jef.dna.instructions.impl
Class Dup_X1

java.lang.Object
  jef.dna.instructions.impl.InstructionAncestor
      jef.dna.instructions.impl.Dup_X1

All Implemented Interfaces:

java.lang.Cloneable, Instruction, BytesCountable

public class Dup_X1
extends InstructionAncestor

This class maps the DUP_X1 bytecode instruction which duplicates the top value on the operand stack and insert the duplicated value two values down in the operand stack. The dup_x1 instruction must not be used unless both value1 and value2 are values of a category 1 computational type.

Author:

ggiovanzana

Field Summary

Fields inherited from class jef.dna.instructions.impl.InstructionAncestor

logger, opCode, operands, operandsCount

Constructor Summary

Dup_X1()
Creates a new instance of Dup_X1

Method Summary

int	updateRefs(int offset) This method must implement the logic necessary to update all the references to constant pool table's entries contained within the bytecode instruction.

Methods inherited from class jef.dna.instructions.impl.InstructionAncestor

clone, fromArray, getBytesCount, getOpCode, getOperands, getOperandsCount, setOpCode, setOperands, setOperandsCountPosticipated, toArray

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Dup_X1

public Dup_X1()

Creates a new instance of Dup_X1

Method Detail

updateRefs

public int updateRefs(int offset)

This method must implement the logic necessary to update all the references to constant pool table's entries contained within the bytecode instruction.

Specified by:

updateRefs in interface Instruction

Overrides:

updateRefs in class InstructionAncestor

Parameters:

offset - The offset used for updating expressed as number of cpt's entries to be skipped

Returns:

int The number of processed words within the current bytecode instruction