duke@435: /*
stefank@2314:  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP
stefank@2314: #define SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP
stefank@2314: 
stefank@2314: #include "memory/cardTableRS.hpp"
stefank@2314: #include "memory/defNewGeneration.hpp"
stefank@2314: #include "memory/space.hpp"
stefank@2314: 
coleenp@548: // Methods of protected closure types
coleenp@548: 
coleenp@548: template <class T>
coleenp@548: inline void DefNewGeneration::KeepAliveClosure::do_oop_work(T* p) {
coleenp@548: #ifdef ASSERT
coleenp@548:   {
coleenp@548:     // We never expect to see a null reference being processed
coleenp@548:     // as a weak reference.
coleenp@548:     assert (!oopDesc::is_null(*p), "expected non-null ref");
coleenp@548:     oop obj = oopDesc::load_decode_heap_oop_not_null(p);
coleenp@548:     assert (obj->is_oop(), "expected an oop while scanning weak refs");
coleenp@548:   }
coleenp@548: #endif // ASSERT
coleenp@548: 
coleenp@548:   _cl->do_oop_nv(p);
coleenp@548: 
coleenp@548:   // Card marking is trickier for weak refs.
coleenp@548:   // This oop is a 'next' field which was filled in while we
coleenp@548:   // were discovering weak references. While we might not need
coleenp@548:   // to take a special action to keep this reference alive, we
coleenp@548:   // will need to dirty a card as the field was modified.
coleenp@548:   //
coleenp@548:   // Alternatively, we could create a method which iterates through
coleenp@548:   // each generation, allowing them in turn to examine the modified
coleenp@548:   // field.
coleenp@548:   //
coleenp@548:   // We could check that p is also in an older generation, but
coleenp@548:   // dirty cards in the youngest gen are never scanned, so the
coleenp@548:   // extra check probably isn't worthwhile.
coleenp@548:   if (Universe::heap()->is_in_reserved(p)) {
coleenp@548:     oop obj = oopDesc::load_decode_heap_oop_not_null(p);
coleenp@548:     _rs->inline_write_ref_field_gc(p, obj);
coleenp@548:   }
duke@435: }
duke@435: 
coleenp@548: template <class T>
coleenp@548: inline void DefNewGeneration::FastKeepAliveClosure::do_oop_work(T* p) {
coleenp@548: #ifdef ASSERT
coleenp@548:   {
coleenp@548:     // We never expect to see a null reference being processed
coleenp@548:     // as a weak reference.
coleenp@548:     assert (!oopDesc::is_null(*p), "expected non-null ref");
coleenp@548:     oop obj = oopDesc::load_decode_heap_oop_not_null(p);
coleenp@548:     assert (obj->is_oop(), "expected an oop while scanning weak refs");
duke@435:   }
coleenp@548: #endif // ASSERT
duke@435: 
coleenp@548:   _cl->do_oop_nv(p);
coleenp@548: 
coleenp@548:   // Optimized for Defnew generation if it's the youngest generation:
coleenp@548:   // we set a younger_gen card if we have an older->youngest
coleenp@548:   // generation pointer.
coleenp@548:   oop obj = oopDesc::load_decode_heap_oop_not_null(p);
coleenp@548:   if (((HeapWord*)obj < _boundary) && Universe::heap()->is_in_reserved(p)) {
coleenp@548:     _rs->inline_write_ref_field_gc(p, obj);
duke@435:   }
duke@435: }
stefank@2314: 
stefank@2314: #endif // SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP