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119 lines
4.5 KiB
119 lines
4.5 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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/**
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* Super class for JSR - Jump to subroutine
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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 abstract class JsrInstruction extends BranchInstruction
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implements UnconditionalBranch, TypedInstruction, StackProducer
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{
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JsrInstruction(short opcode, InstructionHandle target) {
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super(opcode, target);
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}
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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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JsrInstruction(){}
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/** @return return address type
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*/
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public Type getType(ConstantPoolGen cp) {
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return new ReturnaddressType(physicalSuccessor());
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}
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/**
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* Returns an InstructionHandle to the physical successor
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* of this JsrInstruction. <B>For this method to work,
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* this JsrInstruction object must not be shared between
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* multiple InstructionHandle objects!</B>
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* Formally, there must not be InstructionHandle objects
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* i, j where i != j and i.getInstruction() == this ==
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* j.getInstruction().
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* @return an InstructionHandle to the "next" instruction that
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* will be executed when RETurned from a subroutine.
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*/
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public InstructionHandle physicalSuccessor(){
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InstructionHandle ih = this.target;
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// Rewind!
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while(ih.getPrev() != null)
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ih = ih.getPrev();
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// Find the handle for "this" JsrInstruction object.
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while(ih.getInstruction() != this)
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ih = ih.getNext();
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InstructionHandle toThis = ih;
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while(ih != null){
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ih = ih.getNext();
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if ((ih != null) && (ih.getInstruction() == this))
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throw new RuntimeException("physicalSuccessor() called on a shared JsrInstruction.");
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}
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// Return the physical successor
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return toThis.getNext();
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}
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}
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