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 * 23 */ 24 25 package sun.jvm.hotspot.gc.z; 26 27 import java.io.PrintStream; 28 import java.util.Iterator; 29 30 import sun.jvm.hotspot.debugger.Address; 31 import sun.jvm.hotspot.debugger.OopHandle; 32 import sun.jvm.hotspot.gc.shared.CollectedHeap; 33 import sun.jvm.hotspot.gc.shared.CollectedHeapName; 34 import sun.jvm.hotspot.gc.shared.LiveRegionsClosure; 35 import sun.jvm.hotspot.runtime.VM; 36 import sun.jvm.hotspot.runtime.VMObjectFactory; 37 import sun.jvm.hotspot.types.Type; 38 import sun.jvm.hotspot.types.TypeDataBase; 39 import sun.jvm.hotspot.utilities.BitMapInterface; 40 41 // Mirror class for ZCollectedHeap. 42 43 public class ZCollectedHeap extends CollectedHeap { 44 private static long zHeapFieldOffset; 45 46 static { 47 VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase())); 48 } 49 50 private static synchronized void initialize(TypeDataBase db) { 51 Type type = db.lookupType("ZCollectedHeap"); 52 53 zHeapFieldOffset = type.getAddressField("_heap").getOffset(); 54 } 55 56 public ZHeap heap() { 57 Address heapAddr = addr.addOffsetTo(zHeapFieldOffset); 58 return (ZHeap)VMObjectFactory.newObject(ZHeap.class, heapAddr); 59 } 60 61 @Override 62 public CollectedHeapName kind() { 63 return CollectedHeapName.Z; 64 } 65 66 @Override 67 public void printOn(PrintStream tty) { 68 heap().printOn(tty); 69 } 70 71 public ZCollectedHeap(Address addr) { 72 super(addr); 73 } 74 75 @Override 76 public long capacity() { 77 return heap().capacity(); 78 } 79 80 @Override 81 public long used() { 82 return heap().used(); 83 } 84 85 86 87 private OopHandle oop_load_barrier(Address oopAddress) { 88 oopAddress = ZBarrier.weak_barrier(oopAddress); 89 if (oopAddress == null) { 90 return null; 91 } 92 93 return oopAddress.addOffsetToAsOopHandle(0); 94 } 95 96 @Override 97 public OopHandle oop_load_at(OopHandle handle, long offset) { 98 assert(!VM.getVM().isCompressedOopsEnabled()); 99 100 Address oopAddress = handle.getAddressAt(offset); 101 102 return oop_load_barrier(oopAddress); 103 } 104 105 // addr can be either in heap or in native 106 @Override 107 public OopHandle oop_load_in_native(Address addr) { 108 Address oopAddress = addr.getAddressAt(0); 109 110 return oop_load_barrier(oopAddress); 111 } 112 113 public String oopAddressDescription(OopHandle handle) { 114 Address origOop = ZOop.to_address(handle); 115 Address loadBarrieredOop = ZBarrier.weak_barrier(origOop); 116 if (!origOop.equals(loadBarrieredOop)) { 117 return origOop + " (" + loadBarrieredOop.toString() + ")"; 118 } else { 119 return handle.toString(); 120 } 121 } 122 123 @Override 124 public void liveRegionsIterate(LiveRegionsClosure closure) { 125 Iterator<ZPage> iter = heap().pageTable().activePagesIterator(); 126 while (iter.hasNext()) { 127 ZPage page = iter.next(); 128 closure.doLiveRegions(page); 129 } 130 } 131 132 @Override 133 public BitMapInterface createBitMap(long size) { 134 // Ignores the size 135 return new ZExternalBitMap(this); 136 } 137 }