| // 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 COMPILER_GCC && defined(NDEBUG) |
| #define ALWAYS_INLINE inline __attribute__((__always_inline__)) |
| #elif 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 defined(__clang__) |
| #define FALLTHROUGH [[clang::fallthrough]] |
| #else |
| #define FALLTHROUGH |
| #endif |
| |
| #endif // BASE_COMPILER_SPECIFIC_H_ |