runtime/openjdkjvmti/ti_class_definition.cc

/* Copyright (C) 2016 The Android Open Source Project
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This file implements interfaces from the file jvmti.h. This implementation
 * is licensed under the same terms as the file jvmti.h.  The
 * copyright and license information for the file jvmti.h follows.
 *
 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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#include "ti_class_definition.h"

#include "dex_file.h"
#include "handle_scope-inl.h"
#include "handle.h"
#include "mirror/class-inl.h"
#include "mirror/object-inl.h"
#include "thread.h"

namespace openjdkjvmti {

bool ArtClassDefinition::IsModified() const {
  // RedefineClasses calls always are 'modified' since they need to change the original_dex_file of
  // the class.
  if (redefined) {
    return true;
  }
  // Check if the dex file we want to set is the same as the current one.
  // Unfortunately we need to do this check even if no modifications have been done since it could
  // be that agents were removed in the mean-time so we still have a different dex file. The dex
  // checksum means this is likely to be fairly fast.
  return static_cast<jint>(original_dex_file.size()) != dex_len ||
      memcmp(&original_dex_file.At(0), dex_data.get(), dex_len) != 0;
}

}  // namespace openjdkjvmti