| /* |
| * 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.evaluation; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.attribute.*; |
| import proguard.classfile.attribute.visitor.*; |
| import proguard.classfile.constant.*; |
| import proguard.classfile.editor.*; |
| import proguard.classfile.instruction.*; |
| import proguard.classfile.instruction.visitor.InstructionVisitor; |
| import proguard.classfile.util.SimplifiedVisitor; |
| import proguard.classfile.visitor.*; |
| import proguard.optimize.info.SimpleEnumMarker; |
| import proguard.optimize.peephole.*; |
| |
| /** |
| * This ClassVisitor simplifies the classes that it visits to simple enums. |
| * |
| * @see SimpleEnumMarker |
| * @see MemberReferenceFixer |
| * @author Eric Lafortune |
| */ |
| public class SimpleEnumClassSimplifier |
| extends SimplifiedVisitor |
| implements ClassVisitor, |
| AttributeVisitor, |
| InstructionVisitor |
| { |
| //* |
| private static final boolean DEBUG = false; |
| /*/ |
| private static boolean DEBUG = System.getProperty("enum") != null; |
| //*/ |
| |
| |
| private static final int ENUM_CLASS_NAME = InstructionSequenceReplacer.A; |
| private static final int ENUM_TYPE_NAME = InstructionSequenceReplacer.B; |
| private static final int ENUM_CONSTANT_NAME = InstructionSequenceReplacer.X; |
| private static final int ENUM_CONSTANT_ORDINAL = InstructionSequenceReplacer.Y; |
| private static final int ENUM_CONSTANT_FIELD_NAME = InstructionSequenceReplacer.Z; |
| |
| private static final int STRING_ENUM_CONSTANT_NAME = 0; |
| |
| private static final int METHOD_ENUM_INIT = 1; |
| private static final int FIELD_ENUM_CONSTANT = 2; |
| |
| private static final int CLASS_ENUM = 3; |
| |
| private static final int NAME_AND_TYPE_ENUM_INIT = 4; |
| private static final int NAME_AND_TYPE_ENUM_CONSTANT = 5; |
| |
| private static final int UTF8_INIT = 6; |
| private static final int UTF8_STRING_I = 7; |
| |
| |
| private static final Constant[] CONSTANTS = new Constant[] |
| { |
| new StringConstant(ENUM_CONSTANT_NAME, null, null), |
| |
| new MethodrefConstant(CLASS_ENUM, NAME_AND_TYPE_ENUM_INIT, null, null), |
| new FieldrefConstant( CLASS_ENUM, NAME_AND_TYPE_ENUM_CONSTANT, null, null), |
| |
| new ClassConstant(ENUM_CLASS_NAME, null), |
| |
| new NameAndTypeConstant(UTF8_INIT, UTF8_STRING_I), |
| new NameAndTypeConstant(ENUM_CONSTANT_FIELD_NAME, ENUM_TYPE_NAME), |
| |
| new Utf8Constant(ClassConstants.METHOD_NAME_INIT), |
| new Utf8Constant(ClassConstants.METHOD_TYPE_INIT_ENUM), |
| }; |
| |
| private static final Instruction[] INSTRUCTIONS = new Instruction[] |
| { |
| new ConstantInstruction(InstructionConstants.OP_NEW, CLASS_ENUM), |
| new SimpleInstruction(InstructionConstants.OP_DUP), |
| new ConstantInstruction(InstructionConstants.OP_LDC, STRING_ENUM_CONSTANT_NAME), |
| new SimpleInstruction(InstructionConstants.OP_ICONST_0, ENUM_CONSTANT_ORDINAL), |
| new ConstantInstruction(InstructionConstants.OP_INVOKESPECIAL, METHOD_ENUM_INIT), |
| }; |
| |
| private static final Instruction[] REPLACEMENT_INSTRUCTIONS = new Instruction[] |
| { |
| new SimpleInstruction(InstructionConstants.OP_SIPUSH, ENUM_CONSTANT_ORDINAL), |
| new SimpleInstruction(InstructionConstants.OP_ICONST_1), |
| new SimpleInstruction(InstructionConstants.OP_IADD), |
| }; |
| |
| |
| private final CodeAttributeEditor codeAttributeEditor = |
| new CodeAttributeEditor(true, true); |
| |
| private final InstructionSequenceReplacer instructionSequenceReplacer = |
| new InstructionSequenceReplacer(CONSTANTS, |
| INSTRUCTIONS, |
| REPLACEMENT_INSTRUCTIONS, |
| null, |
| codeAttributeEditor); |
| |
| private final MemberVisitor initializerSimplifier = new AllAttributeVisitor(this); |
| |
| |
| // Implementations for ClassVisitor. |
| |
| public void visitProgramClass(ProgramClass programClass) |
| { |
| if (DEBUG) |
| { |
| System.out.println("SimpleEnumClassSimplifier: ["+programClass.getName()+"]"); |
| } |
| |
| // Unmark the class as an enum. |
| programClass.u2accessFlags &= ~ClassConstants.ACC_ENUM; |
| |
| // Remove the valueOf method, if present. |
| Method valueOfMethod = |
| programClass.findMethod(ClassConstants.METHOD_NAME_VALUEOF, null); |
| if (valueOfMethod != null) |
| { |
| new ClassEditor(programClass).removeMethod(valueOfMethod); |
| } |
| |
| // Simplify the static initializer. |
| programClass.methodAccept(ClassConstants.METHOD_NAME_CLINIT, |
| ClassConstants.METHOD_TYPE_CLINIT, |
| initializerSimplifier); |
| } |
| |
| |
| // Implementations for AttributeVisitor. |
| |
| public void visitAnyAttribute(Clazz clazz, Attribute attribute) {} |
| |
| |
| public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute) |
| { |
| // Set up the code attribute editor. |
| codeAttributeEditor.reset(codeAttribute.u4codeLength); |
| |
| // Find the peephole changes. |
| codeAttribute.instructionsAccept(clazz, method, instructionSequenceReplacer); |
| |
| // Apply the peephole changes. |
| codeAttributeEditor.visitCodeAttribute(clazz, method, codeAttribute); |
| } |
| } |