GCtab *lj_lib_checktab(lua_State *L, int narg)
{
TValue *o = L->base + narg-1;
if (!(o < L->top && tvistab(o)))
lj_err_argt(L, narg, LUA_TTABLE);
return tabV(o);
}
GCtab *lj_lib_checktabornil(lua_State *L, int narg)
{
TValue *o = L->base + narg-1;
if (o < L->top) {
if (tvistab(o))
return tabV(o);
else if (tvisnil(o))
return NULL;
}
lj_err_arg(L, narg, LJ_ERR_NOTABN);
return NULL; /* unreachable */
}
/* Helper for LEN. __len metamethod. */
TValue * LJ_FASTCALL lj_meta_len(lua_State *L, cTValue *o)
{
cTValue *mo = lj_meta_lookup(L, o, MM_len);
if (tvisnil(mo)) {
if (LJ_52 && tvistab(o))
tabref(tabV(o)->metatable)->nomm |= (uint8_t)(1u<<MM_len);
else
lj_err_optype(L, o, LJ_ERR_OPLEN);
return NULL;
}
return mmcall(L, lj_cont_ra, mo, o, LJ_52 ? o : niltv(L));
}
/* -- Luajittex needs this one because it overloads loadfile -- */
LUALIB_API int RESERVED_load_aux_JIT(lua_State *L, int status, int envarg)
{
if (status == 0) {
if (tvistab(L->base+envarg-1)) {
GCfunc *fn = funcV(L->top-1);
GCtab *t = tabV(L->base+envarg-1);
setgcref(fn->c.env, obj2gco(t));
lj_gc_objbarrier(L, fn, t);
}
return 1;
} else {
setnilV(L->top-2);
return 2;
}
}
/* Lookup metamethod for object. */
cTValue *lj_meta_lookup(lua_State *L, cTValue *o, MMS mm)
{
GCtab *mt;
if (tvistab(o))
mt = tabref(tabV(o)->metatable);
else if (tvisudata(o))
mt = tabref(udataV(o)->metatable);
else
mt = tabref(basemt_obj(G(L), o));
if (mt) {
cTValue *mo = lj_tab_getstr(mt, mmname_str(G(L), mm));
if (mo)
return mo;
}
return niltv(L);
}
ptrdiff_t lj_vmevent_prepare(lua_State *L, VMEvent ev)
{
global_State *g = G(L);
GCstr *s = lj_str_newlit(L, LJ_VMEVENTS_REGKEY);
cTValue *tv = lj_tab_getstr(tabV(registry(L)), s);
if (tvistab(tv)) {
int hash = VMEVENT_HASH(ev);
tv = lj_tab_getint(tabV(tv), hash);
if (tv && tvisfunc(tv)) {
lj_state_checkstack(L, LUA_MINSTACK);
setfuncV(L, L->top++, funcV(tv));
return savestack(L, L->top);
}
}
g->vmevmask &= ~VMEVENT_MASK(ev); /* No handler: cache this fact. */
return 0;
}
/* Helper for LEN. __len metamethod. */
TValue * LJ_FASTCALL lj_meta_len(lua_State *L, cTValue *o)
{
cTValue *mo = lj_meta_lookup(L, o, MM_len);
if (tvisnil(mo)) {
#ifdef LUAJIT_ENABLE_LUA52COMPAT
if (tvistab(o))
tabref(tabV(o)->metatable)->nomm |= (uint8_t)(1u<<MM_len);
else
#endif
lj_err_optype(L, o, LJ_ERR_OPLEN);
return NULL;
}
#ifdef LUAJIT_ENABLE_LUA52COMPAT
return mmcall(L, lj_cont_ra, mo, o, o);
#else
return mmcall(L, lj_cont_ra, mo, o, niltv(L));
#endif
}
static GCtab *lib_create_table(lua_State *L, const char *libname, int hsize)
{
if (libname) {
luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 16);
lua_getfield(L, -1, libname);
if (!tvistab(L->top-1)) {
L->top--;
if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, hsize) != NULL)
lj_err_callerv(L, LJ_ERR_BADMODN, libname);
settabV(L, L->top, tabV(L->top-1));
L->top++;
lua_setfield(L, -3, libname); /* _LOADED[libname] = new table */
}
L->top--;
settabV(L, L->top-1, tabV(L->top));
} else {
lua_createtable(L, 0, hsize);
}
return tabV(L->top-1);
}
/* Helper for TSET*. __newindex chain and metamethod. */
TValue *lj_meta_tset(lua_State *L, cTValue *o, cTValue *k)
{
TValue tmp;
int loop;
for (loop = 0; loop < LJ_MAX_IDXCHAIN; loop++) {
cTValue *mo;
if (LJ_LIKELY(tvistab(o))) {
GCtab *t = tabV(o);
cTValue *tv = lj_tab_get(L, t, k);
if (LJ_LIKELY(!tvisnil(tv))) {
t->nomm = 0; /* Invalidate negative metamethod cache. */
lj_gc_anybarriert(L, t);
return (TValue *)tv;
} else if (!(mo = lj_meta_fast(L, tabref(t->metatable), MM_newindex))) {
t->nomm = 0; /* Invalidate negative metamethod cache. */
lj_gc_anybarriert(L, t);
if (tv != niltv(L))
return (TValue *)tv;
if (tvisnil(k)) lj_err_msg(L, LJ_ERR_NILIDX);
else if (tvisint(k)) { setnumV(&tmp, (lua_Number)intV(k)); k = &tmp; }
else if (tvisnum(k) && tvisnan(k)) lj_err_msg(L, LJ_ERR_NANIDX);
return lj_tab_newkey(L, t, k);
}
} else if (tvisnil(mo = lj_meta_lookup(L, o, MM_newindex))) {
lj_err_optype(L, o, LJ_ERR_OPINDEX);
return NULL; /* unreachable */
}
if (tvisfunc(mo)) {
L->top = mmcall(L, lj_cont_nop, mo, o, k);
/* L->top+2 = v filled in by caller. */
return NULL; /* Trigger metamethod call. */
}
copyTV(L, &tmp, mo);
o = &tmp;
}
lj_err_msg(L, LJ_ERR_SETLOOP);
return NULL; /* unreachable */
}
/* Helper for TGET*. __index chain and metamethod. */
cTValue *lj_meta_tget(lua_State *L, cTValue *o, cTValue *k)
{
int loop;
for (loop = 0; loop < LJ_MAX_IDXCHAIN; loop++) {
cTValue *mo;
if (LJ_LIKELY(tvistab(o))) {
GCtab *t = tabV(o);
cTValue *tv = lj_tab_get(L, t, k);
if (!tvisnil(tv) ||
!(mo = lj_meta_fast(L, tabref(t->metatable), MM_index)))
return tv;
} else if (tvisnil(mo = lj_meta_lookup(L, o, MM_index))) {
lj_err_optype(L, o, LJ_ERR_OPINDEX);
return NULL; /* unreachable */
}
if (tvisfunc(mo)) {
L->top = mmcall(L, lj_cont_ra, mo, o, k);
return NULL; /* Trigger metamethod call. */
}
o = mo;
}
lj_err_msg(L, LJ_ERR_GETLOOP);
return NULL; /* unreachable */
}
