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1 /*
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2 * Copyright 2002-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.interpreter;
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26
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27 import sun.jvm.hotspot.oops.*;
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28 import sun.jvm.hotspot.utilities.*;
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29
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30 public class BytecodeIinc extends BytecodeWideable {
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31 BytecodeIinc(Method method, int bci) {
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32 super(method, bci);
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33 }
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34
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35 public int getIncrement() {
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36 // increment is signed
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37 return (isWide()) ? (int) javaShortAt(3) : (int) javaByteAt(2);
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38 }
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39
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40 public void verify() {
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41 if (Assert.ASSERTS_ENABLED) {
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42 Assert.that(isValid(), "check iinc");
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43 }
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44 }
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45
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46 public boolean isValid() {
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47 return javaCode() == Bytecodes._iinc;
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48 }
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49
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50 public static BytecodeIinc at(Method method, int bci) {
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51 BytecodeIinc b = new BytecodeIinc(method, bci);
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52 if (Assert.ASSERTS_ENABLED) {
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53 b.verify();
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54 }
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55 return b;
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56 }
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57
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58 /** Like at, but returns null if the BCI is not at iinc */
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59 public static BytecodeIinc atCheck(Method method, int bci) {
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60 BytecodeIinc b = new BytecodeIinc(method, bci);
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61 return (b.isValid() ? b : null);
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62 }
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63
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64 public static BytecodeIinc at(BytecodeStream bcs) {
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65 return new BytecodeIinc(bcs.method(), bcs.bci());
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66 }
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67
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68 public String toString() {
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69 StringBuffer buf = new StringBuffer();
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70 buf.append("iinc");
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71 buf.append(spaces);
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72 buf.append('#');
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73 buf.append(Integer.toString(getLocalVarIndex()));
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74 buf.append(" by ");
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75 buf.append(Integer.toString(getIncrement()));
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76 return buf.toString();
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77 }
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78 }
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