/*

** $Id: llimits.h,v 1.103.1.1 2013/04/12 18:48:47 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 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 MAX_LMEM ((l_mem) ((MAX_LUMEM >> 1) - 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 */

#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))

/* to avoid problems with conditions too long */

#define lua_longassert(c) { if (!(c)) 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)

#if defined(LUA_USE_APICHECK)

#include <assert.h>

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

#else

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

#endif

#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))

#define cast_uchar(i) cast(unsigned char, (i))

/*

** non-return type

*/

#if defined(__GNUC__)

#define l_noret void __attribute__((noreturn))

#elif defined(_MSC_VER)

#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

/*

** 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.

** luai_hashnum is a macro to 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).

*/

#if defined(MS_ASMTRICK) || defined(LUA_MSASMTRICK) /* { */

/* 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 int 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_IEEEENDIANLOC (ieeeendian.l_p[1] == 33)

#else

#define LUA_IEEEENDIANLOC LUA_IEEEENDIAN

#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_IEEEENDIANLOC]; }

#define luai_hashnum(i,n) \

{ volatile union luai_Cast u; u.l_d = (n) + 1.0; /* avoid -0 */ \

(i) = u.l_p[0]; (i) += u.l_p[1]; } /* add double bits for his hash */

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

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

/* the trick can be expanded to lua_Integer when it is a 32-bit value */

#if defined(LUA_IEEELL)

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

#endif

#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) || defined(LUA_NUMBER_FLOAT)

#include <math.h>

#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

#if defined(ltable_c) && !defined(luai_hashnum)

#include <float.h>

#include <math.h>

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

n = l_mathop(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)(!(G(L)->gcrunning) || (luaC_fullgc(L, 0), 1)))

#endif

#endif