| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu) |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| package proguard.classfile.attribute; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.attribute.visitor.*; |
| import proguard.classfile.instruction.*; |
| import proguard.classfile.instruction.visitor.InstructionVisitor; |
| |
| /** |
| * This Attribute represents a code attribute. |
| * |
| * @author Eric Lafortune |
| */ |
| public class CodeAttribute extends Attribute |
| { |
| public int u2maxStack; |
| public int u2maxLocals; |
| public int u4codeLength; |
| public byte[] code; |
| public int u2exceptionTableLength; |
| public ExceptionInfo[] exceptionTable; |
| public int u2attributesCount; |
| public Attribute[] attributes; |
| |
| |
| /** |
| * Creates an uninitialized CodeAttribute. |
| */ |
| public CodeAttribute() |
| { |
| } |
| |
| |
| /** |
| * Creates an initialized CodeAttribute. |
| */ |
| public CodeAttribute(int u2attributeNameIndex, |
| int u2maxStack, |
| int u2maxLocals, |
| int u4codeLength, |
| byte[] code, |
| int u2exceptionTableLength, |
| ExceptionInfo[] exceptionTable, |
| int u2attributesCount, |
| Attribute[] attributes) |
| { |
| super(u2attributeNameIndex); |
| |
| this.u2maxStack = u2maxStack; |
| this.u2maxLocals = u2maxLocals; |
| this.u4codeLength = u4codeLength; |
| this.code = code; |
| this.u2exceptionTableLength = u2exceptionTableLength; |
| this.exceptionTable = exceptionTable; |
| this.u2attributesCount = u2attributesCount; |
| this.attributes = attributes; |
| } |
| |
| |
| /** |
| * Returns the (first) attribute with the given name. |
| */ |
| public Attribute getAttribute(Clazz clazz, String name) |
| { |
| for (int index = 0; index < u2attributesCount; index++) |
| { |
| Attribute attribute = attributes[index]; |
| if (attribute.getAttributeName(clazz).equals(name)) |
| { |
| return attribute; |
| } |
| } |
| |
| return null; |
| } |
| |
| |
| // Implementations for Attribute. |
| |
| public void accept(Clazz clazz, Method method, AttributeVisitor attributeVisitor) |
| { |
| attributeVisitor.visitCodeAttribute(clazz, method, this); |
| } |
| |
| |
| /** |
| * Applies the given instruction visitor to all instructions. |
| */ |
| public void instructionsAccept(Clazz clazz, Method method, InstructionVisitor instructionVisitor) |
| { |
| instructionsAccept(clazz, method, 0, u4codeLength, instructionVisitor); |
| } |
| |
| |
| /** |
| * Applies the given instruction visitor to the instruction at the specified |
| * offset. |
| */ |
| public void instructionAccept(Clazz clazz, Method method, int offset, InstructionVisitor instructionVisitor) |
| { |
| Instruction instruction = InstructionFactory.create(code, offset); |
| instruction.accept(clazz, method, this, offset, instructionVisitor); |
| } |
| |
| |
| /** |
| * Applies the given instruction visitor to all instructions in the |
| * specified range of offsets. |
| */ |
| public void instructionsAccept(Clazz clazz, Method method, int startOffset, int endOffset, InstructionVisitor instructionVisitor) |
| { |
| int offset = startOffset; |
| |
| while (offset < endOffset) |
| { |
| // Note that the instruction is only volatile. |
| Instruction instruction = InstructionFactory.create(code, offset); |
| int instructionLength = instruction.length(offset); |
| instruction.accept(clazz, method, this, offset, instructionVisitor); |
| offset += instructionLength; |
| } |
| } |
| |
| |
| /** |
| * Applies the given exception visitor to all exceptions. |
| */ |
| public void exceptionsAccept(Clazz clazz, Method method, ExceptionInfoVisitor exceptionInfoVisitor) |
| { |
| for (int index = 0; index < u2exceptionTableLength; index++) |
| { |
| // We don't need double dispatching here, since there is only one |
| // type of ExceptionInfo. |
| exceptionInfoVisitor.visitExceptionInfo(clazz, method, this, exceptionTable[index]); |
| } |
| } |
| |
| |
| /** |
| * Applies the given exception visitor to all exceptions that are applicable |
| * to the instruction at the specified offset. |
| */ |
| public void exceptionsAccept(Clazz clazz, Method method, int offset, ExceptionInfoVisitor exceptionInfoVisitor) |
| { |
| for (int index = 0; index < u2exceptionTableLength; index++) |
| { |
| ExceptionInfo exceptionInfo = exceptionTable[index]; |
| if (exceptionInfo.isApplicable(offset)) |
| { |
| exceptionInfoVisitor.visitExceptionInfo(clazz, method, this, exceptionInfo); |
| } |
| } |
| } |
| |
| |
| /** |
| * Applies the given exception visitor to all exceptions that are applicable |
| * to any of the instructions in the specified range of offsets. |
| */ |
| public void exceptionsAccept(Clazz clazz, Method method, int startOffset, int endOffset, ExceptionInfoVisitor exceptionInfoVisitor) |
| { |
| for (int index = 0; index < u2exceptionTableLength; index++) |
| { |
| ExceptionInfo exceptionInfo = exceptionTable[index]; |
| if (exceptionInfo.isApplicable(startOffset, endOffset)) |
| { |
| exceptionInfoVisitor.visitExceptionInfo(clazz, method, this, exceptionInfo); |
| } |
| } |
| } |
| |
| |
| /** |
| * Applies the given attribute visitor to all attributes. |
| */ |
| public void attributesAccept(Clazz clazz, Method method, AttributeVisitor attributeVisitor) |
| { |
| for (int index = 0; index < u2attributesCount; index++) |
| { |
| attributes[index].accept(clazz, method, this, attributeVisitor); |
| } |
| } |
| } |