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 whether the methods whose instructions it 34 * visits contain the invokedynamic instruction. 35 * 36 * @author Eric Lafortune 37 */ 38 public class DynamicInvocationMarker 39 extends SimplifiedVisitor 40 implements InstructionVisitor, 41 ConstantVisitor, 42 ClassVisitor, 43 MemberVisitor 44 { 45 // Implementations for InstructionVisitor. 46 visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction)47 public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {} 48 49 visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction)50 public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction) 51 { 52 if (constantInstruction.opcode == InstructionConstants.OP_INVOKEDYNAMIC) 53 { 54 setInvokesDynamically(method); 55 } 56 } 57 58 59 // Small utility methods. 60 setInvokesDynamically(Method method)61 private static void setInvokesDynamically(Method method) 62 { 63 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 64 if (info != null) 65 { 66 info.setInvokesDynamically(); 67 } 68 } 69 70 71 /** 72 * Returns whether the given method calls the invokedynamic instruction. 73 */ invokesDynamically(Method method)74 public static boolean invokesDynamically(Method method) 75 { 76 MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method); 77 return info == null || info.invokesDynamically(); 78 } 79 } 80