asm4/test/conform/org/objectweb/asm/commons/LocalVariablesSorterTest2.java

/***
 * ASM tests
 * Copyright (c) 2000-2011 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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package org.objectweb.asm.commons;

import java.io.InputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.security.ProtectionDomain;

import junit.framework.TestSuite;

import org.objectweb.asm.AbstractTest;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.util.TraceClassVisitor;

/**
 * LocalVariablesSorter tests.
 * 
 * @author Eric Bruneton
 */
public class LocalVariablesSorterTest2 extends AbstractTest {

    public static void premain(final String agentArgs,
            final Instrumentation inst) {
        inst.addTransformer(new ClassFileTransformer() {
            public byte[] transform(final ClassLoader loader,
                    final String className, final Class<?> classBeingRedefined,
                    final ProtectionDomain domain, final byte[] classFileBuffer)
                    throws IllegalClassFormatException {
                String n = className.replace('/', '.');
                if (agentArgs.length() == 0 || n.indexOf(agentArgs) != -1) {
                    return transformClass(classFileBuffer);
                } else {
                    return null;
                }
            }
        });
    }

    static byte[] transformClass(final byte[] clazz) {
        ClassReader cr = new ClassReader(clazz);
        ClassWriter cw = new ClassWriter(0);
        cr.accept(new ClassVisitor(Opcodes.ASM4, cw) {

            @Override
            public MethodVisitor visitMethod(final int access,
                    final String name, final String desc,
                    final String signature, final String[] exceptions) {
                return new LocalVariablesSorter(access, desc, cv.visitMethod(
                        access, name, desc, signature, exceptions));
            }

        }, ClassReader.EXPAND_FRAMES);
        return cw.toByteArray();
    }

    public static TestSuite suite() throws Exception {
        TestSuite suite = new LocalVariablesSorterTest2().getSuite();
        suite.addTest(new VerifierTest());
        return suite;
    }

    @Override
    public void test() throws Exception {
        try {
            Class.forName(n, true, getClass().getClassLoader());
        } catch (NoClassDefFoundError ncdfe) {
            // ignored
        } catch (UnsatisfiedLinkError ule) {
            // ignored
        } catch (ClassFormatError cfe) {
            fail(cfe.getMessage());
        } catch (VerifyError ve) {
            String s = n.replace('.', '/') + ".class";
            InputStream is = getClass().getClassLoader().getResourceAsStream(s);
            ClassReader cr = new ClassReader(is);
            byte[] b = transformClass(cr.b);
            StringWriter sw1 = new StringWriter();
            StringWriter sw2 = new StringWriter();
            sw2.write(ve.toString() + "\n");
            ClassVisitor cv1 = new TraceClassVisitor(new PrintWriter(sw1));
            ClassVisitor cv2 = new TraceClassVisitor(new PrintWriter(sw2));
            cr.accept(cv1, 0);
            new ClassReader(b).accept(cv2, 0);
            String s1 = sw1.toString();
            String s2 = sw2.toString();
            assertEquals("different data", s1, s2);
        }
    }
}