client/deps/liblua/llimits.h

   1 /*
   2 ** $Id: llimits.h $
   3 ** Limits, basic types, and some other 'installation-dependent' definitions
   4 ** See Copyright Notice in lua.h
   5 */
   6
   7 #ifndef llimits_h
   8 #define llimits_h
   9
  10
  11 #include <limits.h>
  12 #include <stddef.h>
  13
  14
  15 #include "lua.h"
  16
  17
  18 /*
  19 ** 'lu_mem' and 'l_mem' are unsigned/signed integers big enough to count
  20 ** the total memory used by Lua (in bytes). Usually, 'size_t' and
  21 ** 'ptrdiff_t' should work, but we use 'long' for 16-bit machines.
  22 */
  23 #if defined(LUAI_MEM)           /* { external definitions? */
  24 typedef LUAI_UMEM lu_mem;
  25 typedef LUAI_MEM l_mem;
  26 #elif LUAI_IS32INT      /* }{ */
  27 typedef size_t lu_mem;
  28 typedef ptrdiff_t l_mem;
  29 #else  /* 16-bit ints */        /* }{ */
  30 typedef unsigned long lu_mem;
  31 typedef long l_mem;
  32 #endif                          /* } */
  33
  34
  35 /* chars used as small naturals (so that 'char' is reserved for characters) */
  36 typedef unsigned char lu_byte;
  37 typedef signed char ls_byte;
  38
  39
  40 /* maximum value for size_t */
  41 #define MAX_SIZET       ((size_t)(~(size_t)0))
  42
  43 /* maximum size visible for Lua (must be representable in a lua_Integer) */
  44 #define MAX_SIZE        (sizeof(size_t) < sizeof(lua_Integer) ? MAX_SIZET \
  45                           : (size_t)(LUA_MAXINTEGER))
  46
  47
  48 #define MAX_LUMEM       ((lu_mem)(~(lu_mem)0))
  49
  50 #define MAX_LMEM        ((l_mem)(MAX_LUMEM >> 1))
  51
  52
  53 #define MAX_INT         INT_MAX  /* maximum value of an int */
  54
  55
  56 /*
  57 ** floor of the log2 of the maximum signed value for integral type 't'.
  58 ** (That is, maximum 'n' such that '2^n' fits in the given signed type.)
  59 */
  60 #define log2maxs(t)     (sizeof(t) * 8 - 2)
  61
  62
  63 /*
  64 ** test whether an unsigned value is a power of 2 (or zero)
  65 */
  66 #define ispow2(x)       (((x) & ((x) - 1)) == 0)
  67
  68
  69 /* number of chars of a literal string without the ending \0 */
  70 #define LL(x)   (sizeof(x)/sizeof(char) - 1)
  71
  72
  73 /*
  74 ** conversion of pointer to unsigned integer: this is for hashing only;
  75 ** there is no problem if the integer cannot hold the whole pointer
  76 ** value. (In strict ISO C this may cause undefined behavior, but no
  77 ** actual machine seems to bother.)
  78 */
  79 #if !defined(LUA_USE_C89) && defined(__STDC_VERSION__) && \
  80     __STDC_VERSION__ >= 199901L
  81 #include <stdint.h>
  82 #if defined(UINTPTR_MAX)  /* even in C99 this type is optional */
  83 #define L_P2I   uintptr_t
  84 #else  /* no 'intptr'? */
  85 #define L_P2I   uintmax_t  /* use the largest available integer */
  86 #endif
  87 #else  /* C89 option */
  88 #define L_P2I   size_t
  89 #endif
  90
  91 #define point2uint(p)   ((unsigned int)((L_P2I)(p) & UINT_MAX))
  92
  93
  94
  95 /* types of 'usual argument conversions' for lua_Number and lua_Integer */
  96 typedef LUAI_UACNUMBER l_uacNumber;
  97 typedef LUAI_UACINT l_uacInt;
  98
  99
 100 /*
 101 ** Internal assertions for in-house debugging
 102 */
 103 #if defined LUAI_ASSERT
 104 #undef NDEBUG
 105 #include <assert.h>
 106 #define lua_assert(c)           assert(c)
 107 #endif
 108
 109 #if defined(lua_assert)
 110 #define check_exp(c,e)          (lua_assert(c), (e))
 111 /* to avoid problems with conditions too long */
 112 #define lua_longassert(c)       ((c) ? (void)0 : lua_assert(0))
 113 #else
 114 #define lua_assert(c)           ((void)0)
 115 #define check_exp(c,e)          (e)
 116 #define lua_longassert(c)       ((void)0)
 117 #endif
 118
 119 /*
 120 ** assertion for checking API calls
 121 */
 122 #if !defined(luai_apicheck)
 123 #define luai_apicheck(l,e)      ((void)l, lua_assert(e))
 124 #endif
 125
 126 #define api_check(l,e,msg)      luai_apicheck(l,(e) && msg)
 127
 128
 129 /* macro to avoid warnings about unused variables */
 130 #if !defined(UNUSED)
 131 #define UNUSED(x)       ((void)(x))
 132 #endif
 133
 134
 135 /* type casts (a macro highlights casts in the code) */
 136 #define cast(t, exp)    ((t)(exp))
 137
 138 #define cast_void(i)    cast(void, (i))
 139 #define cast_voidp(i)   cast(void *, (i))
 140 #define cast_num(i)     cast(lua_Number, (i))
 141 #define cast_int(i)     cast(int, (i))
 142 #define cast_uint(i)    cast(unsigned int, (i))
 143 #define cast_byte(i)    cast(lu_byte, (i))
 144 #define cast_uchar(i)   cast(unsigned char, (i))
 145 #define cast_char(i)    cast(char, (i))
 146 #define cast_charp(i)   cast(char *, (i))
 147 #define cast_sizet(i)   cast(size_t, (i))
 148
 149
 150 /* cast a signed lua_Integer to lua_Unsigned */
 151 #if !defined(l_castS2U)
 152 #define l_castS2U(i)    ((lua_Unsigned)(i))
 153 #endif
 154
 155 /*
 156 ** cast a lua_Unsigned to a signed lua_Integer; this cast is
 157 ** not strict ISO C, but two-complement architectures should
 158 ** work fine.
 159 */
 160 #if !defined(l_castU2S)
 161 #define l_castU2S(i)    ((lua_Integer)(i))
 162 #endif
 163
 164
 165 /*
 166 ** non-return type
 167 */
 168 #if !defined(l_noret)
 169
 170 #if defined(__GNUC__)
 171 #define l_noret         void __attribute__((noreturn))
 172 #elif defined(_MSC_VER) && _MSC_VER >= 1200
 173 #define l_noret         void __declspec(noreturn)
 174 #else
 175 #define l_noret         void
 176 #endif
 177
 178 #endif
 179
 180
 181 /*
 182 ** Inline functions
 183 */
 184 #if !defined(LUA_USE_C89)
 185 #define l_inline        inline
 186 #elif defined(__GNUC__)
 187 #define l_inline        __inline__
 188 #else
 189 #define l_inline        /* empty */
 190 #endif
 191
 192 #define l_sinline       static l_inline
 193
 194
 195 /*
 196 ** type for virtual-machine instructions;
 197 ** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
 198 */
 199 #if LUAI_IS32INT
 200 typedef unsigned int l_uint32;
 201 #else
 202 typedef unsigned long l_uint32;
 203 #endif
 204
 205 typedef l_uint32 Instruction;
 206
 207
 208
 209 /*
 210 ** Maximum length for short strings, that is, strings that are
 211 ** internalized. (Cannot be smaller than reserved words or tags for
 212 ** metamethods, as these strings must be internalized;
 213 ** #("function") = 8, #("__newindex") = 10.)
 214 */
 215 #if !defined(LUAI_MAXSHORTLEN)
 216 #define LUAI_MAXSHORTLEN        40
 217 #endif
 218
 219
 220 /*
 221 ** Initial size for the string table (must be power of 2).
 222 ** The Lua core alone registers ~50 strings (reserved words +
 223 ** metaevent keys + a few others). Libraries would typically add
 224 ** a few dozens more.
 225 */
 226 #if !defined(MINSTRTABSIZE)
 227 #define MINSTRTABSIZE   128
 228 #endif
 229
 230
 231 /*
 232 ** Size of cache for strings in the API. 'N' is the number of
 233 ** sets (better be a prime) and "M" is the size of each set (M == 1
 234 ** makes a direct cache.)
 235 */
 236 #if !defined(STRCACHE_N)
 237 #define STRCACHE_N              53
 238 #define STRCACHE_M              2
 239 #endif
 240
 241
 242 /* minimum size for string buffer */
 243 #if !defined(LUA_MINBUFFER)
 244 #define LUA_MINBUFFER   32
 245 #endif
 246
 247
 248 /*
 249 ** Maximum depth for nested C calls, syntactical nested non-terminals,
 250 ** and other features implemented through recursion in C. (Value must
 251 ** fit in a 16-bit unsigned integer. It must also be compatible with
 252 ** the size of the C stack.)
 253 */
 254 #if !defined(LUAI_MAXCCALLS)
 255 #define LUAI_MAXCCALLS          200
 256 #endif
 257
 258
 259 /*
 260 ** macros that are executed whenever program enters the Lua core
 261 ** ('lua_lock') and leaves the core ('lua_unlock')
 262 */
 263 #if !defined(lua_lock)
 264 #define lua_lock(L)     ((void) 0)
 265 #define lua_unlock(L)   ((void) 0)
 266 #endif
 267
 268 /*
 269 ** macro executed during Lua functions at points where the
 270 ** function can yield.
 271 */
 272 #if !defined(luai_threadyield)
 273 #define luai_threadyield(L)     {lua_unlock(L); lua_lock(L);}
 274 #endif
 275
 276
 277 /*
 278 ** these macros allow user-specific actions when a thread is
 279 ** created/deleted/resumed/yielded.
 280 */
 281 #if !defined(luai_userstateopen)
 282 #define luai_userstateopen(L)           ((void)L)
 283 #endif
 284
 285 #if !defined(luai_userstateclose)
 286 #define luai_userstateclose(L)          ((void)L)
 287 #endif
 288
 289 #if !defined(luai_userstatethread)
 290 #define luai_userstatethread(L,L1)      ((void)L)
 291 #endif
 292
 293 #if !defined(luai_userstatefree)
 294 #define luai_userstatefree(L,L1)        ((void)L)
 295 #endif
 296
 297 #if !defined(luai_userstateresume)
 298 #define luai_userstateresume(L,n)       ((void)L)
 299 #endif
 300
 301 #if !defined(luai_userstateyield)
 302 #define luai_userstateyield(L,n)        ((void)L)
 303 #endif
 304
 305
 306
 307 /*
 308 ** The luai_num* macros define the primitive operations over numbers.
 309 */
 310
 311 /* floor division (defined as 'floor(a/b)') */
 312 #if !defined(luai_numidiv)
 313 #define luai_numidiv(L,a,b)     ((void)L, l_floor(luai_numdiv(L,a,b)))
 314 #endif
 315
 316 /* float division */
 317 #if !defined(luai_numdiv)
 318 #define luai_numdiv(L,a,b)      ((a)/(b))
 319 #endif
 320
 321 /*
 322 ** modulo: defined as 'a - floor(a/b)*b'; the direct computation
 323 ** using this definition has several problems with rounding errors,
 324 ** so it is better to use 'fmod'. 'fmod' gives the result of
 325 ** 'a - trunc(a/b)*b', and therefore must be corrected when
 326 ** 'trunc(a/b) ~= floor(a/b)'. That happens when the division has a
 327 ** non-integer negative result: non-integer result is equivalent to
 328 ** a non-zero remainder 'm'; negative result is equivalent to 'a' and
 329 ** 'b' with different signs, or 'm' and 'b' with different signs
 330 ** (as the result 'm' of 'fmod' has the same sign of 'a').
 331 */
 332 #if !defined(luai_nummod)
 333 #define luai_nummod(L,a,b,m)  \
 334   { (void)L; (m) = l_mathop(fmod)(a,b); \
 335     if (((m) > 0) ? (b) < 0 : ((m) < 0 && (b) > 0)) (m) += (b); }
 336 #endif
 337
 338 /* exponentiation */
 339 #if !defined(luai_numpow)
 340 #define luai_numpow(L,a,b)  \
 341   ((void)L, (b == 2) ? (a)*(a) : l_mathop(pow)(a,b))
 342 #endif
 343
 344 /* the others are quite standard operations */
 345 #if !defined(luai_numadd)
 346 #define luai_numadd(L,a,b)      ((a)+(b))
 347 #define luai_numsub(L,a,b)      ((a)-(b))
 348 #define luai_nummul(L,a,b)      ((a)*(b))
 349 #define luai_numunm(L,a)        (-(a))
 350 #define luai_numeq(a,b)         ((a)==(b))
 351 #define luai_numlt(a,b)         ((a)<(b))
 352 #define luai_numle(a,b)         ((a)<=(b))
 353 #define luai_numgt(a,b)         ((a)>(b))
 354 #define luai_numge(a,b)         ((a)>=(b))
 355 #define luai_numisnan(a)        (!luai_numeq((a), (a)))
 356 #endif
 357
 358
 359
 360
 361
 362 /*
 363 ** macro to control inclusion of some hard tests on stack reallocation
 364 */
 365 #if !defined(HARDSTACKTESTS)
 366 #define condmovestack(L,pre,pos)        ((void)0)
 367 #else
 368 /* realloc stack keeping its size */
 369 #define condmovestack(L,pre,pos)  \
 370   { int sz_ = stacksize(L); pre; luaD_reallocstack((L), sz_, 0); pos; }
 371 #endif
 372
 373 #if !defined(HARDMEMTESTS)
 374 #define condchangemem(L,pre,pos)        ((void)0)
 375 #else
 376 #define condchangemem(L,pre,pos)  \
 377         { if (gcrunning(G(L))) { pre; luaC_fullgc(L, 0); pos; } }
 378 #endif
 379
 380 #endif