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      1 /*
      2  * Copyright 2014, 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.dexlib.instruction;
     33 
     34 import com.google.common.collect.Lists;
     35 import org.jf.dexlib2.Opcode;
     36 import org.jf.dexlib2.iface.instruction.SwitchElement;
     37 import org.jf.dexlib2.iface.instruction.formats.PackedSwitchPayload;
     38 import org.jf.smalidea.psi.impl.*;
     39 import org.jf.smalidea.util.InstructionUtils;
     40 
     41 import javax.annotation.Nonnull;
     42 import java.util.List;
     43 
     44 public class SmalideaPackedSwitchPayload extends SmalideaInstruction implements PackedSwitchPayload {
     45     public SmalideaPackedSwitchPayload(@Nonnull SmaliInstruction instruction) {
     46         super(instruction);
     47     }
     48 
     49     @Nonnull @Override public List<? extends SwitchElement> getSwitchElements() {
     50         final SmaliLiteral startKey = psiInstruction.getPackedSwitchStartKey();
     51         assert startKey != null;
     52         List<SmaliPackedSwitchElement> elements = psiInstruction.getPackedSwitchElements();
     53 
     54         SmaliMethod smaliMethod = psiInstruction.getParentMethod();
     55         SmaliInstruction packedSwitchInstruction = InstructionUtils.findFirstInstructionWithTarget(
     56                 smaliMethod, Opcode.PACKED_SWITCH, psiInstruction.getOffset());
     57         final int baseOffset;
     58 
     59         if (packedSwitchInstruction == null) {
     60             baseOffset = 0;
     61         } else {
     62             baseOffset = packedSwitchInstruction.getOffset();
     63         }
     64 
     65         List<SwitchElement> newElements = Lists.newArrayList();
     66         // TODO: check for integer wraparound (how does art/dalvik handle that?)
     67         int initialKey = (int)startKey.getIntegralValue();
     68         for (int i=0; i<elements.size(); i++) {
     69             final SmaliPackedSwitchElement element = elements.get(i);
     70 
     71             final int key = initialKey + i;
     72 
     73             newElements.add(new SwitchElement() {
     74                 @Override public int getKey() {
     75                     return key;
     76                 }
     77 
     78                 @Override public int getOffset() {
     79                     SmaliLabelReference labelReference = element.getTarget();
     80                     if (labelReference == null) {
     81                         return 0;
     82                     }
     83 
     84                     SmaliLabel label = labelReference.resolve();
     85                     if (label == null) {
     86                         return 0;
     87                     }
     88 
     89                     return label.getOffset() - baseOffset;
     90                 }
     91             });
     92         }
     93 
     94         return newElements;
     95     }
     96 
     97     @Override public int getCodeUnits() {
     98         return psiInstruction.getInstructionSize()/2;
     99     }
    100 }
    101