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

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

All Implemented Interfaces:

InstructionsTransformer

public class DReturnTransformer
extends Object
implements InstructionsTransformer

Differentiation transformer for DRETURN instructions.

DRETURN instructions are replaced by ARETURN 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

DReturnTransformer(boolean stack0Converted)
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

DReturnTransformer

public DReturnTransformer(boolean stack0Converted)

Simple constructor.

Parameters:

stack0Converted - if true, the top level stack element has already been converted

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