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luaur_vm/functions/
lua_getuserdatametatable.rs

1use crate::enums::lua_type::lua_Type;
2use crate::functions::lua_c_barrierback::lua_c_barrierback;
3use crate::macros::api_check::api_check;
4use crate::macros::blackbit::BLACKBIT;
5use crate::macros::lua_utag_limit::LUA_UTAG_LIMIT;
6use crate::records::gc_object::GCObject;
7use crate::records::lua_state::lua_State;
8
9#[allow(non_snake_case)]
10pub fn lua_getuserdatametatable(L: *mut lua_State, tag: core::ffi::c_int) {
11    api_check!(L, (tag as u32) < LUA_UTAG_LIMIT as u32);
12
13    unsafe {
14        let marked = (*L).hdr.marked;
15        if (marked as i32 & (1 << BLACKBIT)) != 0 {
16            lua_c_barrierback(L, L as *mut GCObject, &mut (*L).gclist);
17        }
18
19        let h = (*(*L).global).udatamt[tag as usize];
20        if !h.is_null() {
21            let i_o = (*L).top;
22            (*i_o).value.gc = h as *mut GCObject;
23            (*i_o).tt = lua_Type::LUA_TTABLE as core::ffi::c_int;
24        } else {
25            (*(*L).top).tt = lua_Type::LUA_TNIL as i32;
26        }
27
28        api_check!(L, (*L).top < (*(*L).ci).top);
29        (*L).top = (*L).top.add(1);
30    }
31}