1/* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5/* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21package com.sun.org.apache.bcel.internal.generic; 22 23import com.sun.org.apache.bcel.internal.Const; 24import com.sun.org.apache.bcel.internal.ExceptionConst; 25 26/** 27 * GETFIELD - Fetch field from object 28 * <PRE>Stack: ..., objectref -> ..., value</PRE> OR 29 * <PRE>Stack: ..., objectref -> ..., value.word1, value.word2</PRE> 30 * 31 * @version $Id: GETFIELD.java 1747278 2016-06-07 17:28:43Z britter $ 32 */ 33public class GETFIELD extends FieldInstruction implements ExceptionThrower, StackConsumer, 34 StackProducer { 35 36 /** 37 * Empty constructor needed for the Class.newInstance() statement in 38 * Instruction.readInstruction(). Not to be used otherwise. 39 */ 40 GETFIELD() { 41 } 42 43 public GETFIELD(final int index) { 44 super(Const.GETFIELD, index); 45 } 46 47 @Override 48 public int produceStack(final ConstantPoolGen cpg) { 49 return getFieldSize(cpg); 50 } 51 52 @Override 53 public Class<?>[] getExceptions() { 54 return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_FIELD_AND_METHOD_RESOLUTION, 55 ExceptionConst.NULL_POINTER_EXCEPTION, 56 ExceptionConst.INCOMPATIBLE_CLASS_CHANGE_ERROR); 57 } 58 59 /** 60 * Call corresponding visitor method(s). The order is: Call visitor methods 61 * of implemented interfaces first, then call methods according to the class 62 * hierarchy in descending order, i.e., the most specific visitXXX() call 63 * comes last. 64 * 65 * @param v Visitor object 66 */ 67 @Override 68 public void accept(final Visitor v) { 69 v.visitExceptionThrower(this); 70 v.visitStackConsumer(this); 71 v.visitStackProducer(this); 72 v.visitTypedInstruction(this); 73 v.visitLoadClass(this); 74 v.visitCPInstruction(this); 75 v.visitFieldOrMethod(this); 76 v.visitFieldInstruction(this); 77 v.visitGETFIELD(this); 78 } 79} 80