jef.dna.instructions.impl
Class IfNoNull

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

All Implemented Interfaces:

java.lang.Cloneable, Instruction, BytesCountable

public class IfNoNull
extends InstructionAncestor

This class maps the IFNONNULL bytecode instruction which branches to the specified offset if and only if the value of type reference popped from the operand stack is not null. The offset to which to jump to is determined starting from the two bytes specified as operands.

Author:

Francesco Russo (frusso@cs.unibo.it)

Field Summary

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

logger, opCode, operands, operandsCount

Constructor Summary

IfNoNull()
Creates a new instance of IfNoNull

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

IfNoNull

public IfNoNull()

Creates a new instance of IfNoNull

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