mudgangster

Tiny, scriptable MUD client
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lvm.h (3685B)


      1 /*
      2 ** $Id: lvm.h,v 2.41.1.1 2017/04/19 17:20:42 roberto Exp $
      3 ** Lua virtual machine
      4 ** See Copyright Notice in lua.h
      5 */
      6 
      7 #ifndef lvm_h
      8 #define lvm_h
      9 
     10 
     11 #include "ldo.h"
     12 #include "lobject.h"
     13 #include "ltm.h"
     14 
     15 
     16 #if !defined(LUA_NOCVTN2S)
     17 #define cvt2str(o)	ttisnumber(o)
     18 #else
     19 #define cvt2str(o)	0	/* no conversion from numbers to strings */
     20 #endif
     21 
     22 
     23 #if !defined(LUA_NOCVTS2N)
     24 #define cvt2num(o)	ttisstring(o)
     25 #else
     26 #define cvt2num(o)	0	/* no conversion from strings to numbers */
     27 #endif
     28 
     29 
     30 /*
     31 ** You can define LUA_FLOORN2I if you want to convert floats to integers
     32 ** by flooring them (instead of raising an error if they are not
     33 ** integral values)
     34 */
     35 #if !defined(LUA_FLOORN2I)
     36 #define LUA_FLOORN2I		0
     37 #endif
     38 
     39 
     40 #define tonumber(o,n) \
     41 	(ttisfloat(o) ? (*(n) = fltvalue(o), 1) : luaV_tonumber_(o,n))
     42 
     43 #define tointeger(o,i) \
     44     (ttisinteger(o) ? (*(i) = ivalue(o), 1) : luaV_tointeger(o,i,LUA_FLOORN2I))
     45 
     46 #define intop(op,v1,v2) l_castU2S(l_castS2U(v1) op l_castS2U(v2))
     47 
     48 #define luaV_rawequalobj(t1,t2)		luaV_equalobj(NULL,t1,t2)
     49 
     50 
     51 /*
     52 ** fast track for 'gettable': if 't' is a table and 't[k]' is not nil,
     53 ** return 1 with 'slot' pointing to 't[k]' (final result).  Otherwise,
     54 ** return 0 (meaning it will have to check metamethod) with 'slot'
     55 ** pointing to a nil 't[k]' (if 't' is a table) or NULL (otherwise).
     56 ** 'f' is the raw get function to use.
     57 */
     58 #define luaV_fastget(L,t,k,slot,f) \
     59   (!ttistable(t)  \
     60    ? (slot = NULL, 0)  /* not a table; 'slot' is NULL and result is 0 */  \
     61    : (slot = f(hvalue(t), k),  /* else, do raw access */  \
     62       !ttisnil(slot)))  /* result not nil? */
     63 
     64 /*
     65 ** standard implementation for 'gettable'
     66 */
     67 #define luaV_gettable(L,t,k,v) { const TValue *slot; \
     68   if (luaV_fastget(L,t,k,slot,luaH_get)) { setobj2s(L, v, slot); } \
     69   else luaV_finishget(L,t,k,v,slot); }
     70 
     71 
     72 /*
     73 ** Fast track for set table. If 't' is a table and 't[k]' is not nil,
     74 ** call GC barrier, do a raw 't[k]=v', and return true; otherwise,
     75 ** return false with 'slot' equal to NULL (if 't' is not a table) or
     76 ** 'nil'. (This is needed by 'luaV_finishget'.) Note that, if the macro
     77 ** returns true, there is no need to 'invalidateTMcache', because the
     78 ** call is not creating a new entry.
     79 */
     80 #define luaV_fastset(L,t,k,slot,f,v) \
     81   (!ttistable(t) \
     82    ? (slot = NULL, 0) \
     83    : (slot = f(hvalue(t), k), \
     84      ttisnil(slot) ? 0 \
     85      : (luaC_barrierback(L, hvalue(t), v), \
     86         setobj2t(L, cast(TValue *,slot), v), \
     87         1)))
     88 
     89 
     90 #define luaV_settable(L,t,k,v) { const TValue *slot; \
     91   if (!luaV_fastset(L,t,k,slot,luaH_get,v)) \
     92     luaV_finishset(L,t,k,v,slot); }
     93 
     94 
     95 
     96 LUAI_FUNC int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2);
     97 LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);
     98 LUAI_FUNC int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r);
     99 LUAI_FUNC int luaV_tonumber_ (const TValue *obj, lua_Number *n);
    100 LUAI_FUNC int luaV_tointeger (const TValue *obj, lua_Integer *p, int mode);
    101 LUAI_FUNC void luaV_finishget (lua_State *L, const TValue *t, TValue *key,
    102                                StkId val, const TValue *slot);
    103 LUAI_FUNC void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
    104                                StkId val, const TValue *slot);
    105 LUAI_FUNC void luaV_finishOp (lua_State *L);
    106 LUAI_FUNC void luaV_execute (lua_State *L);
    107 LUAI_FUNC void luaV_concat (lua_State *L, int total);
    108 LUAI_FUNC lua_Integer luaV_div (lua_State *L, lua_Integer x, lua_Integer y);
    109 LUAI_FUNC lua_Integer luaV_mod (lua_State *L, lua_Integer x, lua_Integer y);
    110 LUAI_FUNC lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y);
    111 LUAI_FUNC void luaV_objlen (lua_State *L, StkId ra, const TValue *rb);
    112 
    113 #endif