chromium/third_party/perfetto/src/protozero/message.cc

/*
 * Copyright (C) 2017 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.
 */

#include "perfetto/protozero/message.h"

#include <atomic>
#include <type_traits>

#include "perfetto/base/compiler.h"
#include "perfetto/base/logging.h"
#include "perfetto/protozero/message_arena.h"
#include "perfetto/protozero/message_handle.h"

#if !PERFETTO_IS_LITTLE_ENDIAN()
// The memcpy() for float and double below needs to be adjusted if we want to
// support big endian CPUs. There doesn't seem to be a compelling need today.
#error Unimplemented for big endian archs.
#endif

namespace protozero {

namespace {

constexpr int kBytesToCompact = …;

#if PERFETTO_DCHECK_IS_ON()
std::atomic<uint32_t> g_generation;
#endif

}  // namespace

// Do NOT put any code in the constructor or use default initialization.
// Use the Reset() method below instead.

// This method is called to initialize both root and nested messages.
void Message::Reset(ScatteredStreamWriter* stream_writer, MessageArena* arena) { … }

void Message::AppendString(uint32_t field_id, const char* str) { … }

void Message::AppendBytes(uint32_t field_id, const void* src, size_t size) { … }

size_t Message::AppendScatteredBytes(uint32_t field_id,
                                     ContiguousMemoryRange* ranges,
                                     size_t num_ranges) { … }

uint32_t Message::Finalize() { … }

Message* Message::BeginNestedMessageInternal(uint32_t field_id) { … }

void Message::EndNestedMessage() { … }

}  // namespace protozero