FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/lua/llimits.h

     /*
     ** $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 <sys/lua/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
    **
   ** Suppress noreturn attribute in kernel builds to avoid objtool check warnings
   */
   #if defined(__GNUC__) && !defined(_KERNEL)
   #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.)
   **
   ** Note: On amd64 platform, the limit has been measured to be 45.  We set
   ** the maximum lower to give a margin for changing the amount of stack
   ** used by various functions involved in parsing and executing code.
   */
   #if !defined(LUAI_MAXCCALLS)
   #define LUAI_MAXCCALLS          20
   #endif
   
   /*
    * Minimum amount of available stack space (in bytes) to make a C call.  With
    * gsub() recursion, the stack space between each luaD_call() is 1256 bytes.
    */
   #define LUAI_MINCSTACK          4096
   
   /*
   ** 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)
   
   #define luai_hashnum(i,n) (i = lcompat_hashnum(n))
   
   #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

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