| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| 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/>. |
| */ |
| |
| /** |
| * Super class for JSR - Jump to subroutine |
| * |
| * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> |
| */ |
| public abstract class JsrInstruction extends BranchInstruction |
| implements UnconditionalBranch, TypedInstruction, StackProducer |
| { |
| JsrInstruction(short opcode, InstructionHandle target) { |
| super(opcode, target); |
| } |
| |
| /** |
| * Empty constructor needed for the Class.newInstance() statement in |
| * Instruction.readInstruction(). Not to be used otherwise. |
| */ |
| JsrInstruction(){} |
| |
| /** @return return address type |
| */ |
| public Type getType(ConstantPoolGen cp) { |
| return new ReturnaddressType(physicalSuccessor()); |
| } |
| |
| /** |
| * Returns an InstructionHandle to the physical successor |
| * of this JsrInstruction. <B>For this method to work, |
| * this JsrInstruction object must not be shared between |
| * multiple InstructionHandle objects!</B> |
| * Formally, there must not be InstructionHandle objects |
| * i, j where i != j and i.getInstruction() == this == |
| * j.getInstruction(). |
| * @return an InstructionHandle to the "next" instruction that |
| * will be executed when RETurned from a subroutine. |
| */ |
| public InstructionHandle physicalSuccessor(){ |
| InstructionHandle ih = this.target; |
| |
| // Rewind! |
| while(ih.getPrev() != null) |
| ih = ih.getPrev(); |
| |
| // Find the handle for "this" JsrInstruction object. |
| while(ih.getInstruction() != this) |
| ih = ih.getNext(); |
| |
| InstructionHandle toThis = ih; |
| |
| while(ih != null){ |
| ih = ih.getNext(); |
| if ((ih != null) && (ih.getInstruction() == this)) |
| throw new RuntimeException("physicalSuccessor() called on a shared JsrInstruction."); |
| } |
| |
| // Return the physical successor |
| return toThis.getNext(); |
| } |
| } |