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
25package sun.jvm.hotspot.interpreter;
26
27import sun.jvm.hotspot.oops.*;
28import sun.jvm.hotspot.utilities.*;
29
30public class BytecodeIinc extends BytecodeWideable {
31  BytecodeIinc(Method method, int bci) {
32    super(method, bci);
33  }
34
35  public int getIncrement() {
36    // increment is signed
37    return (isWide()) ? (int) javaShortAt(3) : (int) javaByteAt(2);
38  }
39
40  public void verify() {
41    if (Assert.ASSERTS_ENABLED) {
42      Assert.that(isValid(), "check iinc");
43    }
44  }
45
46  public boolean isValid() {
47    return javaCode() == Bytecodes._iinc;
48  }
49
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  */
59  public static BytecodeIinc atCheck(Method method, int bci) {
60    BytecodeIinc b = new BytecodeIinc(method, bci);
61    return (b.isValid() ? b : null);
62  }
63
64  public static BytecodeIinc at(BytecodeStream bcs) {
65    return new BytecodeIinc(bcs.method(), bcs.bci());
66  }
67
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