1/* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2009 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 */ 21package proguard.optimize.info; 22 23import proguard.classfile.*; 24import proguard.classfile.attribute.CodeAttribute; 25import proguard.classfile.constant.*; 26import proguard.classfile.constant.visitor.ConstantVisitor; 27import proguard.classfile.instruction.*; 28import proguard.classfile.instruction.visitor.InstructionVisitor; 29import proguard.classfile.util.SimplifiedVisitor; 30import proguard.classfile.visitor.*; 31 32/** 33 * This InstructionVisitor marks the types of class accesses and class member 34 * accesses of the methods whose instructions it visits. 35 * 36 * @author Eric Lafortune 37 */ 38public class AccessMethodMarker 39extends SimplifiedVisitor 40implements InstructionVisitor, 41 ConstantVisitor, 42 ClassVisitor, 43 MemberVisitor 44{ 45 private Method invokingMethod; 46 47 48 // Implementations for InstructionVisitor. 49 50 public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {} 51 52 53 public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction) 54 { 55 invokingMethod = method; 56 57 clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this); 58 } 59 60 61 // Implementations for ConstantVisitor. 62 63 public void visitAnyConstant(Clazz clazz, Constant constant) {} 64 65 66 public void visitStringConstant(Clazz clazz, StringConstant stringConstant) 67 { 68 // Check the referenced class or class member, if any. 69 stringConstant.referencedClassAccept(this); 70 stringConstant.referencedMemberAccept(this); 71 } 72 73 74 public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant) 75 { 76 // Check the referenced class. 77 clazz.constantPoolEntryAccept(refConstant.u2classIndex, this); 78 79 // Check the referenced class member itself. 80 refConstant.referencedClassAccept(this); 81 refConstant.referencedMemberAccept(this); 82 } 83 84 85 public void visitClassConstant(Clazz clazz, ClassConstant classConstant) 86 { 87 // Check the referenced class. 88 classConstant.referencedClassAccept(this); 89 } 90 91 92 // Implementations for ClassVisitor. 93 94 public void visitAnyClass(Clazz clazz) 95 { 96 int accessFlags = clazz.getAccessFlags(); 97 98 if ((accessFlags & ClassConstants.INTERNAL_ACC_PUBLIC) == 0) 99 { 100 setAccessesPackageCode(invokingMethod); 101 } 102 } 103 104 105 // Implementations for MemberVisitor. 106 107 public void visitAnyMember(Clazz clazz, Member member) 108 { 109 int accessFlags = member.getAccessFlags(); 110 111 if ((accessFlags & ClassConstants.INTERNAL_ACC_PRIVATE) != 0) 112 { 113 setAccessesPrivateCode(invokingMethod); 114 } 115 else if ((accessFlags & ClassConstants.INTERNAL_ACC_PROTECTED) != 0) 116 { 117 setAccessesProtectedCode(invokingMethod); 118 } 119 else if ((accessFlags & ClassConstants.INTERNAL_ACC_PUBLIC) == 0) 120 { 121 setAccessesPackageCode(invokingMethod); 122 } 123 } 124 125 126 // Small utility methods. 127 128 private static void setAccessesPrivateCode(Method method) 129 { 130 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 131 if (info != null) 132 { 133 info.setAccessesPrivateCode(); 134 } 135 } 136 137 138 /** 139 * Returns whether the given method accesses private class members. 140 */ 141 public static boolean accessesPrivateCode(Method method) 142 { 143 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 144 return info == null || info.accessesPrivateCode(); 145 } 146 147 148 private static void setAccessesPackageCode(Method method) 149 { 150 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 151 if (info != null) 152 { 153 info.setAccessesPackageCode(); 154 } 155 } 156 157 158 /** 159 * Returns whether the given method accesses package visible classes or class 160 * members. 161 */ 162 public static boolean accessesPackageCode(Method method) 163 { 164 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 165 return info == null || info.accessesPackageCode(); 166 } 167 168 169 private static void setAccessesProtectedCode(Method method) 170 { 171 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 172 if (info != null) 173 { 174 info.setAccessesProtectedCode(); 175 } 176 } 177 178 179 /** 180 * Returns whether the given method accesses protected class members. 181 */ 182 public static boolean accessesProtectedCode(Method method) 183 { 184 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 185 return info == null || info.accessesProtectedCode(); 186 } 187} 188