1 /* 2 * Copyright (c) 2007, 2018, 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 #ifndef SHARE_VM_GC_CMS_PAROOPCLOSURES_INLINE_HPP 26 #define SHARE_VM_GC_CMS_PAROOPCLOSURES_INLINE_HPP 27 28 #include "gc/cms/cmsHeap.hpp" 29 #include "gc/cms/parNewGeneration.hpp" 30 #include "gc/cms/parOopClosures.hpp" 31 #include "gc/shared/cardTableRS.hpp" 32 #include "gc/shared/genOopClosures.inline.hpp" 33 #include "logging/log.hpp" 34 #include "logging/logStream.hpp" 35 #include "oops/access.inline.hpp" 36 #include "oops/compressedOops.inline.hpp" 37 #include "oops/oop.inline.hpp" 38 39 template <class T> inline void ParScanWeakRefClosure::do_oop_work(T* p) { 40 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p); 41 // weak references are sometimes scanned twice; must check 42 // that to-space doesn't already contain this object 43 if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) { 44 // we need to ensure that it is copied (see comment in 45 // ParScanClosure::do_oop_work). 46 Klass* objK = obj->klass(); 47 markOop m = obj->mark_raw(); 48 oop new_obj; 49 if (m->is_marked()) { // Contains forwarding pointer. 50 new_obj = ParNewGeneration::real_forwardee(obj); 51 } else { 52 size_t obj_sz = obj->size_given_klass(objK); 53 new_obj = ((ParNewGeneration*)_g)->copy_to_survivor_space(_par_scan_state, 54 obj, obj_sz, m); 55 } 56 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj); 57 } 58 } 59 60 inline void ParScanWeakRefClosure::do_oop(oop* p) { ParScanWeakRefClosure::do_oop_work(p); } 61 inline void ParScanWeakRefClosure::do_oop(narrowOop* p) { ParScanWeakRefClosure::do_oop_work(p); } 62 63 template <class T> inline void ParScanClosure::par_do_barrier(T* p) { 64 assert(generation()->is_in_reserved(p), "expected ref in generation"); 65 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p); 66 // If p points to a younger generation, mark the card. 67 if ((HeapWord*)obj < gen_boundary()) { 68 rs()->write_ref_field_gc_par(p, obj); 69 } 70 } 71 72 template <class T> 73 inline void ParScanClosure::do_oop_work(T* p, 74 bool gc_barrier, 75 bool root_scan) { 76 assert((!CMSHeap::heap()->is_in_reserved(p) || 77 generation()->is_in_reserved(p)) 78 && (CMSHeap::heap()->is_young_gen(generation()) || gc_barrier), 79 "The gen must be right, and we must be doing the barrier " 80 "in older generations."); 81 T heap_oop = RawAccess<>::oop_load(p); 82 if (!CompressedOops::is_null(heap_oop)) { 83 oop obj = CompressedOops::decode_not_null(heap_oop); 84 if ((HeapWord*)obj < _boundary) { 85 #ifndef PRODUCT 86 if (_g->to()->is_in_reserved(obj)) { 87 Log(gc) log; 88 log.error("Scanning field (" PTR_FORMAT ") twice?", p2i(p)); 89 CMSHeap* heap = CMSHeap::heap(); 90 Space* sp = heap->space_containing(p); 91 oop obj = oop(sp->block_start(p)); 92 assert((HeapWord*)obj < (HeapWord*)p, "Error"); 93 log.error("Object: " PTR_FORMAT, p2i((void *)obj)); 94 log.error("-------"); 95 LogStream ls(log.error()); 96 oopDesc::print_on(&ls, obj); 97 log.error("-----"); 98 log.error("Heap:"); 99 log.error("-----"); 100 heap->print_on(&ls); 101 ShouldNotReachHere(); 102 } 103 #endif 104 // OK, we need to ensure that it is copied. 105 // We read the klass and mark in this order, so that we can reliably 106 // get the size of the object: if the mark we read is not a 107 // forwarding pointer, then the klass is valid: the klass is only 108 // overwritten with an overflow next pointer after the object is 109 // forwarded. 110 Klass* objK = obj->klass(); 111 markOop m = obj->mark_raw(); 112 oop new_obj; 113 if (m->is_marked()) { // Contains forwarding pointer. 114 new_obj = ParNewGeneration::real_forwardee(obj); 115 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj); 116 log_develop_trace(gc, scavenge)("{%s %s ( " PTR_FORMAT " ) " PTR_FORMAT " -> " PTR_FORMAT " (%d)}", 117 "forwarded ", 118 new_obj->klass()->internal_name(), p2i(p), p2i((void *)obj), p2i((void *)new_obj), new_obj->size()); 119 } else { 120 size_t obj_sz = obj->size_given_klass(objK); 121 new_obj = _g->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m); 122 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj); 123 if (root_scan) { 124 // This may have pushed an object. If we have a root 125 // category with a lot of roots, can't let the queue get too 126 // full: 127 (void)_par_scan_state->trim_queues(10 * ParallelGCThreads); 128 } 129 } 130 if (is_scanning_a_cld()) { 131 do_cld_barrier(); 132 } else if (gc_barrier) { 133 // Now call parent closure 134 par_do_barrier(p); 135 } 136 } 137 } 138 } 139 140 inline void ParScanWithBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, true, false); } 141 inline void ParScanWithBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, true, false); } 142 143 inline void ParScanWithoutBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, false, false); } 144 inline void ParScanWithoutBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, false, false); } 145 146 #endif // SHARE_VM_GC_CMS_PAROOPCLOSURES_INLINE_HPP