/
vdef.h
271 lines (227 loc) · 8.07 KB
/
vdef.h
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/*-
* Copyright (c) 2006 Verdens Gang AS
* Copyright (c) 2012 Fastly Inc
* Copyright (c) 2006-2015 Varnish Software AS
* All rights reserved.
*
* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
* Author: Rogier 'DocWilco' Mulhuijzen <rogier@fastly.com>
*
* Inspired by FreeBSD's <sys/cdefs.h>
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Names of the form "v_[a-z_]*_" is reserved for this file.
*
* This file should always be the first non <...> include in a .c file.
*/
#include <stddef.h>
#ifdef VDEF_H_INCLUDED
# error "vdef.h included multiple times"
#endif
#define VDEF_H_INCLUDED
/* Safe printf into a fixed-size buffer */
#define bprintf(buf, fmt, ...) \
do { \
int ibprintf; \
ibprintf = snprintf(buf, sizeof buf, fmt, __VA_ARGS__); \
assert(ibprintf >= 0 && ibprintf < (int)sizeof buf); \
} while (0)
/* Safe printf into a fixed-size buffer */
#define vbprintf(buf, fmt, ap) \
do { \
int ivbprintf; \
ivbprintf = vsnprintf(buf, sizeof buf, fmt, ap); \
assert(ivbprintf >= 0 && ivbprintf < (int)sizeof buf); \
} while (0)
/* Safe strcpy into a fixed-size buffer */
#define bstrcpy(dst, src) \
do { \
assert(strlen(src) + 1 <= sizeof (dst)); \
strcpy((dst), (src)); \
} while (0)
// TODO #define strcpy BANNED
// TODO then revert 0fa4baead49f0a45f68d3db0b7743c5e4e93ad4d
// TODO and replace with flexelint exception
/* Close and discard filedescriptor */
#define closefd(fdp) \
do { \
assert(*(fdp) >= 0); \
AZ(close(*(fdp))); \
*(fdp) = -1; \
} while (0)
#if !defined(__has_feature)
# define __has_feature(x) 0
#endif
#ifndef __GNUC_PREREQ__
# if defined __GNUC__ && defined __GNUC_MINOR__
# define __GNUC_PREREQ__(maj, min) \
(__GNUC__ > (maj) || (__GNUC__ == (maj) && __GNUC_MINOR__ >= (min)))
# else
# define __GNUC_PREREQ__(maj, min) 0
# endif
#endif
#if __GNUC_PREREQ__(2, 95) || defined(__INTEL_COMPILER)
# define v_printflike_(f,a) __attribute__((format(printf, f, a)))
#else
# define v_printflike_(f,a)
#endif
#define v_noreturn_ __attribute__((__noreturn__))
#ifdef __GNUC__
# define v_deprecated_ __attribute__((deprecated))
#else
# define v_deprecated_
#endif
#if __GNUC_PREREQ__(4,4) // added 2008-07-23
# define v_dont_optimize __attribute__((optimize("O")))
#else
# define v_dont_optimize
#endif
#ifdef HAVE___GCOV_FLUSH
# define v_gcov_flush() __gcov_flush()
int __gcov_flush(void);
#elif defined HAVE___GCOV_DUMP
# define v_gcov_flush() __gcov_dump()
void __gcov_dump(void);
#elif defined HAVE___LLVM_GCOV_FLUSH
# define v_gcov_flush() __llvm_gcov_flush()
int __llvm_gcov_flush(void);
#else
# define v_gcov_flush() do { } while (0)
#endif
/*********************************************************************
* Fundamental numerical limits
* These limits track RFC8941
* We use hex notation because 999999999999.999 is not perfectly
* representable in ieee64 doubles.
*/
#define VRT_INTEGER_MAX 999999999999999
#define VRT_INTEGER_MIN -999999999999999
#define VRT_DECIMAL_MAX 0x1.d1a94a1fffff8p+39
#define VRT_DECIMAL_MIN -0x1.d1a94a1fffff8p+39
/*********************************************************************
* Pointer alignment magic
*/
#if defined(__sparc__)
/* NB: Overbroad test for 32bit userland on 64bit SPARC cpus. */
# define PALGN (sizeof(double) - 1) /* size of alignment */
#else
# define PALGN (sizeof(void *) - 1) /* size of alignment */
#endif
#define PAOK(p) (((uintptr_t)(p) & PALGN) == 0) /* is aligned */
#define PRNDDN(p) ((uintptr_t)(p) & ~PALGN) /* Round down */
#define PRNDUP(p) (((uintptr_t)(p) + PALGN) & ~PALGN) /* Round up */
/*********************************************************************
* To be used as little as possible to wash off const/volatile etc.
*/
#define TRUST_ME(ptr) ((void*)(uintptr_t)(ptr))
/**********************************************************************
* Generic power-2 rounding macros
*/
#define PWR2(x) ((((x)-1UL)&(x))==0) /* Is a power of two */
#define RDN2(x, y) ((x)&(~((uintptr_t)(y)-1UL))) /* PWR2(y) true */
#define RUP2(x, y) (((x)+((y)-1))&(~((uintptr_t)(y)-1UL))) /* PWR2(y) true */
/**********************************************************************
* Find the minimum or maximum values.
* Only evaluate the expression once and perform type checking.
*/
/* ref: https://stackoverflow.com/a/17624752 */
#define VINDIRECT(a, b, c) a ## b ## c
#define VCOMBINE(a, b, c) VINDIRECT(a, b, c)
#if defined(__COUNTER__)
# define VUNIQ_NAME(base) VCOMBINE(base, __LINE__, __COUNTER__)
#else
# define VUNIQ_NAME(base) VCOMBINE(base, __LINE__, 0)
#endif
#ifdef _lint
#define typeof(x) __typeof__(x)
#endif
/* ref: https://gcc.gnu.org/onlinedocs/gcc/Typeof.html */
#define _vtake(op, ta, tb, a, b, _va, _vb) \
({ \
ta _va = (a); \
tb _vb = (b); \
(void)(&_va == &_vb); \
_va op _vb ? _va : _vb; \
})
#define opmin <
#define opmax >
#define vtake(n, ta, tb, a, b) _vtake(op ## n, ta, tb, a, b, \
VUNIQ_NAME(_v ## n ## A), VUNIQ_NAME(_v ## n ## B))
#define vmin(a, b) vtake(min, typeof(a), typeof(b), a, b)
#define vmax(a, b) vtake(max, typeof(a), typeof(b), a, b)
#define vmin_t(type, a, b) vtake(min, type, type, a, b)
#define vmax_t(type, a, b) vtake(max, type, type, a, b)
/**********************************************************************
* Clamp the value between two limits.
*/
#define vlimit(a, l, u) vmax((l), vmin((a), (u)))
#define vlimit_t(type, a, l, u) vmax_t(type, (l), vmin_t(type, (a), (u)))
/**********************************************************************
* FlexeLint and compiler shutuppery
*/
/*
* In OO-light situations, functions have to match their prototype
* even if that means not const'ing a const'able argument.
* The typedef should be specified as argument to the macro.
*/
#define v_matchproto_(xxx) /*lint --e{818} */
/*
* State variables may change value before we have considered the
* previous value
*/
#define v_statevariable_(varname) varname /*lint -esym(838,varname) */
#ifdef __SUNPRO_C
# define NEEDLESS(s) {}
#else
# define NEEDLESS(s) s
#endif
#if __GNUC_PREREQ__(2, 7)
# define v_unused_ __attribute__((__unused__))
#else
# define v_unused_
#endif
#if __GNUC_PREREQ__(4, 3) || defined(__clang__)
# define v_cold_ __attribute__((cold))
#else
# define v_cold_
#endif
/* VTIM API overhaul WIP */
typedef double vtim_mono;
typedef double vtim_real;
typedef double vtim_dur;
/**********************************************************************
* txt (vas.h needed for the macros)
*/
typedef struct {
const char *b;
const char *e;
} txt;
#define Tcheck(t) do { (void)pdiff((t).b, (t).e); } while (0)
#define Tlen(t) (pdiff((t).b, (t).e))
#define Tstr(s) (/*lint -e(446)*/ (txt){(s), (s) + strlen(s)})
#define Tstrcmp(t, s) (strncmp((t).b, (s), Tlen(t)))
/* #3020 dummy definitions until PR is merged*/
#define LIKELY(x) (x)
#define UNLIKELY(x) (x)