1b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/* 2b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * ProGuard -- shrinking, optimization, obfuscation, and preverification 3b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * of Java bytecode. 4b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 59f606f95f03a75961498803e24bee6799a7c0885Ying Wang * Copyright (c) 2002-2009 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.attribute; 22b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 23b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.*; 24b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.attribute.visitor.*; 25b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.instruction.*; 26b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.instruction.visitor.InstructionVisitor; 27b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 28b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/** 29b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This Attribute represents a code attribute. 30b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 31b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @author Eric Lafortune 32b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 33b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopublic class CodeAttribute extends Attribute 34b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato{ 35b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public int u2maxStack; 36b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public int u2maxLocals; 37b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public int u4codeLength; 38b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public byte[] code; 39b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public int u2exceptionTableLength; 40b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public ExceptionInfo[] exceptionTable; 41b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public int u2attributesCount; 42b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public Attribute[] attributes; 43b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 44b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 45b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 46b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates an uninitialized CodeAttribute. 47b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 48b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public CodeAttribute() 49b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 50b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 51b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 52b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 53b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 54b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Creates an initialized CodeAttribute. 55b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 56b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public CodeAttribute(int u2attributeNameIndex, 57b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato int u2maxStack, 58b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato int u2maxLocals, 59b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato int u4codeLength, 60b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato byte[] code, 61b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato int u2exceptionTableLength, 62b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato ExceptionInfo[] exceptionTable, 63b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato int u2attributesCount, 64b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Attribute[] attributes) 65b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 66b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato super(u2attributeNameIndex); 67b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 68b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.u2maxStack = u2maxStack; 69b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.u2maxLocals = u2maxLocals; 70b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.u4codeLength = u4codeLength; 71b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.code = code; 72b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.u2exceptionTableLength = u2exceptionTableLength; 73b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.exceptionTable = exceptionTable; 74b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.u2attributesCount = u2attributesCount; 75b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this.attributes = attributes; 76b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 77b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 78b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 79b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 80b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Returns the (first) attribute with the given name. 81b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 82b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public Attribute getAttribute(Clazz clazz, String name) 83b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 84b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato for (int index = 0; index < u2attributesCount; index++) 85b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 86b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Attribute attribute = attributes[index]; 87b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (attribute.getAttributeName(clazz).equals(name)) 88b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 89b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return attribute; 90b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 91b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 92b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 93b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return null; 94b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 95b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 96b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 97b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Implementations for Attribute. 98b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 99b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void accept(Clazz clazz, Method method, AttributeVisitor attributeVisitor) 100b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 101b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato attributeVisitor.visitCodeAttribute(clazz, method, this); 102b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 103b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 104b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 105b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 106b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Applies the given instruction visitor to all instructions. 107b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 108b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void instructionsAccept(Clazz clazz, Method method, InstructionVisitor instructionVisitor) 109b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 110b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato instructionsAccept(clazz, method, 0, u4codeLength, instructionVisitor); 111b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 112b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 113b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 114b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 115b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Applies the given instruction visitor to the instruction at the specified 116b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * offset. 117b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 118b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void instructionAccept(Clazz clazz, Method method, int offset, InstructionVisitor instructionVisitor) 119b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 120b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Instruction instruction = InstructionFactory.create(code, offset); 121b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato instruction.accept(clazz, method, this, offset, instructionVisitor); 122b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 123b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 124b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 125b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 126b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Applies the given instruction visitor to all instructions in the 127b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * specified range of offsets. 128b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 129b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void instructionsAccept(Clazz clazz, Method method, int startOffset, int endOffset, InstructionVisitor instructionVisitor) 130b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 131b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato int offset = startOffset; 132b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 133b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato while (offset < endOffset) 134b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 135b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Note that the instruction is only volatile. 136b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Instruction instruction = InstructionFactory.create(code, offset); 137b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato int instructionLength = instruction.length(offset); 138b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato instruction.accept(clazz, method, this, offset, instructionVisitor); 139b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato offset += instructionLength; 140b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 141b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 142b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 143b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 144b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 145b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Applies the given exception visitor to all exceptions. 146b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 147b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void exceptionsAccept(Clazz clazz, Method method, ExceptionInfoVisitor exceptionInfoVisitor) 148b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 149b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato for (int index = 0; index < u2exceptionTableLength; index++) 150b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 151b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // We don't need double dispatching here, since there is only one 152b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // type of ExceptionInfo. 153b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato exceptionInfoVisitor.visitExceptionInfo(clazz, method, this, exceptionTable[index]); 154b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 155b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 156b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 157b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 158b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 159b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Applies the given exception visitor to all exceptions that are applicable 160b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * to the instruction at the specified offset. 161b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 162b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void exceptionsAccept(Clazz clazz, Method method, int offset, ExceptionInfoVisitor exceptionInfoVisitor) 163b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 164b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato for (int index = 0; index < u2exceptionTableLength; index++) 165b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 166b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato ExceptionInfo exceptionInfo = exceptionTable[index]; 167b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (exceptionInfo.isApplicable(offset)) 168b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 169b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato exceptionInfoVisitor.visitExceptionInfo(clazz, method, this, exceptionInfo); 170b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 171b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 172b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 173b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 174b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 175b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 176b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Applies the given exception visitor to all exceptions that are applicable 177b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * to any of the instructions in the specified range of offsets. 178b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 179b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void exceptionsAccept(Clazz clazz, Method method, int startOffset, int endOffset, ExceptionInfoVisitor exceptionInfoVisitor) 180b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 181b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato for (int index = 0; index < u2exceptionTableLength; index++) 182b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 183b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato ExceptionInfo exceptionInfo = exceptionTable[index]; 184b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (exceptionInfo.isApplicable(startOffset, endOffset)) 185b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 186b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato exceptionInfoVisitor.visitExceptionInfo(clazz, method, this, exceptionInfo); 187b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 188b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 189b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 190b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 191b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 192b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 193b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Applies the given attribute visitor to all attributes. 194b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 195b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void attributesAccept(Clazz clazz, Method method, AttributeVisitor attributeVisitor) 196b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 197b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato for (int index = 0; index < u2attributesCount; index++) 198b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 199b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato attributes[index].accept(clazz, method, this, attributeVisitor); 200b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 201b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 202b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato} 203