luaur-vm 0.1.3

The Luau register virtual machine and standard library (Rust).
Documentation 
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use crate::enums::lua_type::lua_Type;
use crate::functions::freegcoblock::freegcoblock;
use crate::functions::freepage::freepage;
use crate::records::gc_object::GCObject;
use crate::records::lua_page::lua_Page;
use crate::type_aliases::lua_state::lua_State;
use core::ffi::c_void;
use luaur_common::macros::luau_assert::LUAU_ASSERT;

#[allow(non_snake_case)]
pub unsafe fn luaM_freegco_(
    l: *mut lua_State,
    block: *mut GCObject,
    osize: usize,
    memcat: u8,
    page: *mut lua_Page,
) {
    let g = (*l).global;
    LUAU_ASSERT!((osize == 0) == block.is_null());

    let sizeclass = |size: usize| -> i32 {
        if size == 0 || size > 1024 {
            -1
        } else if size <= 56 {
            ((size + 7) / 8 - 1) as i32
        } else if size <= 240 {
            (7 + (size - 49) / 16) as i32
        } else if size <= 480 {
            (19 + (size - 225) / 32) as i32
        } else {
            (27 + (size - 449) / 64) as i32
        }
    };

    let oclass = sizeclass(osize);

    if oclass >= 0 {
        (*block).gch.tt = lua_Type::LUA_TNIL as u8;

        freegcoblock(l, oclass, block as *mut c_void, page);
    } else {
        LUAU_ASSERT!((*page).busyBlocks == 1);
        LUAU_ASSERT!((*page).blockSize as usize == osize);
        LUAU_ASSERT!(block as *mut c_void == core::ptr::addr_of_mut!((*page).data) as *mut c_void);

        freepage(l, core::ptr::addr_of_mut!((*g).allgcopages), page);
    }

    (*g).totalbytes = (*g).totalbytes.wrapping_sub(osize);
    let memcatbytes = core::ptr::addr_of_mut!((*g).memcatbytes) as *mut usize;
    *memcatbytes.add(memcat as usize) = (*memcatbytes.add(memcat as usize)).wrapping_sub(osize);
}