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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   *
17   */
18  package org.apache.bcel.verifier;
19  
20  /**
21   * The NativeVerifier class implements a main(String[] args) method that's
22   * roughly compatible to the one in the Verifier class, but that uses the
23   * JVM's internal verifier for its class file verification.
24   * This can be used for comparison runs between the JVM-internal verifier
25   * and JustIce.
26   *
27   * @version $Id: NativeVerifier.html 992795 2016-07-14 11:53:52Z britter $
28   */
29  public abstract class NativeVerifier {
30  
31      /**
32       * This class must not be instantiated.
33       */
34      private NativeVerifier() {
35      }
36  
37  
38      /**
39       * Works only on the first argument.
40       */
41      public static void main( final String[] args ) {
42          if (args.length != 1) {
43              System.out.println("Verifier front-end: need exactly one argument.");
44              System.exit(1);
45          }
46          final int dotclasspos = args[0].lastIndexOf(".class");
47          if (dotclasspos != -1) {
48              args[0] = args[0].substring(0, dotclasspos);
49          }
50          args[0] = args[0].replace('/', '.');
51          //System.out.println(args[0]);
52          try {
53              Class.forName(args[0]);
54          } catch (final ExceptionInInitializerError eiie) { //subclass of LinkageError!
55              System.out.println("NativeVerifier: ExceptionInInitializerError encountered on '"
56                      + args[0] + "'.");
57              System.out.println(eiie);
58              System.exit(1);
59          } catch (final LinkageError le) {
60              System.out.println("NativeVerifier: LinkageError encountered on '" + args[0] + "'.");
61              System.out.println(le);
62              System.exit(1);
63          } catch (final ClassNotFoundException cnfe) {
64              System.out.println("NativeVerifier: FILE NOT FOUND: '" + args[0] + "'.");
65              System.exit(1);
66          } catch (final Throwable t) { // OK to catch Throwable here as we call exit.
67              System.out.println("NativeVerifier: Unspecified verification error on '" + args[0] + "'.");
68              System.exit(1);
69          }
70          System.out.println("NativeVerifier: Class file '" + args[0] + "' seems to be okay.");
71          System.exit(0);
72      }
73  }