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 long gensOffset; 39 private static AddressField genSpecsField; 40 41 private static GenerationFactory genFactory; 42 43 static { 44 VM.registerVMInitializedObserver(new Observer() { 45 public void update(Observable o, Object data) { 46 initialize(VM.getVM().getTypeDataBase()); 47 } 48 }); 49 } 50 51 private static synchronized void initialize(TypeDataBase db) { 52 Type type = db.lookupType("GenCollectedHeap"); 53 54 nGensField = type.getCIntegerField("_n_gens"); 55 gensOffset = type.getField("_gens").getOffset(); 56 genSpecsField = type.getAddressField("_gen_specs"); 57 58 genFactory = new GenerationFactory(); 59 } 60 61 public GenCollectedHeap(Address addr) { 62 super(addr); 63 } 64 65 public int nGens() { 66 return (int) nGensField.getValue(addr); 67 } 68 69 public Generation getGen(int i) { 70 if (Assert.ASSERTS_ENABLED) { 71 Assert.that((i >= 0) && (i < nGens()), "Index " + i + 72 " out of range (should be between 0 and " + nGens() + ")"); 73 } 74 75 if ((i < 0) || (i >= nGens())) { 76 return null; 77 } 78 79 Address genAddr = addr.getAddressAt(gensOffset + 80 (i * VM.getVM().getAddressSize())); 81 return genFactory.newObject(addr.getAddressAt(gensOffset + 82 (i * VM.getVM().getAddressSize()))); 83 } 84 85 public boolean isIn(Address a) { 86 for (int i = 0; i < nGens(); i++) { 87 Generation gen = getGen(i); 88 if (gen.isIn(a)) { 89 return true; 90 } 91 } 92 93 return false; 94 } 95 96 public long capacity() { 97 long capacity = 0; 98 for (int i = 0; i < nGens(); i++) { 99 capacity += getGen(i).capacity(); 100 } 101 return capacity; 102 } 103 104 public long used() { 105 long used = 0; 106 for (int i = 0; i < nGens(); i++) { 107 used += getGen(i).used(); 108 } 109 return used; 110 } 111 112 /** Package-private access to GenerationSpecs */ 113 GenerationSpec spec(int level) { 114 if (Assert.ASSERTS_ENABLED) { 115 Assert.that((level >= 0) && (level < nGens()), "Index " + level + 116 " out of range (should be between 0 and " + nGens() + ")"); 117 } 118 119 if ((level < 0) || (level >= nGens())) { 120 return null; 121 } 122 123 Address ptrList = genSpecsField.getValue(addr); 124 if (ptrList == null) { 125 return null; 126 } 127 return (GenerationSpec) 128 VMObjectFactory.newObject(GenerationSpec.class, 129 ptrList.getAddressAt(level * VM.getVM().getAddressSize())); 130 } 131 132 public CollectedHeapName kind() { 133 return CollectedHeapName.GEN_COLLECTED_HEAP; 134 } 135 136 public void printOn(PrintStream tty) { 137 for (int i = 0; i < nGens(); i++) { 138 tty.print("Gen " + i + ": "); 139 getGen(i).printOn(tty); 140 tty.println("Invocations: " + getGen(i).invocations()); 141 tty.println(); 142 } 143 } 144 }