| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.sun.org.apache.bcel.internal.generic; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| import com.sun.org.apache.bcel.internal.util.ByteSequence; |
| |
| /** |
| * IINC - Increment local variable by constant |
| * |
| */ |
| public class IINC extends LocalVariableInstruction { |
| |
| private boolean wide; |
| private int c; |
| |
| |
| /** |
| * Empty constructor needed for Instruction.readInstruction. |
| * Not to be used otherwise. |
| */ |
| IINC() { |
| } |
| |
| |
| /** |
| * @param n index of local variable |
| * @param c increment factor |
| */ |
| public IINC(final int n, final int c) { |
| super(); // Default behavior of LocalVariableInstruction causes error |
| super.setOpcode(com.sun.org.apache.bcel.internal.Const.IINC); |
| super.setLength((short) 3); |
| setIndex(n); // May set wide as side effect |
| setIncrement(c); |
| } |
| |
| |
| /** |
| * Dump instruction as byte code to stream out. |
| * @param out Output stream |
| */ |
| @Override |
| public void dump( final DataOutputStream out ) throws IOException { |
| if (wide) { |
| out.writeByte(com.sun.org.apache.bcel.internal.Const.WIDE); |
| } |
| out.writeByte(super.getOpcode()); |
| if (wide) { |
| out.writeShort(super.getIndex()); |
| out.writeShort(c); |
| } else { |
| out.writeByte(super.getIndex()); |
| out.writeByte(c); |
| } |
| } |
| |
| |
| private void setWide() { |
| wide = super.getIndex() > com.sun.org.apache.bcel.internal.Const.MAX_BYTE; |
| if (c > 0) { |
| wide = wide || (c > Byte.MAX_VALUE); |
| } else { |
| wide = wide || (c < Byte.MIN_VALUE); |
| } |
| if (wide) { |
| super.setLength(6); // wide byte included |
| } else { |
| super.setLength(3); |
| } |
| } |
| |
| |
| /** |
| * Read needed data (e.g. index) from file. |
| */ |
| @Override |
| protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException { |
| this.wide = wide; |
| if (wide) { |
| super.setLength(6); |
| super.setIndexOnly(bytes.readUnsignedShort()); |
| c = bytes.readShort(); |
| } else { |
| super.setLength(3); |
| super.setIndexOnly(bytes.readUnsignedByte()); |
| c = bytes.readByte(); |
| } |
| } |
| |
| |
| /** |
| * @return mnemonic for instruction |
| */ |
| @Override |
| public String toString( final boolean verbose ) { |
| return super.toString(verbose) + " " + c; |
| } |
| |
| |
| /** |
| * Set index of local variable. |
| */ |
| @Override |
| public final void setIndex( final int n ) { |
| if (n < 0) { |
| throw new ClassGenException("Negative index value: " + n); |
| } |
| super.setIndexOnly(n); |
| setWide(); |
| } |
| |
| |
| /** |
| * @return increment factor |
| */ |
| public final int getIncrement() { |
| return c; |
| } |
| |
| |
| /** |
| * Set increment factor. |
| */ |
| public final void setIncrement( final int c ) { |
| this.c = c; |
| setWide(); |
| } |
| |
| |
| /** @return int type |
| */ |
| @Override |
| public Type getType( final ConstantPoolGen cp ) { |
| return Type.INT; |
| } |
| |
| |
| /** |
| * Call corresponding visitor method(s). The order is: |
| * Call visitor methods of implemented interfaces first, then |
| * call methods according to the class hierarchy in descending order, |
| * i.e., the most specific visitXXX() call comes last. |
| * |
| * @param v Visitor object |
| */ |
| @Override |
| public void accept( final Visitor v ) { |
| v.visitLocalVariableInstruction(this); |
| v.visitIINC(this); |
| } |
| } |