Mercurial > hg > graal-jvmci-8
diff src/share/vm/oops/instanceRefKlass.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 37f87013dfd8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/oops/instanceRefKlass.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,87 @@ +/* + * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +// An instanceRefKlass is a specialized instanceKlass for Java +// classes that are subclasses of java/lang/ref/Reference. +// +// These classes are used to implement soft/weak/final/phantom +// references and finalization, and need special treatment by the +// garbage collector. +// +// During GC discovered reference objects are added (chained) to one +// of the four lists below, depending on the type of reference. +// The linked occurs through the next field in class java/lang/ref/Reference. +// +// Afterwards, the discovered references are processed in decreasing +// order of reachability. Reference objects eligible for notification +// are linked to the static pending_list in class java/lang/ref/Reference, +// and the pending list lock object in the same class is notified. + + +class instanceRefKlass: public instanceKlass { + public: + // Type testing + bool oop_is_instanceRef() const { return true; } + + // Casting from klassOop + static instanceRefKlass* cast(klassOop k) { + assert(k->klass_part()->oop_is_instanceRef(), "cast to instanceRefKlass"); + return (instanceRefKlass*) k->klass_part(); + } + + // allocation + DEFINE_ALLOCATE_PERMANENT(instanceRefKlass); + + // Garbage collection + int oop_adjust_pointers(oop obj); + void oop_follow_contents(oop obj); + + // Parallel Scavenge and Parallel Old + PARALLEL_GC_DECLS + + int oop_oop_iterate(oop obj, OopClosure* blk) { + return oop_oop_iterate_v(obj, blk); + } + int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { + return oop_oop_iterate_v_m(obj, blk, mr); + } + +#define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ + int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ + int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr); + + ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL) + ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DECL) + + static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock); + static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock); + + // Update non-static oop maps so 'referent', 'nextPending' and + // 'discovered' will look like non-oops + static void update_nonstatic_oop_maps(klassOop k); + + public: + // Verification + void oop_verify_on(oop obj, outputStream* st); +};