1 /* 2 * Copyright (c) 2000, 2012, 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.memory; 26 27 import java.io.*; 28 import java.util.*; 29 30 import sun.jvm.hotspot.debugger.*; 31 import sun.jvm.hotspot.gc_interface.*; 32 import sun.jvm.hotspot.runtime.*; 33 import sun.jvm.hotspot.types.*; 34 import sun.jvm.hotspot.utilities.*; 35 36 public class GenCollectedHeap extends SharedHeap { 37 private static CIntegerField nGensField; 38 private static AddressField youngGenField; 39 private static AddressField oldGenField; 40 private static AddressField genSpecsField; 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 nGensField = type.getCIntegerField("_n_gens"); 56 youngGenField = type.getAddressField("_young_gen"); 57 oldGenField = type.getAddressField("_old_gen"); 58 genSpecsField = type.getAddressField("_gen_specs"); 59 60 genFactory = new GenerationFactory(); 61 } 62 63 public GenCollectedHeap(Address addr) { 64 super(addr); 65 } 66 67 public int nGens() { 68 return (int) nGensField.getValue(addr); 69 } 70 71 public Generation getGen(int i) { 72 if (Assert.ASSERTS_ENABLED) { 73 Assert.that((i >= 0) && (i < nGens()), "Index " + i + 74 " out of range (should be between 0 and " + nGens() + ")"); 75 } 76 77 switch (i) { 78 case 0: 79 return genFactory.newObject(youngGenField.getAddress()); 80 case 1: 81 return genFactory.newObject(oldGenField.getAddress()); 82 default: 83 // no generation for i, and assertions disabled. 84 return null; 85 } 86 } 87 88 public boolean isIn(Address a) { 89 for (int i = 0; i < nGens(); i++) { 90 Generation gen = getGen(i); 91 if (gen.isIn(a)) { 92 return true; 93 } 94 } 95 96 return false; 97 } 98 99 public long capacity() { 100 long capacity = 0; 101 for (int i = 0; i < nGens(); i++) { 102 capacity += getGen(i).capacity(); 103 } 104 return capacity; 105 } 106 107 public long used() { 108 long used = 0; 109 for (int i = 0; i < nGens(); i++) { 110 used += getGen(i).used(); 111 } 112 return used; 113 } 114 115 /** Package-private access to GenerationSpecs */ 116 GenerationSpec spec(int level) { 117 if (Assert.ASSERTS_ENABLED) { 118 Assert.that((level >= 0) && (level < nGens()), "Index " + level + 119 " out of range (should be between 0 and " + nGens() + ")"); 120 } 121 122 if ((level < 0) || (level >= nGens())) { 123 return null; 124 } 125 126 Address ptrList = genSpecsField.getValue(addr); 127 if (ptrList == null) { 128 return null; 129 } 130 return (GenerationSpec) 131 VMObjectFactory.newObject(GenerationSpec.class, 132 ptrList.getAddressAt(level * VM.getVM().getAddressSize())); 133 } 134 135 public CollectedHeapName kind() { 136 return CollectedHeapName.GEN_COLLECTED_HEAP; 137 } 138 139 public void printOn(PrintStream tty) { 140 for (int i = 0; i < nGens(); i++) { 141 tty.print("Gen " + i + ": "); 142 getGen(i).printOn(tty); 143 tty.println("Invocations: " + getGen(i).invocations()); 144 tty.println(); 145 } 146 } 147 }