1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package dexfuzz.program.mutators;
18
19import dexfuzz.Log;
20import dexfuzz.MutationStats;
21import dexfuzz.program.MInsn;
22import dexfuzz.program.Mutation;
23import dexfuzz.rawdex.Opcode;
24import java.util.List;
25import java.util.Random;
26
27public class OppositeBranchChanger extends IfBranchChanger {
28
29  public OppositeBranchChanger(Random rng, MutationStats stats, List<Mutation> mutations) {
30    super(rng, stats, mutations);
31    likelihood = 40;
32  }
33
34  @Override
35  protected Opcode getModifiedOpcode(MInsn mInsn) {
36    Opcode opcode = mInsn.insn.info.opcode;
37    switch (opcode) {
38      case IF_EQ:
39        return Opcode.IF_NE;
40      case IF_NE:
41        return Opcode.IF_EQ;
42      case IF_LT:
43        return Opcode.IF_GE;
44      case IF_GT:
45        return Opcode.IF_LE;
46      case IF_GE:
47        return Opcode.IF_LT;
48      case IF_LE:
49        return Opcode.IF_GT;
50      case IF_EQZ:
51        return Opcode.IF_NEZ;
52      case IF_NEZ:
53        return Opcode.IF_EQZ;
54      case IF_LTZ:
55        return Opcode.IF_GEZ;
56      case IF_GTZ:
57        return Opcode.IF_LEZ;
58      case IF_GEZ:
59        return Opcode.IF_LTZ;
60      case IF_LEZ:
61        return Opcode.IF_GTZ;
62      default:
63        Log.errorAndQuit("Could not find if branch.");
64        return opcode;
65    }
66  }
67
68  @Override
69  protected String getMutationTag() {
70    return "opposite";
71  }
72}