1 /* 2 * Copyright (c) 2002, 2005, 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.utilities.*; 29 30 public class BytecodeIinc extends BytecodeWideable { BytecodeIinc(Method method, int bci)31 BytecodeIinc(Method method, int bci) { 32 super(method, bci); 33 } 34 getIncrement()35 public int getIncrement() { 36 // increment is signed 37 return (isWide()) ? (int) javaShortAt(3) : (int) javaByteAt(2); 38 } 39 verify()40 public void verify() { 41 if (Assert.ASSERTS_ENABLED) { 42 Assert.that(isValid(), "check iinc"); 43 } 44 } 45 isValid()46 public boolean isValid() { 47 return javaCode() == Bytecodes._iinc; 48 } 49 at(Method method, int bci)50 public static BytecodeIinc at(Method method, int bci) { 51 BytecodeIinc b = new BytecodeIinc(method, bci); 52 if (Assert.ASSERTS_ENABLED) { 53 b.verify(); 54 } 55 return b; 56 } 57 58 /** Like at, but returns null if the BCI is not at iinc */ atCheck(Method method, int bci)59 public static BytecodeIinc atCheck(Method method, int bci) { 60 BytecodeIinc b = new BytecodeIinc(method, bci); 61 return (b.isValid() ? b : null); 62 } 63 at(BytecodeStream bcs)64 public static BytecodeIinc at(BytecodeStream bcs) { 65 return new BytecodeIinc(bcs.method(), bcs.bci()); 66 } 67 toString()68 public String toString() { 69 StringBuffer buf = new StringBuffer(); 70 buf.append("iinc"); 71 buf.append(spaces); 72 buf.append('#'); 73 buf.append(Integer.toString(getLocalVarIndex())); 74 buf.append(" by "); 75 buf.append(Integer.toString(getIncrement())); 76 return buf.toString(); 77 } 78 } 79