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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.bcel.verifier;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.verifier.statics.Pass1Verifier;
import org.apache.bcel.verifier.statics.Pass2Verifier;
import org.apache.bcel.verifier.statics.Pass3aVerifier;
import org.apache.bcel.verifier.structurals.Pass3bVerifier;
/**
* A Verifier instance is there to verify a class file according to The Java Virtual
* Machine Specification, 2nd Edition.
*
* Pass-3b-verification includes pass-3a-verification;
* pass-3a-verification includes pass-2-verification;
* pass-2-verification includes pass-1-verification.
*
* A Verifier creates PassVerifier instances to perform the actual verification.
* Verifier instances are usually generated by the VerifierFactory.
*
* @version $Id$
* @see VerifierFactory
* @see PassVerifier
*/
public class Verifier {
/**
* The name of the class this verifier operates on.
*/
private final String classname;
/** A Pass1Verifier for this Verifier instance. */
private Pass1Verifier p1v;
/** A Pass2Verifier for this Verifier instance. */
private Pass2Verifier p2v;
/** The Pass3aVerifiers for this Verifier instance. Key: Interned string specifying the method number. */
private final Map<String, Pass3aVerifier> p3avs = new HashMap<>();
/** The Pass3bVerifiers for this Verifier instance. Key: Interned string specifying the method number. */
private final Map<String, Pass3bVerifier> p3bvs = new HashMap<>();
/** Returns the VerificationResult for the given pass. */
public VerificationResult doPass1() {
if (p1v == null) {
p1v = new Pass1Verifier(this);
}
return p1v.verify();
}
/** Returns the VerificationResult for the given pass. */
public VerificationResult doPass2() {
if (p2v == null) {
p2v = new Pass2Verifier(this);
}
return p2v.verify();
}
/** Returns the VerificationResult for the given pass. */
public VerificationResult doPass3a( final int method_no ) {
final String key = Integer.toString(method_no);
Pass3aVerifier p3av;
p3av = p3avs.get(key);
if (p3avs.get(key) == null) {
p3av = new Pass3aVerifier(this, method_no);
p3avs.put(key, p3av);
}
return p3av.verify();
}
/** Returns the VerificationResult for the given pass. */
public VerificationResult doPass3b( final int method_no ) {
final String key = Integer.toString(method_no);
Pass3bVerifier p3bv;
p3bv = p3bvs.get(key);
if (p3bvs.get(key) == null) {
p3bv = new Pass3bVerifier(this, method_no);
p3bvs.put(key, p3bv);
}
return p3bv.verify();
}
/**
* Instantiation is done by the VerifierFactory.
*
* @see VerifierFactory
*/
Verifier(final String fully_qualified_classname) {
classname = fully_qualified_classname;
flush();
}
/**
* Returns the name of the class this verifier operates on.
* This is particularly interesting when this verifier was created
* recursively by another Verifier and you got a reference to this
* Verifier by the getVerifiers() method of the VerifierFactory.
* @see VerifierFactory
*/
public final String getClassName() {
return classname;
}
/**
* Forget everything known about the class file; that means, really
* start a new verification of a possibly different class file from
* BCEL's repository.
*
*/
public void flush() {
p1v = null;
p2v = null;
p3avs.clear();
p3bvs.clear();
}
/**
* This returns all the (warning) messages collected during verification.
* A prefix shows from which verifying pass a message originates.
*/
public String[] getMessages() throws ClassNotFoundException {
final List<String> messages = new ArrayList<>();
if (p1v != null) {
final String[] p1m = p1v.getMessages();
for (final String element : p1m) {
messages.add("Pass 1: " + element);
}
}
if (p2v != null) {
final String[] p2m = p2v.getMessages();
for (final String element : p2m) {
messages.add("Pass 2: " + element);
}
}
for (final Pass3aVerifier pv : p3avs.values()) {
final String[] p3am = pv.getMessages();
final int meth = pv.getMethodNo();
for (final String element : p3am) {
messages.add("Pass 3a, method " + meth + " ('"
+ org.apache.bcel.Repository.lookupClass(classname).getMethods()[meth]
+ "'): " + element);
}
}
for (final Pass3bVerifier pv : p3bvs.values()) {
final String[] p3bm = pv.getMessages();
final int meth = pv.getMethodNo();
for (final String element : p3bm) {
messages.add("Pass 3b, method " + meth + " ('"
+ org.apache.bcel.Repository.lookupClass(classname).getMethods()[meth]
+ "'): " + element);
}
}
return messages.toArray(new String[messages.size()]);
}
/**
* Verifies class files.
* This is a simple demonstration of how the API of BCEL's
* class file verifier "JustIce" may be used.
* You should supply command-line arguments which are
* fully qualified namea of the classes to verify. These class files
* must be somewhere in your CLASSPATH (refer to Sun's
* documentation for questions about this) or you must have put the classes
* into the BCEL Repository yourself (via 'addClass(JavaClass)').
*/
public static void main( final String[] args ) {
System.out
.println("JustIce by Enver Haase, (C) 2001-2002.\n<http://bcel.sourceforge.net>\n<http://commons.apache.org/bcel>\n");
for (int k = 0; k < args.length; k++) {
try {
if (args[k].endsWith(".class")) {
final int dotclasspos = args[k].lastIndexOf(".class");
if (dotclasspos != -1) {
args[k] = args[k].substring(0, dotclasspos);
}
}
args[k] = args[k].replace('/', '.');
System.out.println("Now verifying: " + args[k] + "\n");
final Verifier v = VerifierFactory.getVerifier(args[k]);
VerificationResult vr;
vr = v.doPass1();
System.out.println("Pass 1:\n" + vr);
vr = v.doPass2();
System.out.println("Pass 2:\n" + vr);
if (vr == VerificationResult.VR_OK) {
final JavaClass jc = org.apache.bcel.Repository.lookupClass(args[k]);
for (int i = 0; i < jc.getMethods().length; i++) {
vr = v.doPass3a(i);
System.out.println("Pass 3a, method number " + i + " ['"
+ jc.getMethods()[i] + "']:\n" + vr);
vr = v.doPass3b(i);
System.out.println("Pass 3b, method number " + i + " ['"
+ jc.getMethods()[i] + "']:\n" + vr);
}
}
System.out.println("Warnings:");
final String[] warnings = v.getMessages();
if (warnings.length == 0) {
System.out.println("<none>");
}
for (final String warning : warnings) {
System.out.println(warning);
}
System.out.println("\n");
// avoid swapping.
v.flush();
org.apache.bcel.Repository.clearCache();
System.gc();
} catch (final ClassNotFoundException e) {
e.printStackTrace();
}
}
}
}
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