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}