1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/memory/defNewGeneration.inline.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,90 @@
1.4 +/*
1.5 + * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP
1.29 +#define SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP
1.30 +
1.31 +#include "memory/cardTableRS.hpp"
1.32 +#include "memory/defNewGeneration.hpp"
1.33 +#include "memory/space.hpp"
1.34 +
1.35 +// Methods of protected closure types
1.36 +
1.37 +template <class T>
1.38 +inline void DefNewGeneration::KeepAliveClosure::do_oop_work(T* p) {
1.39 +#ifdef ASSERT
1.40 + {
1.41 + // We never expect to see a null reference being processed
1.42 + // as a weak reference.
1.43 + assert (!oopDesc::is_null(*p), "expected non-null ref");
1.44 + oop obj = oopDesc::load_decode_heap_oop_not_null(p);
1.45 + assert (obj->is_oop(), "expected an oop while scanning weak refs");
1.46 + }
1.47 +#endif // ASSERT
1.48 +
1.49 + _cl->do_oop_nv(p);
1.50 +
1.51 + // Card marking is trickier for weak refs.
1.52 + // This oop is a 'next' field which was filled in while we
1.53 + // were discovering weak references. While we might not need
1.54 + // to take a special action to keep this reference alive, we
1.55 + // will need to dirty a card as the field was modified.
1.56 + //
1.57 + // Alternatively, we could create a method which iterates through
1.58 + // each generation, allowing them in turn to examine the modified
1.59 + // field.
1.60 + //
1.61 + // We could check that p is also in an older generation, but
1.62 + // dirty cards in the youngest gen are never scanned, so the
1.63 + // extra check probably isn't worthwhile.
1.64 + if (Universe::heap()->is_in_reserved(p)) {
1.65 + oop obj = oopDesc::load_decode_heap_oop_not_null(p);
1.66 + _rs->inline_write_ref_field_gc(p, obj);
1.67 + }
1.68 +}
1.69 +
1.70 +template <class T>
1.71 +inline void DefNewGeneration::FastKeepAliveClosure::do_oop_work(T* p) {
1.72 +#ifdef ASSERT
1.73 + {
1.74 + // We never expect to see a null reference being processed
1.75 + // as a weak reference.
1.76 + assert (!oopDesc::is_null(*p), "expected non-null ref");
1.77 + oop obj = oopDesc::load_decode_heap_oop_not_null(p);
1.78 + assert (obj->is_oop(), "expected an oop while scanning weak refs");
1.79 + }
1.80 +#endif // ASSERT
1.81 +
1.82 + _cl->do_oop_nv(p);
1.83 +
1.84 + // Optimized for Defnew generation if it's the youngest generation:
1.85 + // we set a younger_gen card if we have an older->youngest
1.86 + // generation pointer.
1.87 + oop obj = oopDesc::load_decode_heap_oop_not_null(p);
1.88 + if (((HeapWord*)obj < _boundary) && Universe::heap()->is_in_reserved(p)) {
1.89 + _rs->inline_write_ref_field_gc(p, obj);
1.90 + }
1.91 +}
1.92 +
1.93 +#endif // SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP
