org.apache.commons.nabla.forward.instructions
Class Dup2X1Transformer

java.lang.Object
  org.apache.commons.nabla.forward.instructions.Dup2X1Transformer

All Implemented Interfaces:

InstructionsTransformer

public class Dup2X1Transformer
extends Object
implements InstructionsTransformer

Differentiation transformer for DUP2_X1 instructions.

DUP2_X1 instructions are replaced by DUP_X1 instructions as a reference to a DerivativeStructure instance uses only one stack slot instead of two.

Version:

$Id$

Field Summary

Fields inherited from interface org.apache.commons.nabla.forward.analysis.InstructionsTransformer

DS_TYPE

Constructor Summary

Dup2X1Transformer()
Simple constructor.

Method Summary

org.objectweb.asm.tree.InsnList

getReplacement(org.objectweb.asm.tree.AbstractInsnNode insn, MethodDifferentiator methodDifferentiator) Get the replacement instructions.

Methods inherited from class java.lang.Object

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

Constructor Detail

Dup2X1Transformer

public Dup2X1Transformer()

Simple constructor.

Method Detail

getReplacement

public org.objectweb.asm.tree.InsnList getReplacement(org.objectweb.asm.tree.AbstractInsnNode insn,
                                                      MethodDifferentiator methodDifferentiator)
                                               throws DifferentiationException

Get the replacement instructions.

Specified by:

getReplacement in interface InstructionsTransformer

Parameters:

insn - original instruction

methodDifferentiator - method differentiator driving this transformer

Returns:

replacement instructions

Throws:

DifferentiationException - if the method differentiator cannot provide a temporary variable