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.CPClass; 025import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry; 026import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager; 027 028/** 029 * This class is an extension of the ClassRefForm. It has two purposes: 1. To keep track of the last type used in a new() instruction in the current class. 2. 030 * To allow the sender to create instances of either a specified class (which then becomes the new class) or the last used new class. 031 */ 032public class NewClassRefForm extends ClassRefForm { 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 NewClassRefForm(final int opcode, final String name, final int[] rewrite) { 042 super(opcode, name, rewrite); 043 } 044 045 /* 046 * (non-Javadoc) 047 * 048 * @see org.apache.commons.compress.harmony.unpack200.bytecode.forms.ReferenceForm#setByteCodeOperands(org.apache.commons 049 * .compress.harmony.unpack200.bytecode.ByteCode, org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager) 050 */ 051 @Override 052 public void setByteCodeOperands(final ByteCode byteCode, final OperandManager operandManager, final int codeLength) throws Pack200Exception { 053 final int offset = getOffset(operandManager); 054 if (offset == 0) { 055 // Use current class 056 final SegmentConstantPool globalPool = operandManager.globalConstantPool(); 057 final ClassFileEntry[] nested = { globalPool.getClassPoolEntry(operandManager.getCurrentClass()) }; 058 byteCode.setNested(nested); 059 byteCode.setNestedPositions(new int[][] { { 0, 2 } }); 060 } else { 061 // Look up the class in the classpool 062 try { 063 // Parent takes care of subtracting one from offset 064 // to adjust for 1-based global pool 065 setNestedEntries(byteCode, operandManager, offset); 066 } catch (final Pack200Exception ex) { 067 throw new Error("Got a pack200 exception. What to do?"); 068 } 069 } 070 operandManager.setNewClass(((CPClass) byteCode.getNestedClassFileEntries()[0]).getName()); 071 } 072}