| /* |
| * 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.editor.ClassReferenceFixer; |
| import proguard.classfile.util.*; |
| import proguard.classfile.visitor.MemberVisitor; |
| import proguard.evaluation.value.Value; |
| import proguard.optimize.evaluation.StoringInvocationUnit; |
| |
| /** |
| * This MemberVisitor specializes parameters in the descriptors of the |
| * methods that it visits. |
| * |
| * @see StoringInvocationUnit |
| * @see ClassReferenceFixer |
| * @author Eric Lafortune |
| */ |
| public class MemberDescriptorSpecializer |
| extends SimplifiedVisitor |
| implements MemberVisitor |
| { |
| private static final boolean DEBUG = false; |
| |
| |
| private final MemberVisitor extraParameterMemberVisitor; |
| |
| |
| /** |
| * Creates a new MethodDescriptorShrinker. |
| */ |
| public MemberDescriptorSpecializer() |
| { |
| this(null); |
| } |
| |
| |
| /** |
| * Creates a new MethodDescriptorShrinker with an extra visitor. |
| * @param extraParameterMemberVisitor an optional extra visitor for all |
| * class members whose parameters have |
| * been specialized. |
| */ |
| public MemberDescriptorSpecializer(MemberVisitor extraParameterMemberVisitor) |
| { |
| this.extraParameterMemberVisitor = extraParameterMemberVisitor; |
| } |
| |
| |
| // Implementations for MemberVisitor. |
| |
| public void visitProgramField(ProgramClass programClass, ProgramField programField) |
| { |
| Value parameterValue = StoringInvocationUnit.getFieldValue(programField); |
| if (parameterValue.computationalType() == Value.TYPE_REFERENCE) |
| { |
| Clazz referencedClass = parameterValue.referenceValue().getReferencedClass(); |
| if (programField.referencedClass != referencedClass) |
| { |
| if (DEBUG) |
| { |
| System.out.println("MemberDescriptorSpecializer: "+programClass.getName()+"."+programField.getName(programClass)+" "+programField.getDescriptor(programClass)); |
| System.out.println(" "+programField.referencedClass.getName()+" -> "+referencedClass.getName()); |
| } |
| |
| programField.referencedClass = referencedClass; |
| |
| // Visit the field, if required. |
| if (extraParameterMemberVisitor != null) |
| { |
| extraParameterMemberVisitor.visitProgramField(programClass, programField); |
| } |
| } |
| } |
| } |
| |
| |
| 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)); |
| |
| int classIndex = 0; |
| |
| // Go over the parameters. |
| for (int parameterIndex = firstParameterIndex; parameterIndex < parameterCount; parameterIndex++) |
| { |
| Value parameterValue = StoringInvocationUnit.getMethodParameterValue(programMethod, parameterIndex); |
| if (parameterValue.computationalType() == Value.TYPE_REFERENCE) |
| { |
| Clazz referencedClass = parameterValue.referenceValue().getReferencedClass(); |
| if (programMethod.referencedClasses[classIndex] != referencedClass) |
| { |
| if (DEBUG) |
| { |
| System.out.println("MemberDescriptorSpecializer: "+programClass.getName()+"."+programMethod.getName(programClass)+programMethod.getDescriptor(programClass)); |
| System.out.println(" "+programMethod.referencedClasses[classIndex].getName()+" -> "+referencedClass.getName()); |
| } |
| |
| programMethod.referencedClasses[classIndex] = referencedClass; |
| |
| // Visit the method, if required. |
| if (extraParameterMemberVisitor != null) |
| { |
| extraParameterMemberVisitor.visitProgramMethod(programClass, programMethod); |
| } |
| } |
| |
| classIndex++; |
| } |
| } |
| } |
| } |