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      1 /*
      2  * Copyright 2013, 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.dexlib2;
     33 
     34 import com.google.common.collect.Maps;
     35 import com.google.common.collect.RangeMap;
     36 
     37 import javax.annotation.Nonnull;
     38 import javax.annotation.Nullable;
     39 import java.util.EnumMap;
     40 import java.util.HashMap;
     41 
     42 public class Opcodes {
     43 
     44     /**
     45      * Either the api level for dalvik opcodes, or the art version for art opcodes
     46      */
     47     public final int api;
     48     public final int artVersion;
     49     @Nonnull private final Opcode[] opcodesByValue = new Opcode[255];
     50     @Nonnull private final EnumMap<Opcode, Short> opcodeValues;
     51     @Nonnull private final HashMap<String, Opcode> opcodesByName;
     52 
     53     @Nonnull
     54     public static Opcodes forApi(int api) {
     55         return new Opcodes(api, VersionMap.mapApiToArtVersion(api), false);
     56     }
     57 
     58     @Nonnull
     59     public static Opcodes forApi(int api, boolean experimental) {
     60         return new Opcodes(api, VersionMap.mapApiToArtVersion(api), experimental);
     61     }
     62 
     63     @Nonnull
     64     public static Opcodes forArtVersion(int artVersion) {
     65         return forArtVersion(artVersion, false);
     66     }
     67 
     68     @Nonnull
     69     public static Opcodes forArtVersion(int artVersion, boolean experimental) {
     70         return new Opcodes(VersionMap.mapArtVersionToApi(artVersion), artVersion, experimental);
     71     }
     72 
     73     @Deprecated
     74     public Opcodes(int api) {
     75         this(api, false);
     76     }
     77 
     78     @Deprecated
     79     public Opcodes(int api, boolean experimental) {
     80         this(api, VersionMap.mapApiToArtVersion(api), experimental);
     81     }
     82 
     83     private Opcodes(int api, int artVersion, boolean experimental) {
     84         this.api = api;
     85         this.artVersion = artVersion;
     86 
     87         opcodeValues = new EnumMap<Opcode, Short>(Opcode.class);
     88         opcodesByName = Maps.newHashMap();
     89 
     90         int version;
     91         if (isArt()) {
     92             version = artVersion;
     93         } else {
     94             version = api;
     95         }
     96 
     97         for (Opcode opcode: Opcode.values()) {
     98             RangeMap<Integer, Short> versionToValueMap;
     99 
    100             if (isArt()) {
    101                 versionToValueMap = opcode.artVersionToValueMap;
    102             } else {
    103                 versionToValueMap = opcode.apiToValueMap;
    104             }
    105 
    106             Short opcodeValue = versionToValueMap.get(version);
    107             if (opcodeValue != null && (!opcode.isExperimental() || experimental)) {
    108                 if (!opcode.format.isPayloadFormat) {
    109                     opcodesByValue[opcodeValue] = opcode;
    110                 }
    111                 opcodeValues.put(opcode, opcodeValue);
    112                 opcodesByName.put(opcode.name.toLowerCase(), opcode);
    113             }
    114         }
    115     }
    116 
    117     @Nullable
    118     public Opcode getOpcodeByName(@Nonnull String opcodeName) {
    119         return opcodesByName.get(opcodeName.toLowerCase());
    120     }
    121 
    122     @Nullable
    123     public Opcode getOpcodeByValue(int opcodeValue) {
    124         switch (opcodeValue) {
    125             case 0x100:
    126                 return Opcode.PACKED_SWITCH_PAYLOAD;
    127             case 0x200:
    128                 return Opcode.SPARSE_SWITCH_PAYLOAD;
    129             case 0x300:
    130                 return Opcode.ARRAY_PAYLOAD;
    131             default:
    132                 if (opcodeValue >= 0 && opcodeValue < opcodesByValue.length) {
    133                     return opcodesByValue[opcodeValue];
    134                 }
    135                 return null;
    136         }
    137     }
    138 
    139     @Nullable
    140     public Short getOpcodeValue(@Nonnull Opcode opcode) {
    141         return opcodeValues.get(opcode);
    142     }
    143 
    144     public boolean isArt() {
    145         return artVersion != VersionMap.NO_VERSION;
    146     }
    147 }
    148