001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * https://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.commons.compress.harmony.unpack200.bytecode.forms; 020 021import org.apache.commons.compress.harmony.pack200.Pack200Exception; 022import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool; 023import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode; 024import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry; 025import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager; 026 027/** 028 * This class implements the byte code form for those bytecodes which have class references (and only class references). 029 */ 030public class ClassRefForm extends ReferenceForm { 031 032 protected boolean widened; 033 034 /** 035 * Constructs a new instance with the specified opcode, name, operandType and rewrite. 036 * 037 * @param opcode index corresponding to the opcode's value. 038 * @param name String printable name of the opcode. 039 * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1. 040 */ 041 public ClassRefForm(final int opcode, final String name, final int[] rewrite) { 042 super(opcode, name, rewrite); 043 } 044 045 /** 046 * Constructs a new instance with the specified opcode, name, operandType and rewrite. 047 * 048 * @param opcode index corresponding to the opcode's value. 049 * @param name String printable name of the opcode. 050 * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1. 051 * @param widened TODO. 052 */ 053 public ClassRefForm(final int opcode, final String name, final int[] rewrite, final boolean widened) { 054 this(opcode, name, rewrite); 055 this.widened = widened; 056 } 057 058 @Override 059 protected int getOffset(final OperandManager operandManager) { 060 return operandManager.nextClassRef(); 061 } 062 063 @Override 064 protected int getPoolID() { 065 return SegmentConstantPool.CP_CLASS; 066 } 067 068 @Override 069 protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception { 070 // If the offset is not zero, proceed normally. 071 if (offset != 0) { 072 super.setNestedEntries(byteCode, operandManager, offset - 1); 073 return; 074 } 075 // If the offset is 0, ClassRefForms refer to 076 // the current class. Add that as the nested class. 077 // (This is true for all bc_classref forms in 078 // the spec except for multianewarray, which has 079 // its own form.) 080 final SegmentConstantPool globalPool = operandManager.globalConstantPool(); 081 // How do I get this class? 082 final ClassFileEntry[] nested = { globalPool.getClassPoolEntry(operandManager.getCurrentClass()) }; 083 byteCode.setNested(nested); 084 byteCode.setNestedPositions(new int[][] { { 0, 2 } }); 085 } 086}