1/*
2 * Copyright (c) 2002, 2003, 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 BytecodeRet extends BytecodeWideable {
31  BytecodeRet(Method method, int bci) {
32    super(method, bci);
33  }
34
35  public void verify() {
36    if (Assert.ASSERTS_ENABLED) {
37      Assert.that(isValid(), "check ret");
38    }
39  }
40
41  public boolean isValid() {
42    return javaCode() == Bytecodes._ret;
43  }
44
45  public static BytecodeRet at(Method method, int bci) {
46    BytecodeRet b = new BytecodeRet(method, bci);
47    if (Assert.ASSERTS_ENABLED) {
48      b.verify();
49    }
50    return b;
51  }
52
53  /** Like at, but returns null if the BCI is not at ret  */
54  public static BytecodeRet atCheck(Method method, int bci) {
55    BytecodeRet b = new BytecodeRet(method, bci);
56    return (b.isValid() ? b : null);
57  }
58
59  public static BytecodeRet at(BytecodeStream bcs) {
60    return new BytecodeRet(bcs.method(), bcs.bci());
61  }
62
63  public String toString() {
64    StringBuffer buf = new StringBuffer();
65    buf.append("ret");
66    buf.append(spaces);
67    buf.append('#');
68    buf.append(Integer.toString(getLocalVarIndex()));
69    return buf.toString();
70  }
71}
72