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package org.aspectj.apache.bcel.generic;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import org.aspectj.apache.bcel.Constants;
/**
* Wrapper class for push operations, which are implemented either as BIPUSH,
* LDC or xCONST_n instructions.
*
* @version $Id: PUSH.java,v 1.5 2005/01/31 11:32:21 aclement Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
*/
public final class PUSH
implements CompoundInstruction, VariableLengthInstruction, InstructionConstants
{
private Instruction instruction;
/**
* This constructor also applies for values of type short, char, byte
*
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, int value) {
if((value >= -1) && (value <= 5)) // Use ICONST_n
instruction = INSTRUCTIONS[Constants.ICONST_0 + value];
else if((value >= -128) && (value <= 127)) // Use BIPUSH
instruction = new BIPUSH((byte)value);
else if((value >= -32768) && (value <= 32767)) // Use SIPUSH
instruction = new SIPUSH((short)value);
else // If everything fails create a Constant pool entry
instruction = new LDC(cp.addInteger(value));
}
public PUSH(ConstantPoolGen cp, ObjectType t) {
instruction = new LDC_W(cp.addClass(t));
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, boolean value) {
instruction = INSTRUCTIONS[Constants.ICONST_0 + (value? 1 : 0)];
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, float value) {
if(value == 0.0)
instruction = FCONST_0;
else if(value == 1.0)
instruction = FCONST_1;
else if(value == 2.0)
instruction = FCONST_2;
else // Create a Constant pool entry
instruction = new LDC(cp.addFloat(value));
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, long value) {
if(value == 0)
instruction = LCONST_0;
else if(value == 1)
instruction = LCONST_1;
else // Create a Constant pool entry
instruction = new LDC2_W(cp.addLong(value));
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, double value) {
if(value == 0.0)
instruction = DCONST_0;
else if(value == 1.0)
instruction = DCONST_1;
else // Create a Constant pool entry
instruction = new LDC2_W(cp.addDouble(value));
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, String value) {
if(value == null)
instruction = ACONST_NULL;
else // Create a Constant pool entry
instruction = new LDC(cp.addString(value));
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, Number value) {
if((value instanceof Integer) || (value instanceof Short) || (value instanceof Byte))
instruction = new PUSH(cp, value.intValue()).instruction;
else if(value instanceof Double)
instruction = new PUSH(cp, value.doubleValue()).instruction;
else if(value instanceof Float)
instruction = new PUSH(cp, value.floatValue()).instruction;
else if(value instanceof Long)
instruction = new PUSH(cp, value.longValue()).instruction;
else
throw new ClassGenException("What's this: " + value);
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, Character value) {
this(cp, (int)value.charValue());
}
/**
* @param cp Constant pool
* @param value to be pushed
*/
public PUSH(ConstantPoolGen cp, Boolean value) {
this(cp, value.booleanValue());
}
public final InstructionList getInstructionList() {
return new InstructionList(instruction);
}
public final Instruction getInstruction() {
return instruction;
}
/**
* @return mnemonic for instruction
*/
public String toString() {
return instruction.toString() + " (PUSH)";
}
}
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