1/*
2 * Copyright (c) 2002, 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 BytecodeStore extends BytecodeLoadStore {
31  BytecodeStore(Method method, int bci) {
32    super(method, bci);
33  }
34
35  public void verify() {
36    if (Assert.ASSERTS_ENABLED) {
37      Assert.that(isValid(), "check store");
38    }
39  }
40
41  public boolean isValid() {
42    int jcode = javaCode();
43    switch (jcode) {
44       case Bytecodes._istore:
45       case Bytecodes._lstore:
46       case Bytecodes._fstore:
47       case Bytecodes._dstore:
48       case Bytecodes._astore:
49          return true;
50       default:
51          return false;
52    }
53  }
54
55  public static BytecodeStore at(Method method, int bci) {
56    BytecodeStore b = new BytecodeStore(method, bci);
57    if (Assert.ASSERTS_ENABLED) {
58      b.verify();
59    }
60    return b;
61  }
62
63  /** Like at, but returns null if the BCI is not at store  */
64  public static BytecodeStore atCheck(Method method, int bci) {
65    BytecodeStore b = new BytecodeStore(method, bci);
66    return (b.isValid() ? b : null);
67  }
68
69  public static BytecodeStore at(BytecodeStream bcs) {
70    return new BytecodeStore(bcs.method(), bcs.bci());
71  }
72}
73