1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
55 #include "pointer-set.h"
57 extern cpp_reader *parse_in;
59 /* This structure contains information about the initializations
60 and/or destructions required for a particular priority level. */
61 typedef struct priority_info_s {
62 /* Nonzero if there have been any initializations at this priority
63 throughout the translation unit. */
64 int initializations_p;
65 /* Nonzero if there have been any destructions at this priority
66 throughout the translation unit. */
70 static void mark_vtable_entries (tree);
71 static bool maybe_emit_vtables (tree);
72 static bool acceptable_java_type (tree);
73 static tree start_objects (int, int);
74 static void finish_objects (int, int, tree);
75 static tree start_static_storage_duration_function (unsigned);
76 static void finish_static_storage_duration_function (tree);
77 static priority_info get_priority_info (int);
78 static void do_static_initialization_or_destruction (tree, bool);
79 static void one_static_initialization_or_destruction (tree, tree, bool);
80 static void generate_ctor_or_dtor_function (bool, int, location_t *);
81 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
83 static tree prune_vars_needing_no_initialization (tree *);
84 static void write_out_vars (tree);
85 static void import_export_class (tree);
86 static tree get_guard_bits (tree);
87 static void determine_visibility_from_class (tree, tree);
88 static bool decl_defined_p (tree);
90 /* A list of static class variables. This is needed, because a
91 static class variable can be declared inside the class without
92 an initializer, and then initialized, statically, outside the class. */
93 static GTY(()) VEC(tree,gc) *pending_statics;
95 /* A list of functions which were declared inline, but which we
96 may need to emit outline anyway. */
97 static GTY(()) VEC(tree,gc) *deferred_fns;
99 /* A list of decls that use types with no linkage, which we need to make
101 static GTY(()) VEC(tree,gc) *no_linkage_decls;
103 /* Nonzero if we're done parsing and into end-of-file activities. */
109 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
110 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
111 that apply to the function). */
114 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
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 = TREE_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 TREE_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 TREE_CHAIN (parm) = parms;
267 arg_types = hash_tree_chain (integer_type_node, arg_types);
269 /* Insert our new parameter(s) into the list. */
270 TREE_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 /* Static consts need not be initialized in the class definition. */
775 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
777 static int explained = 0;
779 error ("initializer invalid for static member with constructor");
782 error ("(an out of class initialization is required)");
788 DECL_INITIAL (decl) = init;
789 DECL_IN_AGGR_P (decl) = 1;
791 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
792 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
793 SET_VAR_HAD_UNKNOWN_BOUND (decl);
795 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
798 /* DECLARATOR and DECLSPECS correspond to a class member. The other
799 parameters are as for cp_finish_decl. Return the DECL for the
800 class member declared. */
803 grokfield (const cp_declarator *declarator,
804 cp_decl_specifier_seq *declspecs,
805 tree init, bool init_const_expr_p,
810 const char *asmspec = 0;
811 int flags = LOOKUP_ONLYCONVERTING;
815 && TREE_CODE (init) == TREE_LIST
816 && TREE_VALUE (init) == error_mark_node
817 && TREE_CHAIN (init) == NULL_TREE)
820 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
821 if (! value || error_operand_p (value))
822 /* friend or constructor went bad. */
823 return error_mark_node;
825 if (TREE_CODE (value) == TYPE_DECL && init)
827 error ("typedef %qD is initialized (use decltype instead)", value);
831 /* Pass friendly classes back. */
832 if (value == void_type_node)
835 /* Pass friend decls back. */
836 if ((TREE_CODE (value) == FUNCTION_DECL
837 || TREE_CODE (value) == TEMPLATE_DECL)
838 && DECL_CONTEXT (value) != current_class_type)
841 name = DECL_NAME (value);
843 if (name != NULL_TREE)
845 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
847 error ("explicit template argument list not allowed");
848 return error_mark_node;
851 if (IDENTIFIER_POINTER (name)[0] == '_'
852 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
853 error ("member %qD conflicts with virtual function table field name",
857 /* Stash away type declarations. */
858 if (TREE_CODE (value) == TYPE_DECL)
860 DECL_NONLOCAL (value) = 1;
861 DECL_CONTEXT (value) = current_class_type;
863 if (processing_template_decl)
864 value = push_template_decl (value);
870 /* If this is a typedef that names the class for linkage purposes
871 (7.1.3p8), apply any attributes directly to the type. */
872 if (TAGGED_TYPE_P (TREE_TYPE (value))
873 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
874 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
876 cplus_decl_attributes (&value, attrlist, attrflags);
879 if (declspecs->specs[(int)ds_typedef]
880 && TREE_TYPE (value) != error_mark_node
881 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
882 cp_set_underlying_type (value);
887 if (DECL_IN_AGGR_P (value))
889 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
890 return void_type_node;
893 if (asmspec_tree && asmspec_tree != error_mark_node)
894 asmspec = TREE_STRING_POINTER (asmspec_tree);
898 if (TREE_CODE (value) == FUNCTION_DECL)
900 /* Initializers for functions are rejected early in the parser.
901 If we get here, it must be a pure specifier for a method. */
902 if (init == ridpointers[(int)RID_DELETE])
904 DECL_DELETED_FN (value) = 1;
905 DECL_DECLARED_INLINE_P (value) = 1;
906 DECL_INITIAL (value) = error_mark_node;
908 else if (init == ridpointers[(int)RID_DEFAULT])
910 if (defaultable_fn_check (value))
912 DECL_DEFAULTED_FN (value) = 1;
913 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
914 DECL_DECLARED_INLINE_P (value) = 1;
917 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
919 if (integer_zerop (init))
920 DECL_PURE_VIRTUAL_P (value) = 1;
921 else if (error_operand_p (init))
922 ; /* An error has already been reported. */
924 error ("invalid initializer for member function %qD",
929 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
930 error ("initializer specified for static member function %qD",
934 else if (pedantic && TREE_CODE (value) != VAR_DECL)
935 /* Already complained in grokdeclarator. */
937 else if (!processing_template_decl)
939 if (TREE_CODE (init) == CONSTRUCTOR)
940 init = digest_init (TREE_TYPE (value), init);
942 init = integral_constant_value (init);
944 if (init != error_mark_node && !TREE_CONSTANT (init))
946 /* We can allow references to things that are effectively
947 static, since references are initialized with the
949 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
950 || (TREE_STATIC (init) == 0
951 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
953 error ("field initializer is not constant");
954 init = error_mark_node;
960 if (processing_template_decl
961 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
963 value = push_template_decl (value);
964 if (error_operand_p (value))
965 return error_mark_node;
969 cplus_decl_attributes (&value, attrlist, 0);
971 switch (TREE_CODE (value))
974 finish_static_data_member_decl (value, init, init_const_expr_p,
975 asmspec_tree, flags);
980 error ("%<asm%> specifiers are not permitted on non-static data members");
981 if (DECL_INITIAL (value) == error_mark_node)
982 init = error_mark_node;
983 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
985 DECL_INITIAL (value) = init;
986 DECL_IN_AGGR_P (value) = 1;
991 set_user_assembler_name (value, asmspec);
993 cp_finish_decl (value,
995 /*init_const_expr_p=*/false,
996 asmspec_tree, flags);
998 /* Pass friends back this way. */
999 if (DECL_FRIEND_P (value))
1000 return void_type_node;
1002 DECL_IN_AGGR_P (value) = 1;
1011 /* Like `grokfield', but for bitfields.
1012 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1015 grokbitfield (const cp_declarator *declarator,
1016 cp_decl_specifier_seq *declspecs, tree width,
1019 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1021 if (value == error_mark_node)
1022 return NULL_TREE; /* friends went bad. */
1024 /* Pass friendly classes back. */
1025 if (TREE_CODE (value) == VOID_TYPE)
1026 return void_type_node;
1028 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
1029 && (POINTER_TYPE_P (value)
1030 || !dependent_type_p (TREE_TYPE (value))))
1032 error ("bit-field %qD with non-integral type", value);
1033 return error_mark_node;
1036 if (TREE_CODE (value) == TYPE_DECL)
1038 error ("cannot declare %qD to be a bit-field type", value);
1042 /* Usually, finish_struct_1 catches bitfields with invalid types.
1043 But, in the case of bitfields with function type, we confuse
1044 ourselves into thinking they are member functions, so we must
1046 if (TREE_CODE (value) == FUNCTION_DECL)
1048 error ("cannot declare bit-field %qD with function type",
1053 if (DECL_IN_AGGR_P (value))
1055 error ("%qD is already defined in the class %qT", value,
1056 DECL_CONTEXT (value));
1057 return void_type_node;
1060 if (TREE_STATIC (value))
1062 error ("static member %qD cannot be a bit-field", value);
1065 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1067 if (width != error_mark_node)
1069 constant_expression_warning (width);
1070 DECL_INITIAL (value) = width;
1071 SET_DECL_C_BIT_FIELD (value);
1074 DECL_IN_AGGR_P (value) = 1;
1077 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1083 /* Returns true iff ATTR is an attribute which needs to be applied at
1084 instantiation time rather than template definition time. */
1087 is_late_template_attribute (tree attr, tree decl)
1089 tree name = TREE_PURPOSE (attr);
1090 tree args = TREE_VALUE (attr);
1091 const struct attribute_spec *spec = lookup_attribute_spec (name);
1095 /* Unknown attribute. */
1098 /* Attribute weak handling wants to write out assembly right away. */
1099 if (is_attribute_p ("weak", name))
1102 /* If any of the arguments are dependent expressions, we can't evaluate
1103 the attribute until instantiation time. */
1104 for (arg = args; arg; arg = TREE_CHAIN (arg))
1106 tree t = TREE_VALUE (arg);
1108 /* If the first attribute argument is an identifier, only consider
1109 second and following arguments. Attributes like mode, format,
1110 cleanup and several target specific attributes aren't late
1111 just because they have an IDENTIFIER_NODE as first argument. */
1112 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1115 if (value_dependent_expression_p (t)
1116 || type_dependent_expression_p (t))
1120 if (TREE_CODE (decl) == TYPE_DECL
1122 || spec->type_required)
1124 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1126 /* We can't apply any attributes to a completely unknown type until
1127 instantiation time. */
1128 enum tree_code code = TREE_CODE (type);
1129 if (code == TEMPLATE_TYPE_PARM
1130 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1131 || code == TYPENAME_TYPE)
1133 /* Also defer most attributes on dependent types. This is not
1134 necessary in all cases, but is the better default. */
1135 else if (dependent_type_p (type)
1136 /* But attribute visibility specifically works on
1138 && !is_attribute_p ("visibility", name))
1147 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1148 applied at instantiation time and return them. If IS_DEPENDENT is true,
1149 the declaration itself is dependent, so all attributes should be applied
1150 at instantiation time. */
1153 splice_template_attributes (tree *attr_p, tree decl)
1156 tree late_attrs = NULL_TREE;
1157 tree *q = &late_attrs;
1164 if (is_late_template_attribute (*p, decl))
1166 ATTR_IS_DEPENDENT (*p) = 1;
1168 *p = TREE_CHAIN (*p);
1169 q = &TREE_CHAIN (*q);
1173 p = &TREE_CHAIN (*p);
1179 /* Remove any late attributes from the list in ATTR_P and attach them to
1183 save_template_attributes (tree *attr_p, tree *decl_p)
1185 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1187 tree old_attrs = NULL_TREE;
1192 if (DECL_P (*decl_p))
1193 q = &DECL_ATTRIBUTES (*decl_p);
1195 q = &TYPE_ATTRIBUTES (*decl_p);
1199 /* Place the late attributes at the beginning of the attribute
1201 TREE_CHAIN (tree_last (late_attrs)) = *q;
1204 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1206 /* We've added new attributes directly to the main variant, so
1207 now we need to update all of the other variants to include
1208 these new attributes. */
1210 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1211 variant = TYPE_NEXT_VARIANT (variant))
1213 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1214 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1219 /* Like reconstruct_complex_type, but handle also template trees. */
1222 cp_reconstruct_complex_type (tree type, tree bottom)
1226 if (TREE_CODE (type) == POINTER_TYPE)
1228 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1229 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1230 TYPE_REF_CAN_ALIAS_ALL (type));
1232 else if (TREE_CODE (type) == REFERENCE_TYPE)
1234 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1235 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1236 TYPE_REF_CAN_ALIAS_ALL (type));
1238 else if (TREE_CODE (type) == ARRAY_TYPE)
1240 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1241 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1242 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1243 element type qualification will be handled by the recursive
1244 cp_reconstruct_complex_type call and cp_build_qualified_type
1245 for ARRAY_TYPEs changes the element type. */
1248 else if (TREE_CODE (type) == FUNCTION_TYPE)
1250 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1251 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1252 outer = apply_memfn_quals (outer, type_memfn_quals (type));
1254 else if (TREE_CODE (type) == METHOD_TYPE)
1256 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1257 /* The build_method_type_directly() routine prepends 'this' to argument list,
1258 so we must compensate by getting rid of it. */
1260 = build_method_type_directly
1261 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1263 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1265 else if (TREE_CODE (type) == OFFSET_TYPE)
1267 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1268 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1273 if (TYPE_ATTRIBUTES (type))
1274 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1275 return cp_build_qualified_type (outer, cp_type_quals (type));
1278 /* Like decl_attributes, but handle C++ complexity. */
1281 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1283 if (*decl == NULL_TREE || *decl == void_type_node
1284 || *decl == error_mark_node
1285 || attributes == NULL_TREE)
1288 if (processing_template_decl)
1290 if (check_for_bare_parameter_packs (attributes))
1293 save_template_attributes (&attributes, decl);
1294 if (attributes == NULL_TREE)
1298 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1299 decl = &DECL_TEMPLATE_RESULT (*decl);
1301 decl_attributes (decl, attributes, flags);
1303 if (TREE_CODE (*decl) == TYPE_DECL)
1304 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1307 /* Walks through the namespace- or function-scope anonymous union
1308 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1309 Returns one of the fields for use in the mangled name. */
1312 build_anon_union_vars (tree type, tree object)
1314 tree main_decl = NULL_TREE;
1317 /* Rather than write the code to handle the non-union case,
1318 just give an error. */
1319 if (TREE_CODE (type) != UNION_TYPE)
1320 error ("anonymous struct not inside named type");
1322 for (field = TYPE_FIELDS (type);
1324 field = TREE_CHAIN (field))
1329 if (DECL_ARTIFICIAL (field))
1331 if (TREE_CODE (field) != FIELD_DECL)
1333 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1334 "have non-static data members", field);
1338 if (TREE_PRIVATE (field))
1339 permerror (input_location, "private member %q+#D in anonymous union", field);
1340 else if (TREE_PROTECTED (field))
1341 permerror (input_location, "protected member %q+#D in anonymous union", field);
1343 if (processing_template_decl)
1344 ref = build_min_nt (COMPONENT_REF, object,
1345 DECL_NAME (field), NULL_TREE);
1347 ref = build_class_member_access_expr (object, field, NULL_TREE,
1348 false, tf_warning_or_error);
1350 if (DECL_NAME (field))
1354 decl = build_decl (input_location,
1355 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1356 DECL_ANON_UNION_VAR_P (decl) = 1;
1357 DECL_ARTIFICIAL (decl) = 1;
1359 base = get_base_address (object);
1360 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1361 TREE_STATIC (decl) = TREE_STATIC (base);
1362 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1364 SET_DECL_VALUE_EXPR (decl, ref);
1365 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1367 decl = pushdecl (decl);
1369 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1370 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1374 if (main_decl == NULL_TREE)
1381 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1382 anonymous union, then all members must be laid out together. PUBLIC_P
1383 is nonzero if this union is not declared static. */
1386 finish_anon_union (tree anon_union_decl)
1392 if (anon_union_decl == error_mark_node)
1395 type = TREE_TYPE (anon_union_decl);
1396 public_p = TREE_PUBLIC (anon_union_decl);
1398 /* The VAR_DECL's context is the same as the TYPE's context. */
1399 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1401 if (TYPE_FIELDS (type) == NULL_TREE)
1406 error ("namespace-scope anonymous aggregates must be static");
1410 main_decl = build_anon_union_vars (type, anon_union_decl);
1411 if (main_decl == error_mark_node)
1413 if (main_decl == NULL_TREE)
1415 warning (0, "anonymous union with no members");
1419 if (!processing_template_decl)
1421 /* Use main_decl to set the mangled name. */
1422 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1423 maybe_commonize_var (anon_union_decl);
1424 mangle_decl (anon_union_decl);
1425 DECL_NAME (anon_union_decl) = NULL_TREE;
1428 pushdecl (anon_union_decl);
1429 if (building_stmt_tree ()
1430 && at_function_scope_p ())
1431 add_decl_expr (anon_union_decl);
1432 else if (!processing_template_decl)
1433 rest_of_decl_compilation (anon_union_decl,
1434 toplevel_bindings_p (), at_eof);
1437 /* Auxiliary functions to make type signatures for
1438 `operator new' and `operator delete' correspond to
1439 what compiler will be expecting. */
1442 coerce_new_type (tree type)
1445 tree args = TYPE_ARG_TYPES (type);
1447 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1449 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1452 error ("%<operator new%> must return type %qT", ptr_type_node);
1455 if (args && args != void_list_node)
1457 if (TREE_PURPOSE (args))
1459 /* [basic.stc.dynamic.allocation]
1461 The first parameter shall not have an associated default
1463 error ("the first parameter of %<operator new%> cannot "
1464 "have a default argument");
1465 /* Throw away the default argument. */
1466 TREE_PURPOSE (args) = NULL_TREE;
1469 if (!same_type_p (TREE_VALUE (args), size_type_node))
1472 args = TREE_CHAIN (args);
1479 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1480 "as first parameter", size_type_node);
1485 args = tree_cons (NULL_TREE, size_type_node, args);
1488 type = build_exception_variant
1489 (build_function_type (ptr_type_node, args),
1490 TYPE_RAISES_EXCEPTIONS (type));
1498 coerce_delete_type (tree type)
1501 tree args = TYPE_ARG_TYPES (type);
1503 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1505 if (!same_type_p (TREE_TYPE (type), void_type_node))
1508 error ("%<operator delete%> must return type %qT", void_type_node);
1511 if (!args || args == void_list_node
1512 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1515 if (args && args != void_list_node)
1516 args = TREE_CHAIN (args);
1517 error ("%<operator delete%> takes type %qT as first parameter",
1523 args = tree_cons (NULL_TREE, ptr_type_node, args);
1526 type = build_exception_variant
1527 (build_function_type (void_type_node, args),
1528 TYPE_RAISES_EXCEPTIONS (type));
1536 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1537 and mark them as needed. */
1540 mark_vtable_entries (tree decl)
1543 unsigned HOST_WIDE_INT idx;
1545 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1550 STRIP_NOPS (fnaddr);
1552 if (TREE_CODE (fnaddr) != ADDR_EXPR
1553 && TREE_CODE (fnaddr) != FDESC_EXPR)
1554 /* This entry is an offset: a virtual base class offset, a
1555 virtual call offset, an RTTI offset, etc. */
1558 fn = TREE_OPERAND (fnaddr, 0);
1559 TREE_ADDRESSABLE (fn) = 1;
1560 /* When we don't have vcall offsets, we output thunks whenever
1561 we output the vtables that contain them. With vcall offsets,
1562 we know all the thunks we'll need when we emit a virtual
1563 function, so we emit the thunks there instead. */
1564 if (DECL_THUNK_P (fn))
1565 use_thunk (fn, /*emit_p=*/0);
1570 /* Set DECL up to have the closest approximation of "initialized common"
1571 linkage available. */
1574 comdat_linkage (tree decl)
1577 make_decl_one_only (decl, cxx_comdat_group (decl));
1578 else if (TREE_CODE (decl) == FUNCTION_DECL
1579 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1580 /* We can just emit function and compiler-generated variables
1581 statically; having multiple copies is (for the most part) only
1584 There are two correctness issues, however: the address of a
1585 template instantiation with external linkage should be the
1586 same, independent of what translation unit asks for the
1587 address, and this will not hold when we emit multiple copies of
1588 the function. However, there's little else we can do.
1590 Also, by default, the typeinfo implementation assumes that
1591 there will be only one copy of the string used as the name for
1592 each type. Therefore, if weak symbols are unavailable, the
1593 run-time library should perform a more conservative check; it
1594 should perform a string comparison, rather than an address
1596 TREE_PUBLIC (decl) = 0;
1599 /* Static data member template instantiations, however, cannot
1600 have multiple copies. */
1601 if (DECL_INITIAL (decl) == 0
1602 || DECL_INITIAL (decl) == error_mark_node)
1603 DECL_COMMON (decl) = 1;
1604 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1606 DECL_COMMON (decl) = 1;
1607 DECL_INITIAL (decl) = error_mark_node;
1609 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1611 /* We can't do anything useful; leave vars for explicit
1613 DECL_EXTERNAL (decl) = 1;
1614 DECL_NOT_REALLY_EXTERN (decl) = 0;
1618 DECL_COMDAT (decl) = 1;
1621 /* For win32 we also want to put explicit instantiations in
1622 linkonce sections, so that they will be merged with implicit
1623 instantiations; otherwise we get duplicate symbol errors.
1624 For Darwin we do not want explicit instantiations to be
1628 maybe_make_one_only (tree decl)
1630 /* We used to say that this was not necessary on targets that support weak
1631 symbols, because the implicit instantiations will defer to the explicit
1632 one. However, that's not actually the case in SVR4; a strong definition
1633 after a weak one is an error. Also, not making explicit
1634 instantiations one_only means that we can end up with two copies of
1635 some template instantiations. */
1639 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1640 we can get away with not emitting them if they aren't used. We need
1641 to for variables so that cp_finish_decl will update their linkage,
1642 because their DECL_INITIAL may not have been set properly yet. */
1644 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1645 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1646 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1648 make_decl_one_only (decl, cxx_comdat_group (decl));
1650 if (TREE_CODE (decl) == VAR_DECL)
1652 DECL_COMDAT (decl) = 1;
1653 /* Mark it needed so we don't forget to emit it. */
1654 mark_decl_referenced (decl);
1659 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1660 This predicate will give the right answer during parsing of the
1661 function, which other tests may not. */
1664 vague_linkage_p (tree decl)
1666 /* Unfortunately, import_export_decl has not always been called
1667 before the function is processed, so we cannot simply check
1669 return (DECL_COMDAT (decl)
1670 || (((TREE_CODE (decl) == FUNCTION_DECL
1671 && DECL_DECLARED_INLINE_P (decl))
1672 || (DECL_LANG_SPECIFIC (decl)
1673 && DECL_TEMPLATE_INSTANTIATION (decl)))
1674 && TREE_PUBLIC (decl)));
1677 /* Determine whether or not we want to specifically import or export CTYPE,
1678 using various heuristics. */
1681 import_export_class (tree ctype)
1683 /* -1 for imported, 1 for exported. */
1684 int import_export = 0;
1686 /* It only makes sense to call this function at EOF. The reason is
1687 that this function looks at whether or not the first non-inline
1688 non-abstract virtual member function has been defined in this
1689 translation unit. But, we can't possibly know that until we've
1690 seen the entire translation unit. */
1691 gcc_assert (at_eof);
1693 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1696 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1697 we will have CLASSTYPE_INTERFACE_ONLY set but not
1698 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1699 heuristic because someone will supply a #pragma implementation
1700 elsewhere, and deducing it here would produce a conflict. */
1701 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1704 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1706 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1708 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1709 && !flag_implicit_templates)
1710 /* For a template class, without -fimplicit-templates, check the
1711 repository. If the virtual table is assigned to this
1712 translation unit, then export the class; otherwise, import
1714 import_export = repo_export_class_p (ctype) ? 1 : -1;
1715 else if (TYPE_POLYMORPHIC_P (ctype))
1717 /* The ABI specifies that the virtual table and associated
1718 information are emitted with the key method, if any. */
1719 tree method = CLASSTYPE_KEY_METHOD (ctype);
1720 /* If weak symbol support is not available, then we must be
1721 careful not to emit the vtable when the key function is
1722 inline. An inline function can be defined in multiple
1723 translation units. If we were to emit the vtable in each
1724 translation unit containing a definition, we would get
1725 multiple definition errors at link-time. */
1726 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1727 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1730 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1731 a definition anywhere else. */
1732 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1735 /* Allow back ends the chance to overrule the decision. */
1736 if (targetm.cxx.import_export_class)
1737 import_export = targetm.cxx.import_export_class (ctype, import_export);
1741 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1742 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1746 /* Return true if VAR has already been provided to the back end; in that
1747 case VAR should not be modified further by the front end. */
1749 var_finalized_p (tree var)
1751 return varpool_node (var)->finalized;
1754 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1755 must be emitted in this translation unit. Mark it as such. */
1758 mark_needed (tree decl)
1760 /* It's possible that we no longer need to set
1761 TREE_SYMBOL_REFERENCED here directly, but doing so is
1763 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1764 mark_decl_referenced (decl);
1767 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1768 returns true if a definition of this entity should be provided in
1769 this object file. Callers use this function to determine whether
1770 or not to let the back end know that a definition of DECL is
1771 available in this translation unit. */
1774 decl_needed_p (tree decl)
1776 gcc_assert (TREE_CODE (decl) == VAR_DECL
1777 || TREE_CODE (decl) == FUNCTION_DECL);
1778 /* This function should only be called at the end of the translation
1779 unit. We cannot be sure of whether or not something will be
1780 COMDAT until that point. */
1781 gcc_assert (at_eof);
1783 /* All entities with external linkage that are not COMDAT should be
1784 emitted; they may be referred to from other object files. */
1785 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1787 /* If this entity was used, let the back end see it; it will decide
1788 whether or not to emit it into the object file. */
1789 if (TREE_USED (decl)
1790 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1791 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1793 /* Functions marked "dllexport" must be emitted so that they are
1794 visible to other DLLs. */
1795 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1797 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1798 reference to DECL might cause it to be emitted later. */
1802 /* If necessary, write out the vtables for the dynamic class CTYPE.
1803 Returns true if any vtables were emitted. */
1806 maybe_emit_vtables (tree ctype)
1811 struct varpool_node *current = NULL, *last = NULL, *first = NULL;
1813 /* If the vtables for this class have already been emitted there is
1814 nothing more to do. */
1815 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1816 if (var_finalized_p (primary_vtbl))
1818 /* Ignore dummy vtables made by get_vtable_decl. */
1819 if (TREE_TYPE (primary_vtbl) == void_type_node)
1822 /* On some targets, we cannot determine the key method until the end
1823 of the translation unit -- which is when this function is
1825 if (!targetm.cxx.key_method_may_be_inline ())
1826 determine_key_method (ctype);
1828 /* See if any of the vtables are needed. */
1829 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1831 import_export_decl (vtbl);
1832 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1837 /* If the references to this class' vtables are optimized away,
1838 still emit the appropriate debugging information. See
1840 if (DECL_COMDAT (primary_vtbl)
1841 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1842 note_debug_info_needed (ctype);
1846 /* The ABI requires that we emit all of the vtables if we emit any
1848 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1850 /* Mark entities references from the virtual table as used. */
1851 mark_vtable_entries (vtbl);
1853 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1855 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1857 /* It had better be all done at compile-time. */
1862 DECL_EXTERNAL (vtbl) = 0;
1863 rest_of_decl_compilation (vtbl, 1, 1);
1865 /* Because we're only doing syntax-checking, we'll never end up
1866 actually marking the variable as written. */
1867 if (flag_syntax_only)
1868 TREE_ASM_WRITTEN (vtbl) = 1;
1869 else if (DECL_COMDAT (vtbl))
1871 current = varpool_node (vtbl);
1873 last->same_comdat_group = current;
1881 last->same_comdat_group = first;
1883 /* Since we're writing out the vtable here, also write the debug
1885 note_debug_info_needed (ctype);
1890 /* A special return value from type_visibility meaning internal
1893 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1895 /* walk_tree helper function for type_visibility. */
1898 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1900 int *vis_p = (int *)data;
1905 else if (CLASS_TYPE_P (*tp))
1907 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1909 *vis_p = VISIBILITY_ANON;
1912 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1913 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1918 /* Returns the visibility of TYPE, which is the minimum visibility of its
1922 type_visibility (tree type)
1924 int vis = VISIBILITY_DEFAULT;
1925 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1929 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1930 specified (or if VISIBILITY is static). */
1933 constrain_visibility (tree decl, int visibility)
1935 if (visibility == VISIBILITY_ANON)
1937 /* extern "C" declarations aren't affected by the anonymous
1939 if (!DECL_EXTERN_C_P (decl))
1941 TREE_PUBLIC (decl) = 0;
1942 DECL_WEAK (decl) = 0;
1943 DECL_COMMON (decl) = 0;
1944 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1945 DECL_INTERFACE_KNOWN (decl) = 1;
1946 if (DECL_LANG_SPECIFIC (decl))
1947 DECL_NOT_REALLY_EXTERN (decl) = 1;
1950 else if (visibility > DECL_VISIBILITY (decl)
1951 && !DECL_VISIBILITY_SPECIFIED (decl))
1953 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1959 /* Constrain the visibility of DECL based on the visibility of its template
1963 constrain_visibility_for_template (tree decl, tree targs)
1965 /* If this is a template instantiation, check the innermost
1966 template args for visibility constraints. The outer template
1967 args are covered by the class check. */
1968 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1970 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1974 tree arg = TREE_VEC_ELT (args, i-1);
1976 vis = type_visibility (arg);
1977 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1980 if (TREE_CODE (arg) == ADDR_EXPR)
1981 arg = TREE_OPERAND (arg, 0);
1982 if (TREE_CODE (arg) == VAR_DECL
1983 || TREE_CODE (arg) == FUNCTION_DECL)
1985 if (! TREE_PUBLIC (arg))
1986 vis = VISIBILITY_ANON;
1988 vis = DECL_VISIBILITY (arg);
1992 constrain_visibility (decl, vis);
1996 /* Like c_determine_visibility, but with additional C++-specific
1999 Function-scope entities can rely on the function's visibility because
2000 it is set in start_preparsed_function.
2002 Class-scope entities cannot rely on the class's visibility until the end
2003 of the enclosing class definition.
2005 Note that because namespaces have multiple independent definitions,
2006 namespace visibility is handled elsewhere using the #pragma visibility
2007 machinery rather than by decorating the namespace declaration.
2009 The goal is for constraints from the type to give a diagnostic, and
2010 other constraints to be applied silently. */
2013 determine_visibility (tree decl)
2015 tree class_type = NULL_TREE;
2017 bool orig_visibility_specified;
2018 enum symbol_visibility orig_visibility;
2020 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2022 /* Only relevant for names with external linkage. */
2023 if (!TREE_PUBLIC (decl))
2026 /* Cloned constructors and destructors get the same visibility as
2027 the underlying function. That should be set up in
2028 maybe_clone_body. */
2029 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2031 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2032 orig_visibility = DECL_VISIBILITY (decl);
2034 if (TREE_CODE (decl) == TYPE_DECL)
2036 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2037 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2038 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2043 else if (DECL_LANG_SPECIFIC (decl))
2044 use_template = DECL_USE_TEMPLATE (decl);
2048 /* If DECL is a member of a class, visibility specifiers on the
2049 class can influence the visibility of the DECL. */
2050 if (DECL_CLASS_SCOPE_P (decl))
2051 class_type = DECL_CONTEXT (decl);
2054 /* Not a class member. */
2056 /* Virtual tables have DECL_CONTEXT set to their associated class,
2057 so they are automatically handled above. */
2058 gcc_assert (TREE_CODE (decl) != VAR_DECL
2059 || !DECL_VTABLE_OR_VTT_P (decl));
2061 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2063 /* Local statics and classes get the visibility of their
2064 containing function by default, except that
2065 -fvisibility-inlines-hidden doesn't affect them. */
2066 tree fn = DECL_CONTEXT (decl);
2067 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2069 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2070 DECL_VISIBILITY_SPECIFIED (decl) =
2071 DECL_VISIBILITY_SPECIFIED (fn);
2074 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2076 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2077 but have no TEMPLATE_INFO, so don't try to check it. */
2080 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2081 && flag_visibility_ms_compat)
2083 /* Under -fvisibility-ms-compat, types are visible by default,
2084 even though their contents aren't. */
2085 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2086 int underlying_vis = type_visibility (underlying_type);
2087 if (underlying_vis == VISIBILITY_ANON
2088 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
2089 constrain_visibility (decl, underlying_vis);
2091 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2093 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2095 /* tinfo visibility is based on the type it's for. */
2096 constrain_visibility
2097 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2099 /* Give the target a chance to override the visibility associated
2101 if (TREE_PUBLIC (decl)
2102 && !DECL_REALLY_EXTERN (decl)
2103 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2104 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2105 targetm.cxx.determine_class_data_visibility (decl);
2107 else if (use_template)
2108 /* Template instantiations and specializations get visibility based
2109 on their template unless they override it with an attribute. */;
2110 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2112 /* Set default visibility to whatever the user supplied with
2113 #pragma GCC visibility or a namespace visibility attribute. */
2114 DECL_VISIBILITY (decl) = default_visibility;
2115 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2121 /* If the specialization doesn't specify visibility, use the
2122 visibility from the template. */
2123 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2124 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2125 : DECL_TEMPLATE_INFO (decl));
2126 tree args = TI_ARGS (tinfo);
2128 if (args != error_mark_node)
2130 int depth = TMPL_ARGS_DEPTH (args);
2131 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2133 if (!DECL_VISIBILITY_SPECIFIED (decl))
2135 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2136 DECL_VISIBILITY_SPECIFIED (decl)
2137 = DECL_VISIBILITY_SPECIFIED (pattern);
2140 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2141 if (args && depth > template_class_depth (class_type))
2142 /* Limit visibility based on its template arguments. */
2143 constrain_visibility_for_template (decl, args);
2148 determine_visibility_from_class (decl, class_type);
2150 if (decl_anon_ns_mem_p (decl))
2151 /* Names in an anonymous namespace get internal linkage.
2152 This might change once we implement export. */
2153 constrain_visibility (decl, VISIBILITY_ANON);
2154 else if (TREE_CODE (decl) != TYPE_DECL)
2156 /* Propagate anonymity from type to decl. */
2157 int tvis = type_visibility (TREE_TYPE (decl));
2158 if (tvis == VISIBILITY_ANON
2159 || ! DECL_VISIBILITY_SPECIFIED (decl))
2160 constrain_visibility (decl, tvis);
2162 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2163 /* DR 757: A type without linkage shall not be used as the type of a
2164 variable or function with linkage, unless
2165 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2166 o the variable or function is not used (3.2 [basic.def.odr]) or is
2167 defined in the same translation unit.
2169 Since non-extern "C" decls need to be defined in the same
2170 translation unit, we can make the type internal. */
2171 constrain_visibility (decl, VISIBILITY_ANON);
2173 /* If visibility changed and DECL already has DECL_RTL, ensure
2174 symbol flags are updated. */
2175 if ((DECL_VISIBILITY (decl) != orig_visibility
2176 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2177 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2178 || TREE_CODE (decl) == FUNCTION_DECL)
2179 && DECL_RTL_SET_P (decl))
2180 make_decl_rtl (decl);
2183 /* By default, static data members and function members receive
2184 the visibility of their containing class. */
2187 determine_visibility_from_class (tree decl, tree class_type)
2189 if (DECL_VISIBILITY_SPECIFIED (decl))
2192 if (visibility_options.inlines_hidden
2193 /* Don't do this for inline templates; specializations might not be
2194 inline, and we don't want them to inherit the hidden
2195 visibility. We'll set it here for all inline instantiations. */
2196 && !processing_template_decl
2197 && TREE_CODE (decl) == FUNCTION_DECL
2198 && DECL_DECLARED_INLINE_P (decl)
2199 && (! DECL_LANG_SPECIFIC (decl)
2200 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2201 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2204 /* Default to the class visibility. */
2205 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2206 DECL_VISIBILITY_SPECIFIED (decl)
2207 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2210 /* Give the target a chance to override the visibility associated
2212 if (TREE_CODE (decl) == VAR_DECL
2213 && (DECL_TINFO_P (decl)
2214 || (DECL_VTABLE_OR_VTT_P (decl)
2215 /* Construction virtual tables are not exported because
2216 they cannot be referred to from other object files;
2217 their name is not standardized by the ABI. */
2218 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2219 && TREE_PUBLIC (decl)
2220 && !DECL_REALLY_EXTERN (decl)
2221 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2222 targetm.cxx.determine_class_data_visibility (decl);
2225 /* Constrain the visibility of a class TYPE based on the visibility of its
2226 field types. Warn if any fields require lesser visibility. */
2229 constrain_class_visibility (tree type)
2235 int vis = type_visibility (type);
2237 if (vis == VISIBILITY_ANON
2238 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2241 /* Don't warn about visibility if the class has explicit visibility. */
2242 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2243 vis = VISIBILITY_INTERNAL;
2245 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2246 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2248 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2249 int subvis = type_visibility (ftype);
2251 if (subvis == VISIBILITY_ANON)
2253 if (!in_main_input_context ())
2255 %qT has a field %qD whose type uses the anonymous namespace",
2258 else if (MAYBE_CLASS_TYPE_P (ftype)
2259 && vis < VISIBILITY_HIDDEN
2260 && subvis >= VISIBILITY_HIDDEN)
2261 warning (OPT_Wattributes, "\
2262 %qT declared with greater visibility than the type of its field %qD",
2266 binfo = TYPE_BINFO (type);
2267 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2269 int subvis = type_visibility (TREE_TYPE (t));
2271 if (subvis == VISIBILITY_ANON)
2273 if (!in_main_input_context())
2275 %qT has a base %qT whose type uses the anonymous namespace",
2276 type, TREE_TYPE (t));
2278 else if (vis < VISIBILITY_HIDDEN
2279 && subvis >= VISIBILITY_HIDDEN)
2280 warning (OPT_Wattributes, "\
2281 %qT declared with greater visibility than its base %qT",
2282 type, TREE_TYPE (t));
2286 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2287 for DECL has not already been determined, do so now by setting
2288 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2289 function is called entities with vague linkage whose definitions
2290 are available must have TREE_PUBLIC set.
2292 If this function decides to place DECL in COMDAT, it will set
2293 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2294 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2295 callers defer that decision until it is clear that DECL is actually
2299 import_export_decl (tree decl)
2304 tree class_type = NULL_TREE;
2306 if (DECL_INTERFACE_KNOWN (decl))
2309 /* We cannot determine what linkage to give to an entity with vague
2310 linkage until the end of the file. For example, a virtual table
2311 for a class will be defined if and only if the key method is
2312 defined in this translation unit. As a further example, consider
2313 that when compiling a translation unit that uses PCH file with
2314 "-frepo" it would be incorrect to make decisions about what
2315 entities to emit when building the PCH; those decisions must be
2316 delayed until the repository information has been processed. */
2317 gcc_assert (at_eof);
2318 /* Object file linkage for explicit instantiations is handled in
2319 mark_decl_instantiated. For static variables in functions with
2320 vague linkage, maybe_commonize_var is used.
2322 Therefore, the only declarations that should be provided to this
2323 function are those with external linkage that are:
2325 * implicit instantiations of function templates
2329 * implicit instantiations of static data members of class
2336 Furthermore, all entities that reach this point must have a
2337 definition available in this translation unit.
2339 The following assertions check these conditions. */
2340 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2341 || TREE_CODE (decl) == VAR_DECL);
2342 /* Any code that creates entities with TREE_PUBLIC cleared should
2343 also set DECL_INTERFACE_KNOWN. */
2344 gcc_assert (TREE_PUBLIC (decl));
2345 if (TREE_CODE (decl) == FUNCTION_DECL)
2346 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2347 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2348 || DECL_DECLARED_INLINE_P (decl));
2350 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2351 || DECL_VTABLE_OR_VTT_P (decl)
2352 || DECL_TINFO_P (decl));
2353 /* Check that a definition of DECL is available in this translation
2355 gcc_assert (!DECL_REALLY_EXTERN (decl));
2357 /* Assume that DECL will not have COMDAT linkage. */
2359 /* Assume that DECL will not be imported into this translation
2363 /* See if the repository tells us whether or not to emit DECL in
2364 this translation unit. */
2365 emit_p = repo_emit_p (decl);
2368 else if (emit_p == 1)
2370 /* The repository indicates that this entity should be defined
2371 here. Make sure the back end honors that request. */
2372 if (TREE_CODE (decl) == VAR_DECL)
2374 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2375 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2378 FOR_EACH_CLONE (clone, decl)
2379 mark_needed (clone);
2383 /* Output the definition as an ordinary strong definition. */
2384 DECL_EXTERNAL (decl) = 0;
2385 DECL_INTERFACE_KNOWN (decl) = 1;
2390 /* We have already decided what to do with this DECL; there is no
2391 need to check anything further. */
2393 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2395 class_type = DECL_CONTEXT (decl);
2396 import_export_class (class_type);
2397 if (TYPE_FOR_JAVA (class_type))
2399 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2400 && CLASSTYPE_INTERFACE_ONLY (class_type))
2402 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2403 && !CLASSTYPE_USE_TEMPLATE (class_type)
2404 && CLASSTYPE_KEY_METHOD (class_type)
2405 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2406 /* The ABI requires that all virtual tables be emitted with
2407 COMDAT linkage. However, on systems where COMDAT symbols
2408 don't show up in the table of contents for a static
2409 archive, or on systems without weak symbols (where we
2410 approximate COMDAT linkage by using internal linkage), the
2411 linker will report errors about undefined symbols because
2412 it will not see the virtual table definition. Therefore,
2413 in the case that we know that the virtual table will be
2414 emitted in only one translation unit, we make the virtual
2415 table an ordinary definition with external linkage. */
2416 DECL_EXTERNAL (decl) = 0;
2417 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2419 /* CLASS_TYPE is being exported from this translation unit,
2420 so DECL should be defined here. */
2421 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2422 /* If a class is declared in a header with the "extern
2423 template" extension, then it will not be instantiated,
2424 even in translation units that would normally require
2425 it. Often such classes are explicitly instantiated in
2426 one translation unit. Therefore, the explicit
2427 instantiation must be made visible to other translation
2429 DECL_EXTERNAL (decl) = 0;
2432 /* The generic C++ ABI says that class data is always
2433 COMDAT, even if there is a key function. Some
2434 variants (e.g., the ARM EABI) says that class data
2435 only has COMDAT linkage if the class data might be
2436 emitted in more than one translation unit. When the
2437 key method can be inline and is inline, we still have
2438 to arrange for comdat even though
2439 class_data_always_comdat is false. */
2440 if (!CLASSTYPE_KEY_METHOD (class_type)
2441 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2442 || targetm.cxx.class_data_always_comdat ())
2444 /* The ABI requires COMDAT linkage. Normally, we
2445 only emit COMDAT things when they are needed;
2446 make sure that we realize that this entity is
2453 else if (!flag_implicit_templates
2454 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2459 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2461 tree type = TREE_TYPE (DECL_NAME (decl));
2462 if (CLASS_TYPE_P (type))
2465 import_export_class (type);
2466 if (CLASSTYPE_INTERFACE_KNOWN (type)
2467 && TYPE_POLYMORPHIC_P (type)
2468 && CLASSTYPE_INTERFACE_ONLY (type)
2469 /* If -fno-rtti was specified, then we cannot be sure
2470 that RTTI information will be emitted with the
2471 virtual table of the class, so we must emit it
2472 wherever it is used. */
2477 if (CLASSTYPE_INTERFACE_KNOWN (type)
2478 && !CLASSTYPE_INTERFACE_ONLY (type))
2480 comdat_p = (targetm.cxx.class_data_always_comdat ()
2481 || (CLASSTYPE_KEY_METHOD (type)
2482 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2487 DECL_EXTERNAL (decl) = 0;
2497 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2498 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2500 /* DECL is an implicit instantiation of a function or static
2502 if ((flag_implicit_templates
2503 && !flag_use_repository)
2504 || (flag_implicit_inline_templates
2505 && TREE_CODE (decl) == FUNCTION_DECL
2506 && DECL_DECLARED_INLINE_P (decl)))
2509 /* If we are not implicitly generating templates, then mark
2510 this entity as undefined in this translation unit. */
2513 else if (DECL_FUNCTION_MEMBER_P (decl))
2515 if (!DECL_DECLARED_INLINE_P (decl))
2517 tree ctype = DECL_CONTEXT (decl);
2518 import_export_class (ctype);
2519 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2521 DECL_NOT_REALLY_EXTERN (decl)
2522 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2523 || (DECL_DECLARED_INLINE_P (decl)
2524 && ! flag_implement_inlines
2525 && !DECL_VINDEX (decl)));
2527 if (!DECL_NOT_REALLY_EXTERN (decl))
2528 DECL_EXTERNAL (decl) = 1;
2530 /* Always make artificials weak. */
2531 if (DECL_ARTIFICIAL (decl) && flag_weak)
2534 maybe_make_one_only (decl);
2545 /* If we are importing DECL into this translation unit, mark is
2546 an undefined here. */
2547 DECL_EXTERNAL (decl) = 1;
2548 DECL_NOT_REALLY_EXTERN (decl) = 0;
2552 /* If we decided to put DECL in COMDAT, mark it accordingly at
2554 comdat_linkage (decl);
2557 DECL_INTERFACE_KNOWN (decl) = 1;
2560 /* Return an expression that performs the destruction of DECL, which
2561 must be a VAR_DECL whose type has a non-trivial destructor, or is
2562 an array whose (innermost) elements have a non-trivial destructor. */
2565 build_cleanup (tree decl)
2568 tree type = TREE_TYPE (decl);
2570 /* This function should only be called for declarations that really
2571 require cleanups. */
2572 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2574 /* Treat all objects with destructors as used; the destructor may do
2575 something substantive. */
2578 if (TREE_CODE (type) == ARRAY_TYPE)
2581 temp = build_address (decl);
2582 temp = build_delete (TREE_TYPE (temp), temp,
2583 sfk_complete_destructor,
2584 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2588 /* Returns the initialization guard variable for the variable DECL,
2589 which has static storage duration. */
2592 get_guard (tree decl)
2597 sname = mangle_guard_variable (decl);
2598 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2603 /* We use a type that is big enough to contain a mutex as well
2604 as an integer counter. */
2605 guard_type = targetm.cxx.guard_type ();
2606 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2607 VAR_DECL, sname, guard_type);
2609 /* The guard should have the same linkage as what it guards. */
2610 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2611 TREE_STATIC (guard) = TREE_STATIC (decl);
2612 DECL_COMMON (guard) = DECL_COMMON (decl);
2613 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2614 if (DECL_ONE_ONLY (decl))
2615 make_decl_one_only (guard, cxx_comdat_group (guard));
2616 if (TREE_PUBLIC (decl))
2617 DECL_WEAK (guard) = DECL_WEAK (decl);
2618 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2619 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2621 DECL_ARTIFICIAL (guard) = 1;
2622 DECL_IGNORED_P (guard) = 1;
2623 TREE_USED (guard) = 1;
2624 pushdecl_top_level_and_finish (guard, NULL_TREE);
2629 /* Return those bits of the GUARD variable that should be set when the
2630 guarded entity is actually initialized. */
2633 get_guard_bits (tree guard)
2635 if (!targetm.cxx.guard_mask_bit ())
2637 /* We only set the first byte of the guard, in order to leave room
2638 for a mutex in the high-order bits. */
2639 guard = build1 (ADDR_EXPR,
2640 build_pointer_type (TREE_TYPE (guard)),
2642 guard = build1 (NOP_EXPR,
2643 build_pointer_type (char_type_node),
2645 guard = build1 (INDIRECT_REF, char_type_node, guard);
2651 /* Return an expression which determines whether or not the GUARD
2652 variable has already been initialized. */
2655 get_guard_cond (tree guard)
2659 /* Check to see if the GUARD is zero. */
2660 guard = get_guard_bits (guard);
2662 /* Mask off all but the low bit. */
2663 if (targetm.cxx.guard_mask_bit ())
2665 guard_value = integer_one_node;
2666 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2667 guard_value = convert (TREE_TYPE (guard), guard_value);
2668 guard = cp_build_binary_op (input_location,
2669 BIT_AND_EXPR, guard, guard_value,
2670 tf_warning_or_error);
2673 guard_value = integer_zero_node;
2674 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2675 guard_value = convert (TREE_TYPE (guard), guard_value);
2676 return cp_build_binary_op (input_location,
2677 EQ_EXPR, guard, guard_value,
2678 tf_warning_or_error);
2681 /* Return an expression which sets the GUARD variable, indicating that
2682 the variable being guarded has been initialized. */
2685 set_guard (tree guard)
2689 /* Set the GUARD to one. */
2690 guard = get_guard_bits (guard);
2691 guard_init = integer_one_node;
2692 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2693 guard_init = convert (TREE_TYPE (guard), guard_init);
2694 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2695 tf_warning_or_error);
2698 /* Start the process of running a particular set of global constructors
2699 or destructors. Subroutine of do_[cd]tors. */
2702 start_objects (int method_type, int initp)
2708 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2710 if (initp != DEFAULT_INIT_PRIORITY)
2720 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2723 sprintf (type, "%c", method_type);
2725 fndecl = build_lang_decl (FUNCTION_DECL,
2726 get_file_function_name (type),
2727 build_function_type (void_type_node,
2729 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2731 TREE_PUBLIC (current_function_decl) = 0;
2733 /* Mark as artificial because it's not explicitly in the user's
2735 DECL_ARTIFICIAL (current_function_decl) = 1;
2737 /* Mark this declaration as used to avoid spurious warnings. */
2738 TREE_USED (current_function_decl) = 1;
2740 /* Mark this function as a global constructor or destructor. */
2741 if (method_type == 'I')
2742 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2744 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2746 body = begin_compound_stmt (BCS_FN_BODY);
2751 /* Finish the process of running a particular set of global constructors
2752 or destructors. Subroutine of do_[cd]tors. */
2755 finish_objects (int method_type, int initp, tree body)
2760 finish_compound_stmt (body);
2761 fn = finish_function (0);
2763 if (method_type == 'I')
2765 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2766 decl_init_priority_insert (fn, initp);
2770 DECL_STATIC_DESTRUCTOR (fn) = 1;
2771 decl_fini_priority_insert (fn, initp);
2774 expand_or_defer_fn (fn);
2777 /* The names of the parameters to the function created to handle
2778 initializations and destructions for objects with static storage
2780 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2781 #define PRIORITY_IDENTIFIER "__priority"
2783 /* The name of the function we create to handle initializations and
2784 destructions for objects with static storage duration. */
2785 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2787 /* The declaration for the __INITIALIZE_P argument. */
2788 static GTY(()) tree initialize_p_decl;
2790 /* The declaration for the __PRIORITY argument. */
2791 static GTY(()) tree priority_decl;
2793 /* The declaration for the static storage duration function. */
2794 static GTY(()) tree ssdf_decl;
2796 /* All the static storage duration functions created in this
2797 translation unit. */
2798 static GTY(()) VEC(tree,gc) *ssdf_decls;
2800 /* A map from priority levels to information about that priority
2801 level. There may be many such levels, so efficient lookup is
2803 static splay_tree priority_info_map;
2805 /* Begins the generation of the function that will handle all
2806 initialization and destruction of objects with static storage
2807 duration. The function generated takes two parameters of type
2808 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2809 nonzero, it performs initializations. Otherwise, it performs
2810 destructions. It only performs those initializations or
2811 destructions with the indicated __PRIORITY. The generated function
2814 It is assumed that this function will only be called once per
2815 translation unit. */
2818 start_static_storage_duration_function (unsigned count)
2823 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2825 /* Create the identifier for this function. It will be of the form
2826 SSDF_IDENTIFIER_<number>. */
2827 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2829 /* Create the parameters. */
2830 parm_types = void_list_node;
2831 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2832 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2833 type = build_function_type (void_type_node, parm_types);
2835 /* Create the FUNCTION_DECL itself. */
2836 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2837 get_identifier (id),
2839 TREE_PUBLIC (ssdf_decl) = 0;
2840 DECL_ARTIFICIAL (ssdf_decl) = 1;
2842 /* Put this function in the list of functions to be called from the
2843 static constructors and destructors. */
2846 ssdf_decls = VEC_alloc (tree, gc, 32);
2848 /* Take this opportunity to initialize the map from priority
2849 numbers to information about that priority level. */
2850 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2851 /*delete_key_fn=*/0,
2852 /*delete_value_fn=*/
2853 (splay_tree_delete_value_fn) &free);
2855 /* We always need to generate functions for the
2856 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2857 priorities later, we'll be sure to find the
2858 DEFAULT_INIT_PRIORITY. */
2859 get_priority_info (DEFAULT_INIT_PRIORITY);
2862 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2864 /* Create the argument list. */
2865 initialize_p_decl = cp_build_parm_decl
2866 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2867 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2868 TREE_USED (initialize_p_decl) = 1;
2869 priority_decl = cp_build_parm_decl
2870 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2871 DECL_CONTEXT (priority_decl) = ssdf_decl;
2872 TREE_USED (priority_decl) = 1;
2874 TREE_CHAIN (initialize_p_decl) = priority_decl;
2875 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2877 /* Put the function in the global scope. */
2878 pushdecl (ssdf_decl);
2880 /* Start the function itself. This is equivalent to declaring the
2883 static void __ssdf (int __initialize_p, init __priority_p);
2885 It is static because we only need to call this function from the
2886 various constructor and destructor functions for this module. */
2887 start_preparsed_function (ssdf_decl,
2888 /*attrs=*/NULL_TREE,
2891 /* Set up the scope of the outermost block in the function. */
2892 body = begin_compound_stmt (BCS_FN_BODY);
2897 /* Finish the generation of the function which performs initialization
2898 and destruction of objects with static storage duration. After
2899 this point, no more such objects can be created. */
2902 finish_static_storage_duration_function (tree body)
2904 /* Close out the function. */
2905 finish_compound_stmt (body);
2906 expand_or_defer_fn (finish_function (0));
2909 /* Return the information about the indicated PRIORITY level. If no
2910 code to handle this level has yet been generated, generate the
2911 appropriate prologue. */
2913 static priority_info
2914 get_priority_info (int priority)
2919 n = splay_tree_lookup (priority_info_map,
2920 (splay_tree_key) priority);
2923 /* Create a new priority information structure, and insert it
2925 pi = XNEW (struct priority_info_s);
2926 pi->initializations_p = 0;
2927 pi->destructions_p = 0;
2928 splay_tree_insert (priority_info_map,
2929 (splay_tree_key) priority,
2930 (splay_tree_value) pi);
2933 pi = (priority_info) n->value;
2938 /* The effective initialization priority of a DECL. */
2940 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2941 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2942 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2944 /* Whether a DECL needs a guard to protect it against multiple
2947 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2948 || DECL_ONE_ONLY (decl) \
2949 || DECL_WEAK (decl)))
2951 /* Called from one_static_initialization_or_destruction(),
2953 Walks the initializer list of a global variable and looks for
2954 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2955 and that have their DECL_CONTEXT() == NULL.
2956 For each such temporary variable, set their DECL_CONTEXT() to
2957 the current function. This is necessary because otherwise
2958 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2959 when trying to refer to a temporary variable that does not have
2960 it's DECL_CONTECT() properly set. */
2962 fix_temporary_vars_context_r (tree *node,
2963 int *unused ATTRIBUTE_UNUSED,
2964 void *unused1 ATTRIBUTE_UNUSED)
2966 gcc_assert (current_function_decl);
2968 if (TREE_CODE (*node) == BIND_EXPR)
2972 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2973 if (TREE_CODE (var) == VAR_DECL
2975 && DECL_ARTIFICIAL (var)
2976 && !DECL_CONTEXT (var))
2977 DECL_CONTEXT (var) = current_function_decl;
2983 /* Set up to handle the initialization or destruction of DECL. If
2984 INITP is nonzero, we are initializing the variable. Otherwise, we
2985 are destroying it. */
2988 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2990 tree guard_if_stmt = NULL_TREE;
2993 /* If we are supposed to destruct and there's a trivial destructor,
2994 nothing has to be done. */
2996 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2999 /* Trick the compiler into thinking we are at the file and line
3000 where DECL was declared so that error-messages make sense, and so
3001 that the debugger will show somewhat sensible file and line
3003 input_location = DECL_SOURCE_LOCATION (decl);
3005 /* Make sure temporary variables in the initialiser all have
3006 their DECL_CONTEXT() set to a value different from NULL_TREE.
3007 This can happen when global variables initialisers are built.
3008 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3009 the temporary variables that might have been generated in the
3010 accompagning initialisers is NULL_TREE, meaning the variables have been
3011 declared in the global namespace.
3012 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3013 of the temporaries are set to the current function decl. */
3014 cp_walk_tree_without_duplicates (&init,
3015 fix_temporary_vars_context_r,
3022 Access control for implicit calls to the constructors,
3023 the conversion functions, or the destructor called to
3024 create and destroy a static data member is performed as
3025 if these calls appeared in the scope of the member's
3028 we pretend we are in a static member function of the class of
3029 which the DECL is a member. */
3030 if (member_p (decl))
3032 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3033 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3036 /* Assume we don't need a guard. */
3038 /* We need a guard if this is an object with external linkage that
3039 might be initialized in more than one place. (For example, a
3040 static data member of a template, when the data member requires
3042 if (NEEDS_GUARD_P (decl))
3046 guard = get_guard (decl);
3048 /* When using __cxa_atexit, we just check the GUARD as we would
3049 for a local static. */
3050 if (flag_use_cxa_atexit)
3052 /* When using __cxa_atexit, we never try to destroy
3053 anything from a static destructor. */
3055 guard_cond = get_guard_cond (guard);
3057 /* If we don't have __cxa_atexit, then we will be running
3058 destructors from .fini sections, or their equivalents. So,
3059 we need to know how many times we've tried to initialize this
3060 object. We do initializations only if the GUARD is zero,
3061 i.e., if we are the first to initialize the variable. We do
3062 destructions only if the GUARD is one, i.e., if we are the
3063 last to destroy the variable. */
3066 = cp_build_binary_op (input_location,
3068 cp_build_unary_op (PREINCREMENT_EXPR,
3071 tf_warning_or_error),
3073 tf_warning_or_error);
3076 = cp_build_binary_op (input_location,
3078 cp_build_unary_op (PREDECREMENT_EXPR,
3081 tf_warning_or_error),
3083 tf_warning_or_error);
3085 guard_if_stmt = begin_if_stmt ();
3086 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3090 /* If we're using __cxa_atexit, we have not already set the GUARD,
3091 so we must do so now. */
3092 if (guard && initp && flag_use_cxa_atexit)
3093 finish_expr_stmt (set_guard (guard));
3095 /* Perform the initialization or destruction. */
3099 finish_expr_stmt (init);
3101 /* If we're using __cxa_atexit, register a function that calls the
3102 destructor for the object. */
3103 if (flag_use_cxa_atexit)
3104 finish_expr_stmt (register_dtor_fn (decl));
3107 finish_expr_stmt (build_cleanup (decl));
3109 /* Finish the guard if-stmt, if necessary. */
3112 finish_then_clause (guard_if_stmt);
3113 finish_if_stmt (guard_if_stmt);
3116 /* Now that we're done with DECL we don't need to pretend to be a
3117 member of its class any longer. */
3118 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3119 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3122 /* Generate code to do the initialization or destruction of the decls in VARS,
3123 a TREE_LIST of VAR_DECL with static storage duration.
3124 Whether initialization or destruction is performed is specified by INITP. */
3127 do_static_initialization_or_destruction (tree vars, bool initp)
3129 tree node, init_if_stmt, cond;
3131 /* Build the outer if-stmt to check for initialization or destruction. */
3132 init_if_stmt = begin_if_stmt ();
3133 cond = initp ? integer_one_node : integer_zero_node;
3134 cond = cp_build_binary_op (input_location,
3138 tf_warning_or_error);
3139 finish_if_stmt_cond (cond, init_if_stmt);
3143 tree decl = TREE_VALUE (node);
3144 tree priority_if_stmt;
3148 /* If we don't need a destructor, there's nothing to do. Avoid
3149 creating a possibly empty if-stmt. */
3150 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3152 node = TREE_CHAIN (node);
3156 /* Remember that we had an initialization or finalization at this
3158 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3159 pi = get_priority_info (priority);
3161 pi->initializations_p = 1;
3163 pi->destructions_p = 1;
3165 /* Conditionalize this initialization on being in the right priority
3166 and being initializing/finalizing appropriately. */
3167 priority_if_stmt = begin_if_stmt ();
3168 cond = cp_build_binary_op (input_location,
3171 build_int_cst (NULL_TREE, priority),
3172 tf_warning_or_error);
3173 finish_if_stmt_cond (cond, priority_if_stmt);
3175 /* Process initializers with same priority. */
3177 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3178 node = TREE_CHAIN (node))
3179 /* Do one initialization or destruction. */
3180 one_static_initialization_or_destruction (TREE_VALUE (node),
3181 TREE_PURPOSE (node), initp);
3183 /* Finish up the priority if-stmt body. */
3184 finish_then_clause (priority_if_stmt);
3185 finish_if_stmt (priority_if_stmt);
3189 /* Finish up the init/destruct if-stmt body. */
3190 finish_then_clause (init_if_stmt);
3191 finish_if_stmt (init_if_stmt);
3194 /* VARS is a list of variables with static storage duration which may
3195 need initialization and/or finalization. Remove those variables
3196 that don't really need to be initialized or finalized, and return
3197 the resulting list. The order in which the variables appear in
3198 VARS is in reverse order of the order in which they should actually
3199 be initialized. The list we return is in the unreversed order;
3200 i.e., the first variable should be initialized first. */
3203 prune_vars_needing_no_initialization (tree *vars)
3206 tree result = NULL_TREE;
3211 tree decl = TREE_VALUE (t);
3212 tree init = TREE_PURPOSE (t);
3214 /* Deal gracefully with error. */
3215 if (decl == error_mark_node)
3217 var = &TREE_CHAIN (t);
3221 /* The only things that can be initialized are variables. */
3222 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3224 /* If this object is not defined, we don't need to do anything
3226 if (DECL_EXTERNAL (decl))
3228 var = &TREE_CHAIN (t);
3232 /* Also, if the initializer already contains errors, we can bail
3234 if (init && TREE_CODE (init) == TREE_LIST
3235 && value_member (error_mark_node, init))
3237 var = &TREE_CHAIN (t);
3241 /* This variable is going to need initialization and/or
3242 finalization, so we add it to the list. */
3243 *var = TREE_CHAIN (t);
3244 TREE_CHAIN (t) = result;
3251 /* Make sure we have told the back end about all the variables in
3255 write_out_vars (tree vars)
3259 for (v = vars; v; v = TREE_CHAIN (v))
3261 tree var = TREE_VALUE (v);
3262 if (!var_finalized_p (var))
3264 import_export_decl (var);
3265 rest_of_decl_compilation (var, 1, 1);
3270 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3271 (otherwise) that will initialize all global objects with static
3272 storage duration having the indicated PRIORITY. */
3275 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3284 input_location = *locus;
3286 /* Was: locus->line++; */
3288 /* We use `I' to indicate initialization and `D' to indicate
3290 function_key = constructor_p ? 'I' : 'D';
3292 /* We emit the function lazily, to avoid generating empty
3293 global constructors and destructors. */
3296 /* For Objective-C++, we may need to initialize metadata found in this module.
3297 This must be done _before_ any other static initializations. */
3298 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3299 && constructor_p && objc_static_init_needed_p ())
3301 body = start_objects (function_key, priority);
3302 objc_generate_static_init_call (NULL_TREE);
3305 /* Call the static storage duration function with appropriate
3307 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3309 /* Calls to pure or const functions will expand to nothing. */
3310 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3313 body = start_objects (function_key, priority);
3315 arguments = tree_cons (NULL_TREE,
3316 build_int_cst (NULL_TREE, priority),
3318 arguments = tree_cons (NULL_TREE,
3319 build_int_cst (NULL_TREE, constructor_p),
3321 finish_expr_stmt (cp_build_function_call (fndecl, arguments,
3322 tf_warning_or_error));
3326 /* Close out the function. */
3328 finish_objects (function_key, priority, body);
3331 /* Generate constructor and destructor functions for the priority
3335 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3337 location_t *locus = (location_t *) data;
3338 int priority = (int) n->key;
3339 priority_info pi = (priority_info) n->value;
3341 /* Generate the functions themselves, but only if they are really
3343 if (pi->initializations_p)
3344 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3345 if (pi->destructions_p)
3346 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3348 /* Keep iterating. */
3352 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3353 decls referenced from front-end specific constructs; it will be called
3354 only for language-specific tree nodes.
3356 Here we must deal with member pointers. */
3359 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3363 switch (TREE_CODE (t))
3366 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3367 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3370 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3371 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3374 if (DECL_CONTEXT (t)
3375 && flag_use_repository
3376 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3377 /* If we need a static variable in a function, then we
3378 need the containing function. */
3379 mark_decl_referenced (DECL_CONTEXT (t));
3388 /* Java requires that we be able to reference a local address for a
3389 method, and not be confused by PLT entries. If hidden aliases are
3390 supported, collect and return all the functions for which we should
3391 emit a hidden alias. */
3393 static struct pointer_set_t *
3394 collect_candidates_for_java_method_aliases (void)
3396 struct cgraph_node *node;
3397 struct pointer_set_t *candidates = NULL;
3399 #ifndef HAVE_GAS_HIDDEN
3403 for (node = cgraph_nodes; node ; node = node->next)
3405 tree fndecl = node->decl;
3407 if (DECL_CONTEXT (fndecl)
3408 && TYPE_P (DECL_CONTEXT (fndecl))
3409 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3410 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3412 if (candidates == NULL)
3413 candidates = pointer_set_create ();
3414 pointer_set_insert (candidates, fndecl);
3422 /* Java requires that we be able to reference a local address for a
3423 method, and not be confused by PLT entries. If hidden aliases are
3424 supported, emit one for each java function that we've emitted.
3425 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3426 by collect_candidates_for_java_method_aliases. */
3429 build_java_method_aliases (struct pointer_set_t *candidates)
3431 struct cgraph_node *node;
3433 #ifndef HAVE_GAS_HIDDEN
3437 for (node = cgraph_nodes; node ; node = node->next)
3439 tree fndecl = node->decl;
3441 if (TREE_ASM_WRITTEN (fndecl)
3442 && pointer_set_contains (candidates, fndecl))
3444 /* Mangle the name in a predictable way; we need to reference
3445 this from a java compiled object file. */
3446 tree oid, nid, alias;
3450 oid = DECL_ASSEMBLER_NAME (fndecl);
3451 oname = IDENTIFIER_POINTER (oid);
3452 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3453 nname = ACONCAT (("_ZGA", oname+2, NULL));
3454 nid = get_identifier (nname);
3456 alias = make_alias_for (fndecl, nid);
3457 TREE_PUBLIC (alias) = 1;
3458 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3460 assemble_alias (alias, oid);
3465 /* Returns true iff there is a definition available for variable or
3469 decl_defined_p (tree decl)
3471 if (TREE_CODE (decl) == FUNCTION_DECL)
3472 return (DECL_INITIAL (decl) != NULL_TREE);
3475 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3476 return !DECL_EXTERNAL (decl);
3480 /* Complain that DECL uses a type with no linkage but is never defined. */
3483 no_linkage_error (tree decl)
3485 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3486 if (TYPE_ANONYMOUS_P (t))
3488 permerror (0, "%q+#D, declared using anonymous type, "
3489 "is used but never defined", decl);
3490 if (is_typedef_decl (TYPE_NAME (t)))
3491 permerror (0, "%q+#D does not refer to the unqualified type, "
3492 "so it is not used for linkage", TYPE_NAME (t));
3495 permerror (0, "%q+#D, declared using local type %qT, "
3496 "is used but never defined", decl, t);
3499 /* This routine is called at the end of compilation.
3500 Its job is to create all the code needed to initialize and
3501 destroy the global aggregates. We do the destruction
3502 first, since that way we only need to reverse the decls once. */
3505 cp_write_global_declarations (void)
3511 unsigned ssdf_count = 0;
3514 struct pointer_set_t *candidates;
3516 locus = input_location;
3519 /* Bad parse errors. Just forget about it. */
3520 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3524 c_common_write_pch ();
3526 /* FIXME - huh? was input_line -= 1;*/
3528 /* We now have to write out all the stuff we put off writing out.
3531 o Template specializations that we have not yet instantiated,
3532 but which are needed.
3533 o Initialization and destruction for non-local objects with
3534 static storage duration. (Local objects with static storage
3535 duration are initialized when their scope is first entered,
3536 and are cleaned up via atexit.)
3537 o Virtual function tables.
3539 All of these may cause others to be needed. For example,
3540 instantiating one function may cause another to be needed, and
3541 generating the initializer for an object may cause templates to be
3542 instantiated, etc., etc. */
3544 timevar_push (TV_VARCONST);
3546 emit_support_tinfos ();
3555 /* If there are templates that we've put off instantiating, do
3557 instantiate_pending_templates (retries);
3560 /* Write out virtual tables as required. Note that writing out
3561 the virtual table for a template class may cause the
3562 instantiation of members of that class. If we write out
3563 vtables then we remove the class from our list so we don't
3564 have to look at it again. */
3566 while (keyed_classes != NULL_TREE
3567 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3570 keyed_classes = TREE_CHAIN (keyed_classes);
3576 tree next = TREE_CHAIN (t);
3580 if (maybe_emit_vtables (TREE_VALUE (next)))
3583 TREE_CHAIN (t) = TREE_CHAIN (next);
3588 next = TREE_CHAIN (t);
3592 /* Write out needed type info variables. We have to be careful
3593 looping through unemitted decls, because emit_tinfo_decl may
3594 cause other variables to be needed. New elements will be
3595 appended, and we remove from the vector those that actually
3597 for (i = VEC_length (tree, unemitted_tinfo_decls);
3598 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3599 if (emit_tinfo_decl (t))
3602 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3605 /* The list of objects with static storage duration is built up
3606 in reverse order. We clear STATIC_AGGREGATES so that any new
3607 aggregates added during the initialization of these will be
3608 initialized in the correct order when we next come around the
3610 vars = prune_vars_needing_no_initialization (&static_aggregates);
3614 /* We need to start a new initialization function each time
3615 through the loop. That's because we need to know which
3616 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3617 isn't computed until a function is finished, and written
3618 out. That's a deficiency in the back end. When this is
3619 fixed, these initialization functions could all become
3620 inline, with resulting performance improvements. */
3623 /* Set the line and file, so that it is obviously not from
3625 input_location = locus;
3626 ssdf_body = start_static_storage_duration_function (ssdf_count);
3628 /* Make sure the back end knows about all the variables. */
3629 write_out_vars (vars);
3631 /* First generate code to do all the initializations. */
3633 do_static_initialization_or_destruction (vars, /*initp=*/true);
3635 /* Then, generate code to do all the destructions. Do these
3636 in reverse order so that the most recently constructed
3637 variable is the first destroyed. If we're using
3638 __cxa_atexit, then we don't need to do this; functions
3639 were registered at initialization time to destroy the
3641 if (!flag_use_cxa_atexit && vars)
3643 vars = nreverse (vars);
3644 do_static_initialization_or_destruction (vars, /*initp=*/false);
3649 /* Finish up the static storage duration function for this
3651 input_location = locus;
3652 finish_static_storage_duration_function (ssdf_body);
3654 /* All those initializations and finalizations might cause
3655 us to need more inline functions, more template
3656 instantiations, etc. */
3659 /* ??? was: locus.line++; */
3662 /* Go through the set of inline functions whose bodies have not
3663 been emitted yet. If out-of-line copies of these functions
3664 are required, emit them. */
3665 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3667 /* Does it need synthesizing? */
3668 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3669 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3671 /* Even though we're already at the top-level, we push
3672 there again. That way, when we pop back a few lines
3673 hence, all of our state is restored. Otherwise,
3674 finish_function doesn't clean things up, and we end
3675 up with CURRENT_FUNCTION_DECL set. */
3676 push_to_top_level ();
3677 /* The decl's location will mark where it was first
3678 needed. Save that so synthesize method can indicate
3679 where it was needed from, in case of error */
3680 input_location = DECL_SOURCE_LOCATION (decl);
3681 synthesize_method (decl);
3682 pop_from_top_level ();
3686 if (!DECL_SAVED_TREE (decl))
3689 /* We lie to the back end, pretending that some functions
3690 are not defined when they really are. This keeps these
3691 functions from being put out unnecessarily. But, we must
3692 stop lying when the functions are referenced, or if they
3693 are not comdat since they need to be put out now. If
3694 DECL_INTERFACE_KNOWN, then we have already set
3695 DECL_EXTERNAL appropriately, so there's no need to check
3696 again, and we do not want to clear DECL_EXTERNAL if a
3697 previous call to import_export_decl set it.
3699 This is done in a separate for cycle, because if some
3700 deferred function is contained in another deferred
3701 function later in deferred_fns varray,
3702 rest_of_compilation would skip this function and we
3703 really cannot expand the same function twice. */
3704 import_export_decl (decl);
3705 if (DECL_NOT_REALLY_EXTERN (decl)
3706 && DECL_INITIAL (decl)
3707 && decl_needed_p (decl))
3709 struct cgraph_node *node = cgraph_get_node (decl), *alias, *next;
3711 DECL_EXTERNAL (decl) = 0;
3712 /* If we mark !DECL_EXTERNAL one of the same body aliases,
3713 we need to mark all of them that way. */
3714 if (node && node->same_body)
3716 DECL_EXTERNAL (node->decl) = 0;
3717 for (alias = node->same_body; alias; alias = alias->next)
3718 DECL_EXTERNAL (alias->decl) = 0;
3720 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3721 group, we need to mark all symbols in the same comdat group
3723 if (node->same_comdat_group)
3724 for (next = node->same_comdat_group;
3726 next = next->same_comdat_group)
3728 DECL_EXTERNAL (next->decl) = 0;
3729 if (next->same_body)
3731 for (alias = next->same_body;
3733 alias = alias->next)
3734 DECL_EXTERNAL (alias->decl) = 0;
3739 /* If we're going to need to write this function out, and
3740 there's already a body for it, create RTL for it now.
3741 (There might be no body if this is a method we haven't
3742 gotten around to synthesizing yet.) */
3743 if (!DECL_EXTERNAL (decl)
3744 && decl_needed_p (decl)
3745 && !TREE_ASM_WRITTEN (decl)
3746 && !cgraph_node (decl)->local.finalized)
3748 /* We will output the function; no longer consider it in this
3750 DECL_DEFER_OUTPUT (decl) = 0;
3751 /* Generate RTL for this function now that we know we
3753 expand_or_defer_fn (decl);
3754 /* If we're compiling -fsyntax-only pretend that this
3755 function has been written out so that we don't try to
3757 if (flag_syntax_only)
3758 TREE_ASM_WRITTEN (decl) = 1;
3763 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3766 /* Static data members are just like namespace-scope globals. */
3767 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3769 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3770 /* Don't write it out if we haven't seen a definition. */
3771 || DECL_IN_AGGR_P (decl))
3773 import_export_decl (decl);
3774 /* If this static data member is needed, provide it to the
3776 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3777 DECL_EXTERNAL (decl) = 0;
3779 if (VEC_length (tree, pending_statics) != 0
3780 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3781 VEC_length (tree, pending_statics)))
3788 /* All used inline functions must have a definition at this point. */
3789 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3791 if (/* Check online inline functions that were actually used. */
3792 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3793 /* If the definition actually was available here, then the
3794 fact that the function was not defined merely represents
3795 that for some reason (use of a template repository,
3796 #pragma interface, etc.) we decided not to emit the
3798 && !DECL_INITIAL (decl)
3799 /* An explicit instantiation can be used to specify
3800 that the body is in another unit. It will have
3801 already verified there was a definition. */
3802 && !DECL_EXPLICIT_INSTANTIATION (decl))
3804 warning (0, "inline function %q+D used but never defined", decl);
3805 /* Avoid a duplicate warning from check_global_declaration_1. */
3806 TREE_NO_WARNING (decl) = 1;
3810 /* So must decls that use a type with no linkage. */
3811 for (i = 0; VEC_iterate (tree, no_linkage_decls, i, decl); ++i)
3812 if (!decl_defined_p (decl))
3813 no_linkage_error (decl);
3815 /* We give C linkage to static constructors and destructors. */
3816 push_lang_context (lang_name_c);
3818 /* Generate initialization and destruction functions for all
3819 priorities for which they are required. */
3820 if (priority_info_map)
3821 splay_tree_foreach (priority_info_map,
3822 generate_ctor_and_dtor_functions_for_priority,
3824 else if (c_dialect_objc () && objc_static_init_needed_p ())
3825 /* If this is obj-c++ and we need a static init, call
3826 generate_ctor_or_dtor_function. */
3827 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3828 DEFAULT_INIT_PRIORITY, &locus);
3830 /* We're done with the splay-tree now. */
3831 if (priority_info_map)
3832 splay_tree_delete (priority_info_map);
3834 /* Generate any missing aliases. */
3835 maybe_apply_pending_pragma_weaks ();
3837 /* We're done with static constructors, so we can go back to "C++"
3839 pop_lang_context ();
3841 /* Collect candidates for Java hidden aliases. */
3842 candidates = collect_candidates_for_java_method_aliases ();
3844 cgraph_finalize_compilation_unit ();
3846 /* Now, issue warnings about static, but not defined, functions,
3847 etc., and emit debugging information. */
3848 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3849 if (VEC_length (tree, pending_statics) != 0)
3851 check_global_declarations (VEC_address (tree, pending_statics),
3852 VEC_length (tree, pending_statics));
3853 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3854 VEC_length (tree, pending_statics));
3857 /* Generate hidden aliases for Java. */
3860 build_java_method_aliases (candidates);
3861 pointer_set_destroy (candidates);
3866 /* The entire file is now complete. If requested, dump everything
3870 FILE *stream = dump_begin (TDI_tu, &flags);
3874 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3875 dump_end (TDI_tu, stream);
3879 timevar_pop (TV_VARCONST);
3881 if (flag_detailed_statistics)
3883 dump_tree_statistics ();
3884 dump_time_statistics ();
3886 input_location = locus;
3888 #ifdef ENABLE_CHECKING
3889 validate_conversion_obstack ();
3890 #endif /* ENABLE_CHECKING */
3893 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3894 function to call in parse-tree form; it has not yet been
3895 semantically analyzed. ARGS are the arguments to the function.
3896 They have already been semantically analyzed. This may change
3900 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
3903 VEC(tree,gc) *orig_args = NULL;
3908 object = TREE_OPERAND (fn, 0);
3910 if (processing_template_decl)
3912 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3913 || TREE_CODE (fn) == MEMBER_REF);
3914 if (type_dependent_expression_p (fn)
3915 || any_type_dependent_arguments_p (*args))
3916 return build_nt_call_vec (fn, *args);
3918 orig_args = make_tree_vector_copy (*args);
3920 /* Transform the arguments and add the implicit "this"
3921 parameter. That must be done before the FN is transformed
3922 because we depend on the form of FN. */
3923 make_args_non_dependent (*args);
3924 object = build_non_dependent_expr (object);
3925 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3926 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
3927 VEC_safe_insert (tree, gc, *args, 0, object);
3928 /* Now that the arguments are done, transform FN. */
3929 fn = build_non_dependent_expr (fn);
3932 /* A qualified name corresponding to a bound pointer-to-member is
3933 represented as an OFFSET_REF:
3935 struct B { void g(); };
3937 void B::g() { (this->*p)(); } */
3938 if (TREE_CODE (fn) == OFFSET_REF)
3940 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
3941 tf_warning_or_error);
3942 fn = TREE_OPERAND (fn, 1);
3943 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3944 VEC_safe_insert (tree, gc, *args, 0, object_addr);
3947 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
3948 if (processing_template_decl && expr != error_mark_node)
3949 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
3951 if (orig_args != NULL)
3952 release_tree_vector (orig_args);
3959 check_default_args (tree x)
3961 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3962 bool saw_def = false;
3963 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3964 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3966 if (TREE_PURPOSE (arg))
3970 error ("default argument missing for parameter %P of %q+#D", i, x);
3971 TREE_PURPOSE (arg) = error_mark_node;
3976 /* Return true if function DECL can be inlined. This is used to force
3977 instantiation of methods that might be interesting for inlining. */
3979 possibly_inlined_p (tree decl)
3981 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
3982 if (DECL_UNINLINABLE (decl))
3984 if (!optimize || pragma_java_exceptions)
3985 return DECL_DECLARED_INLINE_P (decl);
3986 /* When optimizing, we might inline everything when flatten
3987 attribute or heuristics inlining for size or autoinlining
3992 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3993 If DECL is a specialization or implicitly declared class member,
3994 generate the actual definition. */
3997 mark_used (tree decl)
3999 HOST_WIDE_INT saved_processing_template_decl = 0;
4001 /* If DECL is a BASELINK for a single function, then treat it just
4002 like the DECL for the function. Otherwise, if the BASELINK is
4003 for an overloaded function, we don't know which function was
4004 actually used until after overload resolution. */
4005 if (TREE_CODE (decl) == BASELINK)
4007 decl = BASELINK_FUNCTIONS (decl);
4008 if (really_overloaded_fn (decl))
4010 decl = OVL_CURRENT (decl);
4013 /* Set TREE_USED for the benefit of -Wunused. */
4014 TREE_USED (decl) = 1;
4015 if (DECL_CLONED_FUNCTION_P (decl))
4016 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4018 if (TREE_CODE (decl) == FUNCTION_DECL
4019 && DECL_DELETED_FN (decl))
4021 if (DECL_ARTIFICIAL (decl))
4023 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
4024 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
4026 /* We mark a lambda conversion op as deleted if we can't
4027 generate it properly; see maybe_add_lambda_conv_op. */
4028 sorry ("converting lambda which uses %<...%> to "
4029 "function pointer");
4033 error ("deleted function %q+D", decl);
4034 error ("used here");
4037 /* If we don't need a value, then we don't need to synthesize DECL. */
4038 if (cp_unevaluated_operand != 0)
4041 /* We can only check DECL_ODR_USED on variables or functions with
4042 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4043 might need special handling for. */
4044 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4045 || DECL_LANG_SPECIFIC (decl) == NULL
4046 || DECL_THUNK_P (decl))
4049 /* We only want to do this processing once. We don't need to keep trying
4050 to instantiate inline templates, because unit-at-a-time will make sure
4051 we get them compiled before functions that want to inline them. */
4052 if (DECL_ODR_USED (decl))
4055 /* If within finish_function, defer the rest until that function
4056 finishes, otherwise it might recurse. */
4057 if (defer_mark_used_calls)
4059 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4063 /* Normally, we can wait until instantiation-time to synthesize
4064 DECL. However, if DECL is a static data member initialized with
4065 a constant, we need the value right now because a reference to
4066 such a data member is not value-dependent. */
4067 if (TREE_CODE (decl) == VAR_DECL
4068 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4069 && DECL_CLASS_SCOPE_P (decl))
4071 /* Don't try to instantiate members of dependent types. We
4072 cannot just use dependent_type_p here because this function
4073 may be called from fold_non_dependent_expr, and then we may
4074 see dependent types, even though processing_template_decl
4076 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
4077 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
4079 /* Pretend that we are not in a template, even if we are, so
4080 that the static data member initializer will be processed. */
4081 saved_processing_template_decl = processing_template_decl;
4082 processing_template_decl = 0;
4085 if (processing_template_decl)
4088 DECL_ODR_USED (decl) = 1;
4089 if (DECL_CLONED_FUNCTION_P (decl))
4090 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4092 /* DR 757: A type without linkage shall not be used as the type of a
4093 variable or function with linkage, unless
4094 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4095 o the variable or function is not used (3.2 [basic.def.odr]) or is
4096 defined in the same translation unit. */
4097 if (cxx_dialect > cxx98
4098 && decl_linkage (decl) != lk_none
4099 && !DECL_EXTERN_C_P (decl)
4100 && !DECL_ARTIFICIAL (decl)
4101 && !decl_defined_p (decl)
4102 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4104 if (is_local_extern (decl))
4105 /* There's no way to define a local extern, and adding it to
4106 the vector interferes with GC, so give an error now. */
4107 no_linkage_error (decl);
4109 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4112 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4113 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4114 /* Remember it, so we can check it was defined. */
4115 note_vague_linkage_fn (decl);
4117 /* Is it a synthesized method that needs to be synthesized? */
4118 if (TREE_CODE (decl) == FUNCTION_DECL
4119 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4120 && DECL_DEFAULTED_FN (decl)
4121 && ! DECL_INITIAL (decl))
4123 /* Remember the current location for a function we will end up
4124 synthesizing. Then we can inform the user where it was
4125 required in the case of error. */
4126 DECL_SOURCE_LOCATION (decl) = input_location;
4128 /* Synthesizing an implicitly defined member function will result in
4129 garbage collection. We must treat this situation as if we were
4130 within the body of a function so as to avoid collecting live data
4131 on the stack (such as overload resolution candidates).
4133 We could just let cp_write_global_declarations handle synthesizing
4134 this function, since we just added it to deferred_fns, but doing
4135 it at the use site produces better error messages. */
4137 synthesize_method (decl);
4139 /* If this is a synthesized method we don't need to
4140 do the instantiation test below. */
4142 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4143 && DECL_TEMPLATE_INFO (decl)
4144 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4145 || always_instantiate_p (decl)))
4146 /* If this is a function or variable that is an instance of some
4147 template, we now know that we will need to actually do the
4148 instantiation. We check that DECL is not an explicit
4149 instantiation because that is not checked in instantiate_decl.
4151 We put off instantiating functions in order to improve compile
4152 times. Maintaining a stack of active functions is expensive,
4153 and the inliner knows to instantiate any functions it might
4154 need. Therefore, we always try to defer instantiation. */
4155 instantiate_decl (decl, /*defer_ok=*/true,
4156 /*expl_inst_class_mem_p=*/false);
4158 processing_template_decl = saved_processing_template_decl;
4161 #include "gt-cp-decl2.h"