| /* |
| * 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.classfile.util; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.attribute.CodeAttribute; |
| import proguard.classfile.attribute.annotation.*; |
| import proguard.classfile.attribute.annotation.visitor.ElementValueVisitor; |
| import proguard.classfile.attribute.visitor.AllAttributeVisitor; |
| import proguard.classfile.constant.*; |
| import proguard.classfile.constant.visitor.ConstantVisitor; |
| import proguard.classfile.instruction.*; |
| import proguard.classfile.instruction.visitor.*; |
| import proguard.classfile.visitor.MemberVisitor; |
| |
| /** |
| * This ElementValueVisitor initializes the field references of the |
| * EnumConstantElementValue instances that it visits. |
| * |
| * @author Eric Lafortune |
| */ |
| public class EnumFieldReferenceInitializer |
| extends SimplifiedVisitor |
| implements ElementValueVisitor, |
| InstructionVisitor, |
| ConstantVisitor |
| { |
| //* |
| private static final boolean DEBUG = false; |
| /*/ |
| private static boolean DEBUG = true; |
| //*/ |
| |
| private MemberVisitor enumFieldFinder = new AllAttributeVisitor( |
| new AllInstructionVisitor(this)); |
| |
| // Fields acting as parameters and return values for the visitors. |
| private String enumTypeName; |
| private String enumConstantName; |
| private boolean enumConstantNameFound; |
| private Clazz referencedEnumClass; |
| private Field referencedEnumField; |
| |
| |
| // Implementations for ElementValueVisitor. |
| |
| public void visitAnyElementValue(Clazz clazz, Annotation annotation, ElementValue elementValue) {} |
| |
| |
| public void visitEnumConstantElementValue(Clazz clazz, Annotation annotation, EnumConstantElementValue enumConstantElementValue) |
| { |
| |
| if (enumConstantElementValue.referencedClasses != null && |
| enumConstantElementValue.referencedClasses.length > 0) |
| { |
| referencedEnumClass = enumConstantElementValue.referencedClasses[0]; |
| if (referencedEnumClass != null) |
| { |
| // Try to find the enum field through the static enum |
| // initialization code (at least for program classes). |
| enumTypeName = enumConstantElementValue.getTypeName(clazz); |
| enumConstantName = enumConstantElementValue.getConstantName(clazz); |
| referencedEnumField = null; |
| referencedEnumClass.methodAccept(ClassConstants.METHOD_NAME_CLINIT, |
| ClassConstants.METHOD_TYPE_CLINIT, |
| enumFieldFinder); |
| |
| // Otherwise try to find the enum field through its name. |
| // The constant name could be different from the field name, if |
| // the latter is already obfuscated. |
| if (referencedEnumField == null) |
| { |
| referencedEnumField = |
| referencedEnumClass.findField(enumConstantName, |
| enumTypeName); |
| } |
| |
| if (DEBUG) |
| { |
| System.out.println("EnumFieldReferenceInitializer: ["+referencedEnumClass.getName()+"."+enumConstantName+"] -> "+referencedEnumField); |
| } |
| |
| enumConstantElementValue.referencedField = referencedEnumField; |
| } |
| } |
| } |
| |
| |
| // Implementations for InstructionVisitor. |
| |
| public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {} |
| |
| |
| public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction) |
| { |
| switch (constantInstruction.opcode) |
| { |
| case InstructionConstants.OP_LDC: |
| case InstructionConstants.OP_LDC_W: |
| case InstructionConstants.OP_PUTSTATIC: |
| clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this); |
| break; |
| } |
| } |
| |
| |
| // Implementations for ConstantVisitor. |
| |
| public void visitAnyConstant(Clazz clazz, Constant constant) {} |
| |
| |
| public void visitStringConstant(Clazz clazz, StringConstant stringConstant) |
| { |
| enumConstantNameFound = |
| enumConstantName.equals(stringConstant.getString(clazz)); |
| } |
| |
| |
| public void visitFieldrefConstant(Clazz clazz, FieldrefConstant fieldrefConstant) |
| { |
| if (enumConstantNameFound) |
| { |
| if (enumTypeName.equals(fieldrefConstant.getType(clazz))) |
| { |
| referencedEnumField = (Field)fieldrefConstant.referencedMember; |
| } |
| |
| enumConstantNameFound = false; |
| } |
| } |
| } |