001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.compress.harmony.unpack200.bytecode.forms; 018 019import org.apache.commons.compress.harmony.pack200.Pack200Exception; 020import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool; 021import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode; 022import org.apache.commons.compress.harmony.unpack200.bytecode.CPClass; 023import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry; 024import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager; 025 026/** 027 * 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. 028 * To allow the sender to create instances of either a specified class (which then becomes the new class) or the last used new class. 029 */ 030public class NewClassRefForm extends ClassRefForm { 031 032 public NewClassRefForm(final int opcode, final String name, final int[] rewrite) { 033 super(opcode, name, rewrite); 034 } 035 036 /* 037 * (non-Javadoc) 038 * 039 * @see org.apache.commons.compress.harmony.unpack200.bytecode.forms.ReferenceForm#setByteCodeOperands(org.apache.commons 040 * .compress.harmony.unpack200.bytecode.ByteCode, org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager) 041 */ 042 @Override 043 public void setByteCodeOperands(final ByteCode byteCode, final OperandManager operandManager, final int codeLength) { 044 final int offset = getOffset(operandManager); 045 if (offset == 0) { 046 // Use current class 047 final SegmentConstantPool globalPool = operandManager.globalConstantPool(); 048 final ClassFileEntry[] nested = { globalPool.getClassPoolEntry(operandManager.getCurrentClass()) }; 049 byteCode.setNested(nested); 050 byteCode.setNestedPositions(new int[][] { { 0, 2 } }); 051 } else { 052 // Look up the class in the classpool 053 try { 054 // Parent takes care of subtracting one from offset 055 // to adjust for 1-based global pool 056 setNestedEntries(byteCode, operandManager, offset); 057 } catch (final Pack200Exception ex) { 058 throw new Error("Got a pack200 exception. What to do?"); 059 } 060 } 061 operandManager.setNewClass(((CPClass) byteCode.getNestedClassFileEntries()[0]).getName()); 062 } 063}