apt-pkg/contrib/macros.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    Macros Header - Various useful macro definitions
   6
   7    This source is placed in the Public Domain, do with it what you will
   8    It was originally written by Brian C. White.
   9
  10    ##################################################################### */
  11                                                                         /*}}}*/
  12 // Private header
  13 #ifndef MACROS_H
  14 #define MACROS_H
  15
  16 // MIN_VAL(SINT16) will return -0x8000 and MAX_VAL(SINT16) = 0x7FFF
  17 #define MIN_VAL(t)      (((t)(-1) > 0) ? (t)( 0) : (t)(((1L<<(sizeof(t)*8-1))  )))
  18 #define MAX_VAL(t)      (((t)(-1) > 0) ? (t)(-1) : (t)(((1L<<(sizeof(t)*8-1))-1)))
  19
  20 // Min/Max functions
  21 #if !defined(MIN)
  22 #if defined(__HIGHC__)
  23 #define MIN(x,y) _min(x,y)
  24 #define MAX(x,y) _max(x,y)
  25 #endif
  26
  27 // GNU C++ has a min/max operator <coolio>
  28 #if defined(__GNUG__)
  29 #define MIN(A,B) ((A) <? (B))
  30 #define MAX(A,B) ((A) >? (B))
  31 #endif
  32
  33 /* Templates tend to mess up existing code that uses min/max because of the
  34    strict matching requirements */
  35 #if !defined(MIN)
  36 #define MIN(A,B) ((A) < (B)?(A):(B))
  37 #define MAX(A,B) ((A) > (B)?(A):(B))
  38 #endif
  39 #endif
  40
  41 /* Bound functions, bound will return the value b within the limits a-c
  42    bounv will change b so that it is within the limits of a-c. */
  43 #define _bound(a,b,c) MIN(c,MAX(b,a))
  44 #define _boundv(a,b,c) b = _bound(a,b,c)
  45 #define ABS(a) (((a) < (0)) ?-(a) : (a))
  46
  47 /* Useful count macro, use on an array of things and it will return the
  48    number of items in the array */
  49 #define _count(a) (sizeof(a)/sizeof(a[0]))
  50
  51 // Flag Macros
  52 #define FLAG(f)                 (1L << (f))
  53 #define SETFLAG(v,f)    ((v) |= FLAG(f))
  54 #define CLRFLAG(v,f)    ((v) &=~FLAG(f))
  55 #define CHKFLAG(v,f)    ((v) &  FLAG(f) ? true : false)
  56
  57 #ifdef __GNUC__
  58 #define APT_GCC_VERSION (__GNUC__ << 8 | __GNUC_MINOR__)
  59 #else
  60 #define APT_GCC_VERSION 0
  61 #endif
  62
  63 /* likely() and unlikely() can be used to mark boolean expressions
  64    as (not) likely true which will help the compiler to optimise */
  65 #if APT_GCC_VERSION >= 0x0300
  66         #define likely(x)       __builtin_expect (!!(x), 1)
  67         #define unlikely(x)     __builtin_expect (!!(x), 0)
  68 #else
  69         #define likely(x)       (x)
  70         #define unlikely(x)     (x)
  71 #endif
  72
  73 #if APT_GCC_VERSION >= 0x0300
  74         #define APT_DEPRECATED  __attribute__ ((deprecated))
  75         #define APT_CONST       __attribute__((const))
  76         #define APT_PURE        __attribute__((pure))
  77         #define APT_NORETURN    __attribute__((noreturn))
  78         #define APT_PRINTF(n)   __attribute__((format(printf, n, n + 1)))
  79 #else
  80         #define APT_DEPRECATED
  81         #define APT_CONST
  82         #define APT_PURE
  83         #define APT_NORETURN
  84         #define APT_PRINTF(n)
  85 #endif
  86
  87 #if APT_GCC_VERSION > 0x0302
  88         #define APT_NONNULL(...)        __attribute__((nonnull(__VA_ARGS__)))
  89         #define APT_MUSTCHECK           __attribute__((warn_unused_result))
  90 #else
  91         #define APT_NONNULL(...)
  92         #define APT_REQRET
  93 #endif
  94
  95 #if APT_GCC_VERSION >= 0x0400
  96         #define APT_SENTINEL    __attribute__((sentinel))
  97         #define APT_PUBLIC __attribute__ ((visibility ("default")))
  98         #define APT_HIDDEN __attribute__ ((visibility ("hidden")))
  99 #else
 100         #define APT_SENTINEL
 101         #define APT_PUBLIC
 102         #define APT_HIDDEN
 103 #endif
 104
 105 // cold functions are unlikely() to be called
 106 #if APT_GCC_VERSION >= 0x0403
 107         #define APT_COLD        __attribute__ ((__cold__))
 108         #define APT_HOT         __attribute__ ((__hot__))
 109 #else
 110         #define APT_COLD
 111         #define APT_HOT
 112 #endif
 113
 114 #ifndef APT_10_CLEANER_HEADERS
 115 #if APT_GCC_VERSION >= 0x0300
 116         #define __must_check    __attribute__ ((warn_unused_result))
 117         #define __deprecated    __attribute__ ((deprecated))
 118         #define __attrib_const  __attribute__ ((__const__))
 119         #define __like_printf(n)        __attribute__((format(printf, n, n + 1)))
 120 #else
 121         #define __must_check    /* no warn_unused_result */
 122         #define __deprecated    /* no deprecated */
 123         #define __attrib_const  /* no const attribute */
 124         #define __like_printf(n)        /* no like-printf */
 125 #endif
 126 #if APT_GCC_VERSION >= 0x0403
 127         #define __cold  __attribute__ ((__cold__))
 128         #define __hot   __attribute__ ((__hot__))
 129 #else
 130         #define __cold  /* no cold marker */
 131         #define __hot   /* no hot marker */
 132 #endif
 133 #endif
 134
 135 // These lines are extracted by the makefiles and the buildsystem
 136 // Increasing MAJOR or MINOR results in the need of recompiling all
 137 // reverse-dependencies of libapt-pkg against the new SONAME.
 138 // Non-ABI-Breaks should only increase RELEASE number.
 139 // See also buildlib/libversion.mak
 140 #define APT_PKG_MAJOR 4
 141 #define APT_PKG_MINOR 12
 142 #define APT_PKG_RELEASE 0
 143
 144 #endif