1. package com.sun.org.apache.bcel.internal.generic;

  2. 

  3. /* ====================================================================

  4.  * The Apache Software License, Version 1.1

  5.  *

  6.  * Copyright (c) 2001 The Apache Software Foundation.  All rights

  7.  * reserved.

  8.  *

  9.  * Redistribution and use in source and binary forms, with or without

  10.  * modification, are permitted provided that the following conditions

  11.  * are met:

  12.  *

  13.  * 1. Redistributions of source code must retain the above copyright

  14.  *    notice, this list of conditions and the following disclaimer.

  15.  *

  16.  * 2. Redistributions in binary form must reproduce the above copyright

  17.  *    notice, this list of conditions and the following disclaimer in

  18.  *    the documentation and/or other materials provided with the

  19.  *    distribution.

  20.  *

  21.  * 3. The end-user documentation included with the redistribution,

  22.  *    if any, must include the following acknowledgment:

  23.  *       "This product includes software developed by the

  24.  *        Apache Software Foundation (http://www.apache.org/)."

  25.  *    Alternately, this acknowledgment may appear in the software itself,

  26.  *    if and wherever such third-party acknowledgments normally appear.

  27.  *

  28.  * 4. The names "Apache" and "Apache Software Foundation" and

  29.  *    "Apache BCEL" must not be used to endorse or promote products

  30.  *    derived from this software without prior written permission. For

  31.  *    written permission, please contact apache@apache.org.

  32.  *

  33.  * 5. Products derived from this software may not be called "Apache",

  34.  *    "Apache BCEL", nor may "Apache" appear in their name, without

  35.  *    prior written permission of the Apache Software Foundation.

  36.  *

  37.  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED

  38.  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

  39.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

  40.  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR

  41.  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

  42.  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

  43.  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

  44.  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

  45.  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

  46.  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT

  47.  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

  48.  * SUCH DAMAGE.

  49.  * ====================================================================

  50.  *

  51.  * This software consists of voluntary contributions made by many

  52.  * individuals on behalf of the Apache Software Foundation.  For more

  53.  * information on the Apache Software Foundation, please see

  54.  * <http://www.apache.org/>.

  55.  */

  56. import com.sun.org.apache.bcel.internal.Constants;

  57. import java.io.*;

  58. 

  59. /** 

  60.  * Wrapper class for push operations, which are implemented either as BIPUSH,

  61.  * LDC or xCONST_n instructions.

  62.  *

  63.  * @version $Id: PUSH.java,v 1.1.1.1 2001/10/29 20:00:25 jvanzyl Exp $

  64.  * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>

  65.  */

  66. public final class PUSH

  67.   implements CompoundInstruction, VariableLengthInstruction, InstructionConstants

  68. {

  69.   private Instruction instruction;

  70. 

  71.   /**

  72.    * This constructor also applies for values of type short, char, byte 

  73.    *

  74.    * @param cp Constant pool

  75.    * @param value to be pushed 

  76.    */

  77.   public PUSH(ConstantPoolGen cp, int value) {

  78.     if((value >= -1) && (value <= 5)) // Use ICONST_n

  79.       instruction = INSTRUCTIONS[Constants.ICONST_0 + value];

  80.     else if((value >= -128) && (value <= 127)) // Use BIPUSH

  81.       instruction = new BIPUSH((byte)value);

  82.     else if((value >= -32768) && (value <= 32767)) // Use SIPUSH

  83.       instruction = new SIPUSH((short)value);

  84.     else // If everything fails create a Constant pool entry

  85.       instruction = new LDC(cp.addInteger(value));

  86.   }

  87. 

  88.   /**

  89.    * @param cp Constant pool

  90.    * @param value to be pushed 

  91.    */

  92.   public PUSH(ConstantPoolGen cp, boolean value) {

  93.     instruction = INSTRUCTIONS[Constants.ICONST_0 + (value? 1 : 0)];

  94.   }

  95. 

  96.   /**

  97.    * @param cp Constant pool

  98.    * @param value to be pushed 

  99.    */

  100.   public PUSH(ConstantPoolGen cp, float value) {

  101.     if(value == 0.0)

  102.       instruction = FCONST_0;

  103.     else if(value == 1.0)

  104.       instruction = FCONST_1;

  105.     else if(value == 2.0)

  106.       instruction = FCONST_2;

  107.     else // Create a Constant pool entry

  108.       instruction = new LDC(cp.addFloat(value));

  109.   }

  110. 

  111.   /**

  112.    * @param cp Constant pool

  113.    * @param value to be pushed 

  114.    */

  115.   public PUSH(ConstantPoolGen cp, long value) {

  116.     if(value == 0)

  117.       instruction = LCONST_0;

  118.     else if(value == 1)

  119.       instruction = LCONST_1;

  120.     else // Create a Constant pool entry

  121.       instruction = new LDC2_W(cp.addLong(value));

  122.   }

  123. 

  124.   /**

  125.    * @param cp Constant pool

  126.    * @param value to be pushed 

  127.    */

  128.   public PUSH(ConstantPoolGen cp, double value) {

  129.     if(value == 0.0)

  130.       instruction = DCONST_0;

  131.     else if(value == 1.0)

  132.       instruction = DCONST_1;

  133.     else // Create a Constant pool entry

  134.       instruction = new LDC2_W(cp.addDouble(value));

  135.   }

  136. 

  137.   /**

  138.    * @param cp Constant pool

  139.    * @param value to be pushed 

  140.    */

  141.   public PUSH(ConstantPoolGen cp, String value) {

  142.     if(value == null)

  143.       instruction = ACONST_NULL;

  144.     else // Create a Constant pool entry

  145.       instruction = new LDC(cp.addString(value));

  146.   }

  147. 

  148.   /**

  149.    * @param cp Constant pool

  150.    * @param value to be pushed 

  151.    */

  152.   public PUSH(ConstantPoolGen cp, Number value) {

  153.     if((value instanceof Integer) || (value instanceof Short) || (value instanceof Byte))

  154.       instruction = new PUSH(cp, value.intValue()).instruction;

  155.     else if(value instanceof Double)

  156.       instruction = new PUSH(cp, value.doubleValue()).instruction;

  157.     else if(value instanceof Float)

  158.       instruction = new PUSH(cp, value.floatValue()).instruction;

  159.     else if(value instanceof Long)

  160.       instruction = new PUSH(cp, value.longValue()).instruction;

  161.     else

  162.       throw new ClassGenException("What's this: " + value);

  163.   }

  164. 

  165.   /**

  166.    * @param cp Constant pool

  167.    * @param value to be pushed 

  168.    */

  169.   public PUSH(ConstantPoolGen cp, Character value) {

  170.     this(cp, (int)value.charValue());

  171.   }

  172. 

  173.   /**

  174.    * @param cp Constant pool

  175.    * @param value to be pushed 

  176.    */

  177.   public PUSH(ConstantPoolGen cp, Boolean value) {

  178.     this(cp, value.booleanValue());

  179.   }

  180. 

  181.   public final InstructionList getInstructionList() {

  182.     return new InstructionList(instruction);

  183.   }

  184. 

  185.   public final Instruction getInstruction() {

  186.     return instruction;

  187.   }

  188. 

  189.   /**

  190.    * @return mnemonic for instruction

  191.    */

  192.   public String toString() {

  193.     return instruction.toString() + " (PUSH)";

  194.   }

  195. }

  196.