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/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
/*
* Copyright 2010-2011 Andrea Canciani
*
* 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 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.
*
* Author(s): Andrea Canciani <ranma42@gmail.com>
*/
#ifndef SIMPLEOPS_COMPILER_UTILS_H
#define SIMPLEOPS_COMPILER_UTILS_H
#ifndef SIMPLEOPS_COMPILER_H
#error Private header used directly
#endif
/**
* Computes the number of elements of an array
*/
#define SIMPLEOPS_ARRAY_LENGTH(x) (sizeof (x) / sizeof (x[0]))
#define _SIMPLEOPS_CONCAT(x,y) x ## y
#define _SIMPLEOPS_RESOLVE_CONCAT(x,y) _SIMPLEOPS_CONCAT(x,y)
/**
* Prepends the SIMPLEOPS_PREFIX to the argument.
*
* This macro is used to generate non-static identifiers that do not
* collide across multiple libraries. In order to use it,
* SIMPLEOPS_PREFIX should be defined to an appropriate identifier.
*/
#define SIMPLEOPS_ADD_PREFIX(x) _SIMPLEOPS_RESOLVE_CONCAT(SIMPLEOPS_PREFIX, x)
#define _SIMPLEOPS_COMPILE_TIME_RAW_ASSERT(condition, line) \
typedef int compile_time_assertion_at_line_##line##_failed [(condition)?1:-1]
#define _SIMPLEOPS_COMPILE_TIME_RESOLVE_ASSERT(condition, line) \
_SIMPLEOPS_COMPILE_TIME_RAW_ASSERT(condition, line)
/**
* Asserts that the condition is TRUE at compile time.
*
* Conditions that cannot be evaluated at compile time cannot be used
* in these assertions.
*/
#define SIMPLEOPS_COMPILE_TIME_ASSERT(condition) \
_SIMPLEOPS_COMPILE_TIME_RESOLVE_ASSERT(condition, __LINE__)
#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
#define _SIMPLEOPS_BOOLEAN_EXPR(expr) ((expr) ? TRUE : FALSE)
#define SIMPLEOPS_LIKELY(expr) \
(__builtin_expect (_SIMPLEOPS_BOOLEAN_EXPR (expr), TRUE))
#define SIMPLEOPS_UNLIKELY(expr) \
(__builtin_expect (_SIMPLEOPS_BOOLEAN_EXPR (expr), FALSE))
#else
/**
* Provides an hint to the compiler that the expression is probably
* going to be TRUE and evaluates to the value of the expression.
*/
#define SIMPLEOPS_LIKELY(expr) (expr)
/**
* Provides an hint to the compiler that the expression is probably
* going to be FALSE and evaluates to the value of the expression.
*/
#define SIMPLEOPS_UNLIKELY(expr) (expr)
#endif
/**
* Computes the address of a structure given its type and the address
* and name of one of its fields.
*/
#define SIMPLEOPS_CONTAINER_OF(ptr, type, member) \
((type*)(((char *) ptr) - offsetof (type, member)))
#endif
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