1 /* 2 * Copyright (c) 2000, 2015, 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.runtime.*; 32 import sun.jvm.hotspot.types.*; 33 import sun.jvm.hotspot.utilities.*; 34 35 public class GenCollectedHeap extends CollectedHeap { 36 private static AddressField youngGenField; 37 private static AddressField oldGenField; 38 39 private static AddressField youngGenSpecField; 40 private static AddressField oldGenSpecField; 41 42 private static GenerationFactory genFactory; 43 44 static { 45 VM.registerVMInitializedObserver(new Observer() { 46 public void update(Observable o, Object data) { 47 initialize(VM.getVM().getTypeDataBase()); 48 } 49 }); 50 } 51 52 private static synchronized void initialize(TypeDataBase db) { 53 Type type = db.lookupType("GenCollectedHeap"); 54 55 youngGenField = type.getAddressField("_young_gen"); 56 oldGenField = type.getAddressField("_old_gen"); 57 58 genFactory = new GenerationFactory(); 59 60 Type collectorPolicyType = db.lookupType("GenCollectorPolicy"); 61 youngGenSpecField = collectorPolicyType.getAddressField("_young_gen_spec"); 62 oldGenSpecField = collectorPolicyType.getAddressField("_old_gen_spec"); 63 } 64 65 public GenCollectedHeap(Address addr) { 66 super(addr); 67 } 68 69 public int nGens() { 70 return 2; // Young + Old 71 } 72 73 public Generation getGen(int i) { 74 if (Assert.ASSERTS_ENABLED) { 75 Assert.that((i == 0) || (i == 1), "Index " + i + 76 " out of range (should be 0 or 1)"); 77 } 78 79 switch (i) { 80 case 0: 81 return genFactory.newObject(youngGenField.getValue(addr)); 82 case 1: 83 return genFactory.newObject(oldGenField.getValue(addr)); 84 default: 85 // no generation for i, and assertions disabled. 86 return null; 87 } 88 } 89 90 public boolean isIn(Address a) { 91 for (int i = 0; i < nGens(); i++) { 92 Generation gen = getGen(i); 93 if (gen.isIn(a)) { 94 return true; 95 } 96 } 97 98 return false; 99 } 100 101 public long capacity() { 102 long capacity = 0; 103 for (int i = 0; i < nGens(); i++) { 104 capacity += getGen(i).capacity(); 105 } 106 return capacity; 107 } 108 109 public long used() { 110 long used = 0; 111 for (int i = 0; i < nGens(); i++) { 112 used += getGen(i).used(); 113 } 114 return used; 115 } 116 117 /** Package-private access to GenerationSpecs */ 118 GenerationSpec spec(int level) { 119 if (Assert.ASSERTS_ENABLED) { 120 Assert.that((level == 0) || (level == 1), "Index " + level + 121 " out of range (should be 0 or 1)"); 122 } 123 124 if ((level != 0) && (level != 1)) { 125 return null; 126 } 127 128 if (level == 0) { 129 return (GenerationSpec) 130 VMObjectFactory.newObject(GenerationSpec.class, 131 youngGenSpecField.getAddress()); 132 } else { 133 return (GenerationSpec) 134 VMObjectFactory.newObject(GenerationSpec.class, 135 oldGenSpecField.getAddress()); 136 } 137 } 138 139 public CollectedHeapName kind() { 140 return CollectedHeapName.GEN_COLLECTED_HEAP; 141 } 142 143 public void printOn(PrintStream tty) { 144 for (int i = 0; i < nGens(); i++) { 145 tty.print("Gen " + i + ": "); 146 getGen(i).printOn(tty); 147 tty.println("Invocations: " + getGen(i).invocations()); 148 tty.println(); 149 } 150 } 151 }