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      1 /*	$NetBSD: lvm.h,v 1.12 2023/06/08 21:12:08 nikita Exp $	*/
      2 
      3 /*
      4 ** Id: lvm.h
      5 ** Lua virtual machine
      6 ** See Copyright Notice in lua.h
      7 */
      8 
      9 #ifndef lvm_h
     10 #define lvm_h
     11 
     12 
     13 #include "ldo.h"
     14 #include "lobject.h"
     15 #include "ltm.h"
     16 
     17 
     18 #if !defined(LUA_NOCVTN2S)
     19 #define cvt2str(o)	ttisnumber(o)
     20 #else
     21 #define cvt2str(o)	0	/* no conversion from numbers to strings */
     22 #endif
     23 
     24 
     25 #if !defined(LUA_NOCVTS2N)
     26 #define cvt2num(o)	ttisstring(o)
     27 #else
     28 #define cvt2num(o)	0	/* no conversion from strings to numbers */
     29 #endif
     30 
     31 
     32 /*
     33 ** You can define LUA_FLOORN2I if you want to convert floats to integers
     34 ** by flooring them (instead of raising an error if they are not
     35 ** integral values)
     36 */
     37 #if !defined(LUA_FLOORN2I)
     38 #define LUA_FLOORN2I		F2Ieq
     39 #endif
     40 
     41 
     42 /*
     43 ** Rounding modes for float->integer coercion
     44  */
     45 typedef enum {
     46   F2Ieq,     /* no rounding; accepts only integral values */
     47   F2Ifloor,  /* takes the floor of the number */
     48   F2Iceil    /* takes the ceil of the number */
     49 } F2Imod;
     50 
     51 
     52 /* convert an object to a float (including string coercion) */
     53 #ifndef _KERNEL
     54 #define tonumber(o,n) \
     55 	(ttisfloat(o) ? (*(n) = fltvalue(o), 1) : luaV_tonumber_(o,n))
     56 #else /* _KERNEL */
     57 #define tonumber       tointeger
     58 #endif /* _KERNEL */
     59 
     60 
     61 /* convert an object to a float (without string coercion) */
     62 #define tonumberns(o,n) \
     63 	(ttisfloat(o) ? ((n) = fltvalue(o), 1) : \
     64 	(ttisinteger(o) ? ((n) = cast_num(ivalue(o)), 1) : 0))
     65 
     66 
     67 /* convert an object to an integer (including string coercion) */
     68 #define tointeger(o,i) \
     69   (l_likely(ttisinteger(o)) ? (*(i) = ivalue(o), 1) \
     70                           : luaV_tointeger(o,i,LUA_FLOORN2I))
     71 
     72 
     73 /* convert an object to an integer (without string coercion) */
     74 #define tointegerns(o,i) \
     75   (l_likely(ttisinteger(o)) ? (*(i) = ivalue(o), 1) \
     76                           : luaV_tointegerns(o,i,LUA_FLOORN2I))
     77 
     78 
     79 #define intop(op,v1,v2) l_castU2S(l_castS2U(v1) op l_castS2U(v2))
     80 
     81 #define luaV_rawequalobj(t1,t2)		luaV_equalobj(NULL,t1,t2)
     82 
     83 
     84 /*
     85 ** fast track for 'gettable': if 't' is a table and 't[k]' is present,
     86 ** return 1 with 'slot' pointing to 't[k]' (position of final result).
     87 ** Otherwise, return 0 (meaning it will have to check metamethod)
     88 ** with 'slot' pointing to an empty 't[k]' (if 't' is a table) or NULL
     89 ** (otherwise). 'f' is the raw get function to use.
     90 */
     91 #define luaV_fastget(L,t,k,slot,f) \
     92   (!ttistable(t)  \
     93    ? (slot = NULL, 0)  /* not a table; 'slot' is NULL and result is 0 */  \
     94    : (slot = f(hvalue(t), k),  /* else, do raw access */  \
     95       !isempty(slot)))  /* result not empty? */
     96 
     97 
     98 /*
     99 ** Special case of 'luaV_fastget' for integers, inlining the fast case
    100 ** of 'luaH_getint'.
    101 */
    102 #define luaV_fastgeti(L,t,k,slot) \
    103   (!ttistable(t)  \
    104    ? (slot = NULL, 0)  /* not a table; 'slot' is NULL and result is 0 */  \
    105    : (slot = (l_castS2U(k) - 1u < hvalue(t)->alimit) \
    106               ? &hvalue(t)->array[k - 1] : luaH_getint(hvalue(t), k), \
    107       !isempty(slot)))  /* result not empty? */
    108 
    109 
    110 /*
    111 ** Finish a fast set operation (when fast get succeeds). In that case,
    112 ** 'slot' points to the place to put the value.
    113 */
    114 #define luaV_finishfastset(L,t,slot,v) \
    115     { setobj2t(L, cast(TValue *,slot), v); \
    116       luaC_barrierback(L, gcvalue(t), v); }
    117 
    118 
    119 /*
    120 ** Shift right is the same as shift left with a negative 'y'
    121 */
    122 #define luaV_shiftr(x,y)	luaV_shiftl(x,intop(-, 0, y))
    123 
    124 
    125 
    126 LUAI_FUNC int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2);
    127 LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);
    128 LUAI_FUNC int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r);
    129 LUAI_FUNC int luaV_tonumber_ (const TValue *obj, lua_Number *n);
    130 LUAI_FUNC int luaV_tointeger (const TValue *obj, lua_Integer *p, F2Imod mode);
    131 LUAI_FUNC int luaV_tointegerns (const TValue *obj, lua_Integer *p,
    132                                 F2Imod mode);
    133 LUAI_FUNC int luaV_flttointeger (lua_Number n, lua_Integer *p, F2Imod mode);
    134 LUAI_FUNC void luaV_finishget (lua_State *L, const TValue *t, TValue *key,
    135                                StkId val, const TValue *slot);
    136 LUAI_FUNC void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
    137                                TValue *val, const TValue *slot);
    138 LUAI_FUNC void luaV_finishOp (lua_State *L);
    139 LUAI_FUNC void luaV_execute (lua_State *L, CallInfo *ci);
    140 LUAI_FUNC void luaV_concat (lua_State *L, int total);
    141 LUAI_FUNC lua_Integer luaV_idiv (lua_State *L, lua_Integer x, lua_Integer y);
    142 LUAI_FUNC lua_Integer luaV_mod (lua_State *L, lua_Integer x, lua_Integer y);
    143 LUAI_FUNC lua_Number luaV_modf (lua_State *L, lua_Number x, lua_Number y);
    144 LUAI_FUNC lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y);
    145 LUAI_FUNC void luaV_objlen (lua_State *L, StkId ra, const TValue *rb);
    146 
    147 #endif
    148