| /* |
| * 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; |
| import com.sun.org.apache.bcel.internal.Constants; |
| import com.sun.org.apache.bcel.internal.classfile.*; |
| |
| /** |
| * Abstract super class for instructions that use an index into the |
| * constant pool such as LDC, INVOKEVIRTUAL, etc. |
| * |
| * @see ConstantPoolGen |
| * @see LDC |
| * @see INVOKEVIRTUAL |
| * |
| * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> |
| */ |
| public abstract class CPInstruction extends Instruction |
| implements TypedInstruction, IndexedInstruction |
| { |
| protected int index; // index to constant pool |
| |
| /** |
| * Empty constructor needed for the Class.newInstance() statement in |
| * Instruction.readInstruction(). Not to be used otherwise. |
| */ |
| CPInstruction() {} |
| |
| /** |
| * @param index to constant pool |
| */ |
| protected CPInstruction(short opcode, int index) { |
| super(opcode, (short)3); |
| setIndex(index); |
| } |
| |
| /** |
| * Dump instruction as byte code to stream out. |
| * @param out Output stream |
| */ |
| public void dump(DataOutputStream out) throws IOException { |
| out.writeByte(opcode); |
| out.writeShort(index); |
| } |
| |
| /** |
| * Long output format: |
| * |
| * <name of opcode> "["<opcode number>"]" |
| * "("<length of instruction>")" "<"< constant pool index>">" |
| * |
| * @param verbose long/short format switch |
| * @return mnemonic for instruction |
| */ |
| public String toString(boolean verbose) { |
| return super.toString(verbose) + " " + index; |
| } |
| |
| /** |
| * @return mnemonic for instruction with symbolic references resolved |
| */ |
| public String toString(ConstantPool cp) { |
| Constant c = cp.getConstant(index); |
| String str = cp.constantToString(c); |
| |
| if(c instanceof ConstantClass) |
| str = str.replace('.', '/'); |
| |
| return com.sun.org.apache.bcel.internal.Constants.OPCODE_NAMES[opcode] + " " + str; |
| } |
| |
| /** |
| * Read needed data (i.e., index) from file. |
| * @param bytes input stream |
| * @param wide wide prefix? |
| */ |
| protected void initFromFile(ByteSequence bytes, boolean wide) |
| throws IOException |
| { |
| setIndex(bytes.readUnsignedShort()); |
| length = 3; |
| } |
| |
| /** |
| * @return index in constant pool referred by this instruction. |
| */ |
| public final int getIndex() { return index; } |
| |
| /** |
| * Set the index to constant pool. |
| * @param index in constant pool. |
| */ |
| public void setIndex(int index) { |
| if(index < 0) |
| throw new ClassGenException("Negative index value: " + index); |
| |
| this.index = index; |
| } |
| |
| /** @return type related with this instruction. |
| */ |
| public Type getType(ConstantPoolGen cpg) { |
| ConstantPool cp = cpg.getConstantPool(); |
| String name = cp.getConstantString(index, com.sun.org.apache.bcel.internal.Constants.CONSTANT_Class); |
| |
| if(!name.startsWith("[")) |
| name = "L" + name + ";"; |
| |
| return Type.getType(name); |
| } |
| } |