openjdkjvmti/object_tagging.h

/* 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.
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 * 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
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#ifndef ART_OPENJDKJVMTI_OBJECT_TAGGING_H_
#define ART_OPENJDKJVMTI_OBJECT_TAGGING_H_

#include <unordered_map>

#include "base/mutex.h"
#include "globals.h"
#include "jvmti.h"
#include "jvmti_weak_table.h"
#include "mirror/object.h"

namespace openjdkjvmti {

struct ArtJvmTiEnv;
class EventHandler;

class ObjectTagTable FINAL : public JvmtiWeakTable<jlong> {
 public:
  ObjectTagTable(EventHandler* event_handler, ArtJvmTiEnv* env)
      : event_handler_(event_handler), jvmti_env_(env) {}

  bool Set(art::mirror::Object* obj, jlong tag) OVERRIDE
      REQUIRES_SHARED(art::Locks::mutator_lock_)
      REQUIRES(!allow_disallow_lock_);
  bool SetLocked(art::mirror::Object* obj, jlong tag) OVERRIDE
      REQUIRES_SHARED(art::Locks::mutator_lock_)
      REQUIRES(allow_disallow_lock_);

  jlong GetTagOrZero(art::mirror::Object* obj)
      REQUIRES_SHARED(art::Locks::mutator_lock_)
      REQUIRES(!allow_disallow_lock_) {
    jlong tmp = 0;
    GetTag(obj, &tmp);
    return tmp;
  }
  jlong GetTagOrZeroLocked(art::mirror::Object* obj)
      REQUIRES_SHARED(art::Locks::mutator_lock_)
      REQUIRES(allow_disallow_lock_) {
    jlong tmp = 0;
    GetTagLocked(obj, &tmp);
    return tmp;
  }

 protected:
  bool DoesHandleNullOnSweep() OVERRIDE;
  void HandleNullSweep(jlong tag) OVERRIDE;

 private:
  EventHandler* event_handler_;
  ArtJvmTiEnv* jvmti_env_;
};

}  // namespace openjdkjvmti

#endif  // ART_OPENJDKJVMTI_OBJECT_TAGGING_H_