/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * 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.
 */

#pragma once

#include <cerrno>

#include <folly/Portability.h>
#include <folly/Preprocessor.h>

#define FOLLY_SAFE_CHECK_IMPL(expr, expr_s, msg, error) \
  ((expr) ? static_cast<void>(0)                        \
          : ::folly::detail::assertionFailure(          \
                FOLLY_PP_STRINGIZE(expr_s),             \
                (msg),                                  \
                __FILE__,                               \
                __LINE__,                               \
                __PRETTY_FUNCTION__,                    \
                error))

/**
 * Verify that the expression is true. If not, prints an error message
 * (containing msg) to stderr and abort()s. Just like CHECK(), but only
 * logs to stderr and only does async-signal-safe calls.
 */
#define FOLLY_SAFE_CHECK(expr, msg) \
  FOLLY_SAFE_CHECK_IMPL((expr), (expr), (msg), 0)

/**
 * In debug mode, verify that the expression is true. Otherwise, do nothing
 * (do not even evaluate expr). Just like DCHECK(), but only logs to stderr and
 * only does async-signal-safe calls.
 */
#define FOLLY_SAFE_DCHECK(expr, msg) \
  FOLLY_SAFE_CHECK_IMPL(!::folly::kIsDebug || (expr), (expr), (msg), 0)

/**
 * Like FOLLY_SAFE_CHECK, but also prints errno.
 */
#define FOLLY_SAFE_PCHECK(expr, msg) \
  FOLLY_SAFE_CHECK_IMPL((expr), (expr), (msg), errno)

namespace folly {
namespace detail {

[[noreturn]] void assertionFailure(
    const char* expr,
    const char* msg,
    const char* file,
    unsigned int line,
    const char* function,
    int error);
} // namespace detail
} // namespace folly