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.instructions;
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.tree.AbstractInsnNode;
24 import org.objectweb.asm.tree.InsnList;
25 import org.objectweb.asm.tree.VarInsnNode;
26
27 /** Differentiation transformer for DLOAD instructions.
28 * <p>Each DLOAD instruction for double variable <i>k</i>
29 * is replaced by one DLOAD instruction for {@link
30 * org.apache.commons.math3.analysis.differentiation.DerivativeStructure}
31 * variable <i>k</i>.
32 * @version $Id$
33 */
34 public class DLoadTransformer implements InstructionsTransformer {
35
36 /** Simple constructor.
37 */
38 public DLoadTransformer() {
39 }
40
41 /** {@inheritDoc} */
42 public InsnList getReplacement(final AbstractInsnNode insn,
43 final MethodDifferentiator methodDifferentiator)
44 throws DifferentiationException {
45 final int var = ((VarInsnNode) insn).var;
46 final InsnList list = new InsnList();
47 list.add(new VarInsnNode(Opcodes.ALOAD, var));
48 return list;
49 }
50
51 }