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1   /*
2    * Copyright (c) 2001, 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  
25  package sun.jvm.hotspot.runtime;
26  
27  import java.util.*;
28  
29  import sun.jvm.hotspot.debugger.*;
30  
31  public class StackValueCollection {
32    private List list;
33  
34    public StackValueCollection()           { list = new ArrayList(); }
35    public StackValueCollection(int length) { list = new ArrayList(length); }
36  
37    public void add(StackValue val) { list.add(val); }
38    public int  size()              { return list.size(); }
39    public boolean isEmpty()        { return (size() == 0); }
40    public StackValue get(int i)    { return (StackValue) list.get(i); }
41  
42    // Get typed locals/expressions
43    // FIXME: must figure out whether word swapping is necessary on x86
44    public boolean   booleanAt(int slot)   { return (int)get(slot).getInteger() != 0; }
45    public byte      byteAt(int slot)      { return (byte) get(slot).getInteger(); }
46    public char      charAt(int slot)      { return (char) get(slot).getInteger(); }
47    public short     shortAt(int slot)     { return (short) get(slot).getInteger(); }
48    public int       intAt(int slot)       { return (int) get(slot).getInteger(); }
49    public long      longAt(int slot)      { return VM.getVM().buildLongFromIntsPD((int) get(slot).getInteger(),
50                                                                                   (int) get(slot+1).getInteger()); }
51    public OopHandle oopHandleAt(int slot) { return get(slot).getObject(); }
52    public float     floatAt(int slot)     { return Float.intBitsToFloat(intAt(slot)); }
53    public double    doubleAt(int slot)    { return Double.longBitsToDouble(longAt(slot)); }
54  }