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 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 "tree-mudflap.h"
47 #include "tree-inline.h"
48 #include "c-family/c-pragma.h"
49 #include "tree-dump.h"
52 #include "pointer-set.h"
53 #include "splay-tree.h"
54 #include "langhooks.h"
55 #include "c-family/c-ada-spec.h"
57 extern cpp_reader *parse_in;
59 /* This structure contains information about the initializations
60 and/or destructions required for a particular priority level. */
61 typedef struct priority_info_s {
62 /* Nonzero if there have been any initializations at this priority
63 throughout the translation unit. */
64 int initializations_p;
65 /* Nonzero if there have been any destructions at this priority
66 throughout the translation unit. */
70 static void mark_vtable_entries (tree);
71 static bool maybe_emit_vtables (tree);
72 static bool acceptable_java_type (tree);
73 static tree start_objects (int, int);
74 static void finish_objects (int, int, tree);
75 static tree start_static_storage_duration_function (unsigned);
76 static void finish_static_storage_duration_function (tree);
77 static priority_info get_priority_info (int);
78 static void do_static_initialization_or_destruction (tree, bool);
79 static void one_static_initialization_or_destruction (tree, tree, bool);
80 static void generate_ctor_or_dtor_function (bool, int, location_t *);
81 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
83 static tree prune_vars_needing_no_initialization (tree *);
84 static void write_out_vars (tree);
85 static void import_export_class (tree);
86 static tree get_guard_bits (tree);
87 static void determine_visibility_from_class (tree, tree);
88 static bool decl_defined_p (tree);
90 /* A list of static class variables. This is needed, because a
91 static class variable can be declared inside the class without
92 an initializer, and then initialized, statically, outside the class. */
93 static GTY(()) VEC(tree,gc) *pending_statics;
95 /* A list of functions which were declared inline, but which we
96 may need to emit outline anyway. */
97 static GTY(()) VEC(tree,gc) *deferred_fns;
99 /* A list of decls that use types with no linkage, which we need to make
101 static GTY(()) VEC(tree,gc) *no_linkage_decls;
103 /* Nonzero if we're done parsing and into end-of-file activities. */
109 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
110 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
111 that apply to the function). */
114 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
120 if (fntype == error_mark_node || ctype == error_mark_node)
121 return error_mark_node;
123 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
124 || TREE_CODE (fntype) == METHOD_TYPE);
126 type_quals = quals & ~TYPE_QUAL_RESTRICT;
127 ctype = cp_build_qualified_type (ctype, type_quals);
128 raises = TYPE_RAISES_EXCEPTIONS (fntype);
129 attrs = TYPE_ATTRIBUTES (fntype);
130 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
131 (TREE_CODE (fntype) == METHOD_TYPE
132 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
133 : TYPE_ARG_TYPES (fntype)));
135 fntype = build_exception_variant (fntype, raises);
137 fntype = cp_build_type_attribute_variant (fntype, attrs);
142 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
143 return type changed to NEW_RET. */
146 change_return_type (tree new_ret, tree fntype)
149 tree args = TYPE_ARG_TYPES (fntype);
150 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
151 tree attrs = TYPE_ATTRIBUTES (fntype);
153 if (same_type_p (new_ret, TREE_TYPE (fntype)))
156 if (TREE_CODE (fntype) == FUNCTION_TYPE)
158 newtype = build_function_type (new_ret, args);
159 newtype = apply_memfn_quals (newtype, type_memfn_quals (fntype));
162 newtype = build_method_type_directly
163 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype))),
164 new_ret, TREE_CHAIN (args));
166 newtype = build_exception_variant (newtype, raises);
168 newtype = cp_build_type_attribute_variant (newtype, attrs);
173 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
177 cp_build_parm_decl (tree name, tree type)
179 tree parm = build_decl (input_location,
180 PARM_DECL, name, type);
181 /* DECL_ARG_TYPE is only used by the back end and the back end never
183 if (!processing_template_decl)
184 DECL_ARG_TYPE (parm) = type_passed_as (type);
186 /* If the type is a pack expansion, then we have a function
188 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
189 FUNCTION_PARAMETER_PACK_P (parm) = 1;
194 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
198 build_artificial_parm (tree name, tree type)
200 tree parm = cp_build_parm_decl (name, type);
201 DECL_ARTIFICIAL (parm) = 1;
202 /* All our artificial parms are implicitly `const'; they cannot be
204 TREE_READONLY (parm) = 1;
208 /* Constructors for types with virtual baseclasses need an "in-charge" flag
209 saying whether this constructor is responsible for initialization of
210 virtual baseclasses or not. All destructors also need this "in-charge"
211 flag, which additionally determines whether or not the destructor should
212 free the memory for the object.
214 This function adds the "in-charge" flag to member function FN if
215 appropriate. It is called from grokclassfn and tsubst.
216 FN must be either a constructor or destructor.
218 The in-charge flag follows the 'this' parameter, and is followed by the
219 VTT parm (if any), then the user-written parms. */
222 maybe_retrofit_in_chrg (tree fn)
224 tree basetype, arg_types, parms, parm, fntype;
226 /* If we've already add the in-charge parameter don't do it again. */
227 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
230 /* When processing templates we can't know, in general, whether or
231 not we're going to have virtual baseclasses. */
232 if (processing_template_decl)
235 /* We don't need an in-charge parameter for constructors that don't
236 have virtual bases. */
237 if (DECL_CONSTRUCTOR_P (fn)
238 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
241 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
242 basetype = TREE_TYPE (TREE_VALUE (arg_types));
243 arg_types = TREE_CHAIN (arg_types);
245 parms = DECL_CHAIN (DECL_ARGUMENTS (fn));
247 /* If this is a subobject constructor or destructor, our caller will
248 pass us a pointer to our VTT. */
249 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
251 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
253 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
254 DECL_CHAIN (parm) = parms;
257 /* ...and then to TYPE_ARG_TYPES. */
258 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
260 DECL_HAS_VTT_PARM_P (fn) = 1;
263 /* Then add the in-charge parm (before the VTT parm). */
264 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
265 DECL_CHAIN (parm) = parms;
267 arg_types = hash_tree_chain (integer_type_node, arg_types);
269 /* Insert our new parameter(s) into the list. */
270 DECL_CHAIN (DECL_ARGUMENTS (fn)) = parms;
272 /* And rebuild the function type. */
273 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
275 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
276 fntype = build_exception_variant (fntype,
277 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
278 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
279 fntype = (cp_build_type_attribute_variant
280 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
281 TREE_TYPE (fn) = fntype;
283 /* Now we've got the in-charge parameter. */
284 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
287 /* Classes overload their constituent function names automatically.
288 When a function name is declared in a record structure,
289 its name is changed to it overloaded name. Since names for
290 constructors and destructors can conflict, we place a leading
293 CNAME is the name of the class we are grokking for.
295 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
297 FLAGS contains bits saying what's special about today's
298 arguments. DTOR_FLAG == DESTRUCTOR.
300 If FUNCTION is a destructor, then we must add the `auto-delete' field
301 as a second parameter. There is some hair associated with the fact
302 that we must "declare" this variable in the manner consistent with the
303 way the rest of the arguments were declared.
305 QUALS are the qualifiers for the this pointer. */
308 grokclassfn (tree ctype, tree function, enum overload_flags flags)
310 tree fn_name = DECL_NAME (function);
312 /* Even within an `extern "C"' block, members get C++ linkage. See
313 [dcl.link] for details. */
314 SET_DECL_LANGUAGE (function, lang_cplusplus);
316 if (fn_name == NULL_TREE)
318 error ("name missing for member function");
319 fn_name = get_identifier ("<anonymous>");
320 DECL_NAME (function) = fn_name;
323 DECL_CONTEXT (function) = ctype;
325 if (flags == DTOR_FLAG)
326 DECL_DESTRUCTOR_P (function) = 1;
328 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
329 maybe_retrofit_in_chrg (function);
332 /* Create an ARRAY_REF, checking for the user doing things backwards
336 grok_array_decl (tree array_expr, tree index_exp)
340 tree orig_array_expr = array_expr;
341 tree orig_index_exp = index_exp;
343 if (error_operand_p (array_expr) || error_operand_p (index_exp))
344 return error_mark_node;
346 if (processing_template_decl)
348 if (type_dependent_expression_p (array_expr)
349 || type_dependent_expression_p (index_exp))
350 return build_min_nt (ARRAY_REF, array_expr, index_exp,
351 NULL_TREE, NULL_TREE);
352 array_expr = build_non_dependent_expr (array_expr);
353 index_exp = build_non_dependent_expr (index_exp);
356 type = TREE_TYPE (array_expr);
358 type = non_reference (type);
360 /* If they have an `operator[]', use that. */
361 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
362 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
363 array_expr, index_exp, NULL_TREE,
364 /*overloaded_p=*/NULL, tf_warning_or_error);
369 /* Otherwise, create an ARRAY_REF for a pointer or array type.
370 It is a little-known fact that, if `a' is an array and `i' is
371 an int, you can write `i[a]', which means the same thing as
373 if (TREE_CODE (type) == ARRAY_TYPE)
376 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
378 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
381 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
383 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
385 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
388 if ((p1 && i2) && (i1 && p2))
389 error ("ambiguous conversion for array subscript");
392 array_expr = p1, index_exp = i2;
394 array_expr = p2, index_exp = i1;
397 error ("invalid types %<%T[%T]%> for array subscript",
398 type, TREE_TYPE (index_exp));
399 return error_mark_node;
402 if (array_expr == error_mark_node || index_exp == error_mark_node)
403 error ("ambiguous conversion for array subscript");
405 expr = build_array_ref (input_location, array_expr, index_exp);
407 if (processing_template_decl && expr != error_mark_node)
408 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
409 NULL_TREE, NULL_TREE);
413 /* Given the cast expression EXP, checking out its validity. Either return
414 an error_mark_node if there was an unavoidable error, return a cast to
415 void for trying to delete a pointer w/ the value 0, or return the
416 call to delete. If DOING_VEC is true, we handle things differently
417 for doing an array delete.
418 Implements ARM $5.3.4. This is called from the parser. */
421 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
425 if (exp == error_mark_node)
428 if (processing_template_decl)
430 t = build_min (DELETE_EXPR, void_type_node, exp, size);
431 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
432 DELETE_EXPR_USE_VEC (t) = doing_vec;
433 TREE_SIDE_EFFECTS (t) = 1;
437 /* An array can't have been allocated by new, so complain. */
438 if (TREE_CODE (exp) == VAR_DECL
439 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
440 warning (0, "deleting array %q#D", exp);
442 t = build_expr_type_conversion (WANT_POINTER, exp, true);
444 if (t == NULL_TREE || t == error_mark_node)
446 error ("type %q#T argument given to %<delete%>, expected pointer",
448 return error_mark_node;
451 type = TREE_TYPE (t);
453 /* As of Valley Forge, you can delete a pointer to const. */
455 /* You can't delete functions. */
456 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
458 error ("cannot delete a function. Only pointer-to-objects are "
459 "valid arguments to %<delete%>");
460 return error_mark_node;
463 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
464 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
466 warning (0, "deleting %qT is undefined", type);
470 /* Deleting a pointer with the value zero is valid and has no effect. */
471 if (integer_zerop (t))
472 return build1 (NOP_EXPR, void_type_node, t);
475 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
476 sfk_deleting_destructor,
479 return build_delete (type, t, sfk_deleting_destructor,
480 LOOKUP_NORMAL, use_global_delete);
483 /* Report an error if the indicated template declaration is not the
484 sort of thing that should be a member template. */
487 check_member_template (tree tmpl)
491 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
492 decl = DECL_TEMPLATE_RESULT (tmpl);
494 if (TREE_CODE (decl) == FUNCTION_DECL
495 || (TREE_CODE (decl) == TYPE_DECL
496 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
498 /* The parser rejects template declarations in local classes. */
499 gcc_assert (!current_function_decl);
500 /* The parser rejects any use of virtual in a function template. */
501 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
502 && DECL_VIRTUAL_P (decl)));
504 /* The debug-information generating code doesn't know what to do
505 with member templates. */
506 DECL_IGNORED_P (tmpl) = 1;
509 error ("template declaration of %q#D", decl);
512 /* Return true iff TYPE is a valid Java parameter or return type. */
515 acceptable_java_type (tree type)
517 if (type == error_mark_node)
520 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
522 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
524 type = TREE_TYPE (type);
525 if (TREE_CODE (type) == RECORD_TYPE)
528 if (! TYPE_FOR_JAVA (type))
530 if (! CLASSTYPE_TEMPLATE_INFO (type))
532 args = CLASSTYPE_TI_ARGS (type);
533 i = TREE_VEC_LENGTH (args);
536 type = TREE_VEC_ELT (args, i);
537 if (TREE_CODE (type) == POINTER_TYPE)
538 type = TREE_TYPE (type);
539 if (! TYPE_FOR_JAVA (type))
548 /* For a METHOD in a Java class CTYPE, return true if
549 the parameter and return types are valid Java types.
550 Otherwise, print appropriate error messages, and return false. */
553 check_java_method (tree method)
556 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
557 tree ret_type = TREE_TYPE (TREE_TYPE (method));
559 if (!acceptable_java_type (ret_type))
561 error ("Java method %qD has non-Java return type %qT",
566 arg_types = TREE_CHAIN (arg_types);
567 if (DECL_HAS_IN_CHARGE_PARM_P (method))
568 arg_types = TREE_CHAIN (arg_types);
569 if (DECL_HAS_VTT_PARM_P (method))
570 arg_types = TREE_CHAIN (arg_types);
572 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
574 tree type = TREE_VALUE (arg_types);
575 if (!acceptable_java_type (type))
577 if (type != error_mark_node)
578 error ("Java method %qD has non-Java parameter type %qT",
586 /* Sanity check: report error if this function FUNCTION is not
587 really a member of the class (CTYPE) it is supposed to belong to.
588 TEMPLATE_PARMS is used to specify the template parameters of a member
589 template passed as FUNCTION_DECL. If the member template is passed as a
590 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
591 from the declaration. If the function is not a function template, it
593 It returns the original declaration for the function, NULL_TREE if
594 no declaration was found, error_mark_node if an error was emitted. */
597 check_classfn (tree ctype, tree function, tree template_parms)
603 if (DECL_USE_TEMPLATE (function)
604 && !(TREE_CODE (function) == TEMPLATE_DECL
605 && DECL_TEMPLATE_SPECIALIZATION (function))
606 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
607 /* Since this is a specialization of a member template,
608 we're not going to find the declaration in the class.
611 struct S { template <typename T> void f(T); };
612 template <> void S::f(int);
614 we're not going to find `S::f(int)', but there's no
615 reason we should, either. We let our callers know we didn't
616 find the method, but we don't complain. */
619 /* Basic sanity check: for a template function, the template parameters
620 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
621 if (TREE_CODE (function) == TEMPLATE_DECL)
624 && !comp_template_parms (template_parms,
625 DECL_TEMPLATE_PARMS (function)))
627 error ("template parameter lists provided don't match the "
628 "template parameters of %qD", function);
629 return error_mark_node;
631 template_parms = DECL_TEMPLATE_PARMS (function);
634 /* OK, is this a definition of a member template? */
635 is_template = (template_parms != NULL_TREE);
637 /* We must enter the scope here, because conversion operators are
638 named by target type, and type equivalence relies on typenames
639 resolving within the scope of CTYPE. */
640 pushed_scope = push_scope (ctype);
641 ix = class_method_index_for_fn (complete_type (ctype), function);
644 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
645 tree fndecls, fndecl = 0;
647 const char *format = NULL;
649 for (fndecls = VEC_index (tree, methods, ix);
650 fndecls; fndecls = OVL_NEXT (fndecls))
654 fndecl = OVL_CURRENT (fndecls);
655 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
656 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
658 /* We cannot simply call decls_match because this doesn't
659 work for static member functions that are pretending to
660 be methods, and because the name may have been changed by
663 /* Get rid of the this parameter on functions that become
665 if (DECL_STATIC_FUNCTION_P (fndecl)
666 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
667 p1 = TREE_CHAIN (p1);
669 /* A member template definition only matches a member template
671 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
674 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
675 TREE_TYPE (TREE_TYPE (fndecl)))
676 && compparms (p1, p2)
678 || comp_template_parms (template_parms,
679 DECL_TEMPLATE_PARMS (fndecl)))
680 && (DECL_TEMPLATE_SPECIALIZATION (function)
681 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
682 && (!DECL_TEMPLATE_SPECIALIZATION (function)
683 || (DECL_TI_TEMPLATE (function)
684 == DECL_TI_TEMPLATE (fndecl))))
690 pop_scope (pushed_scope);
691 return OVL_CURRENT (fndecls);
694 error_at (DECL_SOURCE_LOCATION (function),
695 "prototype for %q#D does not match any in class %qT",
697 is_conv_op = DECL_CONV_FN_P (fndecl);
700 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
701 fndecls = VEC_index (tree, methods, ix);
704 fndecl = OVL_CURRENT (fndecls);
705 fndecls = OVL_NEXT (fndecls);
707 if (!fndecls && is_conv_op)
709 if (VEC_length (tree, methods) > (size_t) ++ix)
711 fndecls = VEC_index (tree, methods, ix);
712 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
724 format = N_("candidates are: %+#D");
726 format = N_("candidate is: %+#D");
727 error (format, fndecl);
730 else if (!COMPLETE_TYPE_P (ctype))
731 cxx_incomplete_type_error (function, ctype);
733 error ("no %q#D member function declared in class %qT",
737 pop_scope (pushed_scope);
738 return error_mark_node;
741 /* DECL is a function with vague linkage. Remember it so that at the
742 end of the translation unit we can decide whether or not to emit
746 note_vague_linkage_fn (tree decl)
748 DECL_DEFER_OUTPUT (decl) = 1;
749 VEC_safe_push (tree, gc, deferred_fns, decl);
752 /* We have just processed the DECL, which is a static data member.
753 The other parameters are as for cp_finish_decl. */
756 finish_static_data_member_decl (tree decl,
757 tree init, bool init_const_expr_p,
761 DECL_CONTEXT (decl) = current_class_type;
763 /* We cannot call pushdecl here, because that would fill in the
764 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
765 the right thing, namely, to put this decl out straight away. */
767 if (! processing_template_decl)
768 VEC_safe_push (tree, gc, pending_statics, decl);
770 if (LOCAL_CLASS_P (current_class_type))
771 permerror (input_location, "local class %q#T shall not have static data member %q#D",
772 current_class_type, decl);
774 DECL_IN_AGGR_P (decl) = 1;
776 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
777 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
778 SET_VAR_HAD_UNKNOWN_BOUND (decl);
780 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
783 /* DECLARATOR and DECLSPECS correspond to a class member. The other
784 parameters are as for cp_finish_decl. Return the DECL for the
785 class member declared. */
788 grokfield (const cp_declarator *declarator,
789 cp_decl_specifier_seq *declspecs,
790 tree init, bool init_const_expr_p,
795 const char *asmspec = 0;
796 int flags = LOOKUP_ONLYCONVERTING;
800 && TREE_CODE (init) == TREE_LIST
801 && TREE_VALUE (init) == error_mark_node
802 && TREE_CHAIN (init) == NULL_TREE)
805 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
806 if (! value || error_operand_p (value))
807 /* friend or constructor went bad. */
808 return error_mark_node;
810 if (TREE_CODE (value) == TYPE_DECL && init)
812 error ("typedef %qD is initialized (use decltype instead)", value);
816 /* Pass friendly classes back. */
817 if (value == void_type_node)
820 /* Pass friend decls back. */
821 if ((TREE_CODE (value) == FUNCTION_DECL
822 || TREE_CODE (value) == TEMPLATE_DECL)
823 && DECL_CONTEXT (value) != current_class_type)
826 name = DECL_NAME (value);
828 if (name != NULL_TREE)
830 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
832 error ("explicit template argument list not allowed");
833 return error_mark_node;
836 if (IDENTIFIER_POINTER (name)[0] == '_'
837 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
838 error ("member %qD conflicts with virtual function table field name",
842 /* Stash away type declarations. */
843 if (TREE_CODE (value) == TYPE_DECL)
845 DECL_NONLOCAL (value) = 1;
846 DECL_CONTEXT (value) = current_class_type;
848 if (processing_template_decl)
849 value = push_template_decl (value);
855 /* If this is a typedef that names the class for linkage purposes
856 (7.1.3p8), apply any attributes directly to the type. */
857 if (TAGGED_TYPE_P (TREE_TYPE (value))
858 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
859 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
861 cplus_decl_attributes (&value, attrlist, attrflags);
864 if (declspecs->specs[(int)ds_typedef]
865 && TREE_TYPE (value) != error_mark_node
866 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
867 cp_set_underlying_type (value);
872 if (DECL_IN_AGGR_P (value))
874 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
875 return void_type_node;
878 if (asmspec_tree && asmspec_tree != error_mark_node)
879 asmspec = TREE_STRING_POINTER (asmspec_tree);
883 if (TREE_CODE (value) == FUNCTION_DECL)
885 /* Initializers for functions are rejected early in the parser.
886 If we get here, it must be a pure specifier for a method. */
887 if (init == ridpointers[(int)RID_DELETE])
889 DECL_DELETED_FN (value) = 1;
890 DECL_DECLARED_INLINE_P (value) = 1;
891 DECL_INITIAL (value) = error_mark_node;
893 else if (init == ridpointers[(int)RID_DEFAULT])
895 if (defaultable_fn_check (value))
897 DECL_DEFAULTED_FN (value) = 1;
898 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
899 DECL_DECLARED_INLINE_P (value) = 1;
902 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
904 if (integer_zerop (init))
905 DECL_PURE_VIRTUAL_P (value) = 1;
906 else if (error_operand_p (init))
907 ; /* An error has already been reported. */
909 error ("invalid initializer for member function %qD",
914 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
915 error ("initializer specified for static member function %qD",
919 else if (pedantic && TREE_CODE (value) != VAR_DECL)
920 /* Already complained in grokdeclarator. */
922 else if (!processing_template_decl)
924 if (TREE_CODE (init) == CONSTRUCTOR)
925 init = digest_init (TREE_TYPE (value), init);
926 init = maybe_constant_init (init);
928 if (init != error_mark_node && !TREE_CONSTANT (init))
930 /* We can allow references to things that are effectively
931 static, since references are initialized with the
933 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
934 || (TREE_STATIC (init) == 0
935 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
937 error ("field initializer is not constant");
938 init = error_mark_node;
944 if (processing_template_decl
945 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
947 value = push_template_decl (value);
948 if (error_operand_p (value))
949 return error_mark_node;
953 cplus_decl_attributes (&value, attrlist, 0);
955 switch (TREE_CODE (value))
958 finish_static_data_member_decl (value, init, init_const_expr_p,
959 asmspec_tree, flags);
964 error ("%<asm%> specifiers are not permitted on non-static data members");
965 if (DECL_INITIAL (value) == error_mark_node)
966 init = error_mark_node;
967 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
969 DECL_INITIAL (value) = init;
970 DECL_IN_AGGR_P (value) = 1;
975 set_user_assembler_name (value, asmspec);
977 cp_finish_decl (value,
979 /*init_const_expr_p=*/false,
980 asmspec_tree, flags);
982 /* Pass friends back this way. */
983 if (DECL_FRIEND_P (value))
984 return void_type_node;
986 DECL_IN_AGGR_P (value) = 1;
995 /* Like `grokfield', but for bitfields.
996 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
999 grokbitfield (const cp_declarator *declarator,
1000 cp_decl_specifier_seq *declspecs, tree width,
1003 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1005 if (value == error_mark_node)
1006 return NULL_TREE; /* friends went bad. */
1008 /* Pass friendly classes back. */
1009 if (TREE_CODE (value) == VOID_TYPE)
1010 return void_type_node;
1012 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
1013 && (POINTER_TYPE_P (value)
1014 || !dependent_type_p (TREE_TYPE (value))))
1016 error ("bit-field %qD with non-integral type", value);
1017 return error_mark_node;
1020 if (TREE_CODE (value) == TYPE_DECL)
1022 error ("cannot declare %qD to be a bit-field type", value);
1026 /* Usually, finish_struct_1 catches bitfields with invalid types.
1027 But, in the case of bitfields with function type, we confuse
1028 ourselves into thinking they are member functions, so we must
1030 if (TREE_CODE (value) == FUNCTION_DECL)
1032 error ("cannot declare bit-field %qD with function type",
1037 if (DECL_IN_AGGR_P (value))
1039 error ("%qD is already defined in the class %qT", value,
1040 DECL_CONTEXT (value));
1041 return void_type_node;
1044 if (TREE_STATIC (value))
1046 error ("static member %qD cannot be a bit-field", value);
1049 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1051 if (width != error_mark_node)
1053 /* The width must be an integer type. */
1054 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width)))
1055 error ("width of bit-field %qD has non-integral type %qT", value,
1057 constant_expression_warning (width);
1058 DECL_INITIAL (value) = width;
1059 SET_DECL_C_BIT_FIELD (value);
1062 DECL_IN_AGGR_P (value) = 1;
1065 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1071 /* Returns true iff ATTR is an attribute which needs to be applied at
1072 instantiation time rather than template definition time. */
1075 is_late_template_attribute (tree attr, tree decl)
1077 tree name = TREE_PURPOSE (attr);
1078 tree args = TREE_VALUE (attr);
1079 const struct attribute_spec *spec = lookup_attribute_spec (name);
1083 /* Unknown attribute. */
1086 /* Attribute weak handling wants to write out assembly right away. */
1087 if (is_attribute_p ("weak", name))
1090 /* If any of the arguments are dependent expressions, we can't evaluate
1091 the attribute until instantiation time. */
1092 for (arg = args; arg; arg = TREE_CHAIN (arg))
1094 tree t = TREE_VALUE (arg);
1096 /* If the first attribute argument is an identifier, only consider
1097 second and following arguments. Attributes like mode, format,
1098 cleanup and several target specific attributes aren't late
1099 just because they have an IDENTIFIER_NODE as first argument. */
1100 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1103 if (value_dependent_expression_p (t)
1104 || type_dependent_expression_p (t))
1108 if (TREE_CODE (decl) == TYPE_DECL
1110 || spec->type_required)
1112 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1114 /* We can't apply any attributes to a completely unknown type until
1115 instantiation time. */
1116 enum tree_code code = TREE_CODE (type);
1117 if (code == TEMPLATE_TYPE_PARM
1118 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1119 || code == TYPENAME_TYPE)
1121 /* Also defer most attributes on dependent types. This is not
1122 necessary in all cases, but is the better default. */
1123 else if (dependent_type_p (type)
1124 /* But attribute visibility specifically works on
1126 && !is_attribute_p ("visibility", name))
1135 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1136 applied at instantiation time and return them. If IS_DEPENDENT is true,
1137 the declaration itself is dependent, so all attributes should be applied
1138 at instantiation time. */
1141 splice_template_attributes (tree *attr_p, tree decl)
1144 tree late_attrs = NULL_TREE;
1145 tree *q = &late_attrs;
1152 if (is_late_template_attribute (*p, decl))
1154 ATTR_IS_DEPENDENT (*p) = 1;
1156 *p = TREE_CHAIN (*p);
1157 q = &TREE_CHAIN (*q);
1161 p = &TREE_CHAIN (*p);
1167 /* Remove any late attributes from the list in ATTR_P and attach them to
1171 save_template_attributes (tree *attr_p, tree *decl_p)
1173 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1175 tree old_attrs = NULL_TREE;
1180 if (DECL_P (*decl_p))
1181 q = &DECL_ATTRIBUTES (*decl_p);
1183 q = &TYPE_ATTRIBUTES (*decl_p);
1187 /* Place the late attributes at the beginning of the attribute
1189 TREE_CHAIN (tree_last (late_attrs)) = *q;
1192 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1194 /* We've added new attributes directly to the main variant, so
1195 now we need to update all of the other variants to include
1196 these new attributes. */
1198 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1199 variant = TYPE_NEXT_VARIANT (variant))
1201 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1202 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1207 /* Like reconstruct_complex_type, but handle also template trees. */
1210 cp_reconstruct_complex_type (tree type, tree bottom)
1214 if (TREE_CODE (type) == POINTER_TYPE)
1216 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1217 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1218 TYPE_REF_CAN_ALIAS_ALL (type));
1220 else if (TREE_CODE (type) == REFERENCE_TYPE)
1222 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1223 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1224 TYPE_REF_CAN_ALIAS_ALL (type));
1226 else if (TREE_CODE (type) == ARRAY_TYPE)
1228 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1229 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1230 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1231 element type qualification will be handled by the recursive
1232 cp_reconstruct_complex_type call and cp_build_qualified_type
1233 for ARRAY_TYPEs changes the element type. */
1236 else if (TREE_CODE (type) == FUNCTION_TYPE)
1238 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1239 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1240 outer = apply_memfn_quals (outer, type_memfn_quals (type));
1242 else if (TREE_CODE (type) == METHOD_TYPE)
1244 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1245 /* The build_method_type_directly() routine prepends 'this' to argument list,
1246 so we must compensate by getting rid of it. */
1248 = build_method_type_directly
1249 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1251 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1253 else if (TREE_CODE (type) == OFFSET_TYPE)
1255 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1256 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1261 if (TYPE_ATTRIBUTES (type))
1262 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1263 return cp_build_qualified_type (outer, cp_type_quals (type));
1266 /* Like decl_attributes, but handle C++ complexity. */
1269 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1271 if (*decl == NULL_TREE || *decl == void_type_node
1272 || *decl == error_mark_node
1273 || attributes == NULL_TREE)
1276 if (processing_template_decl)
1278 if (check_for_bare_parameter_packs (attributes))
1281 save_template_attributes (&attributes, decl);
1282 if (attributes == NULL_TREE)
1286 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1287 decl = &DECL_TEMPLATE_RESULT (*decl);
1289 decl_attributes (decl, attributes, flags);
1291 if (TREE_CODE (*decl) == TYPE_DECL)
1292 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1295 /* Walks through the namespace- or function-scope anonymous union
1296 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1297 Returns one of the fields for use in the mangled name. */
1300 build_anon_union_vars (tree type, tree object)
1302 tree main_decl = NULL_TREE;
1305 /* Rather than write the code to handle the non-union case,
1306 just give an error. */
1307 if (TREE_CODE (type) != UNION_TYPE)
1308 error ("anonymous struct not inside named type");
1310 for (field = TYPE_FIELDS (type);
1312 field = DECL_CHAIN (field))
1317 if (DECL_ARTIFICIAL (field))
1319 if (TREE_CODE (field) != FIELD_DECL)
1321 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1322 "have non-static data members", field);
1326 if (TREE_PRIVATE (field))
1327 permerror (input_location, "private member %q+#D in anonymous union", field);
1328 else if (TREE_PROTECTED (field))
1329 permerror (input_location, "protected member %q+#D in anonymous union", field);
1331 if (processing_template_decl)
1332 ref = build_min_nt (COMPONENT_REF, object,
1333 DECL_NAME (field), NULL_TREE);
1335 ref = build_class_member_access_expr (object, field, NULL_TREE,
1336 false, tf_warning_or_error);
1338 if (DECL_NAME (field))
1342 decl = build_decl (input_location,
1343 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1344 DECL_ANON_UNION_VAR_P (decl) = 1;
1345 DECL_ARTIFICIAL (decl) = 1;
1347 base = get_base_address (object);
1348 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1349 TREE_STATIC (decl) = TREE_STATIC (base);
1350 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1352 SET_DECL_VALUE_EXPR (decl, ref);
1353 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1355 decl = pushdecl (decl);
1357 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1358 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1362 if (main_decl == NULL_TREE)
1369 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1370 anonymous union, then all members must be laid out together. PUBLIC_P
1371 is nonzero if this union is not declared static. */
1374 finish_anon_union (tree anon_union_decl)
1380 if (anon_union_decl == error_mark_node)
1383 type = TREE_TYPE (anon_union_decl);
1384 public_p = TREE_PUBLIC (anon_union_decl);
1386 /* The VAR_DECL's context is the same as the TYPE's context. */
1387 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1389 if (TYPE_FIELDS (type) == NULL_TREE)
1394 error ("namespace-scope anonymous aggregates must be static");
1398 main_decl = build_anon_union_vars (type, anon_union_decl);
1399 if (main_decl == error_mark_node)
1401 if (main_decl == NULL_TREE)
1403 warning (0, "anonymous union with no members");
1407 if (!processing_template_decl)
1409 /* Use main_decl to set the mangled name. */
1410 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1411 maybe_commonize_var (anon_union_decl);
1412 mangle_decl (anon_union_decl);
1413 DECL_NAME (anon_union_decl) = NULL_TREE;
1416 pushdecl (anon_union_decl);
1417 if (building_stmt_tree ()
1418 && at_function_scope_p ())
1419 add_decl_expr (anon_union_decl);
1420 else if (!processing_template_decl)
1421 rest_of_decl_compilation (anon_union_decl,
1422 toplevel_bindings_p (), at_eof);
1425 /* Auxiliary functions to make type signatures for
1426 `operator new' and `operator delete' correspond to
1427 what compiler will be expecting. */
1430 coerce_new_type (tree type)
1433 tree args = TYPE_ARG_TYPES (type);
1435 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1437 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1440 error ("%<operator new%> must return type %qT", ptr_type_node);
1443 if (args && args != void_list_node)
1445 if (TREE_PURPOSE (args))
1447 /* [basic.stc.dynamic.allocation]
1449 The first parameter shall not have an associated default
1451 error ("the first parameter of %<operator new%> cannot "
1452 "have a default argument");
1453 /* Throw away the default argument. */
1454 TREE_PURPOSE (args) = NULL_TREE;
1457 if (!same_type_p (TREE_VALUE (args), size_type_node))
1460 args = TREE_CHAIN (args);
1467 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1468 "as first parameter", size_type_node);
1473 args = tree_cons (NULL_TREE, size_type_node, args);
1476 type = build_exception_variant
1477 (build_function_type (ptr_type_node, args),
1478 TYPE_RAISES_EXCEPTIONS (type));
1486 coerce_delete_type (tree type)
1489 tree args = TYPE_ARG_TYPES (type);
1491 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1493 if (!same_type_p (TREE_TYPE (type), void_type_node))
1496 error ("%<operator delete%> must return type %qT", void_type_node);
1499 if (!args || args == void_list_node
1500 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1503 if (args && args != void_list_node)
1504 args = TREE_CHAIN (args);
1505 error ("%<operator delete%> takes type %qT as first parameter",
1511 args = tree_cons (NULL_TREE, ptr_type_node, args);
1514 type = build_exception_variant
1515 (build_function_type (void_type_node, args),
1516 TYPE_RAISES_EXCEPTIONS (type));
1524 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1525 and mark them as needed. */
1528 mark_vtable_entries (tree decl)
1531 unsigned HOST_WIDE_INT idx;
1533 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1538 STRIP_NOPS (fnaddr);
1540 if (TREE_CODE (fnaddr) != ADDR_EXPR
1541 && TREE_CODE (fnaddr) != FDESC_EXPR)
1542 /* This entry is an offset: a virtual base class offset, a
1543 virtual call offset, an RTTI offset, etc. */
1546 fn = TREE_OPERAND (fnaddr, 0);
1547 TREE_ADDRESSABLE (fn) = 1;
1548 /* When we don't have vcall offsets, we output thunks whenever
1549 we output the vtables that contain them. With vcall offsets,
1550 we know all the thunks we'll need when we emit a virtual
1551 function, so we emit the thunks there instead. */
1552 if (DECL_THUNK_P (fn))
1553 use_thunk (fn, /*emit_p=*/0);
1558 /* Set DECL up to have the closest approximation of "initialized common"
1559 linkage available. */
1562 comdat_linkage (tree decl)
1565 make_decl_one_only (decl, cxx_comdat_group (decl));
1566 else if (TREE_CODE (decl) == FUNCTION_DECL
1567 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1568 /* We can just emit function and compiler-generated variables
1569 statically; having multiple copies is (for the most part) only
1572 There are two correctness issues, however: the address of a
1573 template instantiation with external linkage should be the
1574 same, independent of what translation unit asks for the
1575 address, and this will not hold when we emit multiple copies of
1576 the function. However, there's little else we can do.
1578 Also, by default, the typeinfo implementation assumes that
1579 there will be only one copy of the string used as the name for
1580 each type. Therefore, if weak symbols are unavailable, the
1581 run-time library should perform a more conservative check; it
1582 should perform a string comparison, rather than an address
1584 TREE_PUBLIC (decl) = 0;
1587 /* Static data member template instantiations, however, cannot
1588 have multiple copies. */
1589 if (DECL_INITIAL (decl) == 0
1590 || DECL_INITIAL (decl) == error_mark_node)
1591 DECL_COMMON (decl) = 1;
1592 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1594 DECL_COMMON (decl) = 1;
1595 DECL_INITIAL (decl) = error_mark_node;
1597 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1599 /* We can't do anything useful; leave vars for explicit
1601 DECL_EXTERNAL (decl) = 1;
1602 DECL_NOT_REALLY_EXTERN (decl) = 0;
1606 DECL_COMDAT (decl) = 1;
1609 /* For win32 we also want to put explicit instantiations in
1610 linkonce sections, so that they will be merged with implicit
1611 instantiations; otherwise we get duplicate symbol errors.
1612 For Darwin we do not want explicit instantiations to be
1616 maybe_make_one_only (tree decl)
1618 /* We used to say that this was not necessary on targets that support weak
1619 symbols, because the implicit instantiations will defer to the explicit
1620 one. However, that's not actually the case in SVR4; a strong definition
1621 after a weak one is an error. Also, not making explicit
1622 instantiations one_only means that we can end up with two copies of
1623 some template instantiations. */
1627 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1628 we can get away with not emitting them if they aren't used. We need
1629 to for variables so that cp_finish_decl will update their linkage,
1630 because their DECL_INITIAL may not have been set properly yet. */
1632 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1633 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1634 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1636 make_decl_one_only (decl, cxx_comdat_group (decl));
1638 if (TREE_CODE (decl) == VAR_DECL)
1640 DECL_COMDAT (decl) = 1;
1641 /* Mark it needed so we don't forget to emit it. */
1642 mark_decl_referenced (decl);
1647 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1648 This predicate will give the right answer during parsing of the
1649 function, which other tests may not. */
1652 vague_linkage_p (tree decl)
1654 /* Unfortunately, import_export_decl has not always been called
1655 before the function is processed, so we cannot simply check
1657 return (DECL_COMDAT (decl)
1658 || (((TREE_CODE (decl) == FUNCTION_DECL
1659 && DECL_DECLARED_INLINE_P (decl))
1660 || (DECL_LANG_SPECIFIC (decl)
1661 && DECL_TEMPLATE_INSTANTIATION (decl)))
1662 && TREE_PUBLIC (decl)));
1665 /* Determine whether or not we want to specifically import or export CTYPE,
1666 using various heuristics. */
1669 import_export_class (tree ctype)
1671 /* -1 for imported, 1 for exported. */
1672 int import_export = 0;
1674 /* It only makes sense to call this function at EOF. The reason is
1675 that this function looks at whether or not the first non-inline
1676 non-abstract virtual member function has been defined in this
1677 translation unit. But, we can't possibly know that until we've
1678 seen the entire translation unit. */
1679 gcc_assert (at_eof);
1681 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1684 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1685 we will have CLASSTYPE_INTERFACE_ONLY set but not
1686 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1687 heuristic because someone will supply a #pragma implementation
1688 elsewhere, and deducing it here would produce a conflict. */
1689 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1692 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1694 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1696 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1697 && !flag_implicit_templates)
1698 /* For a template class, without -fimplicit-templates, check the
1699 repository. If the virtual table is assigned to this
1700 translation unit, then export the class; otherwise, import
1702 import_export = repo_export_class_p (ctype) ? 1 : -1;
1703 else if (TYPE_POLYMORPHIC_P (ctype))
1705 /* The ABI specifies that the virtual table and associated
1706 information are emitted with the key method, if any. */
1707 tree method = CLASSTYPE_KEY_METHOD (ctype);
1708 /* If weak symbol support is not available, then we must be
1709 careful not to emit the vtable when the key function is
1710 inline. An inline function can be defined in multiple
1711 translation units. If we were to emit the vtable in each
1712 translation unit containing a definition, we would get
1713 multiple definition errors at link-time. */
1714 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1715 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1718 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1719 a definition anywhere else. */
1720 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1723 /* Allow back ends the chance to overrule the decision. */
1724 if (targetm.cxx.import_export_class)
1725 import_export = targetm.cxx.import_export_class (ctype, import_export);
1729 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1730 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1734 /* Return true if VAR has already been provided to the back end; in that
1735 case VAR should not be modified further by the front end. */
1737 var_finalized_p (tree var)
1739 return varpool_node (var)->finalized;
1742 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1743 must be emitted in this translation unit. Mark it as such. */
1746 mark_needed (tree decl)
1748 /* It's possible that we no longer need to set
1749 TREE_SYMBOL_REFERENCED here directly, but doing so is
1751 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1752 mark_decl_referenced (decl);
1755 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1756 returns true if a definition of this entity should be provided in
1757 this object file. Callers use this function to determine whether
1758 or not to let the back end know that a definition of DECL is
1759 available in this translation unit. */
1762 decl_needed_p (tree decl)
1764 gcc_assert (TREE_CODE (decl) == VAR_DECL
1765 || TREE_CODE (decl) == FUNCTION_DECL);
1766 /* This function should only be called at the end of the translation
1767 unit. We cannot be sure of whether or not something will be
1768 COMDAT until that point. */
1769 gcc_assert (at_eof);
1771 /* All entities with external linkage that are not COMDAT should be
1772 emitted; they may be referred to from other object files. */
1773 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1775 /* If this entity was used, let the back end see it; it will decide
1776 whether or not to emit it into the object file. */
1777 if (TREE_USED (decl)
1778 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1779 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1781 /* Functions marked "dllexport" must be emitted so that they are
1782 visible to other DLLs. */
1783 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1785 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1786 reference to DECL might cause it to be emitted later. */
1790 /* If necessary, write out the vtables for the dynamic class CTYPE.
1791 Returns true if any vtables were emitted. */
1794 maybe_emit_vtables (tree ctype)
1799 struct varpool_node *current = NULL, *last = NULL, *first = NULL;
1801 /* If the vtables for this class have already been emitted there is
1802 nothing more to do. */
1803 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1804 if (var_finalized_p (primary_vtbl))
1806 /* Ignore dummy vtables made by get_vtable_decl. */
1807 if (TREE_TYPE (primary_vtbl) == void_type_node)
1810 /* On some targets, we cannot determine the key method until the end
1811 of the translation unit -- which is when this function is
1813 if (!targetm.cxx.key_method_may_be_inline ())
1814 determine_key_method (ctype);
1816 /* See if any of the vtables are needed. */
1817 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1819 import_export_decl (vtbl);
1820 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1825 /* If the references to this class' vtables are optimized away,
1826 still emit the appropriate debugging information. See
1828 if (DECL_COMDAT (primary_vtbl)
1829 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1830 note_debug_info_needed (ctype);
1834 /* The ABI requires that we emit all of the vtables if we emit any
1836 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1838 /* Mark entities references from the virtual table as used. */
1839 mark_vtable_entries (vtbl);
1841 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1843 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1845 /* It had better be all done at compile-time. */
1850 DECL_EXTERNAL (vtbl) = 0;
1851 rest_of_decl_compilation (vtbl, 1, 1);
1853 /* Because we're only doing syntax-checking, we'll never end up
1854 actually marking the variable as written. */
1855 if (flag_syntax_only)
1856 TREE_ASM_WRITTEN (vtbl) = 1;
1857 else if (DECL_COMDAT (vtbl))
1859 current = varpool_node (vtbl);
1861 last->same_comdat_group = current;
1869 last->same_comdat_group = first;
1871 /* Since we're writing out the vtable here, also write the debug
1873 note_debug_info_needed (ctype);
1878 /* A special return value from type_visibility meaning internal
1881 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1883 /* walk_tree helper function for type_visibility. */
1886 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1888 int *vis_p = (int *)data;
1893 else if (CLASS_TYPE_P (*tp))
1895 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1897 *vis_p = VISIBILITY_ANON;
1900 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1901 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1906 /* Returns the visibility of TYPE, which is the minimum visibility of its
1910 type_visibility (tree type)
1912 int vis = VISIBILITY_DEFAULT;
1913 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1917 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1918 specified (or if VISIBILITY is static). */
1921 constrain_visibility (tree decl, int visibility)
1923 if (visibility == VISIBILITY_ANON)
1925 /* extern "C" declarations aren't affected by the anonymous
1927 if (!DECL_EXTERN_C_P (decl))
1929 TREE_PUBLIC (decl) = 0;
1930 DECL_WEAK (decl) = 0;
1931 DECL_COMMON (decl) = 0;
1932 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1933 DECL_INTERFACE_KNOWN (decl) = 1;
1934 if (DECL_LANG_SPECIFIC (decl))
1935 DECL_NOT_REALLY_EXTERN (decl) = 1;
1938 else if (visibility > DECL_VISIBILITY (decl)
1939 && !DECL_VISIBILITY_SPECIFIED (decl))
1941 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1947 /* Constrain the visibility of DECL based on the visibility of its template
1951 constrain_visibility_for_template (tree decl, tree targs)
1953 /* If this is a template instantiation, check the innermost
1954 template args for visibility constraints. The outer template
1955 args are covered by the class check. */
1956 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1958 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1962 tree arg = TREE_VEC_ELT (args, i-1);
1964 vis = type_visibility (arg);
1965 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1968 if (TREE_CODE (arg) == ADDR_EXPR)
1969 arg = TREE_OPERAND (arg, 0);
1970 if (TREE_CODE (arg) == VAR_DECL
1971 || TREE_CODE (arg) == FUNCTION_DECL)
1973 if (! TREE_PUBLIC (arg))
1974 vis = VISIBILITY_ANON;
1976 vis = DECL_VISIBILITY (arg);
1980 constrain_visibility (decl, vis);
1984 /* Like c_determine_visibility, but with additional C++-specific
1987 Function-scope entities can rely on the function's visibility because
1988 it is set in start_preparsed_function.
1990 Class-scope entities cannot rely on the class's visibility until the end
1991 of the enclosing class definition.
1993 Note that because namespaces have multiple independent definitions,
1994 namespace visibility is handled elsewhere using the #pragma visibility
1995 machinery rather than by decorating the namespace declaration.
1997 The goal is for constraints from the type to give a diagnostic, and
1998 other constraints to be applied silently. */
2001 determine_visibility (tree decl)
2003 tree class_type = NULL_TREE;
2005 bool orig_visibility_specified;
2006 enum symbol_visibility orig_visibility;
2008 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2010 /* Only relevant for names with external linkage. */
2011 if (!TREE_PUBLIC (decl))
2014 /* Cloned constructors and destructors get the same visibility as
2015 the underlying function. That should be set up in
2016 maybe_clone_body. */
2017 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2019 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2020 orig_visibility = DECL_VISIBILITY (decl);
2022 if (TREE_CODE (decl) == TYPE_DECL)
2024 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2025 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2026 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2031 else if (DECL_LANG_SPECIFIC (decl))
2032 use_template = DECL_USE_TEMPLATE (decl);
2036 /* If DECL is a member of a class, visibility specifiers on the
2037 class can influence the visibility of the DECL. */
2038 if (DECL_CLASS_SCOPE_P (decl))
2039 class_type = DECL_CONTEXT (decl);
2042 /* Not a class member. */
2044 /* Virtual tables have DECL_CONTEXT set to their associated class,
2045 so they are automatically handled above. */
2046 gcc_assert (TREE_CODE (decl) != VAR_DECL
2047 || !DECL_VTABLE_OR_VTT_P (decl));
2049 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2051 /* Local statics and classes get the visibility of their
2052 containing function by default, except that
2053 -fvisibility-inlines-hidden doesn't affect them. */
2054 tree fn = DECL_CONTEXT (decl);
2055 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2057 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2058 DECL_VISIBILITY_SPECIFIED (decl) =
2059 DECL_VISIBILITY_SPECIFIED (fn);
2062 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2064 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2065 but have no TEMPLATE_INFO, so don't try to check it. */
2068 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2069 && flag_visibility_ms_compat)
2071 /* Under -fvisibility-ms-compat, types are visible by default,
2072 even though their contents aren't. */
2073 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2074 int underlying_vis = type_visibility (underlying_type);
2075 if (underlying_vis == VISIBILITY_ANON
2076 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
2077 constrain_visibility (decl, underlying_vis);
2079 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2081 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2083 /* tinfo visibility is based on the type it's for. */
2084 constrain_visibility
2085 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2087 /* Give the target a chance to override the visibility associated
2089 if (TREE_PUBLIC (decl)
2090 && !DECL_REALLY_EXTERN (decl)
2091 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2092 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2093 targetm.cxx.determine_class_data_visibility (decl);
2095 else if (use_template)
2096 /* Template instantiations and specializations get visibility based
2097 on their template unless they override it with an attribute. */;
2098 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2100 /* Set default visibility to whatever the user supplied with
2101 #pragma GCC visibility or a namespace visibility attribute. */
2102 DECL_VISIBILITY (decl) = default_visibility;
2103 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2109 /* If the specialization doesn't specify visibility, use the
2110 visibility from the template. */
2111 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2112 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2113 : DECL_TEMPLATE_INFO (decl));
2114 tree args = TI_ARGS (tinfo);
2116 if (args != error_mark_node)
2118 int depth = TMPL_ARGS_DEPTH (args);
2119 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2121 if (!DECL_VISIBILITY_SPECIFIED (decl))
2123 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2124 DECL_VISIBILITY_SPECIFIED (decl)
2125 = DECL_VISIBILITY_SPECIFIED (pattern);
2128 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2129 if (args && depth > template_class_depth (class_type))
2130 /* Limit visibility based on its template arguments. */
2131 constrain_visibility_for_template (decl, args);
2136 determine_visibility_from_class (decl, class_type);
2138 if (decl_anon_ns_mem_p (decl))
2139 /* Names in an anonymous namespace get internal linkage.
2140 This might change once we implement export. */
2141 constrain_visibility (decl, VISIBILITY_ANON);
2142 else if (TREE_CODE (decl) != TYPE_DECL)
2144 /* Propagate anonymity from type to decl. */
2145 int tvis = type_visibility (TREE_TYPE (decl));
2146 if (tvis == VISIBILITY_ANON
2147 || ! DECL_VISIBILITY_SPECIFIED (decl))
2148 constrain_visibility (decl, tvis);
2150 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2151 /* DR 757: A type without linkage shall not be used as the type of a
2152 variable or function with linkage, unless
2153 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2154 o the variable or function is not used (3.2 [basic.def.odr]) or is
2155 defined in the same translation unit.
2157 Since non-extern "C" decls need to be defined in the same
2158 translation unit, we can make the type internal. */
2159 constrain_visibility (decl, VISIBILITY_ANON);
2161 /* If visibility changed and DECL already has DECL_RTL, ensure
2162 symbol flags are updated. */
2163 if ((DECL_VISIBILITY (decl) != orig_visibility
2164 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2165 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2166 || TREE_CODE (decl) == FUNCTION_DECL)
2167 && DECL_RTL_SET_P (decl))
2168 make_decl_rtl (decl);
2171 /* By default, static data members and function members receive
2172 the visibility of their containing class. */
2175 determine_visibility_from_class (tree decl, tree class_type)
2177 if (DECL_VISIBILITY_SPECIFIED (decl))
2180 if (visibility_options.inlines_hidden
2181 /* Don't do this for inline templates; specializations might not be
2182 inline, and we don't want them to inherit the hidden
2183 visibility. We'll set it here for all inline instantiations. */
2184 && !processing_template_decl
2185 && TREE_CODE (decl) == FUNCTION_DECL
2186 && DECL_DECLARED_INLINE_P (decl)
2187 && (! DECL_LANG_SPECIFIC (decl)
2188 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2189 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2192 /* Default to the class visibility. */
2193 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2194 DECL_VISIBILITY_SPECIFIED (decl)
2195 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2198 /* Give the target a chance to override the visibility associated
2200 if (TREE_CODE (decl) == VAR_DECL
2201 && (DECL_TINFO_P (decl)
2202 || (DECL_VTABLE_OR_VTT_P (decl)
2203 /* Construction virtual tables are not exported because
2204 they cannot be referred to from other object files;
2205 their name is not standardized by the ABI. */
2206 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2207 && TREE_PUBLIC (decl)
2208 && !DECL_REALLY_EXTERN (decl)
2209 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2210 targetm.cxx.determine_class_data_visibility (decl);
2213 /* Constrain the visibility of a class TYPE based on the visibility of its
2214 field types. Warn if any fields require lesser visibility. */
2217 constrain_class_visibility (tree type)
2223 int vis = type_visibility (type);
2225 if (vis == VISIBILITY_ANON
2226 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2229 /* Don't warn about visibility if the class has explicit visibility. */
2230 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2231 vis = VISIBILITY_INTERNAL;
2233 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
2234 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2236 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2237 int subvis = type_visibility (ftype);
2239 if (subvis == VISIBILITY_ANON)
2241 if (!in_main_input_context ())
2243 %qT has a field %qD whose type uses the anonymous namespace",
2246 else if (MAYBE_CLASS_TYPE_P (ftype)
2247 && vis < VISIBILITY_HIDDEN
2248 && subvis >= VISIBILITY_HIDDEN)
2249 warning (OPT_Wattributes, "\
2250 %qT declared with greater visibility than the type of its field %qD",
2254 binfo = TYPE_BINFO (type);
2255 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2257 int subvis = type_visibility (TREE_TYPE (t));
2259 if (subvis == VISIBILITY_ANON)
2261 if (!in_main_input_context())
2263 %qT has a base %qT whose type uses the anonymous namespace",
2264 type, TREE_TYPE (t));
2266 else if (vis < VISIBILITY_HIDDEN
2267 && subvis >= VISIBILITY_HIDDEN)
2268 warning (OPT_Wattributes, "\
2269 %qT declared with greater visibility than its base %qT",
2270 type, TREE_TYPE (t));
2274 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2275 for DECL has not already been determined, do so now by setting
2276 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2277 function is called entities with vague linkage whose definitions
2278 are available must have TREE_PUBLIC set.
2280 If this function decides to place DECL in COMDAT, it will set
2281 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2282 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2283 callers defer that decision until it is clear that DECL is actually
2287 import_export_decl (tree decl)
2292 tree class_type = NULL_TREE;
2294 if (DECL_INTERFACE_KNOWN (decl))
2297 /* We cannot determine what linkage to give to an entity with vague
2298 linkage until the end of the file. For example, a virtual table
2299 for a class will be defined if and only if the key method is
2300 defined in this translation unit. As a further example, consider
2301 that when compiling a translation unit that uses PCH file with
2302 "-frepo" it would be incorrect to make decisions about what
2303 entities to emit when building the PCH; those decisions must be
2304 delayed until the repository information has been processed. */
2305 gcc_assert (at_eof);
2306 /* Object file linkage for explicit instantiations is handled in
2307 mark_decl_instantiated. For static variables in functions with
2308 vague linkage, maybe_commonize_var is used.
2310 Therefore, the only declarations that should be provided to this
2311 function are those with external linkage that are:
2313 * implicit instantiations of function templates
2317 * implicit instantiations of static data members of class
2324 Furthermore, all entities that reach this point must have a
2325 definition available in this translation unit.
2327 The following assertions check these conditions. */
2328 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2329 || TREE_CODE (decl) == VAR_DECL);
2330 /* Any code that creates entities with TREE_PUBLIC cleared should
2331 also set DECL_INTERFACE_KNOWN. */
2332 gcc_assert (TREE_PUBLIC (decl));
2333 if (TREE_CODE (decl) == FUNCTION_DECL)
2334 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2335 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2336 || DECL_DECLARED_INLINE_P (decl));
2338 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2339 || DECL_VTABLE_OR_VTT_P (decl)
2340 || DECL_TINFO_P (decl));
2341 /* Check that a definition of DECL is available in this translation
2343 gcc_assert (!DECL_REALLY_EXTERN (decl));
2345 /* Assume that DECL will not have COMDAT linkage. */
2347 /* Assume that DECL will not be imported into this translation
2351 /* See if the repository tells us whether or not to emit DECL in
2352 this translation unit. */
2353 emit_p = repo_emit_p (decl);
2356 else if (emit_p == 1)
2358 /* The repository indicates that this entity should be defined
2359 here. Make sure the back end honors that request. */
2360 if (TREE_CODE (decl) == VAR_DECL)
2362 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2363 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2366 FOR_EACH_CLONE (clone, decl)
2367 mark_needed (clone);
2371 /* Output the definition as an ordinary strong definition. */
2372 DECL_EXTERNAL (decl) = 0;
2373 DECL_INTERFACE_KNOWN (decl) = 1;
2378 /* We have already decided what to do with this DECL; there is no
2379 need to check anything further. */
2381 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2383 class_type = DECL_CONTEXT (decl);
2384 import_export_class (class_type);
2385 if (TYPE_FOR_JAVA (class_type))
2387 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2388 && CLASSTYPE_INTERFACE_ONLY (class_type))
2390 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2391 && !CLASSTYPE_USE_TEMPLATE (class_type)
2392 && CLASSTYPE_KEY_METHOD (class_type)
2393 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2394 /* The ABI requires that all virtual tables be emitted with
2395 COMDAT linkage. However, on systems where COMDAT symbols
2396 don't show up in the table of contents for a static
2397 archive, or on systems without weak symbols (where we
2398 approximate COMDAT linkage by using internal linkage), the
2399 linker will report errors about undefined symbols because
2400 it will not see the virtual table definition. Therefore,
2401 in the case that we know that the virtual table will be
2402 emitted in only one translation unit, we make the virtual
2403 table an ordinary definition with external linkage. */
2404 DECL_EXTERNAL (decl) = 0;
2405 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2407 /* CLASS_TYPE is being exported from this translation unit,
2408 so DECL should be defined here. */
2409 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2410 /* If a class is declared in a header with the "extern
2411 template" extension, then it will not be instantiated,
2412 even in translation units that would normally require
2413 it. Often such classes are explicitly instantiated in
2414 one translation unit. Therefore, the explicit
2415 instantiation must be made visible to other translation
2417 DECL_EXTERNAL (decl) = 0;
2420 /* The generic C++ ABI says that class data is always
2421 COMDAT, even if there is a key function. Some
2422 variants (e.g., the ARM EABI) says that class data
2423 only has COMDAT linkage if the class data might be
2424 emitted in more than one translation unit. When the
2425 key method can be inline and is inline, we still have
2426 to arrange for comdat even though
2427 class_data_always_comdat is false. */
2428 if (!CLASSTYPE_KEY_METHOD (class_type)
2429 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2430 || targetm.cxx.class_data_always_comdat ())
2432 /* The ABI requires COMDAT linkage. Normally, we
2433 only emit COMDAT things when they are needed;
2434 make sure that we realize that this entity is
2441 else if (!flag_implicit_templates
2442 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2447 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2449 tree type = TREE_TYPE (DECL_NAME (decl));
2450 if (CLASS_TYPE_P (type))
2453 import_export_class (type);
2454 if (CLASSTYPE_INTERFACE_KNOWN (type)
2455 && TYPE_POLYMORPHIC_P (type)
2456 && CLASSTYPE_INTERFACE_ONLY (type)
2457 /* If -fno-rtti was specified, then we cannot be sure
2458 that RTTI information will be emitted with the
2459 virtual table of the class, so we must emit it
2460 wherever it is used. */
2465 if (CLASSTYPE_INTERFACE_KNOWN (type)
2466 && !CLASSTYPE_INTERFACE_ONLY (type))
2468 comdat_p = (targetm.cxx.class_data_always_comdat ()
2469 || (CLASSTYPE_KEY_METHOD (type)
2470 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2475 DECL_EXTERNAL (decl) = 0;
2485 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2486 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2488 /* DECL is an implicit instantiation of a function or static
2490 if ((flag_implicit_templates
2491 && !flag_use_repository)
2492 || (flag_implicit_inline_templates
2493 && TREE_CODE (decl) == FUNCTION_DECL
2494 && DECL_DECLARED_INLINE_P (decl)))
2497 /* If we are not implicitly generating templates, then mark
2498 this entity as undefined in this translation unit. */
2501 else if (DECL_FUNCTION_MEMBER_P (decl))
2503 if (!DECL_DECLARED_INLINE_P (decl))
2505 tree ctype = DECL_CONTEXT (decl);
2506 import_export_class (ctype);
2507 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2509 DECL_NOT_REALLY_EXTERN (decl)
2510 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2511 || (DECL_DECLARED_INLINE_P (decl)
2512 && ! flag_implement_inlines
2513 && !DECL_VINDEX (decl)));
2515 if (!DECL_NOT_REALLY_EXTERN (decl))
2516 DECL_EXTERNAL (decl) = 1;
2518 /* Always make artificials weak. */
2519 if (DECL_ARTIFICIAL (decl) && flag_weak)
2522 maybe_make_one_only (decl);
2533 /* If we are importing DECL into this translation unit, mark is
2534 an undefined here. */
2535 DECL_EXTERNAL (decl) = 1;
2536 DECL_NOT_REALLY_EXTERN (decl) = 0;
2540 /* If we decided to put DECL in COMDAT, mark it accordingly at
2542 comdat_linkage (decl);
2545 DECL_INTERFACE_KNOWN (decl) = 1;
2548 /* Return an expression that performs the destruction of DECL, which
2549 must be a VAR_DECL whose type has a non-trivial destructor, or is
2550 an array whose (innermost) elements have a non-trivial destructor. */
2553 build_cleanup (tree decl)
2556 tree type = TREE_TYPE (decl);
2558 /* This function should only be called for declarations that really
2559 require cleanups. */
2560 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2562 /* Treat all objects with destructors as used; the destructor may do
2563 something substantive. */
2566 if (TREE_CODE (type) == ARRAY_TYPE)
2569 temp = build_address (decl);
2570 temp = build_delete (TREE_TYPE (temp), temp,
2571 sfk_complete_destructor,
2572 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2576 /* Returns the initialization guard variable for the variable DECL,
2577 which has static storage duration. */
2580 get_guard (tree decl)
2585 sname = mangle_guard_variable (decl);
2586 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2591 /* We use a type that is big enough to contain a mutex as well
2592 as an integer counter. */
2593 guard_type = targetm.cxx.guard_type ();
2594 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2595 VAR_DECL, sname, guard_type);
2597 /* The guard should have the same linkage as what it guards. */
2598 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2599 TREE_STATIC (guard) = TREE_STATIC (decl);
2600 DECL_COMMON (guard) = DECL_COMMON (decl);
2601 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2602 if (DECL_ONE_ONLY (decl))
2603 make_decl_one_only (guard, cxx_comdat_group (guard));
2604 if (TREE_PUBLIC (decl))
2605 DECL_WEAK (guard) = DECL_WEAK (decl);
2606 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2607 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2609 DECL_ARTIFICIAL (guard) = 1;
2610 DECL_IGNORED_P (guard) = 1;
2611 TREE_USED (guard) = 1;
2612 pushdecl_top_level_and_finish (guard, NULL_TREE);
2617 /* Return those bits of the GUARD variable that should be set when the
2618 guarded entity is actually initialized. */
2621 get_guard_bits (tree guard)
2623 if (!targetm.cxx.guard_mask_bit ())
2625 /* We only set the first byte of the guard, in order to leave room
2626 for a mutex in the high-order bits. */
2627 guard = build1 (ADDR_EXPR,
2628 build_pointer_type (TREE_TYPE (guard)),
2630 guard = build1 (NOP_EXPR,
2631 build_pointer_type (char_type_node),
2633 guard = build1 (INDIRECT_REF, char_type_node, guard);
2639 /* Return an expression which determines whether or not the GUARD
2640 variable has already been initialized. */
2643 get_guard_cond (tree guard)
2647 /* Check to see if the GUARD is zero. */
2648 guard = get_guard_bits (guard);
2650 /* Mask off all but the low bit. */
2651 if (targetm.cxx.guard_mask_bit ())
2653 guard_value = integer_one_node;
2654 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2655 guard_value = convert (TREE_TYPE (guard), guard_value);
2656 guard = cp_build_binary_op (input_location,
2657 BIT_AND_EXPR, guard, guard_value,
2658 tf_warning_or_error);
2661 guard_value = integer_zero_node;
2662 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2663 guard_value = convert (TREE_TYPE (guard), guard_value);
2664 return cp_build_binary_op (input_location,
2665 EQ_EXPR, guard, guard_value,
2666 tf_warning_or_error);
2669 /* Return an expression which sets the GUARD variable, indicating that
2670 the variable being guarded has been initialized. */
2673 set_guard (tree guard)
2677 /* Set the GUARD to one. */
2678 guard = get_guard_bits (guard);
2679 guard_init = integer_one_node;
2680 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2681 guard_init = convert (TREE_TYPE (guard), guard_init);
2682 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2683 tf_warning_or_error);
2686 /* Start the process of running a particular set of global constructors
2687 or destructors. Subroutine of do_[cd]tors. */
2690 start_objects (int method_type, int initp)
2696 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2698 if (initp != DEFAULT_INIT_PRIORITY)
2708 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2711 sprintf (type, "%c", method_type);
2713 fndecl = build_lang_decl (FUNCTION_DECL,
2714 get_file_function_name (type),
2715 build_function_type_list (void_type_node,
2717 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2719 TREE_PUBLIC (current_function_decl) = 0;
2721 /* Mark as artificial because it's not explicitly in the user's
2723 DECL_ARTIFICIAL (current_function_decl) = 1;
2725 /* Mark this declaration as used to avoid spurious warnings. */
2726 TREE_USED (current_function_decl) = 1;
2728 /* Mark this function as a global constructor or destructor. */
2729 if (method_type == 'I')
2730 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2732 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2734 body = begin_compound_stmt (BCS_FN_BODY);
2739 /* Finish the process of running a particular set of global constructors
2740 or destructors. Subroutine of do_[cd]tors. */
2743 finish_objects (int method_type, int initp, tree body)
2748 finish_compound_stmt (body);
2749 fn = finish_function (0);
2751 if (method_type == 'I')
2753 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2754 decl_init_priority_insert (fn, initp);
2758 DECL_STATIC_DESTRUCTOR (fn) = 1;
2759 decl_fini_priority_insert (fn, initp);
2762 expand_or_defer_fn (fn);
2765 /* The names of the parameters to the function created to handle
2766 initializations and destructions for objects with static storage
2768 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2769 #define PRIORITY_IDENTIFIER "__priority"
2771 /* The name of the function we create to handle initializations and
2772 destructions for objects with static storage duration. */
2773 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2775 /* The declaration for the __INITIALIZE_P argument. */
2776 static GTY(()) tree initialize_p_decl;
2778 /* The declaration for the __PRIORITY argument. */
2779 static GTY(()) tree priority_decl;
2781 /* The declaration for the static storage duration function. */
2782 static GTY(()) tree ssdf_decl;
2784 /* All the static storage duration functions created in this
2785 translation unit. */
2786 static GTY(()) VEC(tree,gc) *ssdf_decls;
2788 /* A map from priority levels to information about that priority
2789 level. There may be many such levels, so efficient lookup is
2791 static splay_tree priority_info_map;
2793 /* Begins the generation of the function that will handle all
2794 initialization and destruction of objects with static storage
2795 duration. The function generated takes two parameters of type
2796 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2797 nonzero, it performs initializations. Otherwise, it performs
2798 destructions. It only performs those initializations or
2799 destructions with the indicated __PRIORITY. The generated function
2802 It is assumed that this function will only be called once per
2803 translation unit. */
2806 start_static_storage_duration_function (unsigned count)
2810 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2812 /* Create the identifier for this function. It will be of the form
2813 SSDF_IDENTIFIER_<number>. */
2814 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2816 type = build_function_type_list (void_type_node,
2817 integer_type_node, integer_type_node,
2820 /* Create the FUNCTION_DECL itself. */
2821 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2822 get_identifier (id),
2824 TREE_PUBLIC (ssdf_decl) = 0;
2825 DECL_ARTIFICIAL (ssdf_decl) = 1;
2827 /* Put this function in the list of functions to be called from the
2828 static constructors and destructors. */
2831 ssdf_decls = VEC_alloc (tree, gc, 32);
2833 /* Take this opportunity to initialize the map from priority
2834 numbers to information about that priority level. */
2835 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2836 /*delete_key_fn=*/0,
2837 /*delete_value_fn=*/
2838 (splay_tree_delete_value_fn) &free);
2840 /* We always need to generate functions for the
2841 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2842 priorities later, we'll be sure to find the
2843 DEFAULT_INIT_PRIORITY. */
2844 get_priority_info (DEFAULT_INIT_PRIORITY);
2847 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2849 /* Create the argument list. */
2850 initialize_p_decl = cp_build_parm_decl
2851 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2852 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2853 TREE_USED (initialize_p_decl) = 1;
2854 priority_decl = cp_build_parm_decl
2855 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2856 DECL_CONTEXT (priority_decl) = ssdf_decl;
2857 TREE_USED (priority_decl) = 1;
2859 DECL_CHAIN (initialize_p_decl) = priority_decl;
2860 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2862 /* Put the function in the global scope. */
2863 pushdecl (ssdf_decl);
2865 /* Start the function itself. This is equivalent to declaring the
2868 static void __ssdf (int __initialize_p, init __priority_p);
2870 It is static because we only need to call this function from the
2871 various constructor and destructor functions for this module. */
2872 start_preparsed_function (ssdf_decl,
2873 /*attrs=*/NULL_TREE,
2876 /* Set up the scope of the outermost block in the function. */
2877 body = begin_compound_stmt (BCS_FN_BODY);
2882 /* Finish the generation of the function which performs initialization
2883 and destruction of objects with static storage duration. After
2884 this point, no more such objects can be created. */
2887 finish_static_storage_duration_function (tree body)
2889 /* Close out the function. */
2890 finish_compound_stmt (body);
2891 expand_or_defer_fn (finish_function (0));
2894 /* Return the information about the indicated PRIORITY level. If no
2895 code to handle this level has yet been generated, generate the
2896 appropriate prologue. */
2898 static priority_info
2899 get_priority_info (int priority)
2904 n = splay_tree_lookup (priority_info_map,
2905 (splay_tree_key) priority);
2908 /* Create a new priority information structure, and insert it
2910 pi = XNEW (struct priority_info_s);
2911 pi->initializations_p = 0;
2912 pi->destructions_p = 0;
2913 splay_tree_insert (priority_info_map,
2914 (splay_tree_key) priority,
2915 (splay_tree_value) pi);
2918 pi = (priority_info) n->value;
2923 /* The effective initialization priority of a DECL. */
2925 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2926 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2927 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2929 /* Whether a DECL needs a guard to protect it against multiple
2932 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2933 || DECL_ONE_ONLY (decl) \
2934 || DECL_WEAK (decl)))
2936 /* Called from one_static_initialization_or_destruction(),
2938 Walks the initializer list of a global variable and looks for
2939 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2940 and that have their DECL_CONTEXT() == NULL.
2941 For each such temporary variable, set their DECL_CONTEXT() to
2942 the current function. This is necessary because otherwise
2943 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2944 when trying to refer to a temporary variable that does not have
2945 it's DECL_CONTECT() properly set. */
2947 fix_temporary_vars_context_r (tree *node,
2948 int *unused ATTRIBUTE_UNUSED,
2949 void *unused1 ATTRIBUTE_UNUSED)
2951 gcc_assert (current_function_decl);
2953 if (TREE_CODE (*node) == BIND_EXPR)
2957 for (var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var))
2958 if (TREE_CODE (var) == VAR_DECL
2960 && DECL_ARTIFICIAL (var)
2961 && !DECL_CONTEXT (var))
2962 DECL_CONTEXT (var) = current_function_decl;
2968 /* Set up to handle the initialization or destruction of DECL. If
2969 INITP is nonzero, we are initializing the variable. Otherwise, we
2970 are destroying it. */
2973 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2975 tree guard_if_stmt = NULL_TREE;
2978 /* If we are supposed to destruct and there's a trivial destructor,
2979 nothing has to be done. */
2981 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2984 /* Trick the compiler into thinking we are at the file and line
2985 where DECL was declared so that error-messages make sense, and so
2986 that the debugger will show somewhat sensible file and line
2988 input_location = DECL_SOURCE_LOCATION (decl);
2990 /* Make sure temporary variables in the initialiser all have
2991 their DECL_CONTEXT() set to a value different from NULL_TREE.
2992 This can happen when global variables initialisers are built.
2993 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2994 the temporary variables that might have been generated in the
2995 accompagning initialisers is NULL_TREE, meaning the variables have been
2996 declared in the global namespace.
2997 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2998 of the temporaries are set to the current function decl. */
2999 cp_walk_tree_without_duplicates (&init,
3000 fix_temporary_vars_context_r,
3007 Access control for implicit calls to the constructors,
3008 the conversion functions, or the destructor called to
3009 create and destroy a static data member is performed as
3010 if these calls appeared in the scope of the member's
3013 we pretend we are in a static member function of the class of
3014 which the DECL is a member. */
3015 if (member_p (decl))
3017 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3018 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3021 /* Assume we don't need a guard. */
3023 /* We need a guard if this is an object with external linkage that
3024 might be initialized in more than one place. (For example, a
3025 static data member of a template, when the data member requires
3027 if (NEEDS_GUARD_P (decl))
3031 guard = get_guard (decl);
3033 /* When using __cxa_atexit, we just check the GUARD as we would
3034 for a local static. */
3035 if (flag_use_cxa_atexit)
3037 /* When using __cxa_atexit, we never try to destroy
3038 anything from a static destructor. */
3040 guard_cond = get_guard_cond (guard);
3042 /* If we don't have __cxa_atexit, then we will be running
3043 destructors from .fini sections, or their equivalents. So,
3044 we need to know how many times we've tried to initialize this
3045 object. We do initializations only if the GUARD is zero,
3046 i.e., if we are the first to initialize the variable. We do
3047 destructions only if the GUARD is one, i.e., if we are the
3048 last to destroy the variable. */
3051 = cp_build_binary_op (input_location,
3053 cp_build_unary_op (PREINCREMENT_EXPR,
3056 tf_warning_or_error),
3058 tf_warning_or_error);
3061 = cp_build_binary_op (input_location,
3063 cp_build_unary_op (PREDECREMENT_EXPR,
3066 tf_warning_or_error),
3068 tf_warning_or_error);
3070 guard_if_stmt = begin_if_stmt ();
3071 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3075 /* If we're using __cxa_atexit, we have not already set the GUARD,
3076 so we must do so now. */
3077 if (guard && initp && flag_use_cxa_atexit)
3078 finish_expr_stmt (set_guard (guard));
3080 /* Perform the initialization or destruction. */
3084 finish_expr_stmt (init);
3086 /* If we're using __cxa_atexit, register a function that calls the
3087 destructor for the object. */
3088 if (flag_use_cxa_atexit)
3089 finish_expr_stmt (register_dtor_fn (decl));
3092 finish_expr_stmt (build_cleanup (decl));
3094 /* Finish the guard if-stmt, if necessary. */
3097 finish_then_clause (guard_if_stmt);
3098 finish_if_stmt (guard_if_stmt);
3101 /* Now that we're done with DECL we don't need to pretend to be a
3102 member of its class any longer. */
3103 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3104 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3107 /* Generate code to do the initialization or destruction of the decls in VARS,
3108 a TREE_LIST of VAR_DECL with static storage duration.
3109 Whether initialization or destruction is performed is specified by INITP. */
3112 do_static_initialization_or_destruction (tree vars, bool initp)
3114 tree node, init_if_stmt, cond;
3116 /* Build the outer if-stmt to check for initialization or destruction. */
3117 init_if_stmt = begin_if_stmt ();
3118 cond = initp ? integer_one_node : integer_zero_node;
3119 cond = cp_build_binary_op (input_location,
3123 tf_warning_or_error);
3124 finish_if_stmt_cond (cond, init_if_stmt);
3128 tree decl = TREE_VALUE (node);
3129 tree priority_if_stmt;
3133 /* If we don't need a destructor, there's nothing to do. Avoid
3134 creating a possibly empty if-stmt. */
3135 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3137 node = TREE_CHAIN (node);
3141 /* Remember that we had an initialization or finalization at this
3143 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3144 pi = get_priority_info (priority);
3146 pi->initializations_p = 1;
3148 pi->destructions_p = 1;
3150 /* Conditionalize this initialization on being in the right priority
3151 and being initializing/finalizing appropriately. */
3152 priority_if_stmt = begin_if_stmt ();
3153 cond = cp_build_binary_op (input_location,
3156 build_int_cst (NULL_TREE, priority),
3157 tf_warning_or_error);
3158 finish_if_stmt_cond (cond, priority_if_stmt);
3160 /* Process initializers with same priority. */
3162 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3163 node = TREE_CHAIN (node))
3164 /* Do one initialization or destruction. */
3165 one_static_initialization_or_destruction (TREE_VALUE (node),
3166 TREE_PURPOSE (node), initp);
3168 /* Finish up the priority if-stmt body. */
3169 finish_then_clause (priority_if_stmt);
3170 finish_if_stmt (priority_if_stmt);
3174 /* Finish up the init/destruct if-stmt body. */
3175 finish_then_clause (init_if_stmt);
3176 finish_if_stmt (init_if_stmt);
3179 /* VARS is a list of variables with static storage duration which may
3180 need initialization and/or finalization. Remove those variables
3181 that don't really need to be initialized or finalized, and return
3182 the resulting list. The order in which the variables appear in
3183 VARS is in reverse order of the order in which they should actually
3184 be initialized. The list we return is in the unreversed order;
3185 i.e., the first variable should be initialized first. */
3188 prune_vars_needing_no_initialization (tree *vars)
3191 tree result = NULL_TREE;
3196 tree decl = TREE_VALUE (t);
3197 tree init = TREE_PURPOSE (t);
3199 /* Deal gracefully with error. */
3200 if (decl == error_mark_node)
3202 var = &TREE_CHAIN (t);
3206 /* The only things that can be initialized are variables. */
3207 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3209 /* If this object is not defined, we don't need to do anything
3211 if (DECL_EXTERNAL (decl))
3213 var = &TREE_CHAIN (t);
3217 /* Also, if the initializer already contains errors, we can bail
3219 if (init && TREE_CODE (init) == TREE_LIST
3220 && value_member (error_mark_node, init))
3222 var = &TREE_CHAIN (t);
3226 /* This variable is going to need initialization and/or
3227 finalization, so we add it to the list. */
3228 *var = TREE_CHAIN (t);
3229 TREE_CHAIN (t) = result;
3236 /* Make sure we have told the back end about all the variables in
3240 write_out_vars (tree vars)
3244 for (v = vars; v; v = TREE_CHAIN (v))
3246 tree var = TREE_VALUE (v);
3247 if (!var_finalized_p (var))
3249 import_export_decl (var);
3250 rest_of_decl_compilation (var, 1, 1);
3255 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3256 (otherwise) that will initialize all global objects with static
3257 storage duration having the indicated PRIORITY. */
3260 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3268 input_location = *locus;
3270 /* Was: locus->line++; */
3272 /* We use `I' to indicate initialization and `D' to indicate
3274 function_key = constructor_p ? 'I' : 'D';
3276 /* We emit the function lazily, to avoid generating empty
3277 global constructors and destructors. */
3280 /* For Objective-C++, we may need to initialize metadata found in this module.
3281 This must be done _before_ any other static initializations. */
3282 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3283 && constructor_p && objc_static_init_needed_p ())
3285 body = start_objects (function_key, priority);
3286 objc_generate_static_init_call (NULL_TREE);
3289 /* Call the static storage duration function with appropriate
3291 FOR_EACH_VEC_ELT (tree, ssdf_decls, i, fndecl)
3293 /* Calls to pure or const functions will expand to nothing. */
3294 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3299 body = start_objects (function_key, priority);
3301 call = cp_build_function_call_nary (fndecl, tf_warning_or_error,
3302 build_int_cst (NULL_TREE,
3304 build_int_cst (NULL_TREE,
3307 finish_expr_stmt (call);
3311 /* Close out the function. */
3313 finish_objects (function_key, priority, body);
3316 /* Generate constructor and destructor functions for the priority
3320 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3322 location_t *locus = (location_t *) data;
3323 int priority = (int) n->key;
3324 priority_info pi = (priority_info) n->value;
3326 /* Generate the functions themselves, but only if they are really
3328 if (pi->initializations_p)
3329 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3330 if (pi->destructions_p)
3331 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3333 /* Keep iterating. */
3337 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3338 decls referenced from front-end specific constructs; it will be called
3339 only for language-specific tree nodes.
3341 Here we must deal with member pointers. */
3344 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3348 switch (TREE_CODE (t))
3351 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3352 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3355 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3356 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3359 if (DECL_CONTEXT (t)
3360 && flag_use_repository
3361 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3362 /* If we need a static variable in a function, then we
3363 need the containing function. */
3364 mark_decl_referenced (DECL_CONTEXT (t));
3373 /* Java requires that we be able to reference a local address for a
3374 method, and not be confused by PLT entries. If hidden aliases are
3375 supported, collect and return all the functions for which we should
3376 emit a hidden alias. */
3378 static struct pointer_set_t *
3379 collect_candidates_for_java_method_aliases (void)
3381 struct cgraph_node *node;
3382 struct pointer_set_t *candidates = NULL;
3384 #ifndef HAVE_GAS_HIDDEN
3388 for (node = cgraph_nodes; node ; node = node->next)
3390 tree fndecl = node->decl;
3392 if (DECL_CONTEXT (fndecl)
3393 && TYPE_P (DECL_CONTEXT (fndecl))
3394 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3395 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3397 if (candidates == NULL)
3398 candidates = pointer_set_create ();
3399 pointer_set_insert (candidates, fndecl);
3407 /* Java requires that we be able to reference a local address for a
3408 method, and not be confused by PLT entries. If hidden aliases are
3409 supported, emit one for each java function that we've emitted.
3410 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3411 by collect_candidates_for_java_method_aliases. */
3414 build_java_method_aliases (struct pointer_set_t *candidates)
3416 struct cgraph_node *node;
3418 #ifndef HAVE_GAS_HIDDEN
3422 for (node = cgraph_nodes; node ; node = node->next)
3424 tree fndecl = node->decl;
3426 if (TREE_ASM_WRITTEN (fndecl)
3427 && pointer_set_contains (candidates, fndecl))
3429 /* Mangle the name in a predictable way; we need to reference
3430 this from a java compiled object file. */
3431 tree oid, nid, alias;
3435 oid = DECL_ASSEMBLER_NAME (fndecl);
3436 oname = IDENTIFIER_POINTER (oid);
3437 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3438 nname = ACONCAT (("_ZGA", oname+2, NULL));
3439 nid = get_identifier (nname);
3441 alias = make_alias_for (fndecl, nid);
3442 TREE_PUBLIC (alias) = 1;
3443 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3445 assemble_alias (alias, oid);
3450 /* Return C++ property of T, based on given operation OP. */
3453 cpp_check (tree t, cpp_operation op)
3458 return DECL_PURE_VIRTUAL_P (t);
3459 case IS_CONSTRUCTOR:
3460 return DECL_CONSTRUCTOR_P (t);
3462 return DECL_DESTRUCTOR_P (t);
3463 case IS_COPY_CONSTRUCTOR:
3464 return DECL_COPY_CONSTRUCTOR_P (t);
3466 return TREE_CODE (t) == TEMPLATE_DECL;
3472 /* Collect source file references recursively, starting from NAMESPC. */
3475 collect_source_refs (tree namespc)
3482 /* Iterate over names in this name space. */
3483 for (t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
3484 if (!DECL_IS_BUILTIN (t) )
3485 collect_source_ref (DECL_SOURCE_FILE (t));
3487 /* Dump siblings, if any */
3488 collect_source_refs (TREE_CHAIN (namespc));
3490 /* Dump children, if any */
3491 collect_source_refs (NAMESPACE_LEVEL (namespc)->namespaces);
3494 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
3495 starting from NAMESPC. */
3498 collect_ada_namespace (tree namespc, const char *source_file)
3503 /* Collect decls from this namespace */
3504 collect_ada_nodes (NAMESPACE_LEVEL (namespc)->names, source_file);
3506 /* Collect siblings, if any */
3507 collect_ada_namespace (TREE_CHAIN (namespc), source_file);
3509 /* Collect children, if any */
3510 collect_ada_namespace (NAMESPACE_LEVEL (namespc)->namespaces, source_file);
3513 /* Returns true iff there is a definition available for variable or
3517 decl_defined_p (tree decl)
3519 if (TREE_CODE (decl) == FUNCTION_DECL)
3520 return (DECL_INITIAL (decl) != NULL_TREE);
3523 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3524 return !DECL_EXTERNAL (decl);
3528 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
3532 An integral constant-expression can only involve ... const
3533 variables of integral or enumeration types initialized with
3534 constant expressions ...
3536 C++0x also allows constexpr variables and temporaries initialized
3537 with constant expressions. We handle the former here, but the latter
3538 are just folded away in cxx_eval_constant_expression.
3540 The standard does not require that the expression be non-volatile.
3541 G++ implements the proposed correction in DR 457. */
3544 decl_constant_var_p (tree decl)
3547 tree type = TREE_TYPE (decl);
3548 if (TREE_CODE (decl) != VAR_DECL)
3550 if (DECL_DECLARED_CONSTEXPR_P (decl))
3552 else if (CP_TYPE_CONST_NON_VOLATILE_P (type)
3553 && INTEGRAL_OR_ENUMERATION_TYPE_P (type))
3555 /* We don't know if a template static data member is initialized with
3556 a constant expression until we instantiate its initializer. */
3558 ret = DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl);
3563 gcc_assert (!ret || DECL_INITIAL (decl));
3567 /* Returns true if DECL could be a symbolic constant variable, depending on
3571 decl_maybe_constant_var_p (tree decl)
3573 tree type = TREE_TYPE (decl);
3574 if (TREE_CODE (decl) != VAR_DECL)
3576 if (DECL_DECLARED_CONSTEXPR_P (decl))
3578 return (CP_TYPE_CONST_NON_VOLATILE_P (type)
3579 && INTEGRAL_OR_ENUMERATION_TYPE_P (type));
3582 /* Complain that DECL uses a type with no linkage but is never defined. */
3585 no_linkage_error (tree decl)
3587 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3588 if (TYPE_ANONYMOUS_P (t))
3590 permerror (0, "%q+#D, declared using anonymous type, "
3591 "is used but never defined", decl);
3592 if (is_typedef_decl (TYPE_NAME (t)))
3593 permerror (0, "%q+#D does not refer to the unqualified type, "
3594 "so it is not used for linkage", TYPE_NAME (t));
3597 permerror (0, "%q+#D, declared using local type %qT, "
3598 "is used but never defined", decl, t);
3601 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
3604 collect_all_refs (const char *source_file)
3606 collect_ada_namespace (global_namespace, source_file);
3609 /* This routine is called at the end of compilation.
3610 Its job is to create all the code needed to initialize and
3611 destroy the global aggregates. We do the destruction
3612 first, since that way we only need to reverse the decls once. */
3615 cp_write_global_declarations (void)
3621 unsigned ssdf_count = 0;
3624 struct pointer_set_t *candidates;
3626 locus = input_location;
3629 /* Bad parse errors. Just forget about it. */
3630 if (! global_bindings_p () || current_class_type
3631 || !VEC_empty (tree,decl_namespace_list))
3635 c_common_write_pch ();
3637 /* Handle -fdump-ada-spec[-slim] */
3638 if (dump_enabled_p (TDI_ada))
3640 if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM)
3641 collect_source_ref (main_input_filename);
3643 collect_source_refs (global_namespace);
3645 dump_ada_specs (collect_all_refs, cpp_check);
3648 /* FIXME - huh? was input_line -= 1;*/
3650 /* We now have to write out all the stuff we put off writing out.
3653 o Template specializations that we have not yet instantiated,
3654 but which are needed.
3655 o Initialization and destruction for non-local objects with
3656 static storage duration. (Local objects with static storage
3657 duration are initialized when their scope is first entered,
3658 and are cleaned up via atexit.)
3659 o Virtual function tables.
3661 All of these may cause others to be needed. For example,
3662 instantiating one function may cause another to be needed, and
3663 generating the initializer for an object may cause templates to be
3664 instantiated, etc., etc. */
3666 timevar_push (TV_VARCONST);
3668 emit_support_tinfos ();
3677 /* If there are templates that we've put off instantiating, do
3679 instantiate_pending_templates (retries);
3682 /* Write out virtual tables as required. Note that writing out
3683 the virtual table for a template class may cause the
3684 instantiation of members of that class. If we write out
3685 vtables then we remove the class from our list so we don't
3686 have to look at it again. */
3688 while (keyed_classes != NULL_TREE
3689 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3692 keyed_classes = TREE_CHAIN (keyed_classes);
3698 tree next = TREE_CHAIN (t);
3702 if (maybe_emit_vtables (TREE_VALUE (next)))
3705 TREE_CHAIN (t) = TREE_CHAIN (next);
3710 next = TREE_CHAIN (t);
3714 /* Write out needed type info variables. We have to be careful
3715 looping through unemitted decls, because emit_tinfo_decl may
3716 cause other variables to be needed. New elements will be
3717 appended, and we remove from the vector those that actually
3719 for (i = VEC_length (tree, unemitted_tinfo_decls);
3720 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3721 if (emit_tinfo_decl (t))
3724 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3727 /* The list of objects with static storage duration is built up
3728 in reverse order. We clear STATIC_AGGREGATES so that any new
3729 aggregates added during the initialization of these will be
3730 initialized in the correct order when we next come around the
3732 vars = prune_vars_needing_no_initialization (&static_aggregates);
3736 /* We need to start a new initialization function each time
3737 through the loop. That's because we need to know which
3738 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3739 isn't computed until a function is finished, and written
3740 out. That's a deficiency in the back end. When this is
3741 fixed, these initialization functions could all become
3742 inline, with resulting performance improvements. */
3745 /* Set the line and file, so that it is obviously not from
3747 input_location = locus;
3748 ssdf_body = start_static_storage_duration_function (ssdf_count);
3750 /* Make sure the back end knows about all the variables. */
3751 write_out_vars (vars);
3753 /* First generate code to do all the initializations. */
3755 do_static_initialization_or_destruction (vars, /*initp=*/true);
3757 /* Then, generate code to do all the destructions. Do these
3758 in reverse order so that the most recently constructed
3759 variable is the first destroyed. If we're using
3760 __cxa_atexit, then we don't need to do this; functions
3761 were registered at initialization time to destroy the
3763 if (!flag_use_cxa_atexit && vars)
3765 vars = nreverse (vars);
3766 do_static_initialization_or_destruction (vars, /*initp=*/false);
3771 /* Finish up the static storage duration function for this
3773 input_location = locus;
3774 finish_static_storage_duration_function (ssdf_body);
3776 /* All those initializations and finalizations might cause
3777 us to need more inline functions, more template
3778 instantiations, etc. */
3781 /* ??? was: locus.line++; */
3784 /* Go through the set of inline functions whose bodies have not
3785 been emitted yet. If out-of-line copies of these functions
3786 are required, emit them. */
3787 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3789 /* Does it need synthesizing? */
3790 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3791 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3793 /* Even though we're already at the top-level, we push
3794 there again. That way, when we pop back a few lines
3795 hence, all of our state is restored. Otherwise,
3796 finish_function doesn't clean things up, and we end
3797 up with CURRENT_FUNCTION_DECL set. */
3798 push_to_top_level ();
3799 /* The decl's location will mark where it was first
3800 needed. Save that so synthesize method can indicate
3801 where it was needed from, in case of error */
3802 input_location = DECL_SOURCE_LOCATION (decl);
3803 synthesize_method (decl);
3804 pop_from_top_level ();
3808 if (!DECL_SAVED_TREE (decl))
3811 /* We lie to the back end, pretending that some functions
3812 are not defined when they really are. This keeps these
3813 functions from being put out unnecessarily. But, we must
3814 stop lying when the functions are referenced, or if they
3815 are not comdat since they need to be put out now. If
3816 DECL_INTERFACE_KNOWN, then we have already set
3817 DECL_EXTERNAL appropriately, so there's no need to check
3818 again, and we do not want to clear DECL_EXTERNAL if a
3819 previous call to import_export_decl set it.
3821 This is done in a separate for cycle, because if some
3822 deferred function is contained in another deferred
3823 function later in deferred_fns varray,
3824 rest_of_compilation would skip this function and we
3825 really cannot expand the same function twice. */
3826 import_export_decl (decl);
3827 if (DECL_NOT_REALLY_EXTERN (decl)
3828 && DECL_INITIAL (decl)
3829 && decl_needed_p (decl))
3831 struct cgraph_node *node = cgraph_get_node (decl), *alias, *next;
3833 DECL_EXTERNAL (decl) = 0;
3834 /* If we mark !DECL_EXTERNAL one of the same body aliases,
3835 we need to mark all of them that way. */
3836 if (node && node->same_body)
3838 DECL_EXTERNAL (node->decl) = 0;
3839 for (alias = node->same_body; alias; alias = alias->next)
3840 DECL_EXTERNAL (alias->decl) = 0;
3842 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3843 group, we need to mark all symbols in the same comdat group
3845 if (node->same_comdat_group)
3846 for (next = node->same_comdat_group;
3848 next = next->same_comdat_group)
3850 DECL_EXTERNAL (next->decl) = 0;
3851 if (next->same_body)
3853 for (alias = next->same_body;
3855 alias = alias->next)
3856 DECL_EXTERNAL (alias->decl) = 0;
3861 /* If we're going to need to write this function out, and
3862 there's already a body for it, create RTL for it now.
3863 (There might be no body if this is a method we haven't
3864 gotten around to synthesizing yet.) */
3865 if (!DECL_EXTERNAL (decl)
3866 && decl_needed_p (decl)
3867 && !TREE_ASM_WRITTEN (decl)
3868 && !cgraph_node (decl)->local.finalized)
3870 /* We will output the function; no longer consider it in this
3872 DECL_DEFER_OUTPUT (decl) = 0;
3873 /* Generate RTL for this function now that we know we
3875 expand_or_defer_fn (decl);
3876 /* If we're compiling -fsyntax-only pretend that this
3877 function has been written out so that we don't try to
3879 if (flag_syntax_only)
3880 TREE_ASM_WRITTEN (decl) = 1;
3885 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3888 /* Static data members are just like namespace-scope globals. */
3889 FOR_EACH_VEC_ELT (tree, pending_statics, i, decl)
3891 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3892 /* Don't write it out if we haven't seen a definition. */
3893 || DECL_IN_AGGR_P (decl))
3895 import_export_decl (decl);
3896 /* If this static data member is needed, provide it to the
3898 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3899 DECL_EXTERNAL (decl) = 0;
3901 if (VEC_length (tree, pending_statics) != 0
3902 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3903 VEC_length (tree, pending_statics)))
3910 /* All used inline functions must have a definition at this point. */
3911 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3913 if (/* Check online inline functions that were actually used. */
3914 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3915 /* If the definition actually was available here, then the
3916 fact that the function was not defined merely represents
3917 that for some reason (use of a template repository,
3918 #pragma interface, etc.) we decided not to emit the
3920 && !DECL_INITIAL (decl)
3921 /* An explicit instantiation can be used to specify
3922 that the body is in another unit. It will have
3923 already verified there was a definition. */
3924 && !DECL_EXPLICIT_INSTANTIATION (decl))
3926 warning (0, "inline function %q+D used but never defined", decl);
3927 /* Avoid a duplicate warning from check_global_declaration_1. */
3928 TREE_NO_WARNING (decl) = 1;
3932 /* So must decls that use a type with no linkage. */
3933 FOR_EACH_VEC_ELT (tree, no_linkage_decls, i, decl)
3934 if (!decl_defined_p (decl))
3935 no_linkage_error (decl);
3937 /* Then, do the Objective-C stuff. This is where all the
3938 Objective-C module stuff gets generated (symtab,
3939 class/protocol/selector lists etc). This must be done after C++
3940 templates, destructors etc. so that selectors used in C++
3941 templates are properly allocated. */
3942 if (c_dialect_objc ())
3943 objc_write_global_declarations ();
3945 /* We give C linkage to static constructors and destructors. */
3946 push_lang_context (lang_name_c);
3948 /* Generate initialization and destruction functions for all
3949 priorities for which they are required. */
3950 if (priority_info_map)
3951 splay_tree_foreach (priority_info_map,
3952 generate_ctor_and_dtor_functions_for_priority,
3954 else if (c_dialect_objc () && objc_static_init_needed_p ())
3955 /* If this is obj-c++ and we need a static init, call
3956 generate_ctor_or_dtor_function. */
3957 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3958 DEFAULT_INIT_PRIORITY, &locus);
3960 /* We're done with the splay-tree now. */
3961 if (priority_info_map)
3962 splay_tree_delete (priority_info_map);
3964 /* Generate any missing aliases. */
3965 maybe_apply_pending_pragma_weaks ();
3967 /* We're done with static constructors, so we can go back to "C++"
3969 pop_lang_context ();
3971 /* Collect candidates for Java hidden aliases. */
3972 candidates = collect_candidates_for_java_method_aliases ();
3974 cgraph_finalize_compilation_unit ();
3976 /* Now, issue warnings about static, but not defined, functions,
3977 etc., and emit debugging information. */
3978 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3979 if (VEC_length (tree, pending_statics) != 0)
3981 check_global_declarations (VEC_address (tree, pending_statics),
3982 VEC_length (tree, pending_statics));
3983 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3984 VEC_length (tree, pending_statics));
3987 perform_deferred_noexcept_checks ();
3989 /* Generate hidden aliases for Java. */
3992 build_java_method_aliases (candidates);
3993 pointer_set_destroy (candidates);
3998 /* The entire file is now complete. If requested, dump everything
4002 FILE *stream = dump_begin (TDI_tu, &flags);
4006 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
4007 dump_end (TDI_tu, stream);
4011 timevar_pop (TV_VARCONST);
4013 if (flag_detailed_statistics)
4015 dump_tree_statistics ();
4016 dump_time_statistics ();
4018 input_location = locus;
4020 #ifdef ENABLE_CHECKING
4021 validate_conversion_obstack ();
4022 #endif /* ENABLE_CHECKING */
4025 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4026 function to call in parse-tree form; it has not yet been
4027 semantically analyzed. ARGS are the arguments to the function.
4028 They have already been semantically analyzed. This may change
4032 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
4035 VEC(tree,gc) *orig_args = NULL;
4040 object = TREE_OPERAND (fn, 0);
4042 if (processing_template_decl)
4044 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
4045 || TREE_CODE (fn) == MEMBER_REF);
4046 if (type_dependent_expression_p (fn)
4047 || any_type_dependent_arguments_p (*args))
4048 return build_nt_call_vec (fn, *args);
4050 orig_args = make_tree_vector_copy (*args);
4052 /* Transform the arguments and add the implicit "this"
4053 parameter. That must be done before the FN is transformed
4054 because we depend on the form of FN. */
4055 make_args_non_dependent (*args);
4056 object = build_non_dependent_expr (object);
4057 if (TREE_CODE (fn) == DOTSTAR_EXPR)
4058 object = cp_build_addr_expr (object, tf_warning_or_error);
4059 VEC_safe_insert (tree, gc, *args, 0, object);
4060 /* Now that the arguments are done, transform FN. */
4061 fn = build_non_dependent_expr (fn);
4064 /* A qualified name corresponding to a bound pointer-to-member is
4065 represented as an OFFSET_REF:
4067 struct B { void g(); };
4069 void B::g() { (this->*p)(); } */
4070 if (TREE_CODE (fn) == OFFSET_REF)
4072 tree object_addr = cp_build_addr_expr (object, tf_warning_or_error);
4073 fn = TREE_OPERAND (fn, 1);
4074 fn = get_member_function_from_ptrfunc (&object_addr, fn);
4075 VEC_safe_insert (tree, gc, *args, 0, object_addr);
4078 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
4079 if (processing_template_decl && expr != error_mark_node)
4080 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
4082 if (orig_args != NULL)
4083 release_tree_vector (orig_args);
4090 check_default_args (tree x)
4092 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
4093 bool saw_def = false;
4094 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
4095 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
4097 if (TREE_PURPOSE (arg))
4101 error ("default argument missing for parameter %P of %q+#D", i, x);
4102 TREE_PURPOSE (arg) = error_mark_node;
4107 /* Return true if function DECL can be inlined. This is used to force
4108 instantiation of methods that might be interesting for inlining. */
4110 possibly_inlined_p (tree decl)
4112 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
4113 if (DECL_UNINLINABLE (decl))
4115 if (!optimize || pragma_java_exceptions)
4116 return DECL_DECLARED_INLINE_P (decl);
4117 /* When optimizing, we might inline everything when flatten
4118 attribute or heuristics inlining for size or autoinlining
4123 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4124 If DECL is a specialization or implicitly declared class member,
4125 generate the actual definition. */
4128 mark_used (tree decl)
4130 /* If DECL is a BASELINK for a single function, then treat it just
4131 like the DECL for the function. Otherwise, if the BASELINK is
4132 for an overloaded function, we don't know which function was
4133 actually used until after overload resolution. */
4134 if (TREE_CODE (decl) == BASELINK)
4136 decl = BASELINK_FUNCTIONS (decl);
4137 if (really_overloaded_fn (decl))
4139 decl = OVL_CURRENT (decl);
4142 /* Set TREE_USED for the benefit of -Wunused. */
4143 TREE_USED (decl) = 1;
4144 if (DECL_CLONED_FUNCTION_P (decl))
4145 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4147 if (TREE_CODE (decl) == FUNCTION_DECL
4148 && DECL_DELETED_FN (decl))
4150 if (DECL_ARTIFICIAL (decl))
4152 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
4153 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
4155 /* We mark a lambda conversion op as deleted if we can't
4156 generate it properly; see maybe_add_lambda_conv_op. */
4157 sorry ("converting lambda which uses %<...%> to "
4158 "function pointer");
4162 error ("use of deleted function %qD", decl);
4163 if (!maybe_explain_implicit_delete (decl))
4164 error_at (DECL_SOURCE_LOCATION (decl), "declared here");
4168 /* We can only check DECL_ODR_USED on variables or functions with
4169 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4170 might need special handling for. */
4171 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4172 || DECL_LANG_SPECIFIC (decl) == NULL
4173 || DECL_THUNK_P (decl))
4176 /* We only want to do this processing once. We don't need to keep trying
4177 to instantiate inline templates, because unit-at-a-time will make sure
4178 we get them compiled before functions that want to inline them. */
4179 if (DECL_ODR_USED (decl))
4182 /* If within finish_function, defer the rest until that function
4183 finishes, otherwise it might recurse. */
4184 if (defer_mark_used_calls)
4186 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4190 /* Normally, we can wait until instantiation-time to synthesize DECL.
4191 However, if DECL is a static data member initialized with a constant
4192 or a constexpr function, we need it right now because a reference to
4193 such a data member or a call to such function is not value-dependent. */
4194 if ((decl_maybe_constant_var_p (decl)
4195 || (TREE_CODE (decl) == FUNCTION_DECL
4196 && DECL_DECLARED_CONSTEXPR_P (decl)))
4197 && !DECL_INITIAL (decl)
4198 && DECL_LANG_SPECIFIC (decl)
4199 && DECL_TEMPLATE_INSTANTIATION (decl))
4201 /* Instantiating a function will result in garbage collection. We
4202 must treat this situation as if we were within the body of a
4203 function so as to avoid collecting live data only referenced from
4204 the stack (such as overload resolution candidates). */
4206 instantiate_decl (decl, /*defer_ok=*/false,
4207 /*expl_inst_class_mem_p=*/false);
4211 /* If we don't need a value, then we don't need to synthesize DECL. */
4212 if (cp_unevaluated_operand != 0)
4215 if (processing_template_decl)
4218 /* Check this too in case we're within fold_non_dependent_expr. */
4219 if (DECL_TEMPLATE_INFO (decl)
4220 && uses_template_parms (DECL_TI_ARGS (decl)))
4223 DECL_ODR_USED (decl) = 1;
4224 if (DECL_CLONED_FUNCTION_P (decl))
4225 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4227 /* DR 757: A type without linkage shall not be used as the type of a
4228 variable or function with linkage, unless
4229 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4230 o the variable or function is not used (3.2 [basic.def.odr]) or is
4231 defined in the same translation unit. */
4232 if (cxx_dialect > cxx98
4233 && decl_linkage (decl) != lk_none
4234 && !DECL_EXTERN_C_P (decl)
4235 && !DECL_ARTIFICIAL (decl)
4236 && !decl_defined_p (decl)
4237 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4239 if (is_local_extern (decl))
4240 /* There's no way to define a local extern, and adding it to
4241 the vector interferes with GC, so give an error now. */
4242 no_linkage_error (decl);
4244 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4247 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4248 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4249 /* Remember it, so we can check it was defined. */
4250 note_vague_linkage_fn (decl);
4252 /* Is it a synthesized method that needs to be synthesized? */
4253 if (TREE_CODE (decl) == FUNCTION_DECL
4254 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4255 && DECL_DEFAULTED_FN (decl)
4256 && ! DECL_INITIAL (decl))
4258 /* Remember the current location for a function we will end up
4259 synthesizing. Then we can inform the user where it was
4260 required in the case of error. */
4261 DECL_SOURCE_LOCATION (decl) = input_location;
4263 /* Synthesizing an implicitly defined member function will result in
4264 garbage collection. We must treat this situation as if we were
4265 within the body of a function so as to avoid collecting live data
4266 on the stack (such as overload resolution candidates).
4268 We could just let cp_write_global_declarations handle synthesizing
4269 this function, since we just added it to deferred_fns, but doing
4270 it at the use site produces better error messages. */
4272 synthesize_method (decl);
4274 /* If this is a synthesized method we don't need to
4275 do the instantiation test below. */
4277 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4278 && DECL_TEMPLATE_INFO (decl)
4279 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4280 || always_instantiate_p (decl)))
4281 /* If this is a function or variable that is an instance of some
4282 template, we now know that we will need to actually do the
4283 instantiation. We check that DECL is not an explicit
4284 instantiation because that is not checked in instantiate_decl.
4286 We put off instantiating functions in order to improve compile
4287 times. Maintaining a stack of active functions is expensive,
4288 and the inliner knows to instantiate any functions it might
4289 need. Therefore, we always try to defer instantiation. */
4290 instantiate_decl (decl, /*defer_ok=*/true,
4291 /*expl_inst_class_mem_p=*/false);
4294 #include "gt-cp-decl2.h"