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