1b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/* 2b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * ProGuard -- shrinking, optimization, obfuscation, and preverification 3b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * of Java bytecode. 4b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 5b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu) 6b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 7b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This program is free software; you can redistribute it and/or modify it 8b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * under the terms of the GNU General Public License as published by the Free 9b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Software Foundation; either version 2 of the License, or (at your option) 10b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * any later version. 11b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 12b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * This program is distributed in the hope that it will be useful, but WITHOUT 13b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * more details. 16b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 17b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * You should have received a copy of the GNU General Public License along 18b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * with this program; if not, write to the Free Software Foundation, Inc., 19b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 21b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopackage proguard.classfile.util; 22b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 23b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.*; 24b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport proguard.classfile.visitor.*; 25b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 26b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimport java.util.*; 27b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 28b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato/** 29b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * This ClassVisitor links all corresponding non-private, non-static, 30b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * non-initializer methods in the class hierarchies of all visited classes. 31b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Visited classes are typically all class files that are not being subclassed. 32b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Chains of links that have been created in previous invocations are merged 33b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * with new chains of links, in order to create a consistent set of chains. 34b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * 35b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @author Eric Lafortune 36b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 37b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratopublic class MethodLinker 38b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoextends SimplifiedVisitor 39b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onoratoimplements ClassVisitor, 40b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato MemberVisitor 41b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato{ 42b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // An object that is reset and reused every time. 43b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // The map: [class member name+' '+descriptor - class member info] 44b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private final Map memberMap = new HashMap(); 45b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 46b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 47b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Implementations for ClassVisitor. 48b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 49b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void visitAnyClass(Clazz clazz) 50b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 51b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Collect all non-private members in this class hierarchy. 52b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato clazz.hierarchyAccept(true, true, true, false, 53b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato new AllMethodVisitor( 54b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang new MemberAccessFilter(0, ClassConstants.INTERNAL_ACC_PRIVATE | ClassConstants.INTERNAL_ACC_STATIC, 55b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato this))); 56b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 57b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Clean up for the next class hierarchy. 58b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato memberMap.clear(); 59b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 60b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 61b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 62b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Implementations for MemberVisitor. 63b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 64b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public void visitAnyMember(Clazz clazz, Member member) 65b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 66b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Get the class member's name and descriptor. 67b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato String name = member.getName(clazz); 68b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato String descriptor = member.getDescriptor(clazz); 69b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 70b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Special cases: <clinit> and <init> are always kept unchanged. 71b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // We can ignore them here. 72b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (name.equals(ClassConstants.INTERNAL_METHOD_NAME_CLINIT) || 73b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato name.equals(ClassConstants.INTERNAL_METHOD_NAME_INIT)) 74b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 75b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return; 76b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 77b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 78b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // See if we've already come across a method with the same name and 79b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // descriptor. 80b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato String key = name + ' ' + descriptor; 81b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Member otherMember = (Member)memberMap.get(key); 82b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 83b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (otherMember == null) 84b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 85b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Get the last method in the chain. 86b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Member thisLastMember = lastMember(member); 87b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 88b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Store the new class method in the map. 89b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato memberMap.put(key, thisLastMember); 90b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 91b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato else 92b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 93b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Link both members. 94b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato link(member, otherMember); 95b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 96b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 97b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 98b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 99b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Small utility methods. 100b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 101b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 102b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Links the two given class members. 103b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 104b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato private static void link(Member member1, Member member2) 105b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 106b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Get the last methods in the both chains. 107b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Member lastMember1 = lastMember(member1); 108b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Member lastMember2 = lastMember(member2); 109b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 110b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Check if both link chains aren't already ending in the same element. 111b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (!lastMember1.equals(lastMember2)) 112b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 113b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato // Merge the two chains, with the library members last. 114b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato if (lastMember2 instanceof LibraryMember) 115b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 116b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato lastMember1.setVisitorInfo(lastMember2); 117b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 118b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato else 119b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 120b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato lastMember2.setVisitorInfo(lastMember1); 121b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 122b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 123b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 124b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 125b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 126b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 127b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Finds the last class member in the linked list of related class members. 128b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param member the given class member. 129b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @return the last class member in the linked list. 130b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 131b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public static Member lastMember(Member member) 132b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 133b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato Member lastMember = member; 134b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato while (lastMember.getVisitorInfo() != null && 135b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato lastMember.getVisitorInfo() instanceof Member) 136b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 137b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato lastMember = (Member)lastMember.getVisitorInfo(); 138b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 139b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 140b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return lastMember; 141b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 142b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 143b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 144b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato /** 145b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * Finds the last visitor accepter in the linked list of visitors. 146b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @param visitorAccepter the given method. 147b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato * @return the last method in the linked list. 148b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato */ 149b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato public static VisitorAccepter lastVisitorAccepter(VisitorAccepter visitorAccepter) 150b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 151b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato VisitorAccepter lastVisitorAccepter = visitorAccepter; 152b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato while (lastVisitorAccepter.getVisitorInfo() != null && 153b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato lastVisitorAccepter.getVisitorInfo() instanceof VisitorAccepter) 154b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato { 155b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato lastVisitorAccepter = (VisitorAccepter)lastVisitorAccepter.getVisitorInfo(); 156b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 157b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato 158b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato return lastVisitorAccepter; 159b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato } 160b72c5c2e5482cf10117b2b25f642f7616b2326c3Joe Onorato} 161