| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| package com.sun.org.apache.bcel.internal.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 com.sun.org.apache.bcel.internal.Constants; |
| import java.io.*; |
| |
| /** |
| * Wrapper class for push operations, which are implemented either as BIPUSH, |
| * LDC or xCONST_n instructions. |
| * |
| * @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)); |
| } |
| |
| /** |
| * @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)"; |
| } |
| } |