1 /* 2 * Copyright (c) 2005, 2008, Oracle and/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 inline void oopDesc::update_contents(ParCompactionManager* cm) { 26 // The klass field must be updated before anything else 27 // can be done. 28 DEBUG_ONLY(klassOopDesc* original_klass = klass()); 29 30 // Can the option to update and/or copy be moved up in the 31 // call chain to avoid calling into here? 32 33 if (PSParallelCompact::should_update_klass(klass())) { 34 update_header(); 35 assert(klass()->is_klass(), "Not updated correctly"); 36 } else { 37 assert(klass()->is_klass(), "Not updated"); 38 } 39 40 Klass* new_klass = blueprint(); 41 if (!new_klass->oop_is_typeArray()) { 42 // It might contain oops beyond the header, so take the virtual call. 43 new_klass->oop_update_pointers(cm, this); 44 } 45 // Else skip it. The typeArrayKlass in the header never needs scavenging. 46 } 47 48 inline void oopDesc::update_contents(ParCompactionManager* cm, 49 HeapWord* begin_limit, 50 HeapWord* end_limit) { 51 // The klass field must be updated before anything else 52 // can be done. 53 debug_only(klassOopDesc* original_klass = klass()); 54 55 update_contents(cm, klass(), begin_limit, end_limit); 56 } 57 58 inline void oopDesc::update_contents(ParCompactionManager* cm, 59 klassOop old_klass, 60 HeapWord* begin_limit, 61 HeapWord* end_limit) { 62 63 klassOop updated_klass = 64 PSParallelCompact::summary_data().calc_new_klass(old_klass); 65 66 // Needs to be boundary aware for the 64 bit case 67 // update_header(); 68 // The klass has moved. Is the location of the klass 69 // within the limits? 70 if ((((HeapWord*)&_metadata._klass) >= begin_limit) && 71 (((HeapWord*)&_metadata._klass) < end_limit)) { 72 set_klass(updated_klass); 73 } 74 75 Klass* klass = updated_klass->klass_part(); 76 if (!klass->oop_is_typeArray()) { 77 // It might contain oops beyond the header, so take the virtual call. 78 klass->oop_update_pointers(cm, this, begin_limit, end_limit); 79 } 80 // Else skip it. The typeArrayKlass in the header never needs scavenging. 81 } 82 83 inline void oopDesc::follow_contents(ParCompactionManager* cm) { 84 assert (PSParallelCompact::mark_bitmap()->is_marked(this), 85 "should be marked"); 86 blueprint()->oop_follow_contents(cm, this); 87 } 88 89 // Used by parallel old GC. 90 91 inline void oopDesc::follow_header(ParCompactionManager* cm) { 92 if (UseCompressedOops) { 93 PSParallelCompact::mark_and_push(cm, compressed_klass_addr()); 94 } else { 95 PSParallelCompact::mark_and_push(cm, klass_addr()); 96 } 97 } 98 99 inline oop oopDesc::forward_to_atomic(oop p) { 100 assert(ParNewGeneration::is_legal_forward_ptr(p), 101 "illegal forwarding pointer value."); 102 markOop oldMark = mark(); 103 markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p); 104 markOop curMark; 105 106 assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable"); 107 assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this."); 108 109 while (!is_forwarded()) { 110 curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark); 111 if (curMark == oldMark) { 112 assert(is_forwarded(), "the CAS should have succeeded."); 113 return NULL; 114 } 115 oldMark = curMark; 116 } 117 return forwardee(); 118 } 119 120 inline void oopDesc::update_header() { 121 if (UseCompressedOops) { 122 PSParallelCompact::adjust_pointer(compressed_klass_addr()); 123 } else { 124 PSParallelCompact::adjust_pointer(klass_addr()); 125 } 126 } 127 128 inline void oopDesc::update_header(HeapWord* beg_addr, HeapWord* end_addr) { 129 if (UseCompressedOops) { 130 PSParallelCompact::adjust_pointer(compressed_klass_addr(), 131 beg_addr, end_addr); 132 } else { 133 PSParallelCompact::adjust_pointer(klass_addr(), beg_addr, end_addr); 134 } 135 }