1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010,
4 2011 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
44 #include "c-family/c-common.h"
45 #include "c-family/c-objc.h"
46 #include "tree-mudflap.h"
48 #include "tree-inline.h"
49 #include "c-family/c-pragma.h"
50 #include "tree-dump.h"
53 #include "pointer-set.h"
54 #include "splay-tree.h"
55 #include "langhooks.h"
56 #include "c-family/c-ada-spec.h"
58 extern cpp_reader *parse_in;
60 /* This structure contains information about the initializations
61 and/or destructions required for a particular priority level. */
62 typedef struct priority_info_s {
63 /* Nonzero if there have been any initializations at this priority
64 throughout the translation unit. */
65 int initializations_p;
66 /* Nonzero if there have been any destructions at this priority
67 throughout the translation unit. */
71 static void mark_vtable_entries (tree);
72 static bool maybe_emit_vtables (tree);
73 static bool acceptable_java_type (tree);
74 static tree start_objects (int, int);
75 static void finish_objects (int, int, tree);
76 static tree start_static_storage_duration_function (unsigned);
77 static void finish_static_storage_duration_function (tree);
78 static priority_info get_priority_info (int);
79 static void do_static_initialization_or_destruction (tree, bool);
80 static void one_static_initialization_or_destruction (tree, tree, bool);
81 static void generate_ctor_or_dtor_function (bool, int, location_t *);
82 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
84 static tree prune_vars_needing_no_initialization (tree *);
85 static void write_out_vars (tree);
86 static void import_export_class (tree);
87 static tree get_guard_bits (tree);
88 static void determine_visibility_from_class (tree, tree);
89 static bool decl_defined_p (tree);
91 /* A list of static class variables. This is needed, because a
92 static class variable can be declared inside the class without
93 an initializer, and then initialized, statically, outside the class. */
94 static GTY(()) VEC(tree,gc) *pending_statics;
96 /* A list of functions which were declared inline, but which we
97 may need to emit outline anyway. */
98 static GTY(()) VEC(tree,gc) *deferred_fns;
100 /* A list of decls that use types with no linkage, which we need to make
102 static GTY(()) VEC(tree,gc) *no_linkage_decls;
104 /* Nonzero if we're done parsing and into end-of-file activities. */
110 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
111 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
112 that apply to the function). */
115 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
121 if (fntype == error_mark_node || ctype == error_mark_node)
122 return error_mark_node;
124 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
125 || TREE_CODE (fntype) == METHOD_TYPE);
127 type_quals = quals & ~TYPE_QUAL_RESTRICT;
128 ctype = cp_build_qualified_type (ctype, type_quals);
129 raises = TYPE_RAISES_EXCEPTIONS (fntype);
130 attrs = TYPE_ATTRIBUTES (fntype);
131 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
132 (TREE_CODE (fntype) == METHOD_TYPE
133 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
134 : TYPE_ARG_TYPES (fntype)));
136 fntype = build_exception_variant (fntype, raises);
138 fntype = cp_build_type_attribute_variant (fntype, attrs);
143 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
144 return type changed to NEW_RET. */
147 change_return_type (tree new_ret, tree fntype)
150 tree args = TYPE_ARG_TYPES (fntype);
151 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
152 tree attrs = TYPE_ATTRIBUTES (fntype);
154 if (same_type_p (new_ret, TREE_TYPE (fntype)))
157 if (TREE_CODE (fntype) == FUNCTION_TYPE)
159 newtype = build_function_type (new_ret, args);
160 newtype = apply_memfn_quals (newtype, type_memfn_quals (fntype));
163 newtype = build_method_type_directly
164 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype))),
165 new_ret, TREE_CHAIN (args));
167 newtype = build_exception_variant (newtype, raises);
169 newtype = cp_build_type_attribute_variant (newtype, attrs);
174 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
178 cp_build_parm_decl (tree name, tree type)
180 tree parm = build_decl (input_location,
181 PARM_DECL, name, type);
182 /* DECL_ARG_TYPE is only used by the back end and the back end never
184 if (!processing_template_decl)
185 DECL_ARG_TYPE (parm) = type_passed_as (type);
187 /* If the type is a pack expansion, then we have a function
189 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
190 FUNCTION_PARAMETER_PACK_P (parm) = 1;
195 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
199 build_artificial_parm (tree name, tree type)
201 tree parm = cp_build_parm_decl (name, type);
202 DECL_ARTIFICIAL (parm) = 1;
203 /* All our artificial parms are implicitly `const'; they cannot be
205 TREE_READONLY (parm) = 1;
209 /* Constructors for types with virtual baseclasses need an "in-charge" flag
210 saying whether this constructor is responsible for initialization of
211 virtual baseclasses or not. All destructors also need this "in-charge"
212 flag, which additionally determines whether or not the destructor should
213 free the memory for the object.
215 This function adds the "in-charge" flag to member function FN if
216 appropriate. It is called from grokclassfn and tsubst.
217 FN must be either a constructor or destructor.
219 The in-charge flag follows the 'this' parameter, and is followed by the
220 VTT parm (if any), then the user-written parms. */
223 maybe_retrofit_in_chrg (tree fn)
225 tree basetype, arg_types, parms, parm, fntype;
227 /* If we've already add the in-charge parameter don't do it again. */
228 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
231 /* When processing templates we can't know, in general, whether or
232 not we're going to have virtual baseclasses. */
233 if (processing_template_decl)
236 /* We don't need an in-charge parameter for constructors that don't
237 have virtual bases. */
238 if (DECL_CONSTRUCTOR_P (fn)
239 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
242 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
243 basetype = TREE_TYPE (TREE_VALUE (arg_types));
244 arg_types = TREE_CHAIN (arg_types);
246 parms = DECL_CHAIN (DECL_ARGUMENTS (fn));
248 /* If this is a subobject constructor or destructor, our caller will
249 pass us a pointer to our VTT. */
250 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
252 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
254 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
255 DECL_CHAIN (parm) = parms;
258 /* ...and then to TYPE_ARG_TYPES. */
259 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
261 DECL_HAS_VTT_PARM_P (fn) = 1;
264 /* Then add the in-charge parm (before the VTT parm). */
265 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
266 DECL_CHAIN (parm) = parms;
268 arg_types = hash_tree_chain (integer_type_node, arg_types);
270 /* Insert our new parameter(s) into the list. */
271 DECL_CHAIN (DECL_ARGUMENTS (fn)) = parms;
273 /* And rebuild the function type. */
274 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
276 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
277 fntype = build_exception_variant (fntype,
278 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
279 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
280 fntype = (cp_build_type_attribute_variant
281 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
282 TREE_TYPE (fn) = fntype;
284 /* Now we've got the in-charge parameter. */
285 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
288 /* Classes overload their constituent function names automatically.
289 When a function name is declared in a record structure,
290 its name is changed to it overloaded name. Since names for
291 constructors and destructors can conflict, we place a leading
294 CNAME is the name of the class we are grokking for.
296 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
298 FLAGS contains bits saying what's special about today's
299 arguments. DTOR_FLAG == DESTRUCTOR.
301 If FUNCTION is a destructor, then we must add the `auto-delete' field
302 as a second parameter. There is some hair associated with the fact
303 that we must "declare" this variable in the manner consistent with the
304 way the rest of the arguments were declared.
306 QUALS are the qualifiers for the this pointer. */
309 grokclassfn (tree ctype, tree function, enum overload_flags flags)
311 tree fn_name = DECL_NAME (function);
313 /* Even within an `extern "C"' block, members get C++ linkage. See
314 [dcl.link] for details. */
315 SET_DECL_LANGUAGE (function, lang_cplusplus);
317 if (fn_name == NULL_TREE)
319 error ("name missing for member function");
320 fn_name = get_identifier ("<anonymous>");
321 DECL_NAME (function) = fn_name;
324 DECL_CONTEXT (function) = ctype;
326 if (flags == DTOR_FLAG)
327 DECL_DESTRUCTOR_P (function) = 1;
329 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
330 maybe_retrofit_in_chrg (function);
333 /* Create an ARRAY_REF, checking for the user doing things backwards
337 grok_array_decl (tree array_expr, tree index_exp)
341 tree orig_array_expr = array_expr;
342 tree orig_index_exp = index_exp;
344 if (error_operand_p (array_expr) || error_operand_p (index_exp))
345 return error_mark_node;
347 if (processing_template_decl)
349 if (type_dependent_expression_p (array_expr)
350 || type_dependent_expression_p (index_exp))
351 return build_min_nt (ARRAY_REF, array_expr, index_exp,
352 NULL_TREE, NULL_TREE);
353 array_expr = build_non_dependent_expr (array_expr);
354 index_exp = build_non_dependent_expr (index_exp);
357 type = TREE_TYPE (array_expr);
359 type = non_reference (type);
361 /* If they have an `operator[]', use that. */
362 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
363 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
364 array_expr, index_exp, NULL_TREE,
365 /*overloaded_p=*/NULL, tf_warning_or_error);
370 /* Otherwise, create an ARRAY_REF for a pointer or array type.
371 It is a little-known fact that, if `a' is an array and `i' is
372 an int, you can write `i[a]', which means the same thing as
374 if (TREE_CODE (type) == ARRAY_TYPE)
377 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
379 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
382 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
384 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
386 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
389 if ((p1 && i2) && (i1 && p2))
390 error ("ambiguous conversion for array subscript");
393 array_expr = p1, index_exp = i2;
395 array_expr = p2, index_exp = i1;
398 error ("invalid types %<%T[%T]%> for array subscript",
399 type, TREE_TYPE (index_exp));
400 return error_mark_node;
403 if (array_expr == error_mark_node || index_exp == error_mark_node)
404 error ("ambiguous conversion for array subscript");
406 expr = build_array_ref (input_location, array_expr, index_exp);
408 if (processing_template_decl && expr != error_mark_node)
409 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
410 NULL_TREE, NULL_TREE);
414 /* Given the cast expression EXP, checking out its validity. Either return
415 an error_mark_node if there was an unavoidable error, return a cast to
416 void for trying to delete a pointer w/ the value 0, or return the
417 call to delete. If DOING_VEC is true, we handle things differently
418 for doing an array delete.
419 Implements ARM $5.3.4. This is called from the parser. */
422 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
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 DECL_IN_AGGR_P (decl) = 1;
777 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
778 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
779 SET_VAR_HAD_UNKNOWN_BOUND (decl);
781 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
784 /* DECLARATOR and DECLSPECS correspond to a class member. The other
785 parameters are as for cp_finish_decl. Return the DECL for the
786 class member declared. */
789 grokfield (const cp_declarator *declarator,
790 cp_decl_specifier_seq *declspecs,
791 tree init, bool init_const_expr_p,
796 const char *asmspec = 0;
797 int flags = LOOKUP_ONLYCONVERTING;
801 && TREE_CODE (init) == TREE_LIST
802 && TREE_VALUE (init) == error_mark_node
803 && TREE_CHAIN (init) == NULL_TREE)
806 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
807 if (! value || error_operand_p (value))
808 /* friend or constructor went bad. */
809 return error_mark_node;
811 if (TREE_CODE (value) == TYPE_DECL && init)
813 error ("typedef %qD is initialized (use decltype instead)", value);
817 /* Pass friendly classes back. */
818 if (value == void_type_node)
821 /* Pass friend decls back. */
822 if ((TREE_CODE (value) == FUNCTION_DECL
823 || TREE_CODE (value) == TEMPLATE_DECL)
824 && DECL_CONTEXT (value) != current_class_type)
827 name = DECL_NAME (value);
829 if (name != NULL_TREE)
831 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
833 error ("explicit template argument list not allowed");
834 return error_mark_node;
837 if (IDENTIFIER_POINTER (name)[0] == '_'
838 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
839 error ("member %qD conflicts with virtual function table field name",
843 /* Stash away type declarations. */
844 if (TREE_CODE (value) == TYPE_DECL)
846 DECL_NONLOCAL (value) = 1;
847 DECL_CONTEXT (value) = current_class_type;
849 if (processing_template_decl)
850 value = push_template_decl (value);
856 /* If this is a typedef that names the class for linkage purposes
857 (7.1.3p8), apply any attributes directly to the type. */
858 if (TAGGED_TYPE_P (TREE_TYPE (value))
859 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
860 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
862 cplus_decl_attributes (&value, attrlist, attrflags);
865 if (declspecs->specs[(int)ds_typedef]
866 && TREE_TYPE (value) != error_mark_node
867 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
868 set_underlying_type (value);
873 if (DECL_IN_AGGR_P (value))
875 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
876 return void_type_node;
879 if (asmspec_tree && asmspec_tree != error_mark_node)
880 asmspec = TREE_STRING_POINTER (asmspec_tree);
884 if (TREE_CODE (value) == FUNCTION_DECL)
886 /* Initializers for functions are rejected early in the parser.
887 If we get here, it must be a pure specifier for a method. */
888 if (init == ridpointers[(int)RID_DELETE])
890 DECL_DELETED_FN (value) = 1;
891 DECL_DECLARED_INLINE_P (value) = 1;
892 DECL_INITIAL (value) = error_mark_node;
894 else if (init == ridpointers[(int)RID_DEFAULT])
896 if (defaultable_fn_check (value))
898 DECL_DEFAULTED_FN (value) = 1;
899 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
900 DECL_DECLARED_INLINE_P (value) = 1;
903 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
905 if (integer_zerop (init))
906 DECL_PURE_VIRTUAL_P (value) = 1;
907 else if (error_operand_p (init))
908 ; /* An error has already been reported. */
910 error ("invalid initializer for member function %qD",
915 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
916 error ("initializer specified for static member function %qD",
920 else if (pedantic && TREE_CODE (value) != VAR_DECL)
921 /* Already complained in grokdeclarator. */
923 else if (!processing_template_decl)
925 if (TREE_CODE (init) == CONSTRUCTOR)
926 init = digest_init (TREE_TYPE (value), init);
927 init = maybe_constant_init (init);
929 if (init != error_mark_node && !TREE_CONSTANT (init))
931 /* We can allow references to things that are effectively
932 static, since references are initialized with the
934 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
935 || (TREE_STATIC (init) == 0
936 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
938 error ("field initializer is not constant");
939 init = error_mark_node;
945 if (processing_template_decl
946 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
948 value = push_template_decl (value);
949 if (error_operand_p (value))
950 return error_mark_node;
954 cplus_decl_attributes (&value, attrlist, 0);
956 switch (TREE_CODE (value))
959 finish_static_data_member_decl (value, init, init_const_expr_p,
960 asmspec_tree, flags);
965 error ("%<asm%> specifiers are not permitted on non-static data members");
966 if (DECL_INITIAL (value) == error_mark_node)
967 init = error_mark_node;
968 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
970 DECL_INITIAL (value) = init;
971 DECL_IN_AGGR_P (value) = 1;
976 set_user_assembler_name (value, asmspec);
978 cp_finish_decl (value,
980 /*init_const_expr_p=*/false,
981 asmspec_tree, flags);
983 /* Pass friends back this way. */
984 if (DECL_FRIEND_P (value))
985 return void_type_node;
987 DECL_IN_AGGR_P (value) = 1;
996 /* Like `grokfield', but for bitfields.
997 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1000 grokbitfield (const cp_declarator *declarator,
1001 cp_decl_specifier_seq *declspecs, tree width,
1004 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1006 if (value == error_mark_node)
1007 return NULL_TREE; /* friends went bad. */
1009 /* Pass friendly classes back. */
1010 if (TREE_CODE (value) == VOID_TYPE)
1011 return void_type_node;
1013 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
1014 && (POINTER_TYPE_P (value)
1015 || !dependent_type_p (TREE_TYPE (value))))
1017 error ("bit-field %qD with non-integral type", value);
1018 return error_mark_node;
1021 if (TREE_CODE (value) == TYPE_DECL)
1023 error ("cannot declare %qD to be a bit-field type", value);
1027 /* Usually, finish_struct_1 catches bitfields with invalid types.
1028 But, in the case of bitfields with function type, we confuse
1029 ourselves into thinking they are member functions, so we must
1031 if (TREE_CODE (value) == FUNCTION_DECL)
1033 error ("cannot declare bit-field %qD with function type",
1038 if (DECL_IN_AGGR_P (value))
1040 error ("%qD is already defined in the class %qT", value,
1041 DECL_CONTEXT (value));
1042 return void_type_node;
1045 if (TREE_STATIC (value))
1047 error ("static member %qD cannot be a bit-field", value);
1050 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1052 if (width != error_mark_node)
1054 /* The width must be an integer type. */
1055 if (!type_dependent_expression_p (width)
1056 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width)))
1057 error ("width of bit-field %qD has non-integral type %qT", value,
1059 DECL_INITIAL (value) = width;
1060 SET_DECL_C_BIT_FIELD (value);
1063 DECL_IN_AGGR_P (value) = 1;
1066 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1072 /* Returns true iff ATTR is an attribute which needs to be applied at
1073 instantiation time rather than template definition time. */
1076 is_late_template_attribute (tree attr, tree decl)
1078 tree name = TREE_PURPOSE (attr);
1079 tree args = TREE_VALUE (attr);
1080 const struct attribute_spec *spec = lookup_attribute_spec (name);
1084 /* Unknown attribute. */
1087 /* Attribute weak handling wants to write out assembly right away. */
1088 if (is_attribute_p ("weak", name))
1091 /* If any of the arguments are dependent expressions, we can't evaluate
1092 the attribute until instantiation time. */
1093 for (arg = args; arg; arg = TREE_CHAIN (arg))
1095 tree t = TREE_VALUE (arg);
1097 /* If the first attribute argument is an identifier, only consider
1098 second and following arguments. Attributes like mode, format,
1099 cleanup and several target specific attributes aren't late
1100 just because they have an IDENTIFIER_NODE as first argument. */
1101 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1104 if (value_dependent_expression_p (t)
1105 || type_dependent_expression_p (t))
1109 if (TREE_CODE (decl) == TYPE_DECL
1111 || spec->type_required)
1113 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1115 /* We can't apply any attributes to a completely unknown type until
1116 instantiation time. */
1117 enum tree_code code = TREE_CODE (type);
1118 if (code == TEMPLATE_TYPE_PARM
1119 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1120 || code == TYPENAME_TYPE)
1122 /* Also defer most attributes on dependent types. This is not
1123 necessary in all cases, but is the better default. */
1124 else if (dependent_type_p (type)
1125 /* But attribute visibility specifically works on
1127 && !is_attribute_p ("visibility", name))
1136 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1137 applied at instantiation time and return them. If IS_DEPENDENT is true,
1138 the declaration itself is dependent, so all attributes should be applied
1139 at instantiation time. */
1142 splice_template_attributes (tree *attr_p, tree decl)
1145 tree late_attrs = NULL_TREE;
1146 tree *q = &late_attrs;
1153 if (is_late_template_attribute (*p, decl))
1155 ATTR_IS_DEPENDENT (*p) = 1;
1157 *p = TREE_CHAIN (*p);
1158 q = &TREE_CHAIN (*q);
1162 p = &TREE_CHAIN (*p);
1168 /* Remove any late attributes from the list in ATTR_P and attach them to
1172 save_template_attributes (tree *attr_p, tree *decl_p)
1174 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1176 tree old_attrs = NULL_TREE;
1181 if (DECL_P (*decl_p))
1182 q = &DECL_ATTRIBUTES (*decl_p);
1184 q = &TYPE_ATTRIBUTES (*decl_p);
1188 /* Place the late attributes at the beginning of the attribute
1190 TREE_CHAIN (tree_last (late_attrs)) = *q;
1193 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1195 /* We've added new attributes directly to the main variant, so
1196 now we need to update all of the other variants to include
1197 these new attributes. */
1199 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1200 variant = TYPE_NEXT_VARIANT (variant))
1202 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1203 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1208 /* Like reconstruct_complex_type, but handle also template trees. */
1211 cp_reconstruct_complex_type (tree type, tree bottom)
1215 if (TREE_CODE (type) == POINTER_TYPE)
1217 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1218 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1219 TYPE_REF_CAN_ALIAS_ALL (type));
1221 else if (TREE_CODE (type) == REFERENCE_TYPE)
1223 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1224 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1225 TYPE_REF_CAN_ALIAS_ALL (type));
1227 else if (TREE_CODE (type) == ARRAY_TYPE)
1229 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1230 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1231 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1232 element type qualification will be handled by the recursive
1233 cp_reconstruct_complex_type call and cp_build_qualified_type
1234 for ARRAY_TYPEs changes the element type. */
1237 else if (TREE_CODE (type) == FUNCTION_TYPE)
1239 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1240 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1241 outer = apply_memfn_quals (outer, type_memfn_quals (type));
1243 else if (TREE_CODE (type) == METHOD_TYPE)
1245 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1246 /* The build_method_type_directly() routine prepends 'this' to argument list,
1247 so we must compensate by getting rid of it. */
1249 = build_method_type_directly
1250 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1252 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1254 else if (TREE_CODE (type) == OFFSET_TYPE)
1256 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1257 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1262 if (TYPE_ATTRIBUTES (type))
1263 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1264 return cp_build_qualified_type (outer, cp_type_quals (type));
1267 /* Like decl_attributes, but handle C++ complexity. */
1270 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1272 if (*decl == NULL_TREE || *decl == void_type_node
1273 || *decl == error_mark_node
1274 || attributes == NULL_TREE)
1277 if (processing_template_decl)
1279 if (check_for_bare_parameter_packs (attributes))
1282 save_template_attributes (&attributes, decl);
1283 if (attributes == NULL_TREE)
1287 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1288 decl = &DECL_TEMPLATE_RESULT (*decl);
1290 decl_attributes (decl, attributes, flags);
1292 if (TREE_CODE (*decl) == TYPE_DECL)
1293 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1296 /* Walks through the namespace- or function-scope anonymous union
1297 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1298 Returns one of the fields for use in the mangled name. */
1301 build_anon_union_vars (tree type, tree object)
1303 tree main_decl = NULL_TREE;
1306 /* Rather than write the code to handle the non-union case,
1307 just give an error. */
1308 if (TREE_CODE (type) != UNION_TYPE)
1309 error ("anonymous struct not inside named type");
1311 for (field = TYPE_FIELDS (type);
1313 field = DECL_CHAIN (field))
1318 if (DECL_ARTIFICIAL (field))
1320 if (TREE_CODE (field) != FIELD_DECL)
1322 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1323 "have non-static data members", field);
1327 if (TREE_PRIVATE (field))
1328 permerror (input_location, "private member %q+#D in anonymous union", field);
1329 else if (TREE_PROTECTED (field))
1330 permerror (input_location, "protected member %q+#D in anonymous union", field);
1332 if (processing_template_decl)
1333 ref = build_min_nt (COMPONENT_REF, object,
1334 DECL_NAME (field), NULL_TREE);
1336 ref = build_class_member_access_expr (object, field, NULL_TREE,
1337 false, tf_warning_or_error);
1339 if (DECL_NAME (field))
1343 decl = build_decl (input_location,
1344 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1345 DECL_ANON_UNION_VAR_P (decl) = 1;
1346 DECL_ARTIFICIAL (decl) = 1;
1348 base = get_base_address (object);
1349 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1350 TREE_STATIC (decl) = TREE_STATIC (base);
1351 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1353 SET_DECL_VALUE_EXPR (decl, ref);
1354 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1356 decl = pushdecl (decl);
1358 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1359 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1363 if (main_decl == NULL_TREE)
1370 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1371 anonymous union, then all members must be laid out together. PUBLIC_P
1372 is nonzero if this union is not declared static. */
1375 finish_anon_union (tree anon_union_decl)
1381 if (anon_union_decl == error_mark_node)
1384 type = TREE_TYPE (anon_union_decl);
1385 public_p = TREE_PUBLIC (anon_union_decl);
1387 /* The VAR_DECL's context is the same as the TYPE's context. */
1388 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1390 if (TYPE_FIELDS (type) == NULL_TREE)
1395 error ("namespace-scope anonymous aggregates must be static");
1399 main_decl = build_anon_union_vars (type, anon_union_decl);
1400 if (main_decl == error_mark_node)
1402 if (main_decl == NULL_TREE)
1404 warning (0, "anonymous union with no members");
1408 if (!processing_template_decl)
1410 /* Use main_decl to set the mangled name. */
1411 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1412 maybe_commonize_var (anon_union_decl);
1413 if (TREE_STATIC (anon_union_decl) || DECL_EXTERNAL (anon_union_decl))
1414 mangle_decl (anon_union_decl);
1415 DECL_NAME (anon_union_decl) = NULL_TREE;
1418 pushdecl (anon_union_decl);
1419 if (building_stmt_tree ()
1420 && at_function_scope_p ())
1421 add_decl_expr (anon_union_decl);
1422 else if (!processing_template_decl)
1423 rest_of_decl_compilation (anon_union_decl,
1424 toplevel_bindings_p (), at_eof);
1427 /* Auxiliary functions to make type signatures for
1428 `operator new' and `operator delete' correspond to
1429 what compiler will be expecting. */
1432 coerce_new_type (tree type)
1435 tree args = TYPE_ARG_TYPES (type);
1437 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1439 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1442 error ("%<operator new%> must return type %qT", ptr_type_node);
1445 if (args && args != void_list_node)
1447 if (TREE_PURPOSE (args))
1449 /* [basic.stc.dynamic.allocation]
1451 The first parameter shall not have an associated default
1453 error ("the first parameter of %<operator new%> cannot "
1454 "have a default argument");
1455 /* Throw away the default argument. */
1456 TREE_PURPOSE (args) = NULL_TREE;
1459 if (!same_type_p (TREE_VALUE (args), size_type_node))
1462 args = TREE_CHAIN (args);
1469 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1470 "as first parameter", size_type_node);
1475 args = tree_cons (NULL_TREE, size_type_node, args);
1478 type = build_exception_variant
1479 (build_function_type (ptr_type_node, args),
1480 TYPE_RAISES_EXCEPTIONS (type));
1488 coerce_delete_type (tree type)
1491 tree args = TYPE_ARG_TYPES (type);
1493 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1495 if (!same_type_p (TREE_TYPE (type), void_type_node))
1498 error ("%<operator delete%> must return type %qT", void_type_node);
1501 if (!args || args == void_list_node
1502 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1505 if (args && args != void_list_node)
1506 args = TREE_CHAIN (args);
1507 error ("%<operator delete%> takes type %qT as first parameter",
1513 args = tree_cons (NULL_TREE, ptr_type_node, args);
1516 type = build_exception_variant
1517 (build_function_type (void_type_node, args),
1518 TYPE_RAISES_EXCEPTIONS (type));
1526 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1527 and mark them as needed. */
1530 mark_vtable_entries (tree decl)
1533 unsigned HOST_WIDE_INT idx;
1535 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1540 STRIP_NOPS (fnaddr);
1542 if (TREE_CODE (fnaddr) != ADDR_EXPR
1543 && TREE_CODE (fnaddr) != FDESC_EXPR)
1544 /* This entry is an offset: a virtual base class offset, a
1545 virtual call offset, an RTTI offset, etc. */
1548 fn = TREE_OPERAND (fnaddr, 0);
1549 TREE_ADDRESSABLE (fn) = 1;
1550 /* When we don't have vcall offsets, we output thunks whenever
1551 we output the vtables that contain them. With vcall offsets,
1552 we know all the thunks we'll need when we emit a virtual
1553 function, so we emit the thunks there instead. */
1554 if (DECL_THUNK_P (fn))
1555 use_thunk (fn, /*emit_p=*/0);
1560 /* Set DECL up to have the closest approximation of "initialized common"
1561 linkage available. */
1564 comdat_linkage (tree decl)
1567 make_decl_one_only (decl, cxx_comdat_group (decl));
1568 else if (TREE_CODE (decl) == FUNCTION_DECL
1569 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1570 /* We can just emit function and compiler-generated variables
1571 statically; having multiple copies is (for the most part) only
1574 There are two correctness issues, however: the address of a
1575 template instantiation with external linkage should be the
1576 same, independent of what translation unit asks for the
1577 address, and this will not hold when we emit multiple copies of
1578 the function. However, there's little else we can do.
1580 Also, by default, the typeinfo implementation assumes that
1581 there will be only one copy of the string used as the name for
1582 each type. Therefore, if weak symbols are unavailable, the
1583 run-time library should perform a more conservative check; it
1584 should perform a string comparison, rather than an address
1586 TREE_PUBLIC (decl) = 0;
1589 /* Static data member template instantiations, however, cannot
1590 have multiple copies. */
1591 if (DECL_INITIAL (decl) == 0
1592 || DECL_INITIAL (decl) == error_mark_node)
1593 DECL_COMMON (decl) = 1;
1594 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1596 DECL_COMMON (decl) = 1;
1597 DECL_INITIAL (decl) = error_mark_node;
1599 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1601 /* We can't do anything useful; leave vars for explicit
1603 DECL_EXTERNAL (decl) = 1;
1604 DECL_NOT_REALLY_EXTERN (decl) = 0;
1608 DECL_COMDAT (decl) = 1;
1611 /* For win32 we also want to put explicit instantiations in
1612 linkonce sections, so that they will be merged with implicit
1613 instantiations; otherwise we get duplicate symbol errors.
1614 For Darwin we do not want explicit instantiations to be
1618 maybe_make_one_only (tree decl)
1620 /* We used to say that this was not necessary on targets that support weak
1621 symbols, because the implicit instantiations will defer to the explicit
1622 one. However, that's not actually the case in SVR4; a strong definition
1623 after a weak one is an error. Also, not making explicit
1624 instantiations one_only means that we can end up with two copies of
1625 some template instantiations. */
1629 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1630 we can get away with not emitting them if they aren't used. We need
1631 to for variables so that cp_finish_decl will update their linkage,
1632 because their DECL_INITIAL may not have been set properly yet. */
1634 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1635 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1636 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1638 make_decl_one_only (decl, cxx_comdat_group (decl));
1640 if (TREE_CODE (decl) == VAR_DECL)
1642 DECL_COMDAT (decl) = 1;
1643 /* Mark it needed so we don't forget to emit it. */
1644 mark_decl_referenced (decl);
1649 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1650 This predicate will give the right answer during parsing of the
1651 function, which other tests may not. */
1654 vague_linkage_p (tree decl)
1656 /* Unfortunately, import_export_decl has not always been called
1657 before the function is processed, so we cannot simply check
1659 return (DECL_COMDAT (decl)
1660 || (((TREE_CODE (decl) == FUNCTION_DECL
1661 && DECL_DECLARED_INLINE_P (decl))
1662 || (DECL_LANG_SPECIFIC (decl)
1663 && DECL_TEMPLATE_INSTANTIATION (decl)))
1664 && TREE_PUBLIC (decl)));
1667 /* Determine whether or not we want to specifically import or export CTYPE,
1668 using various heuristics. */
1671 import_export_class (tree ctype)
1673 /* -1 for imported, 1 for exported. */
1674 int import_export = 0;
1676 /* It only makes sense to call this function at EOF. The reason is
1677 that this function looks at whether or not the first non-inline
1678 non-abstract virtual member function has been defined in this
1679 translation unit. But, we can't possibly know that until we've
1680 seen the entire translation unit. */
1681 gcc_assert (at_eof);
1683 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1686 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1687 we will have CLASSTYPE_INTERFACE_ONLY set but not
1688 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1689 heuristic because someone will supply a #pragma implementation
1690 elsewhere, and deducing it here would produce a conflict. */
1691 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1694 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1696 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1698 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1699 && !flag_implicit_templates)
1700 /* For a template class, without -fimplicit-templates, check the
1701 repository. If the virtual table is assigned to this
1702 translation unit, then export the class; otherwise, import
1704 import_export = repo_export_class_p (ctype) ? 1 : -1;
1705 else if (TYPE_POLYMORPHIC_P (ctype))
1707 /* The ABI specifies that the virtual table and associated
1708 information are emitted with the key method, if any. */
1709 tree method = CLASSTYPE_KEY_METHOD (ctype);
1710 /* If weak symbol support is not available, then we must be
1711 careful not to emit the vtable when the key function is
1712 inline. An inline function can be defined in multiple
1713 translation units. If we were to emit the vtable in each
1714 translation unit containing a definition, we would get
1715 multiple definition errors at link-time. */
1716 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1717 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1720 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1721 a definition anywhere else. */
1722 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1725 /* Allow back ends the chance to overrule the decision. */
1726 if (targetm.cxx.import_export_class)
1727 import_export = targetm.cxx.import_export_class (ctype, import_export);
1731 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1732 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1736 /* Return true if VAR has already been provided to the back end; in that
1737 case VAR should not be modified further by the front end. */
1739 var_finalized_p (tree var)
1741 return varpool_node (var)->finalized;
1744 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1745 must be emitted in this translation unit. Mark it as such. */
1748 mark_needed (tree decl)
1750 /* It's possible that we no longer need to set
1751 TREE_SYMBOL_REFERENCED here directly, but doing so is
1753 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1754 mark_decl_referenced (decl);
1757 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1758 returns true if a definition of this entity should be provided in
1759 this object file. Callers use this function to determine whether
1760 or not to let the back end know that a definition of DECL is
1761 available in this translation unit. */
1764 decl_needed_p (tree decl)
1766 gcc_assert (TREE_CODE (decl) == VAR_DECL
1767 || TREE_CODE (decl) == FUNCTION_DECL);
1768 /* This function should only be called at the end of the translation
1769 unit. We cannot be sure of whether or not something will be
1770 COMDAT until that point. */
1771 gcc_assert (at_eof);
1773 /* All entities with external linkage that are not COMDAT should be
1774 emitted; they may be referred to from other object files. */
1775 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1777 /* If this entity was used, let the back end see it; it will decide
1778 whether or not to emit it into the object file. */
1779 if (TREE_USED (decl)
1780 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1781 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1783 /* Functions marked "dllexport" must be emitted so that they are
1784 visible to other DLLs. */
1785 if (flag_keep_inline_dllexport
1786 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1788 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1789 reference to DECL might cause it to be emitted later. */
1793 /* If necessary, write out the vtables for the dynamic class CTYPE.
1794 Returns true if any vtables were emitted. */
1797 maybe_emit_vtables (tree ctype)
1802 struct varpool_node *current = NULL, *last = NULL, *first = NULL;
1804 /* If the vtables for this class have already been emitted there is
1805 nothing more to do. */
1806 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1807 if (var_finalized_p (primary_vtbl))
1809 /* Ignore dummy vtables made by get_vtable_decl. */
1810 if (TREE_TYPE (primary_vtbl) == void_type_node)
1813 /* On some targets, we cannot determine the key method until the end
1814 of the translation unit -- which is when this function is
1816 if (!targetm.cxx.key_method_may_be_inline ())
1817 determine_key_method (ctype);
1819 /* See if any of the vtables are needed. */
1820 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1822 import_export_decl (vtbl);
1823 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1828 /* If the references to this class' vtables are optimized away,
1829 still emit the appropriate debugging information. See
1831 if (DECL_COMDAT (primary_vtbl)
1832 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1833 note_debug_info_needed (ctype);
1837 /* The ABI requires that we emit all of the vtables if we emit any
1839 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1841 /* Mark entities references from the virtual table as used. */
1842 mark_vtable_entries (vtbl);
1844 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1846 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1848 /* It had better be all done at compile-time. */
1853 DECL_EXTERNAL (vtbl) = 0;
1854 rest_of_decl_compilation (vtbl, 1, 1);
1856 /* Because we're only doing syntax-checking, we'll never end up
1857 actually marking the variable as written. */
1858 if (flag_syntax_only)
1859 TREE_ASM_WRITTEN (vtbl) = 1;
1860 else if (DECL_COMDAT (vtbl))
1862 current = varpool_node (vtbl);
1864 last->same_comdat_group = current;
1872 last->same_comdat_group = first;
1874 /* Since we're writing out the vtable here, also write the debug
1876 note_debug_info_needed (ctype);
1881 /* A special return value from type_visibility meaning internal
1884 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1886 /* walk_tree helper function for type_visibility. */
1889 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1891 int *vis_p = (int *)data;
1896 else if (CLASS_TYPE_P (*tp))
1898 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1900 *vis_p = VISIBILITY_ANON;
1903 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1904 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1909 /* Returns the visibility of TYPE, which is the minimum visibility of its
1913 type_visibility (tree type)
1915 int vis = VISIBILITY_DEFAULT;
1916 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1920 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1921 specified (or if VISIBILITY is static). */
1924 constrain_visibility (tree decl, int visibility)
1926 if (visibility == VISIBILITY_ANON)
1928 /* extern "C" declarations aren't affected by the anonymous
1930 if (!DECL_EXTERN_C_P (decl))
1932 TREE_PUBLIC (decl) = 0;
1933 DECL_WEAK (decl) = 0;
1934 DECL_COMMON (decl) = 0;
1935 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1936 DECL_INTERFACE_KNOWN (decl) = 1;
1937 if (DECL_LANG_SPECIFIC (decl))
1938 DECL_NOT_REALLY_EXTERN (decl) = 1;
1941 else if (visibility > DECL_VISIBILITY (decl)
1942 && !DECL_VISIBILITY_SPECIFIED (decl))
1944 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1950 /* Constrain the visibility of DECL based on the visibility of its template
1954 constrain_visibility_for_template (tree decl, tree targs)
1956 /* If this is a template instantiation, check the innermost
1957 template args for visibility constraints. The outer template
1958 args are covered by the class check. */
1959 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1961 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1965 tree arg = TREE_VEC_ELT (args, i-1);
1967 vis = type_visibility (arg);
1968 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1971 if (TREE_CODE (arg) == ADDR_EXPR)
1972 arg = TREE_OPERAND (arg, 0);
1973 if (TREE_CODE (arg) == VAR_DECL
1974 || TREE_CODE (arg) == FUNCTION_DECL)
1976 if (! TREE_PUBLIC (arg))
1977 vis = VISIBILITY_ANON;
1979 vis = DECL_VISIBILITY (arg);
1983 constrain_visibility (decl, vis);
1987 /* Like c_determine_visibility, but with additional C++-specific
1990 Function-scope entities can rely on the function's visibility because
1991 it is set in start_preparsed_function.
1993 Class-scope entities cannot rely on the class's visibility until the end
1994 of the enclosing class definition.
1996 Note that because namespaces have multiple independent definitions,
1997 namespace visibility is handled elsewhere using the #pragma visibility
1998 machinery rather than by decorating the namespace declaration.
2000 The goal is for constraints from the type to give a diagnostic, and
2001 other constraints to be applied silently. */
2004 determine_visibility (tree decl)
2006 tree class_type = NULL_TREE;
2008 bool orig_visibility_specified;
2009 enum symbol_visibility orig_visibility;
2011 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2013 /* Only relevant for names with external linkage. */
2014 if (!TREE_PUBLIC (decl))
2017 /* Cloned constructors and destructors get the same visibility as
2018 the underlying function. That should be set up in
2019 maybe_clone_body. */
2020 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2022 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2023 orig_visibility = DECL_VISIBILITY (decl);
2025 if (TREE_CODE (decl) == TYPE_DECL)
2027 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2028 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2029 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2034 else if (DECL_LANG_SPECIFIC (decl))
2035 use_template = DECL_USE_TEMPLATE (decl);
2039 /* If DECL is a member of a class, visibility specifiers on the
2040 class can influence the visibility of the DECL. */
2041 if (DECL_CLASS_SCOPE_P (decl))
2042 class_type = DECL_CONTEXT (decl);
2045 /* Not a class member. */
2047 /* Virtual tables have DECL_CONTEXT set to their associated class,
2048 so they are automatically handled above. */
2049 gcc_assert (TREE_CODE (decl) != VAR_DECL
2050 || !DECL_VTABLE_OR_VTT_P (decl));
2052 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2054 /* Local statics and classes get the visibility of their
2055 containing function by default, except that
2056 -fvisibility-inlines-hidden doesn't affect them. */
2057 tree fn = DECL_CONTEXT (decl);
2058 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2060 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2061 DECL_VISIBILITY_SPECIFIED (decl) =
2062 DECL_VISIBILITY_SPECIFIED (fn);
2065 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2067 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2068 but have no TEMPLATE_INFO, so don't try to check it. */
2071 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2072 && flag_visibility_ms_compat)
2074 /* Under -fvisibility-ms-compat, types are visible by default,
2075 even though their contents aren't. */
2076 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2077 int underlying_vis = type_visibility (underlying_type);
2078 if (underlying_vis == VISIBILITY_ANON
2079 || (CLASS_TYPE_P (underlying_type)
2080 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type)))
2081 constrain_visibility (decl, underlying_vis);
2083 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2085 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2087 /* tinfo visibility is based on the type it's for. */
2088 constrain_visibility
2089 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2091 /* Give the target a chance to override the visibility associated
2093 if (TREE_PUBLIC (decl)
2094 && !DECL_REALLY_EXTERN (decl)
2095 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2096 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2097 targetm.cxx.determine_class_data_visibility (decl);
2099 else if (use_template)
2100 /* Template instantiations and specializations get visibility based
2101 on their template unless they override it with an attribute. */;
2102 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2104 /* Set default visibility to whatever the user supplied with
2105 #pragma GCC visibility or a namespace visibility attribute. */
2106 DECL_VISIBILITY (decl) = default_visibility;
2107 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2113 /* If the specialization doesn't specify visibility, use the
2114 visibility from the template. */
2115 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2116 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2117 : DECL_TEMPLATE_INFO (decl));
2118 tree args = TI_ARGS (tinfo);
2120 if (args != error_mark_node)
2122 int depth = TMPL_ARGS_DEPTH (args);
2123 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2125 if (!DECL_VISIBILITY_SPECIFIED (decl))
2127 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2128 DECL_VISIBILITY_SPECIFIED (decl)
2129 = DECL_VISIBILITY_SPECIFIED (pattern);
2132 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2133 if (args && depth > template_class_depth (class_type))
2134 /* Limit visibility based on its template arguments. */
2135 constrain_visibility_for_template (decl, args);
2140 determine_visibility_from_class (decl, class_type);
2142 if (decl_anon_ns_mem_p (decl))
2143 /* Names in an anonymous namespace get internal linkage.
2144 This might change once we implement export. */
2145 constrain_visibility (decl, VISIBILITY_ANON);
2146 else if (TREE_CODE (decl) != TYPE_DECL)
2148 /* Propagate anonymity from type to decl. */
2149 int tvis = type_visibility (TREE_TYPE (decl));
2150 if (tvis == VISIBILITY_ANON
2151 || ! DECL_VISIBILITY_SPECIFIED (decl))
2152 constrain_visibility (decl, tvis);
2154 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2155 /* DR 757: A type without linkage shall not be used as the type of a
2156 variable or function with linkage, unless
2157 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2158 o the variable or function is not used (3.2 [basic.def.odr]) or is
2159 defined in the same translation unit.
2161 Since non-extern "C" decls need to be defined in the same
2162 translation unit, we can make the type internal. */
2163 constrain_visibility (decl, VISIBILITY_ANON);
2165 /* If visibility changed and DECL already has DECL_RTL, ensure
2166 symbol flags are updated. */
2167 if ((DECL_VISIBILITY (decl) != orig_visibility
2168 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2169 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2170 || TREE_CODE (decl) == FUNCTION_DECL)
2171 && DECL_RTL_SET_P (decl))
2172 make_decl_rtl (decl);
2175 /* By default, static data members and function members receive
2176 the visibility of their containing class. */
2179 determine_visibility_from_class (tree decl, tree class_type)
2181 if (DECL_VISIBILITY_SPECIFIED (decl))
2184 if (visibility_options.inlines_hidden
2185 /* Don't do this for inline templates; specializations might not be
2186 inline, and we don't want them to inherit the hidden
2187 visibility. We'll set it here for all inline instantiations. */
2188 && !processing_template_decl
2189 && TREE_CODE (decl) == FUNCTION_DECL
2190 && DECL_DECLARED_INLINE_P (decl)
2191 && (! DECL_LANG_SPECIFIC (decl)
2192 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2193 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2196 /* Default to the class visibility. */
2197 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2198 DECL_VISIBILITY_SPECIFIED (decl)
2199 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2202 /* Give the target a chance to override the visibility associated
2204 if (TREE_CODE (decl) == VAR_DECL
2205 && (DECL_TINFO_P (decl)
2206 || (DECL_VTABLE_OR_VTT_P (decl)
2207 /* Construction virtual tables are not exported because
2208 they cannot be referred to from other object files;
2209 their name is not standardized by the ABI. */
2210 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2211 && TREE_PUBLIC (decl)
2212 && !DECL_REALLY_EXTERN (decl)
2213 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2214 targetm.cxx.determine_class_data_visibility (decl);
2217 /* Constrain the visibility of a class TYPE based on the visibility of its
2218 field types. Warn if any fields require lesser visibility. */
2221 constrain_class_visibility (tree type)
2227 int vis = type_visibility (type);
2229 if (vis == VISIBILITY_ANON
2230 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2233 /* Don't warn about visibility if the class has explicit visibility. */
2234 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2235 vis = VISIBILITY_INTERNAL;
2237 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
2238 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2240 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2241 int subvis = type_visibility (ftype);
2243 if (subvis == VISIBILITY_ANON)
2245 if (!in_main_input_context ())
2247 %qT has a field %qD whose type uses the anonymous namespace",
2250 else if (MAYBE_CLASS_TYPE_P (ftype)
2251 && vis < VISIBILITY_HIDDEN
2252 && subvis >= VISIBILITY_HIDDEN)
2253 warning (OPT_Wattributes, "\
2254 %qT declared with greater visibility than the type of its field %qD",
2258 binfo = TYPE_BINFO (type);
2259 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2261 int subvis = type_visibility (TREE_TYPE (t));
2263 if (subvis == VISIBILITY_ANON)
2265 if (!in_main_input_context())
2267 %qT has a base %qT whose type uses the anonymous namespace",
2268 type, TREE_TYPE (t));
2270 else if (vis < VISIBILITY_HIDDEN
2271 && subvis >= VISIBILITY_HIDDEN)
2272 warning (OPT_Wattributes, "\
2273 %qT declared with greater visibility than its base %qT",
2274 type, TREE_TYPE (t));
2278 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2279 for DECL has not already been determined, do so now by setting
2280 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2281 function is called entities with vague linkage whose definitions
2282 are available must have TREE_PUBLIC set.
2284 If this function decides to place DECL in COMDAT, it will set
2285 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2286 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2287 callers defer that decision until it is clear that DECL is actually
2291 import_export_decl (tree decl)
2296 tree class_type = NULL_TREE;
2298 if (DECL_INTERFACE_KNOWN (decl))
2301 /* We cannot determine what linkage to give to an entity with vague
2302 linkage until the end of the file. For example, a virtual table
2303 for a class will be defined if and only if the key method is
2304 defined in this translation unit. As a further example, consider
2305 that when compiling a translation unit that uses PCH file with
2306 "-frepo" it would be incorrect to make decisions about what
2307 entities to emit when building the PCH; those decisions must be
2308 delayed until the repository information has been processed. */
2309 gcc_assert (at_eof);
2310 /* Object file linkage for explicit instantiations is handled in
2311 mark_decl_instantiated. For static variables in functions with
2312 vague linkage, maybe_commonize_var is used.
2314 Therefore, the only declarations that should be provided to this
2315 function are those with external linkage that are:
2317 * implicit instantiations of function templates
2321 * implicit instantiations of static data members of class
2328 Furthermore, all entities that reach this point must have a
2329 definition available in this translation unit.
2331 The following assertions check these conditions. */
2332 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2333 || TREE_CODE (decl) == VAR_DECL);
2334 /* Any code that creates entities with TREE_PUBLIC cleared should
2335 also set DECL_INTERFACE_KNOWN. */
2336 gcc_assert (TREE_PUBLIC (decl));
2337 if (TREE_CODE (decl) == FUNCTION_DECL)
2338 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2339 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2340 || DECL_DECLARED_INLINE_P (decl));
2342 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2343 || DECL_VTABLE_OR_VTT_P (decl)
2344 || DECL_TINFO_P (decl));
2345 /* Check that a definition of DECL is available in this translation
2347 gcc_assert (!DECL_REALLY_EXTERN (decl));
2349 /* Assume that DECL will not have COMDAT linkage. */
2351 /* Assume that DECL will not be imported into this translation
2355 /* See if the repository tells us whether or not to emit DECL in
2356 this translation unit. */
2357 emit_p = repo_emit_p (decl);
2360 else if (emit_p == 1)
2362 /* The repository indicates that this entity should be defined
2363 here. Make sure the back end honors that request. */
2364 if (TREE_CODE (decl) == VAR_DECL)
2366 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2367 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2370 FOR_EACH_CLONE (clone, decl)
2371 mark_needed (clone);
2375 /* Output the definition as an ordinary strong definition. */
2376 DECL_EXTERNAL (decl) = 0;
2377 DECL_INTERFACE_KNOWN (decl) = 1;
2382 /* We have already decided what to do with this DECL; there is no
2383 need to check anything further. */
2385 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2387 class_type = DECL_CONTEXT (decl);
2388 import_export_class (class_type);
2389 if (TYPE_FOR_JAVA (class_type))
2391 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2392 && CLASSTYPE_INTERFACE_ONLY (class_type))
2394 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2395 && !CLASSTYPE_USE_TEMPLATE (class_type)
2396 && CLASSTYPE_KEY_METHOD (class_type)
2397 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2398 /* The ABI requires that all virtual tables be emitted with
2399 COMDAT linkage. However, on systems where COMDAT symbols
2400 don't show up in the table of contents for a static
2401 archive, or on systems without weak symbols (where we
2402 approximate COMDAT linkage by using internal linkage), the
2403 linker will report errors about undefined symbols because
2404 it will not see the virtual table definition. Therefore,
2405 in the case that we know that the virtual table will be
2406 emitted in only one translation unit, we make the virtual
2407 table an ordinary definition with external linkage. */
2408 DECL_EXTERNAL (decl) = 0;
2409 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2411 /* CLASS_TYPE is being exported from this translation unit,
2412 so DECL should be defined here. */
2413 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2414 /* If a class is declared in a header with the "extern
2415 template" extension, then it will not be instantiated,
2416 even in translation units that would normally require
2417 it. Often such classes are explicitly instantiated in
2418 one translation unit. Therefore, the explicit
2419 instantiation must be made visible to other translation
2421 DECL_EXTERNAL (decl) = 0;
2424 /* The generic C++ ABI says that class data is always
2425 COMDAT, even if there is a key function. Some
2426 variants (e.g., the ARM EABI) says that class data
2427 only has COMDAT linkage if the class data might be
2428 emitted in more than one translation unit. When the
2429 key method can be inline and is inline, we still have
2430 to arrange for comdat even though
2431 class_data_always_comdat is false. */
2432 if (!CLASSTYPE_KEY_METHOD (class_type)
2433 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2434 || targetm.cxx.class_data_always_comdat ())
2436 /* The ABI requires COMDAT linkage. Normally, we
2437 only emit COMDAT things when they are needed;
2438 make sure that we realize that this entity is
2445 else if (!flag_implicit_templates
2446 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2451 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2453 tree type = TREE_TYPE (DECL_NAME (decl));
2454 if (CLASS_TYPE_P (type))
2457 import_export_class (type);
2458 if (CLASSTYPE_INTERFACE_KNOWN (type)
2459 && TYPE_POLYMORPHIC_P (type)
2460 && CLASSTYPE_INTERFACE_ONLY (type)
2461 /* If -fno-rtti was specified, then we cannot be sure
2462 that RTTI information will be emitted with the
2463 virtual table of the class, so we must emit it
2464 wherever it is used. */
2469 if (CLASSTYPE_INTERFACE_KNOWN (type)
2470 && !CLASSTYPE_INTERFACE_ONLY (type))
2472 comdat_p = (targetm.cxx.class_data_always_comdat ()
2473 || (CLASSTYPE_KEY_METHOD (type)
2474 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2479 DECL_EXTERNAL (decl) = 0;
2489 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2490 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2492 /* DECL is an implicit instantiation of a function or static
2494 if ((flag_implicit_templates
2495 && !flag_use_repository)
2496 || (flag_implicit_inline_templates
2497 && TREE_CODE (decl) == FUNCTION_DECL
2498 && DECL_DECLARED_INLINE_P (decl)))
2501 /* If we are not implicitly generating templates, then mark
2502 this entity as undefined in this translation unit. */
2505 else if (DECL_FUNCTION_MEMBER_P (decl))
2507 if (!DECL_DECLARED_INLINE_P (decl))
2509 tree ctype = DECL_CONTEXT (decl);
2510 import_export_class (ctype);
2511 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2513 DECL_NOT_REALLY_EXTERN (decl)
2514 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2515 || (DECL_DECLARED_INLINE_P (decl)
2516 && ! flag_implement_inlines
2517 && !DECL_VINDEX (decl)));
2519 if (!DECL_NOT_REALLY_EXTERN (decl))
2520 DECL_EXTERNAL (decl) = 1;
2522 /* Always make artificials weak. */
2523 if (DECL_ARTIFICIAL (decl) && flag_weak)
2526 maybe_make_one_only (decl);
2537 /* If we are importing DECL into this translation unit, mark is
2538 an undefined here. */
2539 DECL_EXTERNAL (decl) = 1;
2540 DECL_NOT_REALLY_EXTERN (decl) = 0;
2544 /* If we decided to put DECL in COMDAT, mark it accordingly at
2546 comdat_linkage (decl);
2549 DECL_INTERFACE_KNOWN (decl) = 1;
2552 /* Return an expression that performs the destruction of DECL, which
2553 must be a VAR_DECL whose type has a non-trivial destructor, or is
2554 an array whose (innermost) elements have a non-trivial destructor. */
2557 build_cleanup (tree decl)
2560 tree type = TREE_TYPE (decl);
2562 /* This function should only be called for declarations that really
2563 require cleanups. */
2564 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2566 /* Treat all objects with destructors as used; the destructor may do
2567 something substantive. */
2570 if (TREE_CODE (type) == ARRAY_TYPE)
2573 temp = build_address (decl);
2574 temp = build_delete (TREE_TYPE (temp), temp,
2575 sfk_complete_destructor,
2576 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2580 /* Returns the initialization guard variable for the variable DECL,
2581 which has static storage duration. */
2584 get_guard (tree decl)
2589 sname = mangle_guard_variable (decl);
2590 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2595 /* We use a type that is big enough to contain a mutex as well
2596 as an integer counter. */
2597 guard_type = targetm.cxx.guard_type ();
2598 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2599 VAR_DECL, sname, guard_type);
2601 /* The guard should have the same linkage as what it guards. */
2602 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2603 TREE_STATIC (guard) = TREE_STATIC (decl);
2604 DECL_COMMON (guard) = DECL_COMMON (decl);
2605 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2606 if (DECL_ONE_ONLY (decl))
2607 make_decl_one_only (guard, cxx_comdat_group (guard));
2608 if (TREE_PUBLIC (decl))
2609 DECL_WEAK (guard) = DECL_WEAK (decl);
2610 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2611 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2613 DECL_ARTIFICIAL (guard) = 1;
2614 DECL_IGNORED_P (guard) = 1;
2615 TREE_USED (guard) = 1;
2616 pushdecl_top_level_and_finish (guard, NULL_TREE);
2621 /* Return those bits of the GUARD variable that should be set when the
2622 guarded entity is actually initialized. */
2625 get_guard_bits (tree guard)
2627 if (!targetm.cxx.guard_mask_bit ())
2629 /* We only set the first byte of the guard, in order to leave room
2630 for a mutex in the high-order bits. */
2631 guard = build1 (ADDR_EXPR,
2632 build_pointer_type (TREE_TYPE (guard)),
2634 guard = build1 (NOP_EXPR,
2635 build_pointer_type (char_type_node),
2637 guard = build1 (INDIRECT_REF, char_type_node, guard);
2643 /* Return an expression which determines whether or not the GUARD
2644 variable has already been initialized. */
2647 get_guard_cond (tree guard)
2651 /* Check to see if the GUARD is zero. */
2652 guard = get_guard_bits (guard);
2654 /* Mask off all but the low bit. */
2655 if (targetm.cxx.guard_mask_bit ())
2657 guard_value = integer_one_node;
2658 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2659 guard_value = convert (TREE_TYPE (guard), guard_value);
2660 guard = cp_build_binary_op (input_location,
2661 BIT_AND_EXPR, guard, guard_value,
2662 tf_warning_or_error);
2665 guard_value = integer_zero_node;
2666 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2667 guard_value = convert (TREE_TYPE (guard), guard_value);
2668 return cp_build_binary_op (input_location,
2669 EQ_EXPR, guard, guard_value,
2670 tf_warning_or_error);
2673 /* Return an expression which sets the GUARD variable, indicating that
2674 the variable being guarded has been initialized. */
2677 set_guard (tree guard)
2681 /* Set the GUARD to one. */
2682 guard = get_guard_bits (guard);
2683 guard_init = integer_one_node;
2684 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2685 guard_init = convert (TREE_TYPE (guard), guard_init);
2686 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2687 tf_warning_or_error);
2690 /* Start the process of running a particular set of global constructors
2691 or destructors. Subroutine of do_[cd]tors. */
2694 start_objects (int method_type, int initp)
2700 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2702 if (initp != DEFAULT_INIT_PRIORITY)
2712 sprintf (type, "sub_%c%c%.5u", method_type, joiner, initp);
2715 sprintf (type, "sub_%c", method_type);
2717 fndecl = build_lang_decl (FUNCTION_DECL,
2718 get_file_function_name (type),
2719 build_function_type_list (void_type_node,
2721 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2723 TREE_PUBLIC (current_function_decl) = 0;
2725 /* Mark as artificial because it's not explicitly in the user's
2727 DECL_ARTIFICIAL (current_function_decl) = 1;
2729 /* Mark this declaration as used to avoid spurious warnings. */
2730 TREE_USED (current_function_decl) = 1;
2732 /* Mark this function as a global constructor or destructor. */
2733 if (method_type == 'I')
2734 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2736 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2738 body = begin_compound_stmt (BCS_FN_BODY);
2743 /* Finish the process of running a particular set of global constructors
2744 or destructors. Subroutine of do_[cd]tors. */
2747 finish_objects (int method_type, int initp, tree body)
2752 finish_compound_stmt (body);
2753 fn = finish_function (0);
2755 if (method_type == 'I')
2757 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2758 decl_init_priority_insert (fn, initp);
2762 DECL_STATIC_DESTRUCTOR (fn) = 1;
2763 decl_fini_priority_insert (fn, initp);
2766 expand_or_defer_fn (fn);
2769 /* The names of the parameters to the function created to handle
2770 initializations and destructions for objects with static storage
2772 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2773 #define PRIORITY_IDENTIFIER "__priority"
2775 /* The name of the function we create to handle initializations and
2776 destructions for objects with static storage duration. */
2777 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2779 /* The declaration for the __INITIALIZE_P argument. */
2780 static GTY(()) tree initialize_p_decl;
2782 /* The declaration for the __PRIORITY argument. */
2783 static GTY(()) tree priority_decl;
2785 /* The declaration for the static storage duration function. */
2786 static GTY(()) tree ssdf_decl;
2788 /* All the static storage duration functions created in this
2789 translation unit. */
2790 static GTY(()) VEC(tree,gc) *ssdf_decls;
2792 /* A map from priority levels to information about that priority
2793 level. There may be many such levels, so efficient lookup is
2795 static splay_tree priority_info_map;
2797 /* Begins the generation of the function that will handle all
2798 initialization and destruction of objects with static storage
2799 duration. The function generated takes two parameters of type
2800 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2801 nonzero, it performs initializations. Otherwise, it performs
2802 destructions. It only performs those initializations or
2803 destructions with the indicated __PRIORITY. The generated function
2806 It is assumed that this function will only be called once per
2807 translation unit. */
2810 start_static_storage_duration_function (unsigned count)
2814 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2816 /* Create the identifier for this function. It will be of the form
2817 SSDF_IDENTIFIER_<number>. */
2818 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2820 type = build_function_type_list (void_type_node,
2821 integer_type_node, integer_type_node,
2824 /* Create the FUNCTION_DECL itself. */
2825 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2826 get_identifier (id),
2828 TREE_PUBLIC (ssdf_decl) = 0;
2829 DECL_ARTIFICIAL (ssdf_decl) = 1;
2831 /* Put this function in the list of functions to be called from the
2832 static constructors and destructors. */
2835 ssdf_decls = VEC_alloc (tree, gc, 32);
2837 /* Take this opportunity to initialize the map from priority
2838 numbers to information about that priority level. */
2839 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2840 /*delete_key_fn=*/0,
2841 /*delete_value_fn=*/
2842 (splay_tree_delete_value_fn) &free);
2844 /* We always need to generate functions for the
2845 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2846 priorities later, we'll be sure to find the
2847 DEFAULT_INIT_PRIORITY. */
2848 get_priority_info (DEFAULT_INIT_PRIORITY);
2851 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2853 /* Create the argument list. */
2854 initialize_p_decl = cp_build_parm_decl
2855 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2856 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2857 TREE_USED (initialize_p_decl) = 1;
2858 priority_decl = cp_build_parm_decl
2859 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2860 DECL_CONTEXT (priority_decl) = ssdf_decl;
2861 TREE_USED (priority_decl) = 1;
2863 DECL_CHAIN (initialize_p_decl) = priority_decl;
2864 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2866 /* Put the function in the global scope. */
2867 pushdecl (ssdf_decl);
2869 /* Start the function itself. This is equivalent to declaring the
2872 static void __ssdf (int __initialize_p, init __priority_p);
2874 It is static because we only need to call this function from the
2875 various constructor and destructor functions for this module. */
2876 start_preparsed_function (ssdf_decl,
2877 /*attrs=*/NULL_TREE,
2880 /* Set up the scope of the outermost block in the function. */
2881 body = begin_compound_stmt (BCS_FN_BODY);
2886 /* Finish the generation of the function which performs initialization
2887 and destruction of objects with static storage duration. After
2888 this point, no more such objects can be created. */
2891 finish_static_storage_duration_function (tree body)
2893 /* Close out the function. */
2894 finish_compound_stmt (body);
2895 expand_or_defer_fn (finish_function (0));
2898 /* Return the information about the indicated PRIORITY level. If no
2899 code to handle this level has yet been generated, generate the
2900 appropriate prologue. */
2902 static priority_info
2903 get_priority_info (int priority)
2908 n = splay_tree_lookup (priority_info_map,
2909 (splay_tree_key) priority);
2912 /* Create a new priority information structure, and insert it
2914 pi = XNEW (struct priority_info_s);
2915 pi->initializations_p = 0;
2916 pi->destructions_p = 0;
2917 splay_tree_insert (priority_info_map,
2918 (splay_tree_key) priority,
2919 (splay_tree_value) pi);
2922 pi = (priority_info) n->value;
2927 /* The effective initialization priority of a DECL. */
2929 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2930 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2931 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2933 /* Whether a DECL needs a guard to protect it against multiple
2936 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2937 || DECL_ONE_ONLY (decl) \
2938 || DECL_WEAK (decl)))
2940 /* Called from one_static_initialization_or_destruction(),
2942 Walks the initializer list of a global variable and looks for
2943 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2944 and that have their DECL_CONTEXT() == NULL.
2945 For each such temporary variable, set their DECL_CONTEXT() to
2946 the current function. This is necessary because otherwise
2947 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2948 when trying to refer to a temporary variable that does not have
2949 it's DECL_CONTECT() properly set. */
2951 fix_temporary_vars_context_r (tree *node,
2952 int *unused ATTRIBUTE_UNUSED,
2953 void *unused1 ATTRIBUTE_UNUSED)
2955 gcc_assert (current_function_decl);
2957 if (TREE_CODE (*node) == BIND_EXPR)
2961 for (var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var))
2962 if (TREE_CODE (var) == VAR_DECL
2964 && DECL_ARTIFICIAL (var)
2965 && !DECL_CONTEXT (var))
2966 DECL_CONTEXT (var) = current_function_decl;
2972 /* Set up to handle the initialization or destruction of DECL. If
2973 INITP is nonzero, we are initializing the variable. Otherwise, we
2974 are destroying it. */
2977 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2979 tree guard_if_stmt = NULL_TREE;
2982 /* If we are supposed to destruct and there's a trivial destructor,
2983 nothing has to be done. */
2985 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2988 /* Trick the compiler into thinking we are at the file and line
2989 where DECL was declared so that error-messages make sense, and so
2990 that the debugger will show somewhat sensible file and line
2992 input_location = DECL_SOURCE_LOCATION (decl);
2994 /* Make sure temporary variables in the initialiser all have
2995 their DECL_CONTEXT() set to a value different from NULL_TREE.
2996 This can happen when global variables initialisers are built.
2997 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2998 the temporary variables that might have been generated in the
2999 accompagning initialisers is NULL_TREE, meaning the variables have been
3000 declared in the global namespace.
3001 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3002 of the temporaries are set to the current function decl. */
3003 cp_walk_tree_without_duplicates (&init,
3004 fix_temporary_vars_context_r,
3011 Access control for implicit calls to the constructors,
3012 the conversion functions, or the destructor called to
3013 create and destroy a static data member is performed as
3014 if these calls appeared in the scope of the member's
3017 we pretend we are in a static member function of the class of
3018 which the DECL is a member. */
3019 if (member_p (decl))
3021 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3022 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3025 /* Assume we don't need a guard. */
3027 /* We need a guard if this is an object with external linkage that
3028 might be initialized in more than one place. (For example, a
3029 static data member of a template, when the data member requires
3031 if (NEEDS_GUARD_P (decl))
3035 guard = get_guard (decl);
3037 /* When using __cxa_atexit, we just check the GUARD as we would
3038 for a local static. */
3039 if (flag_use_cxa_atexit)
3041 /* When using __cxa_atexit, we never try to destroy
3042 anything from a static destructor. */
3044 guard_cond = get_guard_cond (guard);
3046 /* If we don't have __cxa_atexit, then we will be running
3047 destructors from .fini sections, or their equivalents. So,
3048 we need to know how many times we've tried to initialize this
3049 object. We do initializations only if the GUARD is zero,
3050 i.e., if we are the first to initialize the variable. We do
3051 destructions only if the GUARD is one, i.e., if we are the
3052 last to destroy the variable. */
3055 = cp_build_binary_op (input_location,
3057 cp_build_unary_op (PREINCREMENT_EXPR,
3060 tf_warning_or_error),
3062 tf_warning_or_error);
3065 = cp_build_binary_op (input_location,
3067 cp_build_unary_op (PREDECREMENT_EXPR,
3070 tf_warning_or_error),
3072 tf_warning_or_error);
3074 guard_if_stmt = begin_if_stmt ();
3075 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3079 /* If we're using __cxa_atexit, we have not already set the GUARD,
3080 so we must do so now. */
3081 if (guard && initp && flag_use_cxa_atexit)
3082 finish_expr_stmt (set_guard (guard));
3084 /* Perform the initialization or destruction. */
3088 finish_expr_stmt (init);
3090 /* If we're using __cxa_atexit, register a function that calls the
3091 destructor for the object. */
3092 if (flag_use_cxa_atexit)
3093 finish_expr_stmt (register_dtor_fn (decl));
3096 finish_expr_stmt (build_cleanup (decl));
3098 /* Finish the guard if-stmt, if necessary. */
3101 finish_then_clause (guard_if_stmt);
3102 finish_if_stmt (guard_if_stmt);
3105 /* Now that we're done with DECL we don't need to pretend to be a
3106 member of its class any longer. */
3107 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3108 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3111 /* Generate code to do the initialization or destruction of the decls in VARS,
3112 a TREE_LIST of VAR_DECL with static storage duration.
3113 Whether initialization or destruction is performed is specified by INITP. */
3116 do_static_initialization_or_destruction (tree vars, bool initp)
3118 tree node, init_if_stmt, cond;
3120 /* Build the outer if-stmt to check for initialization or destruction. */
3121 init_if_stmt = begin_if_stmt ();
3122 cond = initp ? integer_one_node : integer_zero_node;
3123 cond = cp_build_binary_op (input_location,
3127 tf_warning_or_error);
3128 finish_if_stmt_cond (cond, init_if_stmt);
3132 tree decl = TREE_VALUE (node);
3133 tree priority_if_stmt;
3137 /* If we don't need a destructor, there's nothing to do. Avoid
3138 creating a possibly empty if-stmt. */
3139 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3141 node = TREE_CHAIN (node);
3145 /* Remember that we had an initialization or finalization at this
3147 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3148 pi = get_priority_info (priority);
3150 pi->initializations_p = 1;
3152 pi->destructions_p = 1;
3154 /* Conditionalize this initialization on being in the right priority
3155 and being initializing/finalizing appropriately. */
3156 priority_if_stmt = begin_if_stmt ();
3157 cond = cp_build_binary_op (input_location,
3160 build_int_cst (NULL_TREE, priority),
3161 tf_warning_or_error);
3162 finish_if_stmt_cond (cond, priority_if_stmt);
3164 /* Process initializers with same priority. */
3166 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3167 node = TREE_CHAIN (node))
3168 /* Do one initialization or destruction. */
3169 one_static_initialization_or_destruction (TREE_VALUE (node),
3170 TREE_PURPOSE (node), initp);
3172 /* Finish up the priority if-stmt body. */
3173 finish_then_clause (priority_if_stmt);
3174 finish_if_stmt (priority_if_stmt);
3178 /* Finish up the init/destruct if-stmt body. */
3179 finish_then_clause (init_if_stmt);
3180 finish_if_stmt (init_if_stmt);
3183 /* VARS is a list of variables with static storage duration which may
3184 need initialization and/or finalization. Remove those variables
3185 that don't really need to be initialized or finalized, and return
3186 the resulting list. The order in which the variables appear in
3187 VARS is in reverse order of the order in which they should actually
3188 be initialized. The list we return is in the unreversed order;
3189 i.e., the first variable should be initialized first. */
3192 prune_vars_needing_no_initialization (tree *vars)
3195 tree result = NULL_TREE;
3200 tree decl = TREE_VALUE (t);
3201 tree init = TREE_PURPOSE (t);
3203 /* Deal gracefully with error. */
3204 if (decl == error_mark_node)
3206 var = &TREE_CHAIN (t);
3210 /* The only things that can be initialized are variables. */
3211 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3213 /* If this object is not defined, we don't need to do anything
3215 if (DECL_EXTERNAL (decl))
3217 var = &TREE_CHAIN (t);
3221 /* Also, if the initializer already contains errors, we can bail
3223 if (init && TREE_CODE (init) == TREE_LIST
3224 && value_member (error_mark_node, init))
3226 var = &TREE_CHAIN (t);
3230 /* This variable is going to need initialization and/or
3231 finalization, so we add it to the list. */
3232 *var = TREE_CHAIN (t);
3233 TREE_CHAIN (t) = result;
3240 /* Make sure we have told the back end about all the variables in
3244 write_out_vars (tree vars)
3248 for (v = vars; v; v = TREE_CHAIN (v))
3250 tree var = TREE_VALUE (v);
3251 if (!var_finalized_p (var))
3253 import_export_decl (var);
3254 rest_of_decl_compilation (var, 1, 1);
3259 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3260 (otherwise) that will initialize all global objects with static
3261 storage duration having the indicated PRIORITY. */
3264 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3272 input_location = *locus;
3274 /* Was: locus->line++; */
3276 /* We use `I' to indicate initialization and `D' to indicate
3278 function_key = constructor_p ? 'I' : 'D';
3280 /* We emit the function lazily, to avoid generating empty
3281 global constructors and destructors. */
3284 /* For Objective-C++, we may need to initialize metadata found in this module.
3285 This must be done _before_ any other static initializations. */
3286 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3287 && constructor_p && objc_static_init_needed_p ())
3289 body = start_objects (function_key, priority);
3290 objc_generate_static_init_call (NULL_TREE);
3293 /* Call the static storage duration function with appropriate
3295 FOR_EACH_VEC_ELT (tree, ssdf_decls, i, fndecl)
3297 /* Calls to pure or const functions will expand to nothing. */
3298 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3303 body = start_objects (function_key, priority);
3305 call = cp_build_function_call_nary (fndecl, tf_warning_or_error,
3306 build_int_cst (NULL_TREE,
3308 build_int_cst (NULL_TREE,
3311 finish_expr_stmt (call);
3315 /* Close out the function. */
3317 finish_objects (function_key, priority, body);
3320 /* Generate constructor and destructor functions for the priority
3324 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3326 location_t *locus = (location_t *) data;
3327 int priority = (int) n->key;
3328 priority_info pi = (priority_info) n->value;
3330 /* Generate the functions themselves, but only if they are really
3332 if (pi->initializations_p)
3333 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3334 if (pi->destructions_p)
3335 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3337 /* Keep iterating. */
3341 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3342 decls referenced from front-end specific constructs; it will be called
3343 only for language-specific tree nodes.
3345 Here we must deal with member pointers. */
3348 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3352 switch (TREE_CODE (t))
3355 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3356 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3359 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3360 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3363 if (DECL_CONTEXT (t)
3364 && flag_use_repository
3365 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3366 /* If we need a static variable in a function, then we
3367 need the containing function. */
3368 mark_decl_referenced (DECL_CONTEXT (t));
3377 /* Java requires that we be able to reference a local address for a
3378 method, and not be confused by PLT entries. If hidden aliases are
3379 supported, collect and return all the functions for which we should
3380 emit a hidden alias. */
3382 static struct pointer_set_t *
3383 collect_candidates_for_java_method_aliases (void)
3385 struct cgraph_node *node;
3386 struct pointer_set_t *candidates = NULL;
3388 #ifndef HAVE_GAS_HIDDEN
3392 for (node = cgraph_nodes; node ; node = node->next)
3394 tree fndecl = node->decl;
3396 if (DECL_CONTEXT (fndecl)
3397 && TYPE_P (DECL_CONTEXT (fndecl))
3398 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3399 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3401 if (candidates == NULL)
3402 candidates = pointer_set_create ();
3403 pointer_set_insert (candidates, fndecl);
3411 /* Java requires that we be able to reference a local address for a
3412 method, and not be confused by PLT entries. If hidden aliases are
3413 supported, emit one for each java function that we've emitted.
3414 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3415 by collect_candidates_for_java_method_aliases. */
3418 build_java_method_aliases (struct pointer_set_t *candidates)
3420 struct cgraph_node *node;
3422 #ifndef HAVE_GAS_HIDDEN
3426 for (node = cgraph_nodes; node ; node = node->next)
3428 tree fndecl = node->decl;
3430 if (TREE_ASM_WRITTEN (fndecl)
3431 && pointer_set_contains (candidates, fndecl))
3433 /* Mangle the name in a predictable way; we need to reference
3434 this from a java compiled object file. */
3435 tree oid, nid, alias;
3439 oid = DECL_ASSEMBLER_NAME (fndecl);
3440 oname = IDENTIFIER_POINTER (oid);
3441 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3442 nname = ACONCAT (("_ZGA", oname+2, NULL));
3443 nid = get_identifier (nname);
3445 alias = make_alias_for (fndecl, nid);
3446 TREE_PUBLIC (alias) = 1;
3447 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3449 assemble_alias (alias, oid);
3454 /* Return C++ property of T, based on given operation OP. */
3457 cpp_check (tree t, cpp_operation op)
3462 return DECL_PURE_VIRTUAL_P (t);
3463 case IS_CONSTRUCTOR:
3464 return DECL_CONSTRUCTOR_P (t);
3466 return DECL_DESTRUCTOR_P (t);
3467 case IS_COPY_CONSTRUCTOR:
3468 return DECL_COPY_CONSTRUCTOR_P (t);
3470 return TREE_CODE (t) == TEMPLATE_DECL;
3476 /* Collect source file references recursively, starting from NAMESPC. */
3479 collect_source_refs (tree namespc)
3486 /* Iterate over names in this name space. */
3487 for (t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
3488 if (!DECL_IS_BUILTIN (t) )
3489 collect_source_ref (DECL_SOURCE_FILE (t));
3491 /* Dump siblings, if any */
3492 collect_source_refs (TREE_CHAIN (namespc));
3494 /* Dump children, if any */
3495 collect_source_refs (NAMESPACE_LEVEL (namespc)->namespaces);
3498 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
3499 starting from NAMESPC. */
3502 collect_ada_namespace (tree namespc, const char *source_file)
3507 /* Collect decls from this namespace */
3508 collect_ada_nodes (NAMESPACE_LEVEL (namespc)->names, source_file);
3510 /* Collect siblings, if any */
3511 collect_ada_namespace (TREE_CHAIN (namespc), source_file);
3513 /* Collect children, if any */
3514 collect_ada_namespace (NAMESPACE_LEVEL (namespc)->namespaces, source_file);
3517 /* Returns true iff there is a definition available for variable or
3521 decl_defined_p (tree decl)
3523 if (TREE_CODE (decl) == FUNCTION_DECL)
3524 return (DECL_INITIAL (decl) != NULL_TREE);
3527 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3528 return !DECL_EXTERNAL (decl);
3532 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
3536 An integral constant-expression can only involve ... const
3537 variables of integral or enumeration types initialized with
3538 constant expressions ...
3540 C++0x also allows constexpr variables and temporaries initialized
3541 with constant expressions. We handle the former here, but the latter
3542 are just folded away in cxx_eval_constant_expression.
3544 The standard does not require that the expression be non-volatile.
3545 G++ implements the proposed correction in DR 457. */
3548 decl_constant_var_p (tree decl)
3551 tree type = TREE_TYPE (decl);
3552 if (TREE_CODE (decl) != VAR_DECL)
3554 if (DECL_DECLARED_CONSTEXPR_P (decl)
3555 || (CP_TYPE_CONST_NON_VOLATILE_P (type)
3556 && INTEGRAL_OR_ENUMERATION_TYPE_P (type)))
3558 /* We don't know if a template static data member is initialized with
3559 a constant expression until we instantiate its initializer. Even
3560 in the case of a constexpr variable, we can't treat it as a
3561 constant until its initializer is complete in case it's used in
3562 its own initializer. */
3564 ret = DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl);
3572 /* Returns true if DECL could be a symbolic constant variable, depending on
3576 decl_maybe_constant_var_p (tree decl)
3578 tree type = TREE_TYPE (decl);
3579 if (TREE_CODE (decl) != VAR_DECL)
3581 if (DECL_DECLARED_CONSTEXPR_P (decl))
3583 return (CP_TYPE_CONST_NON_VOLATILE_P (type)
3584 && INTEGRAL_OR_ENUMERATION_TYPE_P (type));
3587 /* Complain that DECL uses a type with no linkage but is never defined. */
3590 no_linkage_error (tree decl)
3592 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3593 if (TYPE_ANONYMOUS_P (t))
3595 permerror (0, "%q+#D, declared using anonymous type, "
3596 "is used but never defined", decl);
3597 if (is_typedef_decl (TYPE_NAME (t)))
3598 permerror (0, "%q+#D does not refer to the unqualified type, "
3599 "so it is not used for linkage", TYPE_NAME (t));
3602 permerror (0, "%q+#D, declared using local type %qT, "
3603 "is used but never defined", decl, t);
3606 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
3609 collect_all_refs (const char *source_file)
3611 collect_ada_namespace (global_namespace, source_file);
3614 /* This routine is called at the end of compilation.
3615 Its job is to create all the code needed to initialize and
3616 destroy the global aggregates. We do the destruction
3617 first, since that way we only need to reverse the decls once. */
3620 cp_write_global_declarations (void)
3626 unsigned ssdf_count = 0;
3629 struct pointer_set_t *candidates;
3631 locus = input_location;
3634 /* Bad parse errors. Just forget about it. */
3635 if (! global_bindings_p () || current_class_type
3636 || !VEC_empty (tree,decl_namespace_list))
3640 c_common_write_pch ();
3642 /* Handle -fdump-ada-spec[-slim] */
3643 if (dump_enabled_p (TDI_ada))
3645 if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM)
3646 collect_source_ref (main_input_filename);
3648 collect_source_refs (global_namespace);
3650 dump_ada_specs (collect_all_refs, cpp_check);
3653 /* FIXME - huh? was input_line -= 1;*/
3655 /* We now have to write out all the stuff we put off writing out.
3658 o Template specializations that we have not yet instantiated,
3659 but which are needed.
3660 o Initialization and destruction for non-local objects with
3661 static storage duration. (Local objects with static storage
3662 duration are initialized when their scope is first entered,
3663 and are cleaned up via atexit.)
3664 o Virtual function tables.
3666 All of these may cause others to be needed. For example,
3667 instantiating one function may cause another to be needed, and
3668 generating the initializer for an object may cause templates to be
3669 instantiated, etc., etc. */
3671 timevar_push (TV_VARCONST);
3673 emit_support_tinfos ();
3682 /* If there are templates that we've put off instantiating, do
3684 instantiate_pending_templates (retries);
3687 /* Write out virtual tables as required. Note that writing out
3688 the virtual table for a template class may cause the
3689 instantiation of members of that class. If we write out
3690 vtables then we remove the class from our list so we don't
3691 have to look at it again. */
3693 while (keyed_classes != NULL_TREE
3694 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3697 keyed_classes = TREE_CHAIN (keyed_classes);
3703 tree next = TREE_CHAIN (t);
3707 if (maybe_emit_vtables (TREE_VALUE (next)))
3710 TREE_CHAIN (t) = TREE_CHAIN (next);
3715 next = TREE_CHAIN (t);
3719 /* Write out needed type info variables. We have to be careful
3720 looping through unemitted decls, because emit_tinfo_decl may
3721 cause other variables to be needed. New elements will be
3722 appended, and we remove from the vector those that actually
3724 for (i = VEC_length (tree, unemitted_tinfo_decls);
3725 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3726 if (emit_tinfo_decl (t))
3729 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3732 /* The list of objects with static storage duration is built up
3733 in reverse order. We clear STATIC_AGGREGATES so that any new
3734 aggregates added during the initialization of these will be
3735 initialized in the correct order when we next come around the
3737 vars = prune_vars_needing_no_initialization (&static_aggregates);
3741 /* We need to start a new initialization function each time
3742 through the loop. That's because we need to know which
3743 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3744 isn't computed until a function is finished, and written
3745 out. That's a deficiency in the back end. When this is
3746 fixed, these initialization functions could all become
3747 inline, with resulting performance improvements. */
3750 /* Set the line and file, so that it is obviously not from
3752 input_location = locus;
3753 ssdf_body = start_static_storage_duration_function (ssdf_count);
3755 /* Make sure the back end knows about all the variables. */
3756 write_out_vars (vars);
3758 /* First generate code to do all the initializations. */
3760 do_static_initialization_or_destruction (vars, /*initp=*/true);
3762 /* Then, generate code to do all the destructions. Do these
3763 in reverse order so that the most recently constructed
3764 variable is the first destroyed. If we're using
3765 __cxa_atexit, then we don't need to do this; functions
3766 were registered at initialization time to destroy the
3768 if (!flag_use_cxa_atexit && vars)
3770 vars = nreverse (vars);
3771 do_static_initialization_or_destruction (vars, /*initp=*/false);
3776 /* Finish up the static storage duration function for this
3778 input_location = locus;
3779 finish_static_storage_duration_function (ssdf_body);
3781 /* All those initializations and finalizations might cause
3782 us to need more inline functions, more template
3783 instantiations, etc. */
3786 /* ??? was: locus.line++; */
3789 /* Go through the set of inline functions whose bodies have not
3790 been emitted yet. If out-of-line copies of these functions
3791 are required, emit them. */
3792 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3794 /* Does it need synthesizing? */
3795 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3796 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3798 /* Even though we're already at the top-level, we push
3799 there again. That way, when we pop back a few lines
3800 hence, all of our state is restored. Otherwise,
3801 finish_function doesn't clean things up, and we end
3802 up with CURRENT_FUNCTION_DECL set. */
3803 push_to_top_level ();
3804 /* The decl's location will mark where it was first
3805 needed. Save that so synthesize method can indicate
3806 where it was needed from, in case of error */
3807 input_location = DECL_SOURCE_LOCATION (decl);
3808 synthesize_method (decl);
3809 pop_from_top_level ();
3813 if (!DECL_SAVED_TREE (decl))
3816 /* We lie to the back end, pretending that some functions
3817 are not defined when they really are. This keeps these
3818 functions from being put out unnecessarily. But, we must
3819 stop lying when the functions are referenced, or if they
3820 are not comdat since they need to be put out now. If
3821 DECL_INTERFACE_KNOWN, then we have already set
3822 DECL_EXTERNAL appropriately, so there's no need to check
3823 again, and we do not want to clear DECL_EXTERNAL if a
3824 previous call to import_export_decl set it.
3826 This is done in a separate for cycle, because if some
3827 deferred function is contained in another deferred
3828 function later in deferred_fns varray,
3829 rest_of_compilation would skip this function and we
3830 really cannot expand the same function twice. */
3831 import_export_decl (decl);
3832 if (DECL_NOT_REALLY_EXTERN (decl)
3833 && DECL_INITIAL (decl)
3834 && decl_needed_p (decl))
3836 struct cgraph_node *node = cgraph_get_node (decl), *alias, *next;
3838 DECL_EXTERNAL (decl) = 0;
3839 /* If we mark !DECL_EXTERNAL one of the same body aliases,
3840 we need to mark all of them that way. */
3841 if (node && node->same_body)
3843 DECL_EXTERNAL (node->decl) = 0;
3844 for (alias = node->same_body; alias; alias = alias->next)
3845 DECL_EXTERNAL (alias->decl) = 0;
3847 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3848 group, we need to mark all symbols in the same comdat group
3850 if (node->same_comdat_group)
3851 for (next = node->same_comdat_group;
3853 next = next->same_comdat_group)
3855 DECL_EXTERNAL (next->decl) = 0;
3856 if (next->same_body)
3858 for (alias = next->same_body;
3860 alias = alias->next)
3861 DECL_EXTERNAL (alias->decl) = 0;
3866 /* If we're going to need to write this function out, and
3867 there's already a body for it, create RTL for it now.
3868 (There might be no body if this is a method we haven't
3869 gotten around to synthesizing yet.) */
3870 if (!DECL_EXTERNAL (decl)
3871 && decl_needed_p (decl)
3872 && !TREE_ASM_WRITTEN (decl)
3873 && !cgraph_node (decl)->local.finalized)
3875 /* We will output the function; no longer consider it in this
3877 DECL_DEFER_OUTPUT (decl) = 0;
3878 /* Generate RTL for this function now that we know we
3880 expand_or_defer_fn (decl);
3881 /* If we're compiling -fsyntax-only pretend that this
3882 function has been written out so that we don't try to
3884 if (flag_syntax_only)
3885 TREE_ASM_WRITTEN (decl) = 1;
3890 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3893 /* Static data members are just like namespace-scope globals. */
3894 FOR_EACH_VEC_ELT (tree, pending_statics, i, decl)
3896 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3897 /* Don't write it out if we haven't seen a definition. */
3898 || DECL_IN_AGGR_P (decl))
3900 import_export_decl (decl);
3901 /* If this static data member is needed, provide it to the
3903 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3904 DECL_EXTERNAL (decl) = 0;
3906 if (VEC_length (tree, pending_statics) != 0
3907 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3908 VEC_length (tree, pending_statics)))
3915 /* All used inline functions must have a definition at this point. */
3916 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3918 if (/* Check online inline functions that were actually used. */
3919 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3920 /* If the definition actually was available here, then the
3921 fact that the function was not defined merely represents
3922 that for some reason (use of a template repository,
3923 #pragma interface, etc.) we decided not to emit the
3925 && !DECL_INITIAL (decl)
3926 /* An explicit instantiation can be used to specify
3927 that the body is in another unit. It will have
3928 already verified there was a definition. */
3929 && !DECL_EXPLICIT_INSTANTIATION (decl))
3931 warning (0, "inline function %q+D used but never defined", decl);
3932 /* Avoid a duplicate warning from check_global_declaration_1. */
3933 TREE_NO_WARNING (decl) = 1;
3937 /* So must decls that use a type with no linkage. */
3938 FOR_EACH_VEC_ELT (tree, no_linkage_decls, i, decl)
3939 if (!decl_defined_p (decl))
3940 no_linkage_error (decl);
3942 /* Then, do the Objective-C stuff. This is where all the
3943 Objective-C module stuff gets generated (symtab,
3944 class/protocol/selector lists etc). This must be done after C++
3945 templates, destructors etc. so that selectors used in C++
3946 templates are properly allocated. */
3947 if (c_dialect_objc ())
3948 objc_write_global_declarations ();
3950 /* We give C linkage to static constructors and destructors. */
3951 push_lang_context (lang_name_c);
3953 /* Generate initialization and destruction functions for all
3954 priorities for which they are required. */
3955 if (priority_info_map)
3956 splay_tree_foreach (priority_info_map,
3957 generate_ctor_and_dtor_functions_for_priority,
3959 else if (c_dialect_objc () && objc_static_init_needed_p ())
3960 /* If this is obj-c++ and we need a static init, call
3961 generate_ctor_or_dtor_function. */
3962 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3963 DEFAULT_INIT_PRIORITY, &locus);
3965 /* We're done with the splay-tree now. */
3966 if (priority_info_map)
3967 splay_tree_delete (priority_info_map);
3969 /* Generate any missing aliases. */
3970 maybe_apply_pending_pragma_weaks ();
3972 /* We're done with static constructors, so we can go back to "C++"
3974 pop_lang_context ();
3976 /* Collect candidates for Java hidden aliases. */
3977 candidates = collect_candidates_for_java_method_aliases ();
3979 cgraph_finalize_compilation_unit ();
3981 /* Now, issue warnings about static, but not defined, functions,
3982 etc., and emit debugging information. */
3983 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3984 if (VEC_length (tree, pending_statics) != 0)
3986 check_global_declarations (VEC_address (tree, pending_statics),
3987 VEC_length (tree, pending_statics));
3988 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3989 VEC_length (tree, pending_statics));
3992 perform_deferred_noexcept_checks ();
3994 /* Generate hidden aliases for Java. */
3997 build_java_method_aliases (candidates);
3998 pointer_set_destroy (candidates);
4003 /* The entire file is now complete. If requested, dump everything
4007 FILE *stream = dump_begin (TDI_tu, &flags);
4011 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
4012 dump_end (TDI_tu, stream);
4016 timevar_pop (TV_VARCONST);
4018 if (flag_detailed_statistics)
4020 dump_tree_statistics ();
4021 dump_time_statistics ();
4023 input_location = locus;
4025 #ifdef ENABLE_CHECKING
4026 validate_conversion_obstack ();
4027 #endif /* ENABLE_CHECKING */
4030 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4031 function to call in parse-tree form; it has not yet been
4032 semantically analyzed. ARGS are the arguments to the function.
4033 They have already been semantically analyzed. This may change
4037 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
4040 VEC(tree,gc) *orig_args = NULL;
4045 object = TREE_OPERAND (fn, 0);
4047 if (processing_template_decl)
4049 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
4050 || TREE_CODE (fn) == MEMBER_REF);
4051 if (type_dependent_expression_p (fn)
4052 || any_type_dependent_arguments_p (*args))
4053 return build_nt_call_vec (fn, *args);
4055 orig_args = make_tree_vector_copy (*args);
4057 /* Transform the arguments and add the implicit "this"
4058 parameter. That must be done before the FN is transformed
4059 because we depend on the form of FN. */
4060 make_args_non_dependent (*args);
4061 object = build_non_dependent_expr (object);
4062 if (TREE_CODE (fn) == DOTSTAR_EXPR)
4063 object = cp_build_addr_expr (object, tf_warning_or_error);
4064 VEC_safe_insert (tree, gc, *args, 0, object);
4065 /* Now that the arguments are done, transform FN. */
4066 fn = build_non_dependent_expr (fn);
4069 /* A qualified name corresponding to a bound pointer-to-member is
4070 represented as an OFFSET_REF:
4072 struct B { void g(); };
4074 void B::g() { (this->*p)(); } */
4075 if (TREE_CODE (fn) == OFFSET_REF)
4077 tree object_addr = cp_build_addr_expr (object, tf_warning_or_error);
4078 fn = TREE_OPERAND (fn, 1);
4079 fn = get_member_function_from_ptrfunc (&object_addr, fn);
4080 VEC_safe_insert (tree, gc, *args, 0, object_addr);
4083 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
4084 if (processing_template_decl && expr != error_mark_node)
4085 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
4087 if (orig_args != NULL)
4088 release_tree_vector (orig_args);
4095 check_default_args (tree x)
4097 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
4098 bool saw_def = false;
4099 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
4100 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
4102 if (TREE_PURPOSE (arg))
4106 error ("default argument missing for parameter %P of %q+#D", i, x);
4107 TREE_PURPOSE (arg) = error_mark_node;
4112 /* Return true if function DECL can be inlined. This is used to force
4113 instantiation of methods that might be interesting for inlining. */
4115 possibly_inlined_p (tree decl)
4117 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
4118 if (DECL_UNINLINABLE (decl))
4120 if (!optimize || pragma_java_exceptions)
4121 return DECL_DECLARED_INLINE_P (decl);
4122 /* When optimizing, we might inline everything when flatten
4123 attribute or heuristics inlining for size or autoinlining
4128 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4129 If DECL is a specialization or implicitly declared class member,
4130 generate the actual definition. */
4133 mark_used (tree decl)
4135 /* If DECL is a BASELINK for a single function, then treat it just
4136 like the DECL for the function. Otherwise, if the BASELINK is
4137 for an overloaded function, we don't know which function was
4138 actually used until after overload resolution. */
4139 if (TREE_CODE (decl) == BASELINK)
4141 decl = BASELINK_FUNCTIONS (decl);
4142 if (really_overloaded_fn (decl))
4144 decl = OVL_CURRENT (decl);
4147 /* Set TREE_USED for the benefit of -Wunused. */
4148 TREE_USED (decl) = 1;
4149 if (DECL_CLONED_FUNCTION_P (decl))
4150 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4152 if (TREE_CODE (decl) == FUNCTION_DECL
4153 && DECL_DELETED_FN (decl))
4155 if (DECL_ARTIFICIAL (decl))
4157 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
4158 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
4160 /* We mark a lambda conversion op as deleted if we can't
4161 generate it properly; see maybe_add_lambda_conv_op. */
4162 sorry ("converting lambda which uses %<...%> to "
4163 "function pointer");
4167 error ("use of deleted function %qD", decl);
4168 if (!maybe_explain_implicit_delete (decl))
4169 error_at (DECL_SOURCE_LOCATION (decl), "declared here");
4173 /* We can only check DECL_ODR_USED on variables or functions with
4174 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4175 might need special handling for. */
4176 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4177 || DECL_LANG_SPECIFIC (decl) == NULL
4178 || DECL_THUNK_P (decl))
4181 /* We only want to do this processing once. We don't need to keep trying
4182 to instantiate inline templates, because unit-at-a-time will make sure
4183 we get them compiled before functions that want to inline them. */
4184 if (DECL_ODR_USED (decl))
4187 /* If within finish_function, defer the rest until that function
4188 finishes, otherwise it might recurse. */
4189 if (defer_mark_used_calls)
4191 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4195 /* Normally, we can wait until instantiation-time to synthesize DECL.
4196 However, if DECL is a static data member initialized with a constant
4197 or a constexpr function, we need it right now because a reference to
4198 such a data member or a call to such function is not value-dependent. */
4199 if ((decl_maybe_constant_var_p (decl)
4200 || (TREE_CODE (decl) == FUNCTION_DECL
4201 && DECL_DECLARED_CONSTEXPR_P (decl)))
4202 && !DECL_INITIAL (decl)
4203 && DECL_LANG_SPECIFIC (decl)
4204 && DECL_TEMPLATE_INSTANTIATION (decl))
4206 /* Instantiating a function will result in garbage collection. We
4207 must treat this situation as if we were within the body of a
4208 function so as to avoid collecting live data only referenced from
4209 the stack (such as overload resolution candidates). */
4211 instantiate_decl (decl, /*defer_ok=*/false,
4212 /*expl_inst_class_mem_p=*/false);
4216 /* If we don't need a value, then we don't need to synthesize DECL. */
4217 if (cp_unevaluated_operand != 0)
4220 if (processing_template_decl)
4223 /* Check this too in case we're within fold_non_dependent_expr. */
4224 if (DECL_TEMPLATE_INFO (decl)
4225 && uses_template_parms (DECL_TI_ARGS (decl)))
4228 DECL_ODR_USED (decl) = 1;
4229 if (DECL_CLONED_FUNCTION_P (decl))
4230 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4232 /* DR 757: A type without linkage shall not be used as the type of a
4233 variable or function with linkage, unless
4234 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4235 o the variable or function is not used (3.2 [basic.def.odr]) or is
4236 defined in the same translation unit. */
4237 if (cxx_dialect > cxx98
4238 && decl_linkage (decl) != lk_none
4239 && !DECL_EXTERN_C_P (decl)
4240 && !DECL_ARTIFICIAL (decl)
4241 && !decl_defined_p (decl)
4242 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4244 if (is_local_extern (decl))
4245 /* There's no way to define a local extern, and adding it to
4246 the vector interferes with GC, so give an error now. */
4247 no_linkage_error (decl);
4249 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4252 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4253 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4254 /* Remember it, so we can check it was defined. */
4255 note_vague_linkage_fn (decl);
4257 /* Is it a synthesized method that needs to be synthesized? */
4258 if (TREE_CODE (decl) == FUNCTION_DECL
4259 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4260 && DECL_DEFAULTED_FN (decl)
4261 && ! DECL_INITIAL (decl))
4263 /* Remember the current location for a function we will end up
4264 synthesizing. Then we can inform the user where it was
4265 required in the case of error. */
4266 DECL_SOURCE_LOCATION (decl) = input_location;
4268 /* Synthesizing an implicitly defined member function will result in
4269 garbage collection. We must treat this situation as if we were
4270 within the body of a function so as to avoid collecting live data
4271 on the stack (such as overload resolution candidates).
4273 We could just let cp_write_global_declarations handle synthesizing
4274 this function, since we just added it to deferred_fns, but doing
4275 it at the use site produces better error messages. */
4277 synthesize_method (decl);
4279 /* If this is a synthesized method we don't need to
4280 do the instantiation test below. */
4282 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4283 && DECL_TEMPLATE_INFO (decl)
4284 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4285 || always_instantiate_p (decl)))
4286 /* If this is a function or variable that is an instance of some
4287 template, we now know that we will need to actually do the
4288 instantiation. We check that DECL is not an explicit
4289 instantiation because that is not checked in instantiate_decl.
4291 We put off instantiating functions in order to improve compile
4292 times. Maintaining a stack of active functions is expensive,
4293 and the inliner knows to instantiate any functions it might
4294 need. Therefore, we always try to defer instantiation. */
4295 instantiate_decl (decl, /*defer_ok=*/true,
4296 /*expl_inst_class_mem_p=*/false);
4299 #include "gt-cp-decl2.h"