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      1 /*
      2  * Copyright 2015, Google Inc.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 package org.jf.smalidea.util;
     33 
     34 import org.jetbrains.annotations.NotNull;
     35 import org.jetbrains.annotations.Nullable;
     36 import org.jf.dexlib2.Opcode;
     37 import org.jf.smalidea.psi.impl.SmaliInstruction;
     38 import org.jf.smalidea.psi.impl.SmaliLabel;
     39 import org.jf.smalidea.psi.impl.SmaliLabelReference;
     40 import org.jf.smalidea.psi.impl.SmaliMethod;
     41 
     42 public class InstructionUtils {
     43 
     44     @Nullable
     45     public static SmaliInstruction findFirstInstructionWithTarget(
     46             @NotNull SmaliMethod method, @NotNull Opcode opcode, int targetOffset) {
     47         for (SmaliInstruction instruction: method.getInstructions()) {
     48             if (instruction.getOpcode() == opcode) {
     49                 SmaliLabelReference labelReference = instruction.getTarget();
     50                 if (labelReference == null) {
     51                     continue;
     52                 }
     53 
     54                 SmaliLabel label = labelReference.resolve();
     55                 if (label == null) {
     56                     continue;
     57                 }
     58 
     59                 if (label.getOffset() == targetOffset) {
     60                     return instruction;
     61                 }
     62             }
     63         }
     64         return null;
     65     }
     66 }
     67