]>
git.proxmox.com Git - ceph.git/blob - ceph/src/civetweb/src/third_party/lua-5.3.1/src/ltm.c
2 ** $Id: ltm.c,v 2.34 2015/03/30 15:42:27 roberto Exp $
4 ** See Copyright Notice in lua.h
27 static const char udatatypename
[] = "userdata";
29 LUAI_DDEF
const char *const luaT_typenames_
[LUA_TOTALTAGS
] = {
31 "nil", "boolean", udatatypename
, "number",
32 "string", "table", "function", udatatypename
, "thread",
33 "proto" /* this last case is used for tests only */
37 void luaT_init (lua_State
*L
) {
38 static const char *const luaT_eventname
[] = { /* ORDER TM */
39 "__index", "__newindex",
40 "__gc", "__mode", "__len", "__eq",
41 "__add", "__sub", "__mul", "__mod", "__pow",
43 "__band", "__bor", "__bxor", "__shl", "__shr",
44 "__unm", "__bnot", "__lt", "__le",
48 for (i
=0; i
<TM_N
; i
++) {
49 G(L
)->tmname
[i
] = luaS_new(L
, luaT_eventname
[i
]);
50 luaC_fix(L
, obj2gco(G(L
)->tmname
[i
])); /* never collect these names */
56 ** function to be used with macro "fasttm": optimized for absence of
59 const TValue
*luaT_gettm (Table
*events
, TMS event
, TString
*ename
) {
60 const TValue
*tm
= luaH_getstr(events
, ename
);
61 lua_assert(event
<= TM_EQ
);
62 if (ttisnil(tm
)) { /* no tag method? */
63 events
->flags
|= cast_byte(1u<<event
); /* cache this fact */
70 const TValue
*luaT_gettmbyobj (lua_State
*L
, const TValue
*o
, TMS event
) {
74 mt
= hvalue(o
)->metatable
;
77 mt
= uvalue(o
)->metatable
;
80 mt
= G(L
)->mt
[ttnov(o
)];
82 return (mt
? luaH_getstr(mt
, G(L
)->tmname
[event
]) : luaO_nilobject
);
86 void luaT_callTM (lua_State
*L
, const TValue
*f
, const TValue
*p1
,
87 const TValue
*p2
, TValue
*p3
, int hasres
) {
88 ptrdiff_t result
= savestack(L
, p3
);
89 setobj2s(L
, L
->top
++, f
); /* push function (assume EXTRA_STACK) */
90 setobj2s(L
, L
->top
++, p1
); /* 1st argument */
91 setobj2s(L
, L
->top
++, p2
); /* 2nd argument */
92 if (!hasres
) /* no result? 'p3' is third argument */
93 setobj2s(L
, L
->top
++, p3
); /* 3rd argument */
94 /* metamethod may yield only when called from Lua code */
95 luaD_call(L
, L
->top
- (4 - hasres
), hasres
, isLua(L
->ci
));
96 if (hasres
) { /* if has result, move it to its place */
97 p3
= restorestack(L
, result
);
98 setobjs2s(L
, p3
, --L
->top
);
103 int luaT_callbinTM (lua_State
*L
, const TValue
*p1
, const TValue
*p2
,
104 StkId res
, TMS event
) {
105 const TValue
*tm
= luaT_gettmbyobj(L
, p1
, event
); /* try first operand */
107 tm
= luaT_gettmbyobj(L
, p2
, event
); /* try second operand */
108 if (ttisnil(tm
)) return 0;
109 luaT_callTM(L
, tm
, p1
, p2
, res
, 1);
114 void luaT_trybinTM (lua_State
*L
, const TValue
*p1
, const TValue
*p2
,
115 StkId res
, TMS event
) {
116 if (!luaT_callbinTM(L
, p1
, p2
, res
, event
)) {
119 luaG_concaterror(L
, p1
, p2
);
120 /* call never returns, but to avoid warnings: *//* FALLTHROUGH */
121 case TM_BAND
: case TM_BOR
: case TM_BXOR
:
122 case TM_SHL
: case TM_SHR
: case TM_BNOT
: {
124 if (tonumber(p1
, &dummy
) && tonumber(p2
, &dummy
))
125 luaG_tointerror(L
, p1
, p2
);
127 luaG_opinterror(L
, p1
, p2
, "perform bitwise operation on");
129 /* calls never return, but to avoid warnings: *//* FALLTHROUGH */
131 luaG_opinterror(L
, p1
, p2
, "perform arithmetic on");
137 int luaT_callorderTM (lua_State
*L
, const TValue
*p1
, const TValue
*p2
,
139 if (!luaT_callbinTM(L
, p1
, p2
, L
->top
, event
))
140 return -1; /* no metamethod */
142 return !l_isfalse(L
->top
);