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 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
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"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
55 extern cpp_reader *parse_in;
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
59 typedef struct priority_info_s {
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
62 int initializations_p;
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
68 static void mark_vtable_entries (tree);
69 static bool maybe_emit_vtables (tree);
70 static bool acceptable_java_type (tree);
71 static tree start_objects (int, int);
72 static void finish_objects (int, int, tree);
73 static tree start_static_storage_duration_function (unsigned);
74 static void finish_static_storage_duration_function (tree);
75 static priority_info get_priority_info (int);
76 static void do_static_initialization_or_destruction (tree, bool);
77 static void one_static_initialization_or_destruction (tree, tree, bool);
78 static void generate_ctor_or_dtor_function (bool, int, location_t *);
79 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
81 static tree prune_vars_needing_no_initialization (tree *);
82 static void write_out_vars (tree);
83 static void import_export_class (tree);
84 static tree get_guard_bits (tree);
85 static void determine_visibility_from_class (tree, tree);
87 /* A list of static class variables. This is needed, because a
88 static class variable can be declared inside the class without
89 an initializer, and then initialized, statically, outside the class. */
90 static GTY(()) VEC(tree,gc) *pending_statics;
92 /* A list of functions which were declared inline, but which we
93 may need to emit outline anyway. */
94 static GTY(()) VEC(tree,gc) *deferred_fns;
96 /* Nonzero if we're done parsing and into end-of-file activities. */
102 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
103 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
104 that apply to the function). */
107 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
112 if (fntype == error_mark_node || ctype == error_mark_node)
113 return error_mark_node;
115 type_quals = quals & ~TYPE_QUAL_RESTRICT;
116 ctype = cp_build_qualified_type (ctype, type_quals);
117 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
118 (TREE_CODE (fntype) == METHOD_TYPE
119 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
120 : TYPE_ARG_TYPES (fntype)));
121 raises = TYPE_RAISES_EXCEPTIONS (fntype);
123 fntype = build_exception_variant (fntype, raises);
128 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
132 cp_build_parm_decl (tree name, tree type)
134 tree parm = build_decl (PARM_DECL, name, type);
135 /* DECL_ARG_TYPE is only used by the back end and the back end never
137 if (!processing_template_decl)
138 DECL_ARG_TYPE (parm) = type_passed_as (type);
140 /* If the type is a pack expansion, then we have a function
142 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
143 FUNCTION_PARAMETER_PACK_P (parm) = 1;
148 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
152 build_artificial_parm (tree name, tree type)
154 tree parm = cp_build_parm_decl (name, type);
155 DECL_ARTIFICIAL (parm) = 1;
156 /* All our artificial parms are implicitly `const'; they cannot be
158 TREE_READONLY (parm) = 1;
162 /* Constructors for types with virtual baseclasses need an "in-charge" flag
163 saying whether this constructor is responsible for initialization of
164 virtual baseclasses or not. All destructors also need this "in-charge"
165 flag, which additionally determines whether or not the destructor should
166 free the memory for the object.
168 This function adds the "in-charge" flag to member function FN if
169 appropriate. It is called from grokclassfn and tsubst.
170 FN must be either a constructor or destructor.
172 The in-charge flag follows the 'this' parameter, and is followed by the
173 VTT parm (if any), then the user-written parms. */
176 maybe_retrofit_in_chrg (tree fn)
178 tree basetype, arg_types, parms, parm, fntype;
180 /* If we've already add the in-charge parameter don't do it again. */
181 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
184 /* When processing templates we can't know, in general, whether or
185 not we're going to have virtual baseclasses. */
186 if (processing_template_decl)
189 /* We don't need an in-charge parameter for constructors that don't
190 have virtual bases. */
191 if (DECL_CONSTRUCTOR_P (fn)
192 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
195 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
196 basetype = TREE_TYPE (TREE_VALUE (arg_types));
197 arg_types = TREE_CHAIN (arg_types);
199 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
201 /* If this is a subobject constructor or destructor, our caller will
202 pass us a pointer to our VTT. */
203 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
205 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
207 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
208 TREE_CHAIN (parm) = parms;
211 /* ...and then to TYPE_ARG_TYPES. */
212 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
214 DECL_HAS_VTT_PARM_P (fn) = 1;
217 /* Then add the in-charge parm (before the VTT parm). */
218 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
219 TREE_CHAIN (parm) = parms;
221 arg_types = hash_tree_chain (integer_type_node, arg_types);
223 /* Insert our new parameter(s) into the list. */
224 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
226 /* And rebuild the function type. */
227 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
229 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
230 fntype = build_exception_variant (fntype,
231 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
232 TREE_TYPE (fn) = fntype;
234 /* Now we've got the in-charge parameter. */
235 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
238 /* Classes overload their constituent function names automatically.
239 When a function name is declared in a record structure,
240 its name is changed to it overloaded name. Since names for
241 constructors and destructors can conflict, we place a leading
244 CNAME is the name of the class we are grokking for.
246 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
248 FLAGS contains bits saying what's special about today's
249 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
251 If FUNCTION is a destructor, then we must add the `auto-delete' field
252 as a second parameter. There is some hair associated with the fact
253 that we must "declare" this variable in the manner consistent with the
254 way the rest of the arguments were declared.
256 QUALS are the qualifiers for the this pointer. */
259 grokclassfn (tree ctype, tree function, enum overload_flags flags)
261 tree fn_name = DECL_NAME (function);
263 /* Even within an `extern "C"' block, members get C++ linkage. See
264 [dcl.link] for details. */
265 SET_DECL_LANGUAGE (function, lang_cplusplus);
267 if (fn_name == NULL_TREE)
269 error ("name missing for member function");
270 fn_name = get_identifier ("<anonymous>");
271 DECL_NAME (function) = fn_name;
274 DECL_CONTEXT (function) = ctype;
276 if (flags == DTOR_FLAG)
277 DECL_DESTRUCTOR_P (function) = 1;
279 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
280 maybe_retrofit_in_chrg (function);
283 /* Create an ARRAY_REF, checking for the user doing things backwards
287 grok_array_decl (tree array_expr, tree index_exp)
291 tree orig_array_expr = array_expr;
292 tree orig_index_exp = index_exp;
294 if (error_operand_p (array_expr) || error_operand_p (index_exp))
295 return error_mark_node;
297 if (processing_template_decl)
299 if (type_dependent_expression_p (array_expr)
300 || type_dependent_expression_p (index_exp))
301 return build_min_nt (ARRAY_REF, array_expr, index_exp,
302 NULL_TREE, NULL_TREE);
303 array_expr = build_non_dependent_expr (array_expr);
304 index_exp = build_non_dependent_expr (index_exp);
307 type = TREE_TYPE (array_expr);
309 type = non_reference (type);
311 /* If they have an `operator[]', use that. */
312 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
313 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
314 array_expr, index_exp, NULL_TREE,
315 /*overloaded_p=*/NULL);
320 /* Otherwise, create an ARRAY_REF for a pointer or array type.
321 It is a little-known fact that, if `a' is an array and `i' is
322 an int, you can write `i[a]', which means the same thing as
324 if (TREE_CODE (type) == ARRAY_TYPE)
327 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
329 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
332 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
334 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
336 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
339 if ((p1 && i2) && (i1 && p2))
340 error ("ambiguous conversion for array subscript");
343 array_expr = p1, index_exp = i2;
345 array_expr = p2, index_exp = i1;
348 error ("invalid types %<%T[%T]%> for array subscript",
349 type, TREE_TYPE (index_exp));
350 return error_mark_node;
353 if (array_expr == error_mark_node || index_exp == error_mark_node)
354 error ("ambiguous conversion for array subscript");
356 expr = build_array_ref (array_expr, index_exp);
358 if (processing_template_decl && expr != error_mark_node)
359 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
360 NULL_TREE, NULL_TREE);
364 /* Given the cast expression EXP, checking out its validity. Either return
365 an error_mark_node if there was an unavoidable error, return a cast to
366 void for trying to delete a pointer w/ the value 0, or return the
367 call to delete. If DOING_VEC is true, we handle things differently
368 for doing an array delete.
369 Implements ARM $5.3.4. This is called from the parser. */
372 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
376 if (exp == error_mark_node)
379 if (processing_template_decl)
381 t = build_min (DELETE_EXPR, void_type_node, exp, size);
382 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
383 DELETE_EXPR_USE_VEC (t) = doing_vec;
384 TREE_SIDE_EFFECTS (t) = 1;
388 /* An array can't have been allocated by new, so complain. */
389 if (TREE_CODE (exp) == VAR_DECL
390 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
391 warning (0, "deleting array %q#D", exp);
393 t = build_expr_type_conversion (WANT_POINTER, exp, true);
395 if (t == NULL_TREE || t == error_mark_node)
397 error ("type %q#T argument given to %<delete%>, expected pointer",
399 return error_mark_node;
402 type = TREE_TYPE (t);
404 /* As of Valley Forge, you can delete a pointer to const. */
406 /* You can't delete functions. */
407 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
409 error ("cannot delete a function. Only pointer-to-objects are "
410 "valid arguments to %<delete%>");
411 return error_mark_node;
414 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
415 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
417 warning (0, "deleting %qT is undefined", type);
421 /* Deleting a pointer with the value zero is valid and has no effect. */
422 if (integer_zerop (t))
423 return build1 (NOP_EXPR, void_type_node, t);
426 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
427 sfk_deleting_destructor,
430 return build_delete (type, t, sfk_deleting_destructor,
431 LOOKUP_NORMAL, use_global_delete);
434 /* Report an error if the indicated template declaration is not the
435 sort of thing that should be a member template. */
438 check_member_template (tree tmpl)
442 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
443 decl = DECL_TEMPLATE_RESULT (tmpl);
445 if (TREE_CODE (decl) == FUNCTION_DECL
446 || (TREE_CODE (decl) == TYPE_DECL
447 && IS_AGGR_TYPE (TREE_TYPE (decl))))
449 /* The parser rejects template declarations in local classes. */
450 gcc_assert (!current_function_decl);
451 /* The parser rejects any use of virtual in a function template. */
452 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
453 && DECL_VIRTUAL_P (decl)));
455 /* The debug-information generating code doesn't know what to do
456 with member templates. */
457 DECL_IGNORED_P (tmpl) = 1;
460 error ("template declaration of %q#D", decl);
463 /* Return true iff TYPE is a valid Java parameter or return type. */
466 acceptable_java_type (tree type)
468 if (type == error_mark_node)
471 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
473 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
475 type = TREE_TYPE (type);
476 if (TREE_CODE (type) == RECORD_TYPE)
479 if (! TYPE_FOR_JAVA (type))
481 if (! CLASSTYPE_TEMPLATE_INFO (type))
483 args = CLASSTYPE_TI_ARGS (type);
484 i = TREE_VEC_LENGTH (args);
487 type = TREE_VEC_ELT (args, i);
488 if (TREE_CODE (type) == POINTER_TYPE)
489 type = TREE_TYPE (type);
490 if (! TYPE_FOR_JAVA (type))
499 /* For a METHOD in a Java class CTYPE, return true if
500 the parameter and return types are valid Java types.
501 Otherwise, print appropriate error messages, and return false. */
504 check_java_method (tree method)
507 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
508 tree ret_type = TREE_TYPE (TREE_TYPE (method));
510 if (!acceptable_java_type (ret_type))
512 error ("Java method %qD has non-Java return type %qT",
517 arg_types = TREE_CHAIN (arg_types);
518 if (DECL_HAS_IN_CHARGE_PARM_P (method))
519 arg_types = TREE_CHAIN (arg_types);
520 if (DECL_HAS_VTT_PARM_P (method))
521 arg_types = TREE_CHAIN (arg_types);
523 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
525 tree type = TREE_VALUE (arg_types);
526 if (!acceptable_java_type (type))
528 if (type != error_mark_node)
529 error ("Java method %qD has non-Java parameter type %qT",
537 /* Sanity check: report error if this function FUNCTION is not
538 really a member of the class (CTYPE) it is supposed to belong to.
539 TEMPLATE_PARMS is used to specify the template parameters of a member
540 template passed as FUNCTION_DECL. If the member template is passed as a
541 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
542 from the declaration. If the function is not a function template, it
544 It returns the original declaration for the function, or NULL_TREE
545 if no declaration was found (and an error was emitted). */
548 check_classfn (tree ctype, tree function, tree template_parms)
554 if (DECL_USE_TEMPLATE (function)
555 && !(TREE_CODE (function) == TEMPLATE_DECL
556 && DECL_TEMPLATE_SPECIALIZATION (function))
557 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
558 /* Since this is a specialization of a member template,
559 we're not going to find the declaration in the class.
562 struct S { template <typename T> void f(T); };
563 template <> void S::f(int);
565 we're not going to find `S::f(int)', but there's no
566 reason we should, either. We let our callers know we didn't
567 find the method, but we don't complain. */
570 /* Basic sanity check: for a template function, the template parameters
571 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
572 if (TREE_CODE (function) == TEMPLATE_DECL)
574 gcc_assert (!template_parms
575 || comp_template_parms (template_parms,
576 DECL_TEMPLATE_PARMS (function)));
577 template_parms = DECL_TEMPLATE_PARMS (function);
580 /* OK, is this a definition of a member template? */
581 is_template = (template_parms != NULL_TREE);
583 /* We must enter the scope here, because conversion operators are
584 named by target type, and type equivalence relies on typenames
585 resolving within the scope of CTYPE. */
586 pushed_scope = push_scope (ctype);
587 ix = class_method_index_for_fn (complete_type (ctype), function);
590 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
591 tree fndecls, fndecl = 0;
593 const char *format = NULL;
595 for (fndecls = VEC_index (tree, methods, ix);
596 fndecls; fndecls = OVL_NEXT (fndecls))
600 fndecl = OVL_CURRENT (fndecls);
601 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
602 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
604 /* We cannot simply call decls_match because this doesn't
605 work for static member functions that are pretending to
606 be methods, and because the name may have been changed by
609 /* Get rid of the this parameter on functions that become
611 if (DECL_STATIC_FUNCTION_P (fndecl)
612 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
613 p1 = TREE_CHAIN (p1);
615 /* A member template definition only matches a member template
617 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
620 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
621 TREE_TYPE (TREE_TYPE (fndecl)))
622 && compparms (p1, p2)
624 || comp_template_parms (template_parms,
625 DECL_TEMPLATE_PARMS (fndecl)))
626 && (DECL_TEMPLATE_SPECIALIZATION (function)
627 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
628 && (!DECL_TEMPLATE_SPECIALIZATION (function)
629 || (DECL_TI_TEMPLATE (function)
630 == DECL_TI_TEMPLATE (fndecl))))
636 pop_scope (pushed_scope);
637 return OVL_CURRENT (fndecls);
640 error ("prototype for %q#D does not match any in class %qT",
642 is_conv_op = DECL_CONV_FN_P (fndecl);
645 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
646 fndecls = VEC_index (tree, methods, ix);
649 fndecl = OVL_CURRENT (fndecls);
650 fndecls = OVL_NEXT (fndecls);
652 if (!fndecls && is_conv_op)
654 if (VEC_length (tree, methods) > (size_t) ++ix)
656 fndecls = VEC_index (tree, methods, ix);
657 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
669 format = N_("candidates are: %+#D");
671 format = N_("candidate is: %+#D");
672 error (format, fndecl);
675 else if (!COMPLETE_TYPE_P (ctype))
676 cxx_incomplete_type_error (function, ctype);
678 error ("no %q#D member function declared in class %qT",
681 /* If we did not find the method in the class, add it to avoid
682 spurious errors (unless the CTYPE is not yet defined, in which
683 case we'll only confuse ourselves when the function is declared
684 properly within the class. */
685 if (COMPLETE_TYPE_P (ctype))
686 add_method (ctype, function, NULL_TREE);
689 pop_scope (pushed_scope);
693 /* DECL is a function with vague linkage. Remember it so that at the
694 end of the translation unit we can decide whether or not to emit
698 note_vague_linkage_fn (tree decl)
700 if (!DECL_DEFERRED_FN (decl))
702 DECL_DEFERRED_FN (decl) = 1;
703 DECL_DEFER_OUTPUT (decl) = 1;
704 VEC_safe_push (tree, gc, deferred_fns, decl);
708 /* We have just processed the DECL, which is a static data member.
709 The other parameters are as for cp_finish_decl. */
712 finish_static_data_member_decl (tree decl,
713 tree init, bool init_const_expr_p,
717 DECL_CONTEXT (decl) = current_class_type;
719 /* We cannot call pushdecl here, because that would fill in the
720 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
721 the right thing, namely, to put this decl out straight away. */
723 if (! processing_template_decl)
724 VEC_safe_push (tree, gc, pending_statics, decl);
726 if (LOCAL_CLASS_P (current_class_type))
727 pedwarn ("local class %q#T shall not have static data member %q#D",
728 current_class_type, decl);
730 /* Static consts need not be initialized in the class definition. */
731 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
733 static int explained = 0;
735 error ("initializer invalid for static member with constructor");
738 error ("(an out of class initialization is required)");
743 /* Force the compiler to know when an uninitialized static const
744 member is being used. */
745 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
746 TREE_USED (decl) = 1;
747 DECL_INITIAL (decl) = init;
748 DECL_IN_AGGR_P (decl) = 1;
750 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
753 /* DECLARATOR and DECLSPECS correspond to a class member. The other
754 parameters are as for cp_finish_decl. Return the DECL for the
755 class member declared. */
758 grokfield (const cp_declarator *declarator,
759 cp_decl_specifier_seq *declspecs,
760 tree init, bool init_const_expr_p,
765 const char *asmspec = 0;
766 int flags = LOOKUP_ONLYCONVERTING;
769 && TREE_CODE (init) == TREE_LIST
770 && TREE_VALUE (init) == error_mark_node
771 && TREE_CHAIN (init) == NULL_TREE)
774 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
775 if (! value || error_operand_p (value))
776 /* friend or constructor went bad. */
777 return error_mark_node;
779 if (TREE_CODE (value) == TYPE_DECL && init)
781 error ("typedef %qD is initialized (use __typeof__ instead)", value);
785 /* Pass friendly classes back. */
786 if (value == void_type_node)
789 /* Pass friend decls back. */
790 if ((TREE_CODE (value) == FUNCTION_DECL
791 || TREE_CODE (value) == TEMPLATE_DECL)
792 && DECL_CONTEXT (value) != current_class_type)
795 if (DECL_NAME (value) != NULL_TREE
796 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
797 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
798 error ("member %qD conflicts with virtual function table field name",
801 /* Stash away type declarations. */
802 if (TREE_CODE (value) == TYPE_DECL)
804 DECL_NONLOCAL (value) = 1;
805 DECL_CONTEXT (value) = current_class_type;
807 if (processing_template_decl)
808 value = push_template_decl (value);
812 /* Avoid storing attributes in template parameters:
813 tsubst is not ready to handle them. */
814 tree type = TREE_TYPE (value);
815 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
816 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
817 sorry ("applying attributes to template parameters is not implemented");
819 cplus_decl_attributes (&value, attrlist, 0);
825 if (DECL_IN_AGGR_P (value))
827 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
828 return void_type_node;
831 if (asmspec_tree && asmspec_tree != error_mark_node)
832 asmspec = TREE_STRING_POINTER (asmspec_tree);
836 if (TREE_CODE (value) == FUNCTION_DECL)
838 /* Initializers for functions are rejected early in the parser.
839 If we get here, it must be a pure specifier for a method. */
840 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
842 gcc_assert (error_operand_p (init) || integer_zerop (init));
843 DECL_PURE_VIRTUAL_P (value) = 1;
847 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
848 error ("initializer specified for static member function %qD",
852 else if (pedantic && TREE_CODE (value) != VAR_DECL)
853 /* Already complained in grokdeclarator. */
855 else if (!processing_template_decl)
857 if (TREE_CODE (init) == CONSTRUCTOR)
858 init = digest_init (TREE_TYPE (value), init);
860 init = integral_constant_value (init);
862 if (init != error_mark_node && !TREE_CONSTANT (init))
864 /* We can allow references to things that are effectively
865 static, since references are initialized with the
867 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
868 || (TREE_STATIC (init) == 0
869 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
871 error ("field initializer is not constant");
872 init = error_mark_node;
878 if (processing_template_decl
879 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
881 value = push_template_decl (value);
882 if (error_operand_p (value))
883 return error_mark_node;
887 cplus_decl_attributes (&value, attrlist, 0);
889 switch (TREE_CODE (value))
892 finish_static_data_member_decl (value, init, init_const_expr_p,
893 asmspec_tree, flags);
898 error ("%<asm%> specifiers are not permitted on non-static data members");
899 if (DECL_INITIAL (value) == error_mark_node)
900 init = error_mark_node;
901 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
903 DECL_INITIAL (value) = init;
904 DECL_IN_AGGR_P (value) = 1;
909 set_user_assembler_name (value, asmspec);
911 cp_finish_decl (value,
913 /*init_const_expr_p=*/false,
914 asmspec_tree, flags);
916 /* Pass friends back this way. */
917 if (DECL_FRIEND_P (value))
918 return void_type_node;
920 DECL_IN_AGGR_P (value) = 1;
929 /* Like `grokfield', but for bitfields.
930 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
933 grokbitfield (const cp_declarator *declarator,
934 cp_decl_specifier_seq *declspecs, tree width)
936 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
938 if (value == error_mark_node)
939 return NULL_TREE; /* friends went bad. */
941 /* Pass friendly classes back. */
942 if (TREE_CODE (value) == VOID_TYPE)
943 return void_type_node;
945 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
946 && (POINTER_TYPE_P (value)
947 || !dependent_type_p (TREE_TYPE (value))))
949 error ("bit-field %qD with non-integral type", value);
950 return error_mark_node;
953 if (TREE_CODE (value) == TYPE_DECL)
955 error ("cannot declare %qD to be a bit-field type", value);
959 /* Usually, finish_struct_1 catches bitfields with invalid types.
960 But, in the case of bitfields with function type, we confuse
961 ourselves into thinking they are member functions, so we must
963 if (TREE_CODE (value) == FUNCTION_DECL)
965 error ("cannot declare bit-field %qD with function type",
970 if (DECL_IN_AGGR_P (value))
972 error ("%qD is already defined in the class %qT", value,
973 DECL_CONTEXT (value));
974 return void_type_node;
977 if (TREE_STATIC (value))
979 error ("static member %qD cannot be a bit-field", value);
982 finish_decl (value, NULL_TREE, NULL_TREE);
984 if (width != error_mark_node)
986 constant_expression_warning (width);
987 DECL_INITIAL (value) = width;
988 SET_DECL_C_BIT_FIELD (value);
991 DECL_IN_AGGR_P (value) = 1;
997 cplus_decl_attributes (tree *decl, tree attributes, int flags)
999 if (*decl == NULL_TREE || *decl == void_type_node
1000 || *decl == error_mark_node)
1003 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1004 decl = &DECL_TEMPLATE_RESULT (*decl);
1006 decl_attributes (decl, attributes, flags);
1008 if (TREE_CODE (*decl) == TYPE_DECL)
1009 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1012 /* Walks through the namespace- or function-scope anonymous union
1013 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1014 Returns one of the fields for use in the mangled name. */
1017 build_anon_union_vars (tree type, tree object)
1019 tree main_decl = NULL_TREE;
1022 /* Rather than write the code to handle the non-union case,
1023 just give an error. */
1024 if (TREE_CODE (type) != UNION_TYPE)
1025 error ("anonymous struct not inside named type");
1027 for (field = TYPE_FIELDS (type);
1029 field = TREE_CHAIN (field))
1034 if (DECL_ARTIFICIAL (field))
1036 if (TREE_CODE (field) != FIELD_DECL)
1038 pedwarn ("%q+#D invalid; an anonymous union can only "
1039 "have non-static data members", field);
1043 if (TREE_PRIVATE (field))
1044 pedwarn ("private member %q+#D in anonymous union", field);
1045 else if (TREE_PROTECTED (field))
1046 pedwarn ("protected member %q+#D in anonymous union", field);
1048 if (processing_template_decl)
1049 ref = build_min_nt (COMPONENT_REF, object,
1050 DECL_NAME (field), NULL_TREE);
1052 ref = build_class_member_access_expr (object, field, NULL_TREE,
1055 if (DECL_NAME (field))
1059 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1060 DECL_ANON_UNION_VAR_P (decl) = 1;
1062 base = get_base_address (object);
1063 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1064 TREE_STATIC (decl) = TREE_STATIC (base);
1065 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1067 SET_DECL_VALUE_EXPR (decl, ref);
1068 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1070 decl = pushdecl (decl);
1072 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1073 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1077 if (main_decl == NULL_TREE)
1084 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1085 anonymous union, then all members must be laid out together. PUBLIC_P
1086 is nonzero if this union is not declared static. */
1089 finish_anon_union (tree anon_union_decl)
1095 if (anon_union_decl == error_mark_node)
1098 type = TREE_TYPE (anon_union_decl);
1099 public_p = TREE_PUBLIC (anon_union_decl);
1101 /* The VAR_DECL's context is the same as the TYPE's context. */
1102 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1104 if (TYPE_FIELDS (type) == NULL_TREE)
1109 error ("namespace-scope anonymous aggregates must be static");
1113 main_decl = build_anon_union_vars (type, anon_union_decl);
1114 if (main_decl == error_mark_node)
1116 if (main_decl == NULL_TREE)
1118 warning (0, "anonymous union with no members");
1122 if (!processing_template_decl)
1124 /* Use main_decl to set the mangled name. */
1125 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1126 mangle_decl (anon_union_decl);
1127 DECL_NAME (anon_union_decl) = NULL_TREE;
1130 pushdecl (anon_union_decl);
1131 if (building_stmt_tree ()
1132 && at_function_scope_p ())
1133 add_decl_expr (anon_union_decl);
1134 else if (!processing_template_decl)
1135 rest_of_decl_compilation (anon_union_decl,
1136 toplevel_bindings_p (), at_eof);
1139 /* Auxiliary functions to make type signatures for
1140 `operator new' and `operator delete' correspond to
1141 what compiler will be expecting. */
1144 coerce_new_type (tree type)
1147 tree args = TYPE_ARG_TYPES (type);
1149 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1151 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1154 error ("%<operator new%> must return type %qT", ptr_type_node);
1157 if (!args || args == void_list_node
1158 || !same_type_p (TREE_VALUE (args), size_type_node))
1161 if (args && args != void_list_node)
1162 args = TREE_CHAIN (args);
1163 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1164 "as first parameter", size_type_node);
1169 args = tree_cons (NULL_TREE, size_type_node, args);
1172 type = build_exception_variant
1173 (build_function_type (ptr_type_node, args),
1174 TYPE_RAISES_EXCEPTIONS (type));
1182 coerce_delete_type (tree type)
1185 tree args = TYPE_ARG_TYPES (type);
1187 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1189 if (!same_type_p (TREE_TYPE (type), void_type_node))
1192 error ("%<operator delete%> must return type %qT", void_type_node);
1195 if (!args || args == void_list_node
1196 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1199 if (args && args != void_list_node)
1200 args = TREE_CHAIN (args);
1201 error ("%<operator delete%> takes type %qT as first parameter",
1207 args = tree_cons (NULL_TREE, ptr_type_node, args);
1210 type = build_exception_variant
1211 (build_function_type (void_type_node, args),
1212 TYPE_RAISES_EXCEPTIONS (type));
1221 mark_vtable_entries (tree decl)
1224 unsigned HOST_WIDE_INT idx;
1226 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1231 STRIP_NOPS (fnaddr);
1233 if (TREE_CODE (fnaddr) != ADDR_EXPR
1234 && TREE_CODE (fnaddr) != FDESC_EXPR)
1235 /* This entry is an offset: a virtual base class offset, a
1236 virtual call offset, an RTTI offset, etc. */
1239 fn = TREE_OPERAND (fnaddr, 0);
1240 TREE_ADDRESSABLE (fn) = 1;
1241 /* When we don't have vcall offsets, we output thunks whenever
1242 we output the vtables that contain them. With vcall offsets,
1243 we know all the thunks we'll need when we emit a virtual
1244 function, so we emit the thunks there instead. */
1245 if (DECL_THUNK_P (fn))
1246 use_thunk (fn, /*emit_p=*/0);
1251 /* Set DECL up to have the closest approximation of "initialized common"
1252 linkage available. */
1255 comdat_linkage (tree decl)
1258 make_decl_one_only (decl);
1259 else if (TREE_CODE (decl) == FUNCTION_DECL
1260 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1261 /* We can just emit function and compiler-generated variables
1262 statically; having multiple copies is (for the most part) only
1265 There are two correctness issues, however: the address of a
1266 template instantiation with external linkage should be the
1267 same, independent of what translation unit asks for the
1268 address, and this will not hold when we emit multiple copies of
1269 the function. However, there's little else we can do.
1271 Also, by default, the typeinfo implementation assumes that
1272 there will be only one copy of the string used as the name for
1273 each type. Therefore, if weak symbols are unavailable, the
1274 run-time library should perform a more conservative check; it
1275 should perform a string comparison, rather than an address
1277 TREE_PUBLIC (decl) = 0;
1280 /* Static data member template instantiations, however, cannot
1281 have multiple copies. */
1282 if (DECL_INITIAL (decl) == 0
1283 || DECL_INITIAL (decl) == error_mark_node)
1284 DECL_COMMON (decl) = 1;
1285 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1287 DECL_COMMON (decl) = 1;
1288 DECL_INITIAL (decl) = error_mark_node;
1290 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1292 /* We can't do anything useful; leave vars for explicit
1294 DECL_EXTERNAL (decl) = 1;
1295 DECL_NOT_REALLY_EXTERN (decl) = 0;
1299 if (DECL_LANG_SPECIFIC (decl))
1300 DECL_COMDAT (decl) = 1;
1303 /* For win32 we also want to put explicit instantiations in
1304 linkonce sections, so that they will be merged with implicit
1305 instantiations; otherwise we get duplicate symbol errors.
1306 For Darwin we do not want explicit instantiations to be
1310 maybe_make_one_only (tree decl)
1312 /* We used to say that this was not necessary on targets that support weak
1313 symbols, because the implicit instantiations will defer to the explicit
1314 one. However, that's not actually the case in SVR4; a strong definition
1315 after a weak one is an error. Also, not making explicit
1316 instantiations one_only means that we can end up with two copies of
1317 some template instantiations. */
1321 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1322 we can get away with not emitting them if they aren't used. We need
1323 to for variables so that cp_finish_decl will update their linkage,
1324 because their DECL_INITIAL may not have been set properly yet. */
1326 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1327 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1328 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1330 make_decl_one_only (decl);
1332 if (TREE_CODE (decl) == VAR_DECL)
1334 DECL_COMDAT (decl) = 1;
1335 /* Mark it needed so we don't forget to emit it. */
1336 mark_decl_referenced (decl);
1341 /* Determine whether or not we want to specifically import or export CTYPE,
1342 using various heuristics. */
1345 import_export_class (tree ctype)
1347 /* -1 for imported, 1 for exported. */
1348 int import_export = 0;
1350 /* It only makes sense to call this function at EOF. The reason is
1351 that this function looks at whether or not the first non-inline
1352 non-abstract virtual member function has been defined in this
1353 translation unit. But, we can't possibly know that until we've
1354 seen the entire translation unit. */
1355 gcc_assert (at_eof);
1357 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1360 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1361 we will have CLASSTYPE_INTERFACE_ONLY set but not
1362 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1363 heuristic because someone will supply a #pragma implementation
1364 elsewhere, and deducing it here would produce a conflict. */
1365 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1368 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1370 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1372 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1373 && !flag_implicit_templates)
1374 /* For a template class, without -fimplicit-templates, check the
1375 repository. If the virtual table is assigned to this
1376 translation unit, then export the class; otherwise, import
1378 import_export = repo_export_class_p (ctype) ? 1 : -1;
1379 else if (TYPE_POLYMORPHIC_P (ctype))
1381 /* The ABI specifies that the virtual table and associated
1382 information are emitted with the key method, if any. */
1383 tree method = CLASSTYPE_KEY_METHOD (ctype);
1384 /* If weak symbol support is not available, then we must be
1385 careful not to emit the vtable when the key function is
1386 inline. An inline function can be defined in multiple
1387 translation units. If we were to emit the vtable in each
1388 translation unit containing a definition, we would get
1389 multiple definition errors at link-time. */
1390 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1391 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1394 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1395 a definition anywhere else. */
1396 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1399 /* Allow back ends the chance to overrule the decision. */
1400 if (targetm.cxx.import_export_class)
1401 import_export = targetm.cxx.import_export_class (ctype, import_export);
1405 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1406 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1410 /* Return true if VAR has already been provided to the back end; in that
1411 case VAR should not be modified further by the front end. */
1413 var_finalized_p (tree var)
1415 return varpool_node (var)->finalized;
1418 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1419 must be emitted in this translation unit. Mark it as such. */
1422 mark_needed (tree decl)
1424 /* It's possible that we no longer need to set
1425 TREE_SYMBOL_REFERENCED here directly, but doing so is
1427 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1428 mark_decl_referenced (decl);
1431 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1432 returns true if a definition of this entity should be provided in
1433 this object file. Callers use this function to determine whether
1434 or not to let the back end know that a definition of DECL is
1435 available in this translation unit. */
1438 decl_needed_p (tree decl)
1440 gcc_assert (TREE_CODE (decl) == VAR_DECL
1441 || TREE_CODE (decl) == FUNCTION_DECL);
1442 /* This function should only be called at the end of the translation
1443 unit. We cannot be sure of whether or not something will be
1444 COMDAT until that point. */
1445 gcc_assert (at_eof);
1447 /* All entities with external linkage that are not COMDAT should be
1448 emitted; they may be referred to from other object files. */
1449 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1451 /* If this entity was used, let the back end see it; it will decide
1452 whether or not to emit it into the object file. */
1453 if (TREE_USED (decl)
1454 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1455 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1457 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1458 reference to DECL might cause it to be emitted later. */
1462 /* If necessary, write out the vtables for the dynamic class CTYPE.
1463 Returns true if any vtables were emitted. */
1466 maybe_emit_vtables (tree ctype)
1472 /* If the vtables for this class have already been emitted there is
1473 nothing more to do. */
1474 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1475 if (var_finalized_p (primary_vtbl))
1477 /* Ignore dummy vtables made by get_vtable_decl. */
1478 if (TREE_TYPE (primary_vtbl) == void_type_node)
1481 /* On some targets, we cannot determine the key method until the end
1482 of the translation unit -- which is when this function is
1484 if (!targetm.cxx.key_method_may_be_inline ())
1485 determine_key_method (ctype);
1487 /* See if any of the vtables are needed. */
1488 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1490 import_export_decl (vtbl);
1491 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1496 /* If the references to this class' vtables are optimized away,
1497 still emit the appropriate debugging information. See
1499 if (DECL_COMDAT (primary_vtbl)
1500 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1501 note_debug_info_needed (ctype);
1505 /* The ABI requires that we emit all of the vtables if we emit any
1507 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1509 /* Mark entities references from the virtual table as used. */
1510 mark_vtable_entries (vtbl);
1512 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1514 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1516 /* It had better be all done at compile-time. */
1521 DECL_EXTERNAL (vtbl) = 0;
1522 rest_of_decl_compilation (vtbl, 1, 1);
1524 /* Because we're only doing syntax-checking, we'll never end up
1525 actually marking the variable as written. */
1526 if (flag_syntax_only)
1527 TREE_ASM_WRITTEN (vtbl) = 1;
1530 /* Since we're writing out the vtable here, also write the debug
1532 note_debug_info_needed (ctype);
1537 /* A special return value from type_visibility meaning internal
1540 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1542 /* walk_tree helper function for type_visibility. */
1545 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1547 int *vis_p = (int *)data;
1552 else if (CLASS_TYPE_P (*tp))
1554 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1556 *vis_p = VISIBILITY_ANON;
1559 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1560 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1565 /* Returns the visibility of TYPE, which is the minimum visibility of its
1569 type_visibility (tree type)
1571 int vis = VISIBILITY_DEFAULT;
1572 walk_tree_without_duplicates (&type, min_vis_r, &vis);
1576 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1577 specified (or if VISIBILITY is static). */
1580 constrain_visibility (tree decl, int visibility)
1582 if (visibility == VISIBILITY_ANON)
1584 /* extern "C" declarations aren't affected by the anonymous
1586 if (!DECL_EXTERN_C_P (decl))
1588 TREE_PUBLIC (decl) = 0;
1589 DECL_INTERFACE_KNOWN (decl) = 1;
1590 if (DECL_LANG_SPECIFIC (decl))
1591 DECL_NOT_REALLY_EXTERN (decl) = 1;
1594 else if (visibility > DECL_VISIBILITY (decl)
1595 && !DECL_VISIBILITY_SPECIFIED (decl))
1597 DECL_VISIBILITY (decl) = visibility;
1603 /* Constrain the visibility of DECL based on the visibility of its template
1607 constrain_visibility_for_template (tree decl, tree targs)
1609 /* If this is a template instantiation, check the innermost
1610 template args for visibility constraints. The outer template
1611 args are covered by the class check. */
1612 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1614 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1618 tree arg = TREE_VEC_ELT (args, i-1);
1620 vis = type_visibility (arg);
1621 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1624 if (TREE_CODE (arg) == ADDR_EXPR)
1625 arg = TREE_OPERAND (arg, 0);
1626 if (TREE_CODE (arg) == VAR_DECL
1627 || TREE_CODE (arg) == FUNCTION_DECL)
1629 if (! TREE_PUBLIC (arg))
1630 vis = VISIBILITY_ANON;
1632 vis = DECL_VISIBILITY (arg);
1636 constrain_visibility (decl, vis);
1640 /* Like c_determine_visibility, but with additional C++-specific
1643 Function-scope entities can rely on the function's visibility because
1644 it is set in start_preparsed_function.
1646 Class-scope entities cannot rely on the class's visibility until the end
1647 of the enclosing class definition.
1649 Note that because namespaces have multiple independent definitions,
1650 namespace visibility is handled elsewhere using the #pragma visibility
1651 machinery rather than by decorating the namespace declaration.
1653 The goal is for constraints from the type to give a diagnostic, and
1654 other constraints to be applied silently. */
1657 determine_visibility (tree decl)
1659 tree class_type = NULL_TREE;
1662 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1664 /* Only relevant for names with external linkage. */
1665 if (!TREE_PUBLIC (decl))
1668 /* Cloned constructors and destructors get the same visibility as
1669 the underlying function. That should be set up in
1670 maybe_clone_body. */
1671 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1673 if (TREE_CODE (decl) == TYPE_DECL)
1675 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1676 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1677 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1682 else if (DECL_LANG_SPECIFIC (decl))
1683 use_template = DECL_USE_TEMPLATE (decl);
1687 /* If DECL is a member of a class, visibility specifiers on the
1688 class can influence the visibility of the DECL. */
1689 if (DECL_CLASS_SCOPE_P (decl))
1690 class_type = DECL_CONTEXT (decl);
1693 /* Not a class member. */
1695 /* Virtual tables have DECL_CONTEXT set to their associated class,
1696 so they are automatically handled above. */
1697 gcc_assert (TREE_CODE (decl) != VAR_DECL
1698 || !DECL_VTABLE_OR_VTT_P (decl));
1700 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1702 /* Local statics and classes get the visibility of their
1703 containing function by default, except that
1704 -fvisibility-inlines-hidden doesn't affect them. */
1705 tree fn = DECL_CONTEXT (decl);
1706 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1708 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1709 DECL_VISIBILITY_SPECIFIED (decl) =
1710 DECL_VISIBILITY_SPECIFIED (fn);
1713 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1715 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1716 but have no TEMPLATE_INFO, so don't try to check it. */
1719 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1720 && flag_visibility_ms_compat)
1722 /* Under -fvisibility-ms-compat, types are visible by default,
1723 even though their contents aren't. */
1724 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1725 int underlying_vis = type_visibility (underlying_type);
1726 if (underlying_vis == VISIBILITY_ANON
1727 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1728 constrain_visibility (decl, underlying_vis);
1730 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1732 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1734 /* tinfo visibility is based on the type it's for. */
1735 constrain_visibility
1736 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1738 else if (use_template)
1739 /* Template instantiations and specializations get visibility based
1740 on their template unless they override it with an attribute. */;
1741 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1743 /* Set default visibility to whatever the user supplied with
1744 #pragma GCC visibility or a namespace visibility attribute. */
1745 DECL_VISIBILITY (decl) = default_visibility;
1746 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1752 /* If the specialization doesn't specify visibility, use the
1753 visibility from the template. */
1754 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1755 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1756 : DECL_TEMPLATE_INFO (decl));
1757 tree args = TI_ARGS (tinfo);
1759 if (args != error_mark_node)
1761 int depth = TMPL_ARGS_DEPTH (args);
1762 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1764 if (!DECL_VISIBILITY_SPECIFIED (decl))
1766 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1767 DECL_VISIBILITY_SPECIFIED (decl)
1768 = DECL_VISIBILITY_SPECIFIED (pattern);
1771 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1772 if (args && depth > template_class_depth (class_type))
1773 /* Limit visibility based on its template arguments. */
1774 constrain_visibility_for_template (decl, args);
1779 determine_visibility_from_class (decl, class_type);
1781 if (decl_anon_ns_mem_p (decl))
1782 /* Names in an anonymous namespace get internal linkage.
1783 This might change once we implement export. */
1784 constrain_visibility (decl, VISIBILITY_ANON);
1785 else if (TREE_CODE (decl) != TYPE_DECL)
1787 /* Propagate anonymity from type to decl. */
1788 int tvis = type_visibility (TREE_TYPE (decl));
1789 if (tvis == VISIBILITY_ANON
1790 || ! DECL_VISIBILITY_SPECIFIED (decl))
1791 constrain_visibility (decl, tvis);
1795 /* By default, static data members and function members receive
1796 the visibility of their containing class. */
1799 determine_visibility_from_class (tree decl, tree class_type)
1801 if (DECL_VISIBILITY_SPECIFIED (decl))
1804 if (visibility_options.inlines_hidden
1805 /* Don't do this for inline templates; specializations might not be
1806 inline, and we don't want them to inherit the hidden
1807 visibility. We'll set it here for all inline instantiations. */
1808 && !processing_template_decl
1809 && TREE_CODE (decl) == FUNCTION_DECL
1810 && DECL_DECLARED_INLINE_P (decl)
1811 && (! DECL_LANG_SPECIFIC (decl)
1812 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1813 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1816 /* Default to the class visibility. */
1817 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1818 DECL_VISIBILITY_SPECIFIED (decl)
1819 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1822 /* Give the target a chance to override the visibility associated
1824 if (TREE_CODE (decl) == VAR_DECL
1825 && (DECL_TINFO_P (decl)
1826 || (DECL_VTABLE_OR_VTT_P (decl)
1827 /* Construction virtual tables are not exported because
1828 they cannot be referred to from other object files;
1829 their name is not standardized by the ABI. */
1830 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1831 && TREE_PUBLIC (decl)
1832 && !DECL_REALLY_EXTERN (decl)
1833 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1834 targetm.cxx.determine_class_data_visibility (decl);
1837 /* Constrain the visibility of a class TYPE based on the visibility of its
1838 field types. Warn if any fields require lesser visibility. */
1841 constrain_class_visibility (tree type)
1847 int vis = type_visibility (type);
1849 if (vis == VISIBILITY_ANON
1850 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
1853 /* Don't warn about visibility if the class has explicit visibility. */
1854 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
1855 vis = VISIBILITY_INTERNAL;
1857 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1858 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
1860 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
1861 int subvis = type_visibility (ftype);
1863 if (subvis == VISIBILITY_ANON)
1865 if (strcmp (main_input_filename,
1866 DECL_SOURCE_FILE (TYPE_MAIN_DECL (ftype))))
1868 %qT has a field %qD whose type uses the anonymous namespace",
1871 else if (IS_AGGR_TYPE (ftype)
1872 && vis < VISIBILITY_HIDDEN
1873 && subvis >= VISIBILITY_HIDDEN)
1874 warning (OPT_Wattributes, "\
1875 %qT declared with greater visibility than the type of its field %qD",
1879 binfo = TYPE_BINFO (type);
1880 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1882 int subvis = type_visibility (TREE_TYPE (t));
1884 if (subvis == VISIBILITY_ANON)
1886 if (strcmp (main_input_filename,
1887 DECL_SOURCE_FILE (TYPE_MAIN_DECL (TREE_TYPE (t)))))
1889 %qT has a base %qT whose type uses the anonymous namespace",
1890 type, TREE_TYPE (t));
1892 else if (vis < VISIBILITY_HIDDEN
1893 && subvis >= VISIBILITY_HIDDEN)
1894 warning (OPT_Wattributes, "\
1895 %qT declared with greater visibility than its base %qT",
1896 type, TREE_TYPE (t));
1900 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1901 for DECL has not already been determined, do so now by setting
1902 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1903 function is called entities with vague linkage whose definitions
1904 are available must have TREE_PUBLIC set.
1906 If this function decides to place DECL in COMDAT, it will set
1907 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1908 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1909 callers defer that decision until it is clear that DECL is actually
1913 import_export_decl (tree decl)
1918 tree class_type = NULL_TREE;
1920 if (DECL_INTERFACE_KNOWN (decl))
1923 /* We cannot determine what linkage to give to an entity with vague
1924 linkage until the end of the file. For example, a virtual table
1925 for a class will be defined if and only if the key method is
1926 defined in this translation unit. As a further example, consider
1927 that when compiling a translation unit that uses PCH file with
1928 "-frepo" it would be incorrect to make decisions about what
1929 entities to emit when building the PCH; those decisions must be
1930 delayed until the repository information has been processed. */
1931 gcc_assert (at_eof);
1932 /* Object file linkage for explicit instantiations is handled in
1933 mark_decl_instantiated. For static variables in functions with
1934 vague linkage, maybe_commonize_var is used.
1936 Therefore, the only declarations that should be provided to this
1937 function are those with external linkage that are:
1939 * implicit instantiations of function templates
1943 * implicit instantiations of static data members of class
1950 Furthermore, all entities that reach this point must have a
1951 definition available in this translation unit.
1953 The following assertions check these conditions. */
1954 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1955 || TREE_CODE (decl) == VAR_DECL);
1956 /* Any code that creates entities with TREE_PUBLIC cleared should
1957 also set DECL_INTERFACE_KNOWN. */
1958 gcc_assert (TREE_PUBLIC (decl));
1959 if (TREE_CODE (decl) == FUNCTION_DECL)
1960 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1961 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1962 || DECL_DECLARED_INLINE_P (decl));
1964 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1965 || DECL_VTABLE_OR_VTT_P (decl)
1966 || DECL_TINFO_P (decl));
1967 /* Check that a definition of DECL is available in this translation
1969 gcc_assert (!DECL_REALLY_EXTERN (decl));
1971 /* Assume that DECL will not have COMDAT linkage. */
1973 /* Assume that DECL will not be imported into this translation
1977 /* See if the repository tells us whether or not to emit DECL in
1978 this translation unit. */
1979 emit_p = repo_emit_p (decl);
1982 else if (emit_p == 1)
1984 /* The repository indicates that this entity should be defined
1985 here. Make sure the back end honors that request. */
1986 if (TREE_CODE (decl) == VAR_DECL)
1988 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1989 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1992 FOR_EACH_CLONE (clone, decl)
1993 mark_needed (clone);
1997 /* Output the definition as an ordinary strong definition. */
1998 DECL_EXTERNAL (decl) = 0;
1999 DECL_INTERFACE_KNOWN (decl) = 1;
2004 /* We have already decided what to do with this DECL; there is no
2005 need to check anything further. */
2007 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2009 class_type = DECL_CONTEXT (decl);
2010 import_export_class (class_type);
2011 if (TYPE_FOR_JAVA (class_type))
2013 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2014 && CLASSTYPE_INTERFACE_ONLY (class_type))
2016 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2017 && !CLASSTYPE_USE_TEMPLATE (class_type)
2018 && CLASSTYPE_KEY_METHOD (class_type)
2019 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2020 /* The ABI requires that all virtual tables be emitted with
2021 COMDAT linkage. However, on systems where COMDAT symbols
2022 don't show up in the table of contents for a static
2023 archive, or on systems without weak symbols (where we
2024 approximate COMDAT linkage by using internal linkage), the
2025 linker will report errors about undefined symbols because
2026 it will not see the virtual table definition. Therefore,
2027 in the case that we know that the virtual table will be
2028 emitted in only one translation unit, we make the virtual
2029 table an ordinary definition with external linkage. */
2030 DECL_EXTERNAL (decl) = 0;
2031 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2033 /* CLASS_TYPE is being exported from this translation unit,
2034 so DECL should be defined here. */
2035 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2036 /* If a class is declared in a header with the "extern
2037 template" extension, then it will not be instantiated,
2038 even in translation units that would normally require
2039 it. Often such classes are explicitly instantiated in
2040 one translation unit. Therefore, the explicit
2041 instantiation must be made visible to other translation
2043 DECL_EXTERNAL (decl) = 0;
2046 /* The generic C++ ABI says that class data is always
2047 COMDAT, even if there is a key function. Some
2048 variants (e.g., the ARM EABI) says that class data
2049 only has COMDAT linkage if the class data might be
2050 emitted in more than one translation unit. When the
2051 key method can be inline and is inline, we still have
2052 to arrange for comdat even though
2053 class_data_always_comdat is false. */
2054 if (!CLASSTYPE_KEY_METHOD (class_type)
2055 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2056 || targetm.cxx.class_data_always_comdat ())
2058 /* The ABI requires COMDAT linkage. Normally, we
2059 only emit COMDAT things when they are needed;
2060 make sure that we realize that this entity is
2067 else if (!flag_implicit_templates
2068 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2073 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2075 tree type = TREE_TYPE (DECL_NAME (decl));
2076 if (CLASS_TYPE_P (type))
2079 import_export_class (type);
2080 if (CLASSTYPE_INTERFACE_KNOWN (type)
2081 && TYPE_POLYMORPHIC_P (type)
2082 && CLASSTYPE_INTERFACE_ONLY (type)
2083 /* If -fno-rtti was specified, then we cannot be sure
2084 that RTTI information will be emitted with the
2085 virtual table of the class, so we must emit it
2086 wherever it is used. */
2091 if (CLASSTYPE_INTERFACE_KNOWN (type)
2092 && !CLASSTYPE_INTERFACE_ONLY (type))
2094 comdat_p = (targetm.cxx.class_data_always_comdat ()
2095 || (CLASSTYPE_KEY_METHOD (type)
2096 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2101 DECL_EXTERNAL (decl) = 0;
2111 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2112 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2114 /* DECL is an implicit instantiation of a function or static
2116 if (flag_implicit_templates
2117 || (flag_implicit_inline_templates
2118 && TREE_CODE (decl) == FUNCTION_DECL
2119 && DECL_DECLARED_INLINE_P (decl)))
2122 /* If we are not implicitly generating templates, then mark
2123 this entity as undefined in this translation unit. */
2126 else if (DECL_FUNCTION_MEMBER_P (decl))
2128 if (!DECL_DECLARED_INLINE_P (decl))
2130 tree ctype = DECL_CONTEXT (decl);
2131 import_export_class (ctype);
2132 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2134 DECL_NOT_REALLY_EXTERN (decl)
2135 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2136 || (DECL_DECLARED_INLINE_P (decl)
2137 && ! flag_implement_inlines
2138 && !DECL_VINDEX (decl)));
2140 if (!DECL_NOT_REALLY_EXTERN (decl))
2141 DECL_EXTERNAL (decl) = 1;
2143 /* Always make artificials weak. */
2144 if (DECL_ARTIFICIAL (decl) && flag_weak)
2147 maybe_make_one_only (decl);
2158 /* If we are importing DECL into this translation unit, mark is
2159 an undefined here. */
2160 DECL_EXTERNAL (decl) = 1;
2161 DECL_NOT_REALLY_EXTERN (decl) = 0;
2165 /* If we decided to put DECL in COMDAT, mark it accordingly at
2167 comdat_linkage (decl);
2170 DECL_INTERFACE_KNOWN (decl) = 1;
2173 /* Return an expression that performs the destruction of DECL, which
2174 must be a VAR_DECL whose type has a non-trivial destructor, or is
2175 an array whose (innermost) elements have a non-trivial destructor. */
2178 build_cleanup (tree decl)
2181 tree type = TREE_TYPE (decl);
2183 /* This function should only be called for declarations that really
2184 require cleanups. */
2185 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2187 /* Treat all objects with destructors as used; the destructor may do
2188 something substantive. */
2191 if (TREE_CODE (type) == ARRAY_TYPE)
2194 temp = build_address (decl);
2195 temp = build_delete (TREE_TYPE (temp), temp,
2196 sfk_complete_destructor,
2197 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2201 /* Returns the initialization guard variable for the variable DECL,
2202 which has static storage duration. */
2205 get_guard (tree decl)
2210 sname = mangle_guard_variable (decl);
2211 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2216 /* We use a type that is big enough to contain a mutex as well
2217 as an integer counter. */
2218 guard_type = targetm.cxx.guard_type ();
2219 guard = build_decl (VAR_DECL, sname, guard_type);
2221 /* The guard should have the same linkage as what it guards. */
2222 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2223 TREE_STATIC (guard) = TREE_STATIC (decl);
2224 DECL_COMMON (guard) = DECL_COMMON (decl);
2225 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2226 if (TREE_PUBLIC (decl))
2227 DECL_WEAK (guard) = DECL_WEAK (decl);
2229 DECL_ARTIFICIAL (guard) = 1;
2230 DECL_IGNORED_P (guard) = 1;
2231 TREE_USED (guard) = 1;
2232 pushdecl_top_level_and_finish (guard, NULL_TREE);
2237 /* Return those bits of the GUARD variable that should be set when the
2238 guarded entity is actually initialized. */
2241 get_guard_bits (tree guard)
2243 if (!targetm.cxx.guard_mask_bit ())
2245 /* We only set the first byte of the guard, in order to leave room
2246 for a mutex in the high-order bits. */
2247 guard = build1 (ADDR_EXPR,
2248 build_pointer_type (TREE_TYPE (guard)),
2250 guard = build1 (NOP_EXPR,
2251 build_pointer_type (char_type_node),
2253 guard = build1 (INDIRECT_REF, char_type_node, guard);
2259 /* Return an expression which determines whether or not the GUARD
2260 variable has already been initialized. */
2263 get_guard_cond (tree guard)
2267 /* Check to see if the GUARD is zero. */
2268 guard = get_guard_bits (guard);
2270 /* Mask off all but the low bit. */
2271 if (targetm.cxx.guard_mask_bit ())
2273 guard_value = integer_one_node;
2274 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2275 guard_value = convert (TREE_TYPE (guard), guard_value);
2276 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2279 guard_value = integer_zero_node;
2280 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2281 guard_value = convert (TREE_TYPE (guard), guard_value);
2282 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2285 /* Return an expression which sets the GUARD variable, indicating that
2286 the variable being guarded has been initialized. */
2289 set_guard (tree guard)
2293 /* Set the GUARD to one. */
2294 guard = get_guard_bits (guard);
2295 guard_init = integer_one_node;
2296 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2297 guard_init = convert (TREE_TYPE (guard), guard_init);
2298 return build_modify_expr (guard, NOP_EXPR, guard_init);
2301 /* Start the process of running a particular set of global constructors
2302 or destructors. Subroutine of do_[cd]tors. */
2305 start_objects (int method_type, int initp)
2311 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2313 if (initp != DEFAULT_INIT_PRIORITY)
2323 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2326 sprintf (type, "%c", method_type);
2328 fndecl = build_lang_decl (FUNCTION_DECL,
2329 get_file_function_name (type),
2330 build_function_type (void_type_node,
2332 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2334 TREE_PUBLIC (current_function_decl) = 0;
2336 /* Mark as artificial because it's not explicitly in the user's
2338 DECL_ARTIFICIAL (current_function_decl) = 1;
2340 /* Mark this declaration as used to avoid spurious warnings. */
2341 TREE_USED (current_function_decl) = 1;
2343 /* Mark this function as a global constructor or destructor. */
2344 if (method_type == 'I')
2345 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2347 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2348 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2350 body = begin_compound_stmt (BCS_FN_BODY);
2355 /* Finish the process of running a particular set of global constructors
2356 or destructors. Subroutine of do_[cd]tors. */
2359 finish_objects (int method_type, int initp, tree body)
2364 finish_compound_stmt (body);
2365 fn = finish_function (0);
2367 if (method_type == 'I')
2369 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2370 decl_init_priority_insert (fn, initp);
2374 DECL_STATIC_DESTRUCTOR (fn) = 1;
2375 decl_fini_priority_insert (fn, initp);
2378 expand_or_defer_fn (fn);
2381 /* The names of the parameters to the function created to handle
2382 initializations and destructions for objects with static storage
2384 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2385 #define PRIORITY_IDENTIFIER "__priority"
2387 /* The name of the function we create to handle initializations and
2388 destructions for objects with static storage duration. */
2389 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2391 /* The declaration for the __INITIALIZE_P argument. */
2392 static GTY(()) tree initialize_p_decl;
2394 /* The declaration for the __PRIORITY argument. */
2395 static GTY(()) tree priority_decl;
2397 /* The declaration for the static storage duration function. */
2398 static GTY(()) tree ssdf_decl;
2400 /* All the static storage duration functions created in this
2401 translation unit. */
2402 static GTY(()) VEC(tree,gc) *ssdf_decls;
2404 /* A map from priority levels to information about that priority
2405 level. There may be many such levels, so efficient lookup is
2407 static splay_tree priority_info_map;
2409 /* Begins the generation of the function that will handle all
2410 initialization and destruction of objects with static storage
2411 duration. The function generated takes two parameters of type
2412 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2413 nonzero, it performs initializations. Otherwise, it performs
2414 destructions. It only performs those initializations or
2415 destructions with the indicated __PRIORITY. The generated function
2418 It is assumed that this function will only be called once per
2419 translation unit. */
2422 start_static_storage_duration_function (unsigned count)
2427 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2429 /* Create the identifier for this function. It will be of the form
2430 SSDF_IDENTIFIER_<number>. */
2431 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2433 /* Create the parameters. */
2434 parm_types = void_list_node;
2435 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2436 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2437 type = build_function_type (void_type_node, parm_types);
2439 /* Create the FUNCTION_DECL itself. */
2440 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2441 get_identifier (id),
2443 TREE_PUBLIC (ssdf_decl) = 0;
2444 DECL_ARTIFICIAL (ssdf_decl) = 1;
2445 DECL_INLINE (ssdf_decl) = 1;
2447 /* Put this function in the list of functions to be called from the
2448 static constructors and destructors. */
2451 ssdf_decls = VEC_alloc (tree, gc, 32);
2453 /* Take this opportunity to initialize the map from priority
2454 numbers to information about that priority level. */
2455 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2456 /*delete_key_fn=*/0,
2457 /*delete_value_fn=*/
2458 (splay_tree_delete_value_fn) &free);
2460 /* We always need to generate functions for the
2461 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2462 priorities later, we'll be sure to find the
2463 DEFAULT_INIT_PRIORITY. */
2464 get_priority_info (DEFAULT_INIT_PRIORITY);
2467 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2469 /* Create the argument list. */
2470 initialize_p_decl = cp_build_parm_decl
2471 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2472 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2473 TREE_USED (initialize_p_decl) = 1;
2474 priority_decl = cp_build_parm_decl
2475 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2476 DECL_CONTEXT (priority_decl) = ssdf_decl;
2477 TREE_USED (priority_decl) = 1;
2479 TREE_CHAIN (initialize_p_decl) = priority_decl;
2480 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2482 /* Put the function in the global scope. */
2483 pushdecl (ssdf_decl);
2485 /* Start the function itself. This is equivalent to declaring the
2488 static void __ssdf (int __initialize_p, init __priority_p);
2490 It is static because we only need to call this function from the
2491 various constructor and destructor functions for this module. */
2492 start_preparsed_function (ssdf_decl,
2493 /*attrs=*/NULL_TREE,
2496 /* Set up the scope of the outermost block in the function. */
2497 body = begin_compound_stmt (BCS_FN_BODY);
2502 /* Finish the generation of the function which performs initialization
2503 and destruction of objects with static storage duration. After
2504 this point, no more such objects can be created. */
2507 finish_static_storage_duration_function (tree body)
2509 /* Close out the function. */
2510 finish_compound_stmt (body);
2511 expand_or_defer_fn (finish_function (0));
2514 /* Return the information about the indicated PRIORITY level. If no
2515 code to handle this level has yet been generated, generate the
2516 appropriate prologue. */
2518 static priority_info
2519 get_priority_info (int priority)
2524 n = splay_tree_lookup (priority_info_map,
2525 (splay_tree_key) priority);
2528 /* Create a new priority information structure, and insert it
2530 pi = XNEW (struct priority_info_s);
2531 pi->initializations_p = 0;
2532 pi->destructions_p = 0;
2533 splay_tree_insert (priority_info_map,
2534 (splay_tree_key) priority,
2535 (splay_tree_value) pi);
2538 pi = (priority_info) n->value;
2543 /* The effective initialization priority of a DECL. */
2545 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2546 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2547 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2549 /* Whether a DECL needs a guard to protect it against multiple
2552 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2553 || DECL_ONE_ONLY (decl) \
2554 || DECL_WEAK (decl)))
2556 /* Set up to handle the initialization or destruction of DECL. If
2557 INITP is nonzero, we are initializing the variable. Otherwise, we
2558 are destroying it. */
2561 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2563 tree guard_if_stmt = NULL_TREE;
2566 /* If we are supposed to destruct and there's a trivial destructor,
2567 nothing has to be done. */
2569 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2572 /* Trick the compiler into thinking we are at the file and line
2573 where DECL was declared so that error-messages make sense, and so
2574 that the debugger will show somewhat sensible file and line
2576 input_location = DECL_SOURCE_LOCATION (decl);
2582 Access control for implicit calls to the constructors,
2583 the conversion functions, or the destructor called to
2584 create and destroy a static data member is performed as
2585 if these calls appeared in the scope of the member's
2588 we pretend we are in a static member function of the class of
2589 which the DECL is a member. */
2590 if (member_p (decl))
2592 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2593 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2596 /* Assume we don't need a guard. */
2598 /* We need a guard if this is an object with external linkage that
2599 might be initialized in more than one place. (For example, a
2600 static data member of a template, when the data member requires
2602 if (NEEDS_GUARD_P (decl))
2606 guard = get_guard (decl);
2608 /* When using __cxa_atexit, we just check the GUARD as we would
2609 for a local static. */
2610 if (flag_use_cxa_atexit)
2612 /* When using __cxa_atexit, we never try to destroy
2613 anything from a static destructor. */
2615 guard_cond = get_guard_cond (guard);
2617 /* If we don't have __cxa_atexit, then we will be running
2618 destructors from .fini sections, or their equivalents. So,
2619 we need to know how many times we've tried to initialize this
2620 object. We do initializations only if the GUARD is zero,
2621 i.e., if we are the first to initialize the variable. We do
2622 destructions only if the GUARD is one, i.e., if we are the
2623 last to destroy the variable. */
2626 = cp_build_binary_op (EQ_EXPR,
2627 build_unary_op (PREINCREMENT_EXPR,
2633 = cp_build_binary_op (EQ_EXPR,
2634 build_unary_op (PREDECREMENT_EXPR,
2639 guard_if_stmt = begin_if_stmt ();
2640 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2644 /* If we're using __cxa_atexit, we have not already set the GUARD,
2645 so we must do so now. */
2646 if (guard && initp && flag_use_cxa_atexit)
2647 finish_expr_stmt (set_guard (guard));
2649 /* Perform the initialization or destruction. */
2653 finish_expr_stmt (init);
2655 /* If we're using __cxa_atexit, register a function that calls the
2656 destructor for the object. */
2657 if (flag_use_cxa_atexit)
2658 finish_expr_stmt (register_dtor_fn (decl));
2661 finish_expr_stmt (build_cleanup (decl));
2663 /* Finish the guard if-stmt, if necessary. */
2666 finish_then_clause (guard_if_stmt);
2667 finish_if_stmt (guard_if_stmt);
2670 /* Now that we're done with DECL we don't need to pretend to be a
2671 member of its class any longer. */
2672 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2673 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2676 /* Generate code to do the initialization or destruction of the decls in VARS,
2677 a TREE_LIST of VAR_DECL with static storage duration.
2678 Whether initialization or destruction is performed is specified by INITP. */
2681 do_static_initialization_or_destruction (tree vars, bool initp)
2683 tree node, init_if_stmt, cond;
2685 /* Build the outer if-stmt to check for initialization or destruction. */
2686 init_if_stmt = begin_if_stmt ();
2687 cond = initp ? integer_one_node : integer_zero_node;
2688 cond = cp_build_binary_op (EQ_EXPR,
2691 finish_if_stmt_cond (cond, init_if_stmt);
2695 tree decl = TREE_VALUE (node);
2696 tree priority_if_stmt;
2700 /* If we don't need a destructor, there's nothing to do. Avoid
2701 creating a possibly empty if-stmt. */
2702 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2704 node = TREE_CHAIN (node);
2708 /* Remember that we had an initialization or finalization at this
2710 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2711 pi = get_priority_info (priority);
2713 pi->initializations_p = 1;
2715 pi->destructions_p = 1;
2717 /* Conditionalize this initialization on being in the right priority
2718 and being initializing/finalizing appropriately. */
2719 priority_if_stmt = begin_if_stmt ();
2720 cond = cp_build_binary_op (EQ_EXPR,
2722 build_int_cst (NULL_TREE, priority));
2723 finish_if_stmt_cond (cond, priority_if_stmt);
2725 /* Process initializers with same priority. */
2727 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2728 node = TREE_CHAIN (node))
2729 /* Do one initialization or destruction. */
2730 one_static_initialization_or_destruction (TREE_VALUE (node),
2731 TREE_PURPOSE (node), initp);
2733 /* Finish up the priority if-stmt body. */
2734 finish_then_clause (priority_if_stmt);
2735 finish_if_stmt (priority_if_stmt);
2739 /* Finish up the init/destruct if-stmt body. */
2740 finish_then_clause (init_if_stmt);
2741 finish_if_stmt (init_if_stmt);
2744 /* VARS is a list of variables with static storage duration which may
2745 need initialization and/or finalization. Remove those variables
2746 that don't really need to be initialized or finalized, and return
2747 the resulting list. The order in which the variables appear in
2748 VARS is in reverse order of the order in which they should actually
2749 be initialized. The list we return is in the unreversed order;
2750 i.e., the first variable should be initialized first. */
2753 prune_vars_needing_no_initialization (tree *vars)
2756 tree result = NULL_TREE;
2761 tree decl = TREE_VALUE (t);
2762 tree init = TREE_PURPOSE (t);
2764 /* Deal gracefully with error. */
2765 if (decl == error_mark_node)
2767 var = &TREE_CHAIN (t);
2771 /* The only things that can be initialized are variables. */
2772 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2774 /* If this object is not defined, we don't need to do anything
2776 if (DECL_EXTERNAL (decl))
2778 var = &TREE_CHAIN (t);
2782 /* Also, if the initializer already contains errors, we can bail
2784 if (init && TREE_CODE (init) == TREE_LIST
2785 && value_member (error_mark_node, init))
2787 var = &TREE_CHAIN (t);
2791 /* This variable is going to need initialization and/or
2792 finalization, so we add it to the list. */
2793 *var = TREE_CHAIN (t);
2794 TREE_CHAIN (t) = result;
2801 /* Make sure we have told the back end about all the variables in
2805 write_out_vars (tree vars)
2809 for (v = vars; v; v = TREE_CHAIN (v))
2811 tree var = TREE_VALUE (v);
2812 if (!var_finalized_p (var))
2814 import_export_decl (var);
2815 rest_of_decl_compilation (var, 1, 1);
2820 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2821 (otherwise) that will initialize all global objects with static
2822 storage duration having the indicated PRIORITY. */
2825 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2834 input_location = *locus;
2835 #ifdef USE_MAPPED_LOCATION
2841 /* We use `I' to indicate initialization and `D' to indicate
2843 function_key = constructor_p ? 'I' : 'D';
2845 /* We emit the function lazily, to avoid generating empty
2846 global constructors and destructors. */
2849 /* For Objective-C++, we may need to initialize metadata found in this module.
2850 This must be done _before_ any other static initializations. */
2851 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2852 && constructor_p && objc_static_init_needed_p ())
2854 body = start_objects (function_key, priority);
2855 objc_generate_static_init_call (NULL_TREE);
2858 /* Call the static storage duration function with appropriate
2860 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2862 /* Calls to pure or const functions will expand to nothing. */
2863 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2866 body = start_objects (function_key, priority);
2868 arguments = tree_cons (NULL_TREE,
2869 build_int_cst (NULL_TREE, priority),
2871 arguments = tree_cons (NULL_TREE,
2872 build_int_cst (NULL_TREE, constructor_p),
2874 finish_expr_stmt (build_function_call (fndecl, arguments));
2878 /* Close out the function. */
2880 finish_objects (function_key, priority, body);
2883 /* Generate constructor and destructor functions for the priority
2887 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2889 location_t *locus = (location_t *) data;
2890 int priority = (int) n->key;
2891 priority_info pi = (priority_info) n->value;
2893 /* Generate the functions themselves, but only if they are really
2895 if (pi->initializations_p)
2896 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2897 if (pi->destructions_p)
2898 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2900 /* Keep iterating. */
2904 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2905 decls referenced from front-end specific constructs; it will be called
2906 only for language-specific tree nodes.
2908 Here we must deal with member pointers. */
2911 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2912 tree from ATTRIBUTE_UNUSED)
2916 switch (TREE_CODE (t))
2919 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2920 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2923 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2924 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2927 if (DECL_VTABLE_OR_VTT_P (t))
2929 /* The ABI requires that all virtual tables be emitted
2930 whenever one of them is. */
2932 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2934 vtbl = TREE_CHAIN (vtbl))
2935 mark_decl_referenced (vtbl);
2937 else if (DECL_CONTEXT (t)
2938 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2939 /* If we need a static variable in a function, then we
2940 need the containing function. */
2941 mark_decl_referenced (DECL_CONTEXT (t));
2950 /* Java requires that we be able to reference a local address for a
2951 method, and not be confused by PLT entries. If hidden aliases are
2952 supported, emit one for each java function that we've emitted. */
2955 build_java_method_aliases (void)
2957 struct cgraph_node *node;
2959 #ifndef HAVE_GAS_HIDDEN
2963 for (node = cgraph_nodes; node ; node = node->next)
2965 tree fndecl = node->decl;
2967 if (TREE_ASM_WRITTEN (fndecl)
2968 && DECL_CONTEXT (fndecl)
2969 && TYPE_P (DECL_CONTEXT (fndecl))
2970 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
2971 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
2973 /* Mangle the name in a predictable way; we need to reference
2974 this from a java compiled object file. */
2975 tree oid, nid, alias;
2979 oid = DECL_ASSEMBLER_NAME (fndecl);
2980 oname = IDENTIFIER_POINTER (oid);
2981 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
2982 nname = ACONCAT (("_ZGA", oname+2, NULL));
2983 nid = get_identifier (nname);
2985 alias = make_alias_for (fndecl, nid);
2986 TREE_PUBLIC (alias) = 1;
2987 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
2989 assemble_alias (alias, oid);
2994 /* This routine is called at the end of compilation.
2995 Its job is to create all the code needed to initialize and
2996 destroy the global aggregates. We do the destruction
2997 first, since that way we only need to reverse the decls once. */
3000 cp_write_global_declarations (void)
3006 unsigned ssdf_count = 0;
3010 locus = input_location;
3013 /* Bad parse errors. Just forget about it. */
3014 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3018 c_common_write_pch ();
3020 #ifdef USE_MAPPED_LOCATION
3023 /* Otherwise, GDB can get confused, because in only knows
3024 about source for LINENO-1 lines. */
3028 /* We now have to write out all the stuff we put off writing out.
3031 o Template specializations that we have not yet instantiated,
3032 but which are needed.
3033 o Initialization and destruction for non-local objects with
3034 static storage duration. (Local objects with static storage
3035 duration are initialized when their scope is first entered,
3036 and are cleaned up via atexit.)
3037 o Virtual function tables.
3039 All of these may cause others to be needed. For example,
3040 instantiating one function may cause another to be needed, and
3041 generating the initializer for an object may cause templates to be
3042 instantiated, etc., etc. */
3044 timevar_push (TV_VARCONST);
3046 emit_support_tinfos ();
3055 /* If there are templates that we've put off instantiating, do
3057 instantiate_pending_templates (retries);
3060 /* Write out virtual tables as required. Note that writing out
3061 the virtual table for a template class may cause the
3062 instantiation of members of that class. If we write out
3063 vtables then we remove the class from our list so we don't
3064 have to look at it again. */
3066 while (keyed_classes != NULL_TREE
3067 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3070 keyed_classes = TREE_CHAIN (keyed_classes);
3076 tree next = TREE_CHAIN (t);
3080 if (maybe_emit_vtables (TREE_VALUE (next)))
3083 TREE_CHAIN (t) = TREE_CHAIN (next);
3088 next = TREE_CHAIN (t);
3092 /* Write out needed type info variables. We have to be careful
3093 looping through unemitted decls, because emit_tinfo_decl may
3094 cause other variables to be needed. New elements will be
3095 appended, and we remove from the vector those that actually
3097 for (i = VEC_length (tree, unemitted_tinfo_decls);
3098 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3099 if (emit_tinfo_decl (t))
3102 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3105 /* The list of objects with static storage duration is built up
3106 in reverse order. We clear STATIC_AGGREGATES so that any new
3107 aggregates added during the initialization of these will be
3108 initialized in the correct order when we next come around the
3110 vars = prune_vars_needing_no_initialization (&static_aggregates);
3114 /* We need to start a new initialization function each time
3115 through the loop. That's because we need to know which
3116 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3117 isn't computed until a function is finished, and written
3118 out. That's a deficiency in the back end. When this is
3119 fixed, these initialization functions could all become
3120 inline, with resulting performance improvements. */
3123 /* Set the line and file, so that it is obviously not from
3125 input_location = locus;
3126 ssdf_body = start_static_storage_duration_function (ssdf_count);
3128 /* Make sure the back end knows about all the variables. */
3129 write_out_vars (vars);
3131 /* First generate code to do all the initializations. */
3133 do_static_initialization_or_destruction (vars, /*initp=*/true);
3135 /* Then, generate code to do all the destructions. Do these
3136 in reverse order so that the most recently constructed
3137 variable is the first destroyed. If we're using
3138 __cxa_atexit, then we don't need to do this; functions
3139 were registered at initialization time to destroy the
3141 if (!flag_use_cxa_atexit && vars)
3143 vars = nreverse (vars);
3144 do_static_initialization_or_destruction (vars, /*initp=*/false);
3149 /* Finish up the static storage duration function for this
3151 input_location = locus;
3152 finish_static_storage_duration_function (ssdf_body);
3154 /* All those initializations and finalizations might cause
3155 us to need more inline functions, more template
3156 instantiations, etc. */
3159 #ifdef USE_MAPPED_LOCATION
3166 /* Go through the set of inline functions whose bodies have not
3167 been emitted yet. If out-of-line copies of these functions
3168 are required, emit them. */
3169 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3171 /* Does it need synthesizing? */
3172 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3173 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3175 /* Even though we're already at the top-level, we push
3176 there again. That way, when we pop back a few lines
3177 hence, all of our state is restored. Otherwise,
3178 finish_function doesn't clean things up, and we end
3179 up with CURRENT_FUNCTION_DECL set. */
3180 push_to_top_level ();
3181 /* The decl's location will mark where it was first
3182 needed. Save that so synthesize method can indicate
3183 where it was needed from, in case of error */
3184 input_location = DECL_SOURCE_LOCATION (decl);
3185 synthesize_method (decl);
3186 pop_from_top_level ();
3190 if (!DECL_SAVED_TREE (decl))
3193 /* We lie to the back end, pretending that some functions
3194 are not defined when they really are. This keeps these
3195 functions from being put out unnecessarily. But, we must
3196 stop lying when the functions are referenced, or if they
3197 are not comdat since they need to be put out now. If
3198 DECL_INTERFACE_KNOWN, then we have already set
3199 DECL_EXTERNAL appropriately, so there's no need to check
3200 again, and we do not want to clear DECL_EXTERNAL if a
3201 previous call to import_export_decl set it.
3203 This is done in a separate for cycle, because if some
3204 deferred function is contained in another deferred
3205 function later in deferred_fns varray,
3206 rest_of_compilation would skip this function and we
3207 really cannot expand the same function twice. */
3208 import_export_decl (decl);
3209 if (DECL_NOT_REALLY_EXTERN (decl)
3210 && DECL_INITIAL (decl)
3211 && decl_needed_p (decl))
3212 DECL_EXTERNAL (decl) = 0;
3214 /* If we're going to need to write this function out, and
3215 there's already a body for it, create RTL for it now.
3216 (There might be no body if this is a method we haven't
3217 gotten around to synthesizing yet.) */
3218 if (!DECL_EXTERNAL (decl)
3219 && decl_needed_p (decl)
3220 && !TREE_ASM_WRITTEN (decl)
3221 && !cgraph_node (decl)->local.finalized)
3223 /* We will output the function; no longer consider it in this
3225 DECL_DEFER_OUTPUT (decl) = 0;
3226 /* Generate RTL for this function now that we know we
3228 expand_or_defer_fn (decl);
3229 /* If we're compiling -fsyntax-only pretend that this
3230 function has been written out so that we don't try to
3232 if (flag_syntax_only)
3233 TREE_ASM_WRITTEN (decl) = 1;
3238 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3241 /* Static data members are just like namespace-scope globals. */
3242 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3244 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3246 import_export_decl (decl);
3247 /* If this static data member is needed, provide it to the
3249 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3250 DECL_EXTERNAL (decl) = 0;
3252 if (VEC_length (tree, pending_statics) != 0
3253 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3254 VEC_length (tree, pending_statics)))
3261 /* All used inline functions must have a definition at this point. */
3262 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3264 if (/* Check online inline functions that were actually used. */
3265 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3266 /* If the definition actually was available here, then the
3267 fact that the function was not defined merely represents
3268 that for some reason (use of a template repository,
3269 #pragma interface, etc.) we decided not to emit the
3271 && !DECL_INITIAL (decl)
3272 /* An explicit instantiation can be used to specify
3273 that the body is in another unit. It will have
3274 already verified there was a definition. */
3275 && !DECL_EXPLICIT_INSTANTIATION (decl))
3277 warning (0, "inline function %q+D used but never defined", decl);
3278 /* Avoid a duplicate warning from check_global_declaration_1. */
3279 TREE_NO_WARNING (decl) = 1;
3283 /* We give C linkage to static constructors and destructors. */
3284 push_lang_context (lang_name_c);
3286 /* Generate initialization and destruction functions for all
3287 priorities for which they are required. */
3288 if (priority_info_map)
3289 splay_tree_foreach (priority_info_map,
3290 generate_ctor_and_dtor_functions_for_priority,
3292 else if (c_dialect_objc () && objc_static_init_needed_p ())
3293 /* If this is obj-c++ and we need a static init, call
3294 generate_ctor_or_dtor_function. */
3295 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3296 DEFAULT_INIT_PRIORITY, &locus);
3298 /* We're done with the splay-tree now. */
3299 if (priority_info_map)
3300 splay_tree_delete (priority_info_map);
3302 /* Generate any missing aliases. */
3303 maybe_apply_pending_pragma_weaks ();
3305 /* We're done with static constructors, so we can go back to "C++"
3307 pop_lang_context ();
3309 cgraph_finalize_compilation_unit ();
3312 /* Now, issue warnings about static, but not defined, functions,
3313 etc., and emit debugging information. */
3314 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3315 if (VEC_length (tree, pending_statics) != 0)
3317 check_global_declarations (VEC_address (tree, pending_statics),
3318 VEC_length (tree, pending_statics));
3319 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3320 VEC_length (tree, pending_statics));
3323 /* Generate hidden aliases for Java. */
3324 build_java_method_aliases ();
3328 /* The entire file is now complete. If requested, dump everything
3332 FILE *stream = dump_begin (TDI_tu, &flags);
3336 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3337 dump_end (TDI_tu, stream);
3341 timevar_pop (TV_VARCONST);
3343 if (flag_detailed_statistics)
3345 dump_tree_statistics ();
3346 dump_time_statistics ();
3348 input_location = locus;
3350 #ifdef ENABLE_CHECKING
3351 validate_conversion_obstack ();
3352 #endif /* ENABLE_CHECKING */
3355 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3356 function to call in parse-tree form; it has not yet been
3357 semantically analyzed. ARGS are the arguments to the function.
3358 They have already been semantically analyzed. */
3361 build_offset_ref_call_from_tree (tree fn, tree args)
3370 object = TREE_OPERAND (fn, 0);
3372 if (processing_template_decl)
3374 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3375 || TREE_CODE (fn) == MEMBER_REF);
3376 if (type_dependent_expression_p (fn)
3377 || any_type_dependent_arguments_p (args))
3378 return build_nt_call_list (fn, args);
3380 /* Transform the arguments and add the implicit "this"
3381 parameter. That must be done before the FN is transformed
3382 because we depend on the form of FN. */
3383 args = build_non_dependent_args (args);
3384 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3385 object = build_unary_op (ADDR_EXPR, object, 0);
3386 object = build_non_dependent_expr (object);
3387 args = tree_cons (NULL_TREE, object, args);
3388 /* Now that the arguments are done, transform FN. */
3389 fn = build_non_dependent_expr (fn);
3392 /* A qualified name corresponding to a bound pointer-to-member is
3393 represented as an OFFSET_REF:
3395 struct B { void g(); };
3397 void B::g() { (this->*p)(); } */
3398 if (TREE_CODE (fn) == OFFSET_REF)
3400 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3401 fn = TREE_OPERAND (fn, 1);
3402 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3403 args = tree_cons (NULL_TREE, object_addr, args);
3406 expr = build_function_call (fn, args);
3407 if (processing_template_decl && expr != error_mark_node)
3408 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3414 check_default_args (tree x)
3416 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3417 bool saw_def = false;
3418 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3419 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3421 if (TREE_PURPOSE (arg))
3425 error ("default argument missing for parameter %P of %q+#D", i, x);
3426 TREE_PURPOSE (arg) = error_mark_node;
3431 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3432 If DECL is a specialization or implicitly declared class member,
3433 generate the actual definition. */
3436 mark_used (tree decl)
3438 HOST_WIDE_INT saved_processing_template_decl = 0;
3440 /* If DECL is a BASELINK for a single function, then treat it just
3441 like the DECL for the function. Otherwise, if the BASELINK is
3442 for an overloaded function, we don't know which function was
3443 actually used until after overload resolution. */
3444 if (TREE_CODE (decl) == BASELINK)
3446 decl = BASELINK_FUNCTIONS (decl);
3447 if (really_overloaded_fn (decl))
3449 decl = OVL_CURRENT (decl);
3452 TREE_USED (decl) = 1;
3453 if (DECL_CLONED_FUNCTION_P (decl))
3454 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3455 /* If we don't need a value, then we don't need to synthesize DECL. */
3456 if (skip_evaluation)
3458 /* Normally, we can wait until instantiation-time to synthesize
3459 DECL. However, if DECL is a static data member initialized with
3460 a constant, we need the value right now because a reference to
3461 such a data member is not value-dependent. */
3462 if (TREE_CODE (decl) == VAR_DECL
3463 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3464 && DECL_CLASS_SCOPE_P (decl))
3466 /* Don't try to instantiate members of dependent types. We
3467 cannot just use dependent_type_p here because this function
3468 may be called from fold_non_dependent_expr, and then we may
3469 see dependent types, even though processing_template_decl
3471 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3472 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3474 /* Pretend that we are not in a template, even if we are, so
3475 that the static data member initializer will be processed. */
3476 saved_processing_template_decl = processing_template_decl;
3477 processing_template_decl = 0;
3480 if (processing_template_decl)
3483 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3484 && !TREE_ASM_WRITTEN (decl))
3485 /* Remember it, so we can check it was defined. */
3487 if (DECL_DEFERRED_FN (decl))
3490 /* Remember the current location for a function we will end up
3491 synthesizing. Then we can inform the user where it was
3492 required in the case of error. */
3493 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3494 && !DECL_THUNK_P (decl))
3495 DECL_SOURCE_LOCATION (decl) = input_location;
3497 note_vague_linkage_fn (decl);
3500 assemble_external (decl);
3502 /* Is it a synthesized method that needs to be synthesized? */
3503 if (TREE_CODE (decl) == FUNCTION_DECL
3504 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3505 && DECL_ARTIFICIAL (decl)
3506 && !DECL_THUNK_P (decl)
3507 && ! DECL_INITIAL (decl)
3508 /* Kludge: don't synthesize for default args. Unfortunately this
3509 rules out initializers of namespace-scoped objects too, but
3510 it's sort-of ok if the implicit ctor or dtor decl keeps
3511 pointing to the class location. */
3512 && current_function_decl)
3514 synthesize_method (decl);
3515 /* If we've already synthesized the method we don't need to
3516 do the instantiation test below. */
3518 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3519 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3520 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3521 || (TREE_CODE (decl) == FUNCTION_DECL
3522 && DECL_INLINE (DECL_TEMPLATE_RESULT
3523 (template_for_substitution (decl))))
3524 /* We need to instantiate static data members so that there
3525 initializers are available in integral constant
3527 || (TREE_CODE (decl) == VAR_DECL
3528 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3529 /* If this is a function or variable that is an instance of some
3530 template, we now know that we will need to actually do the
3531 instantiation. We check that DECL is not an explicit
3532 instantiation because that is not checked in instantiate_decl.
3534 We put off instantiating functions in order to improve compile
3535 times. Maintaining a stack of active functions is expensive,
3536 and the inliner knows to instantiate any functions it might
3537 need. Therefore, we always try to defer instantiation. */
3538 instantiate_decl (decl, /*defer_ok=*/true,
3539 /*expl_inst_class_mem_p=*/false);
3541 processing_template_decl = saved_processing_template_decl;
3544 #include "gt-cp-decl2.h"