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
020import org.apache.bcel.classfile.Utility;
021
022/**
023 * The NativeVerifier class implements a main(String[] args) method that's roughly compatible to the one in the Verifier
024 * class, but that uses the JVM's internal verifier for its class file verification. This can be used for comparison
025 * runs between the JVM-internal verifier and JustIce.
026 *
027 */
028public abstract class NativeVerifier {
029
030    /**
031     * Works only on the first argument.
032     */
033    public static void main(final String[] args) {
034        if (args.length != 1) {
035            System.out.println("Verifier front-end: need exactly one argument.");
036            System.exit(1);
037        }
038        final int dotclasspos = args[0].lastIndexOf(".class");
039        if (dotclasspos != -1) {
040            args[0] = args[0].substring(0, dotclasspos);
041        }
042        args[0] = Utility.pathToPackage(args[0]);
043        // System.out.println(args[0]);
044        try {
045            Class.forName(args[0]);
046        } catch (final ExceptionInInitializerError eiie) { // subclass of LinkageError!
047            System.out.println("NativeVerifier: ExceptionInInitializerError encountered on '" + args[0] + "'.");
048            System.out.println(eiie);
049            System.exit(1);
050        } catch (final LinkageError le) {
051            System.out.println("NativeVerifier: LinkageError encountered on '" + args[0] + "'.");
052            System.out.println(le);
053            System.exit(1);
054        } catch (final ClassNotFoundException cnfe) {
055            System.out.println("NativeVerifier: FILE NOT FOUND: '" + args[0] + "'.");
056            System.exit(1);
057        } catch (final Throwable t) { // OK to catch Throwable here as we call exit.
058            System.out.println("NativeVerifier: Unspecified verification error on '" + args[0] + "'.");
059            System.exit(1);
060        }
061        System.out.println("NativeVerifier: Class file '" + args[0] + "' seems to be okay.");
062        System.exit(0);
063    }
064
065    /**
066     * This class must not be instantiated.
067     */
068    private NativeVerifier() {
069    }
070}