lua/llimits.h

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/*
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** $Id: llimits.h,v 1.1 2001/11/29 22:14:34 rieru Exp rieru $
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** Limits, basic types, and some other `installation-dependent' definitions
** See Copyright Notice in lua.h
*/
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#ifndef llimits_h
#define llimits_h
#include <limits.h>
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#include <stddef.h>
#include "lua.h"
/*
** try to find number of bits in an integer
*/
#ifndef BITS_INT
/* avoid overflows in comparison */
#if INT_MAX-20 < 32760
#define BITS_INT 16
#else
#if INT_MAX > 2147483640L
/* machine has at least 32 bits */
#define BITS_INT 32
#else
#error "you must define BITS_INT with number of bits in an integer"
#endif
#endif
#endif
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/*
** the following types define integer types for values that may not
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** fit in a `small int' (16 bits), but may waste space in a
** `large long' (64 bits). The current definitions should work in
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** any machine, but may not be optimal.
*/
/* an unsigned integer to hold hash values */
typedef unsigned int lu_hash;
/* its signed equivalent */
typedef int ls_hash;
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/* an unsigned integer big enough to count the total memory used by Lua; */
/* it should be at least as large as size_t */
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typedef unsigned long lu_mem;
/* an integer big enough to count the number of strings in use */
typedef long ls_nstr;
/* chars used as small naturals (so that `char' is reserved for characteres) */
typedef unsigned char lu_byte;
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#define MAX_SIZET ((size_t)(~(size_t)0)-2)
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#define MAX_INT (INT_MAX-2) /* maximum value of an int (-2 for safety) */
/*
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** conversion of pointer to integer
** this is for hashing only; there is no problem if the integer
** cannot hold the whole pointer value
*/
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#define IntPoint(p) ((lu_hash)(p))
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/* type to ensure maximum alignment */
#ifndef LUSER_ALIGNMENT_T
#define LUSER_ALIGNMENT_T double
#endif
union L_Umaxalign { LUSER_ALIGNMENT_T u; void *s; long l; };
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/*
** type for virtual-machine instructions
** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
*/
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typedef unsigned long Instruction;
/* maximum stack for a Lua function */
#define MAXSTACK 250
/* maximum number of local variables */
#ifndef MAXLOCALS
#define MAXLOCALS 200 /* arbitrary limit (<MAXSTACK) */
#endif
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/* maximum number of upvalues per function */
#ifndef MAXUPVALUES
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#define MAXUPVALUES 32
#endif
/* maximum number of parameters in a function */
#ifndef MAXPARAMS
#define MAXPARAMS 100 /* arbitrary limit (<MAXLOCALS) */
#endif
#endif