1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010,
4 2011 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
44 #include "c-family/c-common.h"
45 #include "c-family/c-objc.h"
46 #include "tree-mudflap.h"
48 #include "tree-inline.h"
49 #include "c-family/c-pragma.h"
50 #include "tree-dump.h"
53 #include "pointer-set.h"
54 #include "splay-tree.h"
55 #include "langhooks.h"
56 #include "c-family/c-ada-spec.h"
58 extern cpp_reader *parse_in;
60 /* This structure contains information about the initializations
61 and/or destructions required for a particular priority level. */
62 typedef struct priority_info_s {
63 /* Nonzero if there have been any initializations at this priority
64 throughout the translation unit. */
65 int initializations_p;
66 /* Nonzero if there have been any destructions at this priority
67 throughout the translation unit. */
71 static void mark_vtable_entries (tree);
72 static bool maybe_emit_vtables (tree);
73 static bool acceptable_java_type (tree);
74 static tree start_objects (int, int);
75 static void finish_objects (int, int, tree);
76 static tree start_static_storage_duration_function (unsigned);
77 static void finish_static_storage_duration_function (tree);
78 static priority_info get_priority_info (int);
79 static void do_static_initialization_or_destruction (tree, bool);
80 static void one_static_initialization_or_destruction (tree, tree, bool);
81 static void generate_ctor_or_dtor_function (bool, int, location_t *);
82 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
84 static tree prune_vars_needing_no_initialization (tree *);
85 static void write_out_vars (tree);
86 static void import_export_class (tree);
87 static tree get_guard_bits (tree);
88 static void determine_visibility_from_class (tree, tree);
89 static bool decl_defined_p (tree);
91 /* A list of static class variables. This is needed, because a
92 static class variable can be declared inside the class without
93 an initializer, and then initialized, statically, outside the class. */
94 static GTY(()) VEC(tree,gc) *pending_statics;
96 /* A list of functions which were declared inline, but which we
97 may need to emit outline anyway. */
98 static GTY(()) VEC(tree,gc) *deferred_fns;
100 /* A list of decls that use types with no linkage, which we need to make
102 static GTY(()) VEC(tree,gc) *no_linkage_decls;
104 /* Nonzero if we're done parsing and into end-of-file activities. */
110 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
111 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
112 that apply to the function). */
115 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
121 if (fntype == error_mark_node || ctype == error_mark_node)
122 return error_mark_node;
124 gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
125 || TREE_CODE (fntype) == METHOD_TYPE);
127 type_quals = quals & ~TYPE_QUAL_RESTRICT;
128 ctype = cp_build_qualified_type (ctype, type_quals);
129 raises = TYPE_RAISES_EXCEPTIONS (fntype);
130 attrs = TYPE_ATTRIBUTES (fntype);
131 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
132 (TREE_CODE (fntype) == METHOD_TYPE
133 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
134 : TYPE_ARG_TYPES (fntype)));
136 fntype = build_exception_variant (fntype, raises);
138 fntype = cp_build_type_attribute_variant (fntype, attrs);
143 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
144 return type changed to NEW_RET. */
147 change_return_type (tree new_ret, tree fntype)
150 tree args = TYPE_ARG_TYPES (fntype);
151 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
152 tree attrs = TYPE_ATTRIBUTES (fntype);
154 if (same_type_p (new_ret, TREE_TYPE (fntype)))
157 if (TREE_CODE (fntype) == FUNCTION_TYPE)
159 newtype = build_function_type (new_ret, args);
160 newtype = apply_memfn_quals (newtype, type_memfn_quals (fntype));
163 newtype = build_method_type_directly
164 (class_of_this_parm (fntype), new_ret, TREE_CHAIN (args));
166 newtype = build_exception_variant (newtype, raises);
168 newtype = cp_build_type_attribute_variant (newtype, attrs);
173 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
177 cp_build_parm_decl (tree name, tree type)
179 tree parm = build_decl (input_location,
180 PARM_DECL, name, type);
181 /* DECL_ARG_TYPE is only used by the back end and the back end never
183 if (!processing_template_decl)
184 DECL_ARG_TYPE (parm) = type_passed_as (type);
186 /* If the type is a pack expansion, then we have a function
188 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
189 FUNCTION_PARAMETER_PACK_P (parm) = 1;
194 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
198 build_artificial_parm (tree name, tree type)
200 tree parm = cp_build_parm_decl (name, type);
201 DECL_ARTIFICIAL (parm) = 1;
202 /* All our artificial parms are implicitly `const'; they cannot be
204 TREE_READONLY (parm) = 1;
208 /* Constructors for types with virtual baseclasses need an "in-charge" flag
209 saying whether this constructor is responsible for initialization of
210 virtual baseclasses or not. All destructors also need this "in-charge"
211 flag, which additionally determines whether or not the destructor should
212 free the memory for the object.
214 This function adds the "in-charge" flag to member function FN if
215 appropriate. It is called from grokclassfn and tsubst.
216 FN must be either a constructor or destructor.
218 The in-charge flag follows the 'this' parameter, and is followed by the
219 VTT parm (if any), then the user-written parms. */
222 maybe_retrofit_in_chrg (tree fn)
224 tree basetype, arg_types, parms, parm, fntype;
226 /* If we've already add the in-charge parameter don't do it again. */
227 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
230 /* When processing templates we can't know, in general, whether or
231 not we're going to have virtual baseclasses. */
232 if (processing_template_decl)
235 /* We don't need an in-charge parameter for constructors that don't
236 have virtual bases. */
237 if (DECL_CONSTRUCTOR_P (fn)
238 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
241 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
242 basetype = TREE_TYPE (TREE_VALUE (arg_types));
243 arg_types = TREE_CHAIN (arg_types);
245 parms = DECL_CHAIN (DECL_ARGUMENTS (fn));
247 /* If this is a subobject constructor or destructor, our caller will
248 pass us a pointer to our VTT. */
249 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
251 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
253 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
254 DECL_CHAIN (parm) = parms;
257 /* ...and then to TYPE_ARG_TYPES. */
258 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
260 DECL_HAS_VTT_PARM_P (fn) = 1;
263 /* Then add the in-charge parm (before the VTT parm). */
264 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
265 DECL_CHAIN (parm) = parms;
267 arg_types = hash_tree_chain (integer_type_node, arg_types);
269 /* Insert our new parameter(s) into the list. */
270 DECL_CHAIN (DECL_ARGUMENTS (fn)) = parms;
272 /* And rebuild the function type. */
273 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
275 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
276 fntype = build_exception_variant (fntype,
277 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
278 if (TYPE_ATTRIBUTES (TREE_TYPE (fn)))
279 fntype = (cp_build_type_attribute_variant
280 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
281 TREE_TYPE (fn) = fntype;
283 /* Now we've got the in-charge parameter. */
284 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
287 /* Classes overload their constituent function names automatically.
288 When a function name is declared in a record structure,
289 its name is changed to it overloaded name. Since names for
290 constructors and destructors can conflict, we place a leading
293 CNAME is the name of the class we are grokking for.
295 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
297 FLAGS contains bits saying what's special about today's
298 arguments. DTOR_FLAG == DESTRUCTOR.
300 If FUNCTION is a destructor, then we must add the `auto-delete' field
301 as a second parameter. There is some hair associated with the fact
302 that we must "declare" this variable in the manner consistent with the
303 way the rest of the arguments were declared.
305 QUALS are the qualifiers for the this pointer. */
308 grokclassfn (tree ctype, tree function, enum overload_flags flags)
310 tree fn_name = DECL_NAME (function);
312 /* Even within an `extern "C"' block, members get C++ linkage. See
313 [dcl.link] for details. */
314 SET_DECL_LANGUAGE (function, lang_cplusplus);
316 if (fn_name == NULL_TREE)
318 error ("name missing for member function");
319 fn_name = get_identifier ("<anonymous>");
320 DECL_NAME (function) = fn_name;
323 DECL_CONTEXT (function) = ctype;
325 if (flags == DTOR_FLAG)
326 DECL_DESTRUCTOR_P (function) = 1;
328 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
329 maybe_retrofit_in_chrg (function);
332 /* Create an ARRAY_REF, checking for the user doing things backwards
336 grok_array_decl (tree array_expr, tree index_exp)
340 tree orig_array_expr = array_expr;
341 tree orig_index_exp = index_exp;
343 if (error_operand_p (array_expr) || error_operand_p (index_exp))
344 return error_mark_node;
346 if (processing_template_decl)
348 if (type_dependent_expression_p (array_expr)
349 || type_dependent_expression_p (index_exp))
350 return build_min_nt (ARRAY_REF, array_expr, index_exp,
351 NULL_TREE, NULL_TREE);
352 array_expr = build_non_dependent_expr (array_expr);
353 index_exp = build_non_dependent_expr (index_exp);
356 type = TREE_TYPE (array_expr);
358 type = non_reference (type);
360 /* If they have an `operator[]', use that. */
361 if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
362 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
363 array_expr, index_exp, NULL_TREE,
364 /*overloaded_p=*/NULL, tf_warning_or_error);
369 /* Otherwise, create an ARRAY_REF for a pointer or array type.
370 It is a little-known fact that, if `a' is an array and `i' is
371 an int, you can write `i[a]', which means the same thing as
373 if (TREE_CODE (type) == ARRAY_TYPE)
376 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
378 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
381 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
383 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
385 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
388 if ((p1 && i2) && (i1 && p2))
389 error ("ambiguous conversion for array subscript");
392 array_expr = p1, index_exp = i2;
394 array_expr = p2, index_exp = i1;
397 error ("invalid types %<%T[%T]%> for array subscript",
398 type, TREE_TYPE (index_exp));
399 return error_mark_node;
402 if (array_expr == error_mark_node || index_exp == error_mark_node)
403 error ("ambiguous conversion for array subscript");
405 expr = build_array_ref (input_location, array_expr, index_exp);
407 if (processing_template_decl && expr != error_mark_node)
408 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
409 NULL_TREE, NULL_TREE);
413 /* Given the cast expression EXP, checking out its validity. Either return
414 an error_mark_node if there was an unavoidable error, return a cast to
415 void for trying to delete a pointer w/ the value 0, or return the
416 call to delete. If DOING_VEC is true, we handle things differently
417 for doing an array delete.
418 Implements ARM $5.3.4. This is called from the parser. */
421 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete,
422 tsubst_flags_t complain)
426 if (exp == error_mark_node)
429 if (processing_template_decl)
431 t = build_min (DELETE_EXPR, void_type_node, exp, size);
432 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
433 DELETE_EXPR_USE_VEC (t) = doing_vec;
434 TREE_SIDE_EFFECTS (t) = 1;
438 /* An array can't have been allocated by new, so complain. */
439 if (TREE_CODE (exp) == VAR_DECL
440 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
441 warning (0, "deleting array %q#D", exp);
443 t = build_expr_type_conversion (WANT_POINTER, exp, true);
445 if (t == NULL_TREE || t == error_mark_node)
447 error ("type %q#T argument given to %<delete%>, expected pointer",
449 return error_mark_node;
452 type = TREE_TYPE (t);
454 /* As of Valley Forge, you can delete a pointer to const. */
456 /* You can't delete functions. */
457 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
459 error ("cannot delete a function. Only pointer-to-objects are "
460 "valid arguments to %<delete%>");
461 return error_mark_node;
464 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
465 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
467 warning (0, "deleting %qT is undefined", type);
471 /* Deleting a pointer with the value zero is valid and has no effect. */
472 if (integer_zerop (t))
473 return build1 (NOP_EXPR, void_type_node, t);
476 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
477 sfk_deleting_destructor,
478 use_global_delete, complain);
480 return build_delete (type, t, sfk_deleting_destructor,
481 LOOKUP_NORMAL, use_global_delete,
485 /* Report an error if the indicated template declaration is not the
486 sort of thing that should be a member template. */
489 check_member_template (tree tmpl)
493 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
494 decl = DECL_TEMPLATE_RESULT (tmpl);
496 if (TREE_CODE (decl) == FUNCTION_DECL
497 || (TREE_CODE (decl) == TYPE_DECL
498 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
500 /* The parser rejects template declarations in local classes. */
501 gcc_assert (!current_function_decl);
502 /* The parser rejects any use of virtual in a function template. */
503 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
504 && DECL_VIRTUAL_P (decl)));
506 /* The debug-information generating code doesn't know what to do
507 with member templates. */
508 DECL_IGNORED_P (tmpl) = 1;
511 error ("template declaration of %q#D", decl);
514 /* Return true iff TYPE is a valid Java parameter or return type. */
517 acceptable_java_type (tree type)
519 if (type == error_mark_node)
522 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
524 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
526 type = TREE_TYPE (type);
527 if (TREE_CODE (type) == RECORD_TYPE)
530 if (! TYPE_FOR_JAVA (type))
532 if (! CLASSTYPE_TEMPLATE_INFO (type))
534 args = CLASSTYPE_TI_ARGS (type);
535 i = TREE_VEC_LENGTH (args);
538 type = TREE_VEC_ELT (args, i);
539 if (TREE_CODE (type) == POINTER_TYPE)
540 type = TREE_TYPE (type);
541 if (! TYPE_FOR_JAVA (type))
550 /* For a METHOD in a Java class CTYPE, return true if
551 the parameter and return types are valid Java types.
552 Otherwise, print appropriate error messages, and return false. */
555 check_java_method (tree method)
558 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
559 tree ret_type = TREE_TYPE (TREE_TYPE (method));
561 if (!acceptable_java_type (ret_type))
563 error ("Java method %qD has non-Java return type %qT",
568 arg_types = TREE_CHAIN (arg_types);
569 if (DECL_HAS_IN_CHARGE_PARM_P (method))
570 arg_types = TREE_CHAIN (arg_types);
571 if (DECL_HAS_VTT_PARM_P (method))
572 arg_types = TREE_CHAIN (arg_types);
574 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
576 tree type = TREE_VALUE (arg_types);
577 if (!acceptable_java_type (type))
579 if (type != error_mark_node)
580 error ("Java method %qD has non-Java parameter type %qT",
588 /* Sanity check: report error if this function FUNCTION is not
589 really a member of the class (CTYPE) it is supposed to belong to.
590 TEMPLATE_PARMS is used to specify the template parameters of a member
591 template passed as FUNCTION_DECL. If the member template is passed as a
592 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
593 from the declaration. If the function is not a function template, it
595 It returns the original declaration for the function, NULL_TREE if
596 no declaration was found, error_mark_node if an error was emitted. */
599 check_classfn (tree ctype, tree function, tree template_parms)
605 if (DECL_USE_TEMPLATE (function)
606 && !(TREE_CODE (function) == TEMPLATE_DECL
607 && DECL_TEMPLATE_SPECIALIZATION (function))
608 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
609 /* Since this is a specialization of a member template,
610 we're not going to find the declaration in the class.
613 struct S { template <typename T> void f(T); };
614 template <> void S::f(int);
616 we're not going to find `S::f(int)', but there's no
617 reason we should, either. We let our callers know we didn't
618 find the method, but we don't complain. */
621 /* Basic sanity check: for a template function, the template parameters
622 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
623 if (TREE_CODE (function) == TEMPLATE_DECL)
626 && !comp_template_parms (template_parms,
627 DECL_TEMPLATE_PARMS (function)))
629 error ("template parameter lists provided don%'t match the "
630 "template parameters of %qD", function);
631 return error_mark_node;
633 template_parms = DECL_TEMPLATE_PARMS (function);
636 /* OK, is this a definition of a member template? */
637 is_template = (template_parms != NULL_TREE);
639 /* We must enter the scope here, because conversion operators are
640 named by target type, and type equivalence relies on typenames
641 resolving within the scope of CTYPE. */
642 pushed_scope = push_scope (ctype);
643 ix = class_method_index_for_fn (complete_type (ctype), function);
646 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
647 tree fndecls, fndecl = 0;
649 const char *format = NULL;
651 for (fndecls = VEC_index (tree, methods, ix);
652 fndecls; fndecls = OVL_NEXT (fndecls))
656 fndecl = OVL_CURRENT (fndecls);
657 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
658 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
660 /* We cannot simply call decls_match because this doesn't
661 work for static member functions that are pretending to
662 be methods, and because the name may have been changed by
665 /* Get rid of the this parameter on functions that become
667 if (DECL_STATIC_FUNCTION_P (fndecl)
668 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
669 p1 = TREE_CHAIN (p1);
671 /* A member template definition only matches a member template
673 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
676 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
677 TREE_TYPE (TREE_TYPE (fndecl)))
678 && compparms (p1, p2)
680 || comp_template_parms (template_parms,
681 DECL_TEMPLATE_PARMS (fndecl)))
682 && (DECL_TEMPLATE_SPECIALIZATION (function)
683 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
684 && (!DECL_TEMPLATE_SPECIALIZATION (function)
685 || (DECL_TI_TEMPLATE (function)
686 == DECL_TI_TEMPLATE (fndecl))))
692 pop_scope (pushed_scope);
693 return OVL_CURRENT (fndecls);
696 error_at (DECL_SOURCE_LOCATION (function),
697 "prototype for %q#D does not match any in class %qT",
699 is_conv_op = DECL_CONV_FN_P (fndecl);
702 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
703 fndecls = VEC_index (tree, methods, ix);
706 fndecl = OVL_CURRENT (fndecls);
707 fndecls = OVL_NEXT (fndecls);
709 if (!fndecls && is_conv_op)
711 if (VEC_length (tree, methods) > (size_t) ++ix)
713 fndecls = VEC_index (tree, methods, ix);
714 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
726 format = N_("candidates are: %+#D");
728 format = N_("candidate is: %+#D");
729 error (format, fndecl);
732 else if (!COMPLETE_TYPE_P (ctype))
733 cxx_incomplete_type_error (function, ctype);
735 error ("no %q#D member function declared in class %qT",
739 pop_scope (pushed_scope);
740 return error_mark_node;
743 /* DECL is a function with vague linkage. Remember it so that at the
744 end of the translation unit we can decide whether or not to emit
748 note_vague_linkage_fn (tree decl)
750 DECL_DEFER_OUTPUT (decl) = 1;
751 VEC_safe_push (tree, gc, deferred_fns, decl);
754 /* We have just processed the DECL, which is a static data member.
755 The other parameters are as for cp_finish_decl. */
758 finish_static_data_member_decl (tree decl,
759 tree init, bool init_const_expr_p,
763 DECL_CONTEXT (decl) = current_class_type;
765 /* We cannot call pushdecl here, because that would fill in the
766 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
767 the right thing, namely, to put this decl out straight away. */
769 if (! processing_template_decl)
770 VEC_safe_push (tree, gc, pending_statics, decl);
772 if (LOCAL_CLASS_P (current_class_type))
773 permerror (input_location, "local class %q#T shall not have static data member %q#D",
774 current_class_type, decl);
776 DECL_IN_AGGR_P (decl) = 1;
778 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
779 && TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
780 SET_VAR_HAD_UNKNOWN_BOUND (decl);
782 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
785 /* DECLARATOR and DECLSPECS correspond to a class member. The other
786 parameters are as for cp_finish_decl. Return the DECL for the
787 class member declared. */
790 grokfield (const cp_declarator *declarator,
791 cp_decl_specifier_seq *declspecs,
792 tree init, bool init_const_expr_p,
797 const char *asmspec = 0;
798 int flags = LOOKUP_ONLYCONVERTING;
802 && TREE_CODE (init) == TREE_LIST
803 && TREE_VALUE (init) == error_mark_node
804 && TREE_CHAIN (init) == NULL_TREE)
807 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
808 if (! value || error_operand_p (value))
809 /* friend or constructor went bad. */
810 return error_mark_node;
812 if (TREE_CODE (value) == TYPE_DECL && init)
814 error ("typedef %qD is initialized (use decltype instead)", value);
818 /* Pass friendly classes back. */
819 if (value == void_type_node)
822 /* Pass friend decls back. */
823 if ((TREE_CODE (value) == FUNCTION_DECL
824 || TREE_CODE (value) == TEMPLATE_DECL)
825 && DECL_CONTEXT (value) != current_class_type)
828 name = DECL_NAME (value);
830 if (name != NULL_TREE)
832 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
834 error ("explicit template argument list not allowed");
835 return error_mark_node;
838 if (IDENTIFIER_POINTER (name)[0] == '_'
839 && ! strcmp (IDENTIFIER_POINTER (name), "_vptr"))
840 error ("member %qD conflicts with virtual function table field name",
844 /* Stash away type declarations. */
845 if (TREE_CODE (value) == TYPE_DECL)
847 DECL_NONLOCAL (value) = 1;
848 DECL_CONTEXT (value) = current_class_type;
850 if (processing_template_decl)
851 value = push_template_decl (value);
857 /* If this is a typedef that names the class for linkage purposes
858 (7.1.3p8), apply any attributes directly to the type. */
859 if (TAGGED_TYPE_P (TREE_TYPE (value))
860 && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
861 attrflags = ATTR_FLAG_TYPE_IN_PLACE;
863 cplus_decl_attributes (&value, attrlist, attrflags);
866 if (declspecs->specs[(int)ds_typedef]
867 && TREE_TYPE (value) != error_mark_node
868 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
869 set_underlying_type (value);
874 if (DECL_IN_AGGR_P (value))
876 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
877 return void_type_node;
880 if (asmspec_tree && asmspec_tree != error_mark_node)
881 asmspec = TREE_STRING_POINTER (asmspec_tree);
885 if (TREE_CODE (value) == FUNCTION_DECL)
887 /* Initializers for functions are rejected early in the parser.
888 If we get here, it must be a pure specifier for a method. */
889 if (init == ridpointers[(int)RID_DELETE])
891 DECL_DELETED_FN (value) = 1;
892 DECL_DECLARED_INLINE_P (value) = 1;
893 DECL_INITIAL (value) = error_mark_node;
895 else if (init == ridpointers[(int)RID_DEFAULT])
897 if (defaultable_fn_check (value))
899 DECL_DEFAULTED_FN (value) = 1;
900 DECL_INITIALIZED_IN_CLASS_P (value) = 1;
901 DECL_DECLARED_INLINE_P (value) = 1;
904 else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
906 if (integer_zerop (init))
907 DECL_PURE_VIRTUAL_P (value) = 1;
908 else if (error_operand_p (init))
909 ; /* An error has already been reported. */
911 error ("invalid initializer for member function %qD",
916 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
917 error ("initializer specified for static member function %qD",
921 else if (pedantic && TREE_CODE (value) != VAR_DECL)
922 /* Already complained in grokdeclarator. */
924 else if (!processing_template_decl)
926 if (TREE_CODE (init) == CONSTRUCTOR)
927 init = digest_init (TREE_TYPE (value), init);
928 init = maybe_constant_init (init);
930 if (init != error_mark_node && !TREE_CONSTANT (init))
932 /* We can allow references to things that are effectively
933 static, since references are initialized with the
935 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
936 || (TREE_STATIC (init) == 0
937 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
939 error ("field initializer is not constant");
940 init = error_mark_node;
946 if (processing_template_decl
947 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
949 value = push_template_decl (value);
950 if (error_operand_p (value))
951 return error_mark_node;
955 cplus_decl_attributes (&value, attrlist, 0);
957 switch (TREE_CODE (value))
960 finish_static_data_member_decl (value, init, init_const_expr_p,
961 asmspec_tree, flags);
966 error ("%<asm%> specifiers are not permitted on non-static data members");
967 if (DECL_INITIAL (value) == error_mark_node)
968 init = error_mark_node;
969 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
971 DECL_INITIAL (value) = init;
972 DECL_IN_AGGR_P (value) = 1;
977 set_user_assembler_name (value, asmspec);
979 cp_finish_decl (value,
981 /*init_const_expr_p=*/false,
982 asmspec_tree, flags);
984 /* Pass friends back this way. */
985 if (DECL_FRIEND_P (value))
986 return void_type_node;
988 DECL_IN_AGGR_P (value) = 1;
997 /* Like `grokfield', but for bitfields.
998 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1001 grokbitfield (const cp_declarator *declarator,
1002 cp_decl_specifier_seq *declspecs, tree width,
1005 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist);
1007 if (value == error_mark_node)
1008 return NULL_TREE; /* friends went bad. */
1010 /* Pass friendly classes back. */
1011 if (TREE_CODE (value) == VOID_TYPE)
1012 return void_type_node;
1014 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))
1015 && (POINTER_TYPE_P (value)
1016 || !dependent_type_p (TREE_TYPE (value))))
1018 error ("bit-field %qD with non-integral type", value);
1019 return error_mark_node;
1022 if (TREE_CODE (value) == TYPE_DECL)
1024 error ("cannot declare %qD to be a bit-field type", value);
1028 /* Usually, finish_struct_1 catches bitfields with invalid types.
1029 But, in the case of bitfields with function type, we confuse
1030 ourselves into thinking they are member functions, so we must
1032 if (TREE_CODE (value) == FUNCTION_DECL)
1034 error ("cannot declare bit-field %qD with function type",
1039 if (DECL_IN_AGGR_P (value))
1041 error ("%qD is already defined in the class %qT", value,
1042 DECL_CONTEXT (value));
1043 return void_type_node;
1046 if (TREE_STATIC (value))
1048 error ("static member %qD cannot be a bit-field", value);
1051 cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0);
1053 if (width != error_mark_node)
1055 /* The width must be an integer type. */
1056 if (!type_dependent_expression_p (width)
1057 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width)))
1058 error ("width of bit-field %qD has non-integral type %qT", value,
1060 DECL_INITIAL (value) = width;
1061 SET_DECL_C_BIT_FIELD (value);
1064 DECL_IN_AGGR_P (value) = 1;
1067 cplus_decl_attributes (&value, attrlist, /*flags=*/0);
1073 /* Returns true iff ATTR is an attribute which needs to be applied at
1074 instantiation time rather than template definition time. */
1077 is_late_template_attribute (tree attr, tree decl)
1079 tree name = TREE_PURPOSE (attr);
1080 tree args = TREE_VALUE (attr);
1081 const struct attribute_spec *spec = lookup_attribute_spec (name);
1085 /* Unknown attribute. */
1088 /* Attribute weak handling wants to write out assembly right away. */
1089 if (is_attribute_p ("weak", name))
1092 /* If any of the arguments are dependent expressions, we can't evaluate
1093 the attribute until instantiation time. */
1094 for (arg = args; arg; arg = TREE_CHAIN (arg))
1096 tree t = TREE_VALUE (arg);
1098 /* If the first attribute argument is an identifier, only consider
1099 second and following arguments. Attributes like mode, format,
1100 cleanup and several target specific attributes aren't late
1101 just because they have an IDENTIFIER_NODE as first argument. */
1102 if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE)
1105 if (value_dependent_expression_p (t)
1106 || type_dependent_expression_p (t))
1110 if (TREE_CODE (decl) == TYPE_DECL
1112 || spec->type_required)
1114 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1116 /* We can't apply any attributes to a completely unknown type until
1117 instantiation time. */
1118 enum tree_code code = TREE_CODE (type);
1119 if (code == TEMPLATE_TYPE_PARM
1120 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1121 || code == TYPENAME_TYPE)
1123 /* Also defer most attributes on dependent types. This is not
1124 necessary in all cases, but is the better default. */
1125 else if (dependent_type_p (type)
1126 /* But attribute visibility specifically works on
1128 && !is_attribute_p ("visibility", name))
1137 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1138 applied at instantiation time and return them. If IS_DEPENDENT is true,
1139 the declaration itself is dependent, so all attributes should be applied
1140 at instantiation time. */
1143 splice_template_attributes (tree *attr_p, tree decl)
1146 tree late_attrs = NULL_TREE;
1147 tree *q = &late_attrs;
1154 if (is_late_template_attribute (*p, decl))
1156 ATTR_IS_DEPENDENT (*p) = 1;
1158 *p = TREE_CHAIN (*p);
1159 q = &TREE_CHAIN (*q);
1163 p = &TREE_CHAIN (*p);
1169 /* Remove any late attributes from the list in ATTR_P and attach them to
1173 save_template_attributes (tree *attr_p, tree *decl_p)
1175 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1177 tree old_attrs = NULL_TREE;
1182 if (DECL_P (*decl_p))
1183 q = &DECL_ATTRIBUTES (*decl_p);
1185 q = &TYPE_ATTRIBUTES (*decl_p);
1189 /* Place the late attributes at the beginning of the attribute
1191 TREE_CHAIN (tree_last (late_attrs)) = *q;
1194 if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
1196 /* We've added new attributes directly to the main variant, so
1197 now we need to update all of the other variants to include
1198 these new attributes. */
1200 for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
1201 variant = TYPE_NEXT_VARIANT (variant))
1203 gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
1204 TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
1209 /* Like reconstruct_complex_type, but handle also template trees. */
1212 cp_reconstruct_complex_type (tree type, tree bottom)
1216 if (TREE_CODE (type) == POINTER_TYPE)
1218 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1219 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
1220 TYPE_REF_CAN_ALIAS_ALL (type));
1222 else if (TREE_CODE (type) == REFERENCE_TYPE)
1224 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1225 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
1226 TYPE_REF_CAN_ALIAS_ALL (type));
1228 else if (TREE_CODE (type) == ARRAY_TYPE)
1230 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1231 outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
1232 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1233 element type qualification will be handled by the recursive
1234 cp_reconstruct_complex_type call and cp_build_qualified_type
1235 for ARRAY_TYPEs changes the element type. */
1238 else if (TREE_CODE (type) == FUNCTION_TYPE)
1240 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1241 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
1242 outer = apply_memfn_quals (outer, type_memfn_quals (type));
1244 else if (TREE_CODE (type) == METHOD_TYPE)
1246 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1247 /* The build_method_type_directly() routine prepends 'this' to argument list,
1248 so we must compensate by getting rid of it. */
1250 = build_method_type_directly
1251 (class_of_this_parm (type), inner,
1252 TREE_CHAIN (TYPE_ARG_TYPES (type)));
1254 else if (TREE_CODE (type) == OFFSET_TYPE)
1256 inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
1257 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
1262 if (TYPE_ATTRIBUTES (type))
1263 outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
1264 return cp_build_qualified_type (outer, cp_type_quals (type));
1267 /* Replaces any constexpr expression that may be into the attributes
1268 arguments with their reduced value. */
1271 cp_check_const_attributes (tree attributes)
1274 for (attr = attributes; attr; attr = TREE_CHAIN (attr))
1277 for (arg = TREE_VALUE (attr); arg; arg = TREE_CHAIN (arg))
1279 tree expr = TREE_VALUE (arg);
1281 TREE_VALUE (arg) = maybe_constant_value (expr);
1286 /* Like decl_attributes, but handle C++ complexity. */
1289 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1291 if (*decl == NULL_TREE || *decl == void_type_node
1292 || *decl == error_mark_node
1293 || attributes == NULL_TREE)
1296 if (processing_template_decl)
1298 if (check_for_bare_parameter_packs (attributes))
1301 save_template_attributes (&attributes, decl);
1302 if (attributes == NULL_TREE)
1306 cp_check_const_attributes (attributes);
1308 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1309 decl = &DECL_TEMPLATE_RESULT (*decl);
1311 decl_attributes (decl, attributes, flags);
1313 if (TREE_CODE (*decl) == TYPE_DECL)
1314 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1317 /* Walks through the namespace- or function-scope anonymous union
1318 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1319 Returns one of the fields for use in the mangled name. */
1322 build_anon_union_vars (tree type, tree object)
1324 tree main_decl = NULL_TREE;
1327 /* Rather than write the code to handle the non-union case,
1328 just give an error. */
1329 if (TREE_CODE (type) != UNION_TYPE)
1330 error ("anonymous struct not inside named type");
1332 for (field = TYPE_FIELDS (type);
1334 field = DECL_CHAIN (field))
1339 if (DECL_ARTIFICIAL (field))
1341 if (TREE_CODE (field) != FIELD_DECL)
1343 permerror (input_location, "%q+#D invalid; an anonymous union can only "
1344 "have non-static data members", field);
1348 if (TREE_PRIVATE (field))
1349 permerror (input_location, "private member %q+#D in anonymous union", field);
1350 else if (TREE_PROTECTED (field))
1351 permerror (input_location, "protected member %q+#D in anonymous union", field);
1353 if (processing_template_decl)
1354 ref = build_min_nt (COMPONENT_REF, object,
1355 DECL_NAME (field), NULL_TREE);
1357 ref = build_class_member_access_expr (object, field, NULL_TREE,
1358 false, tf_warning_or_error);
1360 if (DECL_NAME (field))
1364 decl = build_decl (input_location,
1365 VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1366 DECL_ANON_UNION_VAR_P (decl) = 1;
1367 DECL_ARTIFICIAL (decl) = 1;
1369 base = get_base_address (object);
1370 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1371 TREE_STATIC (decl) = TREE_STATIC (base);
1372 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1374 SET_DECL_VALUE_EXPR (decl, ref);
1375 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1377 decl = pushdecl (decl);
1379 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1380 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1384 if (main_decl == NULL_TREE)
1391 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1392 anonymous union, then all members must be laid out together. PUBLIC_P
1393 is nonzero if this union is not declared static. */
1396 finish_anon_union (tree anon_union_decl)
1402 if (anon_union_decl == error_mark_node)
1405 type = TREE_TYPE (anon_union_decl);
1406 public_p = TREE_PUBLIC (anon_union_decl);
1408 /* The VAR_DECL's context is the same as the TYPE's context. */
1409 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1411 if (TYPE_FIELDS (type) == NULL_TREE)
1416 error ("namespace-scope anonymous aggregates must be static");
1420 main_decl = build_anon_union_vars (type, anon_union_decl);
1421 if (main_decl == error_mark_node)
1423 if (main_decl == NULL_TREE)
1425 warning (0, "anonymous union with no members");
1429 if (!processing_template_decl)
1431 /* Use main_decl to set the mangled name. */
1432 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1433 maybe_commonize_var (anon_union_decl);
1434 if (TREE_STATIC (anon_union_decl) || DECL_EXTERNAL (anon_union_decl))
1435 mangle_decl (anon_union_decl);
1436 DECL_NAME (anon_union_decl) = NULL_TREE;
1439 pushdecl (anon_union_decl);
1440 if (building_stmt_tree ()
1441 && at_function_scope_p ())
1442 add_decl_expr (anon_union_decl);
1443 else if (!processing_template_decl)
1444 rest_of_decl_compilation (anon_union_decl,
1445 toplevel_bindings_p (), at_eof);
1448 /* Auxiliary functions to make type signatures for
1449 `operator new' and `operator delete' correspond to
1450 what compiler will be expecting. */
1453 coerce_new_type (tree type)
1456 tree args = TYPE_ARG_TYPES (type);
1458 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1460 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1463 error ("%<operator new%> must return type %qT", ptr_type_node);
1466 if (args && args != void_list_node)
1468 if (TREE_PURPOSE (args))
1470 /* [basic.stc.dynamic.allocation]
1472 The first parameter shall not have an associated default
1474 error ("the first parameter of %<operator new%> cannot "
1475 "have a default argument");
1476 /* Throw away the default argument. */
1477 TREE_PURPOSE (args) = NULL_TREE;
1480 if (!same_type_p (TREE_VALUE (args), size_type_node))
1483 args = TREE_CHAIN (args);
1490 permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) "
1491 "as first parameter", size_type_node);
1496 args = tree_cons (NULL_TREE, size_type_node, args);
1499 type = build_exception_variant
1500 (build_function_type (ptr_type_node, args),
1501 TYPE_RAISES_EXCEPTIONS (type));
1509 coerce_delete_type (tree type)
1512 tree args = TYPE_ARG_TYPES (type);
1514 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1516 if (!same_type_p (TREE_TYPE (type), void_type_node))
1519 error ("%<operator delete%> must return type %qT", void_type_node);
1522 if (!args || args == void_list_node
1523 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1526 if (args && args != void_list_node)
1527 args = TREE_CHAIN (args);
1528 error ("%<operator delete%> takes type %qT as first parameter",
1534 args = tree_cons (NULL_TREE, ptr_type_node, args);
1537 type = build_exception_variant
1538 (build_function_type (void_type_node, args),
1539 TYPE_RAISES_EXCEPTIONS (type));
1547 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1548 and mark them as needed. */
1551 mark_vtable_entries (tree decl)
1554 unsigned HOST_WIDE_INT idx;
1556 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1561 STRIP_NOPS (fnaddr);
1563 if (TREE_CODE (fnaddr) != ADDR_EXPR
1564 && TREE_CODE (fnaddr) != FDESC_EXPR)
1565 /* This entry is an offset: a virtual base class offset, a
1566 virtual call offset, an RTTI offset, etc. */
1569 fn = TREE_OPERAND (fnaddr, 0);
1570 TREE_ADDRESSABLE (fn) = 1;
1571 /* When we don't have vcall offsets, we output thunks whenever
1572 we output the vtables that contain them. With vcall offsets,
1573 we know all the thunks we'll need when we emit a virtual
1574 function, so we emit the thunks there instead. */
1575 if (DECL_THUNK_P (fn))
1576 use_thunk (fn, /*emit_p=*/0);
1581 /* Set DECL up to have the closest approximation of "initialized common"
1582 linkage available. */
1585 comdat_linkage (tree decl)
1588 make_decl_one_only (decl, cxx_comdat_group (decl));
1589 else if (TREE_CODE (decl) == FUNCTION_DECL
1590 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1591 /* We can just emit function and compiler-generated variables
1592 statically; having multiple copies is (for the most part) only
1595 There are two correctness issues, however: the address of a
1596 template instantiation with external linkage should be the
1597 same, independent of what translation unit asks for the
1598 address, and this will not hold when we emit multiple copies of
1599 the function. However, there's little else we can do.
1601 Also, by default, the typeinfo implementation assumes that
1602 there will be only one copy of the string used as the name for
1603 each type. Therefore, if weak symbols are unavailable, the
1604 run-time library should perform a more conservative check; it
1605 should perform a string comparison, rather than an address
1607 TREE_PUBLIC (decl) = 0;
1610 /* Static data member template instantiations, however, cannot
1611 have multiple copies. */
1612 if (DECL_INITIAL (decl) == 0
1613 || DECL_INITIAL (decl) == error_mark_node)
1614 DECL_COMMON (decl) = 1;
1615 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1617 DECL_COMMON (decl) = 1;
1618 DECL_INITIAL (decl) = error_mark_node;
1620 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1622 /* We can't do anything useful; leave vars for explicit
1624 DECL_EXTERNAL (decl) = 1;
1625 DECL_NOT_REALLY_EXTERN (decl) = 0;
1629 DECL_COMDAT (decl) = 1;
1632 /* For win32 we also want to put explicit instantiations in
1633 linkonce sections, so that they will be merged with implicit
1634 instantiations; otherwise we get duplicate symbol errors.
1635 For Darwin we do not want explicit instantiations to be
1639 maybe_make_one_only (tree decl)
1641 /* We used to say that this was not necessary on targets that support weak
1642 symbols, because the implicit instantiations will defer to the explicit
1643 one. However, that's not actually the case in SVR4; a strong definition
1644 after a weak one is an error. Also, not making explicit
1645 instantiations one_only means that we can end up with two copies of
1646 some template instantiations. */
1650 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1651 we can get away with not emitting them if they aren't used. We need
1652 to for variables so that cp_finish_decl will update their linkage,
1653 because their DECL_INITIAL may not have been set properly yet. */
1655 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1656 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1657 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1659 make_decl_one_only (decl, cxx_comdat_group (decl));
1661 if (TREE_CODE (decl) == VAR_DECL)
1663 DECL_COMDAT (decl) = 1;
1664 /* Mark it needed so we don't forget to emit it. */
1665 mark_decl_referenced (decl);
1670 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1671 This predicate will give the right answer during parsing of the
1672 function, which other tests may not. */
1675 vague_linkage_p (tree decl)
1677 /* Unfortunately, import_export_decl has not always been called
1678 before the function is processed, so we cannot simply check
1680 return (DECL_COMDAT (decl)
1681 || (((TREE_CODE (decl) == FUNCTION_DECL
1682 && DECL_DECLARED_INLINE_P (decl))
1683 || (DECL_LANG_SPECIFIC (decl)
1684 && DECL_TEMPLATE_INSTANTIATION (decl)))
1685 && TREE_PUBLIC (decl)));
1688 /* Determine whether or not we want to specifically import or export CTYPE,
1689 using various heuristics. */
1692 import_export_class (tree ctype)
1694 /* -1 for imported, 1 for exported. */
1695 int import_export = 0;
1697 /* It only makes sense to call this function at EOF. The reason is
1698 that this function looks at whether or not the first non-inline
1699 non-abstract virtual member function has been defined in this
1700 translation unit. But, we can't possibly know that until we've
1701 seen the entire translation unit. */
1702 gcc_assert (at_eof);
1704 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1707 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1708 we will have CLASSTYPE_INTERFACE_ONLY set but not
1709 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1710 heuristic because someone will supply a #pragma implementation
1711 elsewhere, and deducing it here would produce a conflict. */
1712 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1715 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1717 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1719 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1720 && !flag_implicit_templates)
1721 /* For a template class, without -fimplicit-templates, check the
1722 repository. If the virtual table is assigned to this
1723 translation unit, then export the class; otherwise, import
1725 import_export = repo_export_class_p (ctype) ? 1 : -1;
1726 else if (TYPE_POLYMORPHIC_P (ctype))
1728 /* The ABI specifies that the virtual table and associated
1729 information are emitted with the key method, if any. */
1730 tree method = CLASSTYPE_KEY_METHOD (ctype);
1731 /* If weak symbol support is not available, then we must be
1732 careful not to emit the vtable when the key function is
1733 inline. An inline function can be defined in multiple
1734 translation units. If we were to emit the vtable in each
1735 translation unit containing a definition, we would get
1736 multiple definition errors at link-time. */
1737 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1738 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1741 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1742 a definition anywhere else. */
1743 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1746 /* Allow back ends the chance to overrule the decision. */
1747 if (targetm.cxx.import_export_class)
1748 import_export = targetm.cxx.import_export_class (ctype, import_export);
1752 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1753 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1757 /* Return true if VAR has already been provided to the back end; in that
1758 case VAR should not be modified further by the front end. */
1760 var_finalized_p (tree var)
1762 return varpool_node (var)->finalized;
1765 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1766 must be emitted in this translation unit. Mark it as such. */
1769 mark_needed (tree decl)
1771 /* It's possible that we no longer need to set
1772 TREE_SYMBOL_REFERENCED here directly, but doing so is
1774 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1775 mark_decl_referenced (decl);
1778 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1779 returns true if a definition of this entity should be provided in
1780 this object file. Callers use this function to determine whether
1781 or not to let the back end know that a definition of DECL is
1782 available in this translation unit. */
1785 decl_needed_p (tree decl)
1787 gcc_assert (TREE_CODE (decl) == VAR_DECL
1788 || TREE_CODE (decl) == FUNCTION_DECL);
1789 /* This function should only be called at the end of the translation
1790 unit. We cannot be sure of whether or not something will be
1791 COMDAT until that point. */
1792 gcc_assert (at_eof);
1794 /* All entities with external linkage that are not COMDAT should be
1795 emitted; they may be referred to from other object files. */
1796 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1798 /* If this entity was used, let the back end see it; it will decide
1799 whether or not to emit it into the object file. */
1800 if (TREE_USED (decl)
1801 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1802 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1804 /* Functions marked "dllexport" must be emitted so that they are
1805 visible to other DLLs. */
1806 if (flag_keep_inline_dllexport
1807 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
1809 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1810 reference to DECL might cause it to be emitted later. */
1814 /* If necessary, write out the vtables for the dynamic class CTYPE.
1815 Returns true if any vtables were emitted. */
1818 maybe_emit_vtables (tree ctype)
1823 struct varpool_node *current = NULL, *last = NULL, *first = NULL;
1825 /* If the vtables for this class have already been emitted there is
1826 nothing more to do. */
1827 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1828 if (var_finalized_p (primary_vtbl))
1830 /* Ignore dummy vtables made by get_vtable_decl. */
1831 if (TREE_TYPE (primary_vtbl) == void_type_node)
1834 /* On some targets, we cannot determine the key method until the end
1835 of the translation unit -- which is when this function is
1837 if (!targetm.cxx.key_method_may_be_inline ())
1838 determine_key_method (ctype);
1840 /* See if any of the vtables are needed. */
1841 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1843 import_export_decl (vtbl);
1844 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1849 /* If the references to this class' vtables are optimized away,
1850 still emit the appropriate debugging information. See
1852 if (DECL_COMDAT (primary_vtbl)
1853 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1854 note_debug_info_needed (ctype);
1858 /* The ABI requires that we emit all of the vtables if we emit any
1860 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = DECL_CHAIN (vtbl))
1862 /* Mark entities references from the virtual table as used. */
1863 mark_vtable_entries (vtbl);
1865 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1867 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL);
1869 /* It had better be all done at compile-time. */
1874 DECL_EXTERNAL (vtbl) = 0;
1875 rest_of_decl_compilation (vtbl, 1, 1);
1877 /* Because we're only doing syntax-checking, we'll never end up
1878 actually marking the variable as written. */
1879 if (flag_syntax_only)
1880 TREE_ASM_WRITTEN (vtbl) = 1;
1881 else if (DECL_COMDAT (vtbl))
1883 current = varpool_node (vtbl);
1885 last->same_comdat_group = current;
1893 last->same_comdat_group = first;
1895 /* Since we're writing out the vtable here, also write the debug
1897 note_debug_info_needed (ctype);
1902 /* A special return value from type_visibility meaning internal
1905 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1907 /* walk_tree helper function for type_visibility. */
1910 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1912 int *vis_p = (int *)data;
1917 else if (CLASS_TYPE_P (*tp))
1919 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1921 *vis_p = VISIBILITY_ANON;
1924 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1925 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1930 /* Returns the visibility of TYPE, which is the minimum visibility of its
1934 type_visibility (tree type)
1936 int vis = VISIBILITY_DEFAULT;
1937 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1941 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1942 specified (or if VISIBILITY is static). */
1945 constrain_visibility (tree decl, int visibility)
1947 if (visibility == VISIBILITY_ANON)
1949 /* extern "C" declarations aren't affected by the anonymous
1951 if (!DECL_EXTERN_C_P (decl))
1953 TREE_PUBLIC (decl) = 0;
1954 DECL_WEAK (decl) = 0;
1955 DECL_COMMON (decl) = 0;
1956 DECL_COMDAT_GROUP (decl) = NULL_TREE;
1957 DECL_INTERFACE_KNOWN (decl) = 1;
1958 if (DECL_LANG_SPECIFIC (decl))
1959 DECL_NOT_REALLY_EXTERN (decl) = 1;
1962 else if (visibility > DECL_VISIBILITY (decl)
1963 && !DECL_VISIBILITY_SPECIFIED (decl))
1965 DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
1971 /* Constrain the visibility of DECL based on the visibility of its template
1975 constrain_visibility_for_template (tree decl, tree targs)
1977 /* If this is a template instantiation, check the innermost
1978 template args for visibility constraints. The outer template
1979 args are covered by the class check. */
1980 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1982 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1986 tree arg = TREE_VEC_ELT (args, i-1);
1988 vis = type_visibility (arg);
1989 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1992 if (TREE_CODE (arg) == ADDR_EXPR)
1993 arg = TREE_OPERAND (arg, 0);
1994 if (TREE_CODE (arg) == VAR_DECL
1995 || TREE_CODE (arg) == FUNCTION_DECL)
1997 if (! TREE_PUBLIC (arg))
1998 vis = VISIBILITY_ANON;
2000 vis = DECL_VISIBILITY (arg);
2004 constrain_visibility (decl, vis);
2008 /* Like c_determine_visibility, but with additional C++-specific
2011 Function-scope entities can rely on the function's visibility because
2012 it is set in start_preparsed_function.
2014 Class-scope entities cannot rely on the class's visibility until the end
2015 of the enclosing class definition.
2017 Note that because namespaces have multiple independent definitions,
2018 namespace visibility is handled elsewhere using the #pragma visibility
2019 machinery rather than by decorating the namespace declaration.
2021 The goal is for constraints from the type to give a diagnostic, and
2022 other constraints to be applied silently. */
2025 determine_visibility (tree decl)
2027 tree class_type = NULL_TREE;
2029 bool orig_visibility_specified;
2030 enum symbol_visibility orig_visibility;
2032 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2034 /* Only relevant for names with external linkage. */
2035 if (!TREE_PUBLIC (decl))
2038 /* Cloned constructors and destructors get the same visibility as
2039 the underlying function. That should be set up in
2040 maybe_clone_body. */
2041 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
2043 orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
2044 orig_visibility = DECL_VISIBILITY (decl);
2046 if (TREE_CODE (decl) == TYPE_DECL)
2048 if (CLASS_TYPE_P (TREE_TYPE (decl)))
2049 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
2050 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
2055 else if (DECL_LANG_SPECIFIC (decl))
2056 use_template = DECL_USE_TEMPLATE (decl);
2060 /* If DECL is a member of a class, visibility specifiers on the
2061 class can influence the visibility of the DECL. */
2062 if (DECL_CLASS_SCOPE_P (decl))
2063 class_type = DECL_CONTEXT (decl);
2066 /* Not a class member. */
2068 /* Virtual tables have DECL_CONTEXT set to their associated class,
2069 so they are automatically handled above. */
2070 gcc_assert (TREE_CODE (decl) != VAR_DECL
2071 || !DECL_VTABLE_OR_VTT_P (decl));
2073 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
2075 /* Local statics and classes get the visibility of their
2076 containing function by default, except that
2077 -fvisibility-inlines-hidden doesn't affect them. */
2078 tree fn = DECL_CONTEXT (decl);
2079 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
2081 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
2082 DECL_VISIBILITY_SPECIFIED (decl) =
2083 DECL_VISIBILITY_SPECIFIED (fn);
2086 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
2088 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2089 but have no TEMPLATE_INFO, so don't try to check it. */
2092 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
2093 && flag_visibility_ms_compat)
2095 /* Under -fvisibility-ms-compat, types are visible by default,
2096 even though their contents aren't. */
2097 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
2098 int underlying_vis = type_visibility (underlying_type);
2099 if (underlying_vis == VISIBILITY_ANON
2100 || (CLASS_TYPE_P (underlying_type)
2101 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type)))
2102 constrain_visibility (decl, underlying_vis);
2104 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
2106 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2108 /* tinfo visibility is based on the type it's for. */
2109 constrain_visibility
2110 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
2112 /* Give the target a chance to override the visibility associated
2114 if (TREE_PUBLIC (decl)
2115 && !DECL_REALLY_EXTERN (decl)
2116 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
2117 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
2118 targetm.cxx.determine_class_data_visibility (decl);
2120 else if (use_template)
2121 /* Template instantiations and specializations get visibility based
2122 on their template unless they override it with an attribute. */;
2123 else if (! DECL_VISIBILITY_SPECIFIED (decl))
2125 /* Set default visibility to whatever the user supplied with
2126 #pragma GCC visibility or a namespace visibility attribute. */
2127 DECL_VISIBILITY (decl) = default_visibility;
2128 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
2134 /* If the specialization doesn't specify visibility, use the
2135 visibility from the template. */
2136 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
2137 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2138 : DECL_TEMPLATE_INFO (decl));
2139 tree args = TI_ARGS (tinfo);
2141 if (args != error_mark_node)
2143 int depth = TMPL_ARGS_DEPTH (args);
2144 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
2146 if (!DECL_VISIBILITY_SPECIFIED (decl))
2148 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
2149 DECL_VISIBILITY_SPECIFIED (decl)
2150 = DECL_VISIBILITY_SPECIFIED (pattern);
2153 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
2154 if (args && depth > template_class_depth (class_type))
2155 /* Limit visibility based on its template arguments. */
2156 constrain_visibility_for_template (decl, args);
2161 determine_visibility_from_class (decl, class_type);
2163 if (decl_anon_ns_mem_p (decl))
2164 /* Names in an anonymous namespace get internal linkage.
2165 This might change once we implement export. */
2166 constrain_visibility (decl, VISIBILITY_ANON);
2167 else if (TREE_CODE (decl) != TYPE_DECL)
2169 /* Propagate anonymity from type to decl. */
2170 int tvis = type_visibility (TREE_TYPE (decl));
2171 if (tvis == VISIBILITY_ANON
2172 || ! DECL_VISIBILITY_SPECIFIED (decl))
2173 constrain_visibility (decl, tvis);
2175 else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
2176 /* DR 757: A type without linkage shall not be used as the type of a
2177 variable or function with linkage, unless
2178 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2179 o the variable or function is not used (3.2 [basic.def.odr]) or is
2180 defined in the same translation unit.
2182 Since non-extern "C" decls need to be defined in the same
2183 translation unit, we can make the type internal. */
2184 constrain_visibility (decl, VISIBILITY_ANON);
2186 /* If visibility changed and DECL already has DECL_RTL, ensure
2187 symbol flags are updated. */
2188 if ((DECL_VISIBILITY (decl) != orig_visibility
2189 || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
2190 && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2191 || TREE_CODE (decl) == FUNCTION_DECL)
2192 && DECL_RTL_SET_P (decl))
2193 make_decl_rtl (decl);
2196 /* By default, static data members and function members receive
2197 the visibility of their containing class. */
2200 determine_visibility_from_class (tree decl, tree class_type)
2202 if (DECL_VISIBILITY_SPECIFIED (decl))
2205 if (visibility_options.inlines_hidden
2206 /* Don't do this for inline templates; specializations might not be
2207 inline, and we don't want them to inherit the hidden
2208 visibility. We'll set it here for all inline instantiations. */
2209 && !processing_template_decl
2210 && TREE_CODE (decl) == FUNCTION_DECL
2211 && DECL_DECLARED_INLINE_P (decl)
2212 && (! DECL_LANG_SPECIFIC (decl)
2213 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
2214 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
2217 /* Default to the class visibility. */
2218 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
2219 DECL_VISIBILITY_SPECIFIED (decl)
2220 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
2223 /* Give the target a chance to override the visibility associated
2225 if (TREE_CODE (decl) == VAR_DECL
2226 && (DECL_TINFO_P (decl)
2227 || (DECL_VTABLE_OR_VTT_P (decl)
2228 /* Construction virtual tables are not exported because
2229 they cannot be referred to from other object files;
2230 their name is not standardized by the ABI. */
2231 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
2232 && TREE_PUBLIC (decl)
2233 && !DECL_REALLY_EXTERN (decl)
2234 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
2235 targetm.cxx.determine_class_data_visibility (decl);
2238 /* Constrain the visibility of a class TYPE based on the visibility of its
2239 field types. Warn if any fields require lesser visibility. */
2242 constrain_class_visibility (tree type)
2248 int vis = type_visibility (type);
2250 if (vis == VISIBILITY_ANON
2251 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
2254 /* Don't warn about visibility if the class has explicit visibility. */
2255 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
2256 vis = VISIBILITY_INTERNAL;
2258 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
2259 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
2261 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
2262 int subvis = type_visibility (ftype);
2264 if (subvis == VISIBILITY_ANON)
2266 if (!in_main_input_context ())
2268 %qT has a field %qD whose type uses the anonymous namespace",
2271 else if (MAYBE_CLASS_TYPE_P (ftype)
2272 && vis < VISIBILITY_HIDDEN
2273 && subvis >= VISIBILITY_HIDDEN)
2274 warning (OPT_Wattributes, "\
2275 %qT declared with greater visibility than the type of its field %qD",
2279 binfo = TYPE_BINFO (type);
2280 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2282 int subvis = type_visibility (TREE_TYPE (t));
2284 if (subvis == VISIBILITY_ANON)
2286 if (!in_main_input_context())
2288 %qT has a base %qT whose type uses the anonymous namespace",
2289 type, TREE_TYPE (t));
2291 else if (vis < VISIBILITY_HIDDEN
2292 && subvis >= VISIBILITY_HIDDEN)
2293 warning (OPT_Wattributes, "\
2294 %qT declared with greater visibility than its base %qT",
2295 type, TREE_TYPE (t));
2299 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2300 for DECL has not already been determined, do so now by setting
2301 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2302 function is called entities with vague linkage whose definitions
2303 are available must have TREE_PUBLIC set.
2305 If this function decides to place DECL in COMDAT, it will set
2306 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2307 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2308 callers defer that decision until it is clear that DECL is actually
2312 import_export_decl (tree decl)
2317 tree class_type = NULL_TREE;
2319 if (DECL_INTERFACE_KNOWN (decl))
2322 /* We cannot determine what linkage to give to an entity with vague
2323 linkage until the end of the file. For example, a virtual table
2324 for a class will be defined if and only if the key method is
2325 defined in this translation unit. As a further example, consider
2326 that when compiling a translation unit that uses PCH file with
2327 "-frepo" it would be incorrect to make decisions about what
2328 entities to emit when building the PCH; those decisions must be
2329 delayed until the repository information has been processed. */
2330 gcc_assert (at_eof);
2331 /* Object file linkage for explicit instantiations is handled in
2332 mark_decl_instantiated. For static variables in functions with
2333 vague linkage, maybe_commonize_var is used.
2335 Therefore, the only declarations that should be provided to this
2336 function are those with external linkage that are:
2338 * implicit instantiations of function templates
2342 * implicit instantiations of static data members of class
2349 Furthermore, all entities that reach this point must have a
2350 definition available in this translation unit.
2352 The following assertions check these conditions. */
2353 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2354 || TREE_CODE (decl) == VAR_DECL);
2355 /* Any code that creates entities with TREE_PUBLIC cleared should
2356 also set DECL_INTERFACE_KNOWN. */
2357 gcc_assert (TREE_PUBLIC (decl));
2358 if (TREE_CODE (decl) == FUNCTION_DECL)
2359 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2360 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2361 || DECL_DECLARED_INLINE_P (decl));
2363 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2364 || DECL_VTABLE_OR_VTT_P (decl)
2365 || DECL_TINFO_P (decl));
2366 /* Check that a definition of DECL is available in this translation
2368 gcc_assert (!DECL_REALLY_EXTERN (decl));
2370 /* Assume that DECL will not have COMDAT linkage. */
2372 /* Assume that DECL will not be imported into this translation
2376 /* See if the repository tells us whether or not to emit DECL in
2377 this translation unit. */
2378 emit_p = repo_emit_p (decl);
2381 else if (emit_p == 1)
2383 /* The repository indicates that this entity should be defined
2384 here. Make sure the back end honors that request. */
2385 if (TREE_CODE (decl) == VAR_DECL)
2387 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2388 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2391 FOR_EACH_CLONE (clone, decl)
2392 mark_needed (clone);
2396 /* Output the definition as an ordinary strong definition. */
2397 DECL_EXTERNAL (decl) = 0;
2398 DECL_INTERFACE_KNOWN (decl) = 1;
2403 /* We have already decided what to do with this DECL; there is no
2404 need to check anything further. */
2406 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2408 class_type = DECL_CONTEXT (decl);
2409 import_export_class (class_type);
2410 if (TYPE_FOR_JAVA (class_type))
2412 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2413 && CLASSTYPE_INTERFACE_ONLY (class_type))
2415 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2416 && !CLASSTYPE_USE_TEMPLATE (class_type)
2417 && CLASSTYPE_KEY_METHOD (class_type)
2418 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2419 /* The ABI requires that all virtual tables be emitted with
2420 COMDAT linkage. However, on systems where COMDAT symbols
2421 don't show up in the table of contents for a static
2422 archive, or on systems without weak symbols (where we
2423 approximate COMDAT linkage by using internal linkage), the
2424 linker will report errors about undefined symbols because
2425 it will not see the virtual table definition. Therefore,
2426 in the case that we know that the virtual table will be
2427 emitted in only one translation unit, we make the virtual
2428 table an ordinary definition with external linkage. */
2429 DECL_EXTERNAL (decl) = 0;
2430 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2432 /* CLASS_TYPE is being exported from this translation unit,
2433 so DECL should be defined here. */
2434 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2435 /* If a class is declared in a header with the "extern
2436 template" extension, then it will not be instantiated,
2437 even in translation units that would normally require
2438 it. Often such classes are explicitly instantiated in
2439 one translation unit. Therefore, the explicit
2440 instantiation must be made visible to other translation
2442 DECL_EXTERNAL (decl) = 0;
2445 /* The generic C++ ABI says that class data is always
2446 COMDAT, even if there is a key function. Some
2447 variants (e.g., the ARM EABI) says that class data
2448 only has COMDAT linkage if the class data might be
2449 emitted in more than one translation unit. When the
2450 key method can be inline and is inline, we still have
2451 to arrange for comdat even though
2452 class_data_always_comdat is false. */
2453 if (!CLASSTYPE_KEY_METHOD (class_type)
2454 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2455 || targetm.cxx.class_data_always_comdat ())
2457 /* The ABI requires COMDAT linkage. Normally, we
2458 only emit COMDAT things when they are needed;
2459 make sure that we realize that this entity is
2466 else if (!flag_implicit_templates
2467 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2472 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2474 tree type = TREE_TYPE (DECL_NAME (decl));
2475 if (CLASS_TYPE_P (type))
2478 import_export_class (type);
2479 if (CLASSTYPE_INTERFACE_KNOWN (type)
2480 && TYPE_POLYMORPHIC_P (type)
2481 && CLASSTYPE_INTERFACE_ONLY (type)
2482 /* If -fno-rtti was specified, then we cannot be sure
2483 that RTTI information will be emitted with the
2484 virtual table of the class, so we must emit it
2485 wherever it is used. */
2490 if (CLASSTYPE_INTERFACE_KNOWN (type)
2491 && !CLASSTYPE_INTERFACE_ONLY (type))
2493 comdat_p = (targetm.cxx.class_data_always_comdat ()
2494 || (CLASSTYPE_KEY_METHOD (type)
2495 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2500 DECL_EXTERNAL (decl) = 0;
2510 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2511 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2513 /* DECL is an implicit instantiation of a function or static
2515 if ((flag_implicit_templates
2516 && !flag_use_repository)
2517 || (flag_implicit_inline_templates
2518 && TREE_CODE (decl) == FUNCTION_DECL
2519 && DECL_DECLARED_INLINE_P (decl)))
2522 /* If we are not implicitly generating templates, then mark
2523 this entity as undefined in this translation unit. */
2526 else if (DECL_FUNCTION_MEMBER_P (decl))
2528 if (!DECL_DECLARED_INLINE_P (decl))
2530 tree ctype = DECL_CONTEXT (decl);
2531 import_export_class (ctype);
2532 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2534 DECL_NOT_REALLY_EXTERN (decl)
2535 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2536 || (DECL_DECLARED_INLINE_P (decl)
2537 && ! flag_implement_inlines
2538 && !DECL_VINDEX (decl)));
2540 if (!DECL_NOT_REALLY_EXTERN (decl))
2541 DECL_EXTERNAL (decl) = 1;
2543 /* Always make artificials weak. */
2544 if (DECL_ARTIFICIAL (decl) && flag_weak)
2547 maybe_make_one_only (decl);
2558 /* If we are importing DECL into this translation unit, mark is
2559 an undefined here. */
2560 DECL_EXTERNAL (decl) = 1;
2561 DECL_NOT_REALLY_EXTERN (decl) = 0;
2565 /* If we decided to put DECL in COMDAT, mark it accordingly at
2567 comdat_linkage (decl);
2570 DECL_INTERFACE_KNOWN (decl) = 1;
2573 /* Return an expression that performs the destruction of DECL, which
2574 must be a VAR_DECL whose type has a non-trivial destructor, or is
2575 an array whose (innermost) elements have a non-trivial destructor. */
2578 build_cleanup (tree decl)
2581 tree type = TREE_TYPE (decl);
2583 /* This function should only be called for declarations that really
2584 require cleanups. */
2585 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2587 /* Treat all objects with destructors as used; the destructor may do
2588 something substantive. */
2591 if (TREE_CODE (type) == ARRAY_TYPE)
2594 temp = build_address (decl);
2595 temp = build_delete (TREE_TYPE (temp), temp,
2596 sfk_complete_destructor,
2597 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0,
2598 tf_warning_or_error);
2602 /* Returns the initialization guard variable for the variable DECL,
2603 which has static storage duration. */
2606 get_guard (tree decl)
2611 sname = mangle_guard_variable (decl);
2612 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2617 /* We use a type that is big enough to contain a mutex as well
2618 as an integer counter. */
2619 guard_type = targetm.cxx.guard_type ();
2620 guard = build_decl (DECL_SOURCE_LOCATION (decl),
2621 VAR_DECL, sname, guard_type);
2623 /* The guard should have the same linkage as what it guards. */
2624 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2625 TREE_STATIC (guard) = TREE_STATIC (decl);
2626 DECL_COMMON (guard) = DECL_COMMON (decl);
2627 DECL_COMDAT (guard) = DECL_COMDAT (decl);
2628 if (DECL_ONE_ONLY (decl))
2629 make_decl_one_only (guard, cxx_comdat_group (guard));
2630 if (TREE_PUBLIC (decl))
2631 DECL_WEAK (guard) = DECL_WEAK (decl);
2632 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2633 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2635 DECL_ARTIFICIAL (guard) = 1;
2636 DECL_IGNORED_P (guard) = 1;
2637 TREE_USED (guard) = 1;
2638 pushdecl_top_level_and_finish (guard, NULL_TREE);
2643 /* Return those bits of the GUARD variable that should be set when the
2644 guarded entity is actually initialized. */
2647 get_guard_bits (tree guard)
2649 if (!targetm.cxx.guard_mask_bit ())
2651 /* We only set the first byte of the guard, in order to leave room
2652 for a mutex in the high-order bits. */
2653 guard = build1 (ADDR_EXPR,
2654 build_pointer_type (TREE_TYPE (guard)),
2656 guard = build1 (NOP_EXPR,
2657 build_pointer_type (char_type_node),
2659 guard = build1 (INDIRECT_REF, char_type_node, guard);
2665 /* Return an expression which determines whether or not the GUARD
2666 variable has already been initialized. */
2669 get_guard_cond (tree guard)
2673 /* Check to see if the GUARD is zero. */
2674 guard = get_guard_bits (guard);
2676 /* Mask off all but the low bit. */
2677 if (targetm.cxx.guard_mask_bit ())
2679 guard_value = integer_one_node;
2680 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2681 guard_value = convert (TREE_TYPE (guard), guard_value);
2682 guard = cp_build_binary_op (input_location,
2683 BIT_AND_EXPR, guard, guard_value,
2684 tf_warning_or_error);
2687 guard_value = integer_zero_node;
2688 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2689 guard_value = convert (TREE_TYPE (guard), guard_value);
2690 return cp_build_binary_op (input_location,
2691 EQ_EXPR, guard, guard_value,
2692 tf_warning_or_error);
2695 /* Return an expression which sets the GUARD variable, indicating that
2696 the variable being guarded has been initialized. */
2699 set_guard (tree guard)
2703 /* Set the GUARD to one. */
2704 guard = get_guard_bits (guard);
2705 guard_init = integer_one_node;
2706 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2707 guard_init = convert (TREE_TYPE (guard), guard_init);
2708 return cp_build_modify_expr (guard, NOP_EXPR, guard_init,
2709 tf_warning_or_error);
2712 /* Start the process of running a particular set of global constructors
2713 or destructors. Subroutine of do_[cd]tors. */
2716 start_objects (int method_type, int initp)
2722 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2724 if (initp != DEFAULT_INIT_PRIORITY)
2734 sprintf (type, "sub_%c%c%.5u", method_type, joiner, initp);
2737 sprintf (type, "sub_%c", method_type);
2739 fndecl = build_lang_decl (FUNCTION_DECL,
2740 get_file_function_name (type),
2741 build_function_type_list (void_type_node,
2743 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2745 TREE_PUBLIC (current_function_decl) = 0;
2747 /* Mark as artificial because it's not explicitly in the user's
2749 DECL_ARTIFICIAL (current_function_decl) = 1;
2751 /* Mark this declaration as used to avoid spurious warnings. */
2752 TREE_USED (current_function_decl) = 1;
2754 /* Mark this function as a global constructor or destructor. */
2755 if (method_type == 'I')
2756 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2758 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2760 body = begin_compound_stmt (BCS_FN_BODY);
2765 /* Finish the process of running a particular set of global constructors
2766 or destructors. Subroutine of do_[cd]tors. */
2769 finish_objects (int method_type, int initp, tree body)
2774 finish_compound_stmt (body);
2775 fn = finish_function (0);
2777 if (method_type == 'I')
2779 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2780 decl_init_priority_insert (fn, initp);
2784 DECL_STATIC_DESTRUCTOR (fn) = 1;
2785 decl_fini_priority_insert (fn, initp);
2788 expand_or_defer_fn (fn);
2791 /* The names of the parameters to the function created to handle
2792 initializations and destructions for objects with static storage
2794 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2795 #define PRIORITY_IDENTIFIER "__priority"
2797 /* The name of the function we create to handle initializations and
2798 destructions for objects with static storage duration. */
2799 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2801 /* The declaration for the __INITIALIZE_P argument. */
2802 static GTY(()) tree initialize_p_decl;
2804 /* The declaration for the __PRIORITY argument. */
2805 static GTY(()) tree priority_decl;
2807 /* The declaration for the static storage duration function. */
2808 static GTY(()) tree ssdf_decl;
2810 /* All the static storage duration functions created in this
2811 translation unit. */
2812 static GTY(()) VEC(tree,gc) *ssdf_decls;
2814 /* A map from priority levels to information about that priority
2815 level. There may be many such levels, so efficient lookup is
2817 static splay_tree priority_info_map;
2819 /* Begins the generation of the function that will handle all
2820 initialization and destruction of objects with static storage
2821 duration. The function generated takes two parameters of type
2822 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2823 nonzero, it performs initializations. Otherwise, it performs
2824 destructions. It only performs those initializations or
2825 destructions with the indicated __PRIORITY. The generated function
2828 It is assumed that this function will only be called once per
2829 translation unit. */
2832 start_static_storage_duration_function (unsigned count)
2836 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2838 /* Create the identifier for this function. It will be of the form
2839 SSDF_IDENTIFIER_<number>. */
2840 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2842 type = build_function_type_list (void_type_node,
2843 integer_type_node, integer_type_node,
2846 /* Create the FUNCTION_DECL itself. */
2847 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2848 get_identifier (id),
2850 TREE_PUBLIC (ssdf_decl) = 0;
2851 DECL_ARTIFICIAL (ssdf_decl) = 1;
2853 /* Put this function in the list of functions to be called from the
2854 static constructors and destructors. */
2857 ssdf_decls = VEC_alloc (tree, gc, 32);
2859 /* Take this opportunity to initialize the map from priority
2860 numbers to information about that priority level. */
2861 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2862 /*delete_key_fn=*/0,
2863 /*delete_value_fn=*/
2864 (splay_tree_delete_value_fn) &free);
2866 /* We always need to generate functions for the
2867 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2868 priorities later, we'll be sure to find the
2869 DEFAULT_INIT_PRIORITY. */
2870 get_priority_info (DEFAULT_INIT_PRIORITY);
2873 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2875 /* Create the argument list. */
2876 initialize_p_decl = cp_build_parm_decl
2877 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2878 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2879 TREE_USED (initialize_p_decl) = 1;
2880 priority_decl = cp_build_parm_decl
2881 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2882 DECL_CONTEXT (priority_decl) = ssdf_decl;
2883 TREE_USED (priority_decl) = 1;
2885 DECL_CHAIN (initialize_p_decl) = priority_decl;
2886 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2888 /* Put the function in the global scope. */
2889 pushdecl (ssdf_decl);
2891 /* Start the function itself. This is equivalent to declaring the
2894 static void __ssdf (int __initialize_p, init __priority_p);
2896 It is static because we only need to call this function from the
2897 various constructor and destructor functions for this module. */
2898 start_preparsed_function (ssdf_decl,
2899 /*attrs=*/NULL_TREE,
2902 /* Set up the scope of the outermost block in the function. */
2903 body = begin_compound_stmt (BCS_FN_BODY);
2908 /* Finish the generation of the function which performs initialization
2909 and destruction of objects with static storage duration. After
2910 this point, no more such objects can be created. */
2913 finish_static_storage_duration_function (tree body)
2915 /* Close out the function. */
2916 finish_compound_stmt (body);
2917 expand_or_defer_fn (finish_function (0));
2920 /* Return the information about the indicated PRIORITY level. If no
2921 code to handle this level has yet been generated, generate the
2922 appropriate prologue. */
2924 static priority_info
2925 get_priority_info (int priority)
2930 n = splay_tree_lookup (priority_info_map,
2931 (splay_tree_key) priority);
2934 /* Create a new priority information structure, and insert it
2936 pi = XNEW (struct priority_info_s);
2937 pi->initializations_p = 0;
2938 pi->destructions_p = 0;
2939 splay_tree_insert (priority_info_map,
2940 (splay_tree_key) priority,
2941 (splay_tree_value) pi);
2944 pi = (priority_info) n->value;
2949 /* The effective initialization priority of a DECL. */
2951 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2952 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2953 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2955 /* Whether a DECL needs a guard to protect it against multiple
2958 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2959 || DECL_ONE_ONLY (decl) \
2960 || DECL_WEAK (decl)))
2962 /* Called from one_static_initialization_or_destruction(),
2964 Walks the initializer list of a global variable and looks for
2965 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
2966 and that have their DECL_CONTEXT() == NULL.
2967 For each such temporary variable, set their DECL_CONTEXT() to
2968 the current function. This is necessary because otherwise
2969 some optimizers (enabled by -O2 -fprofile-arcs) might crash
2970 when trying to refer to a temporary variable that does not have
2971 it's DECL_CONTECT() properly set. */
2973 fix_temporary_vars_context_r (tree *node,
2974 int *unused ATTRIBUTE_UNUSED,
2975 void *unused1 ATTRIBUTE_UNUSED)
2977 gcc_assert (current_function_decl);
2979 if (TREE_CODE (*node) == BIND_EXPR)
2983 for (var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var))
2984 if (TREE_CODE (var) == VAR_DECL
2986 && DECL_ARTIFICIAL (var)
2987 && !DECL_CONTEXT (var))
2988 DECL_CONTEXT (var) = current_function_decl;
2994 /* Set up to handle the initialization or destruction of DECL. If
2995 INITP is nonzero, we are initializing the variable. Otherwise, we
2996 are destroying it. */
2999 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
3001 tree guard_if_stmt = NULL_TREE;
3004 /* If we are supposed to destruct and there's a trivial destructor,
3005 nothing has to be done. */
3007 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3010 /* Trick the compiler into thinking we are at the file and line
3011 where DECL was declared so that error-messages make sense, and so
3012 that the debugger will show somewhat sensible file and line
3014 input_location = DECL_SOURCE_LOCATION (decl);
3016 /* Make sure temporary variables in the initialiser all have
3017 their DECL_CONTEXT() set to a value different from NULL_TREE.
3018 This can happen when global variables initialisers are built.
3019 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3020 the temporary variables that might have been generated in the
3021 accompagning initialisers is NULL_TREE, meaning the variables have been
3022 declared in the global namespace.
3023 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3024 of the temporaries are set to the current function decl. */
3025 cp_walk_tree_without_duplicates (&init,
3026 fix_temporary_vars_context_r,
3033 Access control for implicit calls to the constructors,
3034 the conversion functions, or the destructor called to
3035 create and destroy a static data member is performed as
3036 if these calls appeared in the scope of the member's
3039 we pretend we are in a static member function of the class of
3040 which the DECL is a member. */
3041 if (member_p (decl))
3043 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
3044 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
3047 /* Assume we don't need a guard. */
3049 /* We need a guard if this is an object with external linkage that
3050 might be initialized in more than one place. (For example, a
3051 static data member of a template, when the data member requires
3053 if (NEEDS_GUARD_P (decl))
3057 guard = get_guard (decl);
3059 /* When using __cxa_atexit, we just check the GUARD as we would
3060 for a local static. */
3061 if (flag_use_cxa_atexit)
3063 /* When using __cxa_atexit, we never try to destroy
3064 anything from a static destructor. */
3066 guard_cond = get_guard_cond (guard);
3068 /* If we don't have __cxa_atexit, then we will be running
3069 destructors from .fini sections, or their equivalents. So,
3070 we need to know how many times we've tried to initialize this
3071 object. We do initializations only if the GUARD is zero,
3072 i.e., if we are the first to initialize the variable. We do
3073 destructions only if the GUARD is one, i.e., if we are the
3074 last to destroy the variable. */
3077 = cp_build_binary_op (input_location,
3079 cp_build_unary_op (PREINCREMENT_EXPR,
3082 tf_warning_or_error),
3084 tf_warning_or_error);
3087 = cp_build_binary_op (input_location,
3089 cp_build_unary_op (PREDECREMENT_EXPR,
3092 tf_warning_or_error),
3094 tf_warning_or_error);
3096 guard_if_stmt = begin_if_stmt ();
3097 finish_if_stmt_cond (guard_cond, guard_if_stmt);
3101 /* If we're using __cxa_atexit, we have not already set the GUARD,
3102 so we must do so now. */
3103 if (guard && initp && flag_use_cxa_atexit)
3104 finish_expr_stmt (set_guard (guard));
3106 /* Perform the initialization or destruction. */
3110 finish_expr_stmt (init);
3112 /* If we're using __cxa_atexit, register a function that calls the
3113 destructor for the object. */
3114 if (flag_use_cxa_atexit)
3115 finish_expr_stmt (register_dtor_fn (decl));
3118 finish_expr_stmt (build_cleanup (decl));
3120 /* Finish the guard if-stmt, if necessary. */
3123 finish_then_clause (guard_if_stmt);
3124 finish_if_stmt (guard_if_stmt);
3127 /* Now that we're done with DECL we don't need to pretend to be a
3128 member of its class any longer. */
3129 DECL_CONTEXT (current_function_decl) = NULL_TREE;
3130 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
3133 /* Generate code to do the initialization or destruction of the decls in VARS,
3134 a TREE_LIST of VAR_DECL with static storage duration.
3135 Whether initialization or destruction is performed is specified by INITP. */
3138 do_static_initialization_or_destruction (tree vars, bool initp)
3140 tree node, init_if_stmt, cond;
3142 /* Build the outer if-stmt to check for initialization or destruction. */
3143 init_if_stmt = begin_if_stmt ();
3144 cond = initp ? integer_one_node : integer_zero_node;
3145 cond = cp_build_binary_op (input_location,
3149 tf_warning_or_error);
3150 finish_if_stmt_cond (cond, init_if_stmt);
3154 tree decl = TREE_VALUE (node);
3155 tree priority_if_stmt;
3159 /* If we don't need a destructor, there's nothing to do. Avoid
3160 creating a possibly empty if-stmt. */
3161 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
3163 node = TREE_CHAIN (node);
3167 /* Remember that we had an initialization or finalization at this
3169 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
3170 pi = get_priority_info (priority);
3172 pi->initializations_p = 1;
3174 pi->destructions_p = 1;
3176 /* Conditionalize this initialization on being in the right priority
3177 and being initializing/finalizing appropriately. */
3178 priority_if_stmt = begin_if_stmt ();
3179 cond = cp_build_binary_op (input_location,
3182 build_int_cst (NULL_TREE, priority),
3183 tf_warning_or_error);
3184 finish_if_stmt_cond (cond, priority_if_stmt);
3186 /* Process initializers with same priority. */
3188 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
3189 node = TREE_CHAIN (node))
3190 /* Do one initialization or destruction. */
3191 one_static_initialization_or_destruction (TREE_VALUE (node),
3192 TREE_PURPOSE (node), initp);
3194 /* Finish up the priority if-stmt body. */
3195 finish_then_clause (priority_if_stmt);
3196 finish_if_stmt (priority_if_stmt);
3200 /* Finish up the init/destruct if-stmt body. */
3201 finish_then_clause (init_if_stmt);
3202 finish_if_stmt (init_if_stmt);
3205 /* VARS is a list of variables with static storage duration which may
3206 need initialization and/or finalization. Remove those variables
3207 that don't really need to be initialized or finalized, and return
3208 the resulting list. The order in which the variables appear in
3209 VARS is in reverse order of the order in which they should actually
3210 be initialized. The list we return is in the unreversed order;
3211 i.e., the first variable should be initialized first. */
3214 prune_vars_needing_no_initialization (tree *vars)
3217 tree result = NULL_TREE;
3222 tree decl = TREE_VALUE (t);
3223 tree init = TREE_PURPOSE (t);
3225 /* Deal gracefully with error. */
3226 if (decl == error_mark_node)
3228 var = &TREE_CHAIN (t);
3232 /* The only things that can be initialized are variables. */
3233 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3235 /* If this object is not defined, we don't need to do anything
3237 if (DECL_EXTERNAL (decl))
3239 var = &TREE_CHAIN (t);
3243 /* Also, if the initializer already contains errors, we can bail
3245 if (init && TREE_CODE (init) == TREE_LIST
3246 && value_member (error_mark_node, init))
3248 var = &TREE_CHAIN (t);
3252 /* This variable is going to need initialization and/or
3253 finalization, so we add it to the list. */
3254 *var = TREE_CHAIN (t);
3255 TREE_CHAIN (t) = result;
3262 /* Make sure we have told the back end about all the variables in
3266 write_out_vars (tree vars)
3270 for (v = vars; v; v = TREE_CHAIN (v))
3272 tree var = TREE_VALUE (v);
3273 if (!var_finalized_p (var))
3275 import_export_decl (var);
3276 rest_of_decl_compilation (var, 1, 1);
3281 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3282 (otherwise) that will initialize all global objects with static
3283 storage duration having the indicated PRIORITY. */
3286 generate_ctor_or_dtor_function (bool constructor_p, int priority,
3294 input_location = *locus;
3296 /* Was: locus->line++; */
3298 /* We use `I' to indicate initialization and `D' to indicate
3300 function_key = constructor_p ? 'I' : 'D';
3302 /* We emit the function lazily, to avoid generating empty
3303 global constructors and destructors. */
3306 /* For Objective-C++, we may need to initialize metadata found in this module.
3307 This must be done _before_ any other static initializations. */
3308 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
3309 && constructor_p && objc_static_init_needed_p ())
3311 body = start_objects (function_key, priority);
3312 objc_generate_static_init_call (NULL_TREE);
3315 /* Call the static storage duration function with appropriate
3317 FOR_EACH_VEC_ELT (tree, ssdf_decls, i, fndecl)
3319 /* Calls to pure or const functions will expand to nothing. */
3320 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
3325 body = start_objects (function_key, priority);
3327 call = cp_build_function_call_nary (fndecl, tf_warning_or_error,
3328 build_int_cst (NULL_TREE,
3330 build_int_cst (NULL_TREE,
3333 finish_expr_stmt (call);
3337 /* Close out the function. */
3339 finish_objects (function_key, priority, body);
3342 /* Generate constructor and destructor functions for the priority
3346 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3348 location_t *locus = (location_t *) data;
3349 int priority = (int) n->key;
3350 priority_info pi = (priority_info) n->value;
3352 /* Generate the functions themselves, but only if they are really
3354 if (pi->initializations_p)
3355 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3356 if (pi->destructions_p)
3357 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3359 /* Keep iterating. */
3363 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3364 decls referenced from front-end specific constructs; it will be called
3365 only for language-specific tree nodes.
3367 Here we must deal with member pointers. */
3370 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3374 switch (TREE_CODE (t))
3377 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3378 cgraph_mark_address_taken_node (
3379 cgraph_get_create_node (PTRMEM_CST_MEMBER (t)));
3382 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3383 cgraph_mark_address_taken_node (
3384 cgraph_get_create_node (BASELINK_FUNCTIONS (t)));
3387 if (DECL_CONTEXT (t)
3388 && flag_use_repository
3389 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3390 /* If we need a static variable in a function, then we
3391 need the containing function. */
3392 mark_decl_referenced (DECL_CONTEXT (t));
3401 /* Java requires that we be able to reference a local address for a
3402 method, and not be confused by PLT entries. If hidden aliases are
3403 supported, collect and return all the functions for which we should
3404 emit a hidden alias. */
3406 static struct pointer_set_t *
3407 collect_candidates_for_java_method_aliases (void)
3409 struct cgraph_node *node;
3410 struct pointer_set_t *candidates = NULL;
3412 #ifndef HAVE_GAS_HIDDEN
3416 for (node = cgraph_nodes; node ; node = node->next)
3418 tree fndecl = node->decl;
3420 if (DECL_CONTEXT (fndecl)
3421 && TYPE_P (DECL_CONTEXT (fndecl))
3422 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3423 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3425 if (candidates == NULL)
3426 candidates = pointer_set_create ();
3427 pointer_set_insert (candidates, fndecl);
3435 /* Java requires that we be able to reference a local address for a
3436 method, and not be confused by PLT entries. If hidden aliases are
3437 supported, emit one for each java function that we've emitted.
3438 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3439 by collect_candidates_for_java_method_aliases. */
3442 build_java_method_aliases (struct pointer_set_t *candidates)
3444 struct cgraph_node *node;
3446 #ifndef HAVE_GAS_HIDDEN
3450 for (node = cgraph_nodes; node ; node = node->next)
3452 tree fndecl = node->decl;
3454 if (TREE_ASM_WRITTEN (fndecl)
3455 && pointer_set_contains (candidates, fndecl))
3457 /* Mangle the name in a predictable way; we need to reference
3458 this from a java compiled object file. */
3459 tree oid, nid, alias;
3463 oid = DECL_ASSEMBLER_NAME (fndecl);
3464 oname = IDENTIFIER_POINTER (oid);
3465 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3466 nname = ACONCAT (("_ZGA", oname+2, NULL));
3467 nid = get_identifier (nname);
3469 alias = make_alias_for (fndecl, nid);
3470 TREE_PUBLIC (alias) = 1;
3471 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3473 assemble_alias (alias, oid);
3478 /* Return C++ property of T, based on given operation OP. */
3481 cpp_check (tree t, cpp_operation op)
3486 return DECL_PURE_VIRTUAL_P (t);
3487 case IS_CONSTRUCTOR:
3488 return DECL_CONSTRUCTOR_P (t);
3490 return DECL_DESTRUCTOR_P (t);
3491 case IS_COPY_CONSTRUCTOR:
3492 return DECL_COPY_CONSTRUCTOR_P (t);
3494 return TREE_CODE (t) == TEMPLATE_DECL;
3500 /* Collect source file references recursively, starting from NAMESPC. */
3503 collect_source_refs (tree namespc)
3510 /* Iterate over names in this name space. */
3511 for (t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
3512 if (!DECL_IS_BUILTIN (t) )
3513 collect_source_ref (DECL_SOURCE_FILE (t));
3515 /* Dump siblings, if any */
3516 collect_source_refs (TREE_CHAIN (namespc));
3518 /* Dump children, if any */
3519 collect_source_refs (NAMESPACE_LEVEL (namespc)->namespaces);
3522 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
3523 starting from NAMESPC. */
3526 collect_ada_namespace (tree namespc, const char *source_file)
3531 /* Collect decls from this namespace */
3532 collect_ada_nodes (NAMESPACE_LEVEL (namespc)->names, source_file);
3534 /* Collect siblings, if any */
3535 collect_ada_namespace (TREE_CHAIN (namespc), source_file);
3537 /* Collect children, if any */
3538 collect_ada_namespace (NAMESPACE_LEVEL (namespc)->namespaces, source_file);
3541 /* Returns true iff there is a definition available for variable or
3545 decl_defined_p (tree decl)
3547 if (TREE_CODE (decl) == FUNCTION_DECL)
3548 return (DECL_INITIAL (decl) != NULL_TREE);
3551 gcc_assert (TREE_CODE (decl) == VAR_DECL);
3552 return !DECL_EXTERNAL (decl);
3556 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
3560 An integral constant-expression can only involve ... const
3561 variables of integral or enumeration types initialized with
3562 constant expressions ...
3564 C++0x also allows constexpr variables and temporaries initialized
3565 with constant expressions. We handle the former here, but the latter
3566 are just folded away in cxx_eval_constant_expression.
3568 The standard does not require that the expression be non-volatile.
3569 G++ implements the proposed correction in DR 457. */
3572 decl_constant_var_p (tree decl)
3575 tree type = TREE_TYPE (decl);
3576 if (TREE_CODE (decl) != VAR_DECL)
3578 if (DECL_DECLARED_CONSTEXPR_P (decl)
3579 || (CP_TYPE_CONST_NON_VOLATILE_P (type)
3580 && INTEGRAL_OR_ENUMERATION_TYPE_P (type)))
3582 /* We don't know if a template static data member is initialized with
3583 a constant expression until we instantiate its initializer. Even
3584 in the case of a constexpr variable, we can't treat it as a
3585 constant until its initializer is complete in case it's used in
3586 its own initializer. */
3588 ret = DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl);
3596 /* Returns true if DECL could be a symbolic constant variable, depending on
3600 decl_maybe_constant_var_p (tree decl)
3602 tree type = TREE_TYPE (decl);
3603 if (TREE_CODE (decl) != VAR_DECL)
3605 if (DECL_DECLARED_CONSTEXPR_P (decl))
3607 return (CP_TYPE_CONST_NON_VOLATILE_P (type)
3608 && INTEGRAL_OR_ENUMERATION_TYPE_P (type));
3611 /* Complain that DECL uses a type with no linkage but is never defined. */
3614 no_linkage_error (tree decl)
3616 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
3617 if (TYPE_ANONYMOUS_P (t))
3619 permerror (0, "%q+#D, declared using anonymous type, "
3620 "is used but never defined", decl);
3621 if (is_typedef_decl (TYPE_NAME (t)))
3622 permerror (0, "%q+#D does not refer to the unqualified type, "
3623 "so it is not used for linkage", TYPE_NAME (t));
3626 permerror (0, "%q+#D, declared using local type %qT, "
3627 "is used but never defined", decl, t);
3630 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
3633 collect_all_refs (const char *source_file)
3635 collect_ada_namespace (global_namespace, source_file);
3638 /* This routine is called at the end of compilation.
3639 Its job is to create all the code needed to initialize and
3640 destroy the global aggregates. We do the destruction
3641 first, since that way we only need to reverse the decls once. */
3644 cp_write_global_declarations (void)
3650 unsigned ssdf_count = 0;
3653 struct pointer_set_t *candidates;
3655 locus = input_location;
3658 /* Bad parse errors. Just forget about it. */
3659 if (! global_bindings_p () || current_class_type
3660 || !VEC_empty (tree,decl_namespace_list))
3664 c_common_write_pch ();
3666 /* Handle -fdump-ada-spec[-slim] */
3667 if (dump_enabled_p (TDI_ada))
3669 if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM)
3670 collect_source_ref (main_input_filename);
3672 collect_source_refs (global_namespace);
3674 dump_ada_specs (collect_all_refs, cpp_check);
3677 /* FIXME - huh? was input_line -= 1;*/
3679 timevar_start (TV_PHASE_DEFERRED);
3681 /* We now have to write out all the stuff we put off writing out.
3684 o Template specializations that we have not yet instantiated,
3685 but which are needed.
3686 o Initialization and destruction for non-local objects with
3687 static storage duration. (Local objects with static storage
3688 duration are initialized when their scope is first entered,
3689 and are cleaned up via atexit.)
3690 o Virtual function tables.
3692 All of these may cause others to be needed. For example,
3693 instantiating one function may cause another to be needed, and
3694 generating the initializer for an object may cause templates to be
3695 instantiated, etc., etc. */
3697 emit_support_tinfos ();
3706 /* If there are templates that we've put off instantiating, do
3708 instantiate_pending_templates (retries);
3711 /* Write out virtual tables as required. Note that writing out
3712 the virtual table for a template class may cause the
3713 instantiation of members of that class. If we write out
3714 vtables then we remove the class from our list so we don't
3715 have to look at it again. */
3717 while (keyed_classes != NULL_TREE
3718 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3721 keyed_classes = TREE_CHAIN (keyed_classes);
3727 tree next = TREE_CHAIN (t);
3731 if (maybe_emit_vtables (TREE_VALUE (next)))
3734 TREE_CHAIN (t) = TREE_CHAIN (next);
3739 next = TREE_CHAIN (t);
3743 /* Write out needed type info variables. We have to be careful
3744 looping through unemitted decls, because emit_tinfo_decl may
3745 cause other variables to be needed. New elements will be
3746 appended, and we remove from the vector those that actually
3748 for (i = VEC_length (tree, unemitted_tinfo_decls);
3749 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3750 if (emit_tinfo_decl (t))
3753 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3756 /* The list of objects with static storage duration is built up
3757 in reverse order. We clear STATIC_AGGREGATES so that any new
3758 aggregates added during the initialization of these will be
3759 initialized in the correct order when we next come around the
3761 vars = prune_vars_needing_no_initialization (&static_aggregates);
3765 /* We need to start a new initialization function each time
3766 through the loop. That's because we need to know which
3767 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3768 isn't computed until a function is finished, and written
3769 out. That's a deficiency in the back end. When this is
3770 fixed, these initialization functions could all become
3771 inline, with resulting performance improvements. */
3774 /* Set the line and file, so that it is obviously not from
3776 input_location = locus;
3777 ssdf_body = start_static_storage_duration_function (ssdf_count);
3779 /* Make sure the back end knows about all the variables. */
3780 write_out_vars (vars);
3782 /* First generate code to do all the initializations. */
3784 do_static_initialization_or_destruction (vars, /*initp=*/true);
3786 /* Then, generate code to do all the destructions. Do these
3787 in reverse order so that the most recently constructed
3788 variable is the first destroyed. If we're using
3789 __cxa_atexit, then we don't need to do this; functions
3790 were registered at initialization time to destroy the
3792 if (!flag_use_cxa_atexit && vars)
3794 vars = nreverse (vars);
3795 do_static_initialization_or_destruction (vars, /*initp=*/false);
3800 /* Finish up the static storage duration function for this
3802 input_location = locus;
3803 finish_static_storage_duration_function (ssdf_body);
3805 /* All those initializations and finalizations might cause
3806 us to need more inline functions, more template
3807 instantiations, etc. */
3810 /* ??? was: locus.line++; */
3813 /* Go through the set of inline functions whose bodies have not
3814 been emitted yet. If out-of-line copies of these functions
3815 are required, emit them. */
3816 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3818 /* Does it need synthesizing? */
3819 if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
3820 && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
3822 /* Even though we're already at the top-level, we push
3823 there again. That way, when we pop back a few lines
3824 hence, all of our state is restored. Otherwise,
3825 finish_function doesn't clean things up, and we end
3826 up with CURRENT_FUNCTION_DECL set. */
3827 push_to_top_level ();
3828 /* The decl's location will mark where it was first
3829 needed. Save that so synthesize method can indicate
3830 where it was needed from, in case of error */
3831 input_location = DECL_SOURCE_LOCATION (decl);
3832 synthesize_method (decl);
3833 pop_from_top_level ();
3837 if (!DECL_SAVED_TREE (decl))
3840 /* We lie to the back end, pretending that some functions
3841 are not defined when they really are. This keeps these
3842 functions from being put out unnecessarily. But, we must
3843 stop lying when the functions are referenced, or if they
3844 are not comdat since they need to be put out now. If
3845 DECL_INTERFACE_KNOWN, then we have already set
3846 DECL_EXTERNAL appropriately, so there's no need to check
3847 again, and we do not want to clear DECL_EXTERNAL if a
3848 previous call to import_export_decl set it.
3850 This is done in a separate for cycle, because if some
3851 deferred function is contained in another deferred
3852 function later in deferred_fns varray,
3853 rest_of_compilation would skip this function and we
3854 really cannot expand the same function twice. */
3855 import_export_decl (decl);
3856 if (DECL_NOT_REALLY_EXTERN (decl)
3857 && DECL_INITIAL (decl)
3858 && decl_needed_p (decl))
3860 struct cgraph_node *node = cgraph_get_node (decl), *alias, *next;
3862 DECL_EXTERNAL (decl) = 0;
3863 /* If we mark !DECL_EXTERNAL one of the same body aliases,
3864 we need to mark all of them that way. */
3865 if (node && node->same_body)
3867 DECL_EXTERNAL (node->decl) = 0;
3868 for (alias = node->same_body; alias; alias = alias->next)
3869 DECL_EXTERNAL (alias->decl) = 0;
3871 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3872 group, we need to mark all symbols in the same comdat group
3874 if (node->same_comdat_group)
3875 for (next = node->same_comdat_group;
3877 next = next->same_comdat_group)
3879 DECL_EXTERNAL (next->decl) = 0;
3880 if (next->same_body)
3882 for (alias = next->same_body;
3884 alias = alias->next)
3885 DECL_EXTERNAL (alias->decl) = 0;
3890 /* If we're going to need to write this function out, and
3891 there's already a body for it, create RTL for it now.
3892 (There might be no body if this is a method we haven't
3893 gotten around to synthesizing yet.) */
3894 if (!DECL_EXTERNAL (decl)
3895 && decl_needed_p (decl)
3896 && !TREE_ASM_WRITTEN (decl)
3897 && !cgraph_get_node (decl)->local.finalized)
3899 /* We will output the function; no longer consider it in this
3901 DECL_DEFER_OUTPUT (decl) = 0;
3902 /* Generate RTL for this function now that we know we
3904 expand_or_defer_fn (decl);
3905 /* If we're compiling -fsyntax-only pretend that this
3906 function has been written out so that we don't try to
3908 if (flag_syntax_only)
3909 TREE_ASM_WRITTEN (decl) = 1;
3914 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3917 /* Static data members are just like namespace-scope globals. */
3918 FOR_EACH_VEC_ELT (tree, pending_statics, i, decl)
3920 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
3921 /* Don't write it out if we haven't seen a definition. */
3922 || DECL_IN_AGGR_P (decl))
3924 import_export_decl (decl);
3925 /* If this static data member is needed, provide it to the
3927 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3928 DECL_EXTERNAL (decl) = 0;
3930 if (VEC_length (tree, pending_statics) != 0
3931 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3932 VEC_length (tree, pending_statics)))
3939 /* All used inline functions must have a definition at this point. */
3940 FOR_EACH_VEC_ELT (tree, deferred_fns, i, decl)
3942 if (/* Check online inline functions that were actually used. */
3943 DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3944 /* If the definition actually was available here, then the
3945 fact that the function was not defined merely represents
3946 that for some reason (use of a template repository,
3947 #pragma interface, etc.) we decided not to emit the
3949 && !DECL_INITIAL (decl)
3950 /* An explicit instantiation can be used to specify
3951 that the body is in another unit. It will have
3952 already verified there was a definition. */
3953 && !DECL_EXPLICIT_INSTANTIATION (decl))
3955 warning (0, "inline function %q+D used but never defined", decl);
3956 /* Avoid a duplicate warning from check_global_declaration_1. */
3957 TREE_NO_WARNING (decl) = 1;
3961 /* So must decls that use a type with no linkage. */
3962 FOR_EACH_VEC_ELT (tree, no_linkage_decls, i, decl)
3963 if (!decl_defined_p (decl))
3964 no_linkage_error (decl);
3966 /* Then, do the Objective-C stuff. This is where all the
3967 Objective-C module stuff gets generated (symtab,
3968 class/protocol/selector lists etc). This must be done after C++
3969 templates, destructors etc. so that selectors used in C++
3970 templates are properly allocated. */
3971 if (c_dialect_objc ())
3972 objc_write_global_declarations ();
3974 /* We give C linkage to static constructors and destructors. */
3975 push_lang_context (lang_name_c);
3977 /* Generate initialization and destruction functions for all
3978 priorities for which they are required. */
3979 if (priority_info_map)
3980 splay_tree_foreach (priority_info_map,
3981 generate_ctor_and_dtor_functions_for_priority,
3983 else if (c_dialect_objc () && objc_static_init_needed_p ())
3984 /* If this is obj-c++ and we need a static init, call
3985 generate_ctor_or_dtor_function. */
3986 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3987 DEFAULT_INIT_PRIORITY, &locus);
3989 /* We're done with the splay-tree now. */
3990 if (priority_info_map)
3991 splay_tree_delete (priority_info_map);
3993 /* Generate any missing aliases. */
3994 maybe_apply_pending_pragma_weaks ();
3996 /* We're done with static constructors, so we can go back to "C++"
3998 pop_lang_context ();
4000 /* Collect candidates for Java hidden aliases. */
4001 candidates = collect_candidates_for_java_method_aliases ();
4003 timevar_stop (TV_PHASE_DEFERRED);
4004 timevar_start (TV_PHASE_CGRAPH);
4006 cgraph_finalize_compilation_unit ();
4008 timevar_stop (TV_PHASE_CGRAPH);
4009 timevar_start (TV_PHASE_CHECK_DBGINFO);
4011 /* Now, issue warnings about static, but not defined, functions,
4012 etc., and emit debugging information. */
4013 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
4014 if (VEC_length (tree, pending_statics) != 0)
4016 check_global_declarations (VEC_address (tree, pending_statics),
4017 VEC_length (tree, pending_statics));
4018 emit_debug_global_declarations (VEC_address (tree, pending_statics),
4019 VEC_length (tree, pending_statics));
4022 perform_deferred_noexcept_checks ();
4024 /* Generate hidden aliases for Java. */
4027 build_java_method_aliases (candidates);
4028 pointer_set_destroy (candidates);
4033 /* The entire file is now complete. If requested, dump everything
4037 FILE *stream = dump_begin (TDI_tu, &flags);
4041 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
4042 dump_end (TDI_tu, stream);
4046 if (flag_detailed_statistics)
4048 dump_tree_statistics ();
4049 dump_time_statistics ();
4051 input_location = locus;
4053 #ifdef ENABLE_CHECKING
4054 validate_conversion_obstack ();
4055 #endif /* ENABLE_CHECKING */
4057 timevar_stop (TV_PHASE_CHECK_DBGINFO);
4060 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4061 function to call in parse-tree form; it has not yet been
4062 semantically analyzed. ARGS are the arguments to the function.
4063 They have already been semantically analyzed. This may change
4067 build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args)
4070 VEC(tree,gc) *orig_args = NULL;
4075 object = TREE_OPERAND (fn, 0);
4077 if (processing_template_decl)
4079 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
4080 || TREE_CODE (fn) == MEMBER_REF);
4081 if (type_dependent_expression_p (fn)
4082 || any_type_dependent_arguments_p (*args))
4083 return build_nt_call_vec (fn, *args);
4085 orig_args = make_tree_vector_copy (*args);
4087 /* Transform the arguments and add the implicit "this"
4088 parameter. That must be done before the FN is transformed
4089 because we depend on the form of FN. */
4090 make_args_non_dependent (*args);
4091 object = build_non_dependent_expr (object);
4092 if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
4094 if (TREE_CODE (fn) == DOTSTAR_EXPR)
4095 object = cp_build_addr_expr (object, tf_warning_or_error);
4096 VEC_safe_insert (tree, gc, *args, 0, object);
4098 /* Now that the arguments are done, transform FN. */
4099 fn = build_non_dependent_expr (fn);
4102 /* A qualified name corresponding to a bound pointer-to-member is
4103 represented as an OFFSET_REF:
4105 struct B { void g(); };
4107 void B::g() { (this->*p)(); } */
4108 if (TREE_CODE (fn) == OFFSET_REF)
4110 tree object_addr = cp_build_addr_expr (object, tf_warning_or_error);
4111 fn = TREE_OPERAND (fn, 1);
4112 fn = get_member_function_from_ptrfunc (&object_addr, fn);
4113 VEC_safe_insert (tree, gc, *args, 0, object_addr);
4116 if (CLASS_TYPE_P (TREE_TYPE (fn)))
4117 expr = build_op_call (fn, args, tf_warning_or_error);
4119 expr = cp_build_function_call_vec (fn, args, tf_warning_or_error);
4120 if (processing_template_decl && expr != error_mark_node)
4121 expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
4123 if (orig_args != NULL)
4124 release_tree_vector (orig_args);
4131 check_default_args (tree x)
4133 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
4134 bool saw_def = false;
4135 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
4136 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
4138 if (TREE_PURPOSE (arg))
4142 error ("default argument missing for parameter %P of %q+#D", i, x);
4143 TREE_PURPOSE (arg) = error_mark_node;
4148 /* Return true if function DECL can be inlined. This is used to force
4149 instantiation of methods that might be interesting for inlining. */
4151 possibly_inlined_p (tree decl)
4153 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
4154 if (DECL_UNINLINABLE (decl))
4156 if (!optimize || pragma_java_exceptions)
4157 return DECL_DECLARED_INLINE_P (decl);
4158 /* When optimizing, we might inline everything when flatten
4159 attribute or heuristics inlining for size or autoinlining
4164 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4165 If DECL is a specialization or implicitly declared class member,
4166 generate the actual definition. */
4169 mark_used (tree decl)
4171 /* If DECL is a BASELINK for a single function, then treat it just
4172 like the DECL for the function. Otherwise, if the BASELINK is
4173 for an overloaded function, we don't know which function was
4174 actually used until after overload resolution. */
4175 if (TREE_CODE (decl) == BASELINK)
4177 decl = BASELINK_FUNCTIONS (decl);
4178 if (really_overloaded_fn (decl))
4180 decl = OVL_CURRENT (decl);
4183 /* Set TREE_USED for the benefit of -Wunused. */
4184 TREE_USED (decl) = 1;
4185 if (DECL_CLONED_FUNCTION_P (decl))
4186 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4188 if (TREE_CODE (decl) == FUNCTION_DECL
4189 && DECL_DELETED_FN (decl))
4191 if (DECL_ARTIFICIAL (decl))
4193 if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR
4194 && LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
4196 /* We mark a lambda conversion op as deleted if we can't
4197 generate it properly; see maybe_add_lambda_conv_op. */
4198 sorry ("converting lambda which uses %<...%> to "
4199 "function pointer");
4203 error ("use of deleted function %qD", decl);
4204 if (!maybe_explain_implicit_delete (decl))
4205 error_at (DECL_SOURCE_LOCATION (decl), "declared here");
4209 /* We can only check DECL_ODR_USED on variables or functions with
4210 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4211 might need special handling for. */
4212 if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4213 || DECL_LANG_SPECIFIC (decl) == NULL
4214 || DECL_THUNK_P (decl))
4217 /* We only want to do this processing once. We don't need to keep trying
4218 to instantiate inline templates, because unit-at-a-time will make sure
4219 we get them compiled before functions that want to inline them. */
4220 if (DECL_ODR_USED (decl))
4223 /* If within finish_function, defer the rest until that function
4224 finishes, otherwise it might recurse. */
4225 if (defer_mark_used_calls)
4227 VEC_safe_push (tree, gc, deferred_mark_used_calls, decl);
4231 /* Normally, we can wait until instantiation-time to synthesize DECL.
4232 However, if DECL is a static data member initialized with a constant
4233 or a constexpr function, we need it right now because a reference to
4234 such a data member or a call to such function is not value-dependent. */
4235 if ((decl_maybe_constant_var_p (decl)
4236 || (TREE_CODE (decl) == FUNCTION_DECL
4237 && DECL_DECLARED_CONSTEXPR_P (decl)))
4238 && !DECL_INITIAL (decl)
4239 && DECL_LANG_SPECIFIC (decl)
4240 && DECL_TEMPLATE_INSTANTIATION (decl))
4242 /* Instantiating a function will result in garbage collection. We
4243 must treat this situation as if we were within the body of a
4244 function so as to avoid collecting live data only referenced from
4245 the stack (such as overload resolution candidates). */
4247 instantiate_decl (decl, /*defer_ok=*/false,
4248 /*expl_inst_class_mem_p=*/false);
4252 /* If we don't need a value, then we don't need to synthesize DECL. */
4253 if (cp_unevaluated_operand != 0)
4256 if (processing_template_decl)
4259 /* Check this too in case we're within fold_non_dependent_expr. */
4260 if (DECL_TEMPLATE_INFO (decl)
4261 && uses_template_parms (DECL_TI_ARGS (decl)))
4264 DECL_ODR_USED (decl) = 1;
4265 if (DECL_CLONED_FUNCTION_P (decl))
4266 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
4268 /* DR 757: A type without linkage shall not be used as the type of a
4269 variable or function with linkage, unless
4270 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4271 o the variable or function is not used (3.2 [basic.def.odr]) or is
4272 defined in the same translation unit. */
4273 if (cxx_dialect > cxx98
4274 && decl_linkage (decl) != lk_none
4275 && !DECL_EXTERN_C_P (decl)
4276 && !DECL_ARTIFICIAL (decl)
4277 && !decl_defined_p (decl)
4278 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
4280 if (is_local_extern (decl))
4281 /* There's no way to define a local extern, and adding it to
4282 the vector interferes with GC, so give an error now. */
4283 no_linkage_error (decl);
4285 VEC_safe_push (tree, gc, no_linkage_decls, decl);
4288 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
4289 && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl))
4290 /* Remember it, so we can check it was defined. */
4291 note_vague_linkage_fn (decl);
4293 /* Is it a synthesized method that needs to be synthesized? */
4294 if (TREE_CODE (decl) == FUNCTION_DECL
4295 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
4296 && DECL_DEFAULTED_FN (decl)
4297 && ! DECL_INITIAL (decl))
4299 /* Remember the current location for a function we will end up
4300 synthesizing. Then we can inform the user where it was
4301 required in the case of error. */
4302 DECL_SOURCE_LOCATION (decl) = input_location;
4304 /* Synthesizing an implicitly defined member function will result in
4305 garbage collection. We must treat this situation as if we were
4306 within the body of a function so as to avoid collecting live data
4307 on the stack (such as overload resolution candidates).
4309 We could just let cp_write_global_declarations handle synthesizing
4310 this function, since we just added it to deferred_fns, but doing
4311 it at the use site produces better error messages. */
4313 synthesize_method (decl);
4315 /* If this is a synthesized method we don't need to
4316 do the instantiation test below. */
4318 else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4319 && DECL_TEMPLATE_INFO (decl)
4320 && (!DECL_EXPLICIT_INSTANTIATION (decl)
4321 || always_instantiate_p (decl)))
4322 /* If this is a function or variable that is an instance of some
4323 template, we now know that we will need to actually do the
4324 instantiation. We check that DECL is not an explicit
4325 instantiation because that is not checked in instantiate_decl.
4327 We put off instantiating functions in order to improve compile
4328 times. Maintaining a stack of active functions is expensive,
4329 and the inliner knows to instantiate any functions it might
4330 need. Therefore, we always try to defer instantiation. */
4331 instantiate_decl (decl, /*defer_ok=*/true,
4332 /*expl_inst_class_mem_p=*/false);
4335 #include "gt-cp-decl2.h"