    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 */
    028public abstract class NativeVerifier {
    029
    030    /**
    031     * This class must not be instantiated.
    032     */
    033    private NativeVerifier() {
    034    }
    035
    036
    037    /**
    038     * Works only on the first argument.
    039     */
    040    public static void main( final String[] args ) {
    041        if (args.length != 1) {
    042            System.out.println("Verifier front-end: need exactly one argument.");
    043            System.exit(1);
    044        }
    045        final int dotclasspos = args[0].lastIndexOf(".class");
    046        if (dotclasspos != -1) {
    047            args[0] = args[0].substring(0, dotclasspos);
    048        }
    049        args[0] = args[0].replace('/', '.');
    050        //System.out.println(args[0]);
    051        try {
    052            Class.forName(args[0]);
    053        } catch (final ExceptionInInitializerError eiie) { //subclass of LinkageError!
    054            System.out.println("NativeVerifier: ExceptionInInitializerError encountered on '"
    055                    + args[0] + "'.");
    056            System.out.println(eiie);
    057            System.exit(1);
    058        } catch (final LinkageError le) {
    059            System.out.println("NativeVerifier: LinkageError encountered on '" + args[0] + "'.");
    060            System.out.println(le);
    061            System.exit(1);
    062        } catch (final ClassNotFoundException cnfe) {
    063            System.out.println("NativeVerifier: FILE NOT FOUND: '" + args[0] + "'.");
    064            System.exit(1);
    065        } catch (final Throwable t) { // OK to catch Throwable here as we call exit.
    066            System.out.println("NativeVerifier: Unspecified verification error on '" + args[0] + "'.");
    067            System.exit(1);
    068        }
    069        System.out.println("NativeVerifier: Class file '" + args[0] + "' seems to be okay.");
    070        System.exit(0);
    071    }
    072}