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 import sun.jvm.hotspot.types.*;
  31 
  32 public class StackValueCollection {
  33   private List list;
  34 
  35   public StackValueCollection()           { list = new ArrayList(); }
  36   public StackValueCollection(int length) { list = new ArrayList(length); }
  37 
  38   public void add(StackValue val) { list.add(val); }
  39   public int  size()              { return list.size(); }
  40   public boolean isEmpty()        { return (size() == 0); }
  41   public StackValue get(int i)    { return (StackValue) list.get(i); }
  42 
  43   // Get typed locals/expressions
  44   // FIXME: must figure out whether word swapping is necessary on x86
  45   public boolean   booleanAt(int slot)   { return (int)get(slot).getInteger() != 0; }
  46   public byte      byteAt(int slot)      { return (byte) get(slot).getInteger(); }
  47   public char      charAt(int slot)      { return (char) get(slot).getInteger(); }
  48   public short     shortAt(int slot)     { return (short) get(slot).getInteger(); }
  49   public int       intAt(int slot)       { return (int) get(slot).getInteger(); }
  50   public long      longAt(int slot)      { return VM.getVM().buildLongFromIntsPD((int) get(slot).getInteger(),
  51                                                                                  (int) get(slot+1).getInteger()); }
  52 
  53   public OopHandle oopHandleAt(int slot) {
  54     StackValue sv = get(slot);
  55     if (sv.getType() == BasicType.getTConflict()) {
  56       throw new WrongTypeException("Conflict type");
  57     }
  58     return sv.getObject();
  59   }
  60 
  61   public float     floatAt(int slot)     { return Float.intBitsToFloat(intAt(slot)); }
  62   public double    doubleAt(int slot)    { return Double.longBitsToDouble(longAt(slot)); }
  63 }
--- EOF ---