001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.nabla.forward.arithmetic;
018    
019    import org.apache.commons.nabla.DifferentiationException;
020    import org.apache.commons.nabla.forward.analysis.InstructionsTransformer;
021    import org.apache.commons.nabla.forward.analysis.MethodDifferentiator;
022    import org.objectweb.asm.Opcodes;
023    import org.objectweb.asm.Type;
024    import org.objectweb.asm.tree.AbstractInsnNode;
025    import org.objectweb.asm.tree.InsnList;
026    import org.objectweb.asm.tree.InsnNode;
027    import org.objectweb.asm.tree.MethodInsnNode;
028    
029    /** Differentiation transformer for DNEG instructions.
030     * @version $Id$
031     */
032    public class DNegTransformer implements InstructionsTransformer {
033    
034        /** Simple constructor.
035         */
036        public DNegTransformer() {
037        }
038    
039        /** {@inheritDoc} */
040        public InsnList getReplacement(final AbstractInsnNode insn,
041                                       final MethodDifferentiator methodDifferentiator)
042            throws DifferentiationException {
043    
044            final InsnList list = new InsnList();
045            list.add(new InsnNode(Opcodes.DUP));
046            list.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, DS_TYPE.getInternalName(),
047                                        "negate",
048                                        Type.getMethodDescriptor(DS_TYPE)));
049            return list;
050    
051        }
052    
053    }