| /* |
| * 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 java.io.*; |
| import com.sun.org.apache.bcel.internal.util.ByteSequence; |
| |
| /** |
| * LDC - Push item from constant pool. |
| * |
| * <PRE>Stack: ... -> ..., item</PRE> |
| * |
| * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> |
| */ |
| public class LDC extends CPInstruction |
| implements PushInstruction, ExceptionThrower, TypedInstruction { |
| /** |
| * Empty constructor needed for the Class.newInstance() statement in |
| * Instruction.readInstruction(). Not to be used otherwise. |
| */ |
| LDC() {} |
| |
| public LDC(int index) { |
| super(com.sun.org.apache.bcel.internal.Constants.LDC_W, index); |
| setSize(); |
| } |
| |
| // Adjust to proper size |
| protected final void setSize() { |
| if(index <= com.sun.org.apache.bcel.internal.Constants.MAX_BYTE) { // Fits in one byte? |
| opcode = com.sun.org.apache.bcel.internal.Constants.LDC; |
| length = 2; |
| } else { |
| opcode = com.sun.org.apache.bcel.internal.Constants.LDC_W; |
| length = 3; |
| } |
| } |
| |
| /** |
| * Dump instruction as byte code to stream out. |
| * @param out Output stream |
| */ |
| public void dump(DataOutputStream out) throws IOException { |
| out.writeByte(opcode); |
| |
| if(length == 2) |
| out.writeByte(index); |
| else // Applies for LDC_W |
| out.writeShort(index); |
| } |
| |
| /** |
| * Set the index to constant pool and adjust size. |
| */ |
| public final void setIndex(int index) { |
| super.setIndex(index); |
| setSize(); |
| } |
| |
| /** |
| * Read needed data (e.g. index) from file. |
| */ |
| protected void initFromFile(ByteSequence bytes, boolean wide) |
| throws IOException |
| { |
| length = 2; |
| index = bytes.readUnsignedByte(); |
| } |
| |
| public Object getValue(ConstantPoolGen cpg) { |
| com.sun.org.apache.bcel.internal.classfile.Constant c = cpg.getConstantPool().getConstant(index); |
| |
| switch(c.getTag()) { |
| case com.sun.org.apache.bcel.internal.Constants.CONSTANT_String: |
| int i = ((com.sun.org.apache.bcel.internal.classfile.ConstantString)c).getStringIndex(); |
| c = cpg.getConstantPool().getConstant(i); |
| return ((com.sun.org.apache.bcel.internal.classfile.ConstantUtf8)c).getBytes(); |
| |
| case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Float: |
| return new Float(((com.sun.org.apache.bcel.internal.classfile.ConstantFloat)c).getBytes()); |
| |
| case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Integer: |
| return new Integer(((com.sun.org.apache.bcel.internal.classfile.ConstantInteger)c).getBytes()); |
| |
| default: // Never reached |
| throw new RuntimeException("Unknown or invalid constant type at " + index); |
| } |
| } |
| |
| public Type getType(ConstantPoolGen cpg) { |
| switch(cpg.getConstantPool().getConstant(index).getTag()) { |
| case com.sun.org.apache.bcel.internal.Constants.CONSTANT_String: return Type.STRING; |
| case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Float: return Type.FLOAT; |
| case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Integer: return Type.INT; |
| default: // Never reached |
| throw new RuntimeException("Unknown or invalid constant type at " + index); |
| } |
| } |
| |
| public Class[] getExceptions() { |
| return com.sun.org.apache.bcel.internal.ExceptionConstants.EXCS_STRING_RESOLUTION; |
| } |
| |
| /** |
| * Call corresponding visitor method(s). The order is: |
| * Call visitor methods of implemented interfaces first, then |
| * call methods according to the class hierarchy in descending order, |
| * i.e., the most specific visitXXX() call comes last. |
| * |
| * @param v Visitor object |
| */ |
| public void accept(Visitor v) { |
| v.visitStackProducer(this); |
| v.visitPushInstruction(this); |
| v.visitExceptionThrower(this); |
| v.visitTypedInstruction(this); |
| v.visitCPInstruction(this); |
| v.visitLDC(this); |
| } |
| } |