001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 *
017 */
018package org.apache.bcel.verifier;
019
020/**
021 * The NativeVerifier class implements a main(String[] args) method that's
022 * roughly compatible to the one in the Verifier class, but that uses the
023 * JVM's internal verifier for its class file verification.
024 * This can be used for comparison runs between the JVM-internal verifier
025 * and JustIce.
026 *
027 * @version $Id: NativeVerifier.java 1749603 2016-06-21 20:50:19Z ggregory $
028 */
029public abstract class NativeVerifier {
030
031    /**
032     * This class must not be instantiated.
033     */
034    private NativeVerifier() {
035    }
036
037
038    /**
039     * Works only on the first argument.
040     */
041    public static void main( final String[] args ) {
042        if (args.length != 1) {
043            System.out.println("Verifier front-end: need exactly one argument.");
044            System.exit(1);
045        }
046        final int dotclasspos = args[0].lastIndexOf(".class");
047        if (dotclasspos != -1) {
048            args[0] = args[0].substring(0, dotclasspos);
049        }
050        args[0] = args[0].replace('/', '.');
051        //System.out.println(args[0]);
052        try {
053            Class.forName(args[0]);
054        } catch (final ExceptionInInitializerError eiie) { //subclass of LinkageError!
055            System.out.println("NativeVerifier: ExceptionInInitializerError encountered on '"
056                    + args[0] + "'.");
057            System.out.println(eiie);
058            System.exit(1);
059        } catch (final LinkageError le) {
060            System.out.println("NativeVerifier: LinkageError encountered on '" + args[0] + "'.");
061            System.out.println(le);
062            System.exit(1);
063        } catch (final ClassNotFoundException cnfe) {
064            System.out.println("NativeVerifier: FILE NOT FOUND: '" + args[0] + "'.");
065            System.exit(1);
066        } catch (final Throwable t) { // OK to catch Throwable here as we call exit.
067            System.out.println("NativeVerifier: Unspecified verification error on '" + args[0] + "'.");
068            System.exit(1);
069        }
070        System.out.println("NativeVerifier: Class file '" + args[0] + "' seems to be okay.");
071        System.exit(0);
072    }
073}