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      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 
     17 package dexfuzz.program.mutators;
     18 
     19 import dexfuzz.Log;
     20 import dexfuzz.MutationStats;
     21 import dexfuzz.program.MInsn;
     22 import dexfuzz.program.Mutation;
     23 import dexfuzz.rawdex.Opcode;
     24 import java.util.List;
     25 import java.util.Random;
     26 
     27 public 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 }