1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
44 #include "c-family/c-common.h"
45 #include "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 (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width)))
1056 error ("width of bit-field %qD has non-integral type %qT", value,
1058 DECL_INITIAL (value) = width;
1059 SET_DECL_C_BIT_FIELD (value);
1062 DECL_IN_AGGR_P (value) = 1;
1065 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1071 /* Returns true iff ATTR is an attribute which needs to be applied at
1072 instantiation time rather than template definition time. */
1075 is_late_template_attribute (tree attr, tree decl)
1077 tree name = TREE_PURPOSE (attr);
1078 tree args = TREE_VALUE (attr);
1079 const struct attribute_spec *spec = lookup_attribute_spec (name);
1083 /* Unknown attribute. */
1086 /* Attribute weak handling wants to write out assembly right away. */
1087 if (is_attribute_p ("weak", name))
1090 /* If any of the arguments are dependent expressions, we can't evaluate
1091 the attribute until instantiation time. */
1092 for (arg = args; arg; arg = TREE_CHAIN (arg))
1094 tree t = TREE_VALUE (arg);
1096 /* If the first attribute argument is an identifier, only consider
1097 second and following arguments. Attributes like mode, format,
1098 cleanup and several target specific attributes aren't late
1099 just because they have an IDENTIFIER_NODE as first argument. */
1100 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1103 if (value_dependent_expression_p (t)
1104 || type_dependent_expression_p (t))
1108 if (TREE_CODE (decl) == TYPE_DECL
1110 || spec->type_required)
1112 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1114 /* We can't apply any attributes to a completely unknown type until
1115 instantiation time. */
1116 enum tree_code code = TREE_CODE (type);
1117 if (code == TEMPLATE_TYPE_PARM
1118 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1119 || code == TYPENAME_TYPE)
1121 /* Also defer most attributes on dependent types. This is not
1122 necessary in all cases, but is the better default. */
1123 else if (dependent_type_p (type)
1124 /* But attribute visibility specifically works on
1126 && !is_attribute_p ("visibility", name))
1135 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1136 applied at instantiation time and return them. If IS_DEPENDENT is true,
1137 the declaration itself is dependent, so all attributes should be applied
1138 at instantiation time. */
1141 splice_template_attributes (tree *attr_p, tree decl)
1144 tree late_attrs = NULL_TREE;
1145 tree *q = &late_attrs;
1152 if (is_late_template_attribute (*p, decl))
1154 ATTR_IS_DEPENDENT (*p) = 1;
1156 *p = TREE_CHAIN (*p);
1157 q = &TREE_CHAIN (*q);
1161 p = &TREE_CHAIN (*p);
1167 /* Remove any late attributes from the list in ATTR_P and attach them to
1171 save_template_attributes (tree *attr_p, tree *decl_p)
1173 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1175 tree old_attrs = NULL_TREE;
1180 if (DECL_P (*decl_p))
1181 q = &DECL_ATTRIBUTES (*decl_p);
1183 q = &TYPE_ATTRIBUTES (*decl_p);
1187 /* Place the late attributes at the beginning of the attribute
1189 TREE_CHAIN (tree_last (late_attrs)) = *q;
1192 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1194 /* We've added new attributes directly to the main variant, so
1195 now we need to update all of the other variants to include
1196 these new attributes. */
1198 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1199 variant = TYPE_NEXT_VARIANT (variant))
1201 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1202 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1207 /* Like reconstruct_complex_type, but handle also template trees. */
1210 cp_reconstruct_complex_type (tree type, tree bottom)
1214 if (TREE_CODE (type) == POINTER_TYPE)
1216 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1217 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1218 TYPE_REF_CAN_ALIAS_ALL (type));
1220 else if (TREE_CODE (type) == REFERENCE_TYPE)
1222 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1223 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1224 TYPE_REF_CAN_ALIAS_ALL (type));
1226 else if (TREE_CODE (type) == ARRAY_TYPE)
1228 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1229 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1230 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1231 element type qualification will be handled by the recursive
1232 cp_reconstruct_complex_type call and cp_build_qualified_type
1233 for ARRAY_TYPEs changes the element type. */
1236 else if (TREE_CODE (type) == FUNCTION_TYPE)
1238 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1239 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1240 outer = apply_memfn_quals (outer, type_memfn_quals (type));
1242 else if (TREE_CODE (type) == METHOD_TYPE)
1244 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1245 /* The build_method_type_directly() routine prepends 'this' to argument list,
1246 so we must compensate by getting rid of it. */
1248 = build_method_type_directly
1249 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
1251 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1253 else if (TREE_CODE (type) == OFFSET_TYPE)
1255 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1256 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1261 if (TYPE_ATTRIBUTES (type))
1262 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1263 return cp_build_qualified_type (outer, cp_type_quals (type));
1266 /* Like decl_attributes, but handle C++ complexity. */
1269 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1271 if (*decl == NULL_TREE || *decl == void_type_node
1272 || *decl == error_mark_node
1273 || attributes == NULL_TREE)
1276 if (processing_template_decl)
1278 if (check_for_bare_parameter_packs (attributes))
1281 save_template_attributes (&attributes, decl);
1282 if (attributes == NULL_TREE)
1286 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1287 decl = &DECL_TEMPLATE_RESULT (*decl);
1289 decl_attributes (decl, attributes, flags);
1291 if (TREE_CODE (*decl) == TYPE_DECL)
1292 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1295 /* Walks through the namespace- or function-scope anonymous union
1296 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1297 Returns one of the fields for use in the mangled name. */
1300 build_anon_union_vars (tree type, tree object)
1302 tree main_decl = NULL_TREE;
1305 /* Rather than write the code to handle the non-union case,
1306 just give an error. */
1307 if (TREE_CODE (type) != UNION_TYPE)
1308 error ("anonymous struct not inside named type");
1310 for (field = TYPE_FIELDS (type);
1312 field = DECL_CHAIN (field))
1317 if (DECL_ARTIFICIAL (field))
1319 if (TREE_CODE (field) != FIELD_DECL)
1321 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1322 "have non-static data members", field);
1326 if (TREE_PRIVATE (field))
1327 permerror (input_location, "private member %q+#D in anonymous union", field);
1328 else if (TREE_PROTECTED (field))
1329 permerror (input_location, "protected member %q+#D in anonymous union", field);
1331 if (processing_template_decl)
1332 ref = build_min_nt (COMPONENT_REF, object,
1333 DECL_NAME (field), NULL_TREE);
1335 ref = build_class_member_access_expr (object, field, NULL_TREE,
1336 false, tf_warning_or_error);
1338 if (DECL_NAME (field))
1342 decl = build_decl (input_location,
1343 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1344 DECL_ANON_UNION_VAR_P (decl) = 1;
1345 DECL_ARTIFICIAL (decl) = 1;
1347 base = get_base_address (object);
1348 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1349 TREE_STATIC (decl) = TREE_STATIC (base);
1350 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1352 SET_DECL_VALUE_EXPR (decl, ref);
1353 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1355 decl = pushdecl (decl);
1357 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1358 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1362 if (main_decl == NULL_TREE)
1369 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1370 anonymous union, then all members must be laid out together. PUBLIC_P
1371 is nonzero if this union is not declared static. */
1374 finish_anon_union (tree anon_union_decl)
1380 if (anon_union_decl == error_mark_node)
1383 type = TREE_TYPE (anon_union_decl);
1384 public_p = TREE_PUBLIC (anon_union_decl);
1386 /* The VAR_DECL's context is the same as the TYPE's context. */
1387 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1389 if (TYPE_FIELDS (type) == NULL_TREE)
1394 error ("namespace-scope anonymous aggregates must be static");
1398 main_decl = build_anon_union_vars (type, anon_union_decl);
1399 if (main_decl == error_mark_node)
1401 if (main_decl == NULL_TREE)
1403 warning (0, "anonymous union with no members");
1407 if (!processing_template_decl)
1409 /* Use main_decl to set the mangled name. */
1410 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1411 maybe_commonize_var (anon_union_decl);
1412 mangle_decl (anon_union_decl);
1413 DECL_NAME (anon_union_decl) = NULL_TREE;
1416 pushdecl (anon_union_decl);
1417 if (building_stmt_tree ()
1418 && at_function_scope_p ())
1419 add_decl_expr (anon_union_decl);
1420 else if (!processing_template_decl)
1421 rest_of_decl_compilation (anon_union_decl,
1422 toplevel_bindings_p (), at_eof);
1425 /* Auxiliary functions to make type signatures for
1426 `operator new' and `operator delete' correspond to
1427 what compiler will be expecting. */
1430 coerce_new_type (tree type)
1433 tree args = TYPE_ARG_TYPES (type);
1435 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1437 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1440 error ("%<operator new%> must return type %qT", ptr_type_node);
1443 if (args && args != void_list_node)
1445 if (TREE_PURPOSE (args))
1447 /* [basic.stc.dynamic.allocation]
1449 The first parameter shall not have an associated default
1451 error ("the first parameter of %<operator new%> cannot "
1452 "have a default argument");
1453 /* Throw away the default argument. */
1454 TREE_PURPOSE (args) = NULL_TREE;
1457 if (!same_type_p (TREE_VALUE (args), size_type_node))
1460 args = TREE_CHAIN (args);
1467 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1468 "as first parameter", size_type_node);
1473 args = tree_cons (NULL_TREE, size_type_node, args);
1476 type = build_exception_variant
1477 (build_function_type (ptr_type_node, args),
1478 TYPE_RAISES_EXCEPTIONS (type));
1486 coerce_delete_type (tree type)
1489 tree args = TYPE_ARG_TYPES (type);
1491 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1493 if (!same_type_p (TREE_TYPE (type), void_type_node))
1496 error ("%<operator delete%> must return type %qT", void_type_node);
1499 if (!args || args == void_list_node
1500 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1503 if (args && args != void_list_node)
1504 args = TREE_CHAIN (args);
1505 error ("%<operator delete%> takes type %qT as first parameter",
1511 args = tree_cons (NULL_TREE, ptr_type_node, args);
1514 type = build_exception_variant
1515 (build_function_type (void_type_node, args),
1516 TYPE_RAISES_EXCEPTIONS (type));
1524 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1525 and mark them as needed. */
1528 mark_vtable_entries (tree decl)
1531 unsigned HOST_WIDE_INT idx;
1533 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1538 STRIP_NOPS (fnaddr);
1540 if (TREE_CODE (fnaddr) != ADDR_EXPR
1541 && TREE_CODE (fnaddr) != FDESC_EXPR)
1542 /* This entry is an offset: a virtual base class offset, a
1543 virtual call offset, an RTTI offset, etc. */
1546 fn = TREE_OPERAND (fnaddr, 0);
1547 TREE_ADDRESSABLE (fn) = 1;
1548 /* When we don't have vcall offsets, we output thunks whenever
1549 we output the vtables that contain them. With vcall offsets,
1550 we know all the thunks we'll need when we emit a virtual
1551 function, so we emit the thunks there instead. */
1552 if (DECL_THUNK_P (fn))
1553 use_thunk (fn, /*emit_p=*/0);
1558 /* Set DECL up to have the closest approximation of "initialized common"
1559 linkage available. */
1562 comdat_linkage (tree decl)
1565 make_decl_one_only (decl, cxx_comdat_group (decl));
1566 else if (TREE_CODE (decl) == FUNCTION_DECL
1567 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1568 /* We can just emit function and compiler-generated variables
1569 statically; having multiple copies is (for the most part) only
1572 There are two correctness issues, however: the address of a
1573 template instantiation with external linkage should be the
1574 same, independent of what translation unit asks for the
1575 address, and this will not hold when we emit multiple copies of
1576 the function. However, there's little else we can do.
1578 Also, by default, the typeinfo implementation assumes that
1579 there will be only one copy of the string used as the name for
1580 each type. Therefore, if weak symbols are unavailable, the
1581 run-time library should perform a more conservative check; it
1582 should perform a string comparison, rather than an address
1584 TREE_PUBLIC (decl) = 0;
1587 /* Static data member template instantiations, however, cannot
1588 have multiple copies. */
1589 if (DECL_INITIAL (decl) == 0
1590 || DECL_INITIAL (decl) == error_mark_node)
1591 DECL_COMMON (decl) = 1;
1592 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1594 DECL_COMMON (decl) = 1;
1595 DECL_INITIAL (decl) = error_mark_node;
1597 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1599 /* We can't do anything useful; leave vars for explicit
1601 DECL_EXTERNAL (decl) = 1;
1602 DECL_NOT_REALLY_EXTERN (decl) = 0;
1606 DECL_COMDAT (decl) = 1;
1609 /* For win32 we also want to put explicit instantiations in
1610 linkonce sections, so that they will be merged with implicit
1611 instantiations; otherwise we get duplicate symbol errors.
1612 For Darwin we do not want explicit instantiations to be
1616 maybe_make_one_only (tree decl)
1618 /* We used to say that this was not necessary on targets that support weak
1619 symbols, because the implicit instantiations will defer to the explicit
1620 one. However, that's not actually the case in SVR4; a strong definition
1621 after a weak one is an error. Also, not making explicit
1622 instantiations one_only means that we can end up with two copies of
1623 some template instantiations. */
1627 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1628 we can get away with not emitting them if they aren't used. We need
1629 to for variables so that cp_finish_decl will update their linkage,
1630 because their DECL_INITIAL may not have been set properly yet. */
1632 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1633 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1634 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1636 make_decl_one_only (decl, cxx_comdat_group (decl));
1638 if (TREE_CODE (decl) == VAR_DECL)
1640 DECL_COMDAT (decl) = 1;
1641 /* Mark it needed so we don't forget to emit it. */
1642 mark_decl_referenced (decl);
1647 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1648 This predicate will give the right answer during parsing of the
1649 function, which other tests may not. */
1652 vague_linkage_p (tree decl)
1654 /* Unfortunately, import_export_decl has not always been called
1655 before the function is processed, so we cannot simply check
1657 return (DECL_COMDAT (decl)
1658 || (((TREE_CODE (decl) == FUNCTION_DECL
1659 && DECL_DECLARED_INLINE_P (decl))
1660 || (DECL_LANG_SPECIFIC (decl)
1661 && DECL_TEMPLATE_INSTANTIATION (decl)))
1662 && TREE_PUBLIC (decl)));
1665 /* Determine whether or not we want to specifically import or export CTYPE,
1666 using various heuristics. */
1669 import_export_class (tree ctype)
1671 /* -1 for imported, 1 for exported. */
1672 int import_export = 0;
1674 /* It only makes sense to call this function at EOF. The reason is
1675 that this function looks at whether or not the first non-inline
1676 non-abstract virtual member function has been defined in this
1677 translation unit. But, we can't possibly know that until we've
1678 seen the entire translation unit. */
1679 gcc_assert (at_eof);
1681 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1684 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1685 we will have CLASSTYPE_INTERFACE_ONLY set but not
1686 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1687 heuristic because someone will supply a #pragma implementation
1688 elsewhere, and deducing it here would produce a conflict. */
1689 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1692 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1694 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1696 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1697 && !flag_implicit_templates)
1698 /* For a template class, without -fimplicit-templates, check the
1699 repository. If the virtual table is assigned to this
1700 translation unit, then export the class; otherwise, import
1702 import_export = repo_export_class_p (ctype) ? 1 : -1;
1703 else if (TYPE_POLYMORPHIC_P (ctype))
1705 /* The ABI specifies that the virtual table and associated
1706 information are emitted with the key method, if any. */
1707 tree method = CLASSTYPE_KEY_METHOD (ctype);
1708 /* If weak symbol support is not available, then we must be
1709 careful not to emit the vtable when the key function is
1710 inline. An inline function can be defined in multiple
1711 translation units. If we were to emit the vtable in each
1712 translation unit containing a definition, we would get
1713 multiple definition errors at link-time. */
1714 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1715 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1718 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1719 a definition anywhere else. */
1720 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1723 /* Allow back ends the chance to overrule the decision. */
1724 if (targetm.cxx.import_export_class)
1725 import_export = targetm.cxx.import_export_class (ctype, import_export);
1729 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1730 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1734 /* Return true if VAR has already been provided to the back end; in that
1735 case VAR should not be modified further by the front end. */
1737 var_finalized_p (tree var)
1739 return varpool_node (var)->finalized;
1742 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1743 must be emitted in this translation unit. Mark it as such. */
1746 mark_needed (tree decl)
1748 /* It's possible that we no longer need to set
1749 TREE_SYMBOL_REFERENCED here directly, but doing so is
1751 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1752 mark_decl_referenced (decl);
1755 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1756 returns true if a definition of this entity should be provided in
1757 this object file. Callers use this function to determine whether
1758 or not to let the back end know that a definition of DECL is
1759 available in this translation unit. */
1762 decl_needed_p (tree decl)
1764 gcc_assert (TREE_CODE (decl) == VAR_DECL
1765 || TREE_CODE (decl) == FUNCTION_DECL);
1766 /* This function should only be called at the end of the translation
1767 unit. We cannot be sure of whether or not something will be
1768 COMDAT until that point. */
1769 gcc_assert (at_eof);
1771 /* All entities with external linkage that are not COMDAT should be
1772 emitted; they may be referred to from other object files. */
1773 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1775 /* If this entity was used, let the back end see it; it will decide
1776 whether or not to emit it into the object file. */
1777 if (TREE_USED (decl)
1778 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1779 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1781 /* Functions marked "dllexport" must be emitted so that they are
1782 visible to other DLLs. */
1783 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1785 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1786 reference to DECL might cause it to be emitted later. */
1790 /* If necessary, write out the vtables for the dynamic class CTYPE.
1791 Returns true if any vtables were emitted. */
1794 maybe_emit_vtables (tree ctype)
1799 struct varpool_node *current = NULL, *last = NULL, *first = NULL;
1801 /* If the vtables for this class have already been emitted there is
1802 nothing more to do. */
1803 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1804 if (var_finalized_p (primary_vtbl))
1806 /* Ignore dummy vtables made by get_vtable_decl. */
1807 if (TREE_TYPE (primary_vtbl) == void_type_node)
1810 /* On some targets, we cannot determine the key method until the end
1811 of the translation unit -- which is when this function is
1813 if (!targetm.cxx.key_method_may_be_inline ())
1814 determine_key_method (ctype);
1816 /* See if any of the vtables are needed. */
1817 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1819 import_export_decl (vtbl);
1820 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1825 /* If the references to this class' vtables are optimized away,
1826 still emit the appropriate debugging information. See
1828 if (DECL_COMDAT (primary_vtbl)
1829 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1830 note_debug_info_needed (ctype);
1834 /* The ABI requires that we emit all of the vtables if we emit any
1836 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1838 /* Mark entities references from the virtual table as used. */
1839 mark_vtable_entries (vtbl);
1841 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1843 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1845 /* It had better be all done at compile-time. */
1850 DECL_EXTERNAL (vtbl) = 0;
1851 rest_of_decl_compilation (vtbl, 1, 1);
1853 /* Because we're only doing syntax-checking, we'll never end up
1854 actually marking the variable as written. */
1855 if (flag_syntax_only)
1856 TREE_ASM_WRITTEN (vtbl) = 1;
1857 else if (DECL_COMDAT (vtbl))
1859 current = varpool_node (vtbl);
1861 last->same_comdat_group = current;
1869 last->same_comdat_group = first;
1871 /* Since we're writing out the vtable here, also write the debug
1873 note_debug_info_needed (ctype);
1878 /* A special return value from type_visibility meaning internal
1881 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1883 /* walk_tree helper function for type_visibility. */
1886 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1888 int *vis_p = (int *)data;
1893 else if (CLASS_TYPE_P (*tp))
1895 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1897 *vis_p = VISIBILITY_ANON;
1900 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1901 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1906 /* Returns the visibility of TYPE, which is the minimum visibility of its
1910 type_visibility (tree type)
1912 int vis = VISIBILITY_DEFAULT;
1913 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1917 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1918 specified (or if VISIBILITY is static). */
1921 constrain_visibility (tree decl, int visibility)
1923 if (visibility == VISIBILITY_ANON)
1925 /* extern "C" declarations aren't affected by the anonymous
1927 if (!DECL_EXTERN_C_P (decl))
1929 TREE_PUBLIC (decl) = 0;
1930 DECL_WEAK (decl) = 0;
1931 DECL_COMMON (decl) = 0;
1932 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1933 DECL_INTERFACE_KNOWN (decl) = 1;
1934 if (DECL_LANG_SPECIFIC (decl))
1935 DECL_NOT_REALLY_EXTERN (decl) = 1;
1938 else if (visibility > DECL_VISIBILITY (decl)
1939 && !DECL_VISIBILITY_SPECIFIED (decl))
1941 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1947 /* Constrain the visibility of DECL based on the visibility of its template
1951 constrain_visibility_for_template (tree decl, tree targs)
1953 /* If this is a template instantiation, check the innermost
1954 template args for visibility constraints. The outer template
1955 args are covered by the class check. */
1956 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1958 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1962 tree arg = TREE_VEC_ELT (args, i-1);
1964 vis = type_visibility (arg);
1965 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1968 if (TREE_CODE (arg) == ADDR_EXPR)
1969 arg = TREE_OPERAND (arg, 0);
1970 if (TREE_CODE (arg) == VAR_DECL
1971 || TREE_CODE (arg) == FUNCTION_DECL)
1973 if (! TREE_PUBLIC (arg))
1974 vis = VISIBILITY_ANON;
1976 vis = DECL_VISIBILITY (arg);
1980 constrain_visibility (decl, vis);
1984 /* Like c_determine_visibility, but with additional C++-specific
1987 Function-scope entities can rely on the function's visibility because
1988 it is set in start_preparsed_function.
1990 Class-scope entities cannot rely on the class's visibility until the end
1991 of the enclosing class definition.
1993 Note that because namespaces have multiple independent definitions,
1994 namespace visibility is handled elsewhere using the #pragma visibility
1995 machinery rather than by decorating the namespace declaration.
1997 The goal is for constraints from the type to give a diagnostic, and
1998 other constraints to be applied silently. */
2001 determine_visibility (tree decl)
2003 tree class_type = NULL_TREE;
2005 bool orig_visibility_specified;
2006 enum symbol_visibility orig_visibility;
2008 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2010 /* Only relevant for names with external linkage. */
2011 if (!TREE_PUBLIC (decl))
2014 /* Cloned constructors and destructors get the same visibility as
2015 the underlying function. That should be set up in
2016 maybe_clone_body. */
2017 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2019 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2020 orig_visibility = DECL_VISIBILITY (decl);
2022 if (TREE_CODE (decl) == TYPE_DECL)
2024 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2025 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2026 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2031 else if (DECL_LANG_SPECIFIC (decl))
2032 use_template = DECL_USE_TEMPLATE (decl);
2036 /* If DECL is a member of a class, visibility specifiers on the
2037 class can influence the visibility of the DECL. */
2038 if (DECL_CLASS_SCOPE_P (decl))
2039 class_type = DECL_CONTEXT (decl);
2042 /* Not a class member. */
2044 /* Virtual tables have DECL_CONTEXT set to their associated class,
2045 so they are automatically handled above. */
2046 gcc_assert (TREE_CODE (decl) != VAR_DECL
2047 || !DECL_VTABLE_OR_VTT_P (decl));
2049 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2051 /* Local statics and classes get the visibility of their
2052 containing function by default, except that
2053 -fvisibility-inlines-hidden doesn't affect them. */
2054 tree fn = DECL_CONTEXT (decl);
2055 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2057 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2058 DECL_VISIBILITY_SPECIFIED (decl) =
2059 DECL_VISIBILITY_SPECIFIED (fn);
2062 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2064 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2065 but have no TEMPLATE_INFO, so don't try to check it. */
2068 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2069 && flag_visibility_ms_compat)
2071 /* Under -fvisibility-ms-compat, types are visible by default,
2072 even though their contents aren't. */
2073 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2074 int underlying_vis = type_visibility (underlying_type);
2075 if (underlying_vis == VISIBILITY_ANON
2076 || (CLASS_TYPE_P (underlying_type)
2077 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type)))
2078 constrain_visibility (decl, underlying_vis);
2080 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2082 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2084 /* tinfo visibility is based on the type it's for. */
2085 constrain_visibility
2086 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2088 /* Give the target a chance to override the visibility associated
2090 if (TREE_PUBLIC (decl)
2091 && !DECL_REALLY_EXTERN (decl)
2092 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2093 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2094 targetm.cxx.determine_class_data_visibility (decl);
2096 else if (use_template)
2097 /* Template instantiations and specializations get visibility based
2098 on their template unless they override it with an attribute. */;
2099 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2101 /* Set default visibility to whatever the user supplied with
2102 #pragma GCC visibility or a namespace visibility attribute. */
2103 DECL_VISIBILITY (decl) = default_visibility;
2104 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2110 /* If the specialization doesn't specify visibility, use the
2111 visibility from the template. */
2112 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2113 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2114 : DECL_TEMPLATE_INFO (decl));
2115 tree args = TI_ARGS (tinfo);
2117 if (args != error_mark_node)
2119 int depth = TMPL_ARGS_DEPTH (args);
2120 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2122 if (!DECL_VISIBILITY_SPECIFIED (decl))
2124 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2125 DECL_VISIBILITY_SPECIFIED (decl)
2126 = DECL_VISIBILITY_SPECIFIED (pattern);
2129 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2130 if (args && depth > template_class_depth (class_type))
2131 /* Limit visibility based on its template arguments. */
2132 constrain_visibility_for_template (decl, args);
2137 determine_visibility_from_class (decl, class_type);
2139 if (decl_anon_ns_mem_p (decl))
2140 /* Names in an anonymous namespace get internal linkage.
2141 This might change once we implement export. */
2142 constrain_visibility (decl, VISIBILITY_ANON);
2143 else if (TREE_CODE (decl) != TYPE_DECL)
2145 /* Propagate anonymity from type to decl. */
2146 int tvis = type_visibility (TREE_TYPE (decl));
2147 if (tvis == VISIBILITY_ANON
2148 || ! DECL_VISIBILITY_SPECIFIED (decl))
2149 constrain_visibility (decl, tvis);
2151 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2152 /* DR 757: A type without linkage shall not be used as the type of a
2153 variable or function with linkage, unless
2154 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2155 o the variable or function is not used (3.2 [basic.def.odr]) or is
2156 defined in the same translation unit.
2158 Since non-extern "C" decls need to be defined in the same
2159 translation unit, we can make the type internal. */
2160 constrain_visibility (decl, VISIBILITY_ANON);
2162 /* If visibility changed and DECL already has DECL_RTL, ensure
2163 symbol flags are updated. */
2164 if ((DECL_VISIBILITY (decl) != orig_visibility
2165 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2166 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2167 || TREE_CODE (decl) == FUNCTION_DECL)
2168 && DECL_RTL_SET_P (decl))
2169 make_decl_rtl (decl);
2172 /* By default, static data members and function members receive
2173 the visibility of their containing class. */
2176 determine_visibility_from_class (tree decl, tree class_type)
2178 if (DECL_VISIBILITY_SPECIFIED (decl))
2181 if (visibility_options.inlines_hidden
2182 /* Don't do this for inline templates; specializations might not be
2183 inline, and we don't want them to inherit the hidden
2184 visibility. We'll set it here for all inline instantiations. */
2185 && !processing_template_decl
2186 && TREE_CODE (decl) == FUNCTION_DECL
2187 && DECL_DECLARED_INLINE_P (decl)
2188 && (! DECL_LANG_SPECIFIC (decl)
2189 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2190 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2193 /* Default to the class visibility. */
2194 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2195 DECL_VISIBILITY_SPECIFIED (decl)
2196 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2199 /* Give the target a chance to override the visibility associated
2201 if (TREE_CODE (decl) == VAR_DECL
2202 && (DECL_TINFO_P (decl)
2203 || (DECL_VTABLE_OR_VTT_P (decl)
2204 /* Construction virtual tables are not exported because
2205 they cannot be referred to from other object files;
2206 their name is not standardized by the ABI. */
2207 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2208 && TREE_PUBLIC (decl)
2209 && !DECL_REALLY_EXTERN (decl)
2210 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2211 targetm.cxx.determine_class_data_visibility (decl);
2214 /* Constrain the visibility of a class TYPE based on the visibility of its
2215 field types. Warn if any fields require lesser visibility. */
2218 constrain_class_visibility (tree type)
2224 int vis = type_visibility (type);
2226 if (vis == VISIBILITY_ANON
2227 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2230 /* Don't warn about visibility if the class has explicit visibility. */
2231 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2232 vis = VISIBILITY_INTERNAL;
2234 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
2235 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2237 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2238 int subvis = type_visibility (ftype);
2240 if (subvis == VISIBILITY_ANON)
2242 if (!in_main_input_context ())
2244 %qT has a field %qD whose type uses the anonymous namespace",
2247 else if (MAYBE_CLASS_TYPE_P (ftype)
2248 && vis < VISIBILITY_HIDDEN
2249 && subvis >= VISIBILITY_HIDDEN)
2250 warning (OPT_Wattributes, "\
2251 %qT declared with greater visibility than the type of its field %qD",
2255 binfo = TYPE_BINFO (type);
2256 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2258 int subvis = type_visibility (TREE_TYPE (t));
2260 if (subvis == VISIBILITY_ANON)
2262 if (!in_main_input_context())
2264 %qT has a base %qT whose type uses the anonymous namespace",
2265 type, TREE_TYPE (t));
2267 else if (vis < VISIBILITY_HIDDEN
2268 && subvis >= VISIBILITY_HIDDEN)
2269 warning (OPT_Wattributes, "\
2270 %qT declared with greater visibility than its base %qT",
2271 type, TREE_TYPE (t));
2275 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2276 for DECL has not already been determined, do so now by setting
2277 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2278 function is called entities with vague linkage whose definitions
2279 are available must have TREE_PUBLIC set.
2281 If this function decides to place DECL in COMDAT, it will set
2282 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2283 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2284 callers defer that decision until it is clear that DECL is actually
2288 import_export_decl (tree decl)
2293 tree class_type = NULL_TREE;
2295 if (DECL_INTERFACE_KNOWN (decl))
2298 /* We cannot determine what linkage to give to an entity with vague
2299 linkage until the end of the file. For example, a virtual table
2300 for a class will be defined if and only if the key method is
2301 defined in this translation unit. As a further example, consider
2302 that when compiling a translation unit that uses PCH file with
2303 "-frepo" it would be incorrect to make decisions about what
2304 entities to emit when building the PCH; those decisions must be
2305 delayed until the repository information has been processed. */
2306 gcc_assert (at_eof);
2307 /* Object file linkage for explicit instantiations is handled in
2308 mark_decl_instantiated. For static variables in functions with
2309 vague linkage, maybe_commonize_var is used.
2311 Therefore, the only declarations that should be provided to this
2312 function are those with external linkage that are:
2314 * implicit instantiations of function templates
2318 * implicit instantiations of static data members of class
2325 Furthermore, all entities that reach this point must have a
2326 definition available in this translation unit.
2328 The following assertions check these conditions. */
2329 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2330 || TREE_CODE (decl) == VAR_DECL);
2331 /* Any code that creates entities with TREE_PUBLIC cleared should
2332 also set DECL_INTERFACE_KNOWN. */
2333 gcc_assert (TREE_PUBLIC (decl));
2334 if (TREE_CODE (decl) == FUNCTION_DECL)
2335 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2336 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2337 || DECL_DECLARED_INLINE_P (decl));
2339 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2340 || DECL_VTABLE_OR_VTT_P (decl)
2341 || DECL_TINFO_P (decl));
2342 /* Check that a definition of DECL is available in this translation
2344 gcc_assert (!DECL_REALLY_EXTERN (decl));
2346 /* Assume that DECL will not have COMDAT linkage. */
2348 /* Assume that DECL will not be imported into this translation
2352 /* See if the repository tells us whether or not to emit DECL in
2353 this translation unit. */
2354 emit_p = repo_emit_p (decl);
2357 else if (emit_p == 1)
2359 /* The repository indicates that this entity should be defined
2360 here. Make sure the back end honors that request. */
2361 if (TREE_CODE (decl) == VAR_DECL)
2363 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2364 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2367 FOR_EACH_CLONE (clone, decl)
2368 mark_needed (clone);
2372 /* Output the definition as an ordinary strong definition. */
2373 DECL_EXTERNAL (decl) = 0;
2374 DECL_INTERFACE_KNOWN (decl) = 1;
2379 /* We have already decided what to do with this DECL; there is no
2380 need to check anything further. */
2382 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2384 class_type = DECL_CONTEXT (decl);
2385 import_export_class (class_type);
2386 if (TYPE_FOR_JAVA (class_type))
2388 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2389 && CLASSTYPE_INTERFACE_ONLY (class_type))
2391 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2392 && !CLASSTYPE_USE_TEMPLATE (class_type)
2393 && CLASSTYPE_KEY_METHOD (class_type)
2394 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2395 /* The ABI requires that all virtual tables be emitted with
2396 COMDAT linkage. However, on systems where COMDAT symbols
2397 don't show up in the table of contents for a static
2398 archive, or on systems without weak symbols (where we
2399 approximate COMDAT linkage by using internal linkage), the
2400 linker will report errors about undefined symbols because
2401 it will not see the virtual table definition. Therefore,
2402 in the case that we know that the virtual table will be
2403 emitted in only one translation unit, we make the virtual
2404 table an ordinary definition with external linkage. */
2405 DECL_EXTERNAL (decl) = 0;
2406 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2408 /* CLASS_TYPE is being exported from this translation unit,
2409 so DECL should be defined here. */
2410 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2411 /* If a class is declared in a header with the "extern
2412 template" extension, then it will not be instantiated,
2413 even in translation units that would normally require
2414 it. Often such classes are explicitly instantiated in
2415 one translation unit. Therefore, the explicit
2416 instantiation must be made visible to other translation
2418 DECL_EXTERNAL (decl) = 0;
2421 /* The generic C++ ABI says that class data is always
2422 COMDAT, even if there is a key function. Some
2423 variants (e.g., the ARM EABI) says that class data
2424 only has COMDAT linkage if the class data might be
2425 emitted in more than one translation unit. When the
2426 key method can be inline and is inline, we still have
2427 to arrange for comdat even though
2428 class_data_always_comdat is false. */
2429 if (!CLASSTYPE_KEY_METHOD (class_type)
2430 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2431 || targetm.cxx.class_data_always_comdat ())
2433 /* The ABI requires COMDAT linkage. Normally, we
2434 only emit COMDAT things when they are needed;
2435 make sure that we realize that this entity is
2442 else if (!flag_implicit_templates
2443 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2448 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2450 tree type = TREE_TYPE (DECL_NAME (decl));
2451 if (CLASS_TYPE_P (type))
2454 import_export_class (type);
2455 if (CLASSTYPE_INTERFACE_KNOWN (type)
2456 && TYPE_POLYMORPHIC_P (type)
2457 && CLASSTYPE_INTERFACE_ONLY (type)
2458 /* If -fno-rtti was specified, then we cannot be sure
2459 that RTTI information will be emitted with the
2460 virtual table of the class, so we must emit it
2461 wherever it is used. */
2466 if (CLASSTYPE_INTERFACE_KNOWN (type)
2467 && !CLASSTYPE_INTERFACE_ONLY (type))
2469 comdat_p = (targetm.cxx.class_data_always_comdat ()
2470 || (CLASSTYPE_KEY_METHOD (type)
2471 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2476 DECL_EXTERNAL (decl) = 0;
2486 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2487 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2489 /* DECL is an implicit instantiation of a function or static
2491 if ((flag_implicit_templates
2492 && !flag_use_repository)
2493 || (flag_implicit_inline_templates
2494 && TREE_CODE (decl) == FUNCTION_DECL
2495 && DECL_DECLARED_INLINE_P (decl)))
2498 /* If we are not implicitly generating templates, then mark
2499 this entity as undefined in this translation unit. */
2502 else if (DECL_FUNCTION_MEMBER_P (decl))
2504 if (!DECL_DECLARED_INLINE_P (decl))
2506 tree ctype = DECL_CONTEXT (decl);
2507 import_export_class (ctype);
2508 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2510 DECL_NOT_REALLY_EXTERN (decl)
2511 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2512 || (DECL_DECLARED_INLINE_P (decl)
2513 && ! flag_implement_inlines
2514 && !DECL_VINDEX (decl)));
2516 if (!DECL_NOT_REALLY_EXTERN (decl))
2517 DECL_EXTERNAL (decl) = 1;
2519 /* Always make artificials weak. */
2520 if (DECL_ARTIFICIAL (decl) && flag_weak)
2523 maybe_make_one_only (decl);
2534 /* If we are importing DECL into this translation unit, mark is
2535 an undefined here. */
2536 DECL_EXTERNAL (decl) = 1;
2537 DECL_NOT_REALLY_EXTERN (decl) = 0;
2541 /* If we decided to put DECL in COMDAT, mark it accordingly at
2543 comdat_linkage (decl);
2546 DECL_INTERFACE_KNOWN (decl) = 1;
2549 /* Return an expression that performs the destruction of DECL, which
2550 must be a VAR_DECL whose type has a non-trivial destructor, or is
2551 an array whose (innermost) elements have a non-trivial destructor. */
2554 build_cleanup (tree decl)
2557 tree type = TREE_TYPE (decl);
2559 /* This function should only be called for declarations that really
2560 require cleanups. */
2561 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2563 /* Treat all objects with destructors as used; the destructor may do
2564 something substantive. */
2567 if (TREE_CODE (type) == ARRAY_TYPE)
2570 temp = build_address (decl);
2571 temp = build_delete (TREE_TYPE (temp), temp,
2572 sfk_complete_destructor,
2573 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2577 /* Returns the initialization guard variable for the variable DECL,
2578 which has static storage duration. */
2581 get_guard (tree decl)
2586 sname = mangle_guard_variable (decl);
2587 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2592 /* We use a type that is big enough to contain a mutex as well
2593 as an integer counter. */
2594 guard_type = targetm.cxx.guard_type ();
2595 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2596 VAR_DECL, sname, guard_type);
2598 /* The guard should have the same linkage as what it guards. */
2599 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2600 TREE_STATIC (guard) = TREE_STATIC (decl);
2601 DECL_COMMON (guard) = DECL_COMMON (decl);
2602 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2603 if (DECL_ONE_ONLY (decl))
2604 make_decl_one_only (guard, cxx_comdat_group (guard));
2605 if (TREE_PUBLIC (decl))
2606 DECL_WEAK (guard) = DECL_WEAK (decl);
2607 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2608 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2610 DECL_ARTIFICIAL (guard) = 1;
2611 DECL_IGNORED_P (guard) = 1;
2612 TREE_USED (guard) = 1;
2613 pushdecl_top_level_and_finish (guard, NULL_TREE);
2618 /* Return those bits of the GUARD variable that should be set when the
2619 guarded entity is actually initialized. */
2622 get_guard_bits (tree guard)
2624 if (!targetm.cxx.guard_mask_bit ())
2626 /* We only set the first byte of the guard, in order to leave room
2627 for a mutex in the high-order bits. */
2628 guard = build1 (ADDR_EXPR,
2629 build_pointer_type (TREE_TYPE (guard)),
2631 guard = build1 (NOP_EXPR,
2632 build_pointer_type (char_type_node),
2634 guard = build1 (INDIRECT_REF, char_type_node, guard);
2640 /* Return an expression which determines whether or not the GUARD
2641 variable has already been initialized. */
2644 get_guard_cond (tree guard)
2648 /* Check to see if the GUARD is zero. */
2649 guard = get_guard_bits (guard);
2651 /* Mask off all but the low bit. */
2652 if (targetm.cxx.guard_mask_bit ())
2654 guard_value = integer_one_node;
2655 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2656 guard_value = convert (TREE_TYPE (guard), guard_value);
2657 guard = cp_build_binary_op (input_location,
2658 BIT_AND_EXPR, guard, guard_value,
2659 tf_warning_or_error);
2662 guard_value = integer_zero_node;
2663 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2664 guard_value = convert (TREE_TYPE (guard), guard_value);
2665 return cp_build_binary_op (input_location,
2666 EQ_EXPR, guard, guard_value,
2667 tf_warning_or_error);
2670 /* Return an expression which sets the GUARD variable, indicating that
2671 the variable being guarded has been initialized. */
2674 set_guard (tree guard)
2678 /* Set the GUARD to one. */
2679 guard = get_guard_bits (guard);
2680 guard_init = integer_one_node;
2681 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2682 guard_init = convert (TREE_TYPE (guard), guard_init);
2683 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2684 tf_warning_or_error);
2687 /* Start the process of running a particular set of global constructors
2688 or destructors. Subroutine of do_[cd]tors. */
2691 start_objects (int method_type, int initp)
2697 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2699 if (initp != DEFAULT_INIT_PRIORITY)
2709 sprintf (type, "sub_%c%c%.5u", method_type, joiner, initp);
2712 sprintf (type, "sub_%c", method_type);
2714 fndecl = build_lang_decl (FUNCTION_DECL,
2715 get_file_function_name (type),
2716 build_function_type_list (void_type_node,
2718 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2720 TREE_PUBLIC (current_function_decl) = 0;
2722 /* Mark as artificial because it's not explicitly in the user's
2724 DECL_ARTIFICIAL (current_function_decl) = 1;
2726 /* Mark this declaration as used to avoid spurious warnings. */
2727 TREE_USED (current_function_decl) = 1;
2729 /* Mark this function as a global constructor or destructor. */
2730 if (method_type == 'I')
2731 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2733 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2735 body = begin_compound_stmt (BCS_FN_BODY);
2740 /* Finish the process of running a particular set of global constructors
2741 or destructors. Subroutine of do_[cd]tors. */
2744 finish_objects (int method_type, int initp, tree body)
2749 finish_compound_stmt (body);
2750 fn = finish_function (0);
2752 if (method_type == 'I')
2754 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2755 decl_init_priority_insert (fn, initp);
2759 DECL_STATIC_DESTRUCTOR (fn) = 1;
2760 decl_fini_priority_insert (fn, initp);
2763 expand_or_defer_fn (fn);
2766 /* The names of the parameters to the function created to handle
2767 initializations and destructions for objects with static storage
2769 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2770 #define PRIORITY_IDENTIFIER "__priority"
2772 /* The name of the function we create to handle initializations and
2773 destructions for objects with static storage duration. */
2774 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2776 /* The declaration for the __INITIALIZE_P argument. */
2777 static GTY(()) tree initialize_p_decl;
2779 /* The declaration for the __PRIORITY argument. */
2780 static GTY(()) tree priority_decl;
2782 /* The declaration for the static storage duration function. */
2783 static GTY(()) tree ssdf_decl;
2785 /* All the static storage duration functions created in this
2786 translation unit. */
2787 static GTY(()) VEC(tree,gc) *ssdf_decls;
2789 /* A map from priority levels to information about that priority
2790 level. There may be many such levels, so efficient lookup is
2792 static splay_tree priority_info_map;
2794 /* Begins the generation of the function that will handle all
2795 initialization and destruction of objects with static storage
2796 duration. The function generated takes two parameters of type
2797 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2798 nonzero, it performs initializations. Otherwise, it performs
2799 destructions. It only performs those initializations or
2800 destructions with the indicated __PRIORITY. The generated function
2803 It is assumed that this function will only be called once per
2804 translation unit. */
2807 start_static_storage_duration_function (unsigned count)
2811 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2813 /* Create the identifier for this function. It will be of the form
2814 SSDF_IDENTIFIER_<number>. */
2815 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2817 type = build_function_type_list (void_type_node,
2818 integer_type_node, integer_type_node,
2821 /* Create the FUNCTION_DECL itself. */
2822 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2823 get_identifier (id),
2825 TREE_PUBLIC (ssdf_decl) = 0;
2826 DECL_ARTIFICIAL (ssdf_decl) = 1;
2828 /* Put this function in the list of functions to be called from the
2829 static constructors and destructors. */
2832 ssdf_decls = VEC_alloc (tree, gc, 32);
2834 /* Take this opportunity to initialize the map from priority
2835 numbers to information about that priority level. */
2836 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2837 /*delete_key_fn=*/0,
2838 /*delete_value_fn=*/
2839 (splay_tree_delete_value_fn) &free);
2841 /* We always need to generate functions for the
2842 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2843 priorities later, we'll be sure to find the
2844 DEFAULT_INIT_PRIORITY. */
2845 get_priority_info (DEFAULT_INIT_PRIORITY);
2848 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2850 /* Create the argument list. */
2851 initialize_p_decl = cp_build_parm_decl
2852 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2853 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2854 TREE_USED (initialize_p_decl) = 1;
2855 priority_decl = cp_build_parm_decl
2856 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2857 DECL_CONTEXT (priority_decl) = ssdf_decl;
2858 TREE_USED (priority_decl) = 1;
2860 DECL_CHAIN (initialize_p_decl) = priority_decl;
2861 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2863 /* Put the function in the global scope. */
2864 pushdecl (ssdf_decl);
2866 /* Start the function itself. This is equivalent to declaring the
2869 static void __ssdf (int __initialize_p, init __priority_p);
2871 It is static because we only need to call this function from the
2872 various constructor and destructor functions for this module. */
2873 start_preparsed_function (ssdf_decl,
2874 /*attrs=*/NULL_TREE,
2877 /* Set up the scope of the outermost block in the function. */
2878 body = begin_compound_stmt (BCS_FN_BODY);
2883 /* Finish the generation of the function which performs initialization
2884 and destruction of objects with static storage duration. After
2885 this point, no more such objects can be created. */
2888 finish_static_storage_duration_function (tree body)
2890 /* Close out the function. */
2891 finish_compound_stmt (body);
2892 expand_or_defer_fn (finish_function (0));
2895 /* Return the information about the indicated PRIORITY level. If no
2896 code to handle this level has yet been generated, generate the
2897 appropriate prologue. */
2899 static priority_info
2900 get_priority_info (int priority)
2905 n = splay_tree_lookup (priority_info_map,
2906 (splay_tree_key) priority);
2909 /* Create a new priority information structure, and insert it
2911 pi = XNEW (struct priority_info_s);
2912 pi->initializations_p = 0;
2913 pi->destructions_p = 0;
2914 splay_tree_insert (priority_info_map,
2915 (splay_tree_key) priority,
2916 (splay_tree_value) pi);
2919 pi = (priority_info) n->value;
2924 /* The effective initialization priority of a DECL. */
2926 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2927 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2928 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2930 /* Whether a DECL needs a guard to protect it against multiple
2933 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2934 || DECL_ONE_ONLY (decl) \
2935 || DECL_WEAK (decl)))
2937 /* Called from one_static_initialization_or_destruction(),
2939 Walks the initializer list of a global variable and looks for
2940 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2941 and that have their DECL_CONTEXT() == NULL.
2942 For each such temporary variable, set their DECL_CONTEXT() to
2943 the current function. This is necessary because otherwise
2944 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2945 when trying to refer to a temporary variable that does not have
2946 it's DECL_CONTECT() properly set. */
2948 fix_temporary_vars_context_r (tree *node,
2949 int *unused ATTRIBUTE_UNUSED,
2950 void *unused1 ATTRIBUTE_UNUSED)
2952 gcc_assert (current_function_decl);
2954 if (TREE_CODE (*node) == BIND_EXPR)
2958 for (var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var))
2959 if (TREE_CODE (var) == VAR_DECL
2961 && DECL_ARTIFICIAL (var)
2962 && !DECL_CONTEXT (var))
2963 DECL_CONTEXT (var) = current_function_decl;
2969 /* Set up to handle the initialization or destruction of DECL. If
2970 INITP is nonzero, we are initializing the variable. Otherwise, we
2971 are destroying it. */
2974 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2976 tree guard_if_stmt = NULL_TREE;
2979 /* If we are supposed to destruct and there's a trivial destructor,
2980 nothing has to be done. */
2982 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2985 /* Trick the compiler into thinking we are at the file and line
2986 where DECL was declared so that error-messages make sense, and so
2987 that the debugger will show somewhat sensible file and line
2989 input_location = DECL_SOURCE_LOCATION (decl);
2991 /* Make sure temporary variables in the initialiser all have
2992 their DECL_CONTEXT() set to a value different from NULL_TREE.
2993 This can happen when global variables initialisers are built.
2994 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
2995 the temporary variables that might have been generated in the
2996 accompagning initialisers is NULL_TREE, meaning the variables have been
2997 declared in the global namespace.
2998 What we want to do here is to fix that and make sure the DECL_CONTEXT()
2999 of the temporaries are set to the current function decl. */
3000 cp_walk_tree_without_duplicates (&init,
3001 fix_temporary_vars_context_r,
3008 Access control for implicit calls to the constructors,
3009 the conversion functions, or the destructor called to
3010 create and destroy a static data member is performed as
3011 if these calls appeared in the scope of the member's
3014 we pretend we are in a static member function of the class of
3015 which the DECL is a member. */
3016 if (member_p (decl))
3018 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3019 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3022 /* Assume we don't need a guard. */
3024 /* We need a guard if this is an object with external linkage that
3025 might be initialized in more than one place. (For example, a
3026 static data member of a template, when the data member requires
3028 if (NEEDS_GUARD_P (decl))
3032 guard = get_guard (decl);
3034 /* When using __cxa_atexit, we just check the GUARD as we would
3035 for a local static. */
3036 if (flag_use_cxa_atexit)
3038 /* When using __cxa_atexit, we never try to destroy
3039 anything from a static destructor. */
3041 guard_cond = get_guard_cond (guard);
3043 /* If we don't have __cxa_atexit, then we will be running
3044 destructors from .fini sections, or their equivalents. So,
3045 we need to know how many times we've tried to initialize this
3046 object. We do initializations only if the GUARD is zero,
3047 i.e., if we are the first to initialize the variable. We do
3048 destructions only if the GUARD is one, i.e., if we are the
3049 last to destroy the variable. */
3052 = cp_build_binary_op (input_location,
3054 cp_build_unary_op (PREINCREMENT_EXPR,
3057 tf_warning_or_error),
3059 tf_warning_or_error);
3062 = cp_build_binary_op (input_location,
3064 cp_build_unary_op (PREDECREMENT_EXPR,
3067 tf_warning_or_error),
3069 tf_warning_or_error);
3071 guard_if_stmt = begin_if_stmt ();
3072 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3076 /* If we're using __cxa_atexit, we have not already set the GUARD,
3077 so we must do so now. */
3078 if (guard && initp && flag_use_cxa_atexit)
3079 finish_expr_stmt (set_guard (guard));
3081 /* Perform the initialization or destruction. */
3085 finish_expr_stmt (init);
3087 /* If we're using __cxa_atexit, register a function that calls the
3088 destructor for the object. */
3089 if (flag_use_cxa_atexit)
3090 finish_expr_stmt (register_dtor_fn (decl));
3093 finish_expr_stmt (build_cleanup (decl));
3095 /* Finish the guard if-stmt, if necessary. */
3098 finish_then_clause (guard_if_stmt);
3099 finish_if_stmt (guard_if_stmt);
3102 /* Now that we're done with DECL we don't need to pretend to be a
3103 member of its class any longer. */
3104 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3105 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3108 /* Generate code to do the initialization or destruction of the decls in VARS,
3109 a TREE_LIST of VAR_DECL with static storage duration.
3110 Whether initialization or destruction is performed is specified by INITP. */
3113 do_static_initialization_or_destruction (tree vars, bool initp)
3115 tree node, init_if_stmt, cond;
3117 /* Build the outer if-stmt to check for initialization or destruction. */
3118 init_if_stmt = begin_if_stmt ();
3119 cond = initp ? integer_one_node : integer_zero_node;
3120 cond = cp_build_binary_op (input_location,
3124 tf_warning_or_error);
3125 finish_if_stmt_cond (cond, init_if_stmt);
3129 tree decl = TREE_VALUE (node);
3130 tree priority_if_stmt;
3134 /* If we don't need a destructor, there's nothing to do. Avoid
3135 creating a possibly empty if-stmt. */
3136 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3138 node = TREE_CHAIN (node);
3142 /* Remember that we had an initialization or finalization at this
3144 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3145 pi = get_priority_info (priority);
3147 pi->initializations_p = 1;
3149 pi->destructions_p = 1;
3151 /* Conditionalize this initialization on being in the right priority
3152 and being initializing/finalizing appropriately. */
3153 priority_if_stmt = begin_if_stmt ();
3154 cond = cp_build_binary_op (input_location,
3157 build_int_cst (NULL_TREE, priority),
3158 tf_warning_or_error);
3159 finish_if_stmt_cond (cond, priority_if_stmt);
3161 /* Process initializers with same priority. */
3163 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3164 node = TREE_CHAIN (node))
3165 /* Do one initialization or destruction. */
3166 one_static_initialization_or_destruction (TREE_VALUE (node),
3167 TREE_PURPOSE (node), initp);
3169 /* Finish up the priority if-stmt body. */
3170 finish_then_clause (priority_if_stmt);
3171 finish_if_stmt (priority_if_stmt);
3175 /* Finish up the init/destruct if-stmt body. */
3176 finish_then_clause (init_if_stmt);
3177 finish_if_stmt (init_if_stmt);
3180 /* VARS is a list of variables with static storage duration which may
3181 need initialization and/or finalization. Remove those variables
3182 that don't really need to be initialized or finalized, and return
3183 the resulting list. The order in which the variables appear in
3184 VARS is in reverse order of the order in which they should actually
3185 be initialized. The list we return is in the unreversed order;
3186 i.e., the first variable should be initialized first. */
3189 prune_vars_needing_no_initialization (tree *vars)
3192 tree result = NULL_TREE;
3197 tree decl = TREE_VALUE (t);
3198 tree init = TREE_PURPOSE (t);
3200 /* Deal gracefully with error. */
3201 if (decl == error_mark_node)
3203 var = &TREE_CHAIN (t);
3207 /* The only things that can be initialized are variables. */
3208 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3210 /* If this object is not defined, we don't need to do anything
3212 if (DECL_EXTERNAL (decl))
3214 var = &TREE_CHAIN (t);
3218 /* Also, if the initializer already contains errors, we can bail
3220 if (init && TREE_CODE (init) == TREE_LIST
3221 && value_member (error_mark_node, init))
3223 var = &TREE_CHAIN (t);
3227 /* This variable is going to need initialization and/or
3228 finalization, so we add it to the list. */
3229 *var = TREE_CHAIN (t);
3230 TREE_CHAIN (t) = result;
3237 /* Make sure we have told the back end about all the variables in
3241 write_out_vars (tree vars)
3245 for (v = vars; v; v = TREE_CHAIN (v))
3247 tree var = TREE_VALUE (v);
3248 if (!var_finalized_p (var))
3250 import_export_decl (var);
3251 rest_of_decl_compilation (var, 1, 1);
3256 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3257 (otherwise) that will initialize all global objects with static
3258 storage duration having the indicated PRIORITY. */
3261 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3269 input_location = *locus;
3271 /* Was: locus->line++; */
3273 /* We use `I' to indicate initialization and `D' to indicate
3275 function_key = constructor_p ? 'I' : 'D';
3277 /* We emit the function lazily, to avoid generating empty
3278 global constructors and destructors. */
3281 /* For Objective-C++, we may need to initialize metadata found in this module.
3282 This must be done _before_ any other static initializations. */
3283 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3284 && constructor_p && objc_static_init_needed_p ())
3286 body = start_objects (function_key, priority);
3287 objc_generate_static_init_call (NULL_TREE);
3290 /* Call the static storage duration function with appropriate
3292 FOR_EACH_VEC_ELT (tree, ssdf_decls, i, fndecl)
3294 /* Calls to pure or const functions will expand to nothing. */
3295 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3300 body = start_objects (function_key, priority);
3302 call = cp_build_function_call_nary (fndecl, tf_warning_or_error,
3303 build_int_cst (NULL_TREE,
3305 build_int_cst (NULL_TREE,
3308 finish_expr_stmt (call);
3312 /* Close out the function. */
3314 finish_objects (function_key, priority, body);
3317 /* Generate constructor and destructor functions for the priority
3321 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3323 location_t *locus = (location_t *) data;
3324 int priority = (int) n->key;
3325 priority_info pi = (priority_info) n->value;
3327 /* Generate the functions themselves, but only if they are really
3329 if (pi->initializations_p)
3330 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3331 if (pi->destructions_p)
3332 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3334 /* Keep iterating. */
3338 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3339 decls referenced from front-end specific constructs; it will be called
3340 only for language-specific tree nodes.
3342 Here we must deal with member pointers. */
3345 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3349 switch (TREE_CODE (t))
3352 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3353 cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3356 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3357 cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3360 if (DECL_CONTEXT (t)
3361 && flag_use_repository
3362 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3363 /* If we need a static variable in a function, then we
3364 need the containing function. */
3365 mark_decl_referenced (DECL_CONTEXT (t));
3374 /* Java requires that we be able to reference a local address for a
3375 method, and not be confused by PLT entries. If hidden aliases are
3376 supported, collect and return all the functions for which we should
3377 emit a hidden alias. */
3379 static struct pointer_set_t *
3380 collect_candidates_for_java_method_aliases (void)
3382 struct cgraph_node *node;
3383 struct pointer_set_t *candidates = NULL;
3385 #ifndef HAVE_GAS_HIDDEN
3389 for (node = cgraph_nodes; node ; node = node->next)
3391 tree fndecl = node->decl;
3393 if (DECL_CONTEXT (fndecl)
3394 && TYPE_P (DECL_CONTEXT (fndecl))
3395 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3396 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3398 if (candidates == NULL)
3399 candidates = pointer_set_create ();
3400 pointer_set_insert (candidates, fndecl);
3408 /* Java requires that we be able to reference a local address for a
3409 method, and not be confused by PLT entries. If hidden aliases are
3410 supported, emit one for each java function that we've emitted.
3411 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3412 by collect_candidates_for_java_method_aliases. */
3415 build_java_method_aliases (struct pointer_set_t *candidates)
3417 struct cgraph_node *node;
3419 #ifndef HAVE_GAS_HIDDEN
3423 for (node = cgraph_nodes; node ; node = node->next)
3425 tree fndecl = node->decl;
3427 if (TREE_ASM_WRITTEN (fndecl)
3428 && pointer_set_contains (candidates, fndecl))
3430 /* Mangle the name in a predictable way; we need to reference
3431 this from a java compiled object file. */
3432 tree oid, nid, alias;
3436 oid = DECL_ASSEMBLER_NAME (fndecl);
3437 oname = IDENTIFIER_POINTER (oid);
3438 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3439 nname = ACONCAT (("_ZGA", oname+2, NULL));
3440 nid = get_identifier (nname);
3442 alias = make_alias_for (fndecl, nid);
3443 TREE_PUBLIC (alias) = 1;
3444 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3446 assemble_alias (alias, oid);
3451 /* Return C++ property of T, based on given operation OP. */
3454 cpp_check (tree t, cpp_operation op)
3459 return DECL_PURE_VIRTUAL_P (t);
3460 case IS_CONSTRUCTOR:
3461 return DECL_CONSTRUCTOR_P (t);
3463 return DECL_DESTRUCTOR_P (t);
3464 case IS_COPY_CONSTRUCTOR:
3465 return DECL_COPY_CONSTRUCTOR_P (t);
3467 return TREE_CODE (t) == TEMPLATE_DECL;
3473 /* Collect source file references recursively, starting from NAMESPC. */
3476 collect_source_refs (tree namespc)
3483 /* Iterate over names in this name space. */
3484 for (t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
3485 if (!DECL_IS_BUILTIN (t) )
3486 collect_source_ref (DECL_SOURCE_FILE (t));
3488 /* Dump siblings, if any */
3489 collect_source_refs (TREE_CHAIN (namespc));
3491 /* Dump children, if any */
3492 collect_source_refs (NAMESPACE_LEVEL (namespc)->namespaces);
3495 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
3496 starting from NAMESPC. */
3499 collect_ada_namespace (tree namespc, const char *source_file)
3504 /* Collect decls from this namespace */
3505 collect_ada_nodes (NAMESPACE_LEVEL (namespc)->names, source_file);
3507 /* Collect siblings, if any */
3508 collect_ada_namespace (TREE_CHAIN (namespc), source_file);
3510 /* Collect children, if any */
3511 collect_ada_namespace (NAMESPACE_LEVEL (namespc)->namespaces, source_file);
3514 /* Returns true iff there is a definition available for variable or
3518 decl_defined_p (tree decl)
3520 if (TREE_CODE (decl) == FUNCTION_DECL)
3521 return (DECL_INITIAL (decl) != NULL_TREE);
3524 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3525 return !DECL_EXTERNAL (decl);
3529 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
3533 An integral constant-expression can only involve ... const
3534 variables of integral or enumeration types initialized with
3535 constant expressions ...
3537 C++0x also allows constexpr variables and temporaries initialized
3538 with constant expressions. We handle the former here, but the latter
3539 are just folded away in cxx_eval_constant_expression.
3541 The standard does not require that the expression be non-volatile.
3542 G++ implements the proposed correction in DR 457. */
3545 decl_constant_var_p (tree decl)
3548 tree type = TREE_TYPE (decl);
3549 if (TREE_CODE (decl) != VAR_DECL)
3551 if (DECL_DECLARED_CONSTEXPR_P (decl))
3553 else if (CP_TYPE_CONST_NON_VOLATILE_P (type)
3554 && INTEGRAL_OR_ENUMERATION_TYPE_P (type))
3556 /* We don't know if a template static data member is initialized with
3557 a constant expression until we instantiate its initializer. */
3559 ret = DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl);
3564 gcc_assert (!ret || DECL_INITIAL (decl));
3568 /* Returns true if DECL could be a symbolic constant variable, depending on
3572 decl_maybe_constant_var_p (tree decl)
3574 tree type = TREE_TYPE (decl);
3575 if (TREE_CODE (decl) != VAR_DECL)
3577 if (DECL_DECLARED_CONSTEXPR_P (decl))
3579 return (CP_TYPE_CONST_NON_VOLATILE_P (type)
3580 && INTEGRAL_OR_ENUMERATION_TYPE_P (type));
3583 /* Complain that DECL uses a type with no linkage but is never defined. */
3586 no_linkage_error (tree decl)
3588 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3589 if (TYPE_ANONYMOUS_P (t))
3591 permerror (0, "%q+#D, declared using anonymous type, "
3592 "is used but never defined", decl);
3593 if (is_typedef_decl (TYPE_NAME (t)))
3594 permerror (0, "%q+#D does not refer to the unqualified type, "
3595 "so it is not used for linkage", TYPE_NAME (t));
3598 permerror (0, "%q+#D, declared using local type %qT, "
3599 "is used but never defined", decl, t);
3602 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
3605 collect_all_refs (const char *source_file)
3607 collect_ada_namespace (global_namespace, source_file);
3610 /* This routine is called at the end of compilation.
3611 Its job is to create all the code needed to initialize and
3612 destroy the global aggregates. We do the destruction
3613 first, since that way we only need to reverse the decls once. */
3616 cp_write_global_declarations (void)
3622 unsigned ssdf_count = 0;
3625 struct pointer_set_t *candidates;
3627 locus = input_location;
3630 /* Bad parse errors. Just forget about it. */
3631 if (! global_bindings_p () || current_class_type
3632 || !VEC_empty (tree,decl_namespace_list))
3636 c_common_write_pch ();
3638 /* Handle -fdump-ada-spec[-slim] */
3639 if (dump_enabled_p (TDI_ada))
3641 if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM)
3642 collect_source_ref (main_input_filename);
3644 collect_source_refs (global_namespace);
3646 dump_ada_specs (collect_all_refs, cpp_check);
3649 /* FIXME - huh? was input_line -= 1;*/
3651 /* We now have to write out all the stuff we put off writing out.
3654 o Template specializations that we have not yet instantiated,
3655 but which are needed.
3656 o Initialization and destruction for non-local objects with
3657 static storage duration. (Local objects with static storage
3658 duration are initialized when their scope is first entered,
3659 and are cleaned up via atexit.)
3660 o Virtual function tables.
3662 All of these may cause others to be needed. For example,
3663 instantiating one function may cause another to be needed, and
3664 generating the initializer for an object may cause templates to be
3665 instantiated, etc., etc. */
3667 timevar_push (TV_VARCONST);
3669 emit_support_tinfos ();
3678 /* If there are templates that we've put off instantiating, do
3680 instantiate_pending_templates (retries);
3683 /* Write out virtual tables as required. Note that writing out
3684 the virtual table for a template class may cause the
3685 instantiation of members of that class. If we write out
3686 vtables then we remove the class from our list so we don't
3687 have to look at it again. */
3689 while (keyed_classes != NULL_TREE
3690 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3693 keyed_classes = TREE_CHAIN (keyed_classes);
3699 tree next = TREE_CHAIN (t);
3703 if (maybe_emit_vtables (TREE_VALUE (next)))
3706 TREE_CHAIN (t) = TREE_CHAIN (next);
3711 next = TREE_CHAIN (t);
3715 /* Write out needed type info variables. We have to be careful
3716 looping through unemitted decls, because emit_tinfo_decl may
3717 cause other variables to be needed. New elements will be
3718 appended, and we remove from the vector those that actually
3720 for (i = VEC_length (tree, unemitted_tinfo_decls);
3721 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3722 if (emit_tinfo_decl (t))
3725 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3728 /* The list of objects with static storage duration is built up
3729 in reverse order. We clear STATIC_AGGREGATES so that any new
3730 aggregates added during the initialization of these will be
3731 initialized in the correct order when we next come around the
3733 vars = prune_vars_needing_no_initialization (&static_aggregates);
3737 /* We need to start a new initialization function each time
3738 through the loop. That's because we need to know which
3739 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3740 isn't computed until a function is finished, and written
3741 out. That's a deficiency in the back end. When this is
3742 fixed, these initialization functions could all become
3743 inline, with resulting performance improvements. */
3746 /* Set the line and file, so that it is obviously not from
3748 input_location = locus;
3749 ssdf_body = start_static_storage_duration_function (ssdf_count);
3751 /* Make sure the back end knows about all the variables. */
3752 write_out_vars (vars);
3754 /* First generate code to do all the initializations. */
3756 do_static_initialization_or_destruction (vars, /*initp=*/true);
3758 /* Then, generate code to do all the destructions. Do these
3759 in reverse order so that the most recently constructed
3760 variable is the first destroyed. If we're using
3761 __cxa_atexit, then we don't need to do this; functions
3762 were registered at initialization time to destroy the
3764 if (!flag_use_cxa_atexit && vars)
3766 vars = nreverse (vars);
3767 do_static_initialization_or_destruction (vars, /*initp=*/false);
3772 /* Finish up the static storage duration function for this
3774 input_location = locus;
3775 finish_static_storage_duration_function (ssdf_body);
3777 /* All those initializations and finalizations might cause
3778 us to need more inline functions, more template
3779 instantiations, etc. */
3782 /* ??? was: locus.line++; */
3785 /* Go through the set of inline functions whose bodies have not
3786 been emitted yet. If out-of-line copies of these functions
3787 are required, emit them. */
3788 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3790 /* Does it need synthesizing? */
3791 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3792 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3794 /* Even though we're already at the top-level, we push
3795 there again. That way, when we pop back a few lines
3796 hence, all of our state is restored. Otherwise,
3797 finish_function doesn't clean things up, and we end
3798 up with CURRENT_FUNCTION_DECL set. */
3799 push_to_top_level ();
3800 /* The decl's location will mark where it was first
3801 needed. Save that so synthesize method can indicate
3802 where it was needed from, in case of error */
3803 input_location = DECL_SOURCE_LOCATION (decl);
3804 synthesize_method (decl);
3805 pop_from_top_level ();
3809 if (!DECL_SAVED_TREE (decl))
3812 /* We lie to the back end, pretending that some functions
3813 are not defined when they really are. This keeps these
3814 functions from being put out unnecessarily. But, we must
3815 stop lying when the functions are referenced, or if they
3816 are not comdat since they need to be put out now. If
3817 DECL_INTERFACE_KNOWN, then we have already set
3818 DECL_EXTERNAL appropriately, so there's no need to check
3819 again, and we do not want to clear DECL_EXTERNAL if a
3820 previous call to import_export_decl set it.
3822 This is done in a separate for cycle, because if some
3823 deferred function is contained in another deferred
3824 function later in deferred_fns varray,
3825 rest_of_compilation would skip this function and we
3826 really cannot expand the same function twice. */
3827 import_export_decl (decl);
3828 if (DECL_NOT_REALLY_EXTERN (decl)
3829 && DECL_INITIAL (decl)
3830 && decl_needed_p (decl))
3832 struct cgraph_node *node = cgraph_get_node (decl), *alias, *next;
3834 DECL_EXTERNAL (decl) = 0;
3835 /* If we mark !DECL_EXTERNAL one of the same body aliases,
3836 we need to mark all of them that way. */
3837 if (node && node->same_body)
3839 DECL_EXTERNAL (node->decl) = 0;
3840 for (alias = node->same_body; alias; alias = alias->next)
3841 DECL_EXTERNAL (alias->decl) = 0;
3843 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3844 group, we need to mark all symbols in the same comdat group
3846 if (node->same_comdat_group)
3847 for (next = node->same_comdat_group;
3849 next = next->same_comdat_group)
3851 DECL_EXTERNAL (next->decl) = 0;
3852 if (next->same_body)
3854 for (alias = next->same_body;
3856 alias = alias->next)
3857 DECL_EXTERNAL (alias->decl) = 0;
3862 /* If we're going to need to write this function out, and
3863 there's already a body for it, create RTL for it now.
3864 (There might be no body if this is a method we haven't
3865 gotten around to synthesizing yet.) */
3866 if (!DECL_EXTERNAL (decl)
3867 && decl_needed_p (decl)
3868 && !TREE_ASM_WRITTEN (decl)
3869 && !cgraph_node (decl)->local.finalized)
3871 /* We will output the function; no longer consider it in this
3873 DECL_DEFER_OUTPUT (decl) = 0;
3874 /* Generate RTL for this function now that we know we
3876 expand_or_defer_fn (decl);
3877 /* If we're compiling -fsyntax-only pretend that this
3878 function has been written out so that we don't try to
3880 if (flag_syntax_only)
3881 TREE_ASM_WRITTEN (decl) = 1;
3886 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3889 /* Static data members are just like namespace-scope globals. */
3890 FOR_EACH_VEC_ELT (tree, pending_statics, i, decl)
3892 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3893 /* Don't write it out if we haven't seen a definition. */
3894 || DECL_IN_AGGR_P (decl))
3896 import_export_decl (decl);
3897 /* If this static data member is needed, provide it to the
3899 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3900 DECL_EXTERNAL (decl) = 0;
3902 if (VEC_length (tree, pending_statics) != 0
3903 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3904 VEC_length (tree, pending_statics)))
3911 /* All used inline functions must have a definition at this point. */
3912 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3914 if (/* Check online inline functions that were actually used. */
3915 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3916 /* If the definition actually was available here, then the
3917 fact that the function was not defined merely represents
3918 that for some reason (use of a template repository,
3919 #pragma interface, etc.) we decided not to emit the
3921 && !DECL_INITIAL (decl)
3922 /* An explicit instantiation can be used to specify
3923 that the body is in another unit. It will have
3924 already verified there was a definition. */
3925 && !DECL_EXPLICIT_INSTANTIATION (decl))
3927 warning (0, "inline function %q+D used but never defined", decl);
3928 /* Avoid a duplicate warning from check_global_declaration_1. */
3929 TREE_NO_WARNING (decl) = 1;
3933 /* So must decls that use a type with no linkage. */
3934 FOR_EACH_VEC_ELT (tree, no_linkage_decls, i, decl)
3935 if (!decl_defined_p (decl))
3936 no_linkage_error (decl);
3938 /* Then, do the Objective-C stuff. This is where all the
3939 Objective-C module stuff gets generated (symtab,
3940 class/protocol/selector lists etc). This must be done after C++
3941 templates, destructors etc. so that selectors used in C++
3942 templates are properly allocated. */
3943 if (c_dialect_objc ())
3944 objc_write_global_declarations ();
3946 /* We give C linkage to static constructors and destructors. */
3947 push_lang_context (lang_name_c);
3949 /* Generate initialization and destruction functions for all
3950 priorities for which they are required. */
3951 if (priority_info_map)
3952 splay_tree_foreach (priority_info_map,
3953 generate_ctor_and_dtor_functions_for_priority,
3955 else if (c_dialect_objc () && objc_static_init_needed_p ())
3956 /* If this is obj-c++ and we need a static init, call
3957 generate_ctor_or_dtor_function. */
3958 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3959 DEFAULT_INIT_PRIORITY, &locus);
3961 /* We're done with the splay-tree now. */
3962 if (priority_info_map)
3963 splay_tree_delete (priority_info_map);
3965 /* Generate any missing aliases. */
3966 maybe_apply_pending_pragma_weaks ();
3968 /* We're done with static constructors, so we can go back to "C++"
3970 pop_lang_context ();
3972 /* Collect candidates for Java hidden aliases. */
3973 candidates = collect_candidates_for_java_method_aliases ();
3975 cgraph_finalize_compilation_unit ();
3977 /* Now, issue warnings about static, but not defined, functions,
3978 etc., and emit debugging information. */
3979 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3980 if (VEC_length (tree, pending_statics) != 0)
3982 check_global_declarations (VEC_address (tree, pending_statics),
3983 VEC_length (tree, pending_statics));
3984 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3985 VEC_length (tree, pending_statics));
3988 perform_deferred_noexcept_checks ();
3990 /* Generate hidden aliases for Java. */
3993 build_java_method_aliases (candidates);
3994 pointer_set_destroy (candidates);
3999 /* The entire file is now complete. If requested, dump everything
4003 FILE *stream = dump_begin (TDI_tu, &flags);
4007 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
4008 dump_end (TDI_tu, stream);
4012 timevar_pop (TV_VARCONST);
4014 if (flag_detailed_statistics)
4016 dump_tree_statistics ();
4017 dump_time_statistics ();
4019 input_location = locus;
4021 #ifdef ENABLE_CHECKING
4022 validate_conversion_obstack ();
4023 #endif /* ENABLE_CHECKING */
4026 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4027 function to call in parse-tree form; it has not yet been
4028 semantically analyzed. ARGS are the arguments to the function.
4029 They have already been semantically analyzed. This may change
4033 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
4036 VEC(tree,gc) *orig_args = NULL;
4041 object = TREE_OPERAND (fn, 0);
4043 if (processing_template_decl)
4045 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
4046 || TREE_CODE (fn) == MEMBER_REF);
4047 if (type_dependent_expression_p (fn)
4048 || any_type_dependent_arguments_p (*args))
4049 return build_nt_call_vec (fn, *args);
4051 orig_args = make_tree_vector_copy (*args);
4053 /* Transform the arguments and add the implicit "this"
4054 parameter. That must be done before the FN is transformed
4055 because we depend on the form of FN. */
4056 make_args_non_dependent (*args);
4057 object = build_non_dependent_expr (object);
4058 if (TREE_CODE (fn) == DOTSTAR_EXPR)
4059 object = cp_build_addr_expr (object, tf_warning_or_error);
4060 VEC_safe_insert (tree, gc, *args, 0, object);
4061 /* Now that the arguments are done, transform FN. */
4062 fn = build_non_dependent_expr (fn);
4065 /* A qualified name corresponding to a bound pointer-to-member is
4066 represented as an OFFSET_REF:
4068 struct B { void g(); };
4070 void B::g() { (this->*p)(); } */
4071 if (TREE_CODE (fn) == OFFSET_REF)
4073 tree object_addr = cp_build_addr_expr (object, tf_warning_or_error);
4074 fn = TREE_OPERAND (fn, 1);
4075 fn = get_member_function_from_ptrfunc (&object_addr, fn);
4076 VEC_safe_insert (tree, gc, *args, 0, object_addr);
4079 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
4080 if (processing_template_decl && expr != error_mark_node)
4081 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
4083 if (orig_args != NULL)
4084 release_tree_vector (orig_args);
4091 check_default_args (tree x)
4093 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
4094 bool saw_def = false;
4095 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
4096 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
4098 if (TREE_PURPOSE (arg))
4102 error ("default argument missing for parameter %P of %q+#D", i, x);
4103 TREE_PURPOSE (arg) = error_mark_node;
4108 /* Return true if function DECL can be inlined. This is used to force
4109 instantiation of methods that might be interesting for inlining. */
4111 possibly_inlined_p (tree decl)
4113 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
4114 if (DECL_UNINLINABLE (decl))
4116 if (!optimize || pragma_java_exceptions)
4117 return DECL_DECLARED_INLINE_P (decl);
4118 /* When optimizing, we might inline everything when flatten
4119 attribute or heuristics inlining for size or autoinlining
4124 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4125 If DECL is a specialization or implicitly declared class member,
4126 generate the actual definition. */
4129 mark_used (tree decl)
4131 /* If DECL is a BASELINK for a single function, then treat it just
4132 like the DECL for the function. Otherwise, if the BASELINK is
4133 for an overloaded function, we don't know which function was
4134 actually used until after overload resolution. */
4135 if (TREE_CODE (decl) == BASELINK)
4137 decl = BASELINK_FUNCTIONS (decl);
4138 if (really_overloaded_fn (decl))
4140 decl = OVL_CURRENT (decl);
4143 /* Set TREE_USED for the benefit of -Wunused. */
4144 TREE_USED (decl) = 1;
4145 if (DECL_CLONED_FUNCTION_P (decl))
4146 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4148 if (TREE_CODE (decl) == FUNCTION_DECL
4149 && DECL_DELETED_FN (decl))
4151 if (DECL_ARTIFICIAL (decl))
4153 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
4154 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
4156 /* We mark a lambda conversion op as deleted if we can't
4157 generate it properly; see maybe_add_lambda_conv_op. */
4158 sorry ("converting lambda which uses %<...%> to "
4159 "function pointer");
4163 error ("use of deleted function %qD", decl);
4164 if (!maybe_explain_implicit_delete (decl))
4165 error_at (DECL_SOURCE_LOCATION (decl), "declared here");
4169 /* We can only check DECL_ODR_USED on variables or functions with
4170 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4171 might need special handling for. */
4172 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4173 || DECL_LANG_SPECIFIC (decl) == NULL
4174 || DECL_THUNK_P (decl))
4177 /* We only want to do this processing once. We don't need to keep trying
4178 to instantiate inline templates, because unit-at-a-time will make sure
4179 we get them compiled before functions that want to inline them. */
4180 if (DECL_ODR_USED (decl))
4183 /* If within finish_function, defer the rest until that function
4184 finishes, otherwise it might recurse. */
4185 if (defer_mark_used_calls)
4187 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4191 /* Normally, we can wait until instantiation-time to synthesize DECL.
4192 However, if DECL is a static data member initialized with a constant
4193 or a constexpr function, we need it right now because a reference to
4194 such a data member or a call to such function is not value-dependent. */
4195 if ((decl_maybe_constant_var_p (decl)
4196 || (TREE_CODE (decl) == FUNCTION_DECL
4197 && DECL_DECLARED_CONSTEXPR_P (decl)))
4198 && !DECL_INITIAL (decl)
4199 && DECL_LANG_SPECIFIC (decl)
4200 && DECL_TEMPLATE_INSTANTIATION (decl))
4202 /* Instantiating a function will result in garbage collection. We
4203 must treat this situation as if we were within the body of a
4204 function so as to avoid collecting live data only referenced from
4205 the stack (such as overload resolution candidates). */
4207 instantiate_decl (decl, /*defer_ok=*/false,
4208 /*expl_inst_class_mem_p=*/false);
4212 /* If we don't need a value, then we don't need to synthesize DECL. */
4213 if (cp_unevaluated_operand != 0)
4216 if (processing_template_decl)
4219 /* Check this too in case we're within fold_non_dependent_expr. */
4220 if (DECL_TEMPLATE_INFO (decl)
4221 && uses_template_parms (DECL_TI_ARGS (decl)))
4224 DECL_ODR_USED (decl) = 1;
4225 if (DECL_CLONED_FUNCTION_P (decl))
4226 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4228 /* DR 757: A type without linkage shall not be used as the type of a
4229 variable or function with linkage, unless
4230 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4231 o the variable or function is not used (3.2 [basic.def.odr]) or is
4232 defined in the same translation unit. */
4233 if (cxx_dialect > cxx98
4234 && decl_linkage (decl) != lk_none
4235 && !DECL_EXTERN_C_P (decl)
4236 && !DECL_ARTIFICIAL (decl)
4237 && !decl_defined_p (decl)
4238 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4240 if (is_local_extern (decl))
4241 /* There's no way to define a local extern, and adding it to
4242 the vector interferes with GC, so give an error now. */
4243 no_linkage_error (decl);
4245 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4248 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4249 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4250 /* Remember it, so we can check it was defined. */
4251 note_vague_linkage_fn (decl);
4253 /* Is it a synthesized method that needs to be synthesized? */
4254 if (TREE_CODE (decl) == FUNCTION_DECL
4255 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4256 && DECL_DEFAULTED_FN (decl)
4257 && ! DECL_INITIAL (decl))
4259 /* Remember the current location for a function we will end up
4260 synthesizing. Then we can inform the user where it was
4261 required in the case of error. */
4262 DECL_SOURCE_LOCATION (decl) = input_location;
4264 /* Synthesizing an implicitly defined member function will result in
4265 garbage collection. We must treat this situation as if we were
4266 within the body of a function so as to avoid collecting live data
4267 on the stack (such as overload resolution candidates).
4269 We could just let cp_write_global_declarations handle synthesizing
4270 this function, since we just added it to deferred_fns, but doing
4271 it at the use site produces better error messages. */
4273 synthesize_method (decl);
4275 /* If this is a synthesized method we don't need to
4276 do the instantiation test below. */
4278 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4279 && DECL_TEMPLATE_INFO (decl)
4280 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4281 || always_instantiate_p (decl)))
4282 /* If this is a function or variable that is an instance of some
4283 template, we now know that we will need to actually do the
4284 instantiation. We check that DECL is not an explicit
4285 instantiation because that is not checked in instantiate_decl.
4287 We put off instantiating functions in order to improve compile
4288 times. Maintaining a stack of active functions is expensive,
4289 and the inliner knows to instantiate any functions it might
4290 need. Therefore, we always try to defer instantiation. */
4291 instantiate_decl (decl, /*defer_ok=*/true,
4292 /*expl_inst_class_mem_p=*/false);
4295 #include "gt-cp-decl2.h"