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/*************************************************************************
* Copyright (C) 2010-2014 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Internally-used compiler abstractions.
*/
#include <stdalign.h>
/**
* @def dmnsn_likely
* Indicate that a test is likely to succeed.
* @param test The test to perform.
* @return The truth value of \p test.
*/
/**
* @def dmnsn_unlikely
* Indicate that a test is unlikely to succeed.
* @param test The test to perform.
* @return The truth value of \p test.
*/
#ifdef DMNSN_PROFILE
#define dmnsn_likely(test) \
dmnsn_expect(!!(test), true, DMNSN_FUNC, __FILE__, __LINE__)
#define dmnsn_unlikely(test) \
dmnsn_expect(!!(test), false, DMNSN_FUNC, __FILE__, __LINE__)
#elif DMNSN_GNUC
#define dmnsn_likely(test) __builtin_expect(!!(test), true)
#define dmnsn_unlikely(test) __builtin_expect(!!(test), false)
#else
#define dmnsn_likely(test) (!!(test))
#define dmnsn_unlikely(test) (!!(test))
#endif
/**
* @def DMNSN_HOT
* Mark a function as a hot path.
*/
/**
* @def DMNSN_INTERNAL
* Mark a function as internal linkage.
*/
/**
* @def DMNSN_DESTRUCTOR
* Queue a function to run at program termination.
*/
/**
* @def DMNSN_LATE_DESTRUCTOR
* Queue a function to run at program termination, after those labeled
* DMNSN_DESTRUCTOR.
*/
#if DMNSN_GNUC
#define DMNSN_HOT __attribute__((hot))
#define DMNSN_INTERNAL __attribute__((visibility("hidden")))
#define DMNSN_DESTRUCTOR __attribute__((destructor(102)))
#define DMNSN_LATE_DESTRUCTOR __attribute__((destructor(101)))
#else
#define DMNSN_HOT
#define DMNSN_INTERNAL
#define DMNSN_DESTRUCTOR
#define DMNSN_LATE_DESTRUCTOR
#endif
/// Synonym for _Atomic that stdatomic.h doesn't define for some reason
#define atomic _Atomic
/// C11-compliant alloca variant
#define DMNSN_ALLOCA(var, size) DMNSN_ALLOCA_IMPL(var, size, __LINE__)
#define DMNSN_ALLOCA_IMPL(var, size, ctr) DMNSN_ALLOCA_IMPL2(var, size, ctr)
#define DMNSN_ALLOCA_IMPL2(var, size, ctr) \
alignas(max_align_t) char dmnsn_alloca##ctr[size]; \
var = (void *)dmnsn_alloca##ctr
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