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- package org.aspectj.apache.bcel.verifier;
-
- /* ====================================================================
- * 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.util.ArrayList;
-
- /**
- * A PassVerifier actually verifies a class file; it is instantiated
- * by a Verifier.
- * The verification should conform with a certain pass as described
- * in The Java Virtual Machine Specification, 2nd edition.
- * This book describes four passes. Pass one means loading the
- * class and verifying a few static constraints. Pass two actually
- * verifies some other constraints that could enforce loading in
- * referenced class files. Pass three is the first pass that actually
- * checks constraints in the code array of a method in the class file;
- * it has two parts with the first verifying static constraints and
- * the second part verifying structural constraints (where a data flow
- * analysis is used for). The fourth pass, finally, performs checks
- * that can only be done at run-time.
- * JustIce does not have a run-time pass, but certain constraints that
- * are usually delayed until run-time for performance reasons are also
- * checked during the second part of pass three.
- * PassVerifier instances perform caching.
- * That means, if you really want a new verification run of a certain
- * pass you must use a new instance of a given PassVerifier.
- *
- * @version $Id: PassVerifier.java,v 1.2 2008/05/28 23:53:00 aclement Exp $
- * @author <A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A>
- * @see org.aspectj.apache.bcel.verifier.Verifier
- * @see #verify()
- */
- public abstract class PassVerifier{
-
- /** The (warning) messages. */
- private ArrayList messages = new ArrayList(); //Type of elements: String
-
- /** The VerificationResult cache. */
- private VerificationResult verificationResult = null;
-
- /**
- * This method runs a verification pass conforming to the
- * Java Virtual Machine Specification, 2nd edition, on a
- * class file.
- * PassVerifier instances perform caching;
- * i.e. if the verify() method once determined a VerificationResult,
- * then this result may be returned after every invocation of this
- * method instead of running the verification pass anew; likewise with
- * the result of getMessages().
- *
- * @see #getMessages()
- * @see #addMessage(String)
- */
- public VerificationResult verify(){
- if (verificationResult == null){
- verificationResult = do_verify();
- }
- return verificationResult;
- }
-
- /** Does the real verification work, uncached. */
- public abstract VerificationResult do_verify();
-
- /**
- * This method adds a (warning) message to the message pool of this
- * PassVerifier. This method is normally only internally used by
- * BCEL's class file verifier "JustIce" and should not be used from
- * the outside.
- *
- * @see #getMessages()
- */
- public void addMessage(String message){
- messages.add(message);
- }
-
- /**
- * Returns the (warning) messages that this PassVerifier accumulated
- * during its do_verify()ing work.
- *
- * @see #addMessage(String)
- * @see #do_verify()
- */
- public String[] getMessages(){
- verify(); // create messages if not already done (cached!)
- String[] ret = new String[messages.size()];
- for (int i=0; i<messages.size(); i++){
- ret[i] = (String) messages.get(i);
- }
- return ret;
- }
- }
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