| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2014 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.obfuscate; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.attribute.*; |
| import proguard.classfile.attribute.visitor.AttributeVisitor; |
| import proguard.classfile.util.SimplifiedVisitor; |
| |
| /** |
| * This AttributeVisitor trims and marks all local variable (type) table |
| * attributes that it visits. It keeps parameter names and types and removes |
| * the ordinary local variable names and types. |
| * |
| * @author Eric Lafortune |
| */ |
| public class ParameterNameMarker |
| extends SimplifiedVisitor |
| implements AttributeVisitor |
| { |
| private final AttributeVisitor attributeUsageMarker; |
| |
| |
| /** |
| * Constructs a new ParameterNameMarker. |
| * @param attributeUsageMarker the marker that will be used to mark |
| * attributes containing local variable info. |
| */ |
| public ParameterNameMarker(AttributeVisitor attributeUsageMarker) |
| { |
| this.attributeUsageMarker = attributeUsageMarker; |
| } |
| |
| |
| // Implementations for AttributeVisitor. |
| |
| public void visitAnyAttribute(Clazz clazz, Attribute attribute) {} |
| |
| |
| public void visitLocalVariableTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTableAttribute localVariableTableAttribute) |
| { |
| if (!AttributeUsageMarker.isUsed(localVariableTableAttribute) && |
| hasParameters(clazz, method)) |
| { |
| // Shift the entries that start at offset 0 to the front. |
| int newIndex = 0; |
| |
| for (int index = 0; index < localVariableTableAttribute.u2localVariableTableLength; index++) |
| { |
| LocalVariableInfo localVariableInfo = |
| localVariableTableAttribute.localVariableTable[index]; |
| |
| if (localVariableInfo.u2startPC == 0) |
| { |
| localVariableTableAttribute.localVariableTable[newIndex++] = |
| localVariableInfo; |
| } |
| } |
| |
| // Trim the table. |
| localVariableTableAttribute.u2localVariableTableLength = newIndex; |
| |
| // Mark the table if there are any entries. |
| if (newIndex > 0) |
| { |
| attributeUsageMarker.visitLocalVariableTableAttribute(clazz, method, codeAttribute, localVariableTableAttribute); |
| } |
| } |
| } |
| |
| |
| public void visitLocalVariableTypeTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTypeTableAttribute localVariableTypeTableAttribute) |
| { |
| if (!AttributeUsageMarker.isUsed(localVariableTypeTableAttribute) && |
| hasParameters(clazz, method)) |
| { |
| // Shift the entries that start at offset 0 to the front. |
| int newIndex = 0; |
| |
| for (int index = 0; index < localVariableTypeTableAttribute.u2localVariableTypeTableLength; index++) |
| { |
| LocalVariableTypeInfo localVariableTypeInfo = |
| localVariableTypeTableAttribute.localVariableTypeTable[index]; |
| |
| if (localVariableTypeInfo.u2startPC == 0) |
| { |
| localVariableTypeTableAttribute.localVariableTypeTable[newIndex++] = |
| localVariableTypeInfo; |
| } |
| } |
| |
| // Trim the table. |
| localVariableTypeTableAttribute.u2localVariableTypeTableLength = newIndex; |
| |
| // Mark the table if there are any entries. |
| if (newIndex > 0) |
| { |
| attributeUsageMarker.visitLocalVariableTypeTableAttribute(clazz, method, codeAttribute, localVariableTypeTableAttribute); |
| } |
| } |
| } |
| |
| |
| // Small utility methods. |
| |
| private boolean hasParameters(Clazz clazz, Method method) |
| { |
| return method.getDescriptor(clazz).charAt(1) != ClassConstants.METHOD_ARGUMENTS_CLOSE; |
| } |
| } |