1 /* 2 * Copyright (c) 2000, 2016, 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.oops; 26 27 import java.io.*; 28 import java.util.*; 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.runtime.*; 31 import sun.jvm.hotspot.types.*; 32 import sun.jvm.hotspot.utilities.*; 33 34 // ConstantPoolCache : A constant pool cache (ConstantPoolCache). 35 // See cpCache.hpp for details about this class. 36 // 37 public class ConstantPoolCache extends Metadata { 38 static { 39 VM.registerVMInitializedObserver(new Observer() { 40 public void update(Observable o, Object data) { 41 initialize(VM.getVM().getTypeDataBase()); 42 } 43 }); 44 } 45 46 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { 47 Type type = db.lookupType("ConstantPoolCache"); 48 constants = new MetadataField(type.getAddressField("_constant_pool"), 0); 49 baseOffset = type.getSize(); 50 Type elType = db.lookupType("ConstantPoolCacheEntry"); 51 elementSize = elType.getSize(); 52 length = new CIntField(type.getCIntegerField("_length"), 0); 53 intSize = VM.getVM().getObjectHeap().getIntSize(); 54 } 55 56 public ConstantPoolCache(Address addr) { 57 super(addr); 58 } 59 60 public boolean isConstantPoolCache() { return true; } 61 62 private static MetadataField constants; 63 64 private static long baseOffset; 65 private static long elementSize; 66 private static CIntField length; 67 private static long intSize; 68 69 70 public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); } 71 72 public long getSize() { 73 return alignSize(baseOffset + getLength() * elementSize); 74 } 75 76 public ConstantPoolCacheEntry getEntryAt(int i) { 77 if (i < 0 || i >= getLength()) throw new IndexOutOfBoundsException(i + " " + getLength()); 78 return new ConstantPoolCacheEntry(this, i); 79 } 80 81 public int getIntAt(int entry, int fld) { 82 long offset = baseOffset + entry * elementSize + fld * intSize; 83 return (int) getAddress().getCIntegerAt(offset, intSize, true ); 84 } 85 86 87 public void printValueOn(PrintStream tty) { 88 tty.print("ConstantPoolCache for " + getConstants().getPoolHolder().getName().asString() + " address = " + getAddress() + " offset = " + baseOffset); 89 } 90 91 public int getLength() { 92 return (int) length.getValue(getAddress()); 93 } 94 95 public void iterateFields(MetadataVisitor visitor) { 96 super.iterateFields(visitor); 97 visitor.doMetadata(constants, true); 98 for (int i = 0; i < getLength(); i++) { 99 ConstantPoolCacheEntry entry = getEntryAt(i); 100 entry.iterateFields(visitor); 101 } 102 } 103 };