1 /* 2 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef GC_SHARED_FULLGCFORWARDING_INLINE_HPP 26 #define GC_SHARED_FULLGCFORWARDING_INLINE_HPP 27 28 #include "gc/shared/fullGCForwarding.hpp" 29 30 #include "oops/oop.inline.hpp" 31 #include "utilities/globalDefinitions.hpp" 32 33 void FullGCForwarding::forward_to(oop from, oop to) { 34 #ifdef _LP64 35 uintptr_t encoded = pointer_delta(cast_from_oop<HeapWord*>(to), _heap_base) << Shift; 36 assert(encoded <= static_cast<uintptr_t>(right_n_bits(_num_low_bits)), "encoded forwardee must fit"); 37 uintptr_t mark = from->mark().value(); 38 mark &= ~right_n_bits(_num_low_bits); 39 mark |= (encoded | markWord::marked_value); 40 from->set_mark(markWord(mark)); 41 #else 42 from->forward_to(to); 43 #endif 44 } 45 46 oop FullGCForwarding::forwardee(oop from) { 47 #ifdef _LP64 48 uintptr_t mark = from->mark().value(); 49 HeapWord* decoded = _heap_base + ((mark & right_n_bits(_num_low_bits)) >> Shift); 50 return cast_to_oop(decoded); 51 #else 52 return from->forwardee(); 53 #endif 54 } 55 56 bool FullGCForwarding::is_forwarded(oop obj) { 57 return obj->mark().is_forwarded(); 58 } 59 60 #endif // GC_SHARED_FULLGCFORWARDING_INLINE_HPP