| /* |
| * 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 |
| |
| #include <assert.h> |
| |
| #include "c99_compat.h" |
| |
| /* Compute the size of an array */ |
| #ifndef ARRAY_SIZE |
| # define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) |
| #endif |
| |
| /* For compatibility with Clang's __has_builtin() */ |
| #ifndef __has_builtin |
| # define __has_builtin(x) 0 |
| #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) |
| #elif defined (_MSC_VER) |
| #define unreachable(str) \ |
| do { \ |
| assert(!str); \ |
| __assume(0); \ |
| } while (0) |
| #else |
| #define unreachable(str) assert(!str) |
| #endif |
| |
| /** |
| * Assume macro. Useful for expressing our assumptions to the compiler, |
| * typically for purposes of silencing warnings. |
| */ |
| #if __has_builtin(__builtin_assume) |
| #define assume(expr) \ |
| do { \ |
| assert(expr); \ |
| __builtin_assume(expr); \ |
| } while (0) |
| #elif defined HAVE___BUILTIN_UNREACHABLE |
| #define assume(expr) ((expr) ? ((void) 0) \ |
| : (assert(!"assumption failed"), \ |
| __builtin_unreachable())) |
| #elif defined (_MSC_VER) |
| #define assume(expr) __assume(expr) |
| #else |
| #define assume(expr) assert(expr) |
| #endif |
| |
| /* Attribute const is used for functions that have no effects other than their |
| * return value, and only rely on the argument values to compute the return |
| * value. As a result, calls to it can be CSEed. Note that using memory |
| * pointed to by the arguments is not allowed for const functions. |
| */ |
| #ifdef HAVE_FUNC_ATTRIBUTE_CONST |
| #define ATTRIBUTE_CONST __attribute__((__const__)) |
| #else |
| #define ATTRIBUTE_CONST |
| #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 |
| |
| #ifdef HAVE_FUNC_ATTRIBUTE_MALLOC |
| #define MALLOCLIKE __attribute__((__malloc__)) |
| #else |
| #define MALLOCLIKE |
| #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 |
| |
| /* Attribute pure is used for functions that have no effects other than their |
| * return value. As a result, calls to it can be dead code eliminated. |
| */ |
| #ifdef HAVE_FUNC_ATTRIBUTE_PURE |
| #define ATTRIBUTE_PURE __attribute__((__pure__)) |
| #else |
| #define ATTRIBUTE_PURE |
| #endif |
| |
| #ifdef HAVE_FUNC_ATTRIBUTE_RETURNS_NONNULL |
| #define ATTRIBUTE_RETURNS_NONNULL __attribute__((__returns_nonnull__)) |
| #else |
| #define ATTRIBUTE_RETURNS_NONNULL |
| #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 |
| |
| /** |
| * PUBLIC/USED macros |
| * |
| * If we build the library with gcc's -fvisibility=hidden flag, we'll |
| * use the PUBLIC macro to mark functions that are to be exported. |
| * |
| * We also need to define a USED attribute, so the optimizer doesn't |
| * inline a static function that we later use in an alias. - ajax |
| */ |
| #ifndef PUBLIC |
| # if defined(__GNUC__) |
| # define PUBLIC __attribute__((visibility("default"))) |
| # define USED __attribute__((used)) |
| # elif defined(_MSC_VER) |
| # define PUBLIC __declspec(dllexport) |
| # define USED |
| # else |
| # define PUBLIC |
| # define USED |
| # endif |
| #endif |
| |
| #ifdef HAVE_FUNC_ATTRIBUTE_UNUSED |
| #define UNUSED __attribute__((unused)) |
| #else |
| #define UNUSED |
| #endif |
| |
| #define MAYBE_UNUSED UNUSED |
| |
| #ifdef HAVE_FUNC_ATTRIBUTE_WARN_UNUSED_RESULT |
| #define MUST_CHECK __attribute__((warn_unused_result)) |
| #else |
| #define MUST_CHECK |
| #endif |
| |
| #if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) |
| #define ATTRIBUTE_NOINLINE __attribute__((noinline)) |
| #else |
| #define ATTRIBUTE_NOINLINE |
| #endif |
| |
| /** Compute ceiling of integer quotient of A divided by B. */ |
| #define DIV_ROUND_UP( A, B ) ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 ) |
| |
| #endif /* UTIL_MACROS_H */ |