_P (decl));
2365 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2366 || DECL_VTABLE_OR_VTT_P (decl)
2367 || DECL_TINFO_P (decl));
2368 /* Check that a definition of DECL is available in this translation
2370 gcc_assert (!DECL_REALLY_EXTERN (decl));
2372 /* Assume that DECL will not have COMDAT linkage. */
2374 /* Assume that DECL will not be imported into this translation
2378 /* See if the repository tells us whether or not to emit DECL in
2379 this translation unit. */
2380 emit_p = repo_emit_p (decl);
2383 else if (emit_p == 1)
2385 /* The repository indicates that this entity should be defined
2386 here. Make sure the back end honors that request. */
2387 if (TREE_CODE (decl) == VAR_DECL)
2389 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2390 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2393 FOR_EACH_CLONE (clone, decl)
2394 mark_needed (clone);
2398 /* Output the definition as an ordinary strong definition. */
2399 DECL_EXTERNAL (decl) = 0;
2400 DECL_INTERFACE_KNOWN (decl) = 1;
2405 /* We have already decided what to do with this DECL; there is no
2406 need to check anything further. */
2408 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2410 class_type = DECL_CONTEXT (decl);
2411 import_export_class (class_type);
2412 if (TYPE_FOR_JAVA (class_type))
2414 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2415 && CLASSTYPE_INTERFACE_ONLY (class_type))
2417 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2418 && !CLASSTYPE_USE_TEMPLATE (class_type)
2419 && CLASSTYPE_KEY_METHOD (class_type)
2420 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2421 /* The ABI requires that all virtual tables be emitted with
2422 COMDAT linkage. However, on systems where COMDAT symbols
2423 don't show up in the table of contents for a static
2424 archive, or on systems without weak symbols (where we
2425 approximate COMDAT linkage by using internal linkage), the
2426 linker will report errors about undefined symbols because
2427 it will not see the virtual table definition. Therefore,
2428 in the case that we know that the virtual table will be
2429 emitted in only one translation unit, we make the virtual
2430 table an ordinary definition with external linkage. */
2431 DECL_EXTERNAL (decl) = 0;
2432 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2434 /* CLASS_TYPE is being exported from this translation unit,
2435 so DECL should be defined here. */
2436 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2437 /* If a class is declared in a header with the "extern
2438 template" extension, then it will not be instantiated,
2439 even in translation units that would normally require
2440 it. Often such classes are explicitly instantiated in
2441 one translation unit. Therefore, the explicit
2442 instantiation must be made visible to other translation
2444 DECL_EXTERNAL (decl) = 0;
2447 /* The generic C++ ABI says that class data is always
2448 COMDAT, even if there is a key function. Some
2449 variants (e.g., the ARM EABI) says that class data
2450 only has COMDAT linkage if the class data might be
2451 emitted in more than one translation unit. When the
2452 key method can be inline and is inline, we still have
2453 to arrange for comdat even though
2454 class_data_always_comdat is false. */
2455 if (!CLASSTYPE_KEY_METHOD (class_type)
2456 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2457 || targetm.cxx.class_data_always_comdat ())
2459 /* The ABI requires COMDAT linkage. Normally, we
2460 only emit COMDAT things when they are needed;
2461 make sure that we realize that this entity is
2468 else if (!flag_implicit_templates
2469 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2474 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2476 tree type = TREE_TYPE (DECL_NAME (decl));
2477 if (CLASS_TYPE_P (type))
2480 import_export_class (type);
2481 if (CLASSTYPE_INTERFACE_KNOWN (type)
2482 && TYPE_POLYMORPHIC_P (type)
2483 && CLASSTYPE_INTERFACE_ONLY (type)
2484 /* If -fno-rtti was specified, then we cannot be sure
2485 that RTTI information will be emitted with the
2486 virtual table of the class, so we must emit it
2487 wherever it is used. */
2492 if (CLASSTYPE_INTERFACE_KNOWN (type)
2493 && !CLASSTYPE_INTERFACE_ONLY (type))
2495 comdat_p = (targetm.cxx.class_data_always_comdat ()
2496 || (CLASSTYPE_KEY_METHOD (type)
2497 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2502 DECL_EXTERNAL (decl) = 0;
2512 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2513 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2515 /* DECL is an implicit instantiation of a function or static
2517 if ((flag_implicit_templates
2518 && !flag_use_repository)
2519 || (flag_implicit_inline_templates
2520 && TREE_CODE (decl) == FUNCTION_DECL
2521 && DECL_DECLARED_INLINE_P (decl)))
2524 /* If we are not implicitly generating templates, then mark
2525 this entity as undefined in this translation unit. */
2528 else if (DECL_FUNCTION_MEMBER_P (decl))
2530 if (!DECL_DECLARED_INLINE_P (decl))
2532 tree ctype = DECL_CONTEXT (decl);
2533 import_export_class (ctype);
2534 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2536 DECL_NOT_REALLY_EXTERN (decl)
2537 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2538 || (DECL_DECLARED_INLINE_P (decl)
2539 && ! flag_implement_inlines
2540 && !DECL_VINDEX (decl)));
2542 if (!DECL_NOT_REALLY_EXTERN (decl))
2543 DECL_EXTERNAL (decl) = 1;
2545 /* Always make artificials weak. */
2546 if (DECL_ARTIFICIAL (decl) && flag_weak)
2549 maybe_make_one_only (decl);
2560 /* If we are importing DECL into this translation unit, mark is
2561 an undefined here. */
2562 DECL_EXTERNAL (decl) = 1;
2563 DECL_NOT_REALLY_EXTERN (decl) = 0;
2567 /* If we decided to put DECL in COMDAT, mark it accordingly at
2569 comdat_linkage (decl);
2572 DECL_INTERFACE_KNOWN (decl) = 1;
2575 /* Return an expression that performs the destruction of DECL, which
2576 must be a VAR_DECL whose type has a non-trivial destructor, or is
2577 an array whose (innermost) elements have a non-trivial destructor. */
2580 build_cleanup (tree decl)
2583 tree type = TREE_TYPE (decl);
2585 /* This function should only be called for declarations that really
2586 require cleanups. */
2587 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2589 /* Treat all objects with destructors as used; the destructor may do
2590 something substantive. */
2593 if (TREE_CODE (type) == ARRAY_TYPE)
2596 temp = build_address (decl);
2597 temp = build_delete (TREE_TYPE (temp), temp,
2598 sfk_complete_destructor,
2599 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0,
2600 tf_warning_or_error);
2604 /* Returns the initialization guard variable for the variable DECL,
2605 which has static storage duration. */
2608 get_guard (tree decl)
2613 sname = mangle_guard_variable (decl);
2614 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2619 /* We use a type that is big enough to contain a mutex as well
2620 as an integer counter. */
2621 guard_type = targetm.cxx.guard_type ();
2622 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2623 VAR_DECL, sname, guard_type);
2625 /* The guard should have the same linkage as what it guards. */
2626 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2627 TREE_STATIC (guard) = TREE_STATIC (decl);
2628 DECL_COMMON (guard) = DECL_COMMON (decl);
2629 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2630 if (DECL_ONE_ONLY (decl))
2631 make_decl_one_only (guard, cxx_comdat_group (guard));
2632 if (TREE_PUBLIC (decl))
2633 DECL_WEAK (guard) = DECL_WEAK (decl);
2634 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2635 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2637 DECL_ARTIFICIAL (guard) = 1;
2638 DECL_IGNORED_P (guard) = 1;
2639 TREE_USED (guard) = 1;
2640 pushdecl_top_level_and_finish (guard, NULL_TREE);
2645 /* Return those bits of the GUARD variable that should be set when the
2646 guarded entity is actually initialized. */
2649 get_guard_bits (tree guard)
2651 if (!targetm.cxx.guard_mask_bit ())
2653 /* We only set the first byte of the guard, in order to leave room
2654 for a mutex in the high-order bits. */
2655 guard = build1 (ADDR_EXPR,
2656 build_pointer_type (TREE_TYPE (guard)),
2658 guard = build1 (NOP_EXPR,
2659 build_pointer_type (char_type_node),
2661 guard = build1 (INDIRECT_REF, char_type_node, guard);
2667 /* Return an expression which determines whether or not the GUARD
2668 variable has already been initialized. */
2671 get_guard_cond (tree guard)
2675 /* Check to see if the GUARD is zero. */
2676 guard = get_guard_bits (guard);
2678 /* Mask off all but the low bit. */
2679 if (targetm.cxx.guard_mask_bit ())
2681 guard_value = integer_one_node;
2682 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2683 guard_value = convert (TREE_TYPE (guard), guard_value);
2684 guard = cp_build_binary_op (input_location,
2685 BIT_AND_EXPR, guard, guard_value,
2686 tf_warning_or_error);
2689 guard_value = integer_zero_node;
2690 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2691 guard_value = convert (TREE_TYPE (guard), guard_value);
2692 return cp_build_binary_op (input_location,
2693 EQ_EXPR, guard, guard_value,
2694 tf_warning_or_error);
2697 /* Return an expression which sets the GUARD variable, indicating that
2698 the variable being guarded has been initialized. */
2701 set_guard (tree guard)
2705 /* Set the GUARD to one. */
2706 guard = get_guard_bits (guard);
2707 guard_init = integer_one_node;
2708 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2709 guard_init = convert (TREE_TYPE (guard), guard_init);
2710 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2711 tf_warning_or_error);
2714 /* Start the process of running a particular set of global constructors
2715 or destructors. Subroutine of do_[cd]tors. */
2718 start_objects (int method_type, int initp)
2724 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2726 if (initp != DEFAULT_INIT_PRIORITY)
2736 sprintf (type, "sub_%c%c%.5u", method_type, joiner, initp);
2739 sprintf (type, "sub_%c", method_type);
2741 fndecl = build_lang_decl (FUNCTION_DECL,
2742 get_file_function_name (type),
2743 build_function_type_list (void_type_node,
2745 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2747 TREE_PUBLIC (current_function_decl) = 0;
2749 /* Mark as artificial because it's not explicitly in the user's
2751 DECL_ARTIFICIAL (current_function_decl) = 1;
2753 /* Mark this declaration as used to avoid spurious warnings. */
2754 TREE_USED (current_function_decl) = 1;
2756 /* Mark this function as a global constructor or destructor. */
2757 if (method_type == 'I')
2758 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2760 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2762 body = begin_compound_stmt (BCS_FN_BODY);
2767 /* Finish the process of running a particular set of global constructors
2768 or destructors. Subroutine of do_[cd]tors. */
2771 finish_objects (int method_type, int initp, tree body)
2776 finish_compound_stmt (body);
2777 fn = finish_function (0);
2779 if (method_type == 'I')
2781 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2782 decl_init_priority_insert (fn, initp);
2786 DECL_STATIC_DESTRUCTOR (fn) = 1;
2787 decl_fini_priority_insert (fn, initp);
2790 expand_or_defer_fn (fn);
2793 /* The names of the parameters to the function created to handle
2794 initializations and destructions for objects with static storage
2796 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2797 #define PRIORITY_IDENTIFIER "__priority"
2799 /* The name of the function we create to handle initializations and
2800 destructions for objects with static storage duration. */
2801 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2803 /* The declaration for the __INITIALIZE_P argument. */
2804 static GTY(()) tree initialize_p_decl;
2806 /* The declaration for the __PRIORITY argument. */
2807 static GTY(()) tree priority_decl;
2809 /* The declaration for the static storage duration function. */
2810 static GTY(()) tree ssdf_decl;
2812 /* All the static storage duration functions created in this
2813 translation unit. */
2814 static GTY(()) VEC(tree,gc) *ssdf_decls;
2816 /* A map from priority levels to information about that priority
2817 level. There may be many such levels, so efficient lookup is
2819 static splay_tree priority_info_map;
2821 /* Begins the generation of the function that will handle all
2822 initialization and destruction of objects with static storage
2823 duration. The function generated takes two parameters of type
2824 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2825 nonzero, it performs initializations. Otherwise, it performs
2826 destructions. It only performs those initializations or
2827 destructions with the indicated __PRIORITY. The generated function
2830 It is assumed that this function will only be called once per
2831 translation unit. */
2834 start_static_storage_duration_function (unsigned count)
2838 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2840 /* Create the identifier for this function. It will be of the form
2841 SSDF_IDENTIFIER_<number>. */
2842 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2844 type = build_function_type_list (void_type_node,
2845 integer_type_node, integer_type_node,
2848 /* Create the FUNCTION_DECL itself. */
2849 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2850 get_identifier (id),
2852 TREE_PUBLIC (ssdf_decl) = 0;
2853 DECL_ARTIFICIAL (ssdf_decl) = 1;
2855 /* Put this function in the list of functions to be called from the
2856 static constructors and destructors. */
2859 ssdf_decls = VEC_alloc (tree, gc, 32);
2861 /* Take this opportunity to initialize the map from priority
2862 numbers to information about that priority level. */
2863 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2864 /*delete_key_fn=*/0,
2865 /*delete_value_fn=*/
2866 (splay_tree_delete_value_fn) &free);
2868 /* We always need to generate functions for the
2869 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2870 priorities later, we'll be sure to find the
2871 DEFAULT_INIT_PRIORITY. */
2872 get_priority_info (DEFAULT_INIT_PRIORITY);
2875 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2877 /* Create the argument list. */
2878 initialize_p_decl = cp_build_parm_decl
2879 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2880 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2881 TREE_USED (initialize_p_decl) = 1;
2882 priority_decl = cp_build_parm_decl
2883 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2884 DECL_CONTEXT (priority_decl) = ssdf_decl;
2885 TREE_USED (priority_decl) = 1;
2887 DECL_CHAIN (initialize_p_decl) = priority_decl;
2888 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2890 /* Put the function in the global scope. */
2891 pushdecl (ssdf_decl);
2893 /* Start the function itself. This is equivalent to declaring the
2896 static void __ssdf (int __initialize_p, init __priority_p);
2898 It is static because we only need to call this function from the
2899 various constructor and destructor functions for this module. */
2900 start_preparsed_function (ssdf_decl,
2901 /*attrs=*/NULL_TREE,
2904 /* Set up the scope of the outermost block in the function. */
2905 body = begin_compound_stmt (BCS_FN_BODY);
2910 /* Finish the generation of the function which performs initialization
2911 and destruction of objects with static storage duration. After
2912 this point, no more such objects can be created. */
2915 finish_static_storage_duration_function (tree body)
2917 /* Close out the function. */
2918 finish_compound_stmt (body);
2919 expand_or_defer_fn (finish_function (0));
2922 /* Return the information about the indicated PRIORITY level. If no
2923 code to handle this level has yet been generated, generate the
2924 appropriate prologue. */
2926 static priority_info
2927 get_priority_info (int priority)
2932 n = splay_tree_lookup (priority_info_map,
2933 (splay_tree_key) priority);
2936 /* Create a new priority information structure, and insert it
2938 pi = XNEW (struct priority_info_s);
2939 pi->initializations_p = 0;
2940 pi->destructions_p = 0;
2941 splay_tree_insert (priority_info_map,
2942 (splay_tree_key) priority,
2943 (splay_tree_value) pi);
2946 pi = (priority_info) n->value;
2951 /* The effective initialization priority of a DECL. */
2953 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2954 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2955 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2957 /* Whether a DECL needs a guard to protect it against multiple
2960 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2961 || DECL_ONE_ONLY (decl) \
2962 || DECL_WEAK (decl)))
2964 /* Called from one_static_initialization_or_destruction(),
2966 Walks the initializer list of a global variable and looks for
2967 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2968 and that have their DECL_CONTEXT() == NULL.
2969 For each such temporary variable, set their DECL_CONTEXT() to
2970 the current function. This is necessary because otherwise
2971 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2972 when trying to refer to a temporary variable that does not have
2973 it's DECL_CONTECT() properly set. */
2975 fix_temporary_vars_context_r (tree *node,
2976 int *unused ATTRIBUTE_UNUSED,
2977 void *unused1 ATTRIBUTE_UNUSED)
2979 gcc_assert (current_function_decl);
2981 if (TREE_CODE (*node) == BIND_EXPR)
2985 for (var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var))
2986 if (TREE_CODE (var) == VAR_DECL
2988 && DECL_ARTIFICIAL (var)
2989 && !DECL_CONTEXT (var))
2990 DECL_CONTEXT (var) = current_function_decl;
2996 /* Set up to handle the initialization or destruction of DECL. If
2997 INITP is nonzero, we are initializing the variable. Otherwise, we
2998 are destroying it. */
3001 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
3003 tree guard_if_stmt = NULL_TREE;
3006 /* If we are supposed to destruct and there's a trivial destructor,
3007 nothing has to be done. */
3009 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3012 /* Trick the compiler into thinking we are at the file and line
3013 where DECL was declared so that error-messages make sense, and so
3014 that the debugger will show somewhat sensible file and line
3016 input_location = DECL_SOURCE_LOCATION (decl);
3018 /* Make sure temporary variables in the initialiser all have
3019 their DECL_CONTEXT() set to a value different from NULL_TREE.
3020 This can happen when global variables initialisers are built.
3021 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3022 the temporary variables that might have been generated in the
3023 accompagning initialisers is NULL_TREE, meaning the variables have been
3024 declared in the global namespace.
3025 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3026 of the temporaries are set to the current function decl. */
3027 cp_walk_tree_without_duplicates (&init,
3028 fix_temporary_vars_context_r,
3035 Access control for implicit calls to the constructors,
3036 the conversion functions, or the destructor called to
3037 create and destroy a static data member is performed as
3038 if these calls appeared in the scope of the member's
3041 we pretend we are in a static member function of the class of
3042 which the DECL is a member. */
3043 if (member_p (decl))
3045 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3046 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3049 /* Assume we don't need a guard. */
3051 /* We need a guard if this is an object with external linkage that
3052 might be initialized in more than one place. (For example, a
3053 static data member of a template, when the data member requires
3055 if (NEEDS_GUARD_P (decl))
3059 guard = get_guard (decl);
3061 /* When using __cxa_atexit, we just check the GUARD as we would
3062 for a local static. */
3063 if (flag_use_cxa_atexit)
3065 /* When using __cxa_atexit, we never try to destroy
3066 anything from a static destructor. */
3068 guard_cond = get_guard_cond (guard);
3070 /* If we don't have __cxa_atexit, then we will be running
3071 destructors from .fini sections, or their equivalents. So,
3072 we need to know how many times we've tried to initialize this
3073 object. We do initializations only if the GUARD is zero,
3074 i.e., if we are the first to initialize the variable. We do
3075 destructions only if the GUARD is one, i.e., if we are the
3076 last to destroy the variable. */
3079 = cp_build_binary_op (input_location,
3081 cp_build_unary_op (PREINCREMENT_EXPR,
3084 tf_warning_or_error),
3086 tf_warning_or_error);
3089 = cp_build_binary_op (input_location,
3091 cp_build_unary_op (PREDECREMENT_EXPR,
3094 tf_warning_or_error),
3096 tf_warning_or_error);
3098 guard_if_stmt = begin_if_stmt ();
3099 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3103 /* If we're using __cxa_atexit, we have not already set the GUARD,
3104 so we must do so now. */
3105 if (guard && initp && flag_use_cxa_atexit)
3106 finish_expr_stmt (set_guard (guard));
3108 /* Perform the initialization or destruction. */
3112 finish_expr_stmt (init);
3114 /* If we're using __cxa_atexit, register a function that calls the
3115 destructor for the object. */
3116 if (flag_use_cxa_atexit)
3117 finish_expr_stmt (register_dtor_fn (decl));
3120 finish_expr_stmt (build_cleanup (decl));
3122 /* Finish the guard if-stmt, if necessary. */
3125 finish_then_clause (guard_if_stmt);
3126 finish_if_stmt (guard_if_stmt);
3129 /* Now that we're done with DECL we don't need to pretend to be a
3130 member of its class any longer. */
3131 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3132 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3135 /* Generate code to do the initialization or destruction of the decls in VARS,
3136 a TREE_LIST of VAR_DECL with static storage duration.
3137 Whether initialization or destruction is performed is specified by INITP. */
3140 do_static_initialization_or_destruction (tree vars, bool initp)
3142 tree node, init_if_stmt, cond;
3144 /* Build the outer if-stmt to check for initialization or destruction. */
3145 init_if_stmt = begin_if_stmt ();
3146 cond = initp ? integer_one_node : integer_zero_node;
3147 cond = cp_build_binary_op (input_location,
3151 tf_warning_or_error);
3152 finish_if_stmt_cond (cond, init_if_stmt);
3156 tree decl = TREE_VALUE (node);
3157 tree priority_if_stmt;
3161 /* If we don't need a destructor, there's nothing to do. Avoid
3162 creating a possibly empty if-stmt. */
3163 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3165 node = TREE_CHAIN (node);
3169 /* Remember that we had an initialization or finalization at this
3171 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3172 pi = get_priority_info (priority);
3174 pi->initializations_p = 1;
3176 pi->destructions_p = 1;
3178 /* Conditionalize this initialization on being in the right priority
3179 and being initializing/finalizing appropriately. */
3180 priority_if_stmt = begin_if_stmt ();
3181 cond = cp_build_binary_op (input_location,
3184 build_int_cst (NULL_TREE, priority),
3185 tf_warning_or_error);
3186 finish_if_stmt_cond (cond, priority_if_stmt);
3188 /* Process initializers with same priority. */
3190 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3191 node = TREE_CHAIN (node))
3192 /* Do one initialization or destruction. */
3193 one_static_initialization_or_destruction (TREE_VALUE (node),
3194 TREE_PURPOSE (node), initp);
3196 /* Finish up the priority if-stmt body. */
3197 finish_then_clause (priority_if_stmt);
3198 finish_if_stmt (priority_if_stmt);
3202 /* Finish up the init/destruct if-stmt body. */
3203 finish_then_clause (init_if_stmt);
3204 finish_if_stmt (init_if_stmt);
3207 /* VARS is a list of variables with static storage duration which may
3208 need initialization and/or finalization. Remove those variables
3209 that don't really need to be initialized or finalized, and return
3210 the resulting list. The order in which the variables appear in
3211 VARS is in reverse order of the order in which they should actually
3212 be initialized. The list we return is in the unreversed order;
3213 i.e., the first variable should be initialized first. */
3216 prune_vars_needing_no_initialization (tree *vars)
3219 tree result = NULL_TREE;
3224 tree decl = TREE_VALUE (t);
3225 tree init = TREE_PURPOSE (t);
3227 /* Deal gracefully with error. */
3228 if (decl == error_mark_node)
3230 var = &TREE_CHAIN (t);
3234 /* The only things that can be initialized are variables. */
3235 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3237 /* If this object is not defined, we don't need to do anything
3239 if (DECL_EXTERNAL (decl))
3241 var = &TREE_CHAIN (t);
3245 /* Also, if the initializer already contains errors, we can bail
3247 if (init && TREE_CODE (init) == TREE_LIST
3248 && value_member (error_mark_node, init))
3250 var = &TREE_CHAIN (t);
3254 /* This variable is going to need initialization and/or
3255 finalization, so we add it to the list. */
3256 *var = TREE_CHAIN (t);
3257 TREE_CHAIN (t) = result;
3264 /* Make sure we have told the back end about all the variables in
3268 write_out_vars (tree vars)
3272 for (v = vars; v; v = TREE_CHAIN (v))
3274 tree var = TREE_VALUE (v);
3275 if (!var_finalized_p (var))
3277 import_export_decl (var);
3278 rest_of_decl_compilation (var, 1, 1);
3283 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3284 (otherwise) that will initialize all global objects with static
3285 storage duration having the indicated PRIORITY. */
3288 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3296 input_location = *locus;
3298 /* Was: locus->line++; */
3300 /* We use `I' to indicate initialization and `D' to indicate
3302 function_key = constructor_p ? 'I' : 'D';
3304 /* We emit the function lazily, to avoid generating empty
3305 global constructors and destructors. */
3308 /* For Objective-C++, we may need to initialize metadata found in this module.
3309 This must be done _before_ any other static initializations. */
3310 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3311 && constructor_p && objc_static_init_needed_p ())
3313 body = start_objects (function_key, priority);
3314 objc_generate_static_init_call (NULL_TREE);
3317 /* Call the static storage duration function with appropriate
3319 FOR_EACH_VEC_ELT (tree, ssdf_decls, i, fndecl)
3321 /* Calls to pure or const functions will expand to nothing. */
3322 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3327 body = start_objects (function_key, priority);
3329 call = cp_build_function_call_nary (fndecl, tf_warning_or_error,
3330 build_int_cst (NULL_TREE,
3332 build_int_cst (NULL_TREE,
3335 finish_expr_stmt (call);
3339 /* Close out the function. */
3341 finish_objects (function_key, priority, body);
3344 /* Generate constructor and destructor functions for the priority
3348 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3350 location_t *locus = (location_t *) data;
3351 int priority = (int) n->key;
3352 priority_info pi = (priority_info) n->value;
3354 /* Generate the functions themselves, but only if they are really
3356 if (pi->initializations_p)
3357 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3358 if (pi->destructions_p)
3359 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3361 /* Keep iterating. */
3365 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3366 decls referenced from front-end specific constructs; it will be called
3367 only for language-specific tree nodes.
3369 Here we must deal with member pointers. */
3372 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3376 switch (TREE_CODE (t))
3379 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3380 cgraph_mark_address_taken_node (
3381 cgraph_get_create_node (PTRMEM_CST_MEMBER (t)));
3384 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3385 cgraph_mark_address_taken_node (
3386 cgraph_get_create_node (BASELINK_FUNCTIONS (t)));
3389 if (DECL_CONTEXT (t)
3390 && flag_use_repository
3391 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3392 /* If we need a static variable in a function, then we
3393 need the containing function. */
3394 mark_decl_referenced (DECL_CONTEXT (t));
3403 /* Java requires that we be able to reference a local address for a
3404 method, and not be confused by PLT entries. If hidden aliases are
3405 supported, collect and return all the functions for which we should
3406 emit a hidden alias. */
3408 static struct pointer_set_t *
3409 collect_candidates_for_java_method_aliases (void)
3411 struct cgraph_node *node;
3412 struct pointer_set_t *candidates = NULL;
3414 #ifndef HAVE_GAS_HIDDEN
3418 for (node = cgraph_nodes; node ; node = node->next)
3420 tree fndecl = node->decl;
3422 if (DECL_CONTEXT (fndecl)
3423 && TYPE_P (DECL_CONTEXT (fndecl))
3424 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3425 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3427 if (candidates == NULL)
3428 candidates = pointer_set_create ();
3429 pointer_set_insert (candidates, fndecl);
3437 /* Java requires that we be able to reference a local address for a
3438 method, and not be confused by PLT entries. If hidden aliases are
3439 supported, emit one for each java function that we've emitted.
3440 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3441 by collect_candidates_for_java_method_aliases. */
3444 build_java_method_aliases (struct pointer_set_t *candidates)
3446 struct cgraph_node *node;
3448 #ifndef HAVE_GAS_HIDDEN
3452 for (node = cgraph_nodes; node ; node = node->next)
3454 tree fndecl = node->decl;
3456 if (TREE_ASM_WRITTEN (fndecl)
3457 && pointer_set_contains (candidates, fndecl))
3459 /* Mangle the name in a predictable way; we need to reference
3460 this from a java compiled object file. */
3461 tree oid, nid, alias;
3465 oid = DECL_ASSEMBLER_NAME (fndecl);
3466 oname = IDENTIFIER_POINTER (oid);
3467 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3468 nname = ACONCAT (("_ZGA", oname+2, NULL));
3469 nid = get_identifier (nname);
3471 alias = make_alias_for (fndecl, nid);
3472 TREE_PUBLIC (alias) = 1;
3473 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3475 assemble_alias (alias, oid);
3480 /* Return C++ property of T, based on given operation OP. */
3483 cpp_check (tree t, cpp_operation op)
3488 return DECL_PURE_VIRTUAL_P (t);
3489 case IS_CONSTRUCTOR:
3490 return DECL_CONSTRUCTOR_P (t);
3492 return DECL_DESTRUCTOR_P (t);
3493 case IS_COPY_CONSTRUCTOR:
3494 return DECL_COPY_CONSTRUCTOR_P (t);
3496 return TREE_CODE (t) == TEMPLATE_DECL;
3502 /* Collect source file references recursively, starting from NAMESPC. */
3505 collect_source_refs (tree namespc)
3512 /* Iterate over names in this name space. */
3513 for (t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
3514 if (!DECL_IS_BUILTIN (t) )
3515 collect_source_ref (DECL_SOURCE_FILE (t));
3517 /* Dump siblings, if any */
3518 collect_source_refs (TREE_CHAIN (namespc));
3520 /* Dump children, if any */
3521 collect_source_refs (NAMESPACE_LEVEL (namespc)->namespaces);
3524 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
3525 starting from NAMESPC. */
3528 collect_ada_namespace (tree namespc, const char *source_file)
3533 /* Collect decls from this namespace */
3534 collect_ada_nodes (NAMESPACE_LEVEL (namespc)->names, source_file);
3536 /* Collect siblings, if any */
3537 collect_ada_namespace (TREE_CHAIN (namespc), source_file);
3539 /* Collect children, if any */
3540 collect_ada_namespace (NAMESPACE_LEVEL (namespc)->namespaces, source_file);
3543 /* Returns true iff there is a definition available for variable or
3547 decl_defined_p (tree decl)
3549 if (TREE_CODE (decl) == FUNCTION_DECL)
3550 return (DECL_INITIAL (decl) != NULL_TREE);
3553 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3554 return !DECL_EXTERNAL (decl);
3558 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
3562 An integral constant-expression can only involve ... const
3563 variables of integral or enumeration types initialized with
3564 constant expressions ...
3566 C++0x also allows constexpr variables and temporaries initialized
3567 with constant expressions. We handle the former here, but the latter
3568 are just folded away in cxx_eval_constant_expression.
3570 The standard does not require that the expression be non-volatile.
3571 G++ implements the proposed correction in DR 457. */
3574 decl_constant_var_p (tree decl)
3577 tree type = TREE_TYPE (decl);
3578 if (TREE_CODE (decl) != VAR_DECL)
3580 if (DECL_DECLARED_CONSTEXPR_P (decl)
3581 || (CP_TYPE_CONST_NON_VOLATILE_P (type)
3582 && INTEGRAL_OR_ENUMERATION_TYPE_P (type)))
3584 /* We don't know if a template static data member is initialized with
3585 a constant expression until we instantiate its initializer. Even
3586 in the case of a constexpr variable, we can't treat it as a
3587 constant until its initializer is complete in case it's used in
3588 its own initializer. */
3590 ret = DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl);
3598 /* Returns true if DECL could be a symbolic constant variable, depending on
3602 decl_maybe_constant_var_p (tree decl)
3604 tree type = TREE_TYPE (decl);
3605 if (TREE_CODE (decl) != VAR_DECL)
3607 if (DECL_DECLARED_CONSTEXPR_P (decl))
3609 return (CP_TYPE_CONST_NON_VOLATILE_P (type)
3610 && INTEGRAL_OR_ENUMERATION_TYPE_P (type));
3613 /* Complain that DECL uses a type with no linkage but is never defined. */
3616 no_linkage_error (tree decl)
3618 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3619 if (TYPE_ANONYMOUS_P (t))
3621 permerror (0, "%q+#D, declared using anonymous type, "
3622 "is used but never defined", decl);
3623 if (is_typedef_decl (TYPE_NAME (t)))
3624 permerror (0, "%q+#D does not refer to the unqualified type, "
3625 "so it is not used for linkage", TYPE_NAME (t));
3628 permerror (0, "%q+#D, declared using local type %qT, "
3629 "is used but never defined", decl, t);
3632 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
3635 collect_all_refs (const char *source_file)
3637 collect_ada_namespace (global_namespace, source_file);
3640 /* This routine is called at the end of compilation.
3641 Its job is to create all the code needed to initialize and
3642 destroy the global aggregates. We do the destruction
3643 first, since that way we only need to reverse the decls once. */
3646 cp_write_global_declarations (void)
3652 unsigned ssdf_count = 0;
3655 struct pointer_set_t *candidates;
3657 locus = input_location;
3660 /* Bad parse errors. Just forget about it. */
3661 if (! global_bindings_p () || current_class_type
3662 || !VEC_empty (tree,decl_namespace_list))
3666 c_common_write_pch ();
3668 /* Handle -fdump-ada-spec[-slim] */
3669 if (dump_enabled_p (TDI_ada))
3671 if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM)
3672 collect_source_ref (main_input_filename);
3674 collect_source_refs (global_namespace);
3676 dump_ada_specs (collect_all_refs, cpp_check);
3679 /* FIXME - huh? was input_line -= 1;*/
3681 /* We now have to write out all the stuff we put off writing out.
3684 o Template specializations that we have not yet instantiated,
3685 but which are needed.
3686 o Initialization and destruction for non-local objects with
3687 static storage duration. (Local objects with static storage
3688 duration are initialized when their scope is first entered,
3689 and are cleaned up via atexit.)
3690 o Virtual function tables.
3692 All of these may cause others to be needed. For example,
3693 instantiating one function may cause another to be needed, and
3694 generating the initializer for an object may cause templates to be
3695 instantiated, etc., etc. */
3697 timevar_push (TV_VARCONST);
3699 emit_support_tinfos ();
3708 /* If there are templates that we've put off instantiating, do
3710 instantiate_pending_templates (retries);
3713 /* Write out virtual tables as required. Note that writing out
3714 the virtual table for a template class may cause the
3715 instantiation of members of that class. If we write out
3716 vtables then we remove the class from our list so we don't
3717 have to look at it again. */
3719 while (keyed_classes != NULL_TREE
3720 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3723 keyed_classes = TREE_CHAIN (keyed_classes);
3729 tree next = TREE_CHAIN (t);
3733 if (maybe_emit_vtables (TREE_VALUE (next)))
3736 TREE_CHAIN (t) = TREE_CHAIN (next);
3741 next = TREE_CHAIN (t);
3745 /* Write out needed type info variables. We have to be careful
3746 looping through unemitted decls, because emit_tinfo_decl may
3747 cause other variables to be needed. New elements will be
3748 appended, and we remove from the vector those that actually
3750 for (i = VEC_length (tree, unemitted_tinfo_decls);
3751 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3752 if (emit_tinfo_decl (t))
3755 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3758 /* The list of objects with static storage duration is built up
3759 in reverse order. We clear STATIC_AGGREGATES so that any new
3760 aggregates added during the initialization of these will be
3761 initialized in the correct order when we next come around the
3763 vars = prune_vars_needing_no_initialization (&static_aggregates);
3767 /* We need to start a new initialization function each time
3768 through the loop. That's because we need to know which
3769 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3770 isn't computed until a function is finished, and written
3771 out. That's a deficiency in the back end. When this is
3772 fixed, these initialization functions could all become
3773 inline, with resulting performance improvements. */
3776 /* Set the line and file, so that it is obviously not from
3778 input_location = locus;
3779 ssdf_body = start_static_storage_duration_function (ssdf_count);
3781 /* Make sure the back end knows about all the variables. */
3782 write_out_vars (vars);
3784 /* First generate code to do all the initializations. */
3786 do_static_initialization_or_destruction (vars, /*initp=*/true);
3788 /* Then, generate code to do all the destructions. Do these
3789 in reverse order so that the most recently constructed
3790 variable is the first destroyed. If we're using
3791 __cxa_atexit, then we don't need to do this; functions
3792 were registered at initialization time to destroy the
3794 if (!flag_use_cxa_atexit && vars)
3796 vars = nreverse (vars);
3797 do_static_initialization_or_destruction (vars, /*initp=*/false);
3802 /* Finish up the static storage duration function for this
3804 input_location = locus;
3805 finish_static_storage_duration_function (ssdf_body);
3807 /* All those initializations and finalizations might cause
3808 us to need more inline functions, more template
3809 instantiations, etc. */
3812 /* ??? was: locus.line++; */
3815 /* Go through the set of inline functions whose bodies have not
3816 been emitted yet. If out-of-line copies of these functions
3817 are required, emit them. */
3818 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3820 /* Does it need synthesizing? */
3821 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3822 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3824 /* Even though we're already at the top-level, we push
3825 there again. That way, when we pop back a few lines
3826 hence, all of our state is restored. Otherwise,
3827 finish_function doesn't clean things up, and we end
3828 up with CURRENT_FUNCTION_DECL set. */
3829 push_to_top_level ();
3830 /* The decl's location will mark where it was first
3831 needed. Save that so synthesize method can indicate
3832 where it was needed from, in case of error */
3833 input_location = DECL_SOURCE_LOCATION (decl);
3834 synthesize_method (decl);
3835 pop_from_top_level ();
3839 if (!DECL_SAVED_TREE (decl))
3842 /* We lie to the back end, pretending that some functions
3843 are not defined when they really are. This keeps these
3844 functions from being put out unnecessarily. But, we must
3845 stop lying when the functions are referenced, or if they
3846 are not comdat since they need to be put out now. If
3847 DECL_INTERFACE_KNOWN, then we have already set
3848 DECL_EXTERNAL appropriately, so there's no need to check
3849 again, and we do not want to clear DECL_EXTERNAL if a
3850 previous call to import_export_decl set it.
3852 This is done in a separate for cycle, because if some
3853 deferred function is contained in another deferred
3854 function later in deferred_fns varray,
3855 rest_of_compilation would skip this function and we
3856 really cannot expand the same function twice. */
3857 import_export_decl (decl);
3858 if (DECL_NOT_REALLY_EXTERN (decl)
3859 && DECL_INITIAL (decl)
3860 && decl_needed_p (decl))
3862 struct cgraph_node *node = cgraph_get_node (decl), *alias, *next;
3864 DECL_EXTERNAL (decl) = 0;
3865 /* If we mark !DECL_EXTERNAL one of the same body aliases,
3866 we need to mark all of them that way. */
3867 if (node && node->same_body)
3869 DECL_EXTERNAL (node->decl) = 0;
3870 for (alias = node->same_body; alias; alias = alias->next)
3871 DECL_EXTERNAL (alias->decl) = 0;
3873 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3874 group, we need to mark all symbols in the same comdat group
3876 if (node->same_comdat_group)
3877 for (next = node->same_comdat_group;
3879 next = next->same_comdat_group)
3881 DECL_EXTERNAL (next->decl) = 0;
3882 if (next->same_body)
3884 for (alias = next->same_body;
3886 alias = alias->next)
3887 DECL_EXTERNAL (alias->decl) = 0;
3892 /* If we're going to need to write this function out, and
3893 there's already a body for it, create RTL for it now.
3894 (There might be no body if this is a method we haven't
3895 gotten around to synthesizing yet.) */
3896 if (!DECL_EXTERNAL (decl)
3897 && decl_needed_p (decl)
3898 && !TREE_ASM_WRITTEN (decl)
3899 && !cgraph_get_node (decl)->local.finalized)
3901 /* We will output the function; no longer consider it in this
3903 DECL_DEFER_OUTPUT (decl) = 0;
3904 /* Generate RTL for this function now that we know we
3906 expand_or_defer_fn (decl);
3907 /* If we're compiling -fsyntax-only pretend that this
3908 function has been written out so that we don't try to
3910 if (flag_syntax_only)
3911 TREE_ASM_WRITTEN (decl) = 1;
3916 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3919 /* Static data members are just like namespace-scope globals. */
3920 FOR_EACH_VEC_ELT (tree, pending_statics, i, decl)
3922 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3923 /* Don't write it out if we haven't seen a definition. */
3924 || DECL_IN_AGGR_P (decl))
3926 import_export_decl (decl);
3927 /* If this static data member is needed, provide it to the
3929 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3930 DECL_EXTERNAL (decl) = 0;
3932 if (VEC_length (tree, pending_statics) != 0
3933 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3934 VEC_length (tree, pending_statics)))
3941 /* All used inline functions must have a definition at this point. */
3942 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3944 if (/* Check online inline functions that were actually used. */
3945 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3946 /* If the definition actually was available here, then the
3947 fact that the function was not defined merely represents
3948 that for some reason (use of a template repository,
3949 #pragma interface, etc.) we decided not to emit the
3951 && !DECL_INITIAL (decl)
3952 /* An explicit instantiation can be used to specify
3953 that the body is in another unit. It will have
3954 already verified there was a definition. */
3955 && !DECL_EXPLICIT_INSTANTIATION (decl))
3957 warning (0, "inline function %q+D used but never defined", decl);
3958 /* Avoid a duplicate warning from check_global_declaration_1. */
3959 TREE_NO_WARNING (decl) = 1;
3963 /* So must decls that use a type with no linkage. */
3964 FOR_EACH_VEC_ELT (tree, no_linkage_decls, i, decl)
3965 if (!decl_defined_p (decl))
3966 no_linkage_error (decl);
3968 /* Then, do the Objective-C stuff. This is where all the
3969 Objective-C module stuff gets generated (symtab,
3970 class/protocol/selector lists etc). This must be done after C++
3971 templates, destructors etc. so that selectors used in C++
3972 templates are properly allocated. */
3973 if (c_dialect_objc ())
3974 objc_write_global_declarations ();
3976 /* We give C linkage to static constructors and destructors. */
3977 push_lang_context (lang_name_c);
3979 /* Generate initialization and destruction functions for all
3980 priorities for which they are required. */
3981 if (priority_info_map)
3982 splay_tree_foreach (priority_info_map,
3983 generate_ctor_and_dtor_functions_for_priority,
3985 else if (c_dialect_objc () && objc_static_init_needed_p ())
3986 /* If this is obj-c++ and we need a static init, call
3987 generate_ctor_or_dtor_function. */
3988 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3989 DEFAULT_INIT_PRIORITY, &locus);
3991 /* We're done with the splay-tree now. */
3992 if (priority_info_map)
3993 splay_tree_delete (priority_info_map);
3995 /* Generate any missing aliases. */
3996 maybe_apply_pending_pragma_weaks ();
3998 /* We're done with static constructors, so we can go back to "C++"
4000 pop_lang_context ();
4002 /* Collect candidates for Java hidden aliases. */
4003 candidates = collect_candidates_for_java_method_aliases ();
4005 cgraph_finalize_compilation_unit ();
4007 /* Now, issue warnings about static, but not defined, functions,
4008 etc., and emit debugging information. */
4009 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
4010 if (VEC_length (tree, pending_statics) != 0)
4012 check_global_declarations (VEC_address (tree, pending_statics),
4013 VEC_length (tree, pending_statics));
4014 emit_debug_global_declarations (VEC_address (tree, pending_statics),
4015 VEC_length (tree, pending_statics));
4018 perform_deferred_noexcept_checks ();
4020 /* Generate hidden aliases for Java. */
4023 build_java_method_aliases (candidates);
4024 pointer_set_destroy (candidates);
4029 /* The entire file is now complete. If requested, dump everything
4033 FILE *stream = dump_begin (TDI_tu, &flags);
4037 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
4038 dump_end (TDI_tu, stream);
4042 timevar_pop (TV_VARCONST);
4044 if (flag_detailed_statistics)
4046 dump_tree_statistics ();
4047 dump_time_statistics ();
4049 input_location = locus;
4051 #ifdef ENABLE_CHECKING
4052 validate_conversion_obstack ();
4053 #endif /* ENABLE_CHECKING */
4056 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4057 function to call in parse-tree form; it has not yet been
4058 semantically analyzed. ARGS are the arguments to the function.
4059 They have already been semantically analyzed. This may change
4063 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
4066 VEC(tree,gc) *orig_args = NULL;
4071 object = TREE_OPERAND (fn, 0);
4073 if (processing_template_decl)
4075 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
4076 || TREE_CODE (fn) == MEMBER_REF);
4077 if (type_dependent_expression_p (fn)
4078 || any_type_dependent_arguments_p (*args))
4079 return build_nt_call_vec (fn, *args);
4081 orig_args = make_tree_vector_copy (*args);
4083 /* Transform the arguments and add the implicit "this"
4084 parameter. That must be done before the FN is transformed
4085 because we depend on the form of FN. */
4086 make_args_non_dependent (*args);
4087 object = build_non_dependent_expr (object);
4088 if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
4090 if (TREE_CODE (fn) == DOTSTAR_EXPR)
4091 object = cp_build_addr_expr (object, tf_warning_or_error);
4092 VEC_safe_insert (tree, gc, *args, 0, object);
4094 /* Now that the arguments are done, transform FN. */
4095 fn = build_non_dependent_expr (fn);
4098 /* A qualified name corresponding to a bound pointer-to-member is
4099 represented as an OFFSET_REF:
4101 struct B { void g(); };
4103 void B::g() { (this->*p)(); } */
4104 if (TREE_CODE (fn) == OFFSET_REF)
4106 tree object_addr = cp_build_addr_expr (object, tf_warning_or_error);
4107 fn = TREE_OPERAND (fn, 1);
4108 fn = get_member_function_from_ptrfunc (&object_addr, fn);
4109 VEC_safe_insert (tree, gc, *args, 0, object_addr);
4112 if (CLASS_TYPE_P (TREE_TYPE (fn)))
4113 expr = build_op_call (fn, args, tf_warning_or_error);
4115 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
4116 if (processing_template_decl && expr != error_mark_node)
4117 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
4119 if (orig_args != NULL)
4120 release_tree_vector (orig_args);
4127 check_default_args (tree x)
4129 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
4130 bool saw_def = false;
4131 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
4132 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
4134 if (TREE_PURPOSE (arg))
4138 error ("default argument missing for parameter %P of %q+#D", i, x);
4139 TREE_PURPOSE (arg) = error_mark_node;
4144 /* Return true if function DECL can be inlined. This is used to force
4145 instantiation of methods that might be interesting for inlining. */
4147 possibly_inlined_p (tree decl)
4149 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
4150 if (DECL_UNINLINABLE (decl))
4152 if (!optimize || pragma_java_exceptions)
4153 return DECL_DECLARED_INLINE_P (decl);
4154 /* When optimizing, we might inline everything when flatten
4155 attribute or heuristics inlining for size or autoinlining
4160 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4161 If DECL is a specialization or implicitly declared class member,
4162 generate the actual definition. */
4165 mark_used (tree decl)
4167 /* If DECL is a BASELINK for a single function, then treat it just
4168 like the DECL for the function. Otherwise, if the BASELINK is
4169 for an overloaded function, we don't know which function was
4170 actually used until after overload resolution. */
4171 if (TREE_CODE (decl) == BASELINK)
4173 decl = BASELINK_FUNCTIONS (decl);
4174 if (really_overloaded_fn (decl))
4176 decl = OVL_CURRENT (decl);
4179 /* Set TREE_USED for the benefit of -Wunused. */
4180 TREE_USED (decl) = 1;
4181 if (DECL_CLONED_FUNCTION_P (decl))
4182 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4184 if (TREE_CODE (decl) == FUNCTION_DECL
4185 && DECL_DELETED_FN (decl))
4187 if (DECL_ARTIFICIAL (decl))
4189 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
4190 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
4192 /* We mark a lambda conversion op as deleted if we can't
4193 generate it properly; see maybe_add_lambda_conv_op. */
4194 sorry ("converting lambda which uses %<...%> to "
4195 "function pointer");
4199 error ("use of deleted function %qD", decl);
4200 if (!maybe_explain_implicit_delete (decl))
4201 error_at (DECL_SOURCE_LOCATION (decl), "declared here");
4205 /* We can only check DECL_ODR_USED on variables or functions with
4206 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4207 might need special handling for. */
4208 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4209 || DECL_LANG_SPECIFIC (decl) == NULL
4210 || DECL_THUNK_P (decl))
4213 /* We only want to do this processing once. We don't need to keep trying
4214 to instantiate inline templates, because unit-at-a-time will make sure
4215 we get them compiled before functions that want to inline them. */
4216 if (DECL_ODR_USED (decl))
4219 /* If within finish_function, defer the rest until that function
4220 finishes, otherwise it might recurse. */
4221 if (defer_mark_used_calls)
4223 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4227 /* Normally, we can wait until instantiation-time to synthesize DECL.
4228 However, if DECL is a static data member initialized with a constant
4229 or a constexpr function, we need it right now because a reference to
4230 such a data member or a call to such function is not value-dependent. */
4231 if ((decl_maybe_constant_var_p (decl)
4232 || (TREE_CODE (decl) == FUNCTION_DECL
4233 && DECL_DECLARED_CONSTEXPR_P (decl)))
4234 && !DECL_INITIAL (decl)
4235 && DECL_LANG_SPECIFIC (decl)
4236 && DECL_TEMPLATE_INSTANTIATION (decl))
4238 /* Instantiating a function will result in garbage collection. We
4239 must treat this situation as if we were within the body of a
4240 function so as to avoid collecting live data only referenced from
4241 the stack (such as overload resolution candidates). */
4243 instantiate_decl (decl, /*defer_ok=*/false,
4244 /*expl_inst_class_mem_p=*/false);
4248 /* If we don't need a value, then we don't need to synthesize DECL. */
4249 if (cp_unevaluated_operand != 0)
4252 if (processing_template_decl)
4255 /* Check this too in case we're within fold_non_dependent_expr. */
4256 if (DECL_TEMPLATE_INFO (decl)
4257 && uses_template_parms (DECL_TI_ARGS (decl)))
4260 DECL_ODR_USED (decl) = 1;
4261 if (DECL_CLONED_FUNCTION_P (decl))
4262 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4264 /* DR 757: A type without linkage shall not be used as the type of a
4265 variable or function with linkage, unless
4266 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4267 o the variable or function is not used (3.2 [basic.def.odr]) or is
4268 defined in the same translation unit. */
4269 if (cxx_dialect > cxx98
4270 && decl_linkage (decl) != lk_none
4271 && !DECL_EXTERN_C_P (decl)
4272 && !DECL_ARTIFICIAL (decl)
4273 && !decl_defined_p (decl)
4274 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4276 if (is_local_extern (decl))
4277 /* There's no way to define a local extern, and adding it to
4278 the vector interferes with GC, so give an error now. */
4279 no_linkage_error (decl);
4281 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4284 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4285 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4286 /* Remember it, so we can check it was defined. */
4287 note_vague_linkage_fn (decl);
4289 /* Is it a synthesized method that needs to be synthesized? */
4290 if (TREE_CODE (decl) == FUNCTION_DECL
4291 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4292 && DECL_DEFAULTED_FN (decl)
4293 && ! DECL_INITIAL (decl))
4295 /* Remember the current location for a function we will end up
4296 synthesizing. Then we can inform the user where it was
4297 required in the case of error. */
4298 DECL_SOURCE_LOCATION (decl) = input_location;
4300 /* Synthesizing an implicitly defined member function will result in
4301 garbage collection. We must treat this situation as if we were
4302 within the body of a function so as to avoid collecting live data
4303 on the stack (such as overload resolution candidates).
4305 We could just let cp_write_global_declarations handle synthesizing
4306 this function, since we just added it to deferred_fns, but doing
4307 it at the use site produces better error messages. */
4309 synthesize_method (decl);
4311 /* If this is a synthesized method we don't need to
4312 do the instantiation test below. */
4314 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4315 && DECL_TEMPLATE_INFO (decl)
4316 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4317 || always_instantiate_p (decl)))
4318 /* If this is a function or variable that is an instance of some
4319 template, we now know that we will need to actually do the
4320 instantiation. We check that DECL is not an explicit
4321 instantiation because that is not checked in instantiate_decl.
4323 We put off instantiating functions in order to improve compile
4324 times. Maintaining a stack of active functions is expensive,
4325 and the inliner knows to instantiate any functions it might
4326 need. Therefore, we always try to defer instantiation. */
4327 instantiate_decl (decl, /*defer_ok=*/true,
4328 /*expl_inst_class_mem_p=*/false);
4331 #include "gt-cp-decl2.h"