1 /* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu) 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; either version 2 of the License, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 package proguard.optimize.info; 22 23 import proguard.classfile.*; 24 import proguard.classfile.attribute.CodeAttribute; 25 import proguard.classfile.constant.ClassConstant; 26 import proguard.classfile.constant.visitor.ConstantVisitor; 27 import proguard.classfile.instruction.*; 28 import proguard.classfile.instruction.visitor.InstructionVisitor; 29 import proguard.classfile.util.SimplifiedVisitor; 30 import proguard.classfile.visitor.ClassVisitor; 31 32 /** 33 * This InstructionVisitor marks all classes that are instantiated by any of 34 * the instructions that it visits. 35 * 36 * @author Eric Lafortune 37 */ 38 public class InstantiationClassMarker 39 extends SimplifiedVisitor 40 implements InstructionVisitor, 41 ConstantVisitor, 42 ClassVisitor 43 { 44 // Implementations for InstructionVisitor. 45 visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction)46 public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {} 47 48 visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction)49 public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction) 50 { 51 if (constantInstruction.opcode == InstructionConstants.OP_NEW) 52 { 53 clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this); 54 } 55 } 56 57 58 // Implementations for ConstantVisitor. 59 visitClassConstant(Clazz clazz, ClassConstant classConstant)60 public void visitClassConstant(Clazz clazz, ClassConstant classConstant) 61 { 62 classConstant.referencedClassAccept(this); 63 } 64 65 66 // Implementations for ClassVisitor. 67 visitLibraryClass(LibraryClass libraryClass)68 public void visitLibraryClass(LibraryClass libraryClass) {} 69 visitProgramClass(ProgramClass programClass)70 public void visitProgramClass(ProgramClass programClass) 71 { 72 setInstantiated(programClass); 73 } 74 75 76 // Small utility methods. 77 setInstantiated(Clazz clazz)78 private static void setInstantiated(Clazz clazz) 79 { 80 ClassOptimizationInfo info = ClassOptimizationInfo.getClassOptimizationInfo(clazz); 81 if (info != null) 82 { 83 info.setInstantiated(); 84 } 85 } 86 87 isInstantiated(Clazz clazz)88 public static boolean isInstantiated(Clazz clazz) 89 { 90 ClassOptimizationInfo info = ClassOptimizationInfo.getClassOptimizationInfo(clazz); 91 return info == null || info.isInstantiated(); 92 } 93 }