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126 lines
4.8 KiB
126 lines
4.8 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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package com.sun.org.apache.bcel.internal.generic;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import java.io.*;
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/**
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* GOTO - Branch always (to relative offset, not absolute address)
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*
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* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
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*/
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public class GOTO extends GotoInstruction implements VariableLengthInstruction {
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/**
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* Empty constructor needed for the Class.newInstance() statement in
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* Instruction.readInstruction(). Not to be used otherwise.
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*/
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GOTO() {}
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public GOTO(InstructionHandle target) {
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super(com.sun.org.apache.bcel.internal.Constants.GOTO, target);
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}
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/**
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* Dump instruction as byte code to stream out.
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* @param out Output stream
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*/
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public void dump(DataOutputStream out) throws IOException {
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index = getTargetOffset();
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if(opcode == com.sun.org.apache.bcel.internal.Constants.GOTO)
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super.dump(out);
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else { // GOTO_W
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index = getTargetOffset();
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out.writeByte(opcode);
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out.writeInt(index);
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}
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}
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/** Called in pass 2 of InstructionList.setPositions() in order to update
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* the branch target, that may shift due to variable length instructions.
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*/
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protected int updatePosition(int offset, int max_offset) {
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int i = getTargetOffset(); // Depending on old position value
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position += offset; // Position may be shifted by preceding expansions
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if(Math.abs(i) >= (32767 - max_offset)) { // to large for short (estimate)
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opcode = com.sun.org.apache.bcel.internal.Constants.GOTO_W;
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length = 5;
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return 2; // 5 - 3
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}
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return 0;
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}
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/**
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* Call corresponding visitor method(s). The order is:
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* Call visitor methods of implemented interfaces first, then
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* call methods according to the class hierarchy in descending order,
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* i.e., the most specific visitXXX() call comes last.
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*
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* @param v Visitor object
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*/
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public void accept(Visitor v) {
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v.visitVariableLengthInstruction(this);
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v.visitUnconditionalBranch(this);
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v.visitBranchInstruction(this);
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v.visitGotoInstruction(this);
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v.visitGOTO(this);
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}
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}
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