1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010,
4 2011 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
44 #include "c-family/c-common.h"
45 #include "c-family/c-objc.h"
46 #include "tree-mudflap.h"
48 #include "tree-inline.h"
49 #include "c-family/c-pragma.h"
50 #include "tree-dump.h"
53 #include "pointer-set.h"
54 #include "splay-tree.h"
55 #include "langhooks.h"
56 #include "c-family/c-ada-spec.h"
58 extern cpp_reader *parse_in;
60 /* This structure contains information about the initializations
61 and/or destructions required for a particular priority level. */
62 typedef struct priority_info_s {
63 /* Nonzero if there have been any initializations at this priority
64 throughout the translation unit. */
65 int initializations_p;
66 /* Nonzero if there have been any destructions at this priority
67 throughout the translation unit. */
71 static void mark_vtable_entries (tree);
72 static bool maybe_emit_vtables (tree);
73 static bool acceptable_java_type (tree);
74 static tree start_objects (int, int);
75 static void finish_objects (int, int, tree);
76 static tree start_static_storage_duration_function (unsigned);
77 static void finish_static_storage_duration_function (tree);
78 static priority_info get_priority_info (int);
79 static void do_static_initialization_or_destruction (tree, bool);
80 static void one_static_initialization_or_destruction (tree, tree, bool);
81 static void generate_ctor_or_dtor_function (bool, int, location_t *);
82 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
84 static tree prune_vars_needing_no_initialization (tree *);
85 static void write_out_vars (tree);
86 static void import_export_class (tree);
87 static tree get_guard_bits (tree);
88 static void determine_visibility_from_class (tree, tree);
89 static bool decl_defined_p (tree);
91 /* A list of static class variables. This is needed, because a
92 static class variable can be declared inside the class without
93 an initializer, and then initialized, statically, outside the class. */
94 static GTY(()) VEC(tree,gc) *pending_statics;
96 /* A list of functions which were declared inline, but which we
97 may need to emit outline anyway. */
98 static GTY(()) VEC(tree,gc) *deferred_fns;
100 /* A list of decls that use types with no linkage, which we need to make
102 static GTY(()) VEC(tree,gc) *no_linkage_decls;
104 /* Nonzero if we're done parsing and into end-of-file activities. */
110 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
111 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
112 that apply to the function). */
115 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
121 if (fntype == error_mark_node || ctype == error_mark_node)
122 return error_mark_node;
124 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
125 || TREE_CODE (fntype) == METHOD_TYPE);
127 type_quals = quals & ~TYPE_QUAL_RESTRICT;
128 ctype = cp_build_qualified_type (ctype, type_quals);
129 raises = TYPE_RAISES_EXCEPTIONS (fntype);
130 attrs = TYPE_ATTRIBUTES (fntype);
131 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
132 (TREE_CODE (fntype) == METHOD_TYPE
133 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
134 : TYPE_ARG_TYPES (fntype)));
136 fntype = build_exception_variant (fntype, raises);
138 fntype = cp_build_type_attribute_variant (fntype, attrs);
143 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
144 return type changed to NEW_RET. */
147 change_return_type (tree new_ret, tree fntype)
150 tree args = TYPE_ARG_TYPES (fntype);
151 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
152 tree attrs = TYPE_ATTRIBUTES (fntype);
154 if (same_type_p (new_ret, TREE_TYPE (fntype)))
157 if (TREE_CODE (fntype) == FUNCTION_TYPE)
159 newtype = build_function_type (new_ret, args);
160 newtype = apply_memfn_quals (newtype, type_memfn_quals (fntype));
163 newtype = build_method_type_directly
164 (class_of_this_parm (fntype), new_ret, TREE_CHAIN (args));
166 newtype = build_exception_variant (newtype, raises);
168 newtype = cp_build_type_attribute_variant (newtype, attrs);
173 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
177 cp_build_parm_decl (tree name, tree type)
179 tree parm = build_decl (input_location,
180 PARM_DECL, name, type);
181 /* DECL_ARG_TYPE is only used by the back end and the back end never
183 if (!processing_template_decl)
184 DECL_ARG_TYPE (parm) = type_passed_as (type);
186 /* If the type is a pack expansion, then we have a function
188 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
189 FUNCTION_PARAMETER_PACK_P (parm) = 1;
194 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
198 build_artificial_parm (tree name, tree type)
200 tree parm = cp_build_parm_decl (name, type);
201 DECL_ARTIFICIAL (parm) = 1;
202 /* All our artificial parms are implicitly `const'; they cannot be
204 TREE_READONLY (parm) = 1;
208 /* Constructors for types with virtual baseclasses need an "in-charge" flag
209 saying whether this constructor is responsible for initialization of
210 virtual baseclasses or not. All destructors also need this "in-charge"
211 flag, which additionally determines whether or not the destructor should
212 free the memory for the object.
214 This function adds the "in-charge" flag to member function FN if
215 appropriate. It is called from grokclassfn and tsubst.
216 FN must be either a constructor or destructor.
218 The in-charge flag follows the 'this' parameter, and is followed by the
219 VTT parm (if any), then the user-written parms. */
222 maybe_retrofit_in_chrg (tree fn)
224 tree basetype, arg_types, parms, parm, fntype;
226 /* If we've already add the in-charge parameter don't do it again. */
227 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
230 /* When processing templates we can't know, in general, whether or
231 not we're going to have virtual baseclasses. */
232 if (processing_template_decl)
235 /* We don't need an in-charge parameter for constructors that don't
236 have virtual bases. */
237 if (DECL_CONSTRUCTOR_P (fn)
238 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
241 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
242 basetype = TREE_TYPE (TREE_VALUE (arg_types));
243 arg_types = TREE_CHAIN (arg_types);
245 parms = DECL_CHAIN (DECL_ARGUMENTS (fn));
247 /* If this is a subobject constructor or destructor, our caller will
248 pass us a pointer to our VTT. */
249 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
251 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
253 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
254 DECL_CHAIN (parm) = parms;
257 /* ...and then to TYPE_ARG_TYPES. */
258 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
260 DECL_HAS_VTT_PARM_P (fn) = 1;
263 /* Then add the in-charge parm (before the VTT parm). */
264 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
265 DECL_CHAIN (parm) = parms;
267 arg_types = hash_tree_chain (integer_type_node, arg_types);
269 /* Insert our new parameter(s) into the list. */
270 DECL_CHAIN (DECL_ARGUMENTS (fn)) = parms;
272 /* And rebuild the function type. */
273 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
275 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
276 fntype = build_exception_variant (fntype,
277 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
278 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
279 fntype = (cp_build_type_attribute_variant
280 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
281 TREE_TYPE (fn) = fntype;
283 /* Now we've got the in-charge parameter. */
284 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
287 /* Classes overload their constituent function names automatically.
288 When a function name is declared in a record structure,
289 its name is changed to it overloaded name. Since names for
290 constructors and destructors can conflict, we place a leading
293 CNAME is the name of the class we are grokking for.
295 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
297 FLAGS contains bits saying what's special about today's
298 arguments. DTOR_FLAG == DESTRUCTOR.
300 If FUNCTION is a destructor, then we must add the `auto-delete' field
301 as a second parameter. There is some hair associated with the fact
302 that we must "declare" this variable in the manner consistent with the
303 way the rest of the arguments were declared.
305 QUALS are the qualifiers for the this pointer. */
308 grokclassfn (tree ctype, tree function, enum overload_flags flags)
310 tree fn_name = DECL_NAME (function);
312 /* Even within an `extern "C"' block, members get C++ linkage. See
313 [dcl.link] for details. */
314 SET_DECL_LANGUAGE (function, lang_cplusplus);
316 if (fn_name == NULL_TREE)
318 error ("name missing for member function");
319 fn_name = get_identifier ("<anonymous>");
320 DECL_NAME (function) = fn_name;
323 DECL_CONTEXT (function) = ctype;
325 if (flags == DTOR_FLAG)
326 DECL_DESTRUCTOR_P (function) = 1;
328 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
329 maybe_retrofit_in_chrg (function);
332 /* Create an ARRAY_REF, checking for the user doing things backwards
336 grok_array_decl (tree array_expr, tree index_exp)
340 tree orig_array_expr = array_expr;
341 tree orig_index_exp = index_exp;
343 if (error_operand_p (array_expr) || error_operand_p (index_exp))
344 return error_mark_node;
346 if (processing_template_decl)
348 if (type_dependent_expression_p (array_expr)
349 || type_dependent_expression_p (index_exp))
350 return build_min_nt (ARRAY_REF, array_expr, index_exp,
351 NULL_TREE, NULL_TREE);
352 array_expr = build_non_dependent_expr (array_expr);
353 index_exp = build_non_dependent_expr (index_exp);
356 type = TREE_TYPE (array_expr);
358 type = non_reference (type);
360 /* If they have an `operator[]', use that. */
361 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
362 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
363 array_expr, index_exp, NULL_TREE,
364 /*overload=*/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,
422 tsubst_flags_t complain)
426 if (exp == error_mark_node)
429 if (processing_template_decl)
431 t = build_min (DELETE_EXPR, void_type_node, exp, size);
432 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
433 DELETE_EXPR_USE_VEC (t) = doing_vec;
434 TREE_SIDE_EFFECTS (t) = 1;
438 /* An array can't have been allocated by new, so complain. */
439 if (TREE_CODE (exp) == VAR_DECL
440 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
441 warning (0, "deleting array %q#D", exp);
443 t = build_expr_type_conversion (WANT_POINTER, exp, true);
445 if (t == NULL_TREE || t == error_mark_node)
447 error ("type %q#T argument given to %<delete%>, expected pointer",
449 return error_mark_node;
452 type = TREE_TYPE (t);
454 /* As of Valley Forge, you can delete a pointer to const. */
456 /* You can't delete functions. */
457 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
459 error ("cannot delete a function. Only pointer-to-objects are "
460 "valid arguments to %<delete%>");
461 return error_mark_node;
464 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
465 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
467 warning (0, "deleting %qT is undefined", type);
471 /* Deleting a pointer with the value zero is valid and has no effect. */
472 if (integer_zerop (t))
473 return build1 (NOP_EXPR, void_type_node, t);
476 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
477 sfk_deleting_destructor,
478 use_global_delete, complain);
480 return build_delete (type, t, sfk_deleting_destructor,
481 LOOKUP_NORMAL, use_global_delete,
485 /* Report an error if the indicated template declaration is not the
486 sort of thing that should be a member template. */
489 check_member_template (tree tmpl)
493 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
494 decl = DECL_TEMPLATE_RESULT (tmpl);
496 if (TREE_CODE (decl) == FUNCTION_DECL
497 || (TREE_CODE (decl) == TYPE_DECL
498 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
500 /* The parser rejects template declarations in local classes. */
501 gcc_assert (!current_function_decl);
502 /* The parser rejects any use of virtual in a function template. */
503 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
504 && DECL_VIRTUAL_P (decl)));
506 /* The debug-information generating code doesn't know what to do
507 with member templates. */
508 DECL_IGNORED_P (tmpl) = 1;
511 error ("template declaration of %q#D", decl);
514 /* Return true iff TYPE is a valid Java parameter or return type. */
517 acceptable_java_type (tree type)
519 if (type == error_mark_node)
522 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
524 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
526 type = TREE_TYPE (type);
527 if (TREE_CODE (type) == RECORD_TYPE)
530 if (! TYPE_FOR_JAVA (type))
532 if (! CLASSTYPE_TEMPLATE_INFO (type))
534 args = CLASSTYPE_TI_ARGS (type);
535 i = TREE_VEC_LENGTH (args);
538 type = TREE_VEC_ELT (args, i);
539 if (TREE_CODE (type) == POINTER_TYPE)
540 type = TREE_TYPE (type);
541 if (! TYPE_FOR_JAVA (type))
550 /* For a METHOD in a Java class CTYPE, return true if
551 the parameter and return types are valid Java types.
552 Otherwise, print appropriate error messages, and return false. */
555 check_java_method (tree method)
558 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
559 tree ret_type = TREE_TYPE (TREE_TYPE (method));
561 if (!acceptable_java_type (ret_type))
563 error ("Java method %qD has non-Java return type %qT",
568 arg_types = TREE_CHAIN (arg_types);
569 if (DECL_HAS_IN_CHARGE_PARM_P (method))
570 arg_types = TREE_CHAIN (arg_types);
571 if (DECL_HAS_VTT_PARM_P (method))
572 arg_types = TREE_CHAIN (arg_types);
574 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
576 tree type = TREE_VALUE (arg_types);
577 if (!acceptable_java_type (type))
579 if (type != error_mark_node)
580 error ("Java method %qD has non-Java parameter type %qT",
588 /* Sanity check: report error if this function FUNCTION is not
589 really a member of the class (CTYPE) it is supposed to belong to.
590 TEMPLATE_PARMS is used to specify the template parameters of a member
591 template passed as FUNCTION_DECL. If the member template is passed as a
592 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
593 from the declaration. If the function is not a function template, it
595 It returns the original declaration for the function, NULL_TREE if
596 no declaration was found, error_mark_node if an error was emitted. */
599 check_classfn (tree ctype, tree function, tree template_parms)
605 if (DECL_USE_TEMPLATE (function)
606 && !(TREE_CODE (function) == TEMPLATE_DECL
607 && DECL_TEMPLATE_SPECIALIZATION (function))
608 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
609 /* Since this is a specialization of a member template,
610 we're not going to find the declaration in the class.
613 struct S { template <typename T> void f(T); };
614 template <> void S::f(int);
616 we're not going to find `S::f(int)', but there's no
617 reason we should, either. We let our callers know we didn't
618 find the method, but we don't complain. */
621 /* Basic sanity check: for a template function, the template parameters
622 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
623 if (TREE_CODE (function) == TEMPLATE_DECL)
626 && !comp_template_parms (template_parms,
627 DECL_TEMPLATE_PARMS (function)))
629 error ("template parameter lists provided don%'t match the "
630 "template parameters of %qD", function);
631 return error_mark_node;
633 template_parms = DECL_TEMPLATE_PARMS (function);
636 /* OK, is this a definition of a member template? */
637 is_template = (template_parms != NULL_TREE);
639 /* We must enter the scope here, because conversion operators are
640 named by target type, and type equivalence relies on typenames
641 resolving within the scope of CTYPE. */
642 pushed_scope = push_scope (ctype);
643 ix = class_method_index_for_fn (complete_type (ctype), function);
646 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
647 tree fndecls, fndecl = 0;
649 const char *format = NULL;
651 for (fndecls = VEC_index (tree, methods, ix);
652 fndecls; fndecls = OVL_NEXT (fndecls))
656 fndecl = OVL_CURRENT (fndecls);
657 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
658 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
660 /* We cannot simply call decls_match because this doesn't
661 work for static member functions that are pretending to
662 be methods, and because the name may have been changed by
665 /* Get rid of the this parameter on functions that become
667 if (DECL_STATIC_FUNCTION_P (fndecl)
668 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
669 p1 = TREE_CHAIN (p1);
671 /* A member template definition only matches a member template
673 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
676 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
677 TREE_TYPE (TREE_TYPE (fndecl)))
678 && compparms (p1, p2)
680 || comp_template_parms (template_parms,
681 DECL_TEMPLATE_PARMS (fndecl)))
682 && (DECL_TEMPLATE_SPECIALIZATION (function)
683 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
684 && (!DECL_TEMPLATE_SPECIALIZATION (function)
685 || (DECL_TI_TEMPLATE (function)
686 == DECL_TI_TEMPLATE (fndecl))))
692 pop_scope (pushed_scope);
693 return OVL_CURRENT (fndecls);
696 error_at (DECL_SOURCE_LOCATION (function),
697 "prototype for %q#D does not match any in class %qT",
699 is_conv_op = DECL_CONV_FN_P (fndecl);
702 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
703 fndecls = VEC_index (tree, methods, ix);
706 fndecl = OVL_CURRENT (fndecls);
707 fndecls = OVL_NEXT (fndecls);
709 if (!fndecls && is_conv_op)
711 if (VEC_length (tree, methods) > (size_t) ++ix)
713 fndecls = VEC_index (tree, methods, ix);
714 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
726 format = N_("candidates are: %+#D");
728 format = N_("candidate is: %+#D");
729 error (format, fndecl);
732 else if (!COMPLETE_TYPE_P (ctype))
733 cxx_incomplete_type_error (function, ctype);
735 error ("no %q#D member function declared in class %qT",
739 pop_scope (pushed_scope);
740 return error_mark_node;
743 /* DECL is a function with vague linkage. Remember it so that at the
744 end of the translation unit we can decide whether or not to emit
748 note_vague_linkage_fn (tree decl)
750 DECL_DEFER_OUTPUT (decl) = 1;
751 VEC_safe_push (tree, gc, deferred_fns, decl);
754 /* We have just processed the DECL, which is a static data member.
755 The other parameters are as for cp_finish_decl. */
758 finish_static_data_member_decl (tree decl,
759 tree init, bool init_const_expr_p,
763 DECL_CONTEXT (decl) = current_class_type;
765 /* We cannot call pushdecl here, because that would fill in the
766 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
767 the right thing, namely, to put this decl out straight away. */
769 if (! processing_template_decl)
770 VEC_safe_push (tree, gc, pending_statics, decl);
772 if (LOCAL_CLASS_P (current_class_type))
773 permerror (input_location, "local class %q#T shall not have static data member %q#D",
774 current_class_type, decl);
776 DECL_IN_AGGR_P (decl) = 1;
778 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
779 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
780 SET_VAR_HAD_UNKNOWN_BOUND (decl);
782 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
785 /* DECLARATOR and DECLSPECS correspond to a class member. The other
786 parameters are as for cp_finish_decl. Return the DECL for the
787 class member declared. */
790 grokfield (const cp_declarator *declarator,
791 cp_decl_specifier_seq *declspecs,
792 tree init, bool init_const_expr_p,
797 const char *asmspec = 0;
802 && TREE_CODE (init) == TREE_LIST
803 && TREE_VALUE (init) == error_mark_node
804 && TREE_CHAIN (init) == NULL_TREE)
807 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
808 if (! value || error_operand_p (value))
809 /* friend or constructor went bad. */
810 return error_mark_node;
812 if (TREE_CODE (value) == TYPE_DECL && init)
814 error ("typedef %qD is initialized (use decltype instead)", value);
818 /* Pass friendly classes back. */
819 if (value == void_type_node)
822 /* Pass friend decls back. */
823 if ((TREE_CODE (value) == FUNCTION_DECL
824 || TREE_CODE (value) == TEMPLATE_DECL)
825 && DECL_CONTEXT (value) != current_class_type)
828 name = DECL_NAME (value);
830 if (name != NULL_TREE)
832 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
834 error ("explicit template argument list not allowed");
835 return error_mark_node;
838 if (IDENTIFIER_POINTER (name)[0] == '_'
839 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
840 error ("member %qD conflicts with virtual function table field name",
844 /* Stash away type declarations. */
845 if (TREE_CODE (value) == TYPE_DECL)
847 DECL_NONLOCAL (value) = 1;
848 DECL_CONTEXT (value) = current_class_type;
850 if (processing_template_decl)
851 value = push_template_decl (value);
857 /* If this is a typedef that names the class for linkage purposes
858 (7.1.3p8), apply any attributes directly to the type. */
859 if (TAGGED_TYPE_P (TREE_TYPE (value))
860 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
861 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
863 cplus_decl_attributes (&value, attrlist, attrflags);
866 if (declspecs->specs[(int)ds_typedef]
867 && TREE_TYPE (value) != error_mark_node
868 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
869 set_underlying_type (value);
871 record_locally_defined_typedef (value);
875 if (DECL_IN_AGGR_P (value))
877 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
878 return void_type_node;
881 if (asmspec_tree && asmspec_tree != error_mark_node)
882 asmspec = TREE_STRING_POINTER (asmspec_tree);
886 if (TREE_CODE (value) == FUNCTION_DECL)
888 /* Initializers for functions are rejected early in the parser.
889 If we get here, it must be a pure specifier for a method. */
890 if (init == ridpointers[(int)RID_DELETE])
892 DECL_DELETED_FN (value) = 1;
893 DECL_DECLARED_INLINE_P (value) = 1;
894 DECL_INITIAL (value) = error_mark_node;
896 else if (init == ridpointers[(int)RID_DEFAULT])
898 if (defaultable_fn_check (value))
900 DECL_DEFAULTED_FN (value) = 1;
901 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
902 DECL_DECLARED_INLINE_P (value) = 1;
905 else if (TREE_CODE (init) == DEFAULT_ARG)
906 error ("invalid initializer for member function %qD", value);
907 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
909 if (integer_zerop (init))
910 DECL_PURE_VIRTUAL_P (value) = 1;
911 else if (error_operand_p (init))
912 ; /* An error has already been reported. */
914 error ("invalid initializer for member function %qD",
919 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
920 error ("initializer specified for static member function %qD",
924 else if (TREE_CODE (value) == FIELD_DECL)
925 /* C++11 NSDMI, keep going. */;
926 else if (TREE_CODE (value) != VAR_DECL)
928 else if (!processing_template_decl)
930 if (TREE_CODE (init) == CONSTRUCTOR)
931 init = digest_init (TREE_TYPE (value), init, tf_warning_or_error);
932 init = maybe_constant_init (init);
934 if (init != error_mark_node && !TREE_CONSTANT (init))
936 /* We can allow references to things that are effectively
937 static, since references are initialized with the
939 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
940 || (TREE_STATIC (init) == 0
941 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
943 error ("field initializer is not constant");
944 init = error_mark_node;
950 if (processing_template_decl
951 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
953 value = push_template_decl (value);
954 if (error_operand_p (value))
955 return error_mark_node;
959 cplus_decl_attributes (&value, attrlist, 0);
961 if (init && BRACE_ENCLOSED_INITIALIZER_P (init)
962 && CONSTRUCTOR_IS_DIRECT_INIT (init))
963 flags = LOOKUP_NORMAL;
965 flags = LOOKUP_IMPLICIT;
967 switch (TREE_CODE (value))
970 finish_static_data_member_decl (value, init, init_const_expr_p,
971 asmspec_tree, flags);
976 error ("%<asm%> specifiers are not permitted on non-static data members");
977 if (DECL_INITIAL (value) == error_mark_node)
978 init = error_mark_node;
979 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
981 DECL_IN_AGGR_P (value) = 1;
986 set_user_assembler_name (value, asmspec);
988 cp_finish_decl (value,
990 /*init_const_expr_p=*/false,
991 asmspec_tree, flags);
993 /* Pass friends back this way. */
994 if (DECL_FRIEND_P (value))
995 return void_type_node;
997 DECL_IN_AGGR_P (value) = 1;
1006 /* Like `grokfield', but for bitfields.
1007 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1010 grokbitfield (const cp_declarator *declarator,
1011 cp_decl_specifier_seq *declspecs, tree width,
1014 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1016 if (value == error_mark_node)
1017 return NULL_TREE; /* friends went bad. */
1019 /* Pass friendly classes back. */
1020 if (TREE_CODE (value) == VOID_TYPE)
1021 return void_type_node;
1023 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
1024 && (POINTER_TYPE_P (value)
1025 || !dependent_type_p (TREE_TYPE (value))))
1027 error ("bit-field %qD with non-integral type", value);
1028 return error_mark_node;
1031 if (TREE_CODE (value) == TYPE_DECL)
1033 error ("cannot declare %qD to be a bit-field type", value);
1037 /* Usually, finish_struct_1 catches bitfields with invalid types.
1038 But, in the case of bitfields with function type, we confuse
1039 ourselves into thinking they are member functions, so we must
1041 if (TREE_CODE (value) == FUNCTION_DECL)
1043 error ("cannot declare bit-field %qD with function type",
1048 if (DECL_IN_AGGR_P (value))
1050 error ("%qD is already defined in the class %qT", value,
1051 DECL_CONTEXT (value));
1052 return void_type_node;
1055 if (TREE_STATIC (value))
1057 error ("static member %qD cannot be a bit-field", value);
1060 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1062 if (width != error_mark_node)
1064 /* The width must be an integer type. */
1065 if (!type_dependent_expression_p (width)
1066 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width)))
1067 error ("width of bit-field %qD has non-integral type %qT", value,
1069 DECL_INITIAL (value) = width;
1070 SET_DECL_C_BIT_FIELD (value);
1073 DECL_IN_AGGR_P (value) = 1;
1076 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1082 /* Returns true iff ATTR is an attribute which needs to be applied at
1083 instantiation time rather than template definition time. */
1086 is_late_template_attribute (tree attr, tree decl)
1088 tree name = TREE_PURPOSE (attr);
1089 tree args = TREE_VALUE (attr);
1090 const struct attribute_spec *spec = lookup_attribute_spec (name);
1094 /* Unknown attribute. */
1097 /* Attribute weak handling wants to write out assembly right away. */
1098 if (is_attribute_p ("weak", name))
1101 /* If any of the arguments are dependent expressions, we can't evaluate
1102 the attribute until instantiation time. */
1103 for (arg = args; arg; arg = TREE_CHAIN (arg))
1105 tree t = TREE_VALUE (arg);
1107 /* If the first attribute argument is an identifier, only consider
1108 second and following arguments. Attributes like mode, format,
1109 cleanup and several target specific attributes aren't late
1110 just because they have an IDENTIFIER_NODE as first argument. */
1111 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1114 if (value_dependent_expression_p (t)
1115 || type_dependent_expression_p (t))
1119 if (TREE_CODE (decl) == TYPE_DECL
1121 || spec->type_required)
1123 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1125 /* We can't apply any attributes to a completely unknown type until
1126 instantiation time. */
1127 enum tree_code code = TREE_CODE (type);
1128 if (code == TEMPLATE_TYPE_PARM
1129 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1130 || code == TYPENAME_TYPE)
1132 /* Also defer most attributes on dependent types. This is not
1133 necessary in all cases, but is the better default. */
1134 else if (dependent_type_p (type)
1135 /* But attribute visibility specifically works on
1137 && !is_attribute_p ("visibility", name))
1146 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1147 applied at instantiation time and return them. If IS_DEPENDENT is true,
1148 the declaration itself is dependent, so all attributes should be applied
1149 at instantiation time. */
1152 splice_template_attributes (tree *attr_p, tree decl)
1155 tree late_attrs = NULL_TREE;
1156 tree *q = &late_attrs;
1163 if (is_late_template_attribute (*p, decl))
1165 ATTR_IS_DEPENDENT (*p) = 1;
1167 *p = TREE_CHAIN (*p);
1168 q = &TREE_CHAIN (*q);
1172 p = &TREE_CHAIN (*p);
1178 /* Remove any late attributes from the list in ATTR_P and attach them to
1182 save_template_attributes (tree *attr_p, tree *decl_p)
1184 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1186 tree old_attrs = NULL_TREE;
1191 if (DECL_P (*decl_p))
1192 q = &DECL_ATTRIBUTES (*decl_p);
1194 q = &TYPE_ATTRIBUTES (*decl_p);
1198 /* Place the late attributes at the beginning of the attribute
1200 TREE_CHAIN (tree_last (late_attrs)) = *q;
1203 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1205 /* We've added new attributes directly to the main variant, so
1206 now we need to update all of the other variants to include
1207 these new attributes. */
1209 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1210 variant = TYPE_NEXT_VARIANT (variant))
1212 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1213 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1218 /* Like reconstruct_complex_type, but handle also template trees. */
1221 cp_reconstruct_complex_type (tree type, tree bottom)
1225 if (TREE_CODE (type) == POINTER_TYPE)
1227 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1228 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1229 TYPE_REF_CAN_ALIAS_ALL (type));
1231 else if (TREE_CODE (type) == REFERENCE_TYPE)
1233 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1234 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1235 TYPE_REF_CAN_ALIAS_ALL (type));
1237 else if (TREE_CODE (type) == ARRAY_TYPE)
1239 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1240 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1241 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1242 element type qualification will be handled by the recursive
1243 cp_reconstruct_complex_type call and cp_build_qualified_type
1244 for ARRAY_TYPEs changes the element type. */
1247 else if (TREE_CODE (type) == FUNCTION_TYPE)
1249 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1250 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1251 outer = apply_memfn_quals (outer, type_memfn_quals (type));
1253 else if (TREE_CODE (type) == METHOD_TYPE)
1255 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1256 /* The build_method_type_directly() routine prepends 'this' to argument list,
1257 so we must compensate by getting rid of it. */
1259 = build_method_type_directly
1260 (class_of_this_parm (type), inner,
1261 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1263 else if (TREE_CODE (type) == OFFSET_TYPE)
1265 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1266 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1271 if (TYPE_ATTRIBUTES (type))
1272 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1273 return cp_build_qualified_type (outer, cp_type_quals (type));
1276 /* Replaces any constexpr expression that may be into the attributes
1277 arguments with their reduced value. */
1280 cp_check_const_attributes (tree attributes)
1283 for (attr = attributes; attr; attr = TREE_CHAIN (attr))
1286 for (arg = TREE_VALUE (attr); arg; arg = TREE_CHAIN (arg))
1288 tree expr = TREE_VALUE (arg);
1290 TREE_VALUE (arg) = maybe_constant_value (expr);
1295 /* Like decl_attributes, but handle C++ complexity. */
1298 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1300 if (*decl == NULL_TREE || *decl == void_type_node
1301 || *decl == error_mark_node
1302 || attributes == NULL_TREE)
1305 if (processing_template_decl)
1307 if (check_for_bare_parameter_packs (attributes))
1310 save_template_attributes (&attributes, decl);
1311 if (attributes == NULL_TREE)
1315 cp_check_const_attributes (attributes);
1317 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1318 decl = &DECL_TEMPLATE_RESULT (*decl);
1320 decl_attributes (decl, attributes, flags);
1322 if (TREE_CODE (*decl) == TYPE_DECL)
1323 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1326 /* Walks through the namespace- or function-scope anonymous union
1327 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1328 Returns one of the fields for use in the mangled name. */
1331 build_anon_union_vars (tree type, tree object)
1333 tree main_decl = NULL_TREE;
1336 /* Rather than write the code to handle the non-union case,
1337 just give an error. */
1338 if (TREE_CODE (type) != UNION_TYPE)
1340 error ("anonymous struct not inside named type");
1341 return error_mark_node;
1344 for (field = TYPE_FIELDS (type);
1346 field = DECL_CHAIN (field))
1351 if (DECL_ARTIFICIAL (field))
1353 if (TREE_CODE (field) != FIELD_DECL)
1355 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1356 "have non-static data members", field);
1360 if (TREE_PRIVATE (field))
1361 permerror (input_location, "private member %q+#D in anonymous union", field);
1362 else if (TREE_PROTECTED (field))
1363 permerror (input_location, "protected member %q+#D in anonymous union", field);
1365 if (processing_template_decl)
1366 ref = build_min_nt (COMPONENT_REF, object,
1367 DECL_NAME (field), NULL_TREE);
1369 ref = build_class_member_access_expr (object, field, NULL_TREE,
1370 false, tf_warning_or_error);
1372 if (DECL_NAME (field))
1376 decl = build_decl (input_location,
1377 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1378 DECL_ANON_UNION_VAR_P (decl) = 1;
1379 DECL_ARTIFICIAL (decl) = 1;
1381 base = get_base_address (object);
1382 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1383 TREE_STATIC (decl) = TREE_STATIC (base);
1384 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1386 SET_DECL_VALUE_EXPR (decl, ref);
1387 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1389 decl = pushdecl (decl);
1391 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1392 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1396 if (main_decl == NULL_TREE)
1403 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1404 anonymous union, then all members must be laid out together. PUBLIC_P
1405 is nonzero if this union is not declared static. */
1408 finish_anon_union (tree anon_union_decl)
1414 if (anon_union_decl == error_mark_node)
1417 type = TREE_TYPE (anon_union_decl);
1418 public_p = TREE_PUBLIC (anon_union_decl);
1420 /* The VAR_DECL's context is the same as the TYPE's context. */
1421 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1423 if (TYPE_FIELDS (type) == NULL_TREE)
1428 error ("namespace-scope anonymous aggregates must be static");
1432 main_decl = build_anon_union_vars (type, anon_union_decl);
1433 if (main_decl == error_mark_node)
1435 if (main_decl == NULL_TREE)
1437 warning (0, "anonymous union with no members");
1441 if (!processing_template_decl)
1443 /* Use main_decl to set the mangled name. */
1444 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1445 maybe_commonize_var (anon_union_decl);
1446 if (TREE_STATIC (anon_union_decl) || DECL_EXTERNAL (anon_union_decl))
1447 mangle_decl (anon_union_decl);
1448 DECL_NAME (anon_union_decl) = NULL_TREE;
1451 pushdecl (anon_union_decl);
1452 if (building_stmt_list_p ()
1453 && at_function_scope_p ())
1454 add_decl_expr (anon_union_decl);
1455 else if (!processing_template_decl)
1456 rest_of_decl_compilation (anon_union_decl,
1457 toplevel_bindings_p (), at_eof);
1460 /* Auxiliary functions to make type signatures for
1461 `operator new' and `operator delete' correspond to
1462 what compiler will be expecting. */
1465 coerce_new_type (tree type)
1468 tree args = TYPE_ARG_TYPES (type);
1470 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1472 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1475 error ("%<operator new%> must return type %qT", ptr_type_node);
1478 if (args && args != void_list_node)
1480 if (TREE_PURPOSE (args))
1482 /* [basic.stc.dynamic.allocation]
1484 The first parameter shall not have an associated default
1486 error ("the first parameter of %<operator new%> cannot "
1487 "have a default argument");
1488 /* Throw away the default argument. */
1489 TREE_PURPOSE (args) = NULL_TREE;
1492 if (!same_type_p (TREE_VALUE (args), size_type_node))
1495 args = TREE_CHAIN (args);
1502 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1503 "as first parameter", size_type_node);
1508 args = tree_cons (NULL_TREE, size_type_node, args);
1511 type = build_exception_variant
1512 (build_function_type (ptr_type_node, args),
1513 TYPE_RAISES_EXCEPTIONS (type));
1521 coerce_delete_type (tree type)
1524 tree args = TYPE_ARG_TYPES (type);
1526 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1528 if (!same_type_p (TREE_TYPE (type), void_type_node))
1531 error ("%<operator delete%> must return type %qT", void_type_node);
1534 if (!args || args == void_list_node
1535 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1538 if (args && args != void_list_node)
1539 args = TREE_CHAIN (args);
1540 error ("%<operator delete%> takes type %qT as first parameter",
1546 args = tree_cons (NULL_TREE, ptr_type_node, args);
1549 type = build_exception_variant
1550 (build_function_type (void_type_node, args),
1551 TYPE_RAISES_EXCEPTIONS (type));
1559 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1560 and mark them as needed. */
1563 mark_vtable_entries (tree decl)
1566 unsigned HOST_WIDE_INT idx;
1568 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1573 STRIP_NOPS (fnaddr);
1575 if (TREE_CODE (fnaddr) != ADDR_EXPR
1576 && TREE_CODE (fnaddr) != FDESC_EXPR)
1577 /* This entry is an offset: a virtual base class offset, a
1578 virtual call offset, an RTTI offset, etc. */
1581 fn = TREE_OPERAND (fnaddr, 0);
1582 TREE_ADDRESSABLE (fn) = 1;
1583 /* When we don't have vcall offsets, we output thunks whenever
1584 we output the vtables that contain them. With vcall offsets,
1585 we know all the thunks we'll need when we emit a virtual
1586 function, so we emit the thunks there instead. */
1587 if (DECL_THUNK_P (fn))
1588 use_thunk (fn, /*emit_p=*/0);
1593 /* Set DECL up to have the closest approximation of "initialized common"
1594 linkage available. */
1597 comdat_linkage (tree decl)
1600 make_decl_one_only (decl, cxx_comdat_group (decl));
1601 else if (TREE_CODE (decl) == FUNCTION_DECL
1602 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1603 /* We can just emit function and compiler-generated variables
1604 statically; having multiple copies is (for the most part) only
1607 There are two correctness issues, however: the address of a
1608 template instantiation with external linkage should be the
1609 same, independent of what translation unit asks for the
1610 address, and this will not hold when we emit multiple copies of
1611 the function. However, there's little else we can do.
1613 Also, by default, the typeinfo implementation assumes that
1614 there will be only one copy of the string used as the name for
1615 each type. Therefore, if weak symbols are unavailable, the
1616 run-time library should perform a more conservative check; it
1617 should perform a string comparison, rather than an address
1619 TREE_PUBLIC (decl) = 0;
1622 /* Static data member template instantiations, however, cannot
1623 have multiple copies. */
1624 if (DECL_INITIAL (decl) == 0
1625 || DECL_INITIAL (decl) == error_mark_node)
1626 DECL_COMMON (decl) = 1;
1627 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1629 DECL_COMMON (decl) = 1;
1630 DECL_INITIAL (decl) = error_mark_node;
1632 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1634 /* We can't do anything useful; leave vars for explicit
1636 DECL_EXTERNAL (decl) = 1;
1637 DECL_NOT_REALLY_EXTERN (decl) = 0;
1641 DECL_COMDAT (decl) = 1;
1644 /* For win32 we also want to put explicit instantiations in
1645 linkonce sections, so that they will be merged with implicit
1646 instantiations; otherwise we get duplicate symbol errors.
1647 For Darwin we do not want explicit instantiations to be
1651 maybe_make_one_only (tree decl)
1653 /* We used to say that this was not necessary on targets that support weak
1654 symbols, because the implicit instantiations will defer to the explicit
1655 one. However, that's not actually the case in SVR4; a strong definition
1656 after a weak one is an error. Also, not making explicit
1657 instantiations one_only means that we can end up with two copies of
1658 some template instantiations. */
1662 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1663 we can get away with not emitting them if they aren't used. We need
1664 to for variables so that cp_finish_decl will update their linkage,
1665 because their DECL_INITIAL may not have been set properly yet. */
1667 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1668 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1669 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1671 make_decl_one_only (decl, cxx_comdat_group (decl));
1673 if (TREE_CODE (decl) == VAR_DECL)
1675 DECL_COMDAT (decl) = 1;
1676 /* Mark it needed so we don't forget to emit it. */
1677 mark_decl_referenced (decl);
1682 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1683 This predicate will give the right answer during parsing of the
1684 function, which other tests may not. */
1687 vague_linkage_p (tree decl)
1689 /* Unfortunately, import_export_decl has not always been called
1690 before the function is processed, so we cannot simply check
1692 return (DECL_COMDAT (decl)
1693 || (((TREE_CODE (decl) == FUNCTION_DECL
1694 && DECL_DECLARED_INLINE_P (decl))
1695 || (DECL_LANG_SPECIFIC (decl)
1696 && DECL_TEMPLATE_INSTANTIATION (decl)))
1697 && TREE_PUBLIC (decl)));
1700 /* Determine whether or not we want to specifically import or export CTYPE,
1701 using various heuristics. */
1704 import_export_class (tree ctype)
1706 /* -1 for imported, 1 for exported. */
1707 int import_export = 0;
1709 /* It only makes sense to call this function at EOF. The reason is
1710 that this function looks at whether or not the first non-inline
1711 non-abstract virtual member function has been defined in this
1712 translation unit. But, we can't possibly know that until we've
1713 seen the entire translation unit. */
1714 gcc_assert (at_eof);
1716 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1719 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1720 we will have CLASSTYPE_INTERFACE_ONLY set but not
1721 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1722 heuristic because someone will supply a #pragma implementation
1723 elsewhere, and deducing it here would produce a conflict. */
1724 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1727 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1729 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1731 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1732 && !flag_implicit_templates)
1733 /* For a template class, without -fimplicit-templates, check the
1734 repository. If the virtual table is assigned to this
1735 translation unit, then export the class; otherwise, import
1737 import_export = repo_export_class_p (ctype) ? 1 : -1;
1738 else if (TYPE_POLYMORPHIC_P (ctype))
1740 /* The ABI specifies that the virtual table and associated
1741 information are emitted with the key method, if any. */
1742 tree method = CLASSTYPE_KEY_METHOD (ctype);
1743 /* If weak symbol support is not available, then we must be
1744 careful not to emit the vtable when the key function is
1745 inline. An inline function can be defined in multiple
1746 translation units. If we were to emit the vtable in each
1747 translation unit containing a definition, we would get
1748 multiple definition errors at link-time. */
1749 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1750 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1753 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1754 a definition anywhere else. */
1755 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1758 /* Allow back ends the chance to overrule the decision. */
1759 if (targetm.cxx.import_export_class)
1760 import_export = targetm.cxx.import_export_class (ctype, import_export);
1764 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1765 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1769 /* Return true if VAR has already been provided to the back end; in that
1770 case VAR should not be modified further by the front end. */
1772 var_finalized_p (tree var)
1774 return varpool_node (var)->finalized;
1777 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1778 must be emitted in this translation unit. Mark it as such. */
1781 mark_needed (tree decl)
1783 /* It's possible that we no longer need to set
1784 TREE_SYMBOL_REFERENCED here directly, but doing so is
1786 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1787 mark_decl_referenced (decl);
1790 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1791 returns true if a definition of this entity should be provided in
1792 this object file. Callers use this function to determine whether
1793 or not to let the back end know that a definition of DECL is
1794 available in this translation unit. */
1797 decl_needed_p (tree decl)
1799 gcc_assert (TREE_CODE (decl) == VAR_DECL
1800 || TREE_CODE (decl) == FUNCTION_DECL);
1801 /* This function should only be called at the end of the translation
1802 unit. We cannot be sure of whether or not something will be
1803 COMDAT until that point. */
1804 gcc_assert (at_eof);
1806 /* All entities with external linkage that are not COMDAT should be
1807 emitted; they may be referred to from other object files. */
1808 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1810 /* If this entity was used, let the back end see it; it will decide
1811 whether or not to emit it into the object file. */
1812 if (TREE_USED (decl)
1813 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1814 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1816 /* Functions marked "dllexport" must be emitted so that they are
1817 visible to other DLLs. */
1818 if (flag_keep_inline_dllexport
1819 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1821 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1822 reference to DECL might cause it to be emitted later. */
1826 /* If necessary, write out the vtables for the dynamic class CTYPE.
1827 Returns true if any vtables were emitted. */
1830 maybe_emit_vtables (tree ctype)
1835 struct varpool_node *current = NULL, *last = NULL, *first = NULL;
1837 /* If the vtables for this class have already been emitted there is
1838 nothing more to do. */
1839 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1840 if (var_finalized_p (primary_vtbl))
1842 /* Ignore dummy vtables made by get_vtable_decl. */
1843 if (TREE_TYPE (primary_vtbl) == void_type_node)
1846 /* On some targets, we cannot determine the key method until the end
1847 of the translation unit -- which is when this function is
1849 if (!targetm.cxx.key_method_may_be_inline ())
1850 determine_key_method (ctype);
1852 /* See if any of the vtables are needed. */
1853 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1855 import_export_decl (vtbl);
1856 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1861 /* If the references to this class' vtables are optimized away,
1862 still emit the appropriate debugging information. See
1864 if (DECL_COMDAT (primary_vtbl)
1865 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1866 note_debug_info_needed (ctype);
1870 /* The ABI requires that we emit all of the vtables if we emit any
1872 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1874 /* Mark entities references from the virtual table as used. */
1875 mark_vtable_entries (vtbl);
1877 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1879 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1881 /* It had better be all done at compile-time. */
1886 DECL_EXTERNAL (vtbl) = 0;
1887 rest_of_decl_compilation (vtbl, 1, 1);
1889 /* Because we're only doing syntax-checking, we'll never end up
1890 actually marking the variable as written. */
1891 if (flag_syntax_only)
1892 TREE_ASM_WRITTEN (vtbl) = 1;
1893 else if (DECL_COMDAT (vtbl))
1895 current = varpool_node (vtbl);
1897 last->same_comdat_group = current;
1905 last->same_comdat_group = first;
1907 /* Since we're writing out the vtable here, also write the debug
1909 note_debug_info_needed (ctype);
1914 /* A special return value from type_visibility meaning internal
1917 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1919 /* walk_tree helper function for type_visibility. */
1922 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1924 int *vis_p = (int *)data;
1929 else if (CLASS_TYPE_P (*tp))
1931 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1933 *vis_p = VISIBILITY_ANON;
1936 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1937 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1942 /* Returns the visibility of TYPE, which is the minimum visibility of its
1946 type_visibility (tree type)
1948 int vis = VISIBILITY_DEFAULT;
1949 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1953 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1954 specified (or if VISIBILITY is static). */
1957 constrain_visibility (tree decl, int visibility)
1959 if (visibility == VISIBILITY_ANON)
1961 /* extern "C" declarations aren't affected by the anonymous
1963 if (!DECL_EXTERN_C_P (decl))
1965 TREE_PUBLIC (decl) = 0;
1966 DECL_WEAK (decl) = 0;
1967 DECL_COMMON (decl) = 0;
1968 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1969 DECL_INTERFACE_KNOWN (decl) = 1;
1970 if (DECL_LANG_SPECIFIC (decl))
1971 DECL_NOT_REALLY_EXTERN (decl) = 1;
1974 else if (visibility > DECL_VISIBILITY (decl)
1975 && !DECL_VISIBILITY_SPECIFIED (decl))
1977 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1983 /* Constrain the visibility of DECL based on the visibility of its template
1987 constrain_visibility_for_template (tree decl, tree targs)
1989 /* If this is a template instantiation, check the innermost
1990 template args for visibility constraints. The outer template
1991 args are covered by the class check. */
1992 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1994 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1998 tree arg = TREE_VEC_ELT (args, i-1);
2000 vis = type_visibility (arg);
2001 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
2004 if (TREE_CODE (arg) == ADDR_EXPR)
2005 arg = TREE_OPERAND (arg, 0);
2006 if (TREE_CODE (arg) == VAR_DECL
2007 || TREE_CODE (arg) == FUNCTION_DECL)
2009 if (! TREE_PUBLIC (arg))
2010 vis = VISIBILITY_ANON;
2012 vis = DECL_VISIBILITY (arg);
2016 constrain_visibility (decl, vis);
2020 /* Like c_determine_visibility, but with additional C++-specific
2023 Function-scope entities can rely on the function's visibility because
2024 it is set in start_preparsed_function.
2026 Class-scope entities cannot rely on the class's visibility until the end
2027 of the enclosing class definition.
2029 Note that because namespaces have multiple independent definitions,
2030 namespace visibility is handled elsewhere using the #pragma visibility
2031 machinery rather than by decorating the namespace declaration.
2033 The goal is for constraints from the type to give a diagnostic, and
2034 other constraints to be applied silently. */
2037 determine_visibility (tree decl)
2039 tree class_type = NULL_TREE;
2041 bool orig_visibility_specified;
2042 enum symbol_visibility orig_visibility;
2044 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2046 /* Only relevant for names with external linkage. */
2047 if (!TREE_PUBLIC (decl))
2050 /* Cloned constructors and destructors get the same visibility as
2051 the underlying function. That should be set up in
2052 maybe_clone_body. */
2053 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2055 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2056 orig_visibility = DECL_VISIBILITY (decl);
2058 if (TREE_CODE (decl) == TYPE_DECL)
2060 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2061 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2062 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2067 else if (DECL_LANG_SPECIFIC (decl))
2068 use_template = DECL_USE_TEMPLATE (decl);
2072 /* If DECL is a member of a class, visibility specifiers on the
2073 class can influence the visibility of the DECL. */
2074 if (DECL_CLASS_SCOPE_P (decl))
2075 class_type = DECL_CONTEXT (decl);
2078 /* Not a class member. */
2080 /* Virtual tables have DECL_CONTEXT set to their associated class,
2081 so they are automatically handled above. */
2082 gcc_assert (TREE_CODE (decl) != VAR_DECL
2083 || !DECL_VTABLE_OR_VTT_P (decl));
2085 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2087 /* Local statics and classes get the visibility of their
2088 containing function by default, except that
2089 -fvisibility-inlines-hidden doesn't affect them. */
2090 tree fn = DECL_CONTEXT (decl);
2091 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2093 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2094 DECL_VISIBILITY_SPECIFIED (decl) =
2095 DECL_VISIBILITY_SPECIFIED (fn);
2098 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2100 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2101 but have no TEMPLATE_INFO, so don't try to check it. */
2104 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2105 && flag_visibility_ms_compat)
2107 /* Under -fvisibility-ms-compat, types are visible by default,
2108 even though their contents aren't. */
2109 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2110 int underlying_vis = type_visibility (underlying_type);
2111 if (underlying_vis == VISIBILITY_ANON
2112 || (CLASS_TYPE_P (underlying_type)
2113 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type)))
2114 constrain_visibility (decl, underlying_vis);
2116 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2118 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2120 /* tinfo visibility is based on the type it's for. */
2121 constrain_visibility
2122 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2124 /* Give the target a chance to override the visibility associated
2126 if (TREE_PUBLIC (decl)
2127 && !DECL_REALLY_EXTERN (decl)
2128 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2129 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2130 targetm.cxx.determine_class_data_visibility (decl);
2132 else if (use_template)
2133 /* Template instantiations and specializations get visibility based
2134 on their template unless they override it with an attribute. */;
2135 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2137 /* Set default visibility to whatever the user supplied with
2138 #pragma GCC visibility or a namespace visibility attribute. */
2139 DECL_VISIBILITY (decl) = default_visibility;
2140 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2146 /* If the specialization doesn't specify visibility, use the
2147 visibility from the template. */
2148 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2149 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2150 : DECL_TEMPLATE_INFO (decl));
2151 tree args = TI_ARGS (tinfo);
2153 if (args != error_mark_node)
2155 int depth = TMPL_ARGS_DEPTH (args);
2156 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2158 if (!DECL_VISIBILITY_SPECIFIED (decl))
2160 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2161 DECL_VISIBILITY_SPECIFIED (decl)
2162 = DECL_VISIBILITY_SPECIFIED (pattern);
2165 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2166 if (args && depth > template_class_depth (class_type))
2167 /* Limit visibility based on its template arguments. */
2168 constrain_visibility_for_template (decl, args);
2173 determine_visibility_from_class (decl, class_type);
2175 if (decl_anon_ns_mem_p (decl))
2176 /* Names in an anonymous namespace get internal linkage.
2177 This might change once we implement export. */
2178 constrain_visibility (decl, VISIBILITY_ANON);
2179 else if (TREE_CODE (decl) != TYPE_DECL)
2181 /* Propagate anonymity from type to decl. */
2182 int tvis = type_visibility (TREE_TYPE (decl));
2183 if (tvis == VISIBILITY_ANON
2184 || ! DECL_VISIBILITY_SPECIFIED (decl))
2185 constrain_visibility (decl, tvis);
2187 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2188 /* DR 757: A type without linkage shall not be used as the type of a
2189 variable or function with linkage, unless
2190 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2191 o the variable or function is not used (3.2 [basic.def.odr]) or is
2192 defined in the same translation unit.
2194 Since non-extern "C" decls need to be defined in the same
2195 translation unit, we can make the type internal. */
2196 constrain_visibility (decl, VISIBILITY_ANON);
2198 /* If visibility changed and DECL already has DECL_RTL, ensure
2199 symbol flags are updated. */
2200 if ((DECL_VISIBILITY (decl) != orig_visibility
2201 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2202 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2203 || TREE_CODE (decl) == FUNCTION_DECL)
2204 && DECL_RTL_SET_P (decl))
2205 make_decl_rtl (decl);
2208 /* By default, static data members and function members receive
2209 the visibility of their containing class. */
2212 determine_visibility_from_class (tree decl, tree class_type)
2214 if (DECL_VISIBILITY_SPECIFIED (decl))
2217 if (visibility_options.inlines_hidden
2218 /* Don't do this for inline templates; specializations might not be
2219 inline, and we don't want them to inherit the hidden
2220 visibility. We'll set it here for all inline instantiations. */
2221 && !processing_template_decl
2222 && TREE_CODE (decl) == FUNCTION_DECL
2223 && DECL_DECLARED_INLINE_P (decl)
2224 && (! DECL_LANG_SPECIFIC (decl)
2225 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2226 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2229 /* Default to the class visibility. */
2230 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2231 DECL_VISIBILITY_SPECIFIED (decl)
2232 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2235 /* Give the target a chance to override the visibility associated
2237 if (TREE_CODE (decl) == VAR_DECL
2238 && (DECL_TINFO_P (decl)
2239 || (DECL_VTABLE_OR_VTT_P (decl)
2240 /* Construction virtual tables are not exported because
2241 they cannot be referred to from other object files;
2242 their name is not standardized by the ABI. */
2243 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2244 && TREE_PUBLIC (decl)
2245 && !DECL_REALLY_EXTERN (decl)
2246 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2247 targetm.cxx.determine_class_data_visibility (decl);
2250 /* Constrain the visibility of a class TYPE based on the visibility of its
2251 field types. Warn if any fields require lesser visibility. */
2254 constrain_class_visibility (tree type)
2260 int vis = type_visibility (type);
2262 if (vis == VISIBILITY_ANON
2263 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2266 /* Don't warn about visibility if the class has explicit visibility. */
2267 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2268 vis = VISIBILITY_INTERNAL;
2270 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
2271 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2273 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2274 int subvis = type_visibility (ftype);
2276 if (subvis == VISIBILITY_ANON)
2278 if (!in_main_input_context ())
2280 %qT has a field %qD whose type uses the anonymous namespace",
2283 else if (MAYBE_CLASS_TYPE_P (ftype)
2284 && vis < VISIBILITY_HIDDEN
2285 && subvis >= VISIBILITY_HIDDEN)
2286 warning (OPT_Wattributes, "\
2287 %qT declared with greater visibility than the type of its field %qD",
2291 binfo = TYPE_BINFO (type);
2292 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2294 int subvis = type_visibility (TREE_TYPE (t));
2296 if (subvis == VISIBILITY_ANON)
2298 if (!in_main_input_context())
2300 %qT has a base %qT whose type uses the anonymous namespace",
2301 type, TREE_TYPE (t));
2303 else if (vis < VISIBILITY_HIDDEN
2304 && subvis >= VISIBILITY_HIDDEN)
2305 warning (OPT_Wattributes, "\
2306 %qT declared with greater visibility than its base %qT",
2307 type, TREE_TYPE (t));
2311 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2312 for DECL has not already been determined, do so now by setting
2313 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2314 function is called entities with vague linkage whose definitions
2315 are available must have TREE_PUBLIC set.
2317 If this function decides to place DECL in COMDAT, it will set
2318 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2319 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2320 callers defer that decision until it is clear that DECL is actually
2324 import_export_decl (tree decl)
2329 tree class_type = NULL_TREE;
2331 if (DECL_INTERFACE_KNOWN (decl))
2334 /* We cannot determine what linkage to give to an entity with vague
2335 linkage until the end of the file. For example, a virtual table
2336 for a class will be defined if and only if the key method is
2337 defined in this translation unit. As a further example, consider
2338 that when compiling a translation unit that uses PCH file with
2339 "-frepo" it would be incorrect to make decisions about what
2340 entities to emit when building the PCH; those decisions must be
2341 delayed until the repository information has been processed. */
2342 gcc_assert (at_eof);
2343 /* Object file linkage for explicit instantiations is handled in
2344 mark_decl_instantiated. For static variables in functions with
2345 vague linkage, maybe_commonize_var is used.
2347 Therefore, the only declarations that should be provided to this
2348 function are those with external linkage that are:
2350 * implicit instantiations of function templates
2354 * implicit instantiations of static data members of class
2361 Furthermore, all entities that reach this point must have a
2362 definition available in this translation unit.
2364 The following assertions check these conditions. */
2365 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2366 || TREE_CODE (decl) == VAR_DECL);
2367 /* Any code that creates entities with TREE_PUBLIC cleared should
2368 also set DECL_INTERFACE_KNOWN. */
2369 gcc_assert (TREE_PUBLIC (decl));
2370 if (TREE_CODE (decl) == FUNCTION_DECL)
2371 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2372 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2373 || DECL_DECLARED_INLINE_P (decl));
2375 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2376 || DECL_VTABLE_OR_VTT_P (decl)
2377 || DECL_TINFO_P (decl));
2378 /* Check that a definition of DECL is available in this translation
2380 gcc_assert (!DECL_REALLY_EXTERN (decl));
2382 /* Assume that DECL will not have COMDAT linkage. */
2384 /* Assume that DECL will not be imported into this translation
2388 /* See if the repository tells us whether or not to emit DECL in
2389 this translation unit. */
2390 emit_p = repo_emit_p (decl);
2393 else if (emit_p == 1)
2395 /* The repository indicates that this entity should be defined
2396 here. Make sure the back end honors that request. */
2397 if (TREE_CODE (decl) == VAR_DECL)
2399 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2400 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2403 FOR_EACH_CLONE (clone, decl)
2404 mark_needed (clone);
2408 /* Output the definition as an ordinary strong definition. */
2409 DECL_EXTERNAL (decl) = 0;
2410 DECL_INTERFACE_KNOWN (decl) = 1;
2415 /* We have already decided what to do with this DECL; there is no
2416 need to check anything further. */
2418 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2420 class_type = DECL_CONTEXT (decl);
2421 import_export_class (class_type);
2422 if (TYPE_FOR_JAVA (class_type))
2424 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2425 && CLASSTYPE_INTERFACE_ONLY (class_type))
2427 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2428 && !CLASSTYPE_USE_TEMPLATE (class_type)
2429 && CLASSTYPE_KEY_METHOD (class_type)
2430 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2431 /* The ABI requires that all virtual tables be emitted with
2432 COMDAT linkage. However, on systems where COMDAT symbols
2433 don't show up in the table of contents for a static
2434 archive, or on systems without weak symbols (where we
2435 approximate COMDAT linkage by using internal linkage), the
2436 linker will report errors about undefined symbols because
2437 it will not see the virtual table definition. Therefore,
2438 in the case that we know that the virtual table will be
2439 emitted in only one translation unit, we make the virtual
2440 table an ordinary definition with external linkage. */
2441 DECL_EXTERNAL (decl) = 0;
2442 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2444 /* CLASS_TYPE is being exported from this translation unit,
2445 so DECL should be defined here. */
2446 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2447 /* If a class is declared in a header with the "extern
2448 template" extension, then it will not be instantiated,
2449 even in translation units that would normally require
2450 it. Often such classes are explicitly instantiated in
2451 one translation unit. Therefore, the explicit
2452 instantiation must be made visible to other translation
2454 DECL_EXTERNAL (decl) = 0;
2457 /* The generic C++ ABI says that class data is always
2458 COMDAT, even if there is a key function. Some
2459 variants (e.g., the ARM EABI) says that class data
2460 only has COMDAT linkage if the class data might be
2461 emitted in more than one translation unit. When the
2462 key method can be inline and is inline, we still have
2463 to arrange for comdat even though
2464 class_data_always_comdat is false. */
2465 if (!CLASSTYPE_KEY_METHOD (class_type)
2466 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2467 || targetm.cxx.class_data_always_comdat ())
2469 /* The ABI requires COMDAT linkage. Normally, we
2470 only emit COMDAT things when they are needed;
2471 make sure that we realize that this entity is
2478 else if (!flag_implicit_templates
2479 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2484 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2486 tree type = TREE_TYPE (DECL_NAME (decl));
2487 if (CLASS_TYPE_P (type))
2490 import_export_class (type);
2491 if (CLASSTYPE_INTERFACE_KNOWN (type)
2492 && TYPE_POLYMORPHIC_P (type)
2493 && CLASSTYPE_INTERFACE_ONLY (type)
2494 /* If -fno-rtti was specified, then we cannot be sure
2495 that RTTI information will be emitted with the
2496 virtual table of the class, so we must emit it
2497 wherever it is used. */
2502 if (CLASSTYPE_INTERFACE_KNOWN (type)
2503 && !CLASSTYPE_INTERFACE_ONLY (type))
2505 comdat_p = (targetm.cxx.class_data_always_comdat ()
2506 || (CLASSTYPE_KEY_METHOD (type)
2507 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2512 DECL_EXTERNAL (decl) = 0;
2522 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2523 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2525 /* DECL is an implicit instantiation of a function or static
2527 if ((flag_implicit_templates
2528 && !flag_use_repository)
2529 || (flag_implicit_inline_templates
2530 && TREE_CODE (decl) == FUNCTION_DECL
2531 && DECL_DECLARED_INLINE_P (decl)))
2534 /* If we are not implicitly generating templates, then mark
2535 this entity as undefined in this translation unit. */
2538 else if (DECL_FUNCTION_MEMBER_P (decl))
2540 if (!DECL_DECLARED_INLINE_P (decl))
2542 tree ctype = DECL_CONTEXT (decl);
2543 import_export_class (ctype);
2544 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2546 DECL_NOT_REALLY_EXTERN (decl)
2547 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2548 || (DECL_DECLARED_INLINE_P (decl)
2549 && ! flag_implement_inlines
2550 && !DECL_VINDEX (decl)));
2552 if (!DECL_NOT_REALLY_EXTERN (decl))
2553 DECL_EXTERNAL (decl) = 1;
2555 /* Always make artificials weak. */
2556 if (DECL_ARTIFICIAL (decl) && flag_weak)
2559 maybe_make_one_only (decl);
2570 /* If we are importing DECL into this translation unit, mark is
2571 an undefined here. */
2572 DECL_EXTERNAL (decl) = 1;
2573 DECL_NOT_REALLY_EXTERN (decl) = 0;
2577 /* If we decided to put DECL in COMDAT, mark it accordingly at
2579 comdat_linkage (decl);
2582 DECL_INTERFACE_KNOWN (decl) = 1;
2585 /* Return an expression that performs the destruction of DECL, which
2586 must be a VAR_DECL whose type has a non-trivial destructor, or is
2587 an array whose (innermost) elements have a non-trivial destructor. */
2590 build_cleanup (tree decl)
2593 tree type = TREE_TYPE (decl);
2595 /* This function should only be called for declarations that really
2596 require cleanups. */
2597 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2599 /* Treat all objects with destructors as used; the destructor may do
2600 something substantive. */
2603 if (TREE_CODE (type) == ARRAY_TYPE)
2606 temp = build_address (decl);
2607 temp = build_delete (TREE_TYPE (temp), temp,
2608 sfk_complete_destructor,
2609 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0,
2610 tf_warning_or_error);
2614 /* Returns the initialization guard variable for the variable DECL,
2615 which has static storage duration. */
2618 get_guard (tree decl)
2623 sname = mangle_guard_variable (decl);
2624 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2629 /* We use a type that is big enough to contain a mutex as well
2630 as an integer counter. */
2631 guard_type = targetm.cxx.guard_type ();
2632 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2633 VAR_DECL, sname, guard_type);
2635 /* The guard should have the same linkage as what it guards. */
2636 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2637 TREE_STATIC (guard) = TREE_STATIC (decl);
2638 DECL_COMMON (guard) = DECL_COMMON (decl);
2639 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2640 if (DECL_ONE_ONLY (decl))
2641 make_decl_one_only (guard, cxx_comdat_group (guard));
2642 if (TREE_PUBLIC (decl))
2643 DECL_WEAK (guard) = DECL_WEAK (decl);
2644 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2645 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2647 DECL_ARTIFICIAL (guard) = 1;
2648 DECL_IGNORED_P (guard) = 1;
2649 TREE_USED (guard) = 1;
2650 pushdecl_top_level_and_finish (guard, NULL_TREE);
2655 /* Return those bits of the GUARD variable that should be set when the
2656 guarded entity is actually initialized. */
2659 get_guard_bits (tree guard)
2661 if (!targetm.cxx.guard_mask_bit ())
2663 /* We only set the first byte of the guard, in order to leave room
2664 for a mutex in the high-order bits. */
2665 guard = build1 (ADDR_EXPR,
2666 build_pointer_type (TREE_TYPE (guard)),
2668 guard = build1 (NOP_EXPR,
2669 build_pointer_type (char_type_node),
2671 guard = build1 (INDIRECT_REF, char_type_node, guard);
2677 /* Return an expression which determines whether or not the GUARD
2678 variable has already been initialized. */
2681 get_guard_cond (tree guard)
2685 /* Check to see if the GUARD is zero. */
2686 guard = get_guard_bits (guard);
2688 /* Mask off all but the low bit. */
2689 if (targetm.cxx.guard_mask_bit ())
2691 guard_value = integer_one_node;
2692 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2693 guard_value = convert (TREE_TYPE (guard), guard_value);
2694 guard = cp_build_binary_op (input_location,
2695 BIT_AND_EXPR, guard, guard_value,
2696 tf_warning_or_error);
2699 guard_value = integer_zero_node;
2700 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2701 guard_value = convert (TREE_TYPE (guard), guard_value);
2702 return cp_build_binary_op (input_location,
2703 EQ_EXPR, guard, guard_value,
2704 tf_warning_or_error);
2707 /* Return an expression which sets the GUARD variable, indicating that
2708 the variable being guarded has been initialized. */
2711 set_guard (tree guard)
2715 /* Set the GUARD to one. */
2716 guard = get_guard_bits (guard);
2717 guard_init = integer_one_node;
2718 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2719 guard_init = convert (TREE_TYPE (guard), guard_init);
2720 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2721 tf_warning_or_error);
2724 /* Start the process of running a particular set of global constructors
2725 or destructors. Subroutine of do_[cd]tors. */
2728 start_objects (int method_type, int initp)
2734 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2736 if (initp != DEFAULT_INIT_PRIORITY)
2746 sprintf (type, "sub_%c%c%.5u", method_type, joiner, initp);
2749 sprintf (type, "sub_%c", method_type);
2751 fndecl = build_lang_decl (FUNCTION_DECL,
2752 get_file_function_name (type),
2753 build_function_type_list (void_type_node,
2755 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2757 TREE_PUBLIC (current_function_decl) = 0;
2759 /* Mark as artificial because it's not explicitly in the user's
2761 DECL_ARTIFICIAL (current_function_decl) = 1;
2763 /* Mark this declaration as used to avoid spurious warnings. */
2764 TREE_USED (current_function_decl) = 1;
2766 /* Mark this function as a global constructor or destructor. */
2767 if (method_type == 'I')
2768 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2770 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2772 body = begin_compound_stmt (BCS_FN_BODY);
2777 /* Finish the process of running a particular set of global constructors
2778 or destructors. Subroutine of do_[cd]tors. */
2781 finish_objects (int method_type, int initp, tree body)
2786 finish_compound_stmt (body);
2787 fn = finish_function (0);
2789 if (method_type == 'I')
2791 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2792 decl_init_priority_insert (fn, initp);
2796 DECL_STATIC_DESTRUCTOR (fn) = 1;
2797 decl_fini_priority_insert (fn, initp);
2800 expand_or_defer_fn (fn);
2803 /* The names of the parameters to the function created to handle
2804 initializations and destructions for objects with static storage
2806 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2807 #define PRIORITY_IDENTIFIER "__priority"
2809 /* The name of the function we create to handle initializations and
2810 destructions for objects with static storage duration. */
2811 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2813 /* The declaration for the __INITIALIZE_P argument. */
2814 static GTY(()) tree initialize_p_decl;
2816 /* The declaration for the __PRIORITY argument. */
2817 static GTY(()) tree priority_decl;
2819 /* The declaration for the static storage duration function. */
2820 static GTY(()) tree ssdf_decl;
2822 /* All the static storage duration functions created in this
2823 translation unit. */
2824 static GTY(()) VEC(tree,gc) *ssdf_decls;
2826 /* A map from priority levels to information about that priority
2827 level. There may be many such levels, so efficient lookup is
2829 static splay_tree priority_info_map;
2831 /* Begins the generation of the function that will handle all
2832 initialization and destruction of objects with static storage
2833 duration. The function generated takes two parameters of type
2834 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2835 nonzero, it performs initializations. Otherwise, it performs
2836 destructions. It only performs those initializations or
2837 destructions with the indicated __PRIORITY. The generated function
2840 It is assumed that this function will only be called once per
2841 translation unit. */
2844 start_static_storage_duration_function (unsigned count)
2848 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2850 /* Create the identifier for this function. It will be of the form
2851 SSDF_IDENTIFIER_<number>. */
2852 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2854 type = build_function_type_list (void_type_node,
2855 integer_type_node, integer_type_node,
2858 /* Create the FUNCTION_DECL itself. */
2859 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2860 get_identifier (id),
2862 TREE_PUBLIC (ssdf_decl) = 0;
2863 DECL_ARTIFICIAL (ssdf_decl) = 1;
2865 /* Put this function in the list of functions to be called from the
2866 static constructors and destructors. */
2869 ssdf_decls = VEC_alloc (tree, gc, 32);
2871 /* Take this opportunity to initialize the map from priority
2872 numbers to information about that priority level. */
2873 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2874 /*delete_key_fn=*/0,
2875 /*delete_value_fn=*/
2876 (splay_tree_delete_value_fn) &free);
2878 /* We always need to generate functions for the
2879 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2880 priorities later, we'll be sure to find the
2881 DEFAULT_INIT_PRIORITY. */
2882 get_priority_info (DEFAULT_INIT_PRIORITY);
2885 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2887 /* Create the argument list. */
2888 initialize_p_decl = cp_build_parm_decl
2889 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2890 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2891 TREE_USED (initialize_p_decl) = 1;
2892 priority_decl = cp_build_parm_decl
2893 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2894 DECL_CONTEXT (priority_decl) = ssdf_decl;
2895 TREE_USED (priority_decl) = 1;
2897 DECL_CHAIN (initialize_p_decl) = priority_decl;
2898 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2900 /* Put the function in the global scope. */
2901 pushdecl (ssdf_decl);
2903 /* Start the function itself. This is equivalent to declaring the
2906 static void __ssdf (int __initialize_p, init __priority_p);
2908 It is static because we only need to call this function from the
2909 various constructor and destructor functions for this module. */
2910 start_preparsed_function (ssdf_decl,
2911 /*attrs=*/NULL_TREE,
2914 /* Set up the scope of the outermost block in the function. */
2915 body = begin_compound_stmt (BCS_FN_BODY);
2920 /* Finish the generation of the function which performs initialization
2921 and destruction of objects with static storage duration. After
2922 this point, no more such objects can be created. */
2925 finish_static_storage_duration_function (tree body)
2927 /* Close out the function. */
2928 finish_compound_stmt (body);
2929 expand_or_defer_fn (finish_function (0));
2932 /* Return the information about the indicated PRIORITY level. If no
2933 code to handle this level has yet been generated, generate the
2934 appropriate prologue. */
2936 static priority_info
2937 get_priority_info (int priority)
2942 n = splay_tree_lookup (priority_info_map,
2943 (splay_tree_key) priority);
2946 /* Create a new priority information structure, and insert it
2948 pi = XNEW (struct priority_info_s);
2949 pi->initializations_p = 0;
2950 pi->destructions_p = 0;
2951 splay_tree_insert (priority_info_map,
2952 (splay_tree_key) priority,
2953 (splay_tree_value) pi);
2956 pi = (priority_info) n->value;
2961 /* The effective initialization priority of a DECL. */
2963 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2964 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2965 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2967 /* Whether a DECL needs a guard to protect it against multiple
2970 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2971 || DECL_ONE_ONLY (decl) \
2972 || DECL_WEAK (decl)))
2974 /* Called from one_static_initialization_or_destruction(),
2976 Walks the initializer list of a global variable and looks for
2977 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2978 and that have their DECL_CONTEXT() == NULL.
2979 For each such temporary variable, set their DECL_CONTEXT() to
2980 the current function. This is necessary because otherwise
2981 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2982 when trying to refer to a temporary variable that does not have
2983 it's DECL_CONTECT() properly set. */
2985 fix_temporary_vars_context_r (tree *node,
2986 int *unused ATTRIBUTE_UNUSED,
2987 void *unused1 ATTRIBUTE_UNUSED)
2989 gcc_assert (current_function_decl);
2991 if (TREE_CODE (*node) == BIND_EXPR)
2995 for (var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var))
2996 if (TREE_CODE (var) == VAR_DECL
2998 && DECL_ARTIFICIAL (var)
2999 && !DECL_CONTEXT (var))
3000 DECL_CONTEXT (var) = current_function_decl;
3006 /* Set up to handle the initialization or destruction of DECL. If
3007 INITP is nonzero, we are initializing the variable. Otherwise, we
3008 are destroying it. */
3011 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
3013 tree guard_if_stmt = NULL_TREE;
3016 /* If we are supposed to destruct and there's a trivial destructor,
3017 nothing has to be done. */
3019 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3022 /* Trick the compiler into thinking we are at the file and line
3023 where DECL was declared so that error-messages make sense, and so
3024 that the debugger will show somewhat sensible file and line
3026 input_location = DECL_SOURCE_LOCATION (decl);
3028 /* Make sure temporary variables in the initialiser all have
3029 their DECL_CONTEXT() set to a value different from NULL_TREE.
3030 This can happen when global variables initialisers are built.
3031 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3032 the temporary variables that might have been generated in the
3033 accompagning initialisers is NULL_TREE, meaning the variables have been
3034 declared in the global namespace.
3035 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3036 of the temporaries are set to the current function decl. */
3037 cp_walk_tree_without_duplicates (&init,
3038 fix_temporary_vars_context_r,
3045 Access control for implicit calls to the constructors,
3046 the conversion functions, or the destructor called to
3047 create and destroy a static data member is performed as
3048 if these calls appeared in the scope of the member's
3051 we pretend we are in a static member function of the class of
3052 which the DECL is a member. */
3053 if (member_p (decl))
3055 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3056 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3059 /* Assume we don't need a guard. */
3061 /* We need a guard if this is an object with external linkage that
3062 might be initialized in more than one place. (For example, a
3063 static data member of a template, when the data member requires
3065 if (NEEDS_GUARD_P (decl))
3069 guard = get_guard (decl);
3071 /* When using __cxa_atexit, we just check the GUARD as we would
3072 for a local static. */
3073 if (flag_use_cxa_atexit)
3075 /* When using __cxa_atexit, we never try to destroy
3076 anything from a static destructor. */
3078 guard_cond = get_guard_cond (guard);
3080 /* If we don't have __cxa_atexit, then we will be running
3081 destructors from .fini sections, or their equivalents. So,
3082 we need to know how many times we've tried to initialize this
3083 object. We do initializations only if the GUARD is zero,
3084 i.e., if we are the first to initialize the variable. We do
3085 destructions only if the GUARD is one, i.e., if we are the
3086 last to destroy the variable. */
3089 = cp_build_binary_op (input_location,
3091 cp_build_unary_op (PREINCREMENT_EXPR,
3094 tf_warning_or_error),
3096 tf_warning_or_error);
3099 = cp_build_binary_op (input_location,
3101 cp_build_unary_op (PREDECREMENT_EXPR,
3104 tf_warning_or_error),
3106 tf_warning_or_error);
3108 guard_if_stmt = begin_if_stmt ();
3109 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3113 /* If we're using __cxa_atexit, we have not already set the GUARD,
3114 so we must do so now. */
3115 if (guard && initp && flag_use_cxa_atexit)
3116 finish_expr_stmt (set_guard (guard));
3118 /* Perform the initialization or destruction. */
3122 finish_expr_stmt (init);
3124 /* If we're using __cxa_atexit, register a function that calls the
3125 destructor for the object. */
3126 if (flag_use_cxa_atexit)
3127 finish_expr_stmt (register_dtor_fn (decl));
3130 finish_expr_stmt (build_cleanup (decl));
3132 /* Finish the guard if-stmt, if necessary. */
3135 finish_then_clause (guard_if_stmt);
3136 finish_if_stmt (guard_if_stmt);
3139 /* Now that we're done with DECL we don't need to pretend to be a
3140 member of its class any longer. */
3141 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3142 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3145 /* Generate code to do the initialization or destruction of the decls in VARS,
3146 a TREE_LIST of VAR_DECL with static storage duration.
3147 Whether initialization or destruction is performed is specified by INITP. */
3150 do_static_initialization_or_destruction (tree vars, bool initp)
3152 tree node, init_if_stmt, cond;
3154 /* Build the outer if-stmt to check for initialization or destruction. */
3155 init_if_stmt = begin_if_stmt ();
3156 cond = initp ? integer_one_node : integer_zero_node;
3157 cond = cp_build_binary_op (input_location,
3161 tf_warning_or_error);
3162 finish_if_stmt_cond (cond, init_if_stmt);
3166 tree decl = TREE_VALUE (node);
3167 tree priority_if_stmt;
3171 /* If we don't need a destructor, there's nothing to do. Avoid
3172 creating a possibly empty if-stmt. */
3173 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3175 node = TREE_CHAIN (node);
3179 /* Remember that we had an initialization or finalization at this
3181 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3182 pi = get_priority_info (priority);
3184 pi->initializations_p = 1;
3186 pi->destructions_p = 1;
3188 /* Conditionalize this initialization on being in the right priority
3189 and being initializing/finalizing appropriately. */
3190 priority_if_stmt = begin_if_stmt ();
3191 cond = cp_build_binary_op (input_location,
3194 build_int_cst (NULL_TREE, priority),
3195 tf_warning_or_error);
3196 finish_if_stmt_cond (cond, priority_if_stmt);
3198 /* Process initializers with same priority. */
3200 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3201 node = TREE_CHAIN (node))
3202 /* Do one initialization or destruction. */
3203 one_static_initialization_or_destruction (TREE_VALUE (node),
3204 TREE_PURPOSE (node), initp);
3206 /* Finish up the priority if-stmt body. */
3207 finish_then_clause (priority_if_stmt);
3208 finish_if_stmt (priority_if_stmt);
3212 /* Finish up the init/destruct if-stmt body. */
3213 finish_then_clause (init_if_stmt);
3214 finish_if_stmt (init_if_stmt);
3217 /* VARS is a list of variables with static storage duration which may
3218 need initialization and/or finalization. Remove those variables
3219 that don't really need to be initialized or finalized, and return
3220 the resulting list. The order in which the variables appear in
3221 VARS is in reverse order of the order in which they should actually
3222 be initialized. The list we return is in the unreversed order;
3223 i.e., the first variable should be initialized first. */
3226 prune_vars_needing_no_initialization (tree *vars)
3229 tree result = NULL_TREE;
3234 tree decl = TREE_VALUE (t);
3235 tree init = TREE_PURPOSE (t);
3237 /* Deal gracefully with error. */
3238 if (decl == error_mark_node)
3240 var = &TREE_CHAIN (t);
3244 /* The only things that can be initialized are variables. */
3245 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3247 /* If this object is not defined, we don't need to do anything
3249 if (DECL_EXTERNAL (decl))
3251 var = &TREE_CHAIN (t);
3255 /* Also, if the initializer already contains errors, we can bail
3257 if (init && TREE_CODE (init) == TREE_LIST
3258 && value_member (error_mark_node, init))
3260 var = &TREE_CHAIN (t);
3264 /* This variable is going to need initialization and/or
3265 finalization, so we add it to the list. */
3266 *var = TREE_CHAIN (t);
3267 TREE_CHAIN (t) = result;
3274 /* Make sure we have told the back end about all the variables in
3278 write_out_vars (tree vars)
3282 for (v = vars; v; v = TREE_CHAIN (v))
3284 tree var = TREE_VALUE (v);
3285 if (!var_finalized_p (var))
3287 import_export_decl (var);
3288 rest_of_decl_compilation (var, 1, 1);
3293 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3294 (otherwise) that will initialize all global objects with static
3295 storage duration having the indicated PRIORITY. */
3298 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3306 input_location = *locus;
3308 /* Was: locus->line++; */
3310 /* We use `I' to indicate initialization and `D' to indicate
3312 function_key = constructor_p ? 'I' : 'D';
3314 /* We emit the function lazily, to avoid generating empty
3315 global constructors and destructors. */
3318 /* For Objective-C++, we may need to initialize metadata found in this module.
3319 This must be done _before_ any other static initializations. */
3320 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3321 && constructor_p && objc_static_init_needed_p ())
3323 body = start_objects (function_key, priority);
3324 objc_generate_static_init_call (NULL_TREE);
3327 /* Call the static storage duration function with appropriate
3329 FOR_EACH_VEC_ELT (tree, ssdf_decls, i, fndecl)
3331 /* Calls to pure or const functions will expand to nothing. */
3332 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3337 body = start_objects (function_key, priority);
3339 call = cp_build_function_call_nary (fndecl, tf_warning_or_error,
3340 build_int_cst (NULL_TREE,
3342 build_int_cst (NULL_TREE,
3345 finish_expr_stmt (call);
3349 /* Close out the function. */
3351 finish_objects (function_key, priority, body);
3354 /* Generate constructor and destructor functions for the priority
3358 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3360 location_t *locus = (location_t *) data;
3361 int priority = (int) n->key;
3362 priority_info pi = (priority_info) n->value;
3364 /* Generate the functions themselves, but only if they are really
3366 if (pi->initializations_p)
3367 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3368 if (pi->destructions_p)
3369 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3371 /* Keep iterating. */
3375 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3376 decls referenced from front-end specific constructs; it will be called
3377 only for language-specific tree nodes.
3379 Here we must deal with member pointers. */
3382 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3386 switch (TREE_CODE (t))
3389 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3390 cgraph_mark_address_taken_node (
3391 cgraph_get_create_node (PTRMEM_CST_MEMBER (t)));
3394 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3395 cgraph_mark_address_taken_node (
3396 cgraph_get_create_node (BASELINK_FUNCTIONS (t)));
3399 if (DECL_CONTEXT (t)
3400 && flag_use_repository
3401 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3402 /* If we need a static variable in a function, then we
3403 need the containing function. */
3404 mark_decl_referenced (DECL_CONTEXT (t));
3413 /* Java requires that we be able to reference a local address for a
3414 method, and not be confused by PLT entries. If hidden aliases are
3415 supported, collect and return all the functions for which we should
3416 emit a hidden alias. */
3418 static struct pointer_set_t *
3419 collect_candidates_for_java_method_aliases (void)
3421 struct cgraph_node *node;
3422 struct pointer_set_t *candidates = NULL;
3424 #ifndef HAVE_GAS_HIDDEN
3428 for (node = cgraph_nodes; node ; node = node->next)
3430 tree fndecl = node->decl;
3432 if (DECL_CONTEXT (fndecl)
3433 && TYPE_P (DECL_CONTEXT (fndecl))
3434 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3435 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3437 if (candidates == NULL)
3438 candidates = pointer_set_create ();
3439 pointer_set_insert (candidates, fndecl);
3447 /* Java requires that we be able to reference a local address for a
3448 method, and not be confused by PLT entries. If hidden aliases are
3449 supported, emit one for each java function that we've emitted.
3450 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3451 by collect_candidates_for_java_method_aliases. */
3454 build_java_method_aliases (struct pointer_set_t *candidates)
3456 struct cgraph_node *node;
3458 #ifndef HAVE_GAS_HIDDEN
3462 for (node = cgraph_nodes; node ; node = node->next)
3464 tree fndecl = node->decl;
3466 if (TREE_ASM_WRITTEN (fndecl)
3467 && pointer_set_contains (candidates, fndecl))
3469 /* Mangle the name in a predictable way; we need to reference
3470 this from a java compiled object file. */
3471 tree oid, nid, alias;
3475 oid = DECL_ASSEMBLER_NAME (fndecl);
3476 oname = IDENTIFIER_POINTER (oid);
3477 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3478 nname = ACONCAT (("_ZGA", oname+2, NULL));
3479 nid = get_identifier (nname);
3481 alias = make_alias_for (fndecl, nid);
3482 TREE_PUBLIC (alias) = 1;
3483 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3485 assemble_alias (alias, oid);
3490 /* Return C++ property of T, based on given operation OP. */
3493 cpp_check (tree t, cpp_operation op)
3498 return DECL_PURE_VIRTUAL_P (t);
3499 case IS_CONSTRUCTOR:
3500 return DECL_CONSTRUCTOR_P (t);
3502 return DECL_DESTRUCTOR_P (t);
3503 case IS_COPY_CONSTRUCTOR:
3504 return DECL_COPY_CONSTRUCTOR_P (t);
3506 return TREE_CODE (t) == TEMPLATE_DECL;
3512 /* Collect source file references recursively, starting from NAMESPC. */
3515 collect_source_refs (tree namespc)
3522 /* Iterate over names in this name space. */
3523 for (t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
3524 if (!DECL_IS_BUILTIN (t) )
3525 collect_source_ref (DECL_SOURCE_FILE (t));
3527 /* Dump siblings, if any */
3528 collect_source_refs (TREE_CHAIN (namespc));
3530 /* Dump children, if any */
3531 collect_source_refs (NAMESPACE_LEVEL (namespc)->namespaces);
3534 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
3535 starting from NAMESPC. */
3538 collect_ada_namespace (tree namespc, const char *source_file)
3543 /* Collect decls from this namespace */
3544 collect_ada_nodes (NAMESPACE_LEVEL (namespc)->names, source_file);
3546 /* Collect siblings, if any */
3547 collect_ada_namespace (TREE_CHAIN (namespc), source_file);
3549 /* Collect children, if any */
3550 collect_ada_namespace (NAMESPACE_LEVEL (namespc)->namespaces, source_file);
3553 /* Returns true iff there is a definition available for variable or
3557 decl_defined_p (tree decl)
3559 if (TREE_CODE (decl) == FUNCTION_DECL)
3560 return (DECL_INITIAL (decl) != NULL_TREE);
3563 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3564 return !DECL_EXTERNAL (decl);
3568 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
3572 An integral constant-expression can only involve ... const
3573 variables of integral or enumeration types initialized with
3574 constant expressions ...
3576 C++0x also allows constexpr variables and temporaries initialized
3577 with constant expressions. We handle the former here, but the latter
3578 are just folded away in cxx_eval_constant_expression.
3580 The standard does not require that the expression be non-volatile.
3581 G++ implements the proposed correction in DR 457. */
3584 decl_constant_var_p (tree decl)
3586 if (!decl_maybe_constant_var_p (decl))
3589 /* We don't know if a template static data member is initialized with
3590 a constant expression until we instantiate its initializer. Even
3591 in the case of a constexpr variable, we can't treat it as a
3592 constant until its initializer is complete in case it's used in
3593 its own initializer. */
3595 return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl);
3598 /* Returns true if DECL could be a symbolic constant variable, depending on
3602 decl_maybe_constant_var_p (tree decl)
3604 tree type = TREE_TYPE (decl);
3605 if (TREE_CODE (decl) != VAR_DECL)
3607 if (DECL_DECLARED_CONSTEXPR_P (decl))
3609 return (CP_TYPE_CONST_NON_VOLATILE_P (type)
3610 && INTEGRAL_OR_ENUMERATION_TYPE_P (type));
3613 /* Complain that DECL uses a type with no linkage but is never defined. */
3616 no_linkage_error (tree decl)
3618 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3619 if (TYPE_ANONYMOUS_P (t))
3621 permerror (0, "%q+#D, declared using anonymous type, "
3622 "is used but never defined", decl);
3623 if (is_typedef_decl (TYPE_NAME (t)))
3624 permerror (0, "%q+#D does not refer to the unqualified type, "
3625 "so it is not used for linkage", TYPE_NAME (t));
3628 permerror (0, "%q+#D, declared using local type %qT, "
3629 "is used but never defined", decl, t);
3632 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
3635 collect_all_refs (const char *source_file)
3637 collect_ada_namespace (global_namespace, source_file);
3640 /* Clear DECL_EXTERNAL for NODE. */
3643 clear_decl_external (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED)
3645 DECL_EXTERNAL (node->decl) = 0;
3649 /* This routine is called at the end of compilation.
3650 Its job is to create all the code needed to initialize and
3651 destroy the global aggregates. We do the destruction
3652 first, since that way we only need to reverse the decls once. */
3655 cp_write_global_declarations (void)
3661 unsigned ssdf_count = 0;
3664 struct pointer_set_t *candidates;
3666 locus = input_location;
3669 /* Bad parse errors. Just forget about it. */
3670 if (! global_bindings_p () || current_class_type
3671 || !VEC_empty (tree,decl_namespace_list))
3675 c_common_write_pch ();
3677 cgraph_process_same_body_aliases ();
3679 /* Handle -fdump-ada-spec[-slim] */
3680 if (dump_enabled_p (TDI_ada))
3682 if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM)
3683 collect_source_ref (main_input_filename);
3685 collect_source_refs (global_namespace);
3687 dump_ada_specs (collect_all_refs, cpp_check);
3690 /* FIXME - huh? was input_line -= 1;*/
3692 timevar_start (TV_PHASE_DEFERRED);
3694 /* We now have to write out all the stuff we put off writing out.
3697 o Template specializations that we have not yet instantiated,
3698 but which are needed.
3699 o Initialization and destruction for non-local objects with
3700 static storage duration. (Local objects with static storage
3701 duration are initialized when their scope is first entered,
3702 and are cleaned up via atexit.)
3703 o Virtual function tables.
3705 All of these may cause others to be needed. For example,
3706 instantiating one function may cause another to be needed, and
3707 generating the initializer for an object may cause templates to be
3708 instantiated, etc., etc. */
3710 emit_support_tinfos ();
3719 /* If there are templates that we've put off instantiating, do
3721 instantiate_pending_templates (retries);
3724 /* Write out virtual tables as required. Note that writing out
3725 the virtual table for a template class may cause the
3726 instantiation of members of that class. If we write out
3727 vtables then we remove the class from our list so we don't
3728 have to look at it again. */
3730 while (keyed_classes != NULL_TREE
3731 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3734 keyed_classes = TREE_CHAIN (keyed_classes);
3740 tree next = TREE_CHAIN (t);
3744 if (maybe_emit_vtables (TREE_VALUE (next)))
3747 TREE_CHAIN (t) = TREE_CHAIN (next);
3752 next = TREE_CHAIN (t);
3756 /* Write out needed type info variables. We have to be careful
3757 looping through unemitted decls, because emit_tinfo_decl may
3758 cause other variables to be needed. New elements will be
3759 appended, and we remove from the vector those that actually
3761 for (i = VEC_length (tree, unemitted_tinfo_decls);
3762 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3763 if (emit_tinfo_decl (t))
3766 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3769 /* The list of objects with static storage duration is built up
3770 in reverse order. We clear STATIC_AGGREGATES so that any new
3771 aggregates added during the initialization of these will be
3772 initialized in the correct order when we next come around the
3774 vars = prune_vars_needing_no_initialization (&static_aggregates);
3778 /* We need to start a new initialization function each time
3779 through the loop. That's because we need to know which
3780 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3781 isn't computed until a function is finished, and written
3782 out. That's a deficiency in the back end. When this is
3783 fixed, these initialization functions could all become
3784 inline, with resulting performance improvements. */
3787 /* Set the line and file, so that it is obviously not from
3789 input_location = locus;
3790 ssdf_body = start_static_storage_duration_function (ssdf_count);
3792 /* Make sure the back end knows about all the variables. */
3793 write_out_vars (vars);
3795 /* First generate code to do all the initializations. */
3797 do_static_initialization_or_destruction (vars, /*initp=*/true);
3799 /* Then, generate code to do all the destructions. Do these
3800 in reverse order so that the most recently constructed
3801 variable is the first destroyed. If we're using
3802 __cxa_atexit, then we don't need to do this; functions
3803 were registered at initialization time to destroy the
3805 if (!flag_use_cxa_atexit && vars)
3807 vars = nreverse (vars);
3808 do_static_initialization_or_destruction (vars, /*initp=*/false);
3813 /* Finish up the static storage duration function for this
3815 input_location = locus;
3816 finish_static_storage_duration_function (ssdf_body);
3818 /* All those initializations and finalizations might cause
3819 us to need more inline functions, more template
3820 instantiations, etc. */
3823 /* ??? was: locus.line++; */
3826 /* Go through the set of inline functions whose bodies have not
3827 been emitted yet. If out-of-line copies of these functions
3828 are required, emit them. */
3829 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3831 /* Does it need synthesizing? */
3832 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3833 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3835 /* Even though we're already at the top-level, we push
3836 there again. That way, when we pop back a few lines
3837 hence, all of our state is restored. Otherwise,
3838 finish_function doesn't clean things up, and we end
3839 up with CURRENT_FUNCTION_DECL set. */
3840 push_to_top_level ();
3841 /* The decl's location will mark where it was first
3842 needed. Save that so synthesize method can indicate
3843 where it was needed from, in case of error */
3844 input_location = DECL_SOURCE_LOCATION (decl);
3845 synthesize_method (decl);
3846 pop_from_top_level ();
3850 if (!DECL_SAVED_TREE (decl))
3853 /* We lie to the back end, pretending that some functions
3854 are not defined when they really are. This keeps these
3855 functions from being put out unnecessarily. But, we must
3856 stop lying when the functions are referenced, or if they
3857 are not comdat since they need to be put out now. If
3858 DECL_INTERFACE_KNOWN, then we have already set
3859 DECL_EXTERNAL appropriately, so there's no need to check
3860 again, and we do not want to clear DECL_EXTERNAL if a
3861 previous call to import_export_decl set it.
3863 This is done in a separate for cycle, because if some
3864 deferred function is contained in another deferred
3865 function later in deferred_fns varray,
3866 rest_of_compilation would skip this function and we
3867 really cannot expand the same function twice. */
3868 import_export_decl (decl);
3869 if (DECL_NOT_REALLY_EXTERN (decl)
3870 && DECL_INITIAL (decl)
3871 && decl_needed_p (decl))
3873 struct cgraph_node *node, *next;
3875 node = cgraph_get_node (decl);
3876 if (node->same_body_alias)
3877 node = cgraph_alias_aliased_node (node);
3879 cgraph_for_node_and_aliases (node, clear_decl_external,
3881 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3882 group, we need to mark all symbols in the same comdat group
3884 if (node->same_comdat_group)
3885 for (next = node->same_comdat_group;
3887 next = next->same_comdat_group)
3888 cgraph_for_node_and_aliases (next, clear_decl_external,
3892 /* If we're going to need to write this function out, and
3893 there's already a body for it, create RTL for it now.
3894 (There might be no body if this is a method we haven't
3895 gotten around to synthesizing yet.) */
3896 if (!DECL_EXTERNAL (decl)
3897 && decl_needed_p (decl)
3898 && !TREE_ASM_WRITTEN (decl)
3899 && !cgraph_get_node (decl)->local.finalized)
3901 /* We will output the function; no longer consider it in this
3903 DECL_DEFER_OUTPUT (decl) = 0;
3904 /* Generate RTL for this function now that we know we
3906 expand_or_defer_fn (decl);
3907 /* If we're compiling -fsyntax-only pretend that this
3908 function has been written out so that we don't try to
3910 if (flag_syntax_only)
3911 TREE_ASM_WRITTEN (decl) = 1;
3916 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3919 /* Static data members are just like namespace-scope globals. */
3920 FOR_EACH_VEC_ELT (tree, pending_statics, i, decl)
3922 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3923 /* Don't write it out if we haven't seen a definition. */
3924 || DECL_IN_AGGR_P (decl))
3926 import_export_decl (decl);
3927 /* If this static data member is needed, provide it to the
3929 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3930 DECL_EXTERNAL (decl) = 0;
3932 if (VEC_length (tree, pending_statics) != 0
3933 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3934 VEC_length (tree, pending_statics)))
3941 /* All used inline functions must have a definition at this point. */
3942 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3944 if (/* Check online inline functions that were actually used. */
3945 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3946 /* If the definition actually was available here, then the
3947 fact that the function was not defined merely represents
3948 that for some reason (use of a template repository,
3949 #pragma interface, etc.) we decided not to emit the
3951 && !DECL_INITIAL (decl)
3952 /* Don't complain if the template was defined. */
3953 && !(DECL_TEMPLATE_INSTANTIATION (decl)
3954 && DECL_INITIAL (DECL_TEMPLATE_RESULT
3955 (template_for_substitution (decl)))))
3957 warning (0, "inline function %q+D used but never defined", decl);
3958 /* Avoid a duplicate warning from check_global_declaration_1. */
3959 TREE_NO_WARNING (decl) = 1;
3963 /* So must decls that use a type with no linkage. */
3964 FOR_EACH_VEC_ELT (tree, no_linkage_decls, i, decl)
3965 if (!decl_defined_p (decl))
3966 no_linkage_error (decl);
3968 /* Then, do the Objective-C stuff. This is where all the
3969 Objective-C module stuff gets generated (symtab,
3970 class/protocol/selector lists etc). This must be done after C++
3971 templates, destructors etc. so that selectors used in C++
3972 templates are properly allocated. */
3973 if (c_dialect_objc ())
3974 objc_write_global_declarations ();
3976 /* We give C linkage to static constructors and destructors. */
3977 push_lang_context (lang_name_c);
3979 /* Generate initialization and destruction functions for all
3980 priorities for which they are required. */
3981 if (priority_info_map)
3982 splay_tree_foreach (priority_info_map,
3983 generate_ctor_and_dtor_functions_for_priority,
3985 else if (c_dialect_objc () && objc_static_init_needed_p ())
3986 /* If this is obj-c++ and we need a static init, call
3987 generate_ctor_or_dtor_function. */
3988 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3989 DEFAULT_INIT_PRIORITY, &locus);
3991 /* We're done with the splay-tree now. */
3992 if (priority_info_map)
3993 splay_tree_delete (priority_info_map);
3995 /* Generate any missing aliases. */
3996 maybe_apply_pending_pragma_weaks ();
3998 /* We're done with static constructors, so we can go back to "C++"
4000 pop_lang_context ();
4002 /* Collect candidates for Java hidden aliases. */
4003 candidates = collect_candidates_for_java_method_aliases ();
4005 timevar_stop (TV_PHASE_DEFERRED);
4006 timevar_start (TV_PHASE_CGRAPH);
4008 cgraph_finalize_compilation_unit ();
4010 timevar_stop (TV_PHASE_CGRAPH);
4011 timevar_start (TV_PHASE_CHECK_DBGINFO);
4013 /* Now, issue warnings about static, but not defined, functions,
4014 etc., and emit debugging information. */
4015 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
4016 if (VEC_length (tree, pending_statics) != 0)
4018 check_global_declarations (VEC_address (tree, pending_statics),
4019 VEC_length (tree, pending_statics));
4020 emit_debug_global_declarations (VEC_address (tree, pending_statics),
4021 VEC_length (tree, pending_statics));
4024 perform_deferred_noexcept_checks ();
4026 /* Generate hidden aliases for Java. */
4029 build_java_method_aliases (candidates);
4030 pointer_set_destroy (candidates);
4035 /* The entire file is now complete. If requested, dump everything
4039 FILE *stream = dump_begin (TDI_tu, &flags);
4043 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
4044 dump_end (TDI_tu, stream);
4048 if (flag_detailed_statistics)
4050 dump_tree_statistics ();
4051 dump_time_statistics ();
4053 input_location = locus;
4055 #ifdef ENABLE_CHECKING
4056 validate_conversion_obstack ();
4057 #endif /* ENABLE_CHECKING */
4059 timevar_stop (TV_PHASE_CHECK_DBGINFO);
4062 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4063 function to call in parse-tree form; it has not yet been
4064 semantically analyzed. ARGS are the arguments to the function.
4065 They have already been semantically analyzed. This may change
4069 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
4072 VEC(tree,gc) *orig_args = NULL;
4077 object = TREE_OPERAND (fn, 0);
4079 if (processing_template_decl)
4081 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
4082 || TREE_CODE (fn) == MEMBER_REF);
4083 if (type_dependent_expression_p (fn)
4084 || any_type_dependent_arguments_p (*args))
4085 return build_nt_call_vec (fn, *args);
4087 orig_args = make_tree_vector_copy (*args);
4089 /* Transform the arguments and add the implicit "this"
4090 parameter. That must be done before the FN is transformed
4091 because we depend on the form of FN. */
4092 make_args_non_dependent (*args);
4093 object = build_non_dependent_expr (object);
4094 if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
4096 if (TREE_CODE (fn) == DOTSTAR_EXPR)
4097 object = cp_build_addr_expr (object, tf_warning_or_error);
4098 VEC_safe_insert (tree, gc, *args, 0, object);
4100 /* Now that the arguments are done, transform FN. */
4101 fn = build_non_dependent_expr (fn);
4104 /* A qualified name corresponding to a bound pointer-to-member is
4105 represented as an OFFSET_REF:
4107 struct B { void g(); };
4109 void B::g() { (this->*p)(); } */
4110 if (TREE_CODE (fn) == OFFSET_REF)
4112 tree object_addr = cp_build_addr_expr (object, tf_warning_or_error);
4113 fn = TREE_OPERAND (fn, 1);
4114 fn = get_member_function_from_ptrfunc (&object_addr, fn);
4115 VEC_safe_insert (tree, gc, *args, 0, object_addr);
4118 if (CLASS_TYPE_P (TREE_TYPE (fn)))
4119 expr = build_op_call (fn, args, tf_warning_or_error);
4121 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
4122 if (processing_template_decl && expr != error_mark_node)
4123 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
4125 if (orig_args != NULL)
4126 release_tree_vector (orig_args);
4133 check_default_args (tree x)
4135 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
4136 bool saw_def = false;
4137 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
4138 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
4140 if (TREE_PURPOSE (arg))
4144 error ("default argument missing for parameter %P of %q+#D", i, x);
4145 TREE_PURPOSE (arg) = error_mark_node;
4150 /* Return true if function DECL can be inlined. This is used to force
4151 instantiation of methods that might be interesting for inlining. */
4153 possibly_inlined_p (tree decl)
4155 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
4156 if (DECL_UNINLINABLE (decl))
4158 if (!optimize || pragma_java_exceptions)
4159 return DECL_DECLARED_INLINE_P (decl);
4160 /* When optimizing, we might inline everything when flatten
4161 attribute or heuristics inlining for size or autoinlining
4166 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4167 If DECL is a specialization or implicitly declared class member,
4168 generate the actual definition. */
4171 mark_used (tree decl)
4173 /* If DECL is a BASELINK for a single function, then treat it just
4174 like the DECL for the function. Otherwise, if the BASELINK is
4175 for an overloaded function, we don't know which function was
4176 actually used until after overload resolution. */
4177 if (TREE_CODE (decl) == BASELINK)
4179 decl = BASELINK_FUNCTIONS (decl);
4180 if (really_overloaded_fn (decl))
4182 decl = OVL_CURRENT (decl);
4185 /* Set TREE_USED for the benefit of -Wunused. */
4186 TREE_USED (decl) = 1;
4187 if (DECL_CLONED_FUNCTION_P (decl))
4188 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4190 if (TREE_CODE (decl) == FUNCTION_DECL
4191 && DECL_DELETED_FN (decl))
4193 if (DECL_ARTIFICIAL (decl))
4195 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
4196 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
4198 /* We mark a lambda conversion op as deleted if we can't
4199 generate it properly; see maybe_add_lambda_conv_op. */
4200 sorry ("converting lambda which uses %<...%> to "
4201 "function pointer");
4205 error ("use of deleted function %qD", decl);
4206 if (!maybe_explain_implicit_delete (decl))
4207 error_at (DECL_SOURCE_LOCATION (decl), "declared here");
4211 /* We can only check DECL_ODR_USED on variables or functions with
4212 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4213 might need special handling for. */
4214 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4215 || DECL_LANG_SPECIFIC (decl) == NULL
4216 || DECL_THUNK_P (decl))
4219 /* We only want to do this processing once. We don't need to keep trying
4220 to instantiate inline templates, because unit-at-a-time will make sure
4221 we get them compiled before functions that want to inline them. */
4222 if (DECL_ODR_USED (decl))
4225 /* If within finish_function, defer the rest until that function
4226 finishes, otherwise it might recurse. */
4227 if (defer_mark_used_calls)
4229 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4233 if (TREE_CODE (decl) == FUNCTION_DECL)
4234 maybe_instantiate_noexcept (decl);
4236 /* Normally, we can wait until instantiation-time to synthesize DECL.
4237 However, if DECL is a static data member initialized with a constant
4238 or a constexpr function, we need it right now because a reference to
4239 such a data member or a call to such function is not value-dependent. */
4240 if ((decl_maybe_constant_var_p (decl)
4241 || (TREE_CODE (decl) == FUNCTION_DECL
4242 && DECL_DECLARED_CONSTEXPR_P (decl)))
4243 && DECL_LANG_SPECIFIC (decl)
4244 && DECL_TEMPLATE_INFO (decl)
4245 && !uses_template_parms (DECL_TI_ARGS (decl)))
4247 /* Instantiating a function will result in garbage collection. We
4248 must treat this situation as if we were within the body of a
4249 function so as to avoid collecting live data only referenced from
4250 the stack (such as overload resolution candidates). */
4252 instantiate_decl (decl, /*defer_ok=*/false,
4253 /*expl_inst_class_mem_p=*/false);
4257 /* If we don't need a value, then we don't need to synthesize DECL. */
4258 if (cp_unevaluated_operand != 0)
4261 if (processing_template_decl)
4264 /* Check this too in case we're within fold_non_dependent_expr. */
4265 if (DECL_TEMPLATE_INFO (decl)
4266 && uses_template_parms (DECL_TI_ARGS (decl)))
4269 DECL_ODR_USED (decl) = 1;
4270 if (DECL_CLONED_FUNCTION_P (decl))
4271 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4273 /* DR 757: A type without linkage shall not be used as the type of a
4274 variable or function with linkage, unless
4275 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4276 o the variable or function is not used (3.2 [basic.def.odr]) or is
4277 defined in the same translation unit. */
4278 if (cxx_dialect > cxx98
4279 && decl_linkage (decl) != lk_none
4280 && !DECL_EXTERN_C_P (decl)
4281 && !DECL_ARTIFICIAL (decl)
4282 && !decl_defined_p (decl)
4283 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4285 if (is_local_extern (decl))
4286 /* There's no way to define a local extern, and adding it to
4287 the vector interferes with GC, so give an error now. */
4288 no_linkage_error (decl);
4290 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4293 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4294 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4295 /* Remember it, so we can check it was defined. */
4296 note_vague_linkage_fn (decl);
4298 /* Is it a synthesized method that needs to be synthesized? */
4299 if (TREE_CODE (decl) == FUNCTION_DECL
4300 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4301 && DECL_DEFAULTED_FN (decl)
4302 /* A function defaulted outside the class is synthesized either by
4303 cp_finish_decl or instantiate_decl. */
4304 && !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl)
4305 && ! DECL_INITIAL (decl))
4307 /* Remember the current location for a function we will end up
4308 synthesizing. Then we can inform the user where it was
4309 required in the case of error. */
4310 DECL_SOURCE_LOCATION (decl) = input_location;
4312 /* Synthesizing an implicitly defined member function will result in
4313 garbage collection. We must treat this situation as if we were
4314 within the body of a function so as to avoid collecting live data
4315 on the stack (such as overload resolution candidates).
4317 We could just let cp_write_global_declarations handle synthesizing
4318 this function, since we just added it to deferred_fns, but doing
4319 it at the use site produces better error messages. */
4321 synthesize_method (decl);
4323 /* If this is a synthesized method we don't need to
4324 do the instantiation test below. */
4326 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4327 && DECL_TEMPLATE_INFO (decl)
4328 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4329 || always_instantiate_p (decl)))
4330 /* If this is a function or variable that is an instance of some
4331 template, we now know that we will need to actually do the
4332 instantiation. We check that DECL is not an explicit
4333 instantiation because that is not checked in instantiate_decl.
4335 We put off instantiating functions in order to improve compile
4336 times. Maintaining a stack of active functions is expensive,
4337 and the inliner knows to instantiate any functions it might
4338 need. Therefore, we always try to defer instantiation. */
4341 instantiate_decl (decl, /*defer_ok=*/true,
4342 /*expl_inst_class_mem_p=*/false);
4347 #include "gt-cp-decl2.h"