| /* |
| * 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.optimize; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.util.*; |
| import proguard.classfile.visitor.MemberVisitor; |
| import proguard.evaluation.value.Value; |
| import proguard.optimize.evaluation.StoringInvocationUnit; |
| |
| /** |
| * This <code>MemberVisitor</code> delegates its visits to program methods |
| * to another given <code>MemberVisitor</code>, for each method parameter |
| * that has been marked as constant. |
| * |
| * @see StoringInvocationUnit |
| * @author Eric Lafortune |
| */ |
| public class ConstantParameterFilter |
| extends SimplifiedVisitor |
| implements MemberVisitor |
| { |
| private final MemberVisitor constantParameterVisitor; |
| |
| |
| /** |
| * Creates a new ConstantParameterFilter. |
| * @param constantParameterVisitor the <code>MemberVisitor</code> to which |
| * visits will be delegated. |
| */ |
| public ConstantParameterFilter(MemberVisitor constantParameterVisitor) |
| { |
| this.constantParameterVisitor = constantParameterVisitor; |
| } |
| |
| |
| // Implementations for MemberVisitor. |
| |
| public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) |
| { |
| // All parameters of non-static methods are shifted by one in the local |
| // variable frame. |
| int firstParameterIndex = |
| (programMethod.getAccessFlags() & ClassConstants.ACC_STATIC) != 0 ? |
| 0 : 1; |
| |
| int parameterCount = |
| ClassUtil.internalMethodParameterCount(programMethod.getDescriptor(programClass)); |
| |
| for (int index = firstParameterIndex; index < parameterCount; index++) |
| { |
| Value value = StoringInvocationUnit.getMethodParameterValue(programMethod, index); |
| if (value != null && |
| value.isParticular()) |
| { |
| constantParameterVisitor.visitProgramMethod(programClass, programMethod); |
| } |
| } |
| } |
| } |