001    /* MBEL: The Microsoft Bytecode Engineering Library
002     * Copyright (C) 2003 The University of Arizona
003     * http://www.cs.arizona.edu/mbel/license.html
004     *
005     * This library is free software; you can redistribute it and/or
006     * modify it under the terms of the GNU Lesser General Public
007     * License as published by the Free Software Foundation; either
008     * version 2.1 of the License, or (at your option) any later version.
009     * 
010     * This library is distributed in the hope that it will be useful,
011     * but WITHOUT ANY WARRANTY; without even the implied warranty of
012     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013     * Lesser General Public License for more details.
014     * 
015     * You should have received a copy of the GNU Lesser General Public
016     * License along with this library; if not, write to the Free Software
017     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018     */
019    
020    package edu.arizona.cs.mbel.instructions;
021    
022    /** Make new array.<br>
023      * Stack transition:<br>
024      *   ..., numElems --> ..., array
025      * @author Michael Stepp
026      */
027    public class NEWARR extends Instruction{
028       public static final int NEWARR = 0x8D;
029       protected static final int OPCODE_LIST[] = {NEWARR};
030       private edu.arizona.cs.mbel.mbel.AbstractTypeReference classRef; // element type
031    
032       /** Makes a NEWARR object with the given element type.
033         * @param ref the element type of the array
034         */
035       public NEWARR(edu.arizona.cs.mbel.mbel.AbstractTypeReference ref) throws InstructionInitException{
036          super(NEWARR, OPCODE_LIST);
037          classRef = ref;
038       }
039    
040       /** Returns the element type for this new array.
041         */
042       public edu.arizona.cs.mbel.mbel.AbstractTypeReference getType(){
043          return classRef;
044       }
045    
046       public String getName(){
047          return "newarr";
048       }
049    
050       public int getLength(){
051          return (super.getLength()+4);
052       }
053    
054       protected void emit(edu.arizona.cs.mbel.ByteBuffer buffer, edu.arizona.cs.mbel.emit.ClassEmitter emitter){
055          super.emit(buffer, emitter);
056          long token = emitter.getTypeToken(classRef);
057          buffer.putTOKEN(token);
058       }
059    
060       public NEWARR(int opcode, edu.arizona.cs.mbel.mbel.ClassParser parse) throws java.io.IOException, InstructionInitException{
061          super(opcode, OPCODE_LIST);
062          long classToken = parse.getMSILInputStream().readTOKEN();
063          classRef = parse.getClassRef(classToken);
064       }
065       
066       public boolean equals(Object o){
067          if (!(super.equals(o) && (o instanceof NEWARR)))
068             return false;
069          NEWARR newarr = (NEWARR)o;
070          return (classRef==newarr.classRef);
071       }
072    
073    /*
074       public void output(){
075          System.out.print(getName()+" ");
076          classRef.output();
077       }
078    */
079    }