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+/*
+** $Id: llimits.h,v 1.141.1.1 2017/04/19 17:20:42 roberto Exp $
+** Limits, basic types, and some other 'installation-dependent' definitions
+** See Copyright Notice in lua.h
+*/
+
+#ifndef llimits_h
+#define llimits_h
+
+
+#include <limits.h>
+#include <stddef.h>
+
+
+#include "lua.h"
+
+/*
+** 'lu_mem' and 'l_mem' are unsigned/signed integers big enough to count
+** the total memory used by Lua (in bytes). Usually, 'size_t' and
+** 'ptrdiff_t' should work, but we use 'long' for 16-bit machines.
+*/
+#if defined(LUAI_MEM) /* { external definitions? */
+typedef LUAI_UMEM lu_mem;
+typedef LUAI_MEM l_mem;
+#elif LUAI_BITSINT >= 32 /* }{ */
+typedef size_t lu_mem;
+typedef ptrdiff_t l_mem;
+#else /* 16-bit ints */ /* }{ */
+typedef unsigned long lu_mem;
+typedef long l_mem;
+#endif /* } */
+
+
+/* chars used as small naturals (so that 'char' is reserved for characters) */
+typedef unsigned char lu_byte;
+
+
+/* maximum value for size_t */
+#define MAX_SIZET ((size_t)(~(size_t)0))
+
+/* maximum size visible for Lua (must be representable in a lua_Integer */
+#define MAX_SIZE (sizeof(size_t) < sizeof(lua_Integer) ? MAX_SIZET \
+ : (size_t)(LUA_MAXINTEGER))
+
+
+#define MAX_LUMEM ((lu_mem)(~(lu_mem)0))
+
+#define MAX_LMEM ((l_mem)(MAX_LUMEM >> 1))
+
+
+#define MAX_INT INT_MAX /* maximum value of an int */
+
+
+/*
+** conversion of pointer to unsigned integer:
+** this is for hashing only; there is no problem if the integer
+** cannot hold the whole pointer value
+*/
+#define point2uint(p) ((unsigned int)((size_t)(p) & UINT_MAX))
+
+
+
+/* type to ensure maximum alignment */
+#if defined(LUAI_USER_ALIGNMENT_T)
+typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
+#else
+typedef union {
+ lua_Number n;
+ double u;
+ void *s;
+ lua_Integer i;
+ long l;
+} L_Umaxalign;
+#endif
+
+
+
+/* types of 'usual argument conversions' for lua_Number and lua_Integer */
+typedef LUAI_UACNUMBER l_uacNumber;
+typedef LUAI_UACINT l_uacInt;
+
+
+/* internal assertions for in-house debugging */
+#if defined(lua_assert)
+#define check_exp(c,e) (lua_assert(c), (e))
+/* to avoid problems with conditions too long */
+#define lua_longassert(c) ((c) ? (void)0 : lua_assert(0))
+#else
+#define lua_assert(c) ((void)0)
+#define check_exp(c,e) (e)
+#define lua_longassert(c) ((void)0)
+#endif
+
+/*
+** assertion for checking API calls
+*/
+#if !defined(luai_apicheck)
+#define luai_apicheck(l,e) lua_assert(e)
+#endif
+
+#define api_check(l,e,msg) luai_apicheck(l,(e) && msg)
+
+
+/* macro to avoid warnings about unused variables */
+#if !defined(UNUSED)
+#define UNUSED(x) ((void)(x))
+#endif
+
+
+/* type casts (a macro highlights casts in the code) */
+#define cast(t, exp) ((t)(exp))
+
+#define cast_void(i) cast(void, (i))
+#define cast_byte(i) cast(lu_byte, (i))
+#define cast_num(i) cast(lua_Number, (i))
+#define cast_int(i) cast(int, (i))
+#define cast_uchar(i) cast(unsigned char, (i))
+
+
+/* cast a signed lua_Integer to lua_Unsigned */
+#if !defined(l_castS2U)
+#define l_castS2U(i) ((lua_Unsigned)(i))
+#endif
+
+/*
+** cast a lua_Unsigned to a signed lua_Integer; this cast is
+** not strict ISO C, but two-complement architectures should
+** work fine.
+*/
+#if !defined(l_castU2S)
+#define l_castU2S(i) ((lua_Integer)(i))
+#endif
+
+
+/*
+** non-return type
+*/
+#if defined(__GNUC__)
+#define l_noret void __attribute__((noreturn))
+#elif defined(_MSC_VER) && _MSC_VER >= 1200
+#define l_noret void __declspec(noreturn)
+#else
+#define l_noret void
+#endif
+
+
+
+/*
+** maximum depth for nested C calls and syntactical nested non-terminals
+** in a program. (Value must fit in an unsigned short int.)
+*/
+#if !defined(LUAI_MAXCCALLS)
+#define LUAI_MAXCCALLS 200
+#endif
+
+
+
+/*
+** type for virtual-machine instructions;
+** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
+*/
+#if LUAI_BITSINT >= 32
+typedef unsigned int Instruction;
+#else
+typedef unsigned long Instruction;
+#endif
+
+
+
+/*
+** Maximum length for short strings, that is, strings that are
+** internalized. (Cannot be smaller than reserved words or tags for
+** metamethods, as these strings must be internalized;
+** #("function") = 8, #("__newindex") = 10.)
+*/
+#if !defined(LUAI_MAXSHORTLEN)
+#define LUAI_MAXSHORTLEN 40
+#endif
+
+
+/*
+** Initial size for the string table (must be power of 2).
+** The Lua core alone registers ~50 strings (reserved words +
+** metaevent keys + a few others). Libraries would typically add
+** a few dozens more.
+*/
+#if !defined(MINSTRTABSIZE)
+#define MINSTRTABSIZE 128
+#endif
+
+
+/*
+** Size of cache for strings in the API. 'N' is the number of
+** sets (better be a prime) and "M" is the size of each set (M == 1
+** makes a direct cache.)
+*/
+#if !defined(STRCACHE_N)
+#define STRCACHE_N 53
+#define STRCACHE_M 2
+#endif
+
+
+/* minimum size for string buffer */
+#if !defined(LUA_MINBUFFER)
+#define LUA_MINBUFFER 32
+#endif
+
+
+/*
+** macros that are executed whenever program enters the Lua core
+** ('lua_lock') and leaves the core ('lua_unlock')
+*/
+#if !defined(lua_lock)
+#define lua_lock(L) ((void) 0)
+#define lua_unlock(L) ((void) 0)
+#endif
+
+/*
+** macro executed during Lua functions at points where the
+** function can yield.
+*/
+#if !defined(luai_threadyield)
+#define luai_threadyield(L) {lua_unlock(L); lua_lock(L);}
+#endif
+
+
+/*
+** these macros allow user-specific actions on threads when you defined
+** LUAI_EXTRASPACE and need to do something extra when a thread is
+** created/deleted/resumed/yielded.
+*/
+#if !defined(luai_userstateopen)
+#define luai_userstateopen(L) ((void)L)
+#endif
+
+#if !defined(luai_userstateclose)
+#define luai_userstateclose(L) ((void)L)
+#endif
+
+#if !defined(luai_userstatethread)
+#define luai_userstatethread(L,L1) ((void)L)
+#endif
+
+#if !defined(luai_userstatefree)
+#define luai_userstatefree(L,L1) ((void)L)
+#endif
+
+#if !defined(luai_userstateresume)
+#define luai_userstateresume(L,n) ((void)L)
+#endif
+
+#if !defined(luai_userstateyield)
+#define luai_userstateyield(L,n) ((void)L)
+#endif
+
+
+
+/*
+** The luai_num* macros define the primitive operations over numbers.
+*/
+
+/* floor division (defined as 'floor(a/b)') */
+#if !defined(luai_numidiv)
+#define luai_numidiv(L,a,b) ((void)L, l_floor(luai_numdiv(L,a,b)))
+#endif
+
+/* float division */
+#if !defined(luai_numdiv)
+#define luai_numdiv(L,a,b) ((a)/(b))
+#endif
+
+/*
+** modulo: defined as 'a - floor(a/b)*b'; this definition gives NaN when
+** 'b' is huge, but the result should be 'a'. 'fmod' gives the result of
+** 'a - trunc(a/b)*b', and therefore must be corrected when 'trunc(a/b)
+** ~= floor(a/b)'. That happens when the division has a non-integer
+** negative result, which is equivalent to the test below.
+*/
+#if !defined(luai_nummod)
+#define luai_nummod(L,a,b,m) \
+ { (m) = l_mathop(fmod)(a,b); if ((m)*(b) < 0) (m) += (b); }
+#endif
+
+/* exponentiation */
+#if !defined(luai_numpow)
+#define luai_numpow(L,a,b) ((void)L, l_mathop(pow)(a,b))
+#endif
+
+/* the others are quite standard operations */
+#if !defined(luai_numadd)
+#define luai_numadd(L,a,b) ((a)+(b))
+#define luai_numsub(L,a,b) ((a)-(b))
+#define luai_nummul(L,a,b) ((a)*(b))
+#define luai_numunm(L,a) (-(a))
+#define luai_numeq(a,b) ((a)==(b))
+#define luai_numlt(a,b) ((a)<(b))
+#define luai_numle(a,b) ((a)<=(b))
+#define luai_numisnan(a) (!luai_numeq((a), (a)))
+#endif
+
+
+
+
+
+/*
+** macro to control inclusion of some hard tests on stack reallocation
+*/
+#if !defined(HARDSTACKTESTS)
+#define condmovestack(L,pre,pos) ((void)0)
+#else
+/* realloc stack keeping its size */
+#define condmovestack(L,pre,pos) \
+ { int sz_ = (L)->stacksize; pre; luaD_reallocstack((L), sz_); pos; }
+#endif
+
+#if !defined(HARDMEMTESTS)
+#define condchangemem(L,pre,pos) ((void)0)
+#else
+#define condchangemem(L,pre,pos) \
+ { if (G(L)->gcrunning) { pre; luaC_fullgc(L, 0); pos; } }
+#endif
+
+#endif