]>
git.proxmox.com Git - ceph.git/blob - ceph/src/civetweb/src/third_party/lua-5.3.3/src/ltm.c
2 ** $Id: ltm.c,v 2.37 2016/02/26 19:20:15 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_getshortstr(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_getshortstr(mt
, G(L
)->tmname
[event
]) : luaO_nilobject
);
87 ** Return the name of the type of an object. For tables and userdata
88 ** with metatable, use their '__name' metafield, if present.
90 const char *luaT_objtypename (lua_State
*L
, const TValue
*o
) {
92 if ((ttistable(o
) && (mt
= hvalue(o
)->metatable
) != NULL
) ||
93 (ttisfulluserdata(o
) && (mt
= uvalue(o
)->metatable
) != NULL
)) {
94 const TValue
*name
= luaH_getshortstr(mt
, luaS_new(L
, "__name"));
95 if (ttisstring(name
)) /* is '__name' a string? */
96 return getstr(tsvalue(name
)); /* use it as type name */
98 return ttypename(ttnov(o
)); /* else use standard type name */
102 void luaT_callTM (lua_State
*L
, const TValue
*f
, const TValue
*p1
,
103 const TValue
*p2
, TValue
*p3
, int hasres
) {
104 ptrdiff_t result
= savestack(L
, p3
);
106 setobj2s(L
, func
, f
); /* push function (assume EXTRA_STACK) */
107 setobj2s(L
, func
+ 1, p1
); /* 1st argument */
108 setobj2s(L
, func
+ 2, p2
); /* 2nd argument */
110 if (!hasres
) /* no result? 'p3' is third argument */
111 setobj2s(L
, L
->top
++, p3
); /* 3rd argument */
112 /* metamethod may yield only when called from Lua code */
114 luaD_call(L
, func
, hasres
);
116 luaD_callnoyield(L
, func
, hasres
);
117 if (hasres
) { /* if has result, move it to its place */
118 p3
= restorestack(L
, result
);
119 setobjs2s(L
, p3
, --L
->top
);
124 int luaT_callbinTM (lua_State
*L
, const TValue
*p1
, const TValue
*p2
,
125 StkId res
, TMS event
) {
126 const TValue
*tm
= luaT_gettmbyobj(L
, p1
, event
); /* try first operand */
128 tm
= luaT_gettmbyobj(L
, p2
, event
); /* try second operand */
129 if (ttisnil(tm
)) return 0;
130 luaT_callTM(L
, tm
, p1
, p2
, res
, 1);
135 void luaT_trybinTM (lua_State
*L
, const TValue
*p1
, const TValue
*p2
,
136 StkId res
, TMS event
) {
137 if (!luaT_callbinTM(L
, p1
, p2
, res
, event
)) {
140 luaG_concaterror(L
, p1
, p2
);
141 /* call never returns, but to avoid warnings: *//* FALLTHROUGH */
142 case TM_BAND
: case TM_BOR
: case TM_BXOR
:
143 case TM_SHL
: case TM_SHR
: case TM_BNOT
: {
145 if (tonumber(p1
, &dummy
) && tonumber(p2
, &dummy
))
146 luaG_tointerror(L
, p1
, p2
);
148 luaG_opinterror(L
, p1
, p2
, "perform bitwise operation on");
150 /* calls never return, but to avoid warnings: *//* FALLTHROUGH */
152 luaG_opinterror(L
, p1
, p2
, "perform arithmetic on");
158 int luaT_callorderTM (lua_State
*L
, const TValue
*p1
, const TValue
*p2
,
160 if (!luaT_callbinTM(L
, p1
, p2
, L
->top
, event
))
161 return -1; /* no metamethod */
163 return !l_isfalse(L
->top
);