| /* |
| * Copyright © 2014 Intel Corporation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| */ |
| |
| #ifndef UTIL_MACROS_H |
| #define UTIL_MACROS_H |
| |
| /* Compute the size of an array */ |
| #ifndef ARRAY_SIZE |
| # define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) |
| #endif |
| |
| |
| /** |
| * __builtin_expect macros |
| */ |
| #if !defined(HAVE___BUILTIN_EXPECT) |
| # define __builtin_expect(x, y) (x) |
| #endif |
| |
| #ifndef likely |
| # ifdef HAVE___BUILTIN_EXPECT |
| # define likely(x) __builtin_expect(!!(x), 1) |
| # define unlikely(x) __builtin_expect(!!(x), 0) |
| # else |
| # define likely(x) (x) |
| # define unlikely(x) (x) |
| # endif |
| #endif |
| |
| |
| /** |
| * Static (compile-time) assertion. |
| * Basically, use COND to dimension an array. If COND is false/zero the |
| * array size will be -1 and we'll get a compilation error. |
| */ |
| #define STATIC_ASSERT(COND) \ |
| do { \ |
| (void) sizeof(char [1 - 2*!(COND)]); \ |
| } while (0) |
| |
| |
| /** |
| * Unreachable macro. Useful for suppressing "control reaches end of non-void |
| * function" warnings. |
| */ |
| #ifdef HAVE___BUILTIN_UNREACHABLE |
| #define unreachable(str) \ |
| do { \ |
| assert(!str); \ |
| __builtin_unreachable(); \ |
| } while (0) |
| #endif |
| |
| #ifndef unreachable |
| #define unreachable(str) |
| #endif |
| |
| #ifdef HAVE_FUNC_ATTRIBUTE_FLATTEN |
| #define FLATTEN __attribute__((__flatten__)) |
| #else |
| #define FLATTEN |
| #endif |
| |
| #ifdef HAVE_FUNC_ATTRIBUTE_FORMAT |
| #define PRINTFLIKE(f, a) __attribute__ ((format(__printf__, f, a))) |
| #else |
| #define PRINTFLIKE(f, a) |
| #endif |
| |
| /* Used to optionally mark structures with misaligned elements or size as |
| * packed, to trade off performance for space. |
| */ |
| #ifdef HAVE_FUNC_ATTRIBUTE_PACKED |
| #define PACKED __attribute__((__packed__)) |
| #else |
| #define PACKED |
| #endif |
| |
| #ifdef __cplusplus |
| /** |
| * Macro function that evaluates to true if T is a trivially |
| * destructible type -- that is, if its (non-virtual) destructor |
| * performs no action and all member variables and base classes are |
| * trivially destructible themselves. |
| */ |
| # if defined(__GNUC__) |
| # if ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3))) |
| # define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T) |
| # endif |
| # elif (defined(__clang__) && defined(__has_feature)) |
| # if __has_feature(has_trivial_destructor) |
| # define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T) |
| # endif |
| # endif |
| # ifndef HAS_TRIVIAL_DESTRUCTOR |
| /* It's always safe (if inefficient) to assume that a |
| * destructor is non-trivial. |
| */ |
| # define HAS_TRIVIAL_DESTRUCTOR(T) (false) |
| # endif |
| #endif |
| |
| #endif /* UTIL_MACROS_H */ |