- package com.sun.org.apache.bcel.internal.generic;
-
- /* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2001 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Apache" and "Apache Software Foundation" and
- * "Apache BCEL" must not be used to endorse or promote products
- * derived from this software without prior written permission. For
- * written permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * "Apache BCEL", nor may "Apache" appear in their name, without
- * prior written permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- import java.io.*;
- import com.sun.org.apache.bcel.internal.util.ByteSequence;
-
- /**
- * RET - Return from subroutine
- *
- * <PRE>Stack: ..., -> ..., address</PRE>
- *
- * @version $Id: RET.java,v 1.1.1.1 2001/10/29 20:00:25 jvanzyl Exp $
- * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
- */
- public class RET extends Instruction implements IndexedInstruction, TypedInstruction {
- private boolean wide;
- private int index; // index to local variable containg the return address
-
- /**
- * Empty constructor needed for the Class.newInstance() statement in
- * Instruction.readInstruction(). Not to be used otherwise.
- */
- RET() {}
-
- public RET(int index) {
- super(com.sun.org.apache.bcel.internal.Constants.RET, (short)2);
- setIndex(index); // May set wide as side effect
- }
-
- /**
- * Dump instruction as byte code to stream out.
- * @param out Output stream
- */
- public void dump(DataOutputStream out) throws IOException {
- if(wide)
- out.writeByte(com.sun.org.apache.bcel.internal.Constants.WIDE);
-
- out.writeByte(opcode);
-
- if(wide)
- out.writeShort(index);
- else
- out.writeByte(index);
- }
-
- private final void setWide() {
- if(wide = index > com.sun.org.apache.bcel.internal.Constants.MAX_BYTE)
- length = 4; // Including the wide byte
- else
- length = 2;
- }
-
- /**
- * Read needed data (e.g. index) from file.
- */
- protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
- {
- this.wide = wide;
-
- if(wide) {
- index = bytes.readUnsignedShort();
- length = 4;
- } else {
- index = bytes.readUnsignedByte();
- length = 2;
- }
- }
-
- /**
- * @return index of local variable containg the return address
- */
- public final int getIndex() { return index; }
-
- /**
- * Set index of local variable containg the return address
- */
- public final void setIndex(int n) {
- if(n < 0)
- throw new ClassGenException("Negative index value: " + n);
-
- index = n;
- setWide();
- }
-
- /**
- * @return mnemonic for instruction
- */
- public String toString(boolean verbose) {
- return super.toString(verbose) + " " + index;
- }
-
- /** @return return address type
- */
- public Type getType(ConstantPoolGen cp) {
- return ReturnaddressType.NO_TARGET;
- }
-
- /**
- * 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
- */
- public void accept(Visitor v) {
- v.visitRET(this);
- }
- }