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 * (the "License"); you may not use this file except in compliance with
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package com.sun.org.apache.bcel.internal.generic;

import java.io.DataOutputStream;
import java.io.IOException;

import com.sun.org.apache.bcel.internal.util.ByteSequence;

IINC - Increment local variable by constant
Version:$Id: IINC.java 1747278 2016-06-07 17:28:43Z britter $
/** * IINC - Increment local variable by constant * * @version $Id: IINC.java 1747278 2016-06-07 17:28:43Z britter $ */
public class IINC extends LocalVariableInstruction { private boolean wide; private int c;
Empty constructor needed for the Class.newInstance() statement in Instruction.readInstruction(). Not to be used otherwise.
/** * Empty constructor needed for the Class.newInstance() statement in * Instruction.readInstruction(). Not to be used otherwise. */
IINC() { }
Params:
  • n – index of local variable
  • c – increment factor
/** * @param n index of local variable * @param c increment factor */
public IINC(final int n, final int c) { super(); // Default behaviour of LocalVariableInstruction causes error super.setOpcode(com.sun.org.apache.bcel.internal.Const.IINC); super.setLength((short) 3); setIndex(n); // May set wide as side effect setIncrement(c); }
Dump instruction as byte code to stream out.
Params:
  • out – Output stream
/** * Dump instruction as byte code to stream out. * @param out Output stream */
@Override public void dump( final DataOutputStream out ) throws IOException { if (wide) { out.writeByte(com.sun.org.apache.bcel.internal.Const.WIDE); } out.writeByte(super.getOpcode()); if (wide) { out.writeShort(super.getIndex()); out.writeShort(c); } else { out.writeByte(super.getIndex()); out.writeByte(c); } } private void setWide() { wide = (super.getIndex() > com.sun.org.apache.bcel.internal.Const.MAX_BYTE) || (Math.abs(c) > Byte.MAX_VALUE); if (wide) { super.setLength(6); // wide byte included } else { super.setLength(3); } }
Read needed data (e.g. index) from file.
/** * Read needed data (e.g. index) from file. */
@Override protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException { this.wide = wide; if (wide) { super.setLength(6); super.setIndexOnly(bytes.readUnsignedShort()); c = bytes.readShort(); } else { super.setLength(3); super.setIndexOnly(bytes.readUnsignedByte()); c = bytes.readByte(); } }
Returns:mnemonic for instruction
/** * @return mnemonic for instruction */
@Override public String toString( final boolean verbose ) { return super.toString(verbose) + " " + c; }
Set index of local variable.
/** * Set index of local variable. */
@Override public final void setIndex( final int n ) { if (n < 0) { throw new ClassGenException("Negative index value: " + n); } super.setIndexOnly(n); setWide(); }
Returns:increment factor
/** * @return increment factor */
public final int getIncrement() { return c; }
Set increment factor.
/** * Set increment factor. */
public final void setIncrement( final int c ) { this.c = c; setWide(); }
Returns:int type
/** @return int type */
@Override public Type getType( final ConstantPoolGen cp ) { return Type.INT; }
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.
Params:
  • v – Visitor object
/** * 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 */
@Override public void accept( final Visitor v ) { v.visitLocalVariableInstruction(this); v.visitIINC(this); } }