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.classfile.attribute.preverification; 22 23 import proguard.classfile.*; 24 import proguard.classfile.attribute.CodeAttribute; 25 import proguard.classfile.attribute.preverification.visitor.*; 26 27 /** 28 * This StackMapFrame represents a "same locals 1 stack item frame" or a 29 * "same locals 1 stack item frame extended". 30 * 31 * @author Eric Lafortune 32 */ 33 public class SameOneFrame extends StackMapFrame 34 { 35 public VerificationType stackItem; 36 37 38 /** 39 * Creates an uninitialized SameOneFrame. 40 */ SameOneFrame()41 public SameOneFrame() 42 { 43 } 44 45 46 /** 47 * Creates a SameOneFrame with the given tag. 48 */ SameOneFrame(int tag)49 public SameOneFrame(int tag) 50 { 51 u2offsetDelta = tag - SAME_ONE_FRAME; 52 } 53 54 55 /** 56 * Creates a SameOneFrame with the given stack verification type. 57 */ SameOneFrame(VerificationType stackItem)58 public SameOneFrame(VerificationType stackItem) 59 { 60 this.stackItem = stackItem; 61 } 62 63 64 /** 65 * Applies the given verification type visitor to the stack item. 66 */ stackItemAccept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, VerificationTypeVisitor verificationTypeVisitor)67 public void stackItemAccept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, VerificationTypeVisitor verificationTypeVisitor) 68 { 69 stackItem.accept(clazz, method, codeAttribute, offset, verificationTypeVisitor); 70 } 71 72 73 // Implementations for StackMapFrame. 74 getTag()75 public int getTag() 76 { 77 return u2offsetDelta < 64 ? 78 SAME_ONE_FRAME + u2offsetDelta : 79 SAME_ONE_FRAME_EXTENDED; 80 } 81 82 accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, StackMapFrameVisitor stackMapFrameVisitor)83 public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, StackMapFrameVisitor stackMapFrameVisitor) 84 { 85 stackMapFrameVisitor.visitSameOneFrame(clazz, method, codeAttribute, offset, this); 86 } 87 88 89 // Implementations for Object. 90 equals(Object object)91 public boolean equals(Object object) 92 { 93 if (!super.equals(object)) 94 { 95 return false; 96 } 97 98 SameOneFrame other = (SameOneFrame)object; 99 100 return this.u2offsetDelta == other.u2offsetDelta && 101 this.stackItem.equals(other.stackItem); 102 } 103 104 hashCode()105 public int hashCode() 106 { 107 return super.hashCode() ^ stackItem.hashCode(); 108 } 109 110 toString()111 public String toString() 112 { 113 return super.toString()+"Var: ..., Stack: ["+stackItem.toString()+"]"; 114 } 115 } 116