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1 /*
2 ** $Id: lvm.h $
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		F2Ieq
37 #endif
38 
39 
40 /*
41 ** Rounding modes for float->integer coercion
42  */
43 typedef enum {
44   F2Ieq,     /* no rounding; accepts only integral values */
45   F2Ifloor,  /* takes the floor of the number */
46   F2Iceil    /* takes the ceil of the number */
47 } F2Imod;
48 
49 
50 /* convert an object to a float (including string coercion) */
51 #define tonumber(o,n) \
52 	(ttisfloat(o) ? (*(n) = fltvalue(o), 1) : luaV_tonumber_(o,n))
53 
54 
55 /* convert an object to a float (without string coercion) */
56 #define tonumberns(o,n) \
57 	(ttisfloat(o) ? ((n) = fltvalue(o), 1) : \
58 	(ttisinteger(o) ? ((n) = cast_num(ivalue(o)), 1) : 0))
59 
60 
61 /* convert an object to an integer (including string coercion) */
62 #define tointeger(o,i) \
63   (ttisinteger(o) ? (*(i) = ivalue(o), 1) : luaV_tointeger(o,i,LUA_FLOORN2I))
64 
65 
66 /* convert an object to an integer (without string coercion) */
67 #define tointegerns(o,i) \
68   (ttisinteger(o) ? (*(i) = ivalue(o), 1) : luaV_tointegerns(o,i,LUA_FLOORN2I))
69 
70 
71 #define intop(op,v1,v2) l_castU2S(l_castS2U(v1) op l_castS2U(v2))
72 
73 #define luaV_rawequalobj(t1,t2)		luaV_equalobj(NULL,t1,t2)
74 
75 
76 /*
77 ** fast track for 'gettable': if 't' is a table and 't[k]' is present,
78 ** return 1 with 'slot' pointing to 't[k]' (position of final result).
79 ** Otherwise, return 0 (meaning it will have to check metamethod)
80 ** with 'slot' pointing to an empty 't[k]' (if 't' is a table) or NULL
81 ** (otherwise). 'f' is the raw get function to use.
82 */
83 #define luaV_fastget(L,t,k,slot,f) \
84   (!ttistable(t)  \
85    ? (slot = NULL, 0)  /* not a table; 'slot' is NULL and result is 0 */  \
86    : (slot = f(hvalue(t), k),  /* else, do raw access */  \
87       !isempty(slot)))  /* result not empty? */
88 
89 
90 /*
91 ** Special case of 'luaV_fastget' for integers, inlining the fast case
92 ** of 'luaH_getint'.
93 */
94 #define luaV_fastgeti(L,t,k,slot) \
95   (!ttistable(t)  \
96    ? (slot = NULL, 0)  /* not a table; 'slot' is NULL and result is 0 */  \
97    : (slot = (l_castS2U(k) - 1u < hvalue(t)->alimit) \
98               ? &hvalue(t)->array[k - 1] : luaH_getint(hvalue(t), k), \
99       !isempty(slot)))  /* result not empty? */
100 
101 
102 /*
103 ** Finish a fast set operation (when fast get succeeds). In that case,
104 ** 'slot' points to the place to put the value.
105 */
106 #define luaV_finishfastset(L,t,slot,v) \
107     { setobj2t(L, cast(TValue *,slot), v); \
108       luaC_barrierback(L, gcvalue(t), v); }
109 
110 
111 
112 
113 LUAI_FUNC int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2);
114 LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);
115 LUAI_FUNC int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r);
116 LUAI_FUNC int luaV_tonumber_ (const TValue *obj, lua_Number *n);
117 LUAI_FUNC int luaV_tointeger (const TValue *obj, lua_Integer *p, F2Imod mode);
118 LUAI_FUNC int luaV_tointegerns (const TValue *obj, lua_Integer *p,
119                                 F2Imod mode);
120 LUAI_FUNC int luaV_flttointeger (lua_Number n, lua_Integer *p, F2Imod mode);
121 LUAI_FUNC void luaV_finishget (lua_State *L, const TValue *t, TValue *key,
122                                StkId val, const TValue *slot);
123 LUAI_FUNC void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
124                                TValue *val, const TValue *slot);
125 LUAI_FUNC void luaV_finishOp (lua_State *L);
126 LUAI_FUNC void luaV_execute (lua_State *L, CallInfo *ci);
127 LUAI_FUNC void luaV_concat (lua_State *L, int total);
128 LUAI_FUNC lua_Integer luaV_idiv (lua_State *L, lua_Integer x, lua_Integer y);
129 LUAI_FUNC lua_Integer luaV_mod (lua_State *L, lua_Integer x, lua_Integer y);
130 LUAI_FUNC lua_Number luaV_modf (lua_State *L, lua_Number x, lua_Number y);
131 LUAI_FUNC lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y);
132 LUAI_FUNC void luaV_objlen (lua_State *L, StkId ra, const TValue *rb);
133 
134 #endif
135