102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
/*
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* Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP
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#define SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP
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#include "gc/serial/defNewGeneration.hpp"
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#include "gc/shared/cardTableRS.hpp"
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#include "gc/shared/genCollectedHeap.hpp"
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#include "gc/shared/genOopClosures.inline.hpp"
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#include "gc/shared/space.inline.hpp"
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#include "oops/access.inline.hpp"
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// Methods of protected closure types
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template <class T>
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inline void DefNewGeneration::KeepAliveClosure::do_oop_work(T* p) {
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#ifdef ASSERT
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{
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// We never expect to see a null reference being processed
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// as a weak reference.
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oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
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assert (oopDesc::is_oop(obj), "expected an oop while scanning weak refs");
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}
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#endif // ASSERT
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Devirtualizer::do_oop_no_verify(_cl, p);
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// Card marking is trickier for weak refs.
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// This oop is a 'next' field which was filled in while we
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// were discovering weak references. While we might not need
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// to take a special action to keep this reference alive, we
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// will need to dirty a card as the field was modified.
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//
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// Alternatively, we could create a method which iterates through
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// each generation, allowing them in turn to examine the modified
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// field.
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//
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// We could check that p is also in the old generation, but
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// dirty cards in the young gen are never scanned, so the
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// extra check probably isn't worthwhile.
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if (GenCollectedHeap::heap()->is_in_reserved(p)) {
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oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
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_rs->inline_write_ref_field_gc(p, obj);
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}
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}
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template <class T>
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inline void DefNewGeneration::FastKeepAliveClosure::do_oop_work(T* p) {
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#ifdef ASSERT
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{
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// We never expect to see a null reference being processed
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// as a weak reference.
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oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
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assert (oopDesc::is_oop(obj), "expected an oop while scanning weak refs");
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}
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#endif // ASSERT
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Devirtualizer::do_oop_no_verify(_cl, p);
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// Optimized for Defnew generation if it's the youngest generation:
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// we set a younger_gen card if we have an older->youngest
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// generation pointer.
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oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
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if (((HeapWord*)obj < _boundary) && GenCollectedHeap::heap()->is_in_reserved(p)) {
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_rs->inline_write_ref_field_gc(p, obj);
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}
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}
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template <typename OopClosureType>
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void DefNewGeneration::oop_since_save_marks_iterate(OopClosureType* cl) {
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cl->set_generation(this);
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eden()->oop_since_save_marks_iterate(cl);
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to()->oop_since_save_marks_iterate(cl);
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from()->oop_since_save_marks_iterate(cl);
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cl->reset_generation();
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save_marks();
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}
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#endif // SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP
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