| /* |
| * 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.attribute.visitor.AttributeVisitor; |
| import proguard.classfile.editor.MethodInvocationFixer; |
| import proguard.classfile.util.SimplifiedVisitor; |
| import proguard.classfile.visitor.MemberVisitor; |
| import proguard.optimize.info.ParameterUsageMarker; |
| import proguard.optimize.peephole.VariableShrinker; |
| |
| /** |
| * This MemberVisitor makes all methods that it visits static, if their 'this' |
| * parameters are unused. |
| * |
| * @see ParameterUsageMarker |
| * @see MethodInvocationFixer |
| * @see VariableShrinker |
| * @author Eric Lafortune |
| */ |
| public class MethodStaticizer |
| extends SimplifiedVisitor |
| implements MemberVisitor, |
| AttributeVisitor |
| { |
| private final MemberVisitor extraStaticMemberVisitor; |
| |
| |
| /** |
| * Creates a new MethodStaticizer. |
| */ |
| public MethodStaticizer() |
| { |
| this(null); |
| } |
| |
| |
| /** |
| * Creates a new MethodStaticizer with an extra visitor. |
| * @param extraStaticMemberVisitor an optional extra visitor for all |
| * methods that have been made static. |
| */ |
| public MethodStaticizer(MemberVisitor extraStaticMemberVisitor) |
| { |
| this.extraStaticMemberVisitor = extraStaticMemberVisitor; |
| } |
| |
| |
| // Implementations for MemberVisitor. |
| |
| public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) |
| { |
| // Is the 'this' parameter being used? |
| if (!ParameterUsageMarker.isParameterUsed(programMethod, 0)) |
| { |
| // Make the method static. |
| programMethod.u2accessFlags = |
| (programMethod.getAccessFlags() & ~ClassConstants.ACC_FINAL) | |
| ClassConstants.ACC_STATIC; |
| |
| // Visit the method, if required. |
| if (extraStaticMemberVisitor != null) |
| { |
| extraStaticMemberVisitor.visitProgramMethod(programClass, programMethod); |
| } |
| } |
| } |
| } |