/*

** $Id: llimits.h,v 1.69.1.1 2007/12/27 13:02:25 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"

typedef LUAI_UINT32 lu_int32;

typedef LUAI_UMEM lu_mem;

typedef LUAI_MEM l_mem;

/* chars used as small naturals (so that `char' is reserved for characters) */

typedef unsigned char lu_byte;

#define MAX_SIZET	((size_t)(~(size_t)0)-2)

#define MAX_LUMEM	((lu_mem)(~(lu_mem)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

*/

#define IntPoint(p)  ((unsigned int)(lu_mem)(p))

/* type to ensure maximum alignment */

typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;

/* result of a `usual argument conversion' over lua_Number */

typedef LUAI_UACNUMBER l_uacNumber;

/* internal assertions for in-house debugging */

#ifdef lua_assert

#define check_exp(c,e)		(lua_assert(c), (e))

#define api_check(l,e)		lua_assert(e)

#else

#define lua_assert(c)		((void)0)

#define check_exp(c,e)		(e)

#define api_check		luai_apicheck

#endif

#ifndef UNUSED

#define UNUSED(x)	((void)(x))	/* to avoid warnings */

#endif

#ifndef cast

#define cast(t, exp)	((t)(exp))

#endif

#define cast_byte(i)	cast(lu_byte, (i))

#define cast_num(i)	cast(lua_Number, (i))

#define cast_int(i)	cast(int, (i))

/*

** type for virtual-machine instructions

** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)

*/

typedef lu_int32 Instruction;

/* maximum stack for a Lua function */

#define MAXSTACK	250

/* minimum size for the string table (must be power of 2) */

#ifndef MINSTRTABSIZE

#define MINSTRTABSIZE	32

#endif

/* minimum size for string buffer */

#ifndef LUA_MINBUFFER

#define LUA_MINBUFFER	32

#endif

#ifndef lua_lock

#define lua_lock(L)     ((void) 0) 

#define lua_unlock(L)   ((void) 0)

#endif

#ifndef luai_threadyield

#define luai_threadyield(L)     {lua_unlock(L); lua_lock(L);}

#endif

/*

** macro to control inclusion of some hard tests on stack reallocation

*/ 

#ifndef HARDSTACKTESTS

#define condhardstacktests(x)	((void)0)

#else

#define condhardstacktests(x)	x

#endif

#endif