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.CPInterfaceMethodRef;
025import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
026
027/**
028 * This class implements the byte code form for those bytecodes which have IMethod references (and only IMethod references).
029 */
030public class IMethodRefForm extends ReferenceForm {
031
032    /**
033     * Constructs a new instance with the specified opcode, name, operandType and rewrite.
034     *
035     * @param opcode  index corresponding to the opcode's value.
036     * @param name    String printable name of the opcode.
037     * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
038     */
039    public IMethodRefForm(final int opcode, final String name, final int[] rewrite) {
040        super(opcode, name, rewrite);
041    }
042
043    @Override
044    protected int getOffset(final OperandManager operandManager) {
045        return operandManager.nextIMethodRef();
046    }
047
048    @Override
049    protected int getPoolID() {
050        return SegmentConstantPool.CP_IMETHOD;
051    }
052
053    /*
054     * (non-Javadoc)
055     *
056     * @see org.apache.commons.compress.harmony.unpack200.bytecode.forms.ByteCodeForm#setByteCodeOperands(org.apache.commons.
057     * compress.harmony.unpack200.bytecode.ByteCode, org.apache.commons.compress.harmony.unpack200.bytecode.OperandTable,
058     * org.apache.commons.compress.harmony.unpack200.Segment)
059     */
060    @Override
061    public void setByteCodeOperands(final ByteCode byteCode, final OperandManager operandManager, final int codeLength) throws Pack200Exception {
062        super.setByteCodeOperands(byteCode, operandManager, codeLength);
063        final int count = ((CPInterfaceMethodRef) byteCode.getNestedClassFileEntries()[0]).invokeInterfaceCount();
064        byteCode.getRewrite()[3] = count;
065    }
066}