1 /* 2 * Copyright (c) 2002, 2010, 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.interpreter; 26 27 import sun.jvm.hotspot.oops.*; 28 import sun.jvm.hotspot.runtime.*; 29 30 // any bytecode with constant pool index 31 32 public abstract class BytecodeWithCPIndex extends Bytecode { 33 BytecodeWithCPIndex(Method method, int bci) { 34 super(method, bci); 35 } 36 37 // the constant pool index for this bytecode 38 public int index() { return 0xFFFF & javaShortAt(1); } 39 40 public int getSecondaryIndex() { 41 throw new IllegalArgumentException("must be invokedynamic"); 42 } 43 44 protected int indexForFieldOrMethod() { 45 ConstantPoolCache cpCache = method().getConstants().getCache(); 46 // get ConstantPool index from ConstantPoolCacheIndex at given bci 47 int cpCacheIndex = index(); 48 if (cpCache == null) { 49 return cpCacheIndex; 50 } else if (code() == Bytecodes._invokedynamic) { 51 int secondaryIndex = getSecondaryIndex(); 52 return cpCache.getMainEntryAt(secondaryIndex).getConstantPoolIndex(); 53 } else { 54 // change byte-ordering and go via cache 55 return cpCache.getEntryAt((int) (0xFFFF & VM.getVM().getBytes().swapShort((short) cpCacheIndex))).getConstantPoolIndex(); 56 } 57 } 58 }