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package org.apache.bcel.verifier.structurals;
/* ====================================================================
* 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 org.apache.bcel.generic.InstructionHandle;
import java.util.ArrayList;
import java.util.Iterator;
/**
* An InstructionContext offers convenient access
* to information like control flow successors and
* such.
*
* @version $Id$
* @author <A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A>
*/
public interface InstructionContext{
/**
* The getTag and setTag methods may be used for
* temporary flagging, such as graph colouring.
* Nothing in the InstructionContext object depends
* on the value of the tag. JustIce does not use it.
*
* @see #setTag(int tag)
*/
public int getTag();
/**
* The getTag and setTag methods may be used for
* temporary flagging, such as graph colouring.
* Nothing in the InstructionContext object depends
* on the value of the tag. JustIce does not use it.
*
* @see #getTag()
*/
public void setTag(int tag);
/**
* This method symbolically executes the Instruction
* held in the InstructionContext.
* It "merges in" the incoming execution frame situation
* (see The Java Virtual Machine Specification, 2nd
* edition, page 146).
* By so doing, the outgoing execution frame situation
* is calculated.
*
* This method is JustIce-specific and is usually of
* no sense for users of the ControlFlowGraph class.
* They should use getInstruction().accept(Visitor),
* possibly in conjunction with the ExecutionVisitor.
*
*
* @see ControlFlowGraph
* @see ExecutionVisitor
* @see #getOutFrame(ArrayList)
* @return true - if and only if the "outgoing" frame situation
* changed from the one before execute()ing.
*/
boolean execute(Frame inFrame, ArrayList executionPredecessors, InstConstraintVisitor icv, ExecutionVisitor ev);
/**
* This method returns the outgoing execution frame situation;
* therefore <B>it has to be calculated by execute(Frame, ArrayList)
* first.</B>
*
* @see #execute(Frame, ArrayList, InstConstraintVisitor, ExecutionVisitor)
*/
Frame getOutFrame(ArrayList executionPredecessors);
/**
* Returns the InstructionHandle this InstructionContext is wrapped around.
*
* @return The InstructionHandle this InstructionContext is wrapped around.
*/
InstructionHandle getInstruction();
/**
* Returns the usual control flow successors.
* @see #getExceptionHandlers()
*/
InstructionContext[] getSuccessors();
/**
* Returns the exception handlers that protect this instruction.
* They are special control flow successors.
*/
ExceptionHandler[] getExceptionHandlers();
}
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