runtime/openjdkjvmti/ti_class_definition.h

/* Copyright (C) 2017 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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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef ART_RUNTIME_OPENJDKJVMTI_TI_CLASS_DEFINITION_H_
#define ART_RUNTIME_OPENJDKJVMTI_TI_CLASS_DEFINITION_H_

#include "art_jvmti.h"

namespace openjdkjvmti {

// A struct that stores data needed for redefining/transforming classes. This structure should only
// even be accessed from a single thread and must not survive past the completion of the
// redefinition/retransformation function that created it.
struct ArtClassDefinition {
 public:
  jclass klass;
  jobject loader;
  std::string name;
  jobject protection_domain;
  jint dex_len;
  JvmtiUniquePtr<unsigned char> dex_data;
  art::ArraySlice<const unsigned char> original_dex_file;

  ArtClassDefinition()
      : klass(nullptr),
        loader(nullptr),
        name(),
        protection_domain(nullptr),
        dex_len(0),
        dex_data(nullptr),
        original_dex_file(),
        modified(false) {}

  ArtClassDefinition(ArtClassDefinition&& o) = default;

  void SetNewDexData(ArtJvmTiEnv* env, jint new_dex_len, unsigned char* new_dex_data) {
    if (new_dex_data == nullptr) {
      return;
    } else if (new_dex_data != dex_data.get() || new_dex_len != dex_len) {
      SetModified();
      dex_len = new_dex_len;
      dex_data = MakeJvmtiUniquePtr(env, new_dex_data);
    }
  }

  void SetModified() {
    modified = true;
  }

  bool IsModified(art::Thread* self) const REQUIRES_SHARED(art::Locks::mutator_lock_);

 private:
  bool modified;
};

}  // namespace openjdkjvmti

#endif  // ART_RUNTIME_OPENJDKJVMTI_TI_CLASS_DEFINITION_H_