1 /*
2 * Copyright (c) 2017, 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 */
106 #ifdef ASSERT
107 virtual bool should_verify_oops() {
108 return false;
109 }
110 #endif
111 };
112
113 ZHeapIterator::ZHeapIterator(bool visit_referents) :
114 _visit_stack(),
115 _visit_map(),
116 _visit_referents(visit_referents) {}
117
118 ZHeapIterator::~ZHeapIterator() {
119 ZVisitMapIterator iter(&_visit_map);
120 for (ZHeapIteratorBitMap* map; iter.next(&map);) {
121 delete map;
122 }
123 }
124
125 static size_t object_index_max() {
126 return ZPageSizeMin >> ZObjectAlignmentSmallShift;
127 }
128
129 static size_t object_index(oop obj) {
130 const uintptr_t addr = ZOop::to_address(obj);
131 const uintptr_t offset = ZAddress::offset(addr);
132 const uintptr_t mask = (1 << ZPageSizeMinShift) - 1;
133 return (offset & mask) >> ZObjectAlignmentSmallShift;
134 }
135
136 ZHeapIteratorBitMap* ZHeapIterator::object_map(oop obj) {
137 const uintptr_t addr = ZOop::to_address(obj);
138 ZHeapIteratorBitMap* map = _visit_map.get(addr);
139 if (map == NULL) {
140 map = new ZHeapIteratorBitMap(object_index_max());
141 _visit_map.put(addr, map);
142 }
143
144 return map;
145 }
146
147 void ZHeapIterator::push(oop obj) {
148 if (obj == NULL) {
149 // Ignore
150 return;
151 }
152
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1 /*
2 * Copyright (c) 2017, 2019, 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 */
106 #ifdef ASSERT
107 virtual bool should_verify_oops() {
108 return false;
109 }
110 #endif
111 };
112
113 ZHeapIterator::ZHeapIterator(bool visit_referents) :
114 _visit_stack(),
115 _visit_map(),
116 _visit_referents(visit_referents) {}
117
118 ZHeapIterator::~ZHeapIterator() {
119 ZVisitMapIterator iter(&_visit_map);
120 for (ZHeapIteratorBitMap* map; iter.next(&map);) {
121 delete map;
122 }
123 }
124
125 static size_t object_index_max() {
126 return ZGranuleSize >> ZObjectAlignmentSmallShift;
127 }
128
129 static size_t object_index(oop obj) {
130 const uintptr_t addr = ZOop::to_address(obj);
131 const uintptr_t offset = ZAddress::offset(addr);
132 const uintptr_t mask = ZGranuleSize - 1;
133 return (offset & mask) >> ZObjectAlignmentSmallShift;
134 }
135
136 ZHeapIteratorBitMap* ZHeapIterator::object_map(oop obj) {
137 const uintptr_t addr = ZOop::to_address(obj);
138 ZHeapIteratorBitMap* map = _visit_map.get(addr);
139 if (map == NULL) {
140 map = new ZHeapIteratorBitMap(object_index_max());
141 _visit_map.put(addr, map);
142 }
143
144 return map;
145 }
146
147 void ZHeapIterator::push(oop obj) {
148 if (obj == NULL) {
149 // Ignore
150 return;
151 }
152
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