misc/liblua/llimits.h
author Drew Gottlieb
Wed, 05 Dec 2012 18:12:07 +0100
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/*
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** $Id: llimits.h,v 1.69.1.1 2007/12/27 13:02:25 roberto Exp $
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** Limits, basic types, and some other `installation-dependent' definitions
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** See Copyright Notice in lua.h
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*/
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#ifndef llimits_h
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#define llimits_h
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#include <limits.h>
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#include <stddef.h>
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#include "lua.h"
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typedef LUAI_UINT32 lu_int32;
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typedef LUAI_UMEM lu_mem;
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typedef LUAI_MEM l_mem;
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/* chars used as small naturals (so that `char' is reserved for characters) */
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typedef unsigned char lu_byte;
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#define MAX_SIZET	((size_t)(~(size_t)0)-2)
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#define MAX_LUMEM	((lu_mem)(~(lu_mem)0)-2)
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#define MAX_INT (INT_MAX-2)  /* maximum value of an int (-2 for safety) */
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/*
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** conversion of pointer to integer
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** this is for hashing only; there is no problem if the integer
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** cannot hold the whole pointer value
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*/
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#define IntPoint(p)  ((unsigned int)(lu_mem)(p))
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/* type to ensure maximum alignment */
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typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
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/* result of a `usual argument conversion' over lua_Number */
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typedef LUAI_UACNUMBER l_uacNumber;
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/* internal assertions for in-house debugging */
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#ifdef lua_assert
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#define check_exp(c,e)		(lua_assert(c), (e))
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#define api_check(l,e)		lua_assert(e)
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#else
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#define lua_assert(c)		((void)0)
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#define check_exp(c,e)		(e)
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#define api_check		luai_apicheck
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#endif
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#ifndef UNUSED
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#define UNUSED(x)	((void)(x))	/* to avoid warnings */
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#endif
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#ifndef cast
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#define cast(t, exp)	((t)(exp))
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#endif
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#define cast_byte(i)	cast(lu_byte, (i))
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#define cast_num(i)	cast(lua_Number, (i))
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#define cast_int(i)	cast(int, (i))
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/*
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** type for virtual-machine instructions
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** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
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*/
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typedef lu_int32 Instruction;
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/* maximum stack for a Lua function */
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#define MAXSTACK	250
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/* minimum size for the string table (must be power of 2) */
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#ifndef MINSTRTABSIZE
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#define MINSTRTABSIZE	32
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#endif
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/* minimum size for string buffer */
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#ifndef LUA_MINBUFFER
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#define LUA_MINBUFFER	32
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#endif
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#ifndef lua_lock
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#define lua_lock(L)     ((void) 0)
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#define lua_unlock(L)   ((void) 0)
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#endif
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#ifndef luai_threadyield
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#define luai_threadyield(L)     {lua_unlock(L); lua_lock(L);}
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#endif
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/*
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** macro to control inclusion of some hard tests on stack reallocation
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*/
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#ifndef HARDSTACKTESTS
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#define condhardstacktests(x)	((void)0)
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#else
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#define condhardstacktests(x)	x
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#endif
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#endif