org.objectweb.asm.util.CheckClassAdapter#verify ( )源码实例Demo

public String dumpVerify(byte[] bytecode, ClassLoader classLoader) {
    if (bytecode == null) {
        throw new NullPointerException("bytecode");
    }
    if (classLoader == null) {
        throw new NullPointerException("classLoader");
    }

    final StringWriter out = new StringWriter();
    final PrintWriter writer = new PrintWriter(out);

    final ClassReader cr = new ClassReader(bytecode);
    CheckClassAdapter.verify(cr, classLoader, true, writer);

    return out.toString();
}
 

/**
 * See {@link org.objectweb.asm.util.CheckClassAdapter#verify(ClassReader, boolean, PrintWriter)}.
 */
public static void verify(final ClassReader cr, final boolean dump,
    final PrintWriter pw) {
  /*
   * For plain verification, we don't need to restore the original access
   * bytes the way we do when the check adapter is used as part of a chain, so
   * we can just strip it and use the ASM version directly.
   */
  final ClassWriter classWriter = new ClassWriter(0);
  cr.accept(new InnerClassAccessStripper(CompilationConfig.ASM_API_VERSION,
      classWriter), ClassReader.SKIP_DEBUG);
  final ClassReader strippedCr = new ClassReader(classWriter.toByteArray());
  CheckClassAdapter.verify(strippedCr, dump, pw);
}
 

private byte[] assertValidClass(final Class<?> clazz)
    throws IllegalClassFormatException {
  final byte[] bs = transform(clazz);
  // printClass(bs);
  final StringWriter sw = new StringWriter();
  CheckClassAdapter.verify(new ClassReader(bs), false, new PrintWriter(sw));
  assertTrue(sw.toString(), sw.toString().length() == 0);
  return bs;

}
 

private void verifyMutant(final Mutant mutant) {
  // printMutant(mutant);
  final StringWriter sw = new StringWriter();
  final PrintWriter pw = new PrintWriter(sw);
  CheckClassAdapter.verify(new ClassReader(mutant.getBytes()), false, pw);
  assertTrue(sw.toString(), sw.toString().length() == 0);

}
 

private void assertValidClass(final Class<?> clazz)
    throws IllegalClassFormatException {
  final byte[] bs = transform(clazz);
  // printClass(bs);
  final StringWriter sw = new StringWriter();
  CheckClassAdapter.verify(new ClassReader(bs), false, new PrintWriter(sw));
  assertTrue(sw.toString(), sw.toString().length() == 0);

}
 

protected void instrumentWorkflows(File adaptedTargetDir, Map<String, Clazz> clazzMap, Map<String, ClassInfo> classInfos, ClassLoader tmpClassLoader) throws IOException {
    logger.info("Instrumenting classfiles");
    for (Clazz clazz : clazzMap.values()) {
        byte[] bytes;
        InputStream is = clazz.classfile.openStream();
        try {
            ClassReader cr2 = new ClassReader(is);
            ClassNode cn = new ClassNode();
            cr2.accept(cn, flags);
            traceClassNode(clazz.classname + " - original", cn);

            // Now content of ClassNode can be modified and then serialized back into bytecode:
            new TryCatchBlockHandler().instrument(cn);

            ClassWriter cw2 = new ClassWriter(0);
            cn.accept(cw2);
            bytes = cw2.toByteArray();
            traceBytes(clazz.classname + " - after TryCatchBlockHandler", bytes);

            ClassReader cr = new ClassReader(bytes);
            ClassWriter cw = new ClassWriter(0);

            ScottyClassAdapter cv = new ScottyClassAdapter(cw, clazz.aggregatedInterruptableMethods);
            cr.accept(cv, flags);
            classInfos.put(clazz.classname, cv.getClassInfo());
            bytes = cw.toByteArray();
            traceBytes(clazz.classname + " - after ScottyClassAdapter", bytes);

            // Recompute frames, etc.
            ClassReader cr3 = new ClassReader(bytes);
            ClassWriter cw3 = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
            cr3.accept(cw3, ClassReader.SKIP_FRAMES);
            bytes = cw3.toByteArray();
            traceBytes(clazz.classname + " - after COMPUTE_FRAMES", bytes);

            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            CheckClassAdapter.verify(new ClassReader(cw.toByteArray()), tmpClassLoader, false, pw);
            if (sw.toString().length() != 0) {
                logger.error("CheckClassAdapter.verify failed for class " + cn.name + ":\n" + sw.toString());
            } else {
                logger.info("CheckClassAdapter.verify succeeded for class " + cn.name);
            }

        } finally {
            is.close();
        }

        File adaptedClassfileName = new File(adaptedTargetDir, clazz.classname + ".class");
        adaptedClassfileName.getParentFile().mkdirs();
        FileOutputStream fos = new FileOutputStream(adaptedClassfileName);
        try {
            fos.write(bytes);
        } finally {
            fos.close();
        }
    }
}
 

/**
 * Dumps the output of CheckClassAdapter.verify to System.out
 *
 * @param bytes the bytecode of the class to check
 */
public static void dumpClass(byte[] bytes) {
    ClassReader cr = new ClassReader(bytes);
    CheckClassAdapter.verify(cr, true, new PrintWriter(System.out));
}