1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
45 #include "c-family/c-common.h"
46 #include "tree-mudflap.h"
48 #include "tree-inline.h"
49 #include "c-family/c-pragma.h"
50 #include "tree-dump.h"
53 #include "pointer-set.h"
54 #include "splay-tree.h"
55 #include "langhooks.h"
56 #include "c-family/c-ada-spec.h"
58 extern cpp_reader *parse_in;
60 /* This structure contains information about the initializations
61 and/or destructions required for a particular priority level. */
62 typedef struct priority_info_s {
63 /* Nonzero if there have been any initializations at this priority
64 throughout the translation unit. */
65 int initializations_p;
66 /* Nonzero if there have been any destructions at this priority
67 throughout the translation unit. */
71 static void mark_vtable_entries (tree);
72 static bool maybe_emit_vtables (tree);
73 static bool acceptable_java_type (tree);
74 static tree start_objects (int, int);
75 static void finish_objects (int, int, tree);
76 static tree start_static_storage_duration_function (unsigned);
77 static void finish_static_storage_duration_function (tree);
78 static priority_info get_priority_info (int);
79 static void do_static_initialization_or_destruction (tree, bool);
80 static void one_static_initialization_or_destruction (tree, tree, bool);
81 static void generate_ctor_or_dtor_function (bool, int, location_t *);
82 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
84 static tree prune_vars_needing_no_initialization (tree *);
85 static void write_out_vars (tree);
86 static void import_export_class (tree);
87 static tree get_guard_bits (tree);
88 static void determine_visibility_from_class (tree, tree);
89 static bool decl_defined_p (tree);
91 /* A list of static class variables. This is needed, because a
92 static class variable can be declared inside the class without
93 an initializer, and then initialized, statically, outside the class. */
94 static GTY(()) VEC(tree,gc) *pending_statics;
96 /* A list of functions which were declared inline, but which we
97 may need to emit outline anyway. */
98 static GTY(()) VEC(tree,gc) *deferred_fns;
100 /* A list of decls that use types with no linkage, which we need to make
102 static GTY(()) VEC(tree,gc) *no_linkage_decls;
104 /* Nonzero if we're done parsing and into end-of-file activities. */
110 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
111 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
112 that apply to the function). */
115 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
121 if (fntype == error_mark_node || ctype == error_mark_node)
122 return error_mark_node;
124 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
125 || TREE_CODE (fntype) == METHOD_TYPE);
127 type_quals = quals & ~TYPE_QUAL_RESTRICT;
128 ctype = cp_build_qualified_type (ctype, type_quals);
129 raises = TYPE_RAISES_EXCEPTIONS (fntype);
130 attrs = TYPE_ATTRIBUTES (fntype);
131 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
132 (TREE_CODE (fntype) == METHOD_TYPE
133 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
134 : TYPE_ARG_TYPES (fntype)));
136 fntype = build_exception_variant (fntype, raises);
138 fntype = cp_build_type_attribute_variant (fntype, attrs);
143 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
144 return type changed to NEW_RET. */
147 change_return_type (tree new_ret, tree fntype)
150 tree args = TYPE_ARG_TYPES (fntype);
151 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
152 tree attrs = TYPE_ATTRIBUTES (fntype);
154 if (same_type_p (new_ret, TREE_TYPE (fntype)))
157 if (TREE_CODE (fntype) == FUNCTION_TYPE)
159 newtype = build_function_type (new_ret, args);
160 newtype = apply_memfn_quals (newtype, type_memfn_quals (fntype));
163 newtype = build_method_type_directly
164 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype))),
165 new_ret, TREE_CHAIN (args));
167 newtype = build_exception_variant (newtype, raises);
169 newtype = cp_build_type_attribute_variant (newtype, attrs);
174 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
178 cp_build_parm_decl (tree name, tree type)
180 tree parm = build_decl (input_location,
181 PARM_DECL, name, type);
182 /* DECL_ARG_TYPE is only used by the back end and the back end never
184 if (!processing_template_decl)
185 DECL_ARG_TYPE (parm) = type_passed_as (type);
187 /* If the type is a pack expansion, then we have a function
189 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
190 FUNCTION_PARAMETER_PACK_P (parm) = 1;
195 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
199 build_artificial_parm (tree name, tree type)
201 tree parm = cp_build_parm_decl (name, type);
202 DECL_ARTIFICIAL (parm) = 1;
203 /* All our artificial parms are implicitly `const'; they cannot be
205 TREE_READONLY (parm) = 1;
209 /* Constructors for types with virtual baseclasses need an "in-charge" flag
210 saying whether this constructor is responsible for initialization of
211 virtual baseclasses or not. All destructors also need this "in-charge"
212 flag, which additionally determines whether or not the destructor should
213 free the memory for the object.
215 This function adds the "in-charge" flag to member function FN if
216 appropriate. It is called from grokclassfn and tsubst.
217 FN must be either a constructor or destructor.
219 The in-charge flag follows the 'this' parameter, and is followed by the
220 VTT parm (if any), then the user-written parms. */
223 maybe_retrofit_in_chrg (tree fn)
225 tree basetype, arg_types, parms, parm, fntype;
227 /* If we've already add the in-charge parameter don't do it again. */
228 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
231 /* When processing templates we can't know, in general, whether or
232 not we're going to have virtual baseclasses. */
233 if (processing_template_decl)
236 /* We don't need an in-charge parameter for constructors that don't
237 have virtual bases. */
238 if (DECL_CONSTRUCTOR_P (fn)
239 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
242 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
243 basetype = TREE_TYPE (TREE_VALUE (arg_types));
244 arg_types = TREE_CHAIN (arg_types);
246 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
248 /* If this is a subobject constructor or destructor, our caller will
249 pass us a pointer to our VTT. */
250 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
252 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
254 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
255 TREE_CHAIN (parm) = parms;
258 /* ...and then to TYPE_ARG_TYPES. */
259 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
261 DECL_HAS_VTT_PARM_P (fn) = 1;
264 /* Then add the in-charge parm (before the VTT parm). */
265 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
266 TREE_CHAIN (parm) = parms;
268 arg_types = hash_tree_chain (integer_type_node, arg_types);
270 /* Insert our new parameter(s) into the list. */
271 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
273 /* And rebuild the function type. */
274 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
276 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
277 fntype = build_exception_variant (fntype,
278 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
279 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
280 fntype = (cp_build_type_attribute_variant
281 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
282 TREE_TYPE (fn) = fntype;
284 /* Now we've got the in-charge parameter. */
285 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
288 /* Classes overload their constituent function names automatically.
289 When a function name is declared in a record structure,
290 its name is changed to it overloaded name. Since names for
291 constructors and destructors can conflict, we place a leading
294 CNAME is the name of the class we are grokking for.
296 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
298 FLAGS contains bits saying what's special about today's
299 arguments. DTOR_FLAG == DESTRUCTOR.
301 If FUNCTION is a destructor, then we must add the `auto-delete' field
302 as a second parameter. There is some hair associated with the fact
303 that we must "declare" this variable in the manner consistent with the
304 way the rest of the arguments were declared.
306 QUALS are the qualifiers for the this pointer. */
309 grokclassfn (tree ctype, tree function, enum overload_flags flags)
311 tree fn_name = DECL_NAME (function);
313 /* Even within an `extern "C"' block, members get C++ linkage. See
314 [dcl.link] for details. */
315 SET_DECL_LANGUAGE (function, lang_cplusplus);
317 if (fn_name == NULL_TREE)
319 error ("name missing for member function");
320 fn_name = get_identifier ("<anonymous>");
321 DECL_NAME (function) = fn_name;
324 DECL_CONTEXT (function) = ctype;
326 if (flags == DTOR_FLAG)
327 DECL_DESTRUCTOR_P (function) = 1;
329 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
330 maybe_retrofit_in_chrg (function);
333 /* Create an ARRAY_REF, checking for the user doing things backwards
337 grok_array_decl (tree array_expr, tree index_exp)
341 tree orig_array_expr = array_expr;
342 tree orig_index_exp = index_exp;
344 if (error_operand_p (array_expr) || error_operand_p (index_exp))
345 return error_mark_node;
347 if (processing_template_decl)
349 if (type_dependent_expression_p (array_expr)
350 || type_dependent_expression_p (index_exp))
351 return build_min_nt (ARRAY_REF, array_expr, index_exp,
352 NULL_TREE, NULL_TREE);
353 array_expr = build_non_dependent_expr (array_expr);
354 index_exp = build_non_dependent_expr (index_exp);
357 type = TREE_TYPE (array_expr);
359 type = non_reference (type);
361 /* If they have an `operator[]', use that. */
362 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
363 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
364 array_expr, index_exp, NULL_TREE,
365 /*overloaded_p=*/NULL, tf_warning_or_error);
370 /* Otherwise, create an ARRAY_REF for a pointer or array type.
371 It is a little-known fact that, if `a' is an array and `i' is
372 an int, you can write `i[a]', which means the same thing as
374 if (TREE_CODE (type) == ARRAY_TYPE)
377 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
379 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
382 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
384 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
386 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
389 if ((p1 && i2) && (i1 && p2))
390 error ("ambiguous conversion for array subscript");
393 array_expr = p1, index_exp = i2;
395 array_expr = p2, index_exp = i1;
398 error ("invalid types %<%T[%T]%> for array subscript",
399 type, TREE_TYPE (index_exp));
400 return error_mark_node;
403 if (array_expr == error_mark_node || index_exp == error_mark_node)
404 error ("ambiguous conversion for array subscript");
406 expr = build_array_ref (input_location, array_expr, index_exp);
408 if (processing_template_decl && expr != error_mark_node)
409 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
410 NULL_TREE, NULL_TREE);
414 /* Given the cast expression EXP, checking out its validity. Either return
415 an error_mark_node if there was an unavoidable error, return a cast to
416 void for trying to delete a pointer w/ the value 0, or return the
417 call to delete. If DOING_VEC is true, we handle things differently
418 for doing an array delete.
419 Implements ARM $5.3.4. This is called from the parser. */
422 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
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,
480 return build_delete (type, t, sfk_deleting_destructor,
481 LOOKUP_NORMAL, use_global_delete);
484 /* Report an error if the indicated template declaration is not the
485 sort of thing that should be a member template. */
488 check_member_template (tree tmpl)
492 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
493 decl = DECL_TEMPLATE_RESULT (tmpl);
495 if (TREE_CODE (decl) == FUNCTION_DECL
496 || (TREE_CODE (decl) == TYPE_DECL
497 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
499 /* The parser rejects template declarations in local classes. */
500 gcc_assert (!current_function_decl);
501 /* The parser rejects any use of virtual in a function template. */
502 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
503 && DECL_VIRTUAL_P (decl)));
505 /* The debug-information generating code doesn't know what to do
506 with member templates. */
507 DECL_IGNORED_P (tmpl) = 1;
510 error ("template declaration of %q#D", decl);
513 /* Return true iff TYPE is a valid Java parameter or return type. */
516 acceptable_java_type (tree type)
518 if (type == error_mark_node)
521 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
523 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
525 type = TREE_TYPE (type);
526 if (TREE_CODE (type) == RECORD_TYPE)
529 if (! TYPE_FOR_JAVA (type))
531 if (! CLASSTYPE_TEMPLATE_INFO (type))
533 args = CLASSTYPE_TI_ARGS (type);
534 i = TREE_VEC_LENGTH (args);
537 type = TREE_VEC_ELT (args, i);
538 if (TREE_CODE (type) == POINTER_TYPE)
539 type = TREE_TYPE (type);
540 if (! TYPE_FOR_JAVA (type))
549 /* For a METHOD in a Java class CTYPE, return true if
550 the parameter and return types are valid Java types.
551 Otherwise, print appropriate error messages, and return false. */
554 check_java_method (tree method)
557 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
558 tree ret_type = TREE_TYPE (TREE_TYPE (method));
560 if (!acceptable_java_type (ret_type))
562 error ("Java method %qD has non-Java return type %qT",
567 arg_types = TREE_CHAIN (arg_types);
568 if (DECL_HAS_IN_CHARGE_PARM_P (method))
569 arg_types = TREE_CHAIN (arg_types);
570 if (DECL_HAS_VTT_PARM_P (method))
571 arg_types = TREE_CHAIN (arg_types);
573 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
575 tree type = TREE_VALUE (arg_types);
576 if (!acceptable_java_type (type))
578 if (type != error_mark_node)
579 error ("Java method %qD has non-Java parameter type %qT",
587 /* Sanity check: report error if this function FUNCTION is not
588 really a member of the class (CTYPE) it is supposed to belong to.
589 TEMPLATE_PARMS is used to specify the template parameters of a member
590 template passed as FUNCTION_DECL. If the member template is passed as a
591 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
592 from the declaration. If the function is not a function template, it
594 It returns the original declaration for the function, NULL_TREE if
595 no declaration was found, error_mark_node if an error was emitted. */
598 check_classfn (tree ctype, tree function, tree template_parms)
604 if (DECL_USE_TEMPLATE (function)
605 && !(TREE_CODE (function) == TEMPLATE_DECL
606 && DECL_TEMPLATE_SPECIALIZATION (function))
607 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
608 /* Since this is a specialization of a member template,
609 we're not going to find the declaration in the class.
612 struct S { template <typename T> void f(T); };
613 template <> void S::f(int);
615 we're not going to find `S::f(int)', but there's no
616 reason we should, either. We let our callers know we didn't
617 find the method, but we don't complain. */
620 /* Basic sanity check: for a template function, the template parameters
621 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
622 if (TREE_CODE (function) == TEMPLATE_DECL)
625 && !comp_template_parms (template_parms,
626 DECL_TEMPLATE_PARMS (function)))
628 error ("template parameter lists provided don't match the "
629 "template parameters of %qD", function);
630 return error_mark_node;
632 template_parms = DECL_TEMPLATE_PARMS (function);
635 /* OK, is this a definition of a member template? */
636 is_template = (template_parms != NULL_TREE);
638 /* We must enter the scope here, because conversion operators are
639 named by target type, and type equivalence relies on typenames
640 resolving within the scope of CTYPE. */
641 pushed_scope = push_scope (ctype);
642 ix = class_method_index_for_fn (complete_type (ctype), function);
645 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
646 tree fndecls, fndecl = 0;
648 const char *format = NULL;
650 for (fndecls = VEC_index (tree, methods, ix);
651 fndecls; fndecls = OVL_NEXT (fndecls))
655 fndecl = OVL_CURRENT (fndecls);
656 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
657 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
659 /* We cannot simply call decls_match because this doesn't
660 work for static member functions that are pretending to
661 be methods, and because the name may have been changed by
664 /* Get rid of the this parameter on functions that become
666 if (DECL_STATIC_FUNCTION_P (fndecl)
667 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
668 p1 = TREE_CHAIN (p1);
670 /* A member template definition only matches a member template
672 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
675 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
676 TREE_TYPE (TREE_TYPE (fndecl)))
677 && compparms (p1, p2)
679 || comp_template_parms (template_parms,
680 DECL_TEMPLATE_PARMS (fndecl)))
681 && (DECL_TEMPLATE_SPECIALIZATION (function)
682 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
683 && (!DECL_TEMPLATE_SPECIALIZATION (function)
684 || (DECL_TI_TEMPLATE (function)
685 == DECL_TI_TEMPLATE (fndecl))))
691 pop_scope (pushed_scope);
692 return OVL_CURRENT (fndecls);
695 error_at (DECL_SOURCE_LOCATION (function),
696 "prototype for %q#D does not match any in class %qT",
698 is_conv_op = DECL_CONV_FN_P (fndecl);
701 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
702 fndecls = VEC_index (tree, methods, ix);
705 fndecl = OVL_CURRENT (fndecls);
706 fndecls = OVL_NEXT (fndecls);
708 if (!fndecls && is_conv_op)
710 if (VEC_length (tree, methods) > (size_t) ++ix)
712 fndecls = VEC_index (tree, methods, ix);
713 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
725 format = N_("candidates are: %+#D");
727 format = N_("candidate is: %+#D");
728 error (format, fndecl);
731 else if (!COMPLETE_TYPE_P (ctype))
732 cxx_incomplete_type_error (function, ctype);
734 error ("no %q#D member function declared in class %qT",
738 pop_scope (pushed_scope);
739 return error_mark_node;
742 /* DECL is a function with vague linkage. Remember it so that at the
743 end of the translation unit we can decide whether or not to emit
747 note_vague_linkage_fn (tree decl)
749 DECL_DEFER_OUTPUT (decl) = 1;
750 VEC_safe_push (tree, gc, deferred_fns, decl);
753 /* We have just processed the DECL, which is a static data member.
754 The other parameters are as for cp_finish_decl. */
757 finish_static_data_member_decl (tree decl,
758 tree init, bool init_const_expr_p,
762 DECL_CONTEXT (decl) = current_class_type;
764 /* We cannot call pushdecl here, because that would fill in the
765 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
766 the right thing, namely, to put this decl out straight away. */
768 if (! processing_template_decl)
769 VEC_safe_push (tree, gc, pending_statics, decl);
771 if (LOCAL_CLASS_P (current_class_type))
772 permerror (input_location, "local class %q#T shall not have static data member %q#D",
773 current_class_type, decl);
775 /* Static consts need not be initialized in the class definition. */
776 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
778 static int explained = 0;
780 error ("initializer invalid for static member with constructor");
783 error ("(an out of class initialization is required)");
789 DECL_INITIAL (decl) = init;
790 DECL_IN_AGGR_P (decl) = 1;
792 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
793 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
794 SET_VAR_HAD_UNKNOWN_BOUND (decl);
796 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
799 /* DECLARATOR and DECLSPECS correspond to a class member. The other
800 parameters are as for cp_finish_decl. Return the DECL for the
801 class member declared. */
804 grokfield (const cp_declarator *declarator,
805 cp_decl_specifier_seq *declspecs,
806 tree init, bool init_const_expr_p,
811 const char *asmspec = 0;
812 int flags = LOOKUP_ONLYCONVERTING;
816 && TREE_CODE (init) == TREE_LIST
817 && TREE_VALUE (init) == error_mark_node
818 && TREE_CHAIN (init) == NULL_TREE)
821 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
822 if (! value || error_operand_p (value))
823 /* friend or constructor went bad. */
824 return error_mark_node;
826 if (TREE_CODE (value) == TYPE_DECL && init)
828 error ("typedef %qD is initialized (use decltype instead)", value);
832 /* Pass friendly classes back. */
833 if (value == void_type_node)
836 /* Pass friend decls back. */
837 if ((TREE_CODE (value) == FUNCTION_DECL
838 || TREE_CODE (value) == TEMPLATE_DECL)
839 && DECL_CONTEXT (value) != current_class_type)
842 name = DECL_NAME (value);
844 if (name != NULL_TREE)
846 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
848 error ("explicit template argument list not allowed");
849 return error_mark_node;
852 if (IDENTIFIER_POINTER (name)[0] == '_'
853 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
854 error ("member %qD conflicts with virtual function table field name",
858 /* Stash away type declarations. */
859 if (TREE_CODE (value) == TYPE_DECL)
861 DECL_NONLOCAL (value) = 1;
862 DECL_CONTEXT (value) = current_class_type;
864 if (processing_template_decl)
865 value = push_template_decl (value);
871 /* If this is a typedef that names the class for linkage purposes
872 (7.1.3p8), apply any attributes directly to the type. */
873 if (TAGGED_TYPE_P (TREE_TYPE (value))
874 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
875 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
877 cplus_decl_attributes (&value, attrlist, attrflags);
880 if (declspecs->specs[(int)ds_typedef]
881 && TREE_TYPE (value) != error_mark_node
882 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
883 cp_set_underlying_type (value);
888 if (DECL_IN_AGGR_P (value))
890 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
891 return void_type_node;
894 if (asmspec_tree && asmspec_tree != error_mark_node)
895 asmspec = TREE_STRING_POINTER (asmspec_tree);
899 if (TREE_CODE (value) == FUNCTION_DECL)
901 /* Initializers for functions are rejected early in the parser.
902 If we get here, it must be a pure specifier for a method. */
903 if (init == ridpointers[(int)RID_DELETE])
905 DECL_DELETED_FN (value) = 1;
906 DECL_DECLARED_INLINE_P (value) = 1;
907 DECL_INITIAL (value) = error_mark_node;
909 else if (init == ridpointers[(int)RID_DEFAULT])
911 if (defaultable_fn_check (value))
913 DECL_DEFAULTED_FN (value) = 1;
914 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
915 DECL_DECLARED_INLINE_P (value) = 1;
918 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
920 if (integer_zerop (init))
921 DECL_PURE_VIRTUAL_P (value) = 1;
922 else if (error_operand_p (init))
923 ; /* An error has already been reported. */
925 error ("invalid initializer for member function %qD",
930 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
931 error ("initializer specified for static member function %qD",
935 else if (pedantic && TREE_CODE (value) != VAR_DECL)
936 /* Already complained in grokdeclarator. */
938 else if (!processing_template_decl)
940 if (TREE_CODE (init) == CONSTRUCTOR)
941 init = digest_init (TREE_TYPE (value), init);
943 init = integral_constant_value (init);
945 if (init != error_mark_node && !TREE_CONSTANT (init))
947 /* We can allow references to things that are effectively
948 static, since references are initialized with the
950 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
951 || (TREE_STATIC (init) == 0
952 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
954 error ("field initializer is not constant");
955 init = error_mark_node;
961 if (processing_template_decl
962 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
964 value = push_template_decl (value);
965 if (error_operand_p (value))
966 return error_mark_node;
970 cplus_decl_attributes (&value, attrlist, 0);
972 switch (TREE_CODE (value))
975 finish_static_data_member_decl (value, init, init_const_expr_p,
976 asmspec_tree, flags);
981 error ("%<asm%> specifiers are not permitted on non-static data members");
982 if (DECL_INITIAL (value) == error_mark_node)
983 init = error_mark_node;
984 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
986 DECL_INITIAL (value) = init;
987 DECL_IN_AGGR_P (value) = 1;
992 set_user_assembler_name (value, asmspec);
994 cp_finish_decl (value,
996 /*init_const_expr_p=*/false,
997 asmspec_tree, flags);
999 /* Pass friends back this way. */
1000 if (DECL_FRIEND_P (value))
1001 return void_type_node;
1003 DECL_IN_AGGR_P (value) = 1;
1012 /* Like `grokfield', but for bitfields.
1013 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1016 grokbitfield (const cp_declarator *declarator,
1017 cp_decl_specifier_seq *declspecs, tree width,
1020 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1022 if (value == error_mark_node)
1023 return NULL_TREE; /* friends went bad. */
1025 /* Pass friendly classes back. */
1026 if (TREE_CODE (value) == VOID_TYPE)
1027 return void_type_node;
1029 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
1030 && (POINTER_TYPE_P (value)
1031 || !dependent_type_p (TREE_TYPE (value))))
1033 error ("bit-field %qD with non-integral type", value);
1034 return error_mark_node;
1037 if (TREE_CODE (value) == TYPE_DECL)
1039 error ("cannot declare %qD to be a bit-field type", value);
1043 /* Usually, finish_struct_1 catches bitfields with invalid types.
1044 But, in the case of bitfields with function type, we confuse
1045 ourselves into thinking they are member functions, so we must
1047 if (TREE_CODE (value) == FUNCTION_DECL)
1049 error ("cannot declare bit-field %qD with function type",
1054 if (DECL_IN_AGGR_P (value))
1056 error ("%qD is already defined in the class %qT", value,
1057 DECL_CONTEXT (value));
1058 return void_type_node;
1061 if (TREE_STATIC (value))
1063 error ("static member %qD cannot be a bit-field", value);
1066 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1068 if (width != error_mark_node)
1070 constant_expression_warning (width);
1071 DECL_INITIAL (value) = width;
1072 SET_DECL_C_BIT_FIELD (value);
1075 DECL_IN_AGGR_P (value) = 1;
1078 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1084 /* Returns true iff ATTR is an attribute which needs to be applied at
1085 instantiation time rather than template definition time. */
1088 is_late_template_attribute (tree attr, tree decl)
1090 tree name = TREE_PURPOSE (attr);
1091 tree args = TREE_VALUE (attr);
1092 const struct attribute_spec *spec = lookup_attribute_spec (name);
1096 /* Unknown attribute. */
1099 /* Attribute weak handling wants to write out assembly right away. */
1100 if (is_attribute_p ("weak", name))
1103 /* If any of the arguments are dependent expressions, we can't evaluate
1104 the attribute until instantiation time. */
1105 for (arg = args; arg; arg = TREE_CHAIN (arg))
1107 tree t = TREE_VALUE (arg);
1109 /* If the first attribute argument is an identifier, only consider
1110 second and following arguments. Attributes like mode, format,
1111 cleanup and several target specific attributes aren't late
1112 just because they have an IDENTIFIER_NODE as first argument. */
1113 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1116 if (value_dependent_expression_p (t)
1117 || type_dependent_expression_p (t))
1121 if (TREE_CODE (decl) == TYPE_DECL
1123 || spec->type_required)
1125 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1127 /* We can't apply any attributes to a completely unknown type until
1128 instantiation time. */
1129 enum tree_code code = TREE_CODE (type);
1130 if (code == TEMPLATE_TYPE_PARM
1131 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1132 || code == TYPENAME_TYPE)
1134 /* Also defer most attributes on dependent types. This is not
1135 necessary in all cases, but is the better default. */
1136 else if (dependent_type_p (type)
1137 /* But attribute visibility specifically works on
1139 && !is_attribute_p ("visibility", name))
1148 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1149 applied at instantiation time and return them. If IS_DEPENDENT is true,
1150 the declaration itself is dependent, so all attributes should be applied
1151 at instantiation time. */
1154 splice_template_attributes (tree *attr_p, tree decl)
1157 tree late_attrs = NULL_TREE;
1158 tree *q = &late_attrs;
1165 if (is_late_template_attribute (*p, decl))
1167 ATTR_IS_DEPENDENT (*p) = 1;
1169 *p = TREE_CHAIN (*p);
1170 q = &TREE_CHAIN (*q);
1174 p = &TREE_CHAIN (*p);
1180 /* Remove any late attributes from the list in ATTR_P and attach them to
1184 save_template_attributes (tree *attr_p, tree *decl_p)
1186 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1188 tree old_attrs = NULL_TREE;
1193 if (DECL_P (*decl_p))
1194 q = &DECL_ATTRIBUTES (*decl_p);
1196 q = &TYPE_ATTRIBUTES (*decl_p);
1200 /* Place the late attributes at the beginning of the attribute
1202 TREE_CHAIN (tree_last (late_attrs)) = *q;
1205 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1207 /* We've added new attributes directly to the main variant, so
1208 now we need to update all of the other variants to include
1209 these new attributes. */
1211 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1212 variant = TYPE_NEXT_VARIANT (variant))
1214 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1215 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1220 /* Like reconstruct_complex_type, but handle also template trees. */
1223 cp_reconstruct_complex_type (tree type, tree bottom)
1227 if (TREE_CODE (type) == POINTER_TYPE)
1229 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1230 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1231 TYPE_REF_CAN_ALIAS_ALL (type));
1233 else if (TREE_CODE (type) == REFERENCE_TYPE)
1235 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1236 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1237 TYPE_REF_CAN_ALIAS_ALL (type));
1239 else if (TREE_CODE (type) == ARRAY_TYPE)
1241 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1242 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1243 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1244 element type qualification will be handled by the recursive
1245 cp_reconstruct_complex_type call and cp_build_qualified_type
1246 for ARRAY_TYPEs changes the element type. */
1249 else if (TREE_CODE (type) == FUNCTION_TYPE)
1251 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1252 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1253 outer = apply_memfn_quals (outer, type_memfn_quals (type));
1255 else if (TREE_CODE (type) == METHOD_TYPE)
1257 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1258 /* The build_method_type_directly() routine prepends 'this' to argument list,
1259 so we must compensate by getting rid of it. */
1261 = build_method_type_directly
1262 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1264 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1266 else if (TREE_CODE (type) == OFFSET_TYPE)
1268 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1269 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1274 if (TYPE_ATTRIBUTES (type))
1275 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1276 return cp_build_qualified_type (outer, cp_type_quals (type));
1279 /* Like decl_attributes, but handle C++ complexity. */
1282 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1284 if (*decl == NULL_TREE || *decl == void_type_node
1285 || *decl == error_mark_node
1286 || attributes == NULL_TREE)
1289 if (processing_template_decl)
1291 if (check_for_bare_parameter_packs (attributes))
1294 save_template_attributes (&attributes, decl);
1295 if (attributes == NULL_TREE)
1299 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1300 decl = &DECL_TEMPLATE_RESULT (*decl);
1302 decl_attributes (decl, attributes, flags);
1304 if (TREE_CODE (*decl) == TYPE_DECL)
1305 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1308 /* Walks through the namespace- or function-scope anonymous union
1309 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1310 Returns one of the fields for use in the mangled name. */
1313 build_anon_union_vars (tree type, tree object)
1315 tree main_decl = NULL_TREE;
1318 /* Rather than write the code to handle the non-union case,
1319 just give an error. */
1320 if (TREE_CODE (type) != UNION_TYPE)
1321 error ("anonymous struct not inside named type");
1323 for (field = TYPE_FIELDS (type);
1325 field = TREE_CHAIN (field))
1330 if (DECL_ARTIFICIAL (field))
1332 if (TREE_CODE (field) != FIELD_DECL)
1334 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1335 "have non-static data members", field);
1339 if (TREE_PRIVATE (field))
1340 permerror (input_location, "private member %q+#D in anonymous union", field);
1341 else if (TREE_PROTECTED (field))
1342 permerror (input_location, "protected member %q+#D in anonymous union", field);
1344 if (processing_template_decl)
1345 ref = build_min_nt (COMPONENT_REF, object,
1346 DECL_NAME (field), NULL_TREE);
1348 ref = build_class_member_access_expr (object, field, NULL_TREE,
1349 false, tf_warning_or_error);
1351 if (DECL_NAME (field))
1355 decl = build_decl (input_location,
1356 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1357 DECL_ANON_UNION_VAR_P (decl) = 1;
1358 DECL_ARTIFICIAL (decl) = 1;
1360 base = get_base_address (object);
1361 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1362 TREE_STATIC (decl) = TREE_STATIC (base);
1363 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1365 SET_DECL_VALUE_EXPR (decl, ref);
1366 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1368 decl = pushdecl (decl);
1370 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1371 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1375 if (main_decl == NULL_TREE)
1382 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1383 anonymous union, then all members must be laid out together. PUBLIC_P
1384 is nonzero if this union is not declared static. */
1387 finish_anon_union (tree anon_union_decl)
1393 if (anon_union_decl == error_mark_node)
1396 type = TREE_TYPE (anon_union_decl);
1397 public_p = TREE_PUBLIC (anon_union_decl);
1399 /* The VAR_DECL's context is the same as the TYPE's context. */
1400 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1402 if (TYPE_FIELDS (type) == NULL_TREE)
1407 error ("namespace-scope anonymous aggregates must be static");
1411 main_decl = build_anon_union_vars (type, anon_union_decl);
1412 if (main_decl == error_mark_node)
1414 if (main_decl == NULL_TREE)
1416 warning (0, "anonymous union with no members");
1420 if (!processing_template_decl)
1422 /* Use main_decl to set the mangled name. */
1423 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1424 maybe_commonize_var (anon_union_decl);
1425 mangle_decl (anon_union_decl);
1426 DECL_NAME (anon_union_decl) = NULL_TREE;
1429 pushdecl (anon_union_decl);
1430 if (building_stmt_tree ()
1431 && at_function_scope_p ())
1432 add_decl_expr (anon_union_decl);
1433 else if (!processing_template_decl)
1434 rest_of_decl_compilation (anon_union_decl,
1435 toplevel_bindings_p (), at_eof);
1438 /* Auxiliary functions to make type signatures for
1439 `operator new' and `operator delete' correspond to
1440 what compiler will be expecting. */
1443 coerce_new_type (tree type)
1446 tree args = TYPE_ARG_TYPES (type);
1448 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1450 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1453 error ("%<operator new%> must return type %qT", ptr_type_node);
1456 if (args && args != void_list_node)
1458 if (TREE_PURPOSE (args))
1460 /* [basic.stc.dynamic.allocation]
1462 The first parameter shall not have an associated default
1464 error ("the first parameter of %<operator new%> cannot "
1465 "have a default argument");
1466 /* Throw away the default argument. */
1467 TREE_PURPOSE (args) = NULL_TREE;
1470 if (!same_type_p (TREE_VALUE (args), size_type_node))
1473 args = TREE_CHAIN (args);
1480 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1481 "as first parameter", size_type_node);
1486 args = tree_cons (NULL_TREE, size_type_node, args);
1489 type = build_exception_variant
1490 (build_function_type (ptr_type_node, args),
1491 TYPE_RAISES_EXCEPTIONS (type));
1499 coerce_delete_type (tree type)
1502 tree args = TYPE_ARG_TYPES (type);
1504 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1506 if (!same_type_p (TREE_TYPE (type), void_type_node))
1509 error ("%<operator delete%> must return type %qT", void_type_node);
1512 if (!args || args == void_list_node
1513 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1516 if (args && args != void_list_node)
1517 args = TREE_CHAIN (args);
1518 error ("%<operator delete%> takes type %qT as first parameter",
1524 args = tree_cons (NULL_TREE, ptr_type_node, args);
1527 type = build_exception_variant
1528 (build_function_type (void_type_node, args),
1529 TYPE_RAISES_EXCEPTIONS (type));
1537 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1538 and mark them as needed. */
1541 mark_vtable_entries (tree decl)
1544 unsigned HOST_WIDE_INT idx;
1546 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1551 STRIP_NOPS (fnaddr);
1553 if (TREE_CODE (fnaddr) != ADDR_EXPR
1554 && TREE_CODE (fnaddr) != FDESC_EXPR)
1555 /* This entry is an offset: a virtual base class offset, a
1556 virtual call offset, an RTTI offset, etc. */
1559 fn = TREE_OPERAND (fnaddr, 0);
1560 TREE_ADDRESSABLE (fn) = 1;
1561 /* When we don't have vcall offsets, we output thunks whenever
1562 we output the vtables that contain them. With vcall offsets,
1563 we know all the thunks we'll need when we emit a virtual
1564 function, so we emit the thunks there instead. */
1565 if (DECL_THUNK_P (fn))
1566 use_thunk (fn, /*emit_p=*/0);
1571 /* Set DECL up to have the closest approximation of "initialized common"
1572 linkage available. */
1575 comdat_linkage (tree decl)
1578 make_decl_one_only (decl, cxx_comdat_group (decl));
1579 else if (TREE_CODE (decl) == FUNCTION_DECL
1580 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1581 /* We can just emit function and compiler-generated variables
1582 statically; having multiple copies is (for the most part) only
1585 There are two correctness issues, however: the address of a
1586 template instantiation with external linkage should be the
1587 same, independent of what translation unit asks for the
1588 address, and this will not hold when we emit multiple copies of
1589 the function. However, there's little else we can do.
1591 Also, by default, the typeinfo implementation assumes that
1592 there will be only one copy of the string used as the name for
1593 each type. Therefore, if weak symbols are unavailable, the
1594 run-time library should perform a more conservative check; it
1595 should perform a string comparison, rather than an address
1597 TREE_PUBLIC (decl) = 0;
1600 /* Static data member template instantiations, however, cannot
1601 have multiple copies. */
1602 if (DECL_INITIAL (decl) == 0
1603 || DECL_INITIAL (decl) == error_mark_node)
1604 DECL_COMMON (decl) = 1;
1605 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1607 DECL_COMMON (decl) = 1;
1608 DECL_INITIAL (decl) = error_mark_node;
1610 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1612 /* We can't do anything useful; leave vars for explicit
1614 DECL_EXTERNAL (decl) = 1;
1615 DECL_NOT_REALLY_EXTERN (decl) = 0;
1619 DECL_COMDAT (decl) = 1;
1622 /* For win32 we also want to put explicit instantiations in
1623 linkonce sections, so that they will be merged with implicit
1624 instantiations; otherwise we get duplicate symbol errors.
1625 For Darwin we do not want explicit instantiations to be
1629 maybe_make_one_only (tree decl)
1631 /* We used to say that this was not necessary on targets that support weak
1632 symbols, because the implicit instantiations will defer to the explicit
1633 one. However, that's not actually the case in SVR4; a strong definition
1634 after a weak one is an error. Also, not making explicit
1635 instantiations one_only means that we can end up with two copies of
1636 some template instantiations. */
1640 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1641 we can get away with not emitting them if they aren't used. We need
1642 to for variables so that cp_finish_decl will update their linkage,
1643 because their DECL_INITIAL may not have been set properly yet. */
1645 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1646 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1647 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1649 make_decl_one_only (decl, cxx_comdat_group (decl));
1651 if (TREE_CODE (decl) == VAR_DECL)
1653 DECL_COMDAT (decl) = 1;
1654 /* Mark it needed so we don't forget to emit it. */
1655 mark_decl_referenced (decl);
1660 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1661 This predicate will give the right answer during parsing of the
1662 function, which other tests may not. */
1665 vague_linkage_p (tree decl)
1667 /* Unfortunately, import_export_decl has not always been called
1668 before the function is processed, so we cannot simply check
1670 return (DECL_COMDAT (decl)
1671 || (((TREE_CODE (decl) == FUNCTION_DECL
1672 && DECL_DECLARED_INLINE_P (decl))
1673 || (DECL_LANG_SPECIFIC (decl)
1674 && DECL_TEMPLATE_INSTANTIATION (decl)))
1675 && TREE_PUBLIC (decl)));
1678 /* Determine whether or not we want to specifically import or export CTYPE,
1679 using various heuristics. */
1682 import_export_class (tree ctype)
1684 /* -1 for imported, 1 for exported. */
1685 int import_export = 0;
1687 /* It only makes sense to call this function at EOF. The reason is
1688 that this function looks at whether or not the first non-inline
1689 non-abstract virtual member function has been defined in this
1690 translation unit. But, we can't possibly know that until we've
1691 seen the entire translation unit. */
1692 gcc_assert (at_eof);
1694 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1697 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1698 we will have CLASSTYPE_INTERFACE_ONLY set but not
1699 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1700 heuristic because someone will supply a #pragma implementation
1701 elsewhere, and deducing it here would produce a conflict. */
1702 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1705 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1707 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1709 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1710 && !flag_implicit_templates)
1711 /* For a template class, without -fimplicit-templates, check the
1712 repository. If the virtual table is assigned to this
1713 translation unit, then export the class; otherwise, import
1715 import_export = repo_export_class_p (ctype) ? 1 : -1;
1716 else if (TYPE_POLYMORPHIC_P (ctype))
1718 /* The ABI specifies that the virtual table and associated
1719 information are emitted with the key method, if any. */
1720 tree method = CLASSTYPE_KEY_METHOD (ctype);
1721 /* If weak symbol support is not available, then we must be
1722 careful not to emit the vtable when the key function is
1723 inline. An inline function can be defined in multiple
1724 translation units. If we were to emit the vtable in each
1725 translation unit containing a definition, we would get
1726 multiple definition errors at link-time. */
1727 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1728 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1731 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1732 a definition anywhere else. */
1733 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1736 /* Allow back ends the chance to overrule the decision. */
1737 if (targetm.cxx.import_export_class)
1738 import_export = targetm.cxx.import_export_class (ctype, import_export);
1742 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1743 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1747 /* Return true if VAR has already been provided to the back end; in that
1748 case VAR should not be modified further by the front end. */
1750 var_finalized_p (tree var)
1752 return varpool_node (var)->finalized;
1755 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1756 must be emitted in this translation unit. Mark it as such. */
1759 mark_needed (tree decl)
1761 /* It's possible that we no longer need to set
1762 TREE_SYMBOL_REFERENCED here directly, but doing so is
1764 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1765 mark_decl_referenced (decl);
1768 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1769 returns true if a definition of this entity should be provided in
1770 this object file. Callers use this function to determine whether
1771 or not to let the back end know that a definition of DECL is
1772 available in this translation unit. */
1775 decl_needed_p (tree decl)
1777 gcc_assert (TREE_CODE (decl) == VAR_DECL
1778 || TREE_CODE (decl) == FUNCTION_DECL);
1779 /* This function should only be called at the end of the translation
1780 unit. We cannot be sure of whether or not something will be
1781 COMDAT until that point. */
1782 gcc_assert (at_eof);
1784 /* All entities with external linkage that are not COMDAT should be
1785 emitted; they may be referred to from other object files. */
1786 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1788 /* If this entity was used, let the back end see it; it will decide
1789 whether or not to emit it into the object file. */
1790 if (TREE_USED (decl)
1791 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1792 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1794 /* Functions marked "dllexport" must be emitted so that they are
1795 visible to other DLLs. */
1796 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1798 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1799 reference to DECL might cause it to be emitted later. */
1803 /* If necessary, write out the vtables for the dynamic class CTYPE.
1804 Returns true if any vtables were emitted. */
1807 maybe_emit_vtables (tree ctype)
1812 struct varpool_node *current = NULL, *last = NULL, *first = NULL;
1814 /* If the vtables for this class have already been emitted there is
1815 nothing more to do. */
1816 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1817 if (var_finalized_p (primary_vtbl))
1819 /* Ignore dummy vtables made by get_vtable_decl. */
1820 if (TREE_TYPE (primary_vtbl) == void_type_node)
1823 /* On some targets, we cannot determine the key method until the end
1824 of the translation unit -- which is when this function is
1826 if (!targetm.cxx.key_method_may_be_inline ())
1827 determine_key_method (ctype);
1829 /* See if any of the vtables are needed. */
1830 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1832 import_export_decl (vtbl);
1833 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1838 /* If the references to this class' vtables are optimized away,
1839 still emit the appropriate debugging information. See
1841 if (DECL_COMDAT (primary_vtbl)
1842 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1843 note_debug_info_needed (ctype);
1847 /* The ABI requires that we emit all of the vtables if we emit any
1849 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1851 /* Mark entities references from the virtual table as used. */
1852 mark_vtable_entries (vtbl);
1854 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1856 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1858 /* It had better be all done at compile-time. */
1863 DECL_EXTERNAL (vtbl) = 0;
1864 rest_of_decl_compilation (vtbl, 1, 1);
1866 /* Because we're only doing syntax-checking, we'll never end up
1867 actually marking the variable as written. */
1868 if (flag_syntax_only)
1869 TREE_ASM_WRITTEN (vtbl) = 1;
1870 else if (DECL_COMDAT (vtbl))
1872 current = varpool_node (vtbl);
1874 last->same_comdat_group = current;
1882 last->same_comdat_group = first;
1884 /* Since we're writing out the vtable here, also write the debug
1886 note_debug_info_needed (ctype);
1891 /* A special return value from type_visibility meaning internal
1894 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1896 /* walk_tree helper function for type_visibility. */
1899 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1901 int *vis_p = (int *)data;
1906 else if (CLASS_TYPE_P (*tp))
1908 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1910 *vis_p = VISIBILITY_ANON;
1913 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1914 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1919 /* Returns the visibility of TYPE, which is the minimum visibility of its
1923 type_visibility (tree type)
1925 int vis = VISIBILITY_DEFAULT;
1926 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1930 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1931 specified (or if VISIBILITY is static). */
1934 constrain_visibility (tree decl, int visibility)
1936 if (visibility == VISIBILITY_ANON)
1938 /* extern "C" declarations aren't affected by the anonymous
1940 if (!DECL_EXTERN_C_P (decl))
1942 TREE_PUBLIC (decl) = 0;
1943 DECL_WEAK (decl) = 0;
1944 DECL_COMMON (decl) = 0;
1945 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1946 DECL_INTERFACE_KNOWN (decl) = 1;
1947 if (DECL_LANG_SPECIFIC (decl))
1948 DECL_NOT_REALLY_EXTERN (decl) = 1;
1951 else if (visibility > DECL_VISIBILITY (decl)
1952 && !DECL_VISIBILITY_SPECIFIED (decl))
1954 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1960 /* Constrain the visibility of DECL based on the visibility of its template
1964 constrain_visibility_for_template (tree decl, tree targs)
1966 /* If this is a template instantiation, check the innermost
1967 template args for visibility constraints. The outer template
1968 args are covered by the class check. */
1969 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1971 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1975 tree arg = TREE_VEC_ELT (args, i-1);
1977 vis = type_visibility (arg);
1978 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1981 if (TREE_CODE (arg) == ADDR_EXPR)
1982 arg = TREE_OPERAND (arg, 0);
1983 if (TREE_CODE (arg) == VAR_DECL
1984 || TREE_CODE (arg) == FUNCTION_DECL)
1986 if (! TREE_PUBLIC (arg))
1987 vis = VISIBILITY_ANON;
1989 vis = DECL_VISIBILITY (arg);
1993 constrain_visibility (decl, vis);
1997 /* Like c_determine_visibility, but with additional C++-specific
2000 Function-scope entities can rely on the function's visibility because
2001 it is set in start_preparsed_function.
2003 Class-scope entities cannot rely on the class's visibility until the end
2004 of the enclosing class definition.
2006 Note that because namespaces have multiple independent definitions,
2007 namespace visibility is handled elsewhere using the #pragma visibility
2008 machinery rather than by decorating the namespace declaration.
2010 The goal is for constraints from the type to give a diagnostic, and
2011 other constraints to be applied silently. */
2014 determine_visibility (tree decl)
2016 tree class_type = NULL_TREE;
2018 bool orig_visibility_specified;
2019 enum symbol_visibility orig_visibility;
2021 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2023 /* Only relevant for names with external linkage. */
2024 if (!TREE_PUBLIC (decl))
2027 /* Cloned constructors and destructors get the same visibility as
2028 the underlying function. That should be set up in
2029 maybe_clone_body. */
2030 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2032 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2033 orig_visibility = DECL_VISIBILITY (decl);
2035 if (TREE_CODE (decl) == TYPE_DECL)
2037 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2038 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2039 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2044 else if (DECL_LANG_SPECIFIC (decl))
2045 use_template = DECL_USE_TEMPLATE (decl);
2049 /* If DECL is a member of a class, visibility specifiers on the
2050 class can influence the visibility of the DECL. */
2051 if (DECL_CLASS_SCOPE_P (decl))
2052 class_type = DECL_CONTEXT (decl);
2055 /* Not a class member. */
2057 /* Virtual tables have DECL_CONTEXT set to their associated class,
2058 so they are automatically handled above. */
2059 gcc_assert (TREE_CODE (decl) != VAR_DECL
2060 || !DECL_VTABLE_OR_VTT_P (decl));
2062 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2064 /* Local statics and classes get the visibility of their
2065 containing function by default, except that
2066 -fvisibility-inlines-hidden doesn't affect them. */
2067 tree fn = DECL_CONTEXT (decl);
2068 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2070 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2071 DECL_VISIBILITY_SPECIFIED (decl) =
2072 DECL_VISIBILITY_SPECIFIED (fn);
2075 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2077 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2078 but have no TEMPLATE_INFO, so don't try to check it. */
2081 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2082 && flag_visibility_ms_compat)
2084 /* Under -fvisibility-ms-compat, types are visible by default,
2085 even though their contents aren't. */
2086 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2087 int underlying_vis = type_visibility (underlying_type);
2088 if (underlying_vis == VISIBILITY_ANON
2089 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
2090 constrain_visibility (decl, underlying_vis);
2092 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2094 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2096 /* tinfo visibility is based on the type it's for. */
2097 constrain_visibility
2098 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2100 /* Give the target a chance to override the visibility associated
2102 if (TREE_PUBLIC (decl)
2103 && !DECL_REALLY_EXTERN (decl)
2104 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2105 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2106 targetm.cxx.determine_class_data_visibility (decl);
2108 else if (use_template)
2109 /* Template instantiations and specializations get visibility based
2110 on their template unless they override it with an attribute. */;
2111 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2113 /* Set default visibility to whatever the user supplied with
2114 #pragma GCC visibility or a namespace visibility attribute. */
2115 DECL_VISIBILITY (decl) = default_visibility;
2116 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2122 /* If the specialization doesn't specify visibility, use the
2123 visibility from the template. */
2124 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2125 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2126 : DECL_TEMPLATE_INFO (decl));
2127 tree args = TI_ARGS (tinfo);
2129 if (args != error_mark_node)
2131 int depth = TMPL_ARGS_DEPTH (args);
2132 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2134 if (!DECL_VISIBILITY_SPECIFIED (decl))
2136 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2137 DECL_VISIBILITY_SPECIFIED (decl)
2138 = DECL_VISIBILITY_SPECIFIED (pattern);
2141 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2142 if (args && depth > template_class_depth (class_type))
2143 /* Limit visibility based on its template arguments. */
2144 constrain_visibility_for_template (decl, args);
2149 determine_visibility_from_class (decl, class_type);
2151 if (decl_anon_ns_mem_p (decl))
2152 /* Names in an anonymous namespace get internal linkage.
2153 This might change once we implement export. */
2154 constrain_visibility (decl, VISIBILITY_ANON);
2155 else if (TREE_CODE (decl) != TYPE_DECL)
2157 /* Propagate anonymity from type to decl. */
2158 int tvis = type_visibility (TREE_TYPE (decl));
2159 if (tvis == VISIBILITY_ANON
2160 || ! DECL_VISIBILITY_SPECIFIED (decl))
2161 constrain_visibility (decl, tvis);
2163 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2164 /* DR 757: A type without linkage shall not be used as the type of a
2165 variable or function with linkage, unless
2166 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2167 o the variable or function is not used (3.2 [basic.def.odr]) or is
2168 defined in the same translation unit.
2170 Since non-extern "C" decls need to be defined in the same
2171 translation unit, we can make the type internal. */
2172 constrain_visibility (decl, VISIBILITY_ANON);
2174 /* If visibility changed and DECL already has DECL_RTL, ensure
2175 symbol flags are updated. */
2176 if ((DECL_VISIBILITY (decl) != orig_visibility
2177 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2178 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2179 || TREE_CODE (decl) == FUNCTION_DECL)
2180 && DECL_RTL_SET_P (decl))
2181 make_decl_rtl (decl);
2184 /* By default, static data members and function members receive
2185 the visibility of their containing class. */
2188 determine_visibility_from_class (tree decl, tree class_type)
2190 if (DECL_VISIBILITY_SPECIFIED (decl))
2193 if (visibility_options.inlines_hidden
2194 /* Don't do this for inline templates; specializations might not be
2195 inline, and we don't want them to inherit the hidden
2196 visibility. We'll set it here for all inline instantiations. */
2197 && !processing_template_decl
2198 && TREE_CODE (decl) == FUNCTION_DECL
2199 && DECL_DECLARED_INLINE_P (decl)
2200 && (! DECL_LANG_SPECIFIC (decl)
2201 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2202 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2205 /* Default to the class visibility. */
2206 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2207 DECL_VISIBILITY_SPECIFIED (decl)
2208 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2211 /* Give the target a chance to override the visibility associated
2213 if (TREE_CODE (decl) == VAR_DECL
2214 && (DECL_TINFO_P (decl)
2215 || (DECL_VTABLE_OR_VTT_P (decl)
2216 /* Construction virtual tables are not exported because
2217 they cannot be referred to from other object files;
2218 their name is not standardized by the ABI. */
2219 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2220 && TREE_PUBLIC (decl)
2221 && !DECL_REALLY_EXTERN (decl)
2222 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2223 targetm.cxx.determine_class_data_visibility (decl);
2226 /* Constrain the visibility of a class TYPE based on the visibility of its
2227 field types. Warn if any fields require lesser visibility. */
2230 constrain_class_visibility (tree type)
2236 int vis = type_visibility (type);
2238 if (vis == VISIBILITY_ANON
2239 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2242 /* Don't warn about visibility if the class has explicit visibility. */
2243 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2244 vis = VISIBILITY_INTERNAL;
2246 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
2247 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2249 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2250 int subvis = type_visibility (ftype);
2252 if (subvis == VISIBILITY_ANON)
2254 if (!in_main_input_context ())
2256 %qT has a field %qD whose type uses the anonymous namespace",
2259 else if (MAYBE_CLASS_TYPE_P (ftype)
2260 && vis < VISIBILITY_HIDDEN
2261 && subvis >= VISIBILITY_HIDDEN)
2262 warning (OPT_Wattributes, "\
2263 %qT declared with greater visibility than the type of its field %qD",
2267 binfo = TYPE_BINFO (type);
2268 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2270 int subvis = type_visibility (TREE_TYPE (t));
2272 if (subvis == VISIBILITY_ANON)
2274 if (!in_main_input_context())
2276 %qT has a base %qT whose type uses the anonymous namespace",
2277 type, TREE_TYPE (t));
2279 else if (vis < VISIBILITY_HIDDEN
2280 && subvis >= VISIBILITY_HIDDEN)
2281 warning (OPT_Wattributes, "\
2282 %qT declared with greater visibility than its base %qT",
2283 type, TREE_TYPE (t));
2287 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2288 for DECL has not already been determined, do so now by setting
2289 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2290 function is called entities with vague linkage whose definitions
2291 are available must have TREE_PUBLIC set.
2293 If this function decides to place DECL in COMDAT, it will set
2294 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2295 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2296 callers defer that decision until it is clear that DECL is actually
2300 import_export_decl (tree decl)
2305 tree class_type = NULL_TREE;
2307 if (DECL_INTERFACE_KNOWN (decl))
2310 /* We cannot determine what linkage to give to an entity with vague
2311 linkage until the end of the file. For example, a virtual table
2312 for a class will be defined if and only if the key method is
2313 defined in this translation unit. As a further example, consider
2314 that when compiling a translation unit that uses PCH file with
2315 "-frepo" it would be incorrect to make decisions about what
2316 entities to emit when building the PCH; those decisions must be
2317 delayed until the repository information has been processed. */
2318 gcc_assert (at_eof);
2319 /* Object file linkage for explicit instantiations is handled in
2320 mark_decl_instantiated. For static variables in functions with
2321 vague linkage, maybe_commonize_var is used.
2323 Therefore, the only declarations that should be provided to this
2324 function are those with external linkage that are:
2326 * implicit instantiations of function templates
2330 * implicit instantiations of static data members of class
2337 Furthermore, all entities that reach this point must have a
2338 definition available in this translation unit.
2340 The following assertions check these conditions. */
2341 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2342 || TREE_CODE (decl) == VAR_DECL);
2343 /* Any code that creates entities with TREE_PUBLIC cleared should
2344 also set DECL_INTERFACE_KNOWN. */
2345 gcc_assert (TREE_PUBLIC (decl));
2346 if (TREE_CODE (decl) == FUNCTION_DECL)
2347 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2348 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2349 || DECL_DECLARED_INLINE_P (decl));
2351 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2352 || DECL_VTABLE_OR_VTT_P (decl)
2353 || DECL_TINFO_P (decl));
2354 /* Check that a definition of DECL is available in this translation
2356 gcc_assert (!DECL_REALLY_EXTERN (decl));
2358 /* Assume that DECL will not have COMDAT linkage. */
2360 /* Assume that DECL will not be imported into this translation
2364 /* See if the repository tells us whether or not to emit DECL in
2365 this translation unit. */
2366 emit_p = repo_emit_p (decl);
2369 else if (emit_p == 1)
2371 /* The repository indicates that this entity should be defined
2372 here. Make sure the back end honors that request. */
2373 if (TREE_CODE (decl) == VAR_DECL)
2375 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2376 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2379 FOR_EACH_CLONE (clone, decl)
2380 mark_needed (clone);
2384 /* Output the definition as an ordinary strong definition. */
2385 DECL_EXTERNAL (decl) = 0;
2386 DECL_INTERFACE_KNOWN (decl) = 1;
2391 /* We have already decided what to do with this DECL; there is no
2392 need to check anything further. */
2394 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2396 class_type = DECL_CONTEXT (decl);
2397 import_export_class (class_type);
2398 if (TYPE_FOR_JAVA (class_type))
2400 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2401 && CLASSTYPE_INTERFACE_ONLY (class_type))
2403 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2404 && !CLASSTYPE_USE_TEMPLATE (class_type)
2405 && CLASSTYPE_KEY_METHOD (class_type)
2406 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2407 /* The ABI requires that all virtual tables be emitted with
2408 COMDAT linkage. However, on systems where COMDAT symbols
2409 don't show up in the table of contents for a static
2410 archive, or on systems without weak symbols (where we
2411 approximate COMDAT linkage by using internal linkage), the
2412 linker will report errors about undefined symbols because
2413 it will not see the virtual table definition. Therefore,
2414 in the case that we know that the virtual table will be
2415 emitted in only one translation unit, we make the virtual
2416 table an ordinary definition with external linkage. */
2417 DECL_EXTERNAL (decl) = 0;
2418 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2420 /* CLASS_TYPE is being exported from this translation unit,
2421 so DECL should be defined here. */
2422 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2423 /* If a class is declared in a header with the "extern
2424 template" extension, then it will not be instantiated,
2425 even in translation units that would normally require
2426 it. Often such classes are explicitly instantiated in
2427 one translation unit. Therefore, the explicit
2428 instantiation must be made visible to other translation
2430 DECL_EXTERNAL (decl) = 0;
2433 /* The generic C++ ABI says that class data is always
2434 COMDAT, even if there is a key function. Some
2435 variants (e.g., the ARM EABI) says that class data
2436 only has COMDAT linkage if the class data might be
2437 emitted in more than one translation unit. When the
2438 key method can be inline and is inline, we still have
2439 to arrange for comdat even though
2440 class_data_always_comdat is false. */
2441 if (!CLASSTYPE_KEY_METHOD (class_type)
2442 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2443 || targetm.cxx.class_data_always_comdat ())
2445 /* The ABI requires COMDAT linkage. Normally, we
2446 only emit COMDAT things when they are needed;
2447 make sure that we realize that this entity is
2454 else if (!flag_implicit_templates
2455 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2460 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2462 tree type = TREE_TYPE (DECL_NAME (decl));
2463 if (CLASS_TYPE_P (type))
2466 import_export_class (type);
2467 if (CLASSTYPE_INTERFACE_KNOWN (type)
2468 && TYPE_POLYMORPHIC_P (type)
2469 && CLASSTYPE_INTERFACE_ONLY (type)
2470 /* If -fno-rtti was specified, then we cannot be sure
2471 that RTTI information will be emitted with the
2472 virtual table of the class, so we must emit it
2473 wherever it is used. */
2478 if (CLASSTYPE_INTERFACE_KNOWN (type)
2479 && !CLASSTYPE_INTERFACE_ONLY (type))
2481 comdat_p = (targetm.cxx.class_data_always_comdat ()
2482 || (CLASSTYPE_KEY_METHOD (type)
2483 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2488 DECL_EXTERNAL (decl) = 0;
2498 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2499 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2501 /* DECL is an implicit instantiation of a function or static
2503 if ((flag_implicit_templates
2504 && !flag_use_repository)
2505 || (flag_implicit_inline_templates
2506 && TREE_CODE (decl) == FUNCTION_DECL
2507 && DECL_DECLARED_INLINE_P (decl)))
2510 /* If we are not implicitly generating templates, then mark
2511 this entity as undefined in this translation unit. */
2514 else if (DECL_FUNCTION_MEMBER_P (decl))
2516 if (!DECL_DECLARED_INLINE_P (decl))
2518 tree ctype = DECL_CONTEXT (decl);
2519 import_export_class (ctype);
2520 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2522 DECL_NOT_REALLY_EXTERN (decl)
2523 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2524 || (DECL_DECLARED_INLINE_P (decl)
2525 && ! flag_implement_inlines
2526 && !DECL_VINDEX (decl)));
2528 if (!DECL_NOT_REALLY_EXTERN (decl))
2529 DECL_EXTERNAL (decl) = 1;
2531 /* Always make artificials weak. */
2532 if (DECL_ARTIFICIAL (decl) && flag_weak)
2535 maybe_make_one_only (decl);
2546 /* If we are importing DECL into this translation unit, mark is
2547 an undefined here. */
2548 DECL_EXTERNAL (decl) = 1;
2549 DECL_NOT_REALLY_EXTERN (decl) = 0;
2553 /* If we decided to put DECL in COMDAT, mark it accordingly at
2555 comdat_linkage (decl);
2558 DECL_INTERFACE_KNOWN (decl) = 1;
2561 /* Return an expression that performs the destruction of DECL, which
2562 must be a VAR_DECL whose type has a non-trivial destructor, or is
2563 an array whose (innermost) elements have a non-trivial destructor. */
2566 build_cleanup (tree decl)
2569 tree type = TREE_TYPE (decl);
2571 /* This function should only be called for declarations that really
2572 require cleanups. */
2573 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2575 /* Treat all objects with destructors as used; the destructor may do
2576 something substantive. */
2579 if (TREE_CODE (type) == ARRAY_TYPE)
2582 temp = build_address (decl);
2583 temp = build_delete (TREE_TYPE (temp), temp,
2584 sfk_complete_destructor,
2585 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2589 /* Returns the initialization guard variable for the variable DECL,
2590 which has static storage duration. */
2593 get_guard (tree decl)
2598 sname = mangle_guard_variable (decl);
2599 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2604 /* We use a type that is big enough to contain a mutex as well
2605 as an integer counter. */
2606 guard_type = targetm.cxx.guard_type ();
2607 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2608 VAR_DECL, sname, guard_type);
2610 /* The guard should have the same linkage as what it guards. */
2611 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2612 TREE_STATIC (guard) = TREE_STATIC (decl);
2613 DECL_COMMON (guard) = DECL_COMMON (decl);
2614 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2615 if (DECL_ONE_ONLY (decl))
2616 make_decl_one_only (guard, cxx_comdat_group (guard));
2617 if (TREE_PUBLIC (decl))
2618 DECL_WEAK (guard) = DECL_WEAK (decl);
2619 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2620 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2622 DECL_ARTIFICIAL (guard) = 1;
2623 DECL_IGNORED_P (guard) = 1;
2624 TREE_USED (guard) = 1;
2625 pushdecl_top_level_and_finish (guard, NULL_TREE);
2630 /* Return those bits of the GUARD variable that should be set when the
2631 guarded entity is actually initialized. */
2634 get_guard_bits (tree guard)
2636 if (!targetm.cxx.guard_mask_bit ())
2638 /* We only set the first byte of the guard, in order to leave room
2639 for a mutex in the high-order bits. */
2640 guard = build1 (ADDR_EXPR,
2641 build_pointer_type (TREE_TYPE (guard)),
2643 guard = build1 (NOP_EXPR,
2644 build_pointer_type (char_type_node),
2646 guard = build1 (INDIRECT_REF, char_type_node, guard);
2652 /* Return an expression which determines whether or not the GUARD
2653 variable has already been initialized. */
2656 get_guard_cond (tree guard)
2660 /* Check to see if the GUARD is zero. */
2661 guard = get_guard_bits (guard);
2663 /* Mask off all but the low bit. */
2664 if (targetm.cxx.guard_mask_bit ())
2666 guard_value = integer_one_node;
2667 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2668 guard_value = convert (TREE_TYPE (guard), guard_value);
2669 guard = cp_build_binary_op (input_location,
2670 BIT_AND_EXPR, guard, guard_value,
2671 tf_warning_or_error);
2674 guard_value = integer_zero_node;
2675 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2676 guard_value = convert (TREE_TYPE (guard), guard_value);
2677 return cp_build_binary_op (input_location,
2678 EQ_EXPR, guard, guard_value,
2679 tf_warning_or_error);
2682 /* Return an expression which sets the GUARD variable, indicating that
2683 the variable being guarded has been initialized. */
2686 set_guard (tree guard)
2690 /* Set the GUARD to one. */
2691 guard = get_guard_bits (guard);
2692 guard_init = integer_one_node;
2693 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2694 guard_init = convert (TREE_TYPE (guard), guard_init);
2695 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2696 tf_warning_or_error);
2699 /* Start the process of running a particular set of global constructors
2700 or destructors. Subroutine of do_[cd]tors. */
2703 start_objects (int method_type, int initp)
2709 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2711 if (initp != DEFAULT_INIT_PRIORITY)
2721 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2724 sprintf (type, "%c", method_type);
2726 fndecl = build_lang_decl (FUNCTION_DECL,
2727 get_file_function_name (type),
2728 build_function_type_list (void_type_node,
2730 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2732 TREE_PUBLIC (current_function_decl) = 0;
2734 /* Mark as artificial because it's not explicitly in the user's
2736 DECL_ARTIFICIAL (current_function_decl) = 1;
2738 /* Mark this declaration as used to avoid spurious warnings. */
2739 TREE_USED (current_function_decl) = 1;
2741 /* Mark this function as a global constructor or destructor. */
2742 if (method_type == 'I')
2743 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2745 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2747 body = begin_compound_stmt (BCS_FN_BODY);
2752 /* Finish the process of running a particular set of global constructors
2753 or destructors. Subroutine of do_[cd]tors. */
2756 finish_objects (int method_type, int initp, tree body)
2761 finish_compound_stmt (body);
2762 fn = finish_function (0);
2764 if (method_type == 'I')
2766 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2767 decl_init_priority_insert (fn, initp);
2771 DECL_STATIC_DESTRUCTOR (fn) = 1;
2772 decl_fini_priority_insert (fn, initp);
2775 expand_or_defer_fn (fn);
2778 /* The names of the parameters to the function created to handle
2779 initializations and destructions for objects with static storage
2781 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2782 #define PRIORITY_IDENTIFIER "__priority"
2784 /* The name of the function we create to handle initializations and
2785 destructions for objects with static storage duration. */
2786 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2788 /* The declaration for the __INITIALIZE_P argument. */
2789 static GTY(()) tree initialize_p_decl;
2791 /* The declaration for the __PRIORITY argument. */
2792 static GTY(()) tree priority_decl;
2794 /* The declaration for the static storage duration function. */
2795 static GTY(()) tree ssdf_decl;
2797 /* All the static storage duration functions created in this
2798 translation unit. */
2799 static GTY(()) VEC(tree,gc) *ssdf_decls;
2801 /* A map from priority levels to information about that priority
2802 level. There may be many such levels, so efficient lookup is
2804 static splay_tree priority_info_map;
2806 /* Begins the generation of the function that will handle all
2807 initialization and destruction of objects with static storage
2808 duration. The function generated takes two parameters of type
2809 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2810 nonzero, it performs initializations. Otherwise, it performs
2811 destructions. It only performs those initializations or
2812 destructions with the indicated __PRIORITY. The generated function
2815 It is assumed that this function will only be called once per
2816 translation unit. */
2819 start_static_storage_duration_function (unsigned count)
2823 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2825 /* Create the identifier for this function. It will be of the form
2826 SSDF_IDENTIFIER_<number>. */
2827 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2829 type = build_function_type_list (void_type_node,
2830 integer_type_node, integer_type_node,
2833 /* Create the FUNCTION_DECL itself. */
2834 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2835 get_identifier (id),
2837 TREE_PUBLIC (ssdf_decl) = 0;
2838 DECL_ARTIFICIAL (ssdf_decl) = 1;
2840 /* Put this function in the list of functions to be called from the
2841 static constructors and destructors. */
2844 ssdf_decls = VEC_alloc (tree, gc, 32);
2846 /* Take this opportunity to initialize the map from priority
2847 numbers to information about that priority level. */
2848 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2849 /*delete_key_fn=*/0,
2850 /*delete_value_fn=*/
2851 (splay_tree_delete_value_fn) &free);
2853 /* We always need to generate functions for the
2854 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2855 priorities later, we'll be sure to find the
2856 DEFAULT_INIT_PRIORITY. */
2857 get_priority_info (DEFAULT_INIT_PRIORITY);
2860 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2862 /* Create the argument list. */
2863 initialize_p_decl = cp_build_parm_decl
2864 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2865 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2866 TREE_USED (initialize_p_decl) = 1;
2867 priority_decl = cp_build_parm_decl
2868 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2869 DECL_CONTEXT (priority_decl) = ssdf_decl;
2870 TREE_USED (priority_decl) = 1;
2872 TREE_CHAIN (initialize_p_decl) = priority_decl;
2873 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2875 /* Put the function in the global scope. */
2876 pushdecl (ssdf_decl);
2878 /* Start the function itself. This is equivalent to declaring the
2881 static void __ssdf (int __initialize_p, init __priority_p);
2883 It is static because we only need to call this function from the
2884 various constructor and destructor functions for this module. */
2885 start_preparsed_function (ssdf_decl,
2886 /*attrs=*/NULL_TREE,
2889 /* Set up the scope of the outermost block in the function. */
2890 body = begin_compound_stmt (BCS_FN_BODY);
2895 /* Finish the generation of the function which performs initialization
2896 and destruction of objects with static storage duration. After
2897 this point, no more such objects can be created. */
2900 finish_static_storage_duration_function (tree body)
2902 /* Close out the function. */
2903 finish_compound_stmt (body);
2904 expand_or_defer_fn (finish_function (0));
2907 /* Return the information about the indicated PRIORITY level. If no
2908 code to handle this level has yet been generated, generate the
2909 appropriate prologue. */
2911 static priority_info
2912 get_priority_info (int priority)
2917 n = splay_tree_lookup (priority_info_map,
2918 (splay_tree_key) priority);
2921 /* Create a new priority information structure, and insert it
2923 pi = XNEW (struct priority_info_s);
2924 pi->initializations_p = 0;
2925 pi->destructions_p = 0;
2926 splay_tree_insert (priority_info_map,
2927 (splay_tree_key) priority,
2928 (splay_tree_value) pi);
2931 pi = (priority_info) n->value;
2936 /* The effective initialization priority of a DECL. */
2938 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2939 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2940 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2942 /* Whether a DECL needs a guard to protect it against multiple
2945 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2946 || DECL_ONE_ONLY (decl) \
2947 || DECL_WEAK (decl)))
2949 /* Called from one_static_initialization_or_destruction(),
2951 Walks the initializer list of a global variable and looks for
2952 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2953 and that have their DECL_CONTEXT() == NULL.
2954 For each such temporary variable, set their DECL_CONTEXT() to
2955 the current function. This is necessary because otherwise
2956 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2957 when trying to refer to a temporary variable that does not have
2958 it's DECL_CONTECT() properly set. */
2960 fix_temporary_vars_context_r (tree *node,
2961 int *unused ATTRIBUTE_UNUSED,
2962 void *unused1 ATTRIBUTE_UNUSED)
2964 gcc_assert (current_function_decl);
2966 if (TREE_CODE (*node) == BIND_EXPR)
2970 for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var))
2971 if (TREE_CODE (var) == VAR_DECL
2973 && DECL_ARTIFICIAL (var)
2974 && !DECL_CONTEXT (var))
2975 DECL_CONTEXT (var) = current_function_decl;
2981 /* Set up to handle the initialization or destruction of DECL. If
2982 INITP is nonzero, we are initializing the variable. Otherwise, we
2983 are destroying it. */
2986 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2988 tree guard_if_stmt = NULL_TREE;
2991 /* If we are supposed to destruct and there's a trivial destructor,
2992 nothing has to be done. */
2994 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2997 /* Trick the compiler into thinking we are at the file and line
2998 where DECL was declared so that error-messages make sense, and so
2999 that the debugger will show somewhat sensible file and line
3001 input_location = DECL_SOURCE_LOCATION (decl);
3003 /* Make sure temporary variables in the initialiser all have
3004 their DECL_CONTEXT() set to a value different from NULL_TREE.
3005 This can happen when global variables initialisers are built.
3006 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3007 the temporary variables that might have been generated in the
3008 accompagning initialisers is NULL_TREE, meaning the variables have been
3009 declared in the global namespace.
3010 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3011 of the temporaries are set to the current function decl. */
3012 cp_walk_tree_without_duplicates (&init,
3013 fix_temporary_vars_context_r,
3020 Access control for implicit calls to the constructors,
3021 the conversion functions, or the destructor called to
3022 create and destroy a static data member is performed as
3023 if these calls appeared in the scope of the member's
3026 we pretend we are in a static member function of the class of
3027 which the DECL is a member. */
3028 if (member_p (decl))
3030 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3031 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3034 /* Assume we don't need a guard. */
3036 /* We need a guard if this is an object with external linkage that
3037 might be initialized in more than one place. (For example, a
3038 static data member of a template, when the data member requires
3040 if (NEEDS_GUARD_P (decl))
3044 guard = get_guard (decl);
3046 /* When using __cxa_atexit, we just check the GUARD as we would
3047 for a local static. */
3048 if (flag_use_cxa_atexit)
3050 /* When using __cxa_atexit, we never try to destroy
3051 anything from a static destructor. */
3053 guard_cond = get_guard_cond (guard);
3055 /* If we don't have __cxa_atexit, then we will be running
3056 destructors from .fini sections, or their equivalents. So,
3057 we need to know how many times we've tried to initialize this
3058 object. We do initializations only if the GUARD is zero,
3059 i.e., if we are the first to initialize the variable. We do
3060 destructions only if the GUARD is one, i.e., if we are the
3061 last to destroy the variable. */
3064 = cp_build_binary_op (input_location,
3066 cp_build_unary_op (PREINCREMENT_EXPR,
3069 tf_warning_or_error),
3071 tf_warning_or_error);
3074 = cp_build_binary_op (input_location,
3076 cp_build_unary_op (PREDECREMENT_EXPR,
3079 tf_warning_or_error),
3081 tf_warning_or_error);
3083 guard_if_stmt = begin_if_stmt ();
3084 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3088 /* If we're using __cxa_atexit, we have not already set the GUARD,
3089 so we must do so now. */
3090 if (guard && initp && flag_use_cxa_atexit)
3091 finish_expr_stmt (set_guard (guard));
3093 /* Perform the initialization or destruction. */
3097 finish_expr_stmt (init);
3099 /* If we're using __cxa_atexit, register a function that calls the
3100 destructor for the object. */
3101 if (flag_use_cxa_atexit)
3102 finish_expr_stmt (register_dtor_fn (decl));
3105 finish_expr_stmt (build_cleanup (decl));
3107 /* Finish the guard if-stmt, if necessary. */
3110 finish_then_clause (guard_if_stmt);
3111 finish_if_stmt (guard_if_stmt);
3114 /* Now that we're done with DECL we don't need to pretend to be a
3115 member of its class any longer. */
3116 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3117 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3120 /* Generate code to do the initialization or destruction of the decls in VARS,
3121 a TREE_LIST of VAR_DECL with static storage duration.
3122 Whether initialization or destruction is performed is specified by INITP. */
3125 do_static_initialization_or_destruction (tree vars, bool initp)
3127 tree node, init_if_stmt, cond;
3129 /* Build the outer if-stmt to check for initialization or destruction. */
3130 init_if_stmt = begin_if_stmt ();
3131 cond = initp ? integer_one_node : integer_zero_node;
3132 cond = cp_build_binary_op (input_location,
3136 tf_warning_or_error);
3137 finish_if_stmt_cond (cond, init_if_stmt);
3141 tree decl = TREE_VALUE (node);
3142 tree priority_if_stmt;
3146 /* If we don't need a destructor, there's nothing to do. Avoid
3147 creating a possibly empty if-stmt. */
3148 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3150 node = TREE_CHAIN (node);
3154 /* Remember that we had an initialization or finalization at this
3156 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3157 pi = get_priority_info (priority);
3159 pi->initializations_p = 1;
3161 pi->destructions_p = 1;
3163 /* Conditionalize this initialization on being in the right priority
3164 and being initializing/finalizing appropriately. */
3165 priority_if_stmt = begin_if_stmt ();
3166 cond = cp_build_binary_op (input_location,
3169 build_int_cst (NULL_TREE, priority),
3170 tf_warning_or_error);
3171 finish_if_stmt_cond (cond, priority_if_stmt);
3173 /* Process initializers with same priority. */
3175 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3176 node = TREE_CHAIN (node))
3177 /* Do one initialization or destruction. */
3178 one_static_initialization_or_destruction (TREE_VALUE (node),
3179 TREE_PURPOSE (node), initp);
3181 /* Finish up the priority if-stmt body. */
3182 finish_then_clause (priority_if_stmt);
3183 finish_if_stmt (priority_if_stmt);
3187 /* Finish up the init/destruct if-stmt body. */
3188 finish_then_clause (init_if_stmt);
3189 finish_if_stmt (init_if_stmt);
3192 /* VARS is a list of variables with static storage duration which may
3193 need initialization and/or finalization. Remove those variables
3194 that don't really need to be initialized or finalized, and return
3195 the resulting list. The order in which the variables appear in
3196 VARS is in reverse order of the order in which they should actually
3197 be initialized. The list we return is in the unreversed order;
3198 i.e., the first variable should be initialized first. */
3201 prune_vars_needing_no_initialization (tree *vars)
3204 tree result = NULL_TREE;
3209 tree decl = TREE_VALUE (t);
3210 tree init = TREE_PURPOSE (t);
3212 /* Deal gracefully with error. */
3213 if (decl == error_mark_node)
3215 var = &TREE_CHAIN (t);
3219 /* The only things that can be initialized are variables. */
3220 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3222 /* If this object is not defined, we don't need to do anything
3224 if (DECL_EXTERNAL (decl))
3226 var = &TREE_CHAIN (t);
3230 /* Also, if the initializer already contains errors, we can bail
3232 if (init && TREE_CODE (init) == TREE_LIST
3233 && value_member (error_mark_node, init))
3235 var = &TREE_CHAIN (t);
3239 /* This variable is going to need initialization and/or
3240 finalization, so we add it to the list. */
3241 *var = TREE_CHAIN (t);
3242 TREE_CHAIN (t) = result;
3249 /* Make sure we have told the back end about all the variables in
3253 write_out_vars (tree vars)
3257 for (v = vars; v; v = TREE_CHAIN (v))
3259 tree var = TREE_VALUE (v);
3260 if (!var_finalized_p (var))
3262 import_export_decl (var);
3263 rest_of_decl_compilation (var, 1, 1);
3268 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3269 (otherwise) that will initialize all global objects with static
3270 storage duration having the indicated PRIORITY. */
3273 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3281 input_location = *locus;
3283 /* Was: locus->line++; */
3285 /* We use `I' to indicate initialization and `D' to indicate
3287 function_key = constructor_p ? 'I' : 'D';
3289 /* We emit the function lazily, to avoid generating empty
3290 global constructors and destructors. */
3293 /* For Objective-C++, we may need to initialize metadata found in this module.
3294 This must be done _before_ any other static initializations. */
3295 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3296 && constructor_p && objc_static_init_needed_p ())
3298 body = start_objects (function_key, priority);
3299 objc_generate_static_init_call (NULL_TREE);
3302 /* Call the static storage duration function with appropriate
3304 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
3306 /* Calls to pure or const functions will expand to nothing. */
3307 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3312 body = start_objects (function_key, priority);
3314 call = cp_build_function_call_nary (fndecl, tf_warning_or_error,
3315 build_int_cst (NULL_TREE,
3317 build_int_cst (NULL_TREE,
3320 finish_expr_stmt (call);
3324 /* Close out the function. */
3326 finish_objects (function_key, priority, body);
3329 /* Generate constructor and destructor functions for the priority
3333 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3335 location_t *locus = (location_t *) data;
3336 int priority = (int) n->key;
3337 priority_info pi = (priority_info) n->value;
3339 /* Generate the functions themselves, but only if they are really
3341 if (pi->initializations_p)
3342 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3343 if (pi->destructions_p)
3344 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3346 /* Keep iterating. */
3350 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3351 decls referenced from front-end specific constructs; it will be called
3352 only for language-specific tree nodes.
3354 Here we must deal with member pointers. */
3357 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3361 switch (TREE_CODE (t))
3364 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3365 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3368 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3369 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3372 if (DECL_CONTEXT (t)
3373 && flag_use_repository
3374 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3375 /* If we need a static variable in a function, then we
3376 need the containing function. */
3377 mark_decl_referenced (DECL_CONTEXT (t));
3386 /* Java requires that we be able to reference a local address for a
3387 method, and not be confused by PLT entries. If hidden aliases are
3388 supported, collect and return all the functions for which we should
3389 emit a hidden alias. */
3391 static struct pointer_set_t *
3392 collect_candidates_for_java_method_aliases (void)
3394 struct cgraph_node *node;
3395 struct pointer_set_t *candidates = NULL;
3397 #ifndef HAVE_GAS_HIDDEN
3401 for (node = cgraph_nodes; node ; node = node->next)
3403 tree fndecl = node->decl;
3405 if (DECL_CONTEXT (fndecl)
3406 && TYPE_P (DECL_CONTEXT (fndecl))
3407 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3408 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3410 if (candidates == NULL)
3411 candidates = pointer_set_create ();
3412 pointer_set_insert (candidates, fndecl);
3420 /* Java requires that we be able to reference a local address for a
3421 method, and not be confused by PLT entries. If hidden aliases are
3422 supported, emit one for each java function that we've emitted.
3423 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3424 by collect_candidates_for_java_method_aliases. */
3427 build_java_method_aliases (struct pointer_set_t *candidates)
3429 struct cgraph_node *node;
3431 #ifndef HAVE_GAS_HIDDEN
3435 for (node = cgraph_nodes; node ; node = node->next)
3437 tree fndecl = node->decl;
3439 if (TREE_ASM_WRITTEN (fndecl)
3440 && pointer_set_contains (candidates, fndecl))
3442 /* Mangle the name in a predictable way; we need to reference
3443 this from a java compiled object file. */
3444 tree oid, nid, alias;
3448 oid = DECL_ASSEMBLER_NAME (fndecl);
3449 oname = IDENTIFIER_POINTER (oid);
3450 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3451 nname = ACONCAT (("_ZGA", oname+2, NULL));
3452 nid = get_identifier (nname);
3454 alias = make_alias_for (fndecl, nid);
3455 TREE_PUBLIC (alias) = 1;
3456 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3458 assemble_alias (alias, oid);
3463 /* Return C++ property of T, based on given operation OP. */
3466 cpp_check (tree t, cpp_operation op)
3471 return DECL_PURE_VIRTUAL_P (t);
3472 case IS_CONSTRUCTOR:
3473 return DECL_CONSTRUCTOR_P (t);
3475 return DECL_DESTRUCTOR_P (t);
3476 case IS_COPY_CONSTRUCTOR:
3477 return DECL_COPY_CONSTRUCTOR_P (t);
3479 return TREE_CODE (t) == TEMPLATE_DECL;
3485 /* Collect source file references recursively, starting from NAMESPC. */
3488 collect_source_refs (tree namespc)
3495 /* Iterate over names in this name space. */
3496 for (t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
3497 if (!DECL_IS_BUILTIN (t) )
3498 collect_source_ref (DECL_SOURCE_FILE (t));
3500 /* Dump siblings, if any */
3501 collect_source_refs (TREE_CHAIN (namespc));
3503 /* Dump children, if any */
3504 collect_source_refs (NAMESPACE_LEVEL (namespc)->namespaces);
3507 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
3508 starting from NAMESPC. */
3511 collect_ada_namespace (tree namespc, const char *source_file)
3516 /* Collect decls from this namespace */
3517 collect_ada_nodes (NAMESPACE_LEVEL (namespc)->names, source_file);
3519 /* Collect siblings, if any */
3520 collect_ada_namespace (TREE_CHAIN (namespc), source_file);
3522 /* Collect children, if any */
3523 collect_ada_namespace (NAMESPACE_LEVEL (namespc)->namespaces, source_file);
3526 /* Returns true iff there is a definition available for variable or
3530 decl_defined_p (tree decl)
3532 if (TREE_CODE (decl) == FUNCTION_DECL)
3533 return (DECL_INITIAL (decl) != NULL_TREE);
3536 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3537 return !DECL_EXTERNAL (decl);
3541 /* Complain that DECL uses a type with no linkage but is never defined. */
3544 no_linkage_error (tree decl)
3546 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3547 if (TYPE_ANONYMOUS_P (t))
3549 permerror (0, "%q+#D, declared using anonymous type, "
3550 "is used but never defined", decl);
3551 if (is_typedef_decl (TYPE_NAME (t)))
3552 permerror (0, "%q+#D does not refer to the unqualified type, "
3553 "so it is not used for linkage", TYPE_NAME (t));
3556 permerror (0, "%q+#D, declared using local type %qT, "
3557 "is used but never defined", decl, t);
3560 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
3563 collect_all_refs (const char *source_file)
3565 collect_ada_namespace (global_namespace, source_file);
3568 /* This routine is called at the end of compilation.
3569 Its job is to create all the code needed to initialize and
3570 destroy the global aggregates. We do the destruction
3571 first, since that way we only need to reverse the decls once. */
3574 cp_write_global_declarations (void)
3580 unsigned ssdf_count = 0;
3583 struct pointer_set_t *candidates;
3585 locus = input_location;
3588 /* Bad parse errors. Just forget about it. */
3589 if (! global_bindings_p () || current_class_type
3590 || !VEC_empty (tree,decl_namespace_list))
3594 c_common_write_pch ();
3596 /* Handle -fdump-ada-spec[-slim] */
3597 if (dump_enabled_p (TDI_ada))
3599 if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM)
3600 collect_source_ref (main_input_filename);
3602 collect_source_refs (global_namespace);
3604 dump_ada_specs (collect_all_refs, cpp_check);
3607 /* FIXME - huh? was input_line -= 1;*/
3609 /* We now have to write out all the stuff we put off writing out.
3612 o Template specializations that we have not yet instantiated,
3613 but which are needed.
3614 o Initialization and destruction for non-local objects with
3615 static storage duration. (Local objects with static storage
3616 duration are initialized when their scope is first entered,
3617 and are cleaned up via atexit.)
3618 o Virtual function tables.
3620 All of these may cause others to be needed. For example,
3621 instantiating one function may cause another to be needed, and
3622 generating the initializer for an object may cause templates to be
3623 instantiated, etc., etc. */
3625 timevar_push (TV_VARCONST);
3627 emit_support_tinfos ();
3636 /* If there are templates that we've put off instantiating, do
3638 instantiate_pending_templates (retries);
3641 /* Write out virtual tables as required. Note that writing out
3642 the virtual table for a template class may cause the
3643 instantiation of members of that class. If we write out
3644 vtables then we remove the class from our list so we don't
3645 have to look at it again. */
3647 while (keyed_classes != NULL_TREE
3648 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3651 keyed_classes = TREE_CHAIN (keyed_classes);
3657 tree next = TREE_CHAIN (t);
3661 if (maybe_emit_vtables (TREE_VALUE (next)))
3664 TREE_CHAIN (t) = TREE_CHAIN (next);
3669 next = TREE_CHAIN (t);
3673 /* Write out needed type info variables. We have to be careful
3674 looping through unemitted decls, because emit_tinfo_decl may
3675 cause other variables to be needed. New elements will be
3676 appended, and we remove from the vector those that actually
3678 for (i = VEC_length (tree, unemitted_tinfo_decls);
3679 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3680 if (emit_tinfo_decl (t))
3683 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3686 /* The list of objects with static storage duration is built up
3687 in reverse order. We clear STATIC_AGGREGATES so that any new
3688 aggregates added during the initialization of these will be
3689 initialized in the correct order when we next come around the
3691 vars = prune_vars_needing_no_initialization (&static_aggregates);
3695 /* We need to start a new initialization function each time
3696 through the loop. That's because we need to know which
3697 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3698 isn't computed until a function is finished, and written
3699 out. That's a deficiency in the back end. When this is
3700 fixed, these initialization functions could all become
3701 inline, with resulting performance improvements. */
3704 /* Set the line and file, so that it is obviously not from
3706 input_location = locus;
3707 ssdf_body = start_static_storage_duration_function (ssdf_count);
3709 /* Make sure the back end knows about all the variables. */
3710 write_out_vars (vars);
3712 /* First generate code to do all the initializations. */
3714 do_static_initialization_or_destruction (vars, /*initp=*/true);
3716 /* Then, generate code to do all the destructions. Do these
3717 in reverse order so that the most recently constructed
3718 variable is the first destroyed. If we're using
3719 __cxa_atexit, then we don't need to do this; functions
3720 were registered at initialization time to destroy the
3722 if (!flag_use_cxa_atexit && vars)
3724 vars = nreverse (vars);
3725 do_static_initialization_or_destruction (vars, /*initp=*/false);
3730 /* Finish up the static storage duration function for this
3732 input_location = locus;
3733 finish_static_storage_duration_function (ssdf_body);
3735 /* All those initializations and finalizations might cause
3736 us to need more inline functions, more template
3737 instantiations, etc. */
3740 /* ??? was: locus.line++; */
3743 /* Go through the set of inline functions whose bodies have not
3744 been emitted yet. If out-of-line copies of these functions
3745 are required, emit them. */
3746 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3748 /* Does it need synthesizing? */
3749 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3750 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3752 /* Even though we're already at the top-level, we push
3753 there again. That way, when we pop back a few lines
3754 hence, all of our state is restored. Otherwise,
3755 finish_function doesn't clean things up, and we end
3756 up with CURRENT_FUNCTION_DECL set. */
3757 push_to_top_level ();
3758 /* The decl's location will mark where it was first
3759 needed. Save that so synthesize method can indicate
3760 where it was needed from, in case of error */
3761 input_location = DECL_SOURCE_LOCATION (decl);
3762 synthesize_method (decl);
3763 pop_from_top_level ();
3767 if (!DECL_SAVED_TREE (decl))
3770 /* We lie to the back end, pretending that some functions
3771 are not defined when they really are. This keeps these
3772 functions from being put out unnecessarily. But, we must
3773 stop lying when the functions are referenced, or if they
3774 are not comdat since they need to be put out now. If
3775 DECL_INTERFACE_KNOWN, then we have already set
3776 DECL_EXTERNAL appropriately, so there's no need to check
3777 again, and we do not want to clear DECL_EXTERNAL if a
3778 previous call to import_export_decl set it.
3780 This is done in a separate for cycle, because if some
3781 deferred function is contained in another deferred
3782 function later in deferred_fns varray,
3783 rest_of_compilation would skip this function and we
3784 really cannot expand the same function twice. */
3785 import_export_decl (decl);
3786 if (DECL_NOT_REALLY_EXTERN (decl)
3787 && DECL_INITIAL (decl)
3788 && decl_needed_p (decl))
3790 struct cgraph_node *node = cgraph_get_node (decl), *alias, *next;
3792 DECL_EXTERNAL (decl) = 0;
3793 /* If we mark !DECL_EXTERNAL one of the same body aliases,
3794 we need to mark all of them that way. */
3795 if (node && node->same_body)
3797 DECL_EXTERNAL (node->decl) = 0;
3798 for (alias = node->same_body; alias; alias = alias->next)
3799 DECL_EXTERNAL (alias->decl) = 0;
3801 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3802 group, we need to mark all symbols in the same comdat group
3804 if (node->same_comdat_group)
3805 for (next = node->same_comdat_group;
3807 next = next->same_comdat_group)
3809 DECL_EXTERNAL (next->decl) = 0;
3810 if (next->same_body)
3812 for (alias = next->same_body;
3814 alias = alias->next)
3815 DECL_EXTERNAL (alias->decl) = 0;
3820 /* If we're going to need to write this function out, and
3821 there's already a body for it, create RTL for it now.
3822 (There might be no body if this is a method we haven't
3823 gotten around to synthesizing yet.) */
3824 if (!DECL_EXTERNAL (decl)
3825 && decl_needed_p (decl)
3826 && !TREE_ASM_WRITTEN (decl)
3827 && !cgraph_node (decl)->local.finalized)
3829 /* We will output the function; no longer consider it in this
3831 DECL_DEFER_OUTPUT (decl) = 0;
3832 /* Generate RTL for this function now that we know we
3834 expand_or_defer_fn (decl);
3835 /* If we're compiling -fsyntax-only pretend that this
3836 function has been written out so that we don't try to
3838 if (flag_syntax_only)
3839 TREE_ASM_WRITTEN (decl) = 1;
3844 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3847 /* Static data members are just like namespace-scope globals. */
3848 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3850 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3851 /* Don't write it out if we haven't seen a definition. */
3852 || DECL_IN_AGGR_P (decl))
3854 import_export_decl (decl);
3855 /* If this static data member is needed, provide it to the
3857 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3858 DECL_EXTERNAL (decl) = 0;
3860 if (VEC_length (tree, pending_statics) != 0
3861 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3862 VEC_length (tree, pending_statics)))
3869 /* All used inline functions must have a definition at this point. */
3870 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3872 if (/* Check online inline functions that were actually used. */
3873 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3874 /* If the definition actually was available here, then the
3875 fact that the function was not defined merely represents
3876 that for some reason (use of a template repository,
3877 #pragma interface, etc.) we decided not to emit the
3879 && !DECL_INITIAL (decl)
3880 /* An explicit instantiation can be used to specify
3881 that the body is in another unit. It will have
3882 already verified there was a definition. */
3883 && !DECL_EXPLICIT_INSTANTIATION (decl))
3885 warning (0, "inline function %q+D used but never defined", decl);
3886 /* Avoid a duplicate warning from check_global_declaration_1. */
3887 TREE_NO_WARNING (decl) = 1;
3891 /* So must decls that use a type with no linkage. */
3892 for (i = 0; VEC_iterate (tree, no_linkage_decls, i, decl); ++i)
3893 if (!decl_defined_p (decl))
3894 no_linkage_error (decl);
3896 /* We give C linkage to static constructors and destructors. */
3897 push_lang_context (lang_name_c);
3899 /* Generate initialization and destruction functions for all
3900 priorities for which they are required. */
3901 if (priority_info_map)
3902 splay_tree_foreach (priority_info_map,
3903 generate_ctor_and_dtor_functions_for_priority,
3905 else if (c_dialect_objc () && objc_static_init_needed_p ())
3906 /* If this is obj-c++ and we need a static init, call
3907 generate_ctor_or_dtor_function. */
3908 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3909 DEFAULT_INIT_PRIORITY, &locus);
3911 /* We're done with the splay-tree now. */
3912 if (priority_info_map)
3913 splay_tree_delete (priority_info_map);
3915 /* Generate any missing aliases. */
3916 maybe_apply_pending_pragma_weaks ();
3918 /* We're done with static constructors, so we can go back to "C++"
3920 pop_lang_context ();
3922 /* Collect candidates for Java hidden aliases. */
3923 candidates = collect_candidates_for_java_method_aliases ();
3925 cgraph_finalize_compilation_unit ();
3927 /* Now, issue warnings about static, but not defined, functions,
3928 etc., and emit debugging information. */
3929 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3930 if (VEC_length (tree, pending_statics) != 0)
3932 check_global_declarations (VEC_address (tree, pending_statics),
3933 VEC_length (tree, pending_statics));
3934 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3935 VEC_length (tree, pending_statics));
3938 /* Generate hidden aliases for Java. */
3941 build_java_method_aliases (candidates);
3942 pointer_set_destroy (candidates);
3947 /* The entire file is now complete. If requested, dump everything
3951 FILE *stream = dump_begin (TDI_tu, &flags);
3955 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3956 dump_end (TDI_tu, stream);
3960 timevar_pop (TV_VARCONST);
3962 if (flag_detailed_statistics)
3964 dump_tree_statistics ();
3965 dump_time_statistics ();
3967 input_location = locus;
3969 #ifdef ENABLE_CHECKING
3970 validate_conversion_obstack ();
3971 #endif /* ENABLE_CHECKING */
3974 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3975 function to call in parse-tree form; it has not yet been
3976 semantically analyzed. ARGS are the arguments to the function.
3977 They have already been semantically analyzed. This may change
3981 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
3984 VEC(tree,gc) *orig_args = NULL;
3989 object = TREE_OPERAND (fn, 0);
3991 if (processing_template_decl)
3993 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3994 || TREE_CODE (fn) == MEMBER_REF);
3995 if (type_dependent_expression_p (fn)
3996 || any_type_dependent_arguments_p (*args))
3997 return build_nt_call_vec (fn, *args);
3999 orig_args = make_tree_vector_copy (*args);
4001 /* Transform the arguments and add the implicit "this"
4002 parameter. That must be done before the FN is transformed
4003 because we depend on the form of FN. */
4004 make_args_non_dependent (*args);
4005 object = build_non_dependent_expr (object);
4006 if (TREE_CODE (fn) == DOTSTAR_EXPR)
4007 object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error);
4008 VEC_safe_insert (tree, gc, *args, 0, object);
4009 /* Now that the arguments are done, transform FN. */
4010 fn = build_non_dependent_expr (fn);
4013 /* A qualified name corresponding to a bound pointer-to-member is
4014 represented as an OFFSET_REF:
4016 struct B { void g(); };
4018 void B::g() { (this->*p)(); } */
4019 if (TREE_CODE (fn) == OFFSET_REF)
4021 tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0,
4022 tf_warning_or_error);
4023 fn = TREE_OPERAND (fn, 1);
4024 fn = get_member_function_from_ptrfunc (&object_addr, fn);
4025 VEC_safe_insert (tree, gc, *args, 0, object_addr);
4028 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
4029 if (processing_template_decl && expr != error_mark_node)
4030 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
4032 if (orig_args != NULL)
4033 release_tree_vector (orig_args);
4040 check_default_args (tree x)
4042 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
4043 bool saw_def = false;
4044 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
4045 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
4047 if (TREE_PURPOSE (arg))
4051 error ("default argument missing for parameter %P of %q+#D", i, x);
4052 TREE_PURPOSE (arg) = error_mark_node;
4057 /* Return true if function DECL can be inlined. This is used to force
4058 instantiation of methods that might be interesting for inlining. */
4060 possibly_inlined_p (tree decl)
4062 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
4063 if (DECL_UNINLINABLE (decl))
4065 if (!optimize || pragma_java_exceptions)
4066 return DECL_DECLARED_INLINE_P (decl);
4067 /* When optimizing, we might inline everything when flatten
4068 attribute or heuristics inlining for size or autoinlining
4073 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4074 If DECL is a specialization or implicitly declared class member,
4075 generate the actual definition. */
4078 mark_used (tree decl)
4080 HOST_WIDE_INT saved_processing_template_decl = 0;
4082 /* If DECL is a BASELINK for a single function, then treat it just
4083 like the DECL for the function. Otherwise, if the BASELINK is
4084 for an overloaded function, we don't know which function was
4085 actually used until after overload resolution. */
4086 if (TREE_CODE (decl) == BASELINK)
4088 decl = BASELINK_FUNCTIONS (decl);
4089 if (really_overloaded_fn (decl))
4091 decl = OVL_CURRENT (decl);
4094 /* Set TREE_USED for the benefit of -Wunused. */
4095 TREE_USED (decl) = 1;
4096 if (DECL_CLONED_FUNCTION_P (decl))
4097 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4099 if (TREE_CODE (decl) == FUNCTION_DECL
4100 && DECL_DELETED_FN (decl))
4102 if (DECL_ARTIFICIAL (decl))
4104 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
4105 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
4107 /* We mark a lambda conversion op as deleted if we can't
4108 generate it properly; see maybe_add_lambda_conv_op. */
4109 sorry ("converting lambda which uses %<...%> to "
4110 "function pointer");
4114 error ("deleted function %q+D", decl);
4115 error ("used here");
4118 /* If we don't need a value, then we don't need to synthesize DECL. */
4119 if (cp_unevaluated_operand != 0)
4122 /* We can only check DECL_ODR_USED on variables or functions with
4123 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4124 might need special handling for. */
4125 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4126 || DECL_LANG_SPECIFIC (decl) == NULL
4127 || DECL_THUNK_P (decl))
4130 /* We only want to do this processing once. We don't need to keep trying
4131 to instantiate inline templates, because unit-at-a-time will make sure
4132 we get them compiled before functions that want to inline them. */
4133 if (DECL_ODR_USED (decl))
4136 /* If within finish_function, defer the rest until that function
4137 finishes, otherwise it might recurse. */
4138 if (defer_mark_used_calls)
4140 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4144 /* Normally, we can wait until instantiation-time to synthesize
4145 DECL. However, if DECL is a static data member initialized with
4146 a constant, we need the value right now because a reference to
4147 such a data member is not value-dependent. */
4148 if (TREE_CODE (decl) == VAR_DECL
4149 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4150 && DECL_CLASS_SCOPE_P (decl))
4152 /* Don't try to instantiate members of dependent types. We
4153 cannot just use dependent_type_p here because this function
4154 may be called from fold_non_dependent_expr, and then we may
4155 see dependent types, even though processing_template_decl
4157 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
4158 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
4160 /* Pretend that we are not in a template, even if we are, so
4161 that the static data member initializer will be processed. */
4162 saved_processing_template_decl = processing_template_decl;
4163 processing_template_decl = 0;
4166 if (processing_template_decl)
4169 DECL_ODR_USED (decl) = 1;
4170 if (DECL_CLONED_FUNCTION_P (decl))
4171 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4173 /* DR 757: A type without linkage shall not be used as the type of a
4174 variable or function with linkage, unless
4175 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4176 o the variable or function is not used (3.2 [basic.def.odr]) or is
4177 defined in the same translation unit. */
4178 if (cxx_dialect > cxx98
4179 && decl_linkage (decl) != lk_none
4180 && !DECL_EXTERN_C_P (decl)
4181 && !DECL_ARTIFICIAL (decl)
4182 && !decl_defined_p (decl)
4183 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4185 if (is_local_extern (decl))
4186 /* There's no way to define a local extern, and adding it to
4187 the vector interferes with GC, so give an error now. */
4188 no_linkage_error (decl);
4190 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4193 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4194 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4195 /* Remember it, so we can check it was defined. */
4196 note_vague_linkage_fn (decl);
4198 /* Is it a synthesized method that needs to be synthesized? */
4199 if (TREE_CODE (decl) == FUNCTION_DECL
4200 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4201 && DECL_DEFAULTED_FN (decl)
4202 && ! DECL_INITIAL (decl))
4204 /* Remember the current location for a function we will end up
4205 synthesizing. Then we can inform the user where it was
4206 required in the case of error. */
4207 DECL_SOURCE_LOCATION (decl) = input_location;
4209 /* Synthesizing an implicitly defined member function will result in
4210 garbage collection. We must treat this situation as if we were
4211 within the body of a function so as to avoid collecting live data
4212 on the stack (such as overload resolution candidates).
4214 We could just let cp_write_global_declarations handle synthesizing
4215 this function, since we just added it to deferred_fns, but doing
4216 it at the use site produces better error messages. */
4218 synthesize_method (decl);
4220 /* If this is a synthesized method we don't need to
4221 do the instantiation test below. */
4223 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4224 && DECL_TEMPLATE_INFO (decl)
4225 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4226 || always_instantiate_p (decl)))
4227 /* If this is a function or variable that is an instance of some
4228 template, we now know that we will need to actually do the
4229 instantiation. We check that DECL is not an explicit
4230 instantiation because that is not checked in instantiate_decl.
4232 We put off instantiating functions in order to improve compile
4233 times. Maintaining a stack of active functions is expensive,
4234 and the inliner knows to instantiate any functions it might
4235 need. Therefore, we always try to defer instantiation. */
4236 instantiate_decl (decl, /*defer_ok=*/true,
4237 /*expl_inst_class_mem_p=*/false);
4239 processing_template_decl = saved_processing_template_decl;
4242 #include "gt-cp-decl2.h"