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76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
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/*-
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* Copyright (c) 2018 Taylor R. Campbell
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/**
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* \file ctassert.h
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*
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* \brief Compile-time assertions: CTASSERT(expression).
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*/
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#ifndef TOR_CTASSERT_H
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#define TOR_CTASSERT_H
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#include "lib/cc/compat_compiler.h"
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/**
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* CTASSERT(expression)
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*
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* Trigger a compiler error if expression is false.
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*/
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#if __STDC_VERSION__ >= 201112L
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/* If C11 is available, just use _Static_assert. */
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#define CTASSERT(x) _Static_assert(x, #x)
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#else
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/*
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* If C11 is not available, expand __COUNTER__, or __INCLUDE_LEVEL__
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* and __LINE__, or just __LINE__, with an intermediate preprocessor
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* macro CTASSERT_EXPN, and then use CTASSERT_DECL to paste the
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* expansions together into a unique name.
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*
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* We use this name as a typedef of an array type with a positive
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* length if the assertion is true, and a negative length of the
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* assertion is false, which is invalid and hence triggers a compiler
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* error.
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*/
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#if defined(__COUNTER__)
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#define CTASSERT(x) CTASSERT_EXPN(x, c, __COUNTER__)
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#elif defined(__INCLUDE_LEVEL__)
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#define CTASSERT(x) CTASSERT_EXPN(x, __INCLUDE_LEVEL__, __LINE__)
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#else
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#define CTASSERT(x) CTASSERT_EXPN(x, l, __LINE__) /* hope it's unique enough */
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#endif
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#define CTASSERT_EXPN(x, a, b) CTASSERT_DECL(x, a, b)
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#define CTASSERT_DECL(x, a, b) \
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typedef char tor_ctassert_##a##_##b[(x) ? 1 : -1] ATTR_UNUSED
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#endif
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#endif /* !defined(TOR_CTASSERT_H) */
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