1 /* 2 * Copyright (c) 2000, 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.shared; 26 27 import java.io.*; 28 import java.util.*; 29 30 import sun.jvm.hotspot.debugger.*; 31 import sun.jvm.hotspot.gc.shared.*; 32 import sun.jvm.hotspot.runtime.*; 33 import sun.jvm.hotspot.types.*; 34 import sun.jvm.hotspot.utilities.*; 35 36 abstract public class GenCollectedHeap extends CollectedHeap { 37 private static AddressField youngGenField; 38 private static AddressField oldGenField; 39 40 private static AddressField youngGenSpecField; 41 private static AddressField oldGenSpecField; 42 43 private static GenerationFactory genFactory; 44 45 static { 46 VM.registerVMInitializedObserver(new Observer() { 47 public void update(Observable o, Object data) { 48 initialize(VM.getVM().getTypeDataBase()); 49 } 50 }); 51 } 52 53 private static synchronized void initialize(TypeDataBase db) { 54 Type type = db.lookupType("GenCollectedHeap"); 55 56 youngGenField = type.getAddressField("_young_gen"); 57 oldGenField = type.getAddressField("_old_gen"); 58 youngGenSpecField = type.getAddressField("_young_gen_spec"); 59 oldGenSpecField = type.getAddressField("_old_gen_spec"); 60 61 genFactory = new GenerationFactory(); 62 } 63 64 public GenCollectedHeap(Address addr) { 65 super(addr); 66 } 67 68 public int nGens() { 69 return 2; // Young + Old 70 } 71 72 public Generation getGen(int i) { 73 if (Assert.ASSERTS_ENABLED) { 74 Assert.that((i == 0) || (i == 1), "Index " + i + 75 " out of range (should be 0 or 1)"); 76 } 77 78 switch (i) { 79 case 0: 80 return genFactory.newObject(youngGenField.getValue(addr)); 81 case 1: 82 return genFactory.newObject(oldGenField.getValue(addr)); 83 default: 84 // no generation for i, and assertions disabled. 85 return null; 86 } 87 } 88 89 public boolean isIn(Address a) { 90 for (int i = 0; i < nGens(); i++) { 91 Generation gen = getGen(i); 92 if (gen.isIn(a)) { 93 return true; 94 } 95 } 96 97 return false; 98 } 99 100 public long capacity() { 101 long capacity = 0; 102 for (int i = 0; i < nGens(); i++) { 103 capacity += getGen(i).capacity(); 104 } 105 return capacity; 106 } 107 108 public long used() { 109 long used = 0; 110 for (int i = 0; i < nGens(); i++) { 111 used += getGen(i).used(); 112 } 113 return used; 114 } 115 116 /** Package-private access to GenerationSpecs */ 117 GenerationSpec spec(int level) { 118 if (Assert.ASSERTS_ENABLED) { 119 Assert.that((level == 0) || (level == 1), "Index " + level + 120 " out of range (should be 0 or 1)"); 121 } 122 123 if ((level != 0) && (level != 1)) { 124 return null; 125 } 126 127 if (level == 0) { 128 return (GenerationSpec) 129 VMObjectFactory.newObject(GenerationSpec.class, 130 youngGenSpecField.getAddress()); 131 } else { 132 return (GenerationSpec) 133 VMObjectFactory.newObject(GenerationSpec.class, 134 oldGenSpecField.getAddress()); 135 } 136 } 137 138 public void liveRegionsIterate(LiveRegionsClosure closure) { 139 // Run through all generations, obtaining bottom-top pairs. 140 for (int i = 0; i < nGens(); i++) { 141 Generation gen = getGen(i); 142 gen.liveRegionsIterate(closure); 143 } 144 } 145 146 public void printOn(PrintStream tty) { 147 for (int i = 0; i < nGens(); i++) { 148 tty.print("Gen " + i + ": "); 149 getGen(i).printOn(tty); 150 tty.println("Invocations: " + getGen(i).invocations()); 151 tty.println(); 152 } 153 } 154 }