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.*; 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.*; 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 */ 38 public class AccessMethodMarker 39 extends SimplifiedVisitor 40 implements InstructionVisitor, 41 ConstantVisitor, 42 ClassVisitor, 43 MemberVisitor 44 { 45 private Method invokingMethod; 46 47 48 // Implementations for InstructionVisitor. 49 visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction)50 public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {} 51 52 visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction)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 visitAnyConstant(Clazz clazz, Constant constant)63 public void visitAnyConstant(Clazz clazz, Constant constant) {} 64 65 visitStringConstant(Clazz clazz, StringConstant stringConstant)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 visitInvokeDynamicConstant(Clazz clazz, InvokeDynamicConstant invokeDynamicConstant)74 public void visitInvokeDynamicConstant(Clazz clazz, InvokeDynamicConstant invokeDynamicConstant) 75 { 76 // Check the bootstrap method. 77 invokeDynamicConstant.bootstrapMethodHandleAccept(clazz, this); 78 } 79 80 visitMethodHandleConstant(Clazz clazz, MethodHandleConstant methodHandleConstant)81 public void visitMethodHandleConstant(Clazz clazz, MethodHandleConstant methodHandleConstant) 82 { 83 // Check the method reference. 84 clazz.constantPoolEntryAccept(methodHandleConstant.u2referenceIndex, this); 85 } 86 87 visitAnyRefConstant(Clazz clazz, RefConstant refConstant)88 public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant) 89 { 90 // Check the referenced class. 91 clazz.constantPoolEntryAccept(refConstant.u2classIndex, this); 92 93 // Check the referenced class member itself. 94 refConstant.referencedClassAccept(this); 95 refConstant.referencedMemberAccept(this); 96 } 97 98 visitClassConstant(Clazz clazz, ClassConstant classConstant)99 public void visitClassConstant(Clazz clazz, ClassConstant classConstant) 100 { 101 // Check the referenced class. 102 classConstant.referencedClassAccept(this); 103 } 104 105 106 // Implementations for ClassVisitor. 107 visitAnyClass(Clazz clazz)108 public void visitAnyClass(Clazz clazz) 109 { 110 int accessFlags = clazz.getAccessFlags(); 111 112 if ((accessFlags & ClassConstants.ACC_PUBLIC) == 0) 113 { 114 setAccessesPackageCode(invokingMethod); 115 } 116 } 117 118 119 // Implementations for MemberVisitor. 120 visitAnyMember(Clazz clazz, Member member)121 public void visitAnyMember(Clazz clazz, Member member) 122 { 123 int accessFlags = member.getAccessFlags(); 124 125 if ((accessFlags & ClassConstants.ACC_PRIVATE) != 0) 126 { 127 setAccessesPrivateCode(invokingMethod); 128 } 129 else if ((accessFlags & ClassConstants.ACC_PROTECTED) != 0) 130 { 131 setAccessesProtectedCode(invokingMethod); 132 } 133 else if ((accessFlags & ClassConstants.ACC_PUBLIC) == 0) 134 { 135 setAccessesPackageCode(invokingMethod); 136 } 137 } 138 139 140 // Small utility methods. 141 setAccessesPrivateCode(Method method)142 private static void setAccessesPrivateCode(Method method) 143 { 144 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 145 if (info != null) 146 { 147 info.setAccessesPrivateCode(); 148 } 149 } 150 151 152 /** 153 * Returns whether the given method accesses private class members. 154 */ accessesPrivateCode(Method method)155 public static boolean accessesPrivateCode(Method method) 156 { 157 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 158 return info == null || info.accessesPrivateCode(); 159 } 160 161 setAccessesPackageCode(Method method)162 private static void setAccessesPackageCode(Method method) 163 { 164 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 165 if (info != null) 166 { 167 info.setAccessesPackageCode(); 168 } 169 } 170 171 172 /** 173 * Returns whether the given method accesses package visible classes or class 174 * members. 175 */ accessesPackageCode(Method method)176 public static boolean accessesPackageCode(Method method) 177 { 178 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 179 return info == null || info.accessesPackageCode(); 180 } 181 182 setAccessesProtectedCode(Method method)183 private static void setAccessesProtectedCode(Method method) 184 { 185 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 186 if (info != null) 187 { 188 info.setAccessesProtectedCode(); 189 } 190 } 191 192 193 /** 194 * Returns whether the given method accesses protected class members. 195 */ accessesProtectedCode(Method method)196 public static boolean accessesProtectedCode(Method method) 197 { 198 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 199 return info == null || info.accessesProtectedCode(); 200 } 201 } 202