1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.nabla.forward.arithmetic;
18
19 import org.apache.commons.nabla.DifferentiationException;
20 import org.apache.commons.nabla.forward.analysis.InstructionsTransformer;
21 import org.apache.commons.nabla.forward.analysis.MethodDifferentiator;
22 import org.objectweb.asm.Opcodes;
23 import org.objectweb.asm.Type;
24 import org.objectweb.asm.tree.AbstractInsnNode;
25 import org.objectweb.asm.tree.InsnList;
26 import org.objectweb.asm.tree.InsnNode;
27 import org.objectweb.asm.tree.MethodInsnNode;
28
29 /** Differentiation transformer for DNEG instructions.
30 * @version $Id$
31 */
32 public class DNegTransformer implements InstructionsTransformer {
33
34 /** Simple constructor.
35 */
36 public DNegTransformer() {
37 }
38
39 /** {@inheritDoc} */
40 public InsnList getReplacement(final AbstractInsnNode insn,
41 final MethodDifferentiator methodDifferentiator)
42 throws DifferentiationException {
43
44 final InsnList list = new InsnList();
45 list.add(new InsnNode(Opcodes.DUP));
46 list.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, DS_TYPE.getInternalName(),
47 "negate",
48 Type.getMethodDescriptor(DS_TYPE)));
49 return list;
50
51 }
52
53 }