mirror of https://github.com/lua/lua.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
119 lines
2.6 KiB
119 lines
2.6 KiB
/*
|
|
** $Id: llimits.h,v 1.1 2001/11/29 22:14:34 rieru Exp rieru $
|
|
** 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"
|
|
|
|
|
|
/*
|
|
** 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
|
|
|
|
|
|
/*
|
|
** the following types define integer types for values that may not
|
|
** fit in a `small int' (16 bits), but may waste space in a
|
|
** `large long' (64 bits). The current definitions should work in
|
|
** 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;
|
|
|
|
/* an unsigned integer big enough to count the total memory used by Lua; */
|
|
/* it should be at least as large as size_t */
|
|
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;
|
|
|
|
|
|
#define MAX_SIZET ((size_t)(~(size_t)0)-2)
|
|
|
|
|
|
#define MAX_INT (INT_MAX-2) /* maximum value of an int (-2 for safety) */
|
|
|
|
/*
|
|
** conversion of pointer to integer
|
|
** this is for hashing only; there is no problem if the integer
|
|
** cannot hold the whole pointer value
|
|
** (the shift removes bits that are usually 0 because of alignment)
|
|
*/
|
|
#define IntPoint(p) ((((lu_hash)(p)) >> 4) ^ (lu_hash)(p))
|
|
|
|
|
|
|
|
|
|
/* 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; };
|
|
|
|
|
|
|
|
/*
|
|
** type for virtual-machine instructions
|
|
** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
|
|
*/
|
|
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
|
|
|
|
|
|
/* maximum number of upvalues per function */
|
|
#ifndef MAXUPVALUES
|
|
#define MAXUPVALUES 32
|
|
#endif
|
|
|
|
|
|
/* maximum number of parameters in a function */
|
|
#ifndef MAXPARAMS
|
|
#define MAXPARAMS 100 /* arbitrary limit (<MAXLOCALS) */
|
|
#endif
|
|
|
|
|
|
/* number of list items to accumulate before a SETLIST instruction */
|
|
/* (must be a power of 2) */
|
|
#define LFIELDS_PER_FLUSH 64
|
|
|
|
|
|
|
|
#endif
|
|
|