message_arena.h | Explore in Territory

/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef INCLUDE_PERFETTO_PROTOZERO_MESSAGE_ARENA_H_
#define INCLUDE_PERFETTO_PROTOZERO_MESSAGE_ARENA_H_

#include <stdint.h>

#include <forward_list>
#include <type_traits>

#include "perfetto/base/export.h"
#include "perfetto/base/logging.h"
#include "perfetto/protozero/message.h"

namespace protozero {

class Message;

// Object allocator for fixed-sized protozero::Message objects.
// It's a simple bump-pointer allocator which leverages the stack-alike
// usage pattern of protozero nested messages. It avoids hitting the system
// allocator in most cases, by reusing the same block, and falls back on
// allocating new blocks only when using deeply nested messages (which are
// extremely rare).
// This is used by RootMessage<T> to handle the storage for root-level messages.
class PERFETTO_EXPORT_COMPONENT MessageArena { … };

}  // namespace protozero

#endif  // INCLUDE_PERFETTO_PROTOZERO_MESSAGE_ARENA_H_
chromium/third_party/perfetto/include/perfetto/protozero/message_arena.h
