| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2009 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.info; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.util.MethodLinker; |
| import proguard.evaluation.value.*; |
| |
| /** |
| * This class stores some optimization information that can be attached to |
| * a field. |
| * |
| * @author Eric Lafortune |
| */ |
| public class FieldOptimizationInfo |
| { |
| private static final SpecificValueFactory VALUE_FACTORY = new SpecificValueFactory(); |
| |
| private boolean isWritten; |
| private boolean isRead; |
| private boolean canBeMadePrivate = true; |
| private ReferenceValue referencedClass; |
| private Value value; |
| |
| |
| public FieldOptimizationInfo(Clazz clazz, Field field) |
| { |
| isWritten = |
| isRead = (field.getAccessFlags() & ClassConstants.INTERNAL_ACC_VOLATILE) != 0; |
| value = initialValue(field.getDescriptor(clazz)); |
| } |
| |
| |
| public void setWritten() |
| { |
| isWritten = true; |
| } |
| |
| |
| public boolean isWritten() |
| { |
| return isWritten; |
| } |
| |
| |
| public void setRead() |
| { |
| isRead = true; |
| } |
| |
| |
| public boolean isRead() |
| { |
| return isRead; |
| } |
| |
| |
| public void setCanNotBeMadePrivate() |
| { |
| canBeMadePrivate = false; |
| } |
| |
| |
| public boolean canBeMadePrivate() |
| { |
| return canBeMadePrivate; |
| } |
| |
| |
| public void generalizeReferencedClass(ReferenceValue referencedClass) |
| { |
| this.referencedClass = this.referencedClass != null ? |
| this.referencedClass.generalize(referencedClass) : |
| referencedClass; |
| } |
| |
| |
| public ReferenceValue getReferencedClass() |
| { |
| return referencedClass; |
| } |
| |
| |
| public void generalizeValue(Value value) |
| { |
| this.value = this.value != null ? |
| this.value.generalize(value) : |
| value; |
| } |
| |
| |
| public Value getValue() |
| { |
| return value; |
| } |
| |
| |
| // Small utility methods. |
| |
| private Value initialValue(String type) |
| { |
| switch (type.charAt(0)) |
| { |
| case ClassConstants.INTERNAL_TYPE_BOOLEAN: |
| case ClassConstants.INTERNAL_TYPE_BYTE: |
| case ClassConstants.INTERNAL_TYPE_CHAR: |
| case ClassConstants.INTERNAL_TYPE_SHORT: |
| case ClassConstants.INTERNAL_TYPE_INT: |
| return VALUE_FACTORY.createIntegerValue(0); |
| |
| case ClassConstants.INTERNAL_TYPE_LONG: |
| return VALUE_FACTORY.createLongValue(0L); |
| |
| case ClassConstants.INTERNAL_TYPE_FLOAT: |
| return VALUE_FACTORY.createFloatValue(0.0f); |
| |
| case ClassConstants.INTERNAL_TYPE_DOUBLE: |
| return VALUE_FACTORY.createDoubleValue(0.0); |
| |
| case ClassConstants.INTERNAL_TYPE_CLASS_START: |
| case ClassConstants.INTERNAL_TYPE_ARRAY: |
| return VALUE_FACTORY.createReferenceValueNull(); |
| |
| default: |
| throw new IllegalArgumentException("Invalid type ["+type+"]"); |
| } |
| } |
| |
| |
| public static void setFieldOptimizationInfo(Clazz clazz, Field field) |
| { |
| MethodLinker.lastMember(field).setVisitorInfo(new FieldOptimizationInfo(clazz, field)); |
| } |
| |
| |
| public static FieldOptimizationInfo getFieldOptimizationInfo(Field field) |
| { |
| Object visitorInfo = MethodLinker.lastMember(field).getVisitorInfo(); |
| |
| return visitorInfo instanceof FieldOptimizationInfo ? |
| (FieldOptimizationInfo)visitorInfo : |
| null; |
| } |
| } |