/* * ProGuard -- shrinking, optimization, obfuscation, and preverification * of Java bytecode. * * Copyright (c) 2002-2020 Guardsquare NV * * 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.obfuscate.util; import proguard.classfile.*; import proguard.classfile.constant.Constant; import proguard.classfile.editor.*; import proguard.classfile.instruction.Instruction; import proguard.classfile.instruction.visitor.*; import proguard.classfile.util.BranchTargetFinder; import proguard.classfile.visitor.*; import java.util.Arrays; public class InstructionSequenceObfuscator implements ClassVisitor, MemberVisitor { private final PeepholeEditor peepholeEditor; public InstructionSequenceObfuscator(ReplacementSequences replacementSequences) { BranchTargetFinder branchTargetFinder = new BranchTargetFinder(); CodeAttributeEditor codeAttributeEditor = new CodeAttributeEditor(); peepholeEditor = new PeepholeEditor( branchTargetFinder, codeAttributeEditor, new MyInstructionSequenceReplacer( replacementSequences.getConstants(), replacementSequences.getSequences(), branchTargetFinder, codeAttributeEditor )); } // Implementations for ClassVisitor. @Override public void visitAnyClass(Clazz clazz) { } @Override public void visitProgramClass(ProgramClass programClass) { programClass.methodsAccept(this); } // Implementations for MemberVisitor. @Override public void visitAnyMember(Clazz clazz, Member member) { } @Override public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) { programMethod.attributesAccept(programClass, peepholeEditor); } // Helper classes. private static class MyInstructionSequenceReplacer extends MultiInstructionVisitor { MyInstructionSequenceReplacer(Constant[] constants, Instruction[][][] insSequences, BranchTargetFinder branchTargetFinder, CodeAttributeEditor codeAttributeEditor) { super(createInstructionSequenceReplacers(constants, insSequences, branchTargetFinder, codeAttributeEditor)); } private static InstructionVisitor[] createInstructionSequenceReplacers(Constant[] constants, Instruction[][][] insSequences, BranchTargetFinder branchTargetFinder, CodeAttributeEditor codeAttributeEditor) { InstructionVisitor[] isReplacers = new InstructionSequenceReplacer[insSequences.length]; Arrays.setAll( isReplacers, index -> new InstructionSequenceReplacer(constants, insSequences[index][0], constants, insSequences[index][1], branchTargetFinder, codeAttributeEditor, null) ); return isReplacers; } } }