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 import static org.jf.dexlib2.VersionMap.NO_VERSION; 43 import static org.jf.dexlib2.VersionMap.mapApiToArtVersion; 44 import static org.jf.dexlib2.VersionMap.mapArtVersionToApi; 45 46 public class Opcodes { 47 48 /** 49 * Either the api level for dalvik opcodes, or the art version for art opcodes 50 */ 51 public final int api; 52 public final int artVersion; 53 @Nonnull private final Opcode[] opcodesByValue = new Opcode[255]; 54 @Nonnull private final EnumMap<Opcode, Short> opcodeValues; 55 @Nonnull private final HashMap<String, Opcode> opcodesByName; 56 57 @Nonnull forApi(int api)58 public static Opcodes forApi(int api) { 59 return new Opcodes(api, NO_VERSION); 60 } 61 62 @Nonnull forArtVersion(int artVersion)63 public static Opcodes forArtVersion(int artVersion) { 64 return new Opcodes(NO_VERSION, artVersion); 65 } 66 67 /** 68 * @return a default Opcodes instance for when the exact Opcodes to use doesn't matter or isn't known 69 */ 70 @Nonnull getDefault()71 public static Opcodes getDefault() { 72 // The last pre-art api 73 return forApi(20); 74 } 75 Opcodes(int api, int artVersion)76 private Opcodes(int api, int artVersion) { 77 78 79 if (api >= 21) { 80 this.api = api; 81 this.artVersion = mapApiToArtVersion(api); 82 } else if (artVersion >= 0 && artVersion < 39) { 83 this.api = mapArtVersionToApi(artVersion); 84 this.artVersion = artVersion; 85 } else { 86 this.api = api; 87 this.artVersion = artVersion; 88 } 89 90 opcodeValues = new EnumMap<Opcode, Short>(Opcode.class); 91 opcodesByName = Maps.newHashMap(); 92 93 int version; 94 if (isArt()) { 95 version = this.artVersion; 96 } else { 97 version = this.api; 98 } 99 100 for (Opcode opcode: Opcode.values()) { 101 RangeMap<Integer, Short> versionToValueMap; 102 103 if (isArt()) { 104 versionToValueMap = opcode.artVersionToValueMap; 105 } else { 106 versionToValueMap = opcode.apiToValueMap; 107 } 108 109 Short opcodeValue = versionToValueMap.get(version); 110 if (opcodeValue != null) { 111 if (!opcode.format.isPayloadFormat) { 112 opcodesByValue[opcodeValue] = opcode; 113 } 114 opcodeValues.put(opcode, opcodeValue); 115 opcodesByName.put(opcode.name.toLowerCase(), opcode); 116 } 117 } 118 } 119 120 @Nullable getOpcodeByName(@onnull String opcodeName)121 public Opcode getOpcodeByName(@Nonnull String opcodeName) { 122 return opcodesByName.get(opcodeName.toLowerCase()); 123 } 124 125 @Nullable getOpcodeByValue(int opcodeValue)126 public Opcode getOpcodeByValue(int opcodeValue) { 127 switch (opcodeValue) { 128 case 0x100: 129 return Opcode.PACKED_SWITCH_PAYLOAD; 130 case 0x200: 131 return Opcode.SPARSE_SWITCH_PAYLOAD; 132 case 0x300: 133 return Opcode.ARRAY_PAYLOAD; 134 default: 135 if (opcodeValue >= 0 && opcodeValue < opcodesByValue.length) { 136 return opcodesByValue[opcodeValue]; 137 } 138 return null; 139 } 140 } 141 142 @Nullable getOpcodeValue(@onnull Opcode opcode)143 public Short getOpcodeValue(@Nonnull Opcode opcode) { 144 return opcodeValues.get(opcode); 145 } 146 isArt()147 public boolean isArt() { 148 return artVersion != NO_VERSION; 149 } 150 } 151