1b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/* 2b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * ProGuard -- shrinking, optimization, obfuscation, and preverification 3b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * of Java bytecode. 4b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 5b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu) 6b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 7b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This program is free software; you can redistribute it and/or modify it 8b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * under the terms of the GNU General Public License as published by the Free 9b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Software Foundation; either version 2 of the License, or (at your option) 10b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * any later version. 11b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 12b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This program is distributed in the hope that it will be useful, but WITHOUT 13b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * more details. 16b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 17b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * You should have received a copy of the GNU General Public License along 18b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * with this program; if not, write to the Free Software Foundation, Inc., 19b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 21b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopackage proguard.classfile.instruction; 22b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 23b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.*; 24b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.attribute.CodeAttribute; 25b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.instruction.visitor.InstructionVisitor; 26b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 27b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/** 28b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This Instruction represents a simple instruction without variable arguments 29b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * or constant pool references. 30b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 31b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @author Eric Lafortune 32b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 33b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopublic class SimpleInstruction extends Instruction 34b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato{ 35b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public int constant; 36b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 37b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 38b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 39b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates an uninitialized SimpleInstruction. 40b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 41b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public SimpleInstruction() {} 42b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 43b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 44b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 45b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates a new SimpleInstruction with the given opcode. 46b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 47b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public SimpleInstruction(byte opcode) 48b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 49b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this(opcode, embeddedConstant(opcode)); 50b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 51b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 52b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 53b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 54b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates a new SimpleInstruction with the given opcode and constant. 55b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 56b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public SimpleInstruction(byte opcode, int constant) 57b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 58b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.opcode = opcode; 59b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.constant = constant; 60b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 61b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 62b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 63b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 64b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Copies the given instruction into this instruction. 65b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param simpleInstruction the instruction to be copied. 66b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @return this instruction. 67b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 68b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public SimpleInstruction copy(SimpleInstruction simpleInstruction) 69b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 70b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.opcode = simpleInstruction.opcode; 71b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.constant = simpleInstruction.constant; 72b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 73b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return this; 74b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 75b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 76b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 77b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 78b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Return the embedded constant of the given opcode, or 0 if the opcode 79b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * doesn't have one. 80b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 81b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private static int embeddedConstant(byte opcode) 82b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 83b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato switch (opcode) 84b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 85b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_M1: return -1; 86b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 87b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_1: 88b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_LCONST_1: 89b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_FCONST_1: 90b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_DCONST_1: return 1; 91b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 92b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_2: 93b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_FCONST_2: return 2; 94b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 95b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_3: return 3; 96b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 97b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_4: return 4; 98b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 99b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_5: return 5; 100b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 101b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato default: return 0; 102b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 103b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 104b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 105b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 106b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Implementations for Instruction. 107b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 108b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public byte canonicalOpcode() 109b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 110b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Replace any _1, _2, _3,... extension by _0. 111b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato switch (opcode) 112b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 113b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_M1: 114b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_0: 115b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_1: 116b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_2: 117b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_3: 118b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_4: 119b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_5: 120b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_BIPUSH: 121b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_SIPUSH: return InstructionConstants.OP_ICONST_0; 122b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 123b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_LCONST_0: 124b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_LCONST_1: return InstructionConstants.OP_LCONST_0; 125b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 126b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_FCONST_0: 127b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_FCONST_1: 128b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_FCONST_2: return InstructionConstants.OP_FCONST_0; 129b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 130b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_DCONST_0: 131b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_DCONST_1: return InstructionConstants.OP_DCONST_0; 132b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 133b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato default: return opcode; 134b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 135b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 136b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 137b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public Instruction shrink() 138b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 139b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Reconstruct the opcode of the shortest instruction, if there are 140b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // any alternatives. 141b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato switch (opcode) 142b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 143b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_M1: 144b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_0: 145b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_1: 146b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_2: 147b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_3: 148b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_4: 149b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_ICONST_5: 150b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_BIPUSH: 151b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_SIPUSH: 152b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato switch (requiredConstantSize()) 153b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 154b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case 0: 155b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato opcode = (byte)(InstructionConstants.OP_ICONST_0 + constant); 156b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato break; 157b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case 1: 158b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato opcode = InstructionConstants.OP_BIPUSH; 159b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato break; 160b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case 2: 161b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato opcode = InstructionConstants.OP_SIPUSH; 162b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato break; 163b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 164b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato break; 165b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 166b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_LCONST_0: 167b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_LCONST_1: 168b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato opcode = (byte)(InstructionConstants.OP_LCONST_0 + constant); 169b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato break; 170b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 171b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_FCONST_0: 172b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_FCONST_1: 173b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_FCONST_2: 174b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato opcode = (byte)(InstructionConstants.OP_FCONST_0 + constant); 175b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato break; 176b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 177b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_DCONST_0: 178b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato case InstructionConstants.OP_DCONST_1: 179b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato opcode = (byte)(InstructionConstants.OP_DCONST_0 + constant); 180b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato break; 181b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 182b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 183b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return this; 184b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 185b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 186b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato protected void readInfo(byte[] code, int offset) 187b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 188b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato int constantSize = constantSize(); 189b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 190b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Also initialize embedded constants that are different from 0. 191b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato constant = constantSize == 0 ? 192b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato embeddedConstant(opcode) : 193b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato readSignedValue(code, offset, constantSize); 194b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 195b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 196b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 197b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato protected void writeInfo(byte[] code, int offset) 198b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 199b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato int constantSize = constantSize(); 200b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 201b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (requiredConstantSize() > constantSize) 202b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 203b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato throw new IllegalArgumentException("Instruction has invalid constant size ("+this.toString(offset)+")"); 204b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 205b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 206b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato writeSignedValue(code, offset, constant, constantSize); 207b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 208b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 209b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 210b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public int length(int offset) 211b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 212b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return 1 + constantSize(); 213b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 214b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 215b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 216b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, InstructionVisitor instructionVisitor) 217b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 218b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato instructionVisitor.visitSimpleInstruction(clazz, method, codeAttribute, offset, this); 219b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 220b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 221b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 222b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Implementations for Object. 223b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 224b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public String toString() 225b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 226b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return getName() + 227b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato (constantSize() > 0 ? " "+constant : ""); 228b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 229b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 230b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 231b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Small utility methods. 232b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 233b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 234b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Returns the constant size for this instruction. 235b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 236b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private int constantSize() 237b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 238b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return opcode == InstructionConstants.OP_BIPUSH || 239b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato opcode == InstructionConstants.OP_NEWARRAY ? 1 : 240b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato opcode == InstructionConstants.OP_SIPUSH ? 2 : 241b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 0; 242b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 243b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 244b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 245b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 246b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Computes the required constant size for this instruction. 247b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 248b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private int requiredConstantSize() 249b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 250b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return constant >= -1 && constant <= 5 ? 0 : 251b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang (byte)constant == constant ? 1 : 252b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang (short)constant == constant ? 2 : 253b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 4; 254b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 255b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato} 256