chromium/third_party/abseil-cpp/absl/log/internal/strip.h

// Copyright 2022 The Abseil Authors.
//
// 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
//
//      https://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.
//
// -----------------------------------------------------------------------------
// File: log/internal/strip.h
// -----------------------------------------------------------------------------
//

#ifndef ABSL_LOG_INTERNAL_STRIP_H_
#define ABSL_LOG_INTERNAL_STRIP_H_

#include "absl/base/attributes.h"  // IWYU pragma: keep
#include "absl/base/log_severity.h"
#include "absl/log/internal/log_message.h"
#include "absl/log/internal/nullstream.h"

// `ABSL_LOGGING_INTERNAL_LOG_*` evaluates to a temporary `LogMessage` object or
// to a related object with a compatible API but different behavior.  This set
// of defines comes in three flavors: vanilla, plus two variants that strip some
// logging in subtly different ways for subtly different reasons (see below).
#if defined(STRIP_LOG) && STRIP_LOG

// Attribute for marking variables used in implementation details of logging
// macros as unused, but only when `STRIP_LOG` is defined.
// With `STRIP_LOG` on, not marking them triggers `-Wunused-but-set-variable`,
// With `STRIP_LOG` off, marking them triggers `-Wused-but-marked-unused`.
//
// TODO(b/290784225): Replace this macro with attribute [[maybe_unused]] when
// Abseil stops supporting C++14.
#define ABSL_LOG_INTERNAL_ATTRIBUTE_UNUSED_IF_STRIP_LOG …

#define ABSL_LOGGING_INTERNAL_LOG_INFO …
#define ABSL_LOGGING_INTERNAL_LOG_WARNING …
#define ABSL_LOGGING_INTERNAL_LOG_ERROR …
#define ABSL_LOGGING_INTERNAL_LOG_FATAL …
#define ABSL_LOGGING_INTERNAL_LOG_QFATAL …
#define ABSL_LOGGING_INTERNAL_LOG_DFATAL …
#define ABSL_LOGGING_INTERNAL_LOG_LEVEL …

// Fatal `DLOG`s expand a little differently to avoid being `[[noreturn]]`.
#define ABSL_LOGGING_INTERNAL_DLOG_FATAL …
#define ABSL_LOGGING_INTERNAL_DLOG_QFATAL …

#define ABSL_LOG_INTERNAL_CHECK …
#define ABSL_LOG_INTERNAL_QCHECK …

#else  // !defined(STRIP_LOG) || !STRIP_LOG

#define ABSL_LOG_INTERNAL_ATTRIBUTE_UNUSED_IF_STRIP_LOG

#define ABSL_LOGGING_INTERNAL_LOG_INFO …
#define ABSL_LOGGING_INTERNAL_LOG_WARNING …
#define ABSL_LOGGING_INTERNAL_LOG_ERROR …
#define ABSL_LOGGING_INTERNAL_LOG_FATAL …
#define ABSL_LOGGING_INTERNAL_LOG_QFATAL …
#define ABSL_LOGGING_INTERNAL_LOG_DFATAL …
#define ABSL_LOGGING_INTERNAL_LOG_LEVEL(severity) …

// Fatal `DLOG`s expand a little differently to avoid being `[[noreturn]]`.
#define ABSL_LOGGING_INTERNAL_DLOG_FATAL …
#define ABSL_LOGGING_INTERNAL_DLOG_QFATAL …

// These special cases dispatch to special-case constructors that allow us to
// avoid an extra function call and shrink non-LTO binaries by a percent or so.
#define ABSL_LOG_INTERNAL_CHECK(failure_message) …
#define ABSL_LOG_INTERNAL_QCHECK(failure_message) …
#endif  // !defined(STRIP_LOG) || !STRIP_LOG

// This part of a non-fatal `DLOG`s expands the same as `LOG`.
#define ABSL_LOGGING_INTERNAL_DLOG_INFO …
#define ABSL_LOGGING_INTERNAL_DLOG_WARNING …
#define ABSL_LOGGING_INTERNAL_DLOG_ERROR …
#define ABSL_LOGGING_INTERNAL_DLOG_DFATAL …
#define ABSL_LOGGING_INTERNAL_DLOG_LEVEL …

#endif  // ABSL_LOG_INTERNAL_STRIP_H_