1 /* 2 * Copyright (c) 2015, 2018, Red Hat, Inc. All rights reserved. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP 25 #define SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP 26 27 #include "gc/shenandoah/shenandoahAsserts.hpp" 28 #include "gc/shenandoah/shenandoahForwarding.hpp" 29 #include "oops/markOop.inline.hpp" 30 #include "runtime/atomic.hpp" 31 32 inline HeapWord* ShenandoahForwarding::get_forwardee_raw(oop obj) { 33 shenandoah_assert_in_heap(NULL, obj); 34 return get_forwardee_raw_unchecked(obj); 35 } 36 37 inline HeapWord* ShenandoahForwarding::get_forwardee_raw_unchecked(oop obj) { 38 markOop mark = obj->mark_raw(); 39 if (mark->is_marked()) { 40 return (HeapWord*) mark->clear_lock_bits(); 41 } else { 42 return (HeapWord*) obj; 43 } 44 } 45 46 inline oop ShenandoahForwarding::get_forwardee(oop obj) { 47 shenandoah_assert_correct(NULL, obj); 48 return oop(get_forwardee_raw_unchecked(obj)); 49 } 50 51 inline bool ShenandoahForwarding::is_forwarded(oop obj) { 52 return obj->mark_raw()->is_marked(); 53 } 54 55 inline oop ShenandoahForwarding::try_update_forwardee(oop obj, oop update) { 56 markOop old_mark = obj->mark_raw(); 57 if (old_mark->is_marked()) { 58 return (oop) old_mark->clear_lock_bits(); 59 } 60 61 markOop new_mark = markOopDesc::encode_pointer_as_mark(update); 62 markOop prev_mark = obj->cas_set_mark_raw(new_mark, old_mark); 63 if (prev_mark == old_mark) { 64 return obj; 65 } else { 66 return (oop) prev_mark->clear_lock_bits(); 67 } 68 } 69 70 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP