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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  }