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luaur_vm/functions/
lua_insert.rs

1//! Node: `cxx:Function:Luau.VM:VM/src/lapi.cpp:272:lua_insert`
2//! Source: `VM/src/lapi.cpp:272-280` (hand-ported)
3
4use core::ffi::c_int;
5
6use crate::functions::index_2_addr::index2addr;
7use crate::functions::lua_concat::lua_c_threadbarrier_lapi;
8use crate::macros::api_check::api_check;
9use crate::macros::lua_o_nilobject::luaO_nilobject;
10use crate::macros::setobj_2_s::setobj2s;
11use crate::type_aliases::lua_state::lua_State;
12use crate::type_aliases::stk_id::StkId;
13
14#[allow(non_snake_case)]
15pub unsafe fn lua_insert(L: *mut lua_State, idx: c_int) {
16    lua_c_threadbarrier_lapi(L);
17    let p: StkId = index2addr(L, idx);
18    api_check!(L, p != luaO_nilobject as StkId);
19
20    let mut q = (*L).top;
21    while q > p {
22        setobj2s!(L, q, q.sub(1));
23        q = q.sub(1);
24    }
25    setobj2s!(L, p, (*L).top);
26}