org.apache.commons.nabla.forward.instructions
Class Pop2Transformer

java.lang.Object
  org.apache.commons.nabla.forward.instructions.Pop2Transformer

All Implemented Interfaces:

InstructionsTransformer

public class Pop2Transformer
extends Object
implements InstructionsTransformer

Differentiation transformer for POP2 instructions.

POP2 instructions are replaced by a POP instruction 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

Pop2Transformer()
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

Pop2Transformer

public Pop2Transformer()

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