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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_COMPILER_SPECIFIC_H_
#define BASE_COMPILER_SPECIFIC_H_
#include "util/build_config.h"
#if defined(COMPILER_MSVC)
// For _Printf_format_string_.
#include <sal.h>
#else // Not MSVC
#define _Printf_format_string_
#endif // COMPILER_MSVC
#if defined(COMPILER_GCC) && defined(NDEBUG)
#define ALWAYS_INLINE inline __attribute__((__always_inline__))
#elif defined(COMPILER_MSVC) && defined(NDEBUG)
#define ALWAYS_INLINE __forceinline
#else
#define ALWAYS_INLINE inline
#endif
// Tell the compiler a function is using a printf-style format string.
// |format_param| is the one-based index of the format string parameter;
// |dots_param| is the one-based index of the "..." parameter.
// For v*printf functions (which take a va_list), pass 0 for dots_param.
// (This is undocumented but matches what the system C headers do.)
#if defined(COMPILER_GCC) || defined(__clang__)
#define PRINTF_FORMAT(format_param, dots_param) \
__attribute__((format(printf, format_param, dots_param)))
#else
#define PRINTF_FORMAT(format_param, dots_param)
#endif
// Macro for hinting that an expression is likely to be false.
#if !defined(UNLIKELY)
#if defined(COMPILER_GCC) || defined(__clang__)
#define UNLIKELY(x) __builtin_expect(!!(x), 0)
#else
#define UNLIKELY(x) (x)
#endif // defined(COMPILER_GCC)
#endif // !defined(UNLIKELY)
#if !defined(LIKELY)
#if defined(COMPILER_GCC) || defined(__clang__)
#define LIKELY(x) __builtin_expect(!!(x), 1)
#else
#define LIKELY(x) (x)
#endif // defined(COMPILER_GCC)
#endif // !defined(LIKELY)
// Macro for telling -Wimplicit-fallthrough that a fallthrough is intentional.
#if __cplusplus >= 201703L
#define FALLTHROUGH [[fallthrough]]
#elif defined(__clang__)
#define FALLTHROUGH [[clang::fallthrough]]
#else
#define FALLTHROUGH
#endif
#endif // BASE_COMPILER_SPECIFIC_H_
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