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/*

** $Id: llimits.h,v 1.84 2010/11/08 16:33:20 roberto Exp $

** Limits, basic types, and some other `installation-dependent' definitions

** See Copyright Notice in lua.h

*/

#ifndef llimits_h

#define llimits_h

#include 

#include 

#include "lua.h"

typedef unsigned LUA_INT32 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 MIN_LMEM	((l_mem)~((~(lu_mem)0)>>1))

#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 */

#if !defined(LUAI_USER_ALIGNMENT_T)

#define LUAI_USER_ALIGNMENT_T	union { double u; void *s; long l; }

#endif

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 */

#if defined(lua_assert)

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

#else

#define lua_assert(c)		/* empty */

#define check_exp(c,e)		(e)

#endif

/*

** assertion for checking API calls

*/

#if defined(LUA_USE_APICHECK)

#include 

#define luai_apicheck(L,e)	{ (void)L; assert(e); }

#elif !defined(luai_apicheck)

#define luai_apicheck(L,e)	lua_assert(e)

#endif

#define api_check(l,e,msg)	luai_apicheck(l,(e) && msg)

#if !defined(UNUSED)

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

#endif

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

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

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

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

/*

** 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

/*

** maximum number of upvalues in a closure (both C and Lua). (Value

** must fit in an unsigned char.)

*/

#define MAXUPVAL	UCHAR_MAX

/*

** 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) */

#if !defined(MINSTRTABSIZE)

#define MINSTRTABSIZE	32

#endif

/* minimum size for string buffer */

#if !defined(LUA_MINBUFFER)

#define LUA_MINBUFFER	32

#endif

#if !defined(lua_lock)

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

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

#endif

#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

/*

** lua_number2int is a macro to convert lua_Number to int.

** lua_number2integer is a macro to convert lua_Number to lua_Integer.

** lua_number2unsigned is a macro to convert a lua_Number to a lua_Unsigned.

** lua_unsigned2number is a macro to convert a lua_Unsigned to a lua_Number.

*/

#if defined(MS_ASMTRICK)	/* { */

/* trick with Microsoft assembler for X86 */

#define lua_number2int(i,n)  __asm {__asm fld n   __asm fistp i}

#define lua_number2integer(i,n)		lua_number2int(i, n)

#define lua_number2unsigned(i,n)  \

  {__int64 l; __asm {__asm fld n   __asm fistp l} i = (unsigned int)l;}

#elif defined(LUA_IEEE754TRICK)		/* }{ */

/* the next trick should work on any machine using IEEE754 with

   a 32-bit integer type */

union luai_Cast { double l_d; LUA_INT32 l_p[2]; };

#if !defined(LUA_IEEEENDIAN)	/* { */

#define LUAI_EXTRAIEEE	\

  static const union luai_Cast ieeeendian = {-(33.0 + 6755399441055744.0)};

#define LUA_IEEEENDIAN		(ieeeendian.l_p[1] == 33)

#else

#define LUAI_EXTRAIEEE		/* empty */

#endif				/* } */

#define lua_number2int32(i,n,t) \

  { LUAI_EXTRAIEEE \

    volatile union luai_Cast u; u.l_d = (n) + 6755399441055744.0; \

    (i) = (t)u.l_p[LUA_IEEEENDIAN]; }

#define lua_number2int(i,n)		lua_number2int32(i, n, int)

#define lua_number2integer(i,n)		lua_number2int32(i, n, lua_Integer)

#define lua_number2unsigned(i,n)	lua_number2int32(i, n, lua_Unsigned)

#endif				/* } */

/* the following definitions always work, but may be slow */

#if !defined(lua_number2int)

#define lua_number2int(i,n)	((i)=(int)(n))

#endif

#if !defined(lua_number2integer)

#define lua_number2integer(i,n)	((i)=(lua_Integer)(n))

#endif

#if !defined(lua_number2unsigned)	/* { */

/* the following definition assures proper modulo behavior */

#if defined(LUA_NUMBER_DOUBLE)

#include 

#define SUPUNSIGNED	((lua_Number)(~(lua_Unsigned)0) + 1)

#define lua_number2unsigned(i,n)  \

	((i)=(lua_Unsigned)((n) - floor((n)/SUPUNSIGNED)*SUPUNSIGNED))

#else

#define lua_number2unsigned(i,n)	((i)=(lua_Unsigned)(n))

#endif

#endif				/* } */

#if !defined(lua_unsigned2number)

/* on several machines, coercion from unsigned to double is slow,

   so it may be worth to avoid */

#define lua_unsigned2number(u)  \

    (((u) <= (lua_Unsigned)INT_MAX) ? (lua_Number)(int)(u) : (lua_Number)(u))

#endif

/*

** luai_hashnum is a macro do hash a lua_Number value into an integer.

** The hash must be deterministic and give reasonable values for

** both small and large values (outside the range of integers).

** It is used only in ltable.c.

*/

#if !defined(luai_hashnum)	/* { */

#include 

#include 

#define luai_hashnum(i,n) { int e;  \

  n = frexp(n, &e) * (lua_Number)(INT_MAX - DBL_MAX_EXP);  \

  lua_number2int(i, n); i += e; }

#endif						/* } */

/*

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

*/

#if !defined(HARDSTACKTESTS)

#define condmovestack(L)	((void)0)

#else

/* realloc stack keeping its size */

#define condmovestack(L)	luaD_reallocstack((L), (L)->stacksize)

#endif

#if !defined(HARDMEMTESTS)

#define condchangemem(L)	condmovestack(L)

#else

#define condchangemem(L)  \

	((void)(gcstopped(G(L)) || (luaC_fullgc(L, 0), 1)))

#endif

#endif