v0.9.2

Eg. `Lua::load_from_std_lib` with `StdLib::PACKAGE` is now supported for Luau.

.github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
           - os: windows-latest
             target: x86_64-pc-windows-msvc
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: ${{ matrix.rust }}
@@ -44,7 +44,7 @@ jobs:
       matrix:
         lua: [lua54, lua53, lua52, lua51, luajit]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: stable
@@ -60,7 +60,7 @@ jobs:
       matrix:
         lua: [lua54, lua53, lua52, lua51, luajit]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: stable
@@ -82,7 +82,7 @@ jobs:
       matrix:
         lua: [lua54, lua53, lua52, lua51]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: stable
@@ -113,7 +113,7 @@ jobs:
           - os: windows-latest
             target: x86_64-pc-windows-msvc
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: ${{ matrix.rust }}
@@ -145,7 +145,7 @@ jobs:
           - os: ubuntu-22.04
             target: x86_64-unknown-linux-gnu
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: ${{ matrix.rust }}
@@ -166,14 +166,14 @@ jobs:
       matrix:
         os: [ubuntu-22.04, macos-latest]
         rust: [stable]
-        lua: [lua54, lua53, lua52, lua51, luajit]
+        lua: [lua54, lua53, lua52, lua51, luajit, luau]
         include:
           - os: ubuntu-22.04
             target: x86_64-unknown-linux-gnu
           - os: macos-latest
             target: x86_64-apple-darwin
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: ${{ matrix.rust }}
@@ -197,7 +197,7 @@ jobs:
         shell: msys2 {0}
     steps:
       - uses: msys2/setup-msys2@v2
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Rust & Lua
         run: |
           pacman -S --noconfirm mingw-w64-x86_64-rust mingw-w64-x86_64-lua mingw-w64-x86_64-luajit mingw-w64-x86_64-pkg-config
@@ -210,7 +210,7 @@ jobs:
     name: Rustfmt
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: stable
@@ -218,18 +218,18 @@ jobs:
       - run: cargo fmt -- --check
 
   clippy:
-    name: Clippy check
+    name: Clippy
     runs-on: ubuntu-22.04
     strategy:
       matrix:
         lua: [lua54, lua53, lua52, lua51, luajit, luau, luau-jit, luau-vector4]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: nightly
           components: clippy
-      - uses: actions-rs/clippy-check@v1
+      - uses: giraffate/clippy-action@v1
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          args: --features "${{ matrix.lua }},vendored,async,send,serialize,macros,parking_lot,unstable"
+          reporter: 'github-pr-review'
+          clippy_flags: --features "${{ matrix.lua }},vendored,async,send,serialize,macros,parking_lot,unstable"

CHANGELOG.md

@@ -1,3 +1,46 @@
+## v0.9.2
+
+- Added binary modules support to Luau
+- Added Luau package module (uses `StdLib::PACKAGE`) with loaders (follows lua5.1 interface)
+- Added support of Luau 0.601+ buffer type (represented as userdata in Rust)
+- LuaJIT `cdata` type is also represented as userdata in Rust (instead of panic)
+- Vendored LuaJIT switched to rolling vanilla (from openresty)
+- Added `Table::for_each` method for fast table pairs traversal (faster than `pairs`)
+- Performance improvements around table traversal (and faster serialization)
+- Bug fixes and improvements
+
+## v0.9.1
+
+- impl Default for Lua
+- impl IntoLuaMulti for `std::result::Result<(), E>`
+- Fix using wrong userdata index after processing Variadic args (#311)
+
+## v0.9.0
+
+Changes since v0.9.0-rc.3
+
+- Improved non-static (scoped) userdata support
+- Added `Scope::create_any_userdata()` method
+- Added `Lua::set_vector_metatable()` method (`unstable` feature flag)
+- Added `OwnedThread` type (`unstable` feature flag)
+- Minimal Luau updated to 0.590
+- Added new option `sort_keys` to `DeserializeOptions` (`Lua::from_value()` method)
+- Changed `Table::raw_len()` output type to `usize`
+- Helper functions for `Value` (eg: `Value::as_number()`/`Value::as_string`/etc)
+- Performance improvements
+
+## v0.9.0-rc.3
+
+- Minimal Luau updated to 0.588
+
+## v0.9.0-rc.2
+
+- Added `#[derive(FromLua)]` macro to opt-in into `FromLua<T> where T: 'static + Clone` (userdata type).
+- Support vendored module mode for windows (raw-dylib linking, Rust 1.71+)
+- `module` and `vendored` features are now mutually exclusive
+- Use `C-unwind` ABI (Rust 1.71+)
+- Changed `AsChunk` trait to support capturing wrapped Lua types
+
 ## v0.9.0-rc.1
 
 - `UserDataMethods::add_async_method()` takes `&T` instead of cloning `T`
@@ -73,6 +116,18 @@ Other:
 - Support setting module name in `#[lua_module(name = "...")]` macro
 - Minor fixes and improvements
 
+## v0.8.10
+
+- Update to Luau 0.590 (luau0-src to 0.7.x)
+- Fix loading luau code starting with \t
+- Pin lua-src and luajit-src versions
+
+## v0.8.9
+
+- Update minimal (vendored) Lua 5.4 to 5.4.6
+- Use `lua_closethread` instead of `lua_resetthread` in vendored mode (Lua 5.4.6)
+- Allow deserializing Lua null into unit (`()`) or unit struct.
+
 ## v0.8.8
 
 - Fix potential deadlock when trying to reuse dropped registry keys.

Cargo.toml

@@ -1,7 +1,8 @@
 [package]
 name = "mlua"
-version = "0.9.0-rc.1" # remember to update mlua_derive
+version = "0.9.2" # remember to update mlua_derive
 authors = ["Aleksandr Orlenko <zxteam@pm.me>", "kyren <catherine@chucklefish.org>"]
+rust-version = "1.71"
 edition = "2021"
 repository = "https://github.com/khvzak/mlua"
 documentation = "https://docs.rs/mlua"
@@ -31,7 +32,7 @@ lua52 = ["ffi/lua52"]
 lua51 = ["ffi/lua51"]
 luajit = ["ffi/luajit"]
 luajit52 = ["luajit", "ffi/luajit52"]
-luau = ["ffi/luau"]
+luau = ["ffi/luau", "libloading"]
 luau-jit = ["luau", "ffi/luau-codegen"]
 luau-vector4 = ["luau", "ffi/luau-vector4"]
 vendored = ["ffi/vendored"]
@@ -43,7 +44,7 @@ macros = ["mlua_derive/macros"]
 unstable = []
 
 [dependencies]
-mlua_derive = { version = "=0.9.0-rc.1", optional = true, path = "mlua_derive" }
+mlua_derive = { version = "=0.9.0", optional = true, path = "mlua_derive" }
 bstr = { version = "1.0", features = ["std"], default_features = false }
 once_cell = { version = "1.0" }
 num-traits = { version = "0.2.14" }
@@ -54,7 +55,10 @@ erased-serde = { version = "0.3", optional = true }
 serde-value = { version = "0.7", optional = true }
 parking_lot = { version = "0.12", optional = true }
 
-ffi = { package = "mlua-sys", version = "0.2.1", path = "mlua-sys" }
+ffi = { package = "mlua-sys", version = "0.4.0", path = "mlua-sys" }
+
+[target.'cfg(unix)'.dependencies]
+libloading = { version = "0.8", optional = true }
 
 [dev-dependencies]
 rustyline = "12.0"
@@ -75,6 +79,11 @@ name = "benchmark"
 harness = false
 required-features = ["async"]
 
+[[bench]]
+name = "serde"
+harness = false
+required-features = ["serialize"]
+
 [[example]]
 name = "async_http_client"
 required-features = ["async", "macros"]

README.md

@@ -9,7 +9,7 @@
 [docs.rs]: https://docs.rs/mlua
 [Coverage Status]: https://codecov.io/gh/khvzak/mlua/branch/master/graph/badge.svg?token=99339FS1CG
 [codecov.io]: https://codecov.io/gh/khvzak/mlua
-[MSRV]: https://img.shields.io/badge/rust-1.63+-brightgreen.svg?&logo=rust
+[MSRV]: https://img.shields.io/badge/rust-1.71+-brightgreen.svg?&logo=rust
 
 [Guided Tour] | [Benchmarks] | [FAQ]
 
@@ -19,7 +19,7 @@
 
 > **Note**
 >
-> Please see the [v0.8](https://github.com/khvzak/mlua/tree/v0.8) branch for the stable versions of `mlua` released to crates.io.
+> See v0.9 [release notes](https://github.com/khvzak/mlua/blob/master/docs/release_notes/v0.9.md).
 
 `mlua` is bindings to [Lua](https://www.lua.org) programming language for Rust with a goal to provide
 _safe_ (as far as it's possible), high level, easy to use, practical and flexible API.
@@ -45,7 +45,7 @@ Below is a list of the available feature flags. By default `mlua` does not enabl
 * `luajit`: activate [LuaJIT] support
 * `luajit52`: activate [LuaJIT] support with partial compatibility with Lua 5.2
 * `luau`: activate [Luau] support (auto vendored mode)
-* `luau-jit`: activate [Luau] support with experimental jit backend. This is unstable feature and not recommended to use.
+* `luau-jit`: activate [Luau] support with JIT backend.
 * `luau-vector4`: activate [Luau] support with 4-dimensional vector.
 * `vendored`: build static Lua(JIT) library from sources during `mlua` compilation using [lua-src] or [luajit-src] crates
 * `module`: enable module mode (building loadable `cdylib` library for Lua)
@@ -98,12 +98,12 @@ You have to enable one of the features: `lua54`, `lua53`, `lua52`, `lua51`, `lua
 
 By default `mlua` uses `pkg-config` tool to find lua includes and libraries for the chosen Lua version.
 In most cases it works as desired, although sometimes could be more preferable to use a custom lua library.
-To achieve this, mlua supports `LUA_INC`, `LUA_LIB`, `LUA_LIB_NAME` and `LUA_LINK` environment variables.
+To achieve this, mlua supports `LUA_LIB`, `LUA_LIB_NAME` and `LUA_LINK` environment variables.
 `LUA_LINK` is optional and may be `dylib` (a dynamic library) or `static` (a static library, `.a` archive).
 
 An example how to use them:
 ``` sh
-my_project $ LUA_INC=$HOME/tmp/lua-5.2.4/src LUA_LIB=$HOME/tmp/lua-5.2.4/src LUA_LIB_NAME=lua LUA_LINK=static cargo build
+my_project $ LUA_LIB=$HOME/tmp/lua-5.2.4/src LUA_LIB_NAME=lua LUA_LINK=static cargo build
 ```
 
 `mlua` also supports vendored lua/luajit using the auxiliary crates [lua-src](https://crates.io/crates/lua-src) and
@@ -117,7 +117,7 @@ Add to `Cargo.toml` :
 
 ``` toml
 [dependencies]
-mlua = { version = "0.8", features = ["lua54", "vendored"] }
+mlua = { version = "0.9.1", features = ["lua54", "vendored"] }
 ```
 
 `main.rs`
@@ -152,7 +152,7 @@ Add to `Cargo.toml` :
 crate-type = ["cdylib"]
 
 [dependencies]
-mlua = { version = "0.8", features = ["lua54", "vendored", "module"] }
+mlua = { version = "0.9.1", features = ["lua54", "module"] }
 ```
 
 `lib.rs` :
@@ -197,13 +197,11 @@ rustflags = [
 ]
 ```
 On Linux you can build modules normally with `cargo build --release`.
-Vendored and non-vendored builds are supported for these OS.
 
-On Windows `vendored` mode for modules is not supported since you need to link to a Lua dll.
-Easiest way is to use either MinGW64 (as part of [MSYS2](https://github.com/msys2/msys2) package) with `pkg-config` or
-MSVC with `LUA_INC` / `LUA_LIB` / `LUA_LIB_NAME` environment variables.
+On Windows the target module will be linked with `lua5x.dll` library (depending on your feature flags).
+Your main application should provide this library.
 
-More details about compiling and linking Lua modules can be found on the [Building Modules](http://lua-users.org/wiki/BuildingModules) page.
+Module builds don't require Lua lib or headers to be installed on the system.
 
 ### Publishing to luarocks.org
 

benches/benchmark.rs

@@ -59,6 +59,77 @@ fn create_string_table(c: &mut Criterion) {
     });
 }
 
+fn table_get_set(c: &mut Criterion) {
+    let lua = Lua::new();
+
+    let table = lua.create_table().unwrap();
+
+    c.bench_function("table raw_get and raw_set [10]", |b| {
+        b.iter_batched(
+            || {
+                collect_gc_twice(&lua);
+                table.clear().unwrap();
+            },
+            |_| {
+                for (i, &s) in ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"]
+                    .iter()
+                    .enumerate()
+                {
+                    table.raw_set(s, i).unwrap();
+                    assert_eq!(table.raw_get::<_, usize>(s).unwrap(), i);
+                }
+            },
+            BatchSize::SmallInput,
+        );
+    });
+}
+
+fn table_traversal_pairs(c: &mut Criterion) {
+    let lua = Lua::new();
+
+    c.bench_function("table traversal [pairs]", |b| {
+        b.iter_batched(
+            || lua.globals(),
+            |globals| {
+                for kv in globals.pairs::<String, LuaValue>() {
+                    let (_k, _v) = kv.unwrap();
+                }
+            },
+            BatchSize::SmallInput,
+        );
+    });
+}
+
+fn table_traversal_for_each(c: &mut Criterion) {
+    let lua = Lua::new();
+
+    c.bench_function("table traversal [for_each]", |b| {
+        b.iter_batched(
+            || lua.globals(),
+            |globals| globals.for_each::<String, LuaValue>(|_k, _v| Ok(())),
+            BatchSize::SmallInput,
+        );
+    });
+}
+
+fn table_traversal_sequence(c: &mut Criterion) {
+    let lua = Lua::new();
+
+    let table = lua.create_sequence_from(1..1000).unwrap();
+
+    c.bench_function("table traversal [sequence]", |b| {
+        b.iter_batched(
+            || table.clone(),
+            |table| {
+                for v in table.sequence_values::<i32>() {
+                    let _i = v.unwrap();
+                }
+            },
+            BatchSize::SmallInput,
+        );
+    });
+}
+
 fn create_function(c: &mut Criterion) {
     let lua = Lua::new();
 
@@ -305,6 +376,10 @@ criterion_group! {
         create_table,
         create_array,
         create_string_table,
+        table_get_set,
+        table_traversal_pairs,
+        table_traversal_for_each,
+        table_traversal_sequence,
         create_function,
         call_lua_function,
         call_sum_callback,

benches/serde.rs

@@ -0,0 +1,64 @@
+use criterion::{criterion_group, criterion_main, BatchSize, Criterion};
+use std::time::Duration;
+
+use mlua::prelude::*;
+
+fn collect_gc_twice(lua: &Lua) {
+    lua.gc_collect().unwrap();
+    lua.gc_collect().unwrap();
+}
+
+fn serialize_json(c: &mut Criterion) {
+    let lua = Lua::new();
+
+    lua.globals()
+        .set(
+            "encode",
+            LuaFunction::wrap(|_, t: LuaValue| Ok(serde_json::to_string(&t).unwrap())),
+        )
+        .unwrap();
+
+    c.bench_function("serialize table to json [10]", |b| {
+        b.iter_batched(
+            || {
+                collect_gc_twice(&lua);
+                lua.load(
+                    r#"
+                local encode = encode
+                return function()
+                    for i = 1, 10 do
+                        encode({
+                            name = "Clark Kent",
+                            nickname = "Superman",
+                            address = {
+                                city = "Metropolis",
+                            },
+                            age = 32,
+                            superman = true,
+                        })
+                    end
+                end
+            "#,
+                )
+                .eval::<LuaFunction>()
+                .unwrap()
+            },
+            |func| {
+                func.call::<_, ()>(()).unwrap();
+            },
+            BatchSize::SmallInput,
+        );
+    });
+}
+
+criterion_group! {
+    name = benches;
+    config = Criterion::default()
+        .sample_size(300)
+        .measurement_time(Duration::from_secs(10))
+        .noise_threshold(0.02);
+    targets =
+        serialize_json,
+}
+
+criterion_main!(benches);

docs/release_notes/v0.9.md

@@ -0,0 +1,361 @@
+## mlua v0.9 release notes
+
+The v0.9 version of mlua is a major release that includes a number of API changes and improvements. This release is a stepping stone towards the v1.0.
+This document highlights the most important changes. For a full list of changes, see the [CHANGELOG].
+
+[CHANGELOG]: https://github.com/khvzak/mlua/blob/master/CHANGELOG.md
+
+### New features
+
+#### 1. New Any UserData API
+
+This is a long awaited feature that allows to register in Lua foreign types that cannot implement `UserData` trait because of the Rust orphan rules.
+
+Now you can register any type that implements [`Any`] trait as a userdata type.
+
+Consider the following example:
+
+```rust
+lua.register_userdata_type::<std::string::String>(|reg| {
+    reg.add_method("len", |_, this, ()| Ok(this.len()));
+
+    reg.add_method_mut("push", |_, this, s: String| {
+        this.push_str(&s);
+        Ok(())
+    });
+
+    reg.add_meta_method(MetaMethod::ToString, |lua, this, ()| lua.create_string(this));
+})?;
+
+let s = lua.create_any_userdata("hello".to_string())?;
+lua.load(chunk! {
+    print("s:len() is " .. $s:len())
+    $s:push(" world")
+    // Prints: hello, world
+    print($s)
+})
+.exec()?;
+```
+
+In this example we registered [`std::string::String`] as a userdata type with a set of methods and then created an instance of this type in Lua.
+
+It's _not_ required to register a type before using the `Lua::create_any_userdata()` method, instead an empty metatable will be created for you.
+You can also register the same type multiple times with different methods. Any previously created instances will share the old metatable, while new instances will have the new one.
+
+The new set of API is called `any_userdata` because it allows to register types that implements [`Any`] trait.
+
+[`std::string::String`]: https://doc.rust-lang.org/stable/std/string/struct.String.html
+[`Any`]: https://doc.rust-lang.org/stable/std/any/trait.Any.html
+
+#### 2. Scope support for the new any userdata types
+
+When you need to create non-static userdata instances in Lua, the usual way is use `Lua::scope()` helper to make them scoped. When out of scope, any scoped objects will be automatically
+dropped. The only downside of this approach is that every new instance will have a new metatable. This is not very fast if you need to create a lot of instances.
+
+With the new Any UserData API, you can place non-static references `&T` where `T: 'static` into a scope and they will share a single static metatable.
+
+```rust
+lua.register_userdata_type::<std::string::String>(|reg| {
+    reg.add_method_mut("replace", |_, this, (pat, to): (String, String)| {
+        *this = this.replace(&pat, &to);
+        Ok(())
+    });
+
+    reg.add_meta_method(MetaMethod::ToString, |lua, this, ()| lua.create_string(this));
+})?;
+
+let mut s = "hello, world".to_string();
+
+lua.scope(|scope| {
+    // This userdata instance holds only a mutable reference to our string
+    let ud = scope.create_any_userdata_ref_mut(&mut s)?;
+    lua.load(chunk! {
+        $ud:replace("world", "user")
+    })
+    .exec()
+})?;
+
+// Prints: hello, user!
+println!("{s}!");
+```
+
+#### 3. Owned types (`unstable`)
+
+One of the common questions was how to embed a Lua type into Rust struct to use it later. It was non-trivial to do because of the `'lua` lifetime attached to every Lua value.
+
+In v0.9 mlua introduces "owned" types `OwnedTable`/`OwnedFunction`/`OwnedString`/`OwnedAnyUserData`/ `OwnedThread`that are `'static` (no lifetime attached).
+
+```rust
+let lua = Lua::new();
+
+struct MyStruct {
+    table: OwnedTable,
+    func: OwnedFunction,
+}
+
+let my_struct = MyStruct {
+    table: lua.globals().into_owned(),
+    func: lua
+        .create_function(|_, t: Table| Ok(format!("{t:#?}")))?
+        .into_owned(),
+};
+
+// It's safe to drop Lua!
+drop(lua);
+
+let result = my_struct.func.call::<_, String>(my_struct.table)?;
+println!("{result}");
+```
+
+Prior to v0.9, it was possible to do by creating a reference to the Lua value in registry using `Lua::create_registry_value()`
+and retrieving value later using `Lua::registry_value()` method.
+
+All owned handles hold a *strong* reference to the current Lua instance.
+Be warned, if you place them into a Lua type (eg. `UserData` or a Rust callback), it is *very easy*
+to accidentally cause reference cycles that would prevent destroying Lua instance.
+
+Please note this functionality is available under the `unstable` feature flag and not available when the `send` feature is enabled.
+
+#### New ffi module
+
+In v0.9 release the internal `ffi` module has been moved into the new [`mlua-sys`] crate and became available for public use.
+This crate provides unified Lua FFI API (targeting Lua 5.4) using a (limited) compatibility layer for older versions.
+
+mlua re-exports the `ffi` module aliasing the `mlua-sys` crate and provides (unsafe) functionality to work with raw Lua state:
+
+```rust
+unsafe {
+    unsafe extern "C-unwind" fn lua_add(state: *mut mlua::lua_State) -> i32 {
+        let a = mlua::ffi::luaL_checkinteger(state, 1);
+        let b = mlua::ffi::luaL_checkinteger(state, 2);
+        mlua::ffi::lua_pushinteger(state, a + b);
+        1
+    }
+
+    let add = lua.create_c_function(lua_add)?;
+    assert_eq!(add.call::<_, i32>((2, 3))?, 5);
+}
+```
+
+[`mlua-sys`]: https://crates.io/crates/mlua-sys
+
+#### Luau JIT support
+
+mlua brings support for the new [Luau] JIT backend under the `luau-jit` feature flag.
+
+It will automatically trigger JIT compilation for new Lua chunks. To disable it, just call `lua.enable_jit(false)` before loading Lua code
+(but any previously compiled chunks will remain JIT-compiled).
+
+[Luau]: https://luau-lang.org
+
+### Improvements
+
+#### 1. Better error reporting
+
+When calling a Rust function from Lua and passing wrong arguments, previous mlua versions reported a error message without any context or reference to the particular argument.
+
+In v0.9 it reports a error message with the argument index and expected type:
+
+```rust
+let func = lua.create_function(|_, _a: i32| Ok(()))?;
+lua.load(chunk! {
+    local ok, err = pcall($func, "not a number")
+    // Prints: bad argument #1: error converting Lua string to i32 (expected number or string coercible to number)
+    print(err)
+})
+.exec()?;
+```
+
+Similar changes have been made for userdata functions and methods:
+
+```rust
+lua.register_userdata_type::<&'static str>(|reg| {
+    reg.add_method("len", |_, this, ()| Ok(this.len()));
+})?;
+
+let s = lua.create_any_userdata("hello")?;
+lua.load(chunk! {
+    local ok, err = pcall($s.len, 123)
+    // Prints: bad argument `self` to `&str.len`: error converting Lua integer to userdata
+    print(err)
+})
+.exec()?;
+```
+
+#### 2. Error context
+
+Similar to the [`anyhow`] Error type, now it's possible to attach context to Lua errors:
+
+```rust
+let read = lua.create_function(|lua, path: String| {
+    let bytes = std::fs::read(&path)
+        .into_lua_err()
+        .context(format!("Failed to open `{path}`"))?;
+    Ok(lua.create_string(bytes))
+})?;
+
+lua.load(chunk! {
+    local ok, err = pcall($read, "/nonexistent")
+    /// Prints:
+    /// Failed to open /nonexistent
+    /// No such file or directory (os error 2)
+    /// stack traceback:
+    /// ...
+    print(err)
+})
+.exec()?;
+```
+
+[`anyhow`]: https://crates.io/crates/anyhow
+
+#### 4. New methods `Function::wrap`/`AnyUserData::wrap`
+
+Sometimes it's useful to have `IntoLua` trait implementation for a Rust function or type `T: Any` without needing to call `Lua::create_function()`/`Lua::create_any_userdata()` methods.
+Since v0.9 you can call the new methods `Function::wrap()`/`AnyUserData::wrap()` that allows to do this. They return an abstract type that `impl IntoLua`:
+
+```rust
+lua.globals().set("print_rust", Function::wrap(|_, s: String| Ok(println!("{}", s))))?;
+lua.globals().set("rust_ud", AnyUserData::wrap("hello"))?;
+```
+
+In addition there are also `Function::wrap_mut()`/`Function::wrap_async()` methods that allow to wrap mutable and async functions respectively.
+
+For a `T: 'UserData + 'static` the `IntoLua` trait is still always implemented.
+
+#### `UserDataRef` and `UserDataRefMut` type wrappers
+
+The new wrappers `UserDataRef` and `UserDataRefMut` are receivers for userdata type `T` and borrow underlying instance for the lifetime of the wrapper.
+
+```rust
+lua.globals()
+    .set("ud", AnyUserData::wrap("hello".to_string()))?;
+
+let mut ud_mut: UserDataRefMut<String> = lua.globals().get("ud")?;
+ud_mut.push_str(", Rust");
+drop(ud_mut);
+
+let ud_ref: UserDataRef<String> = lua.globals().get("ud")?;
+// Prints: hello, Rust
+println!("{}", *ud_ref);
+```
+
+In the previous mlua versions the same functionality can be achieved by receiving `AnyUserData` and calling `AnyUserData::borrow()`/`AnyUserData::borrow_mut()` methods.
+
+The new wrappers are identical to Rust [`Ref`]/[`RefMut`] types.
+
+[`Ref`]: https://doc.rust-lang.org/std/cell/struct.Ref.html
+[`RefMut`]: https://doc.rust-lang.org/std/cell/struct.RefMut.html
+
+#### New `AnyUserDataExt` trait
+
+Similar to the `TableExt` trait, the `AnyUserDataExt` provides a set of extra methods for the `AnyUserData` type.
+
+1) `AnyUserDataExt::get()/set()` to get/set a value by key from the userdata, assuming it has `__index` metamethod.
+
+2) `AnyUserDataExt::call()` to call the userdata as a function assuming it has `__call` metamethod.
+
+3) `AnyUserData::call_method(name, ...)` to call the userdata method, assuming it has `__index` metamethod and the associated function.
+
+#### Pretty formatting Lua values
+
+`mlua::Value` implements a new format `:#?` that allows to (recursively) pretty print Lua values:
+
+```rust
+println!("{:#?}", lua.globals());
+```
+
+Prints:
+```
+{
+  ["_G"] = table: 0x7fa2d0706260,
+  ["_VERSION"] = "Lua 5.4",
+  ["assert"] = function: 0x10451d11d,
+  ["collectgarbage"] = function: 0x10451d198,
+  ["coroutine"] = {
+    ["close"] = function: 0x10451e28f,
+    ...
+  },
+  ["dofile"] = function: 0x10451d37c,
+  ...
+}
+```
+
+In addition a new method `Value::to_string()` has been added to convert `Value` to a string (using `__tostring` metamethod if available).
+
+#### Environment for Lua functions
+
+Any Lua functions have an associated environment table that is used to resolve global variables. By default it sets to a Lua globals table.
+
+In the new release it's possible to get or update a function environment using `Function::environment()` or `Function::set_environment()` methods respectively.
+
+```rust
+let f = lua.load("return a").into_function()?;
+
+assert_eq!(f.environment(), Some(lua.globals()));
+
+lua.globals().set("a", 1)?;
+assert_eq!(f.call::<_, i32>(())?, 1);
+
+f.set_environment(lua.create_table_from([("a", "hello")])?)?;
+assert_eq!(f.call::<_, mlua::String>(())?, "hello");
+```
+
+#### Performance optimizations
+
+The new mlua version has a number of performance improvements. Please check the [benchmarks results] to see how mlua compares to rlua and rhai.
+
+[benchmarks results]: https://github.com/khvzak/script-bench-rs
+
+### Changes in `module` mode
+
+#### New attributes
+
+The `lua_module` macro now support the following attributes:
+
+- `name=...` - sets name of the module (defaults to the name of the function).
+
+Eg.:
+
+```rust
+#[mlua::lua_module(name = "alt_module")]
+fn my_module(lua: &Lua) -> LuaResult<LuaTable> {
+    lua.create_table()
+}
+```
+
+Under the hood a new function `luaopen_alt_module` will be created for the Lua module loader.
+
+- `skip_memory_check` - skip memory allocation checks for some operations.
+
+In module mode, mlua runs in unknown environment and cannot say are there any memory limits or not. As result, some operations that require memory allocation runs in
+protected mode. Setting this attribute will improve performance of such operations with risk of having uncaught exceptions and memory leaks.
+
+#### Improved Windows target
+
+In previous mlua versions, building a Lua module for Windows requires having Lua development libraries installed on the system.
+In contrast, on Linux and macOS, modules can be built without any external dependencies using the `-undefined=dynamic_lookup` linker flag.
+
+With Rust 1.71+ it's now possible to lift this restriction for Windows as well. You can build modules normally and they will be linked with
+`lua54.dll`/`lua53.dll`/`lua52.dll`/`lua51.dll` depending on the enabled Lua version.
+
+You still need to have the dll although, linked to application where the module will be loaded.
+
+### Breaking changes
+
+1) `ToLua`/`ToLuaMulti` traits have been renamed to `IntoLua`/`IntoLuaMulti` respectively (with the methods called `into_lua`/`into_lua_multi`).
+
+The main reason for this change is following the Rust self [convention](https://rust-lang.github.io/rust-clippy/master/index.html#/wrong_self_convention).
+
+2) Removed `FromLua` implementation for `T: UserData + Clone`.
+
+During the usage of mlua, it was found that this implementation is not very useful and prevents custom `FromLua` implementations for `T: UserData`.
+It should be a developer decision to opt-in `FromLua` for their `T` if needed rather than having enabled it unconditionally.
+
+To opt-in `FromLua` for `T: Clone` you can use a simple `#[derive(FromLua)]` macro (requires `feature = "macros"`):
+
+```rust
+#[derive(Clone, Copy, mlua::FromLua)]
+struct MyUserData(i32);
+```
+
+`T` is not required to implement `UserData` because of the new relaxed restrictions on userdata types.

mlua-sys/Cargo.toml

@@ -1,7 +1,8 @@
 [package]
 name = "mlua-sys"
-version = "0.2.1"
+version = "0.4.0"
 authors = ["Aleksandr Orlenko <zxteam@pm.me>"]
+rust-version = "1.71"
 edition = "2021"
 repository = "https://github.com/khvzak/mlua"
 documentation = "https://docs.rs/mlua-sys"
@@ -37,6 +38,6 @@ module = []
 cc = "1.0"
 cfg-if = "1.0"
 pkg-config = "0.3.17"
-lua-src = { version = ">= 546.0.0, < 550.0.0", optional = true }
-luajit-src = { version = ">= 210.4.5, < 220.0.0", optional = true }
-luau0-src = { version = "0.5.11", optional = true }
+lua-src = { version = ">= 546.0.0, < 546.1.0", optional = true }
+luajit-src = { version = ">= 210.5.0, < 210.6.0", optional = true }
+luau0-src = { version = "0.7.8", optional = true }

mlua-sys/build/find_normal.rs

@@ -1,91 +1,52 @@
+#![allow(dead_code)]
+
 use std::env;
 use std::ops::Bound;
-use std::path::PathBuf;
 
-fn get_env_var(name: &str) -> String {
-    match env::var(name) {
-        Ok(val) => val,
-        Err(env::VarError::NotPresent) => String::new(),
-        Err(err) => panic!("cannot get {name}: {err}"),
-    }
-}
+pub fn probe_lua() {
+    let lib_dir = env::var("LUA_LIB").unwrap_or_default();
+    let lua_lib = env::var("LUA_LIB_NAME").unwrap_or_default();
 
-pub fn probe_lua() -> Option<PathBuf> {
-    let include_dir = get_env_var("LUA_INC");
-    let lib_dir = get_env_var("LUA_LIB");
-    let lua_lib = get_env_var("LUA_LIB_NAME");
-
-    println!("cargo:rerun-if-env-changed=LUA_INC");
     println!("cargo:rerun-if-env-changed=LUA_LIB");
     println!("cargo:rerun-if-env-changed=LUA_LIB_NAME");
     println!("cargo:rerun-if-env-changed=LUA_LINK");
 
-    let need_lua_lib = cfg!(any(not(feature = "module"), target_os = "windows"));
-
-    if !include_dir.is_empty() {
-        if need_lua_lib {
-            if lib_dir.is_empty() {
-                panic!("LUA_LIB is not set");
-            }
-            if lua_lib.is_empty() {
-                panic!("LUA_LIB_NAME is not set");
-            }
-
-            let mut link_lib = "";
-            if get_env_var("LUA_LINK") == "static" {
-                link_lib = "static=";
-            };
+    if !lua_lib.is_empty() {
+        if !lib_dir.is_empty() {
             println!("cargo:rustc-link-search=native={lib_dir}");
-            println!("cargo:rustc-link-lib={link_lib}{lua_lib}");
         }
-        return Some(PathBuf::from(include_dir));
+        let mut link_lib = "";
+        if env::var("LUA_LINK").as_deref() == Ok("static") {
+            link_lib = "static=";
+        };
+        println!("cargo:rustc-link-lib={link_lib}{lua_lib}");
+        return;
     }
 
     // Find using `pkg-config`
 
     #[cfg(feature = "lua54")]
-    let (incl_bound, excl_bound, alt_probe, ver) = ("5.4", "5.5", "lua5.4", "5.4");
+    let (incl_bound, excl_bound, alt_probe, ver) = ("5.4", "5.5", Some("lua5.4"), "5.4");
     #[cfg(feature = "lua53")]
-    let (incl_bound, excl_bound, alt_probe, ver) = ("5.3", "5.4", "lua5.3", "5.3");
+    let (incl_bound, excl_bound, alt_probe, ver) = ("5.3", "5.4", Some("lua5.3"), "5.3");
     #[cfg(feature = "lua52")]
-    let (incl_bound, excl_bound, alt_probe, ver) = ("5.2", "5.3", "lua5.2", "5.2");
+    let (incl_bound, excl_bound, alt_probe, ver) = ("5.2", "5.3", Some("lua5.2"), "5.2");
     #[cfg(feature = "lua51")]
-    let (incl_bound, excl_bound, alt_probe, ver) = ("5.1", "5.2", "lua5.1", "5.1");
-
-    #[cfg(any(
-        feature = "lua54",
-        feature = "lua53",
-        feature = "lua52",
-        feature = "lua51"
-    ))]
-    {
-        let mut lua = pkg_config::Config::new()
-            .range_version((Bound::Included(incl_bound), Bound::Excluded(excl_bound)))
-            .cargo_metadata(need_lua_lib)
-            .probe("lua");
-
-        if lua.is_err() {
-            lua = pkg_config::Config::new()
-                .cargo_metadata(need_lua_lib)
-                .probe(alt_probe);
-        }
-
-        lua.unwrap_or_else(|_| panic!("cannot find Lua {ver} using `pkg-config`"))
-            .include_paths
-            .get(0)
-            .cloned()
-    }
-
+    let (incl_bound, excl_bound, alt_probe, ver) = ("5.1", "5.2", Some("lua5.1"), "5.1");
     #[cfg(feature = "luajit")]
-    {
-        let lua = pkg_config::Config::new()
-            .range_version((Bound::Included("2.0.4"), Bound::Unbounded))
-            .cargo_metadata(need_lua_lib)
-            .probe("luajit");
+    let (incl_bound, excl_bound, alt_probe, ver) = ("2.0.4", "2.2", None, "JIT");
 
-        lua.expect("cannot find LuaJIT using `pkg-config`")
-            .include_paths
-            .get(0)
-            .cloned()
+    #[rustfmt::skip]
+    let mut lua = pkg_config::Config::new()
+        .range_version((Bound::Included(incl_bound), Bound::Excluded(excl_bound)))
+        .cargo_metadata(true)
+        .probe(if cfg!(feature = "luajit") { "luajit" } else { "lua" });
+
+    if lua.is_err() && alt_probe.is_some() {
+        lua = pkg_config::Config::new()
+            .cargo_metadata(true)
+            .probe(alt_probe.unwrap());
     }
+
+    lua.unwrap_or_else(|err| panic!("cannot find Lua{ver} using `pkg-config`: {err}"));
 }

mlua-sys/build/find_vendored.rs

@@ -1,6 +1,6 @@
-use std::path::PathBuf;
+#![allow(dead_code)]
 
-pub fn probe_lua() -> Option<PathBuf> {
+pub fn probe_lua() {
     #[cfg(feature = "lua54")]
     let artifacts = lua_src::Build::new().build(lua_src::Lua54);
 
@@ -25,6 +25,4 @@ pub fn probe_lua() -> Option<PathBuf> {
         .build();
 
     artifacts.print_cargo_metadata();
-
-    Some(artifacts.include_dir().to_owned())
 }

mlua-sys/build/main_inner.rs

@@ -9,18 +9,25 @@ cfg_if::cfg_if! {
 }
 
 fn main() {
-    // We don't support "vendored module" mode on windows
-    #[cfg(all(feature = "vendored", feature = "module", target_os = "windows"))]
-    compile_error!(
-        "Vendored (static) builds are not supported for modules on Windows.\n"
-            + "Please, use `pkg-config` or custom mode to link to a Lua dll."
-    );
+    #[cfg(all(feature = "luau", feature = "module", windows))]
+    compile_error!("Luau does not support `module` mode on Windows");
 
-    #[cfg(all(feature = "luau", feature = "module"))]
-    compile_error!("Luau does not support module mode");
-
-    #[cfg(any(not(feature = "module"), target_os = "windows"))]
-    find::probe_lua();
+    #[cfg(all(feature = "module", feature = "vendored"))]
+    compile_error!("`vendored` and `module` features are mutually exclusive");
 
     println!("cargo:rerun-if-changed=build");
+
+    #[cfg(windows)]
+    if cfg!(feature = "module") {
+        if !std::env::var("LUA_LIB_NAME").unwrap_or_default().is_empty() {
+            // Don't use raw-dylib linking
+            find::probe_lua();
+            return;
+        }
+
+        println!("cargo:rustc-cfg=raw_dylib");
+    }
+
+    #[cfg(not(feature = "module"))]
+    find::probe_lua();
 }

mlua-sys/src/lib.rs

@@ -26,14 +26,10 @@ pub use luau::*;
 #[doc(hidden)]
 pub const LUA_MAX_UPVALUES: c_int = 255;
 
-#[cfg(any(feature = "lua51", all(feature = "luajit", not(feature = "vendored"))))]
+#[cfg(any(feature = "lua51", feature = "luajit"))]
 #[doc(hidden)]
 pub const LUA_MAX_UPVALUES: c_int = 60;
 
-#[cfg(all(feature = "luajit", feature = "vendored"))]
-#[doc(hidden)]
-pub const LUA_MAX_UPVALUES: c_int = 120;
-
 #[cfg(feature = "luau")]
 #[doc(hidden)]
 pub const LUA_MAX_UPVALUES: c_int = 200;

mlua-sys/src/lua51/lauxlib.rs

@@ -14,7 +14,8 @@ pub struct luaL_Reg {
     pub func: lua_CFunction,
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaL_register(L: *mut lua_State, libname: *const c_char, l: *const luaL_Reg);
     #[link_name = "luaL_getmetafield"]
     pub fn luaL_getmetafield_(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
@@ -56,7 +57,8 @@ extern "C" {
 pub const LUA_NOREF: c_int = -2;
 pub const LUA_REFNIL: c_int = -1;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaL_ref(L: *mut lua_State, t: c_int) -> c_int;
     pub fn luaL_unref(L: *mut lua_State, t: c_int, r#ref: c_int);
 

mlua-sys/src/lua51/lua.rs

@@ -73,23 +73,23 @@ pub type lua_Integer = i32;
 pub type lua_Integer = i64;
 
 /// Type for native C functions that can be passed to Lua.
-pub type lua_CFunction = unsafe extern "C" fn(L: *mut lua_State) -> c_int;
+pub type lua_CFunction = unsafe extern "C-unwind" fn(L: *mut lua_State) -> c_int;
 
 // Type for functions that read/write blocks when loading/dumping Lua chunks
+#[rustfmt::skip]
 pub type lua_Reader =
-    unsafe extern "C" fn(L: *mut lua_State, ud: *mut c_void, sz: *mut usize) -> *const c_char;
+    unsafe extern "C-unwind" fn(L: *mut lua_State, ud: *mut c_void, sz: *mut usize) -> *const c_char;
+#[rustfmt::skip]
 pub type lua_Writer =
-    unsafe extern "C" fn(L: *mut lua_State, p: *const c_void, sz: usize, ud: *mut c_void) -> c_int;
+    unsafe extern "C-unwind" fn(L: *mut lua_State, p: *const c_void, sz: usize, ud: *mut c_void) -> c_int;
 
 /// Type for memory-allocation functions
-pub type lua_Alloc = unsafe extern "C" fn(
-    ud: *mut c_void,
-    ptr: *mut c_void,
-    osize: usize,
-    nsize: usize,
-) -> *mut c_void;
+#[rustfmt::skip]
+pub type lua_Alloc =
+    unsafe extern "C-unwind" fn(ud: *mut c_void, ptr: *mut c_void, osize: usize, nsize: usize) -> *mut c_void;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // State manipulation
     //
@@ -97,9 +97,6 @@ extern "C" {
     pub fn lua_close(L: *mut lua_State);
     pub fn lua_newthread(L: *mut lua_State) -> *mut lua_State;
 
-    #[cfg(all(feature = "luajit", feature = "vendored"))]
-    pub fn lua_resetthread(L: *mut lua_State, th: *mut lua_State);
-
     pub fn lua_atpanic(L: *mut lua_State, panicf: lua_CFunction) -> lua_CFunction;
 
     //
@@ -221,14 +218,16 @@ pub const LUA_GCSTEP: c_int = 5;
 pub const LUA_GCSETPAUSE: c_int = 6;
 pub const LUA_GCSETSTEPMUL: c_int = 7;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn lua_gc(L: *mut lua_State, what: c_int, data: c_int) -> c_int;
 }
 
 //
 // Miscellaneous functions
 //
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn lua_error(L: *mut lua_State) -> !;
     pub fn lua_next(L: *mut lua_State, idx: c_int) -> c_int;
     pub fn lua_concat(L: *mut lua_State, n: c_int);
@@ -351,9 +350,10 @@ pub const LUA_MASKLINE: c_int = 1 << (LUA_HOOKLINE as usize);
 pub const LUA_MASKCOUNT: c_int = 1 << (LUA_HOOKCOUNT as usize);
 
 /// Type for functions to be called on debug events.
-pub type lua_Hook = unsafe extern "C" fn(L: *mut lua_State, ar: *mut lua_Debug);
+pub type lua_Hook = unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug);
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn lua_getstack(L: *mut lua_State, level: c_int, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getinfo(L: *mut lua_State, what: *const c_char, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getlocal(L: *mut lua_State, ar: *const lua_Debug, n: c_int) -> *const c_char;

mlua-sys/src/lua51/lualib.rs

@@ -20,7 +20,8 @@ pub const LUA_JITLIBNAME: &str = "jit";
 #[cfg(feature = "luajit")]
 pub const LUA_FFILIBNAME: &str = "ffi";
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaopen_base(L: *mut lua_State) -> c_int;
     pub fn luaopen_table(L: *mut lua_State) -> c_int;
     pub fn luaopen_io(L: *mut lua_State) -> c_int;

mlua-sys/src/lua52/lauxlib.rs

@@ -14,7 +14,8 @@ pub struct luaL_Reg {
     pub func: lua_CFunction,
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaL_checkversion_(L: *mut lua_State, ver: lua_Number);
 
     #[link_name = "luaL_getmetafield"]
@@ -65,7 +66,8 @@ extern "C" {
 pub const LUA_NOREF: c_int = -2;
 pub const LUA_REFNIL: c_int = -1;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaL_ref(L: *mut lua_State, t: c_int) -> c_int;
     pub fn luaL_unref(L: *mut lua_State, t: c_int, r#ref: c_int);
 
@@ -78,7 +80,8 @@ pub unsafe fn luaL_loadfile(L: *mut lua_State, f: *const c_char) -> c_int {
     luaL_loadfilex(L, f, ptr::null())
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaL_loadbufferx(
         L: *mut lua_State,
         buff: *const c_char,

mlua-sys/src/lua52/lua.rs

@@ -78,23 +78,23 @@ pub type lua_Integer = i64;
 pub type lua_Unsigned = c_uint;
 
 /// Type for native C functions that can be passed to Lua
-pub type lua_CFunction = unsafe extern "C" fn(L: *mut lua_State) -> c_int;
+pub type lua_CFunction = unsafe extern "C-unwind" fn(L: *mut lua_State) -> c_int;
 
 // Type for functions that read/write blocks when loading/dumping Lua chunks
+#[rustfmt::skip]
 pub type lua_Reader =
-    unsafe extern "C" fn(L: *mut lua_State, ud: *mut c_void, sz: *mut usize) -> *const c_char;
+    unsafe extern "C-unwind" fn(L: *mut lua_State, ud: *mut c_void, sz: *mut usize) -> *const c_char;
+#[rustfmt::skip]
 pub type lua_Writer =
-    unsafe extern "C" fn(L: *mut lua_State, p: *const c_void, sz: usize, ud: *mut c_void) -> c_int;
+    unsafe extern "C-unwind" fn(L: *mut lua_State, p: *const c_void, sz: usize, ud: *mut c_void) -> c_int;
 
 /// Type for memory-allocation functions
-pub type lua_Alloc = unsafe extern "C" fn(
-    ud: *mut c_void,
-    ptr: *mut c_void,
-    osize: usize,
-    nsize: usize,
-) -> *mut c_void;
+#[rustfmt::skip]
+pub type lua_Alloc =
+    unsafe extern "C-unwind" fn(ud: *mut c_void, ptr: *mut c_void, osize: usize, nsize: usize) -> *mut c_void;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // State manipulation
     //
@@ -155,20 +155,19 @@ pub const LUA_OPMOD: c_int = 4;
 pub const LUA_OPPOW: c_int = 5;
 pub const LUA_OPUNM: c_int = 6;
 
-extern "C" {
-    pub fn lua_arith(L: *mut lua_State, op: c_int);
-}
-
 pub const LUA_OPEQ: c_int = 0;
 pub const LUA_OPLT: c_int = 1;
 pub const LUA_OPLE: c_int = 2;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
+extern "C-unwind" {
+    pub fn lua_arith(L: *mut lua_State, op: c_int);
     pub fn lua_rawequal(L: *mut lua_State, idx1: c_int, idx2: c_int) -> c_int;
     pub fn lua_compare(L: *mut lua_State, idx1: c_int, idx2: c_int, op: c_int) -> c_int;
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // Push functions (C -> stack)
     //
@@ -262,7 +261,8 @@ pub unsafe fn lua_pcall(L: *mut lua_State, n: c_int, r: c_int, f: c_int) -> c_in
     lua_pcallk(L, n, r, f, 0, None)
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // Coroutine functions
     //
@@ -298,11 +298,13 @@ pub const LUA_GCISRUNNING: c_int = 9;
 pub const LUA_GCGEN: c_int = 10;
 pub const LUA_GCINC: c_int = 11;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn lua_gc(L: *mut lua_State, what: c_int, data: c_int) -> c_int;
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // Miscellaneous functions
     //
@@ -437,9 +439,10 @@ pub const LUA_MASKLINE: c_int = 1 << (LUA_HOOKLINE as usize);
 pub const LUA_MASKCOUNT: c_int = 1 << (LUA_HOOKCOUNT as usize);
 
 /// Type for functions to be called on debug events.
-pub type lua_Hook = unsafe extern "C" fn(L: *mut lua_State, ar: *mut lua_Debug);
+pub type lua_Hook = unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug);
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn lua_getstack(L: *mut lua_State, level: c_int, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getinfo(L: *mut lua_State, what: *const c_char, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getlocal(L: *mut lua_State, ar: *const lua_Debug, n: c_int) -> *const c_char;

mlua-sys/src/lua52/lualib.rs

@@ -14,7 +14,8 @@ pub const LUA_MATHLIBNAME: &str = "math";
 pub const LUA_DBLIBNAME: &str = "debug";
 pub const LUA_LOADLIBNAME: &str = "package";
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaopen_base(L: *mut lua_State) -> c_int;
     pub fn luaopen_coroutine(L: *mut lua_State) -> c_int;
     pub fn luaopen_table(L: *mut lua_State) -> c_int;

mlua-sys/src/lua53/lauxlib.rs

@@ -20,7 +20,8 @@ pub struct luaL_Reg {
     pub func: lua_CFunction,
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaL_checkversion_(L: *mut lua_State, ver: lua_Number, sz: usize);
 
     pub fn luaL_getmetafield(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
@@ -67,7 +68,8 @@ extern "C" {
 pub const LUA_NOREF: c_int = -2;
 pub const LUA_REFNIL: c_int = -1;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaL_ref(L: *mut lua_State, t: c_int) -> c_int;
     pub fn luaL_unref(L: *mut lua_State, t: c_int, r#ref: c_int);
 
@@ -80,7 +82,8 @@ pub unsafe fn luaL_loadfile(L: *mut lua_State, f: *const c_char) -> c_int {
     luaL_loadfilex(L, f, ptr::null())
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaL_loadbufferx(
         L: *mut lua_State,
         buff: *const c_char,

mlua-sys/src/lua53/lua.rs

@@ -82,27 +82,27 @@ pub type lua_Unsigned = u64;
 pub type lua_KContext = isize;
 
 /// Type for native C functions that can be passed to Lua
-pub type lua_CFunction = unsafe extern "C" fn(L: *mut lua_State) -> c_int;
+pub type lua_CFunction = unsafe extern "C-unwind" fn(L: *mut lua_State) -> c_int;
 
 /// Type for continuation functions
 pub type lua_KFunction =
-    unsafe extern "C" fn(L: *mut lua_State, status: c_int, ctx: lua_KContext) -> c_int;
+    unsafe extern "C-unwind" fn(L: *mut lua_State, status: c_int, ctx: lua_KContext) -> c_int;
 
 // Type for functions that read/write blocks when loading/dumping Lua chunks
+#[rustfmt::skip]
 pub type lua_Reader =
-    unsafe extern "C" fn(L: *mut lua_State, ud: *mut c_void, sz: *mut usize) -> *const c_char;
+    unsafe extern "C-unwind" fn(L: *mut lua_State, ud: *mut c_void, sz: *mut usize) -> *const c_char;
+#[rustfmt::skip]
 pub type lua_Writer =
-    unsafe extern "C" fn(L: *mut lua_State, p: *const c_void, sz: usize, ud: *mut c_void) -> c_int;
+    unsafe extern "C-unwind" fn(L: *mut lua_State, p: *const c_void, sz: usize, ud: *mut c_void) -> c_int;
 
 /// Type for memory-allocation functions
-pub type lua_Alloc = unsafe extern "C" fn(
-    ud: *mut c_void,
-    ptr: *mut c_void,
-    osize: usize,
-    nsize: usize,
-) -> *mut c_void;
+#[rustfmt::skip]
+pub type lua_Alloc =
+    unsafe extern "C-unwind" fn(ud: *mut c_void, ptr: *mut c_void, osize: usize, nsize: usize) -> *mut c_void;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // State manipulation
     //
@@ -167,20 +167,19 @@ pub const LUA_OPSHR: c_int = 11;
 pub const LUA_OPUNM: c_int = 12;
 pub const LUA_OPBNOT: c_int = 13;
 
-extern "C" {
-    pub fn lua_arith(L: *mut lua_State, op: c_int);
-}
-
 pub const LUA_OPEQ: c_int = 0;
 pub const LUA_OPLT: c_int = 1;
 pub const LUA_OPLE: c_int = 2;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
+extern "C-unwind" {
+    pub fn lua_arith(L: *mut lua_State, op: c_int);
     pub fn lua_rawequal(L: *mut lua_State, idx1: c_int, idx2: c_int) -> c_int;
     pub fn lua_compare(L: *mut lua_State, idx1: c_int, idx2: c_int, op: c_int) -> c_int;
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // Push functions (C -> stack)
     //
@@ -270,7 +269,8 @@ pub unsafe fn lua_pcall(L: *mut lua_State, n: c_int, r: c_int, f: c_int) -> c_in
     lua_pcallk(L, n, r, f, 0, None)
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // Coroutine functions
     //
@@ -304,11 +304,13 @@ pub const LUA_GCSETPAUSE: c_int = 6;
 pub const LUA_GCSETSTEPMUL: c_int = 7;
 pub const LUA_GCISRUNNING: c_int = 9;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn lua_gc(L: *mut lua_State, what: c_int, data: c_int) -> c_int;
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // Miscellaneous functions
     //
@@ -461,9 +463,10 @@ pub const LUA_MASKLINE: c_int = 1 << (LUA_HOOKLINE as usize);
 pub const LUA_MASKCOUNT: c_int = 1 << (LUA_HOOKCOUNT as usize);
 
 /// Type for functions to be called on debug events.
-pub type lua_Hook = unsafe extern "C" fn(L: *mut lua_State, ar: *mut lua_Debug);
+pub type lua_Hook = unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug);
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn lua_getstack(L: *mut lua_State, level: c_int, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getinfo(L: *mut lua_State, what: *const c_char, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getlocal(L: *mut lua_State, ar: *const lua_Debug, n: c_int) -> *const c_char;

mlua-sys/src/lua53/lualib.rs

@@ -15,7 +15,8 @@ pub const LUA_MATHLIBNAME: &str = "math";
 pub const LUA_DBLIBNAME: &str = "debug";
 pub const LUA_LOADLIBNAME: &str = "package";
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaopen_base(L: *mut lua_State) -> c_int;
     pub fn luaopen_coroutine(L: *mut lua_State) -> c_int;
     pub fn luaopen_table(L: *mut lua_State) -> c_int;

mlua-sys/src/lua54/lauxlib.rs

@@ -20,7 +20,8 @@ pub struct luaL_Reg {
     pub func: lua_CFunction,
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaL_checkversion_(L: *mut lua_State, ver: lua_Number, sz: usize);
 
     pub fn luaL_getmetafield(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
@@ -66,7 +67,8 @@ extern "C" {
 pub const LUA_NOREF: c_int = -2;
 pub const LUA_REFNIL: c_int = -1;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaL_ref(L: *mut lua_State, t: c_int) -> c_int;
     pub fn luaL_unref(L: *mut lua_State, t: c_int, r#ref: c_int);
 
@@ -79,7 +81,8 @@ pub unsafe fn luaL_loadfile(L: *mut lua_State, f: *const c_char) -> c_int {
     luaL_loadfilex(L, f, ptr::null())
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaL_loadbufferx(
         L: *mut lua_State,
         buff: *const c_char,

mlua-sys/src/lua54/lua.rs

@@ -81,31 +81,31 @@ pub type lua_Unsigned = u64;
 pub type lua_KContext = isize;
 
 /// Type for native C functions that can be passed to Lua
-pub type lua_CFunction = unsafe extern "C" fn(L: *mut lua_State) -> c_int;
+pub type lua_CFunction = unsafe extern "C-unwind" fn(L: *mut lua_State) -> c_int;
 
 /// Type for continuation functions
 pub type lua_KFunction =
-    unsafe extern "C" fn(L: *mut lua_State, status: c_int, ctx: lua_KContext) -> c_int;
+    unsafe extern "C-unwind" fn(L: *mut lua_State, status: c_int, ctx: lua_KContext) -> c_int;
 
 // Type for functions that read/write blocks when loading/dumping Lua chunks
+#[rustfmt::skip]
 pub type lua_Reader =
-    unsafe extern "C" fn(L: *mut lua_State, ud: *mut c_void, sz: *mut usize) -> *const c_char;
+    unsafe extern "C-unwind" fn(L: *mut lua_State, ud: *mut c_void, sz: *mut usize) -> *const c_char;
+#[rustfmt::skip]
 pub type lua_Writer =
-    unsafe extern "C" fn(L: *mut lua_State, p: *const c_void, sz: usize, ud: *mut c_void) -> c_int;
+    unsafe extern "C-unwind" fn(L: *mut lua_State, p: *const c_void, sz: usize, ud: *mut c_void) -> c_int;
 
 /// Type for memory-allocation functions
-pub type lua_Alloc = unsafe extern "C" fn(
-    ud: *mut c_void,
-    ptr: *mut c_void,
-    osize: usize,
-    nsize: usize,
-) -> *mut c_void;
+#[rustfmt::skip]
+pub type lua_Alloc =
+    unsafe extern "C-unwind" fn(ud: *mut c_void, ptr: *mut c_void, osize: usize, nsize: usize) -> *mut c_void;
 
 /// Type for warning functions
 pub type lua_WarnFunction =
-    unsafe extern "C" fn(ud: *mut c_void, msg: *const c_char, tocont: c_int);
+    unsafe extern "C-unwind" fn(ud: *mut c_void, msg: *const c_char, tocont: c_int);
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // State manipulation
     //
@@ -174,20 +174,19 @@ pub const LUA_OPSHR: c_int = 11;
 pub const LUA_OPUNM: c_int = 12;
 pub const LUA_OPBNOT: c_int = 13;
 
-extern "C" {
-    pub fn lua_arith(L: *mut lua_State, op: c_int);
-}
-
 pub const LUA_OPEQ: c_int = 0;
 pub const LUA_OPLT: c_int = 1;
 pub const LUA_OPLE: c_int = 2;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
+    pub fn lua_arith(L: *mut lua_State, op: c_int);
     pub fn lua_rawequal(L: *mut lua_State, idx1: c_int, idx2: c_int) -> c_int;
     pub fn lua_compare(L: *mut lua_State, idx1: c_int, idx2: c_int, op: c_int) -> c_int;
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // Push functions (C -> stack)
     //
@@ -277,7 +276,8 @@ pub unsafe fn lua_pcall(L: *mut lua_State, n: c_int, r: c_int, f: c_int) -> c_in
     lua_pcallk(L, n, r, f, 0, None)
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // Coroutine functions
     //
@@ -305,7 +305,8 @@ pub unsafe fn lua_yield(L: *mut lua_State, n: c_int) -> c_int {
 //
 // Warning-related functions
 //
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn lua_setwarnf(L: *mut lua_State, f: Option<lua_WarnFunction>, ud: *mut c_void);
     pub fn lua_warning(L: *mut lua_State, msg: *const c_char, tocont: c_int);
 }
@@ -325,11 +326,13 @@ pub const LUA_GCISRUNNING: c_int = 9;
 pub const LUA_GCGEN: c_int = 10;
 pub const LUA_GCINC: c_int = 11;
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn lua_gc(L: *mut lua_State, what: c_int, ...) -> c_int;
 }
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     //
     // Miscellaneous functions
     //
@@ -500,9 +503,10 @@ pub const LUA_MASKLINE: c_int = 1 << (LUA_HOOKLINE as usize);
 pub const LUA_MASKCOUNT: c_int = 1 << (LUA_HOOKCOUNT as usize);
 
 /// Type for functions to be called on debug events.
-pub type lua_Hook = unsafe extern "C" fn(L: *mut lua_State, ar: *mut lua_Debug);
+pub type lua_Hook = unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug);
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn lua_getstack(L: *mut lua_State, level: c_int, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getinfo(L: *mut lua_State, what: *const c_char, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getlocal(L: *mut lua_State, ar: *const lua_Debug, n: c_int) -> *const c_char;

mlua-sys/src/lua54/lualib.rs

@@ -14,7 +14,8 @@ pub const LUA_MATHLIBNAME: &str = "math";
 pub const LUA_DBLIBNAME: &str = "debug";
 pub const LUA_LOADLIBNAME: &str = "package";
 
-extern "C" {
+#[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
+extern "C-unwind" {
     pub fn luaopen_base(L: *mut lua_State) -> c_int;
     pub fn luaopen_coroutine(L: *mut lua_State) -> c_int;
     pub fn luaopen_table(L: *mut lua_State) -> c_int;

mlua-sys/src/luau/compat.rs

@@ -323,7 +323,7 @@ pub unsafe fn luaL_getmetafield(L: *mut lua_State, obj: c_int, e: *const c_char)
 pub unsafe fn luaL_newmetatable(L: *mut lua_State, tname: *const c_char) -> c_int {
     if luaL_newmetatable_(L, tname) != 0 {
         lua_pushstring(L, tname);
-        lua_setfield(L, -2, cstr!("__name"));
+        lua_setfield(L, -2, cstr!("__type"));
         1
     } else {
         0
@@ -341,7 +341,7 @@ pub unsafe fn luaL_loadbufferx(
         fn free(p: *mut c_void);
     }
 
-    let chunk_is_text = size == 0 || (*data as u8) >= b'\n';
+    let chunk_is_text = size == 0 || (*data as u8) >= b'\t';
     if !mode.is_null() {
         let modeb = CStr::from_ptr(mode).to_bytes();
         if !chunk_is_text && !modeb.contains(&b'b') {
@@ -454,7 +454,7 @@ pub unsafe fn luaL_tolstring(L: *mut lua_State, mut idx: c_int, len: *mut usize)
                 }
             }
             t => {
-                let tt = luaL_getmetafield(L, idx, cstr!("__name"));
+                let tt = luaL_getmetafield(L, idx, cstr!("__type"));
                 let name = if tt == LUA_TSTRING {
                     lua_tostring(L, -1)
                 } else {
@@ -462,7 +462,7 @@ pub unsafe fn luaL_tolstring(L: *mut lua_State, mut idx: c_int, len: *mut usize)
                 };
                 lua_pushfstring(L, cstr!("%s: %p"), name, lua_topointer(L, idx));
                 if tt != LUA_TNIL {
-                    lua_replace(L, -2); // remove '__name'
+                    lua_replace(L, -2); // remove '__type'
                 }
             }
         };

mlua-sys/src/luau/lauxlib.rs

@@ -13,7 +13,7 @@ pub struct luaL_Reg {
     pub func: lua_CFunction,
 }
 
-extern "C" {
+extern "C-unwind" {
     pub fn luaL_register(L: *mut lua_State, libname: *const c_char, l: *const luaL_Reg);
     #[link_name = "luaL_getmetafield"]
     pub fn luaL_getmetafield_(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
@@ -52,6 +52,8 @@ extern "C" {
     pub fn luaL_newmetatable_(L: *mut lua_State, tname: *const c_char) -> c_int;
     pub fn luaL_checkudata(L: *mut lua_State, ud: c_int, tname: *const c_char) -> *mut c_void;
 
+    pub fn luaL_checkbuffer(L: *mut lua_State, narg: c_int, len: *mut usize) -> *mut c_void;
+
     pub fn luaL_where(L: *mut lua_State, lvl: c_int);
 
     #[link_name = "luaL_errorL"]
@@ -152,5 +154,48 @@ pub unsafe fn luaL_sandbox(L: *mut lua_State, enabled: c_int) {
 }
 
 //
-// TODO: Generic Buffer Manipulation
+// Generic Buffer Manipulation
 //
+
+/// Buffer size used for on-stack string operations. This limit depends on native stack size.
+pub const LUA_BUFFERSIZE: usize = 512;
+
+#[repr(C)]
+pub struct luaL_Strbuf {
+    p: *mut c_char,   // current position in buffer
+    end: *mut c_char, // end of the current buffer
+    L: *mut lua_State,
+    storage: *mut c_void, // TString
+    buffer: [c_char; LUA_BUFFERSIZE],
+}
+
+// For compatibility
+pub type luaL_Buffer = luaL_Strbuf;
+
+extern "C-unwind" {
+    pub fn luaL_buffinit(L: *mut lua_State, B: *mut luaL_Strbuf);
+    pub fn luaL_buffinitsize(L: *mut lua_State, B: *mut luaL_Strbuf, size: usize) -> *mut c_char;
+    pub fn luaL_prepbuffsize(B: *mut luaL_Strbuf, size: usize) -> *mut c_char;
+    pub fn luaL_addlstring(B: *mut luaL_Strbuf, s: *const c_char, l: usize);
+    pub fn luaL_addvalue(B: *mut luaL_Strbuf);
+    pub fn luaL_addvalueany(B: *mut luaL_Strbuf, idx: c_int);
+    pub fn luaL_pushresult(B: *mut luaL_Strbuf);
+    pub fn luaL_pushresultsize(B: *mut luaL_Strbuf, size: usize);
+}
+
+pub unsafe fn luaL_addchar(B: *mut luaL_Strbuf, c: c_char) {
+    if (*B).p >= (*B).end {
+        luaL_prepbuffsize(B, 1);
+    }
+    *(*B).p = c;
+    (*B).p = (*B).p.add(1);
+}
+
+pub unsafe fn luaL_addstring(B: *mut luaL_Strbuf, s: *const c_char) {
+    // Calculate length of s
+    let mut len = 0;
+    while *s.add(len) != 0 {
+        len += 1;
+    }
+    luaL_addlstring(B, s, len);
+}

mlua-sys/src/luau/lua.rs

@@ -2,7 +2,7 @@
 
 use std::marker::{PhantomData, PhantomPinned};
 use std::os::raw::{c_char, c_double, c_float, c_int, c_uint, c_void};
-use std::ptr;
+use std::{mem, ptr};
 
 // Option for multiple returns in 'lua_pcall' and 'lua_call'
 pub const LUA_MULTRET: c_int = -1;
@@ -55,6 +55,7 @@ pub const LUA_TTABLE: c_int = 6;
 pub const LUA_TFUNCTION: c_int = 7;
 pub const LUA_TUSERDATA: c_int = 8;
 pub const LUA_TTHREAD: c_int = 9;
+pub const LUA_TBUFFER: c_int = 10;
 
 /// Guaranteed number of Lua stack slots available to a C function.
 pub const LUA_MINSTACK: c_int = 20;
@@ -69,15 +70,15 @@ pub type lua_Integer = c_int;
 pub type lua_Unsigned = c_uint;
 
 /// Type for native C functions that can be passed to Lua.
-pub type lua_CFunction = unsafe extern "C" fn(L: *mut lua_State) -> c_int;
-pub type lua_Continuation = unsafe extern "C" fn(L: *mut lua_State, status: c_int) -> c_int;
+pub type lua_CFunction = unsafe extern "C-unwind" fn(L: *mut lua_State) -> c_int;
+pub type lua_Continuation = unsafe extern "C-unwind" fn(L: *mut lua_State, status: c_int) -> c_int;
 
 /// Type for userdata destructor functions.
-pub type lua_Udestructor = unsafe extern "C" fn(*mut c_void);
-pub type lua_Destructor = unsafe extern "C" fn(L: *mut lua_State, *mut c_void);
+pub type lua_Udestructor = unsafe extern "C-unwind" fn(*mut c_void);
+pub type lua_Destructor = unsafe extern "C-unwind" fn(L: *mut lua_State, *mut c_void);
 
 /// Type for memory-allocation functions.
-pub type lua_Alloc = unsafe extern "C" fn(
+pub type lua_Alloc = unsafe extern "C-unwind" fn(
     ud: *mut c_void,
     ptr: *mut c_void,
     osize: usize,
@@ -89,7 +90,7 @@ pub const fn luau_version() -> Option<&'static str> {
     option_env!("LUAU_VERSION")
 }
 
-extern "C" {
+extern "C-unwind" {
     //
     // State manipulation
     //
@@ -147,6 +148,7 @@ extern "C" {
     pub fn lua_touserdatatagged(L: *mut lua_State, idx: c_int, tag: c_int) -> *mut c_void;
     pub fn lua_userdatatag(L: *mut lua_State, idx: c_int) -> c_int;
     pub fn lua_tothread(L: *mut lua_State, idx: c_int) -> *mut lua_State;
+    pub fn lua_tobuffer(L: *mut lua_State, idx: c_int, len: *mut usize) -> *mut c_void;
     pub fn lua_topointer(L: *mut lua_State, idx: c_int) -> *const c_void;
 
     //
@@ -181,6 +183,8 @@ extern "C" {
     pub fn lua_newuserdatatagged(L: *mut lua_State, sz: usize, tag: c_int) -> *mut c_void;
     pub fn lua_newuserdatadtor(L: *mut lua_State, sz: usize, dtor: lua_Udestructor) -> *mut c_void;
 
+    pub fn lua_newbuffer(L: *mut lua_State, sz: usize) -> *mut c_void;
+
     //
     // Get functions (Lua -> stack)
     //
@@ -251,14 +255,14 @@ pub const LUA_GCSETGOAL: c_int = 7;
 pub const LUA_GCSETSTEPMUL: c_int = 8;
 pub const LUA_GCSETSTEPSIZE: c_int = 9;
 
-extern "C" {
+extern "C-unwind" {
     pub fn lua_gc(L: *mut lua_State, what: c_int, data: c_int) -> c_int;
 }
 
 //
 // Memory statistics
 //
-extern "C" {
+extern "C-unwind" {
     pub fn lua_setmemcat(L: *mut lua_State, category: c_int);
     pub fn lua_totalbytes(L: *mut lua_State, category: c_int) -> usize;
 }
@@ -266,7 +270,7 @@ extern "C" {
 //
 // Miscellaneous functions
 //
-extern "C" {
+extern "C-unwind" {
     pub fn lua_error(L: *mut lua_State) -> !;
     pub fn lua_next(L: *mut lua_State, idx: c_int) -> c_int;
     pub fn lua_rawiter(L: *mut lua_State, idx: c_int, iter: c_int) -> c_int;
@@ -278,6 +282,7 @@ extern "C" {
     pub fn lua_getuserdatadtor(L: *mut lua_State, tag: c_int) -> Option<lua_Destructor>;
     pub fn lua_clonefunction(L: *mut lua_State, idx: c_int);
     pub fn lua_cleartable(L: *mut lua_State, idx: c_int);
+    pub fn lua_getallocf(L: *mut lua_State, ud: *mut *mut c_void) -> lua_Alloc;
 }
 
 //
@@ -286,7 +291,7 @@ extern "C" {
 pub const LUA_NOREF: c_int = -1;
 pub const LUA_REFNIL: c_int = 0;
 
-extern "C" {
+extern "C-unwind" {
     pub fn lua_ref(L: *mut lua_State, idx: c_int) -> c_int;
     pub fn lua_unref(L: *mut lua_State, r#ref: c_int);
 }
@@ -325,6 +330,15 @@ pub unsafe fn lua_newuserdata(L: *mut lua_State, sz: usize) -> *mut c_void {
     lua_newuserdatatagged(L, sz, 0)
 }
 
+#[inline(always)]
+pub unsafe fn lua_newuserdata_t<T>(L: *mut lua_State) -> *mut T {
+    unsafe extern "C-unwind" fn destructor<T>(ud: *mut c_void) {
+        ptr::drop_in_place(ud as *mut T);
+    }
+
+    lua_newuserdatadtor(L, mem::size_of::<T>(), destructor::<T>) as *mut T
+}
+
 // TODO: lua_strlen
 
 #[inline(always)]
@@ -362,6 +376,11 @@ pub unsafe fn lua_isthread(L: *mut lua_State, n: c_int) -> c_int {
     (lua_type(L, n) == LUA_TTHREAD) as c_int
 }
 
+#[inline(always)]
+pub unsafe fn lua_isbuffer(L: *mut lua_State, n: c_int) -> c_int {
+    (lua_type(L, n) == LUA_TBUFFER) as c_int
+}
+
 #[inline(always)]
 pub unsafe fn lua_isnone(L: *mut lua_State, n: c_int) -> c_int {
     (lua_type(L, n) == LUA_TNONE) as c_int
@@ -423,9 +442,9 @@ pub unsafe fn lua_tostring(L: *mut lua_State, i: c_int) -> *const c_char {
 const LUA_IDSIZE: usize = 256;
 
 /// Type for functions to be called on debug events.
-pub type lua_Hook = unsafe extern "C" fn(L: *mut lua_State, ar: *mut lua_Debug);
+pub type lua_Hook = unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug);
 
-pub type lua_Coverage = unsafe extern "C" fn(
+pub type lua_Coverage = unsafe extern "C-unwind" fn(
     context: *mut c_void,
     function: *const c_char,
     linedefined: c_int,
@@ -434,7 +453,7 @@ pub type lua_Coverage = unsafe extern "C" fn(
     size: usize,
 );
 
-extern "C" {
+extern "C-unwind" {
     pub fn lua_stackdepth(L: *mut lua_State) -> c_int;
     pub fn lua_getinfo(
         L: *mut lua_State,
@@ -492,23 +511,23 @@ pub struct lua_Callbacks {
     pub userdata: *mut c_void,
 
     /// gets called at safepoints (loop back edges, call/ret, gc) if set
-    pub interrupt: Option<unsafe extern "C" fn(L: *mut lua_State, gc: c_int)>,
+    pub interrupt: Option<unsafe extern "C-unwind" fn(L: *mut lua_State, gc: c_int)>,
     /// gets called when an unprotected error is raised (if longjmp is used)
-    pub panic: Option<unsafe extern "C" fn(L: *mut lua_State, errcode: c_int)>,
+    pub panic: Option<unsafe extern "C-unwind" fn(L: *mut lua_State, errcode: c_int)>,
 
     /// gets called when L is created (LP == parent) or destroyed (LP == NULL)
-    pub userthread: Option<unsafe extern "C" fn(LP: *mut lua_State, L: *mut lua_State)>,
+    pub userthread: Option<unsafe extern "C-unwind" fn(LP: *mut lua_State, L: *mut lua_State)>,
     /// gets called when a string is created; returned atom can be retrieved via tostringatom
-    pub useratom: Option<unsafe extern "C" fn(s: *const c_char, l: usize) -> i16>,
+    pub useratom: Option<unsafe extern "C-unwind" fn(s: *const c_char, l: usize) -> i16>,
 
     /// gets called when BREAK instruction is encountered
-    pub debugbreak: Option<unsafe extern "C" fn(L: *mut lua_State, ar: *mut lua_Debug)>,
+    pub debugbreak: Option<unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug)>,
     /// gets called after each instruction in single step mode
-    pub debugstep: Option<unsafe extern "C" fn(L: *mut lua_State, ar: *mut lua_Debug)>,
+    pub debugstep: Option<unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug)>,
     /// gets called when thread execution is interrupted by break in another thread
-    pub debuginterrupt: Option<unsafe extern "C" fn(L: *mut lua_State, ar: *mut lua_Debug)>,
+    pub debuginterrupt: Option<unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug)>,
     /// gets called when protected call results in an error
-    pub debugprotectederror: Option<unsafe extern "C" fn(L: *mut lua_State)>,
+    pub debugprotectederror: Option<unsafe extern "C-unwind" fn(L: *mut lua_State)>,
 }
 
 extern "C" {

mlua-sys/src/luau/luacode.rs

@@ -10,10 +10,11 @@ pub struct lua_CompileOptions {
     pub coverageLevel: c_int,
     pub vectorLib: *const c_char,
     pub vectorCtor: *const c_char,
-    pub mutableGlobals: *mut *const c_char,
+    pub vectorType: *const c_char,
+    pub mutableGlobals: *const *const c_char,
 }
 
-extern "C" {
+extern "C-unwind" {
     #[link_name = "luau_compile"]
     pub fn luau_compile_(
         source: *const c_char,
@@ -21,7 +22,9 @@ extern "C" {
         options: *mut lua_CompileOptions,
         outsize: *mut usize,
     ) -> *mut c_char;
+}
 
+extern "C" {
     fn free(p: *mut c_void);
 }
 

mlua-sys/src/luau/luacodegen.rs

@@ -4,7 +4,7 @@ use std::os::raw::c_int;
 
 use super::lua::lua_State;
 
-extern "C" {
+extern "C-unwind" {
     pub fn luau_codegen_supported() -> c_int;
     pub fn luau_codegen_create(state: *mut lua_State);
     pub fn luau_codegen_compile(state: *mut lua_State, idx: c_int);

mlua-sys/src/luau/lualib.rs

@@ -9,17 +9,19 @@ pub const LUA_TABLIBNAME: &str = "table";
 pub const LUA_OSLIBNAME: &str = "os";
 pub const LUA_STRLIBNAME: &str = "string";
 pub const LUA_BITLIBNAME: &str = "bit32";
+pub const LUA_BUFFERLIBNAME: &str = "buffer";
 pub const LUA_UTF8LIBNAME: &str = "utf8";
 pub const LUA_MATHLIBNAME: &str = "math";
 pub const LUA_DBLIBNAME: &str = "debug";
 
-extern "C" {
+extern "C-unwind" {
     pub fn luaopen_base(L: *mut lua_State) -> c_int;
     pub fn luaopen_coroutine(L: *mut lua_State) -> c_int;
     pub fn luaopen_table(L: *mut lua_State) -> c_int;
     pub fn luaopen_os(L: *mut lua_State) -> c_int;
     pub fn luaopen_string(L: *mut lua_State) -> c_int;
     pub fn luaopen_bit32(L: *mut lua_State) -> c_int;
+    pub fn luaopen_buffer(L: *mut lua_State) -> c_int;
     pub fn luaopen_utf8(L: *mut lua_State) -> c_int;
     pub fn luaopen_math(L: *mut lua_State) -> c_int;
     pub fn luaopen_debug(L: *mut lua_State) -> c_int;

mlua_derive/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mlua_derive"
-version = "0.9.0-rc.1"
+version = "0.9.0"
 authors = ["Aleksandr Orlenko <zxteam@pm.me>"]
 edition = "2021"
 description = "Procedural macros for the mlua crate."

mlua_derive/src/from_lua.rs

@@ -0,0 +1,32 @@
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::{parse_macro_input, DeriveInput};
+
+pub fn from_lua(input: TokenStream) -> TokenStream {
+    let DeriveInput {
+        ident, generics, ..
+    } = parse_macro_input!(input as DeriveInput);
+
+    let where_clause = match &generics.where_clause {
+        Some(where_clause) => quote! { #where_clause, Self: 'static + Clone },
+        None => quote! { where Self: 'static + Clone },
+    };
+    let ident_str = ident.to_string();
+
+    quote! {
+      impl #generics ::mlua::FromLua<'_> for #ident #generics #where_clause {
+        #[inline]
+        fn from_lua(value: ::mlua::Value<'_>, lua: &'_ ::mlua::Lua) -> ::mlua::Result<Self> {
+          match value {
+            ::mlua::Value::UserData(ud) => Ok(ud.borrow::<Self>()?.clone()),
+            _ => Err(::mlua::Error::FromLuaConversionError {
+                from: value.type_name(),
+                to: #ident_str,
+                message: None,
+            }),
+          }
+        }
+      }
+    }
+    .into()
+}

mlua_derive/src/lib.rs

@@ -59,14 +59,10 @@ pub fn lua_module(attr: TokenStream, item: TokenStream) -> TokenStream {
         #func
 
         #[no_mangle]
-        unsafe extern "C" fn #ext_entrypoint_name(state: *mut ::mlua::lua_State) -> ::std::os::raw::c_int {
+        unsafe extern "C-unwind" fn #ext_entrypoint_name(state: *mut ::mlua::lua_State) -> ::std::os::raw::c_int {
             let lua = ::mlua::Lua::init_from_ptr(state);
-            if #skip_memory_check {
-                lua.skip_memory_check(true);
-            }
-            lua
-                .entrypoint1(#func_name)
-                .expect("cannot initialize module")
+            lua.skip_memory_check(#skip_memory_check);
+            lua.entrypoint1(#func_name)
         }
     };
 
@@ -97,21 +93,20 @@ pub fn chunk(input: TokenStream) -> TokenStream {
     let wrapped_code = quote! {{
         use ::mlua::{AsChunk, ChunkMode, Lua, Result, Table};
         use ::std::borrow::Cow;
+        use ::std::cell::Cell;
         use ::std::io::Result as IoResult;
-        use ::std::sync::Mutex;
+        use ::std::marker::PhantomData;
 
-        struct InnerChunk<F: for <'a> FnOnce(&'a Lua) -> Result<Table<'a>>>(Mutex<Option<F>>);
+        struct InnerChunk<'lua, F: FnOnce(&'lua Lua) -> Result<Table<'lua>>>(Cell<Option<F>>, PhantomData<&'lua ()>);
 
-        impl<F> AsChunk<'static> for InnerChunk<F>
+        impl<'lua, F> AsChunk<'lua, 'static> for InnerChunk<'lua, F>
         where
-            F: for <'a> FnOnce(&'a Lua) -> Result<Table<'a>>,
+            F: FnOnce(&'lua Lua) -> Result<Table<'lua>>,
         {
-            fn environment<'lua>(&self, lua: &'lua Lua) -> Result<Option<Table<'lua>>> {
+            fn environment(&self, lua: &'lua Lua) -> Result<Option<Table<'lua>>> {
                 if #caps_len > 0 {
-                    if let Ok(mut make_env) = self.0.lock() {
-                        if let Some(make_env) = make_env.take() {
-                            return make_env(lua).map(Some);
-                        }
+                    if let Some(make_env) = self.0.take() {
+                        return make_env(lua).map(Some);
                     }
                 }
                 Ok(None)
@@ -126,7 +121,7 @@ pub fn chunk(input: TokenStream) -> TokenStream {
             }
         }
 
-        fn annotate<F: for<'a> FnOnce(&'a Lua) -> Result<Table<'a>>>(f: F) -> F { f }
+        fn annotate<'a, F: FnOnce(&'a Lua) -> Result<Table<'a>>>(f: F) -> F { f }
 
         let make_env = annotate(move |lua: &Lua| -> Result<Table> {
             let globals = lua.globals();
@@ -142,13 +137,21 @@ pub fn chunk(input: TokenStream) -> TokenStream {
             Ok(env)
         });
 
-        InnerChunk(Mutex::new(Some(make_env)))
+        InnerChunk(Cell::new(Some(make_env)), PhantomData)
     }};
 
     wrapped_code.into()
 }
 
+#[cfg(feature = "macros")]
+#[proc_macro_derive(FromLua)]
+pub fn from_lua(input: TokenStream) -> TokenStream {
+    from_lua::from_lua(input)
+}
+
 #[cfg(feature = "macros")]
 mod chunk;
 #[cfg(feature = "macros")]
+mod from_lua;
+#[cfg(feature = "macros")]
 mod token;

src/chunk.rs

@@ -15,7 +15,7 @@ use crate::value::{FromLuaMulti, IntoLua, IntoLuaMulti};
 ///
 /// [loadable by Lua]: https://www.lua.org/manual/5.4/manual.html#3.3.2
 /// [`Chunk`]: crate::Chunk
-pub trait AsChunk<'a> {
+pub trait AsChunk<'lua, 'a> {
     /// Returns optional chunk name
     fn name(&self) -> Option<StdString> {
         None
@@ -24,7 +24,7 @@ pub trait AsChunk<'a> {
     /// Returns optional chunk [environment]
     ///
     /// [environment]: https://www.lua.org/manual/5.4/manual.html#2.2
-    fn environment<'lua>(&self, lua: &'lua Lua) -> Result<Option<Table<'lua>>> {
+    fn environment(&self, lua: &'lua Lua) -> Result<Option<Table<'lua>>> {
         let _lua = lua; // suppress warning
         Ok(None)
     }
@@ -38,43 +38,43 @@ pub trait AsChunk<'a> {
     fn source(self) -> IoResult<Cow<'a, [u8]>>;
 }
 
-impl<'a> AsChunk<'a> for &'a str {
+impl<'a> AsChunk<'_, 'a> for &'a str {
     fn source(self) -> IoResult<Cow<'a, [u8]>> {
         Ok(Cow::Borrowed(self.as_ref()))
     }
 }
 
-impl AsChunk<'static> for StdString {
+impl AsChunk<'_, 'static> for StdString {
     fn source(self) -> IoResult<Cow<'static, [u8]>> {
         Ok(Cow::Owned(self.into_bytes()))
     }
 }
 
-impl<'a> AsChunk<'a> for &'a StdString {
+impl<'a> AsChunk<'_, 'a> for &'a StdString {
     fn source(self) -> IoResult<Cow<'a, [u8]>> {
         Ok(Cow::Borrowed(self.as_bytes()))
     }
 }
 
-impl<'a> AsChunk<'a> for &'a [u8] {
+impl<'a> AsChunk<'_, 'a> for &'a [u8] {
     fn source(self) -> IoResult<Cow<'a, [u8]>> {
         Ok(Cow::Borrowed(self))
     }
 }
 
-impl AsChunk<'static> for Vec<u8> {
+impl AsChunk<'_, 'static> for Vec<u8> {
     fn source(self) -> IoResult<Cow<'static, [u8]>> {
         Ok(Cow::Owned(self))
     }
 }
 
-impl<'a> AsChunk<'a> for &'a Vec<u8> {
+impl<'a> AsChunk<'_, 'a> for &'a Vec<u8> {
     fn source(self) -> IoResult<Cow<'a, [u8]>> {
         Ok(Cow::Borrowed(self.as_ref()))
     }
 }
 
-impl AsChunk<'static> for &Path {
+impl AsChunk<'_, 'static> for &Path {
     fn name(&self) -> Option<StdString> {
         Some(format!("@{}", self.display()))
     }
@@ -84,7 +84,7 @@ impl AsChunk<'static> for &Path {
     }
 }
 
-impl AsChunk<'static> for PathBuf {
+impl AsChunk<'_, 'static> for PathBuf {
     fn name(&self) -> Option<StdString> {
         Some(format!("@{}", self.display()))
     }
@@ -125,6 +125,7 @@ pub struct Compiler {
     coverage_level: u8,
     vector_lib: Option<String>,
     vector_ctor: Option<String>,
+    vector_type: Option<String>,
     mutable_globals: Vec<String>,
 }
 
@@ -146,6 +147,7 @@ impl Compiler {
             coverage_level: 0,
             vector_lib: None,
             vector_ctor: None,
+            vector_type: None,
             mutable_globals: Vec::new(),
         }
     }
@@ -188,15 +190,22 @@ impl Compiler {
 
     #[doc(hidden)]
     #[must_use]
-    pub fn set_vector_lib(mut self, lib: Option<String>) -> Self {
-        self.vector_lib = lib;
+    pub fn set_vector_lib(mut self, lib: impl Into<String>) -> Self {
+        self.vector_lib = Some(lib.into());
         self
     }
 
     #[doc(hidden)]
     #[must_use]
-    pub fn set_vector_ctor(mut self, ctor: Option<String>) -> Self {
-        self.vector_ctor = ctor;
+    pub fn set_vector_ctor(mut self, ctor: impl Into<String>) -> Self {
+        self.vector_ctor = Some(ctor.into());
+        self
+    }
+
+    #[doc(hidden)]
+    #[must_use]
+    pub fn set_vector_type(mut self, r#type: impl Into<String>) -> Self {
+        self.vector_type = Some(r#type.into());
         self
     }
 
@@ -220,6 +229,9 @@ impl Compiler {
         let vector_ctor = self.vector_ctor.clone();
         let vector_ctor = vector_ctor.and_then(|ctor| CString::new(ctor).ok());
         let vector_ctor = vector_ctor.as_ref();
+        let vector_type = self.vector_type.clone();
+        let vector_type = vector_type.and_then(|t| CString::new(t).ok());
+        let vector_type = vector_type.as_ref();
 
         let mutable_globals = self
             .mutable_globals
@@ -231,10 +243,10 @@ impl Compiler {
             .iter()
             .map(|s| s.as_ptr())
             .collect::<Vec<_>>();
-        let mut mutable_globals_ptr = ptr::null_mut();
+        let mut mutable_globals_ptr = ptr::null();
         if !mutable_globals.is_empty() {
             mutable_globals.push(ptr::null());
-            mutable_globals_ptr = mutable_globals.as_mut_ptr();
+            mutable_globals_ptr = mutable_globals.as_ptr();
         }
 
         unsafe {
@@ -244,6 +256,7 @@ impl Compiler {
                 coverageLevel: self.coverage_level as c_int,
                 vectorLib: vector_lib.map_or(ptr::null(), |s| s.as_ptr()),
                 vectorCtor: vector_ctor.map_or(ptr::null(), |s| s.as_ptr()),
+                vectorType: vector_type.map_or(ptr::null(), |s| s.as_ptr()),
                 mutableGlobals: mutable_globals_ptr,
             };
             ffi::luau_compile(source.as_ref(), options)

src/conversion.rs

@@ -3,13 +3,15 @@ use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
 use std::convert::TryInto;
 use std::ffi::{CStr, CString};
 use std::hash::{BuildHasher, Hash};
+use std::os::raw::c_int;
 use std::string::String as StdString;
+use std::{slice, str};
 
 use bstr::{BStr, BString};
 use num_traits::cast;
 
 use crate::error::{Error, Result};
-use crate::function::{Function, WrappedFunction};
+use crate::function::Function;
 use crate::lua::Lua;
 use crate::string::String;
 use crate::table::Table;
@@ -21,9 +23,6 @@ use crate::value::{FromLua, IntoLua, Nil, Value};
 #[cfg(all(feature = "unstable", any(not(feature = "send"), doc)))]
 use crate::{function::OwnedFunction, table::OwnedTable, userdata::OwnedAnyUserData};
 
-#[cfg(feature = "async")]
-use crate::function::WrappedAsyncFunction;
-
 impl<'lua> IntoLua<'lua> for Value<'lua> {
     #[inline]
     fn into_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
@@ -136,21 +135,6 @@ impl<'lua> FromLua<'lua> for OwnedFunction {
     }
 }
 
-impl<'lua> IntoLua<'lua> for WrappedFunction<'lua> {
-    #[inline]
-    fn into_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
-        lua.create_callback(self.0).map(Value::Function)
-    }
-}
-
-#[cfg(feature = "async")]
-impl<'lua> IntoLua<'lua> for WrappedAsyncFunction<'lua> {
-    #[inline]
-    fn into_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
-        lua.create_async_callback(self.0).map(Value::Function)
-    }
-}
-
 impl<'lua> IntoLua<'lua> for Thread<'lua> {
     #[inline]
     fn into_lua(self, _: &'lua Lua) -> Result<Value<'lua>> {
@@ -198,7 +182,10 @@ impl<'lua> FromLua<'lua> for AnyUserData<'lua> {
 impl<'lua> IntoLua<'lua> for OwnedAnyUserData {
     #[inline]
     fn into_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
-        Ok(Value::UserData(AnyUserData(lua.adopt_owned_ref(self.0))))
+        Ok(Value::UserData(AnyUserData(
+            lua.adopt_owned_ref(self.0),
+            self.1,
+        )))
     }
 }
 
@@ -320,6 +307,11 @@ impl<'lua> IntoLua<'lua> for StdString {
     fn into_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::String(lua.create_string(&self)?))
     }
+
+    #[inline]
+    unsafe fn push_into_stack(self, lua: &'lua Lua) -> Result<()> {
+        push_bytes_into_stack(self, lua)
+    }
 }
 
 impl<'lua> FromLua<'lua> for StdString {
@@ -336,6 +328,25 @@ impl<'lua> FromLua<'lua> for StdString {
             .to_str()?
             .to_owned())
     }
+
+    #[inline]
+    unsafe fn from_stack(idx: c_int, lua: &'lua Lua) -> Result<Self> {
+        let state = lua.state();
+        if ffi::lua_type(state, idx) == ffi::LUA_TSTRING {
+            let mut size = 0;
+            let data = ffi::lua_tolstring(state, idx, &mut size);
+            let bytes = slice::from_raw_parts(data as *const u8, size);
+            return str::from_utf8(bytes).map(|s| s.to_owned()).map_err(|e| {
+                Error::FromLuaConversionError {
+                    from: "string",
+                    to: "String",
+                    message: Some(e.to_string()),
+                }
+            });
+        }
+        // Fallback to default
+        Self::from_lua(lua.stack_value(idx), lua)
+    }
 }
 
 impl<'lua> IntoLua<'lua> for &str {
@@ -343,6 +354,11 @@ impl<'lua> IntoLua<'lua> for &str {
     fn into_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
         Ok(Value::String(lua.create_string(self)?))
     }
+
+    #[inline]
+    unsafe fn push_into_stack(self, lua: &'lua Lua) -> Result<()> {
+        push_bytes_into_stack(self, lua)
+    }
 }
 
 impl<'lua> IntoLua<'lua> for Cow<'_, str> {
@@ -451,6 +467,21 @@ impl<'lua> IntoLua<'lua> for &BStr {
     }
 }
 
+#[inline]
+unsafe fn push_bytes_into_stack<'lua, T>(this: T, lua: &'lua Lua) -> Result<()>
+where
+    T: IntoLua<'lua> + AsRef<[u8]>,
+{
+    let bytes = this.as_ref();
+    if lua.unlikely_memory_error() && bytes.len() < (1 << 30) {
+        // Fast path: push directly into the Lua stack.
+        ffi::lua_pushlstring(lua.state(), bytes.as_ptr() as *const _, bytes.len());
+        return Ok(());
+    }
+    // Fallback to default
+    lua.push_value(T::into_lua(this, lua)?)
+}
+
 macro_rules! lua_convert_int {
     ($x:ty) => {
         impl<'lua> IntoLua<'lua> for $x {

src/function.rs

@@ -13,7 +13,7 @@ use crate::util::{
     assert_stack, check_stack, error_traceback, linenumber_to_usize, pop_error, ptr_to_lossy_str,
     ptr_to_str, StackGuard,
 };
-use crate::value::{FromLuaMulti, IntoLua, IntoLuaMulti};
+use crate::value::{FromLuaMulti, IntoLua, IntoLuaMulti, Value};
 
 #[cfg(feature = "async")]
 use {
@@ -126,34 +126,25 @@ impl<'lua> Function<'lua> {
     pub fn call<A: IntoLuaMulti<'lua>, R: FromLuaMulti<'lua>>(&self, args: A) -> Result<R> {
         let lua = self.0.lua;
         let state = lua.state();
-
-        let mut args = args.into_lua_multi(lua)?;
-        let nargs = args.len() as c_int;
-
-        let results = unsafe {
+        unsafe {
             let _sg = StackGuard::new(state);
-            check_stack(state, nargs + 3)?;
+            check_stack(state, 2)?;
 
+            // Push error handler
             MemoryState::relax_limit_with(state, || ffi::lua_pushcfunction(state, error_traceback));
             let stack_start = ffi::lua_gettop(state);
+            // Push function and the arguments
             lua.push_ref(&self.0);
-            for arg in args.drain_all() {
-                lua.push_value(arg)?;
-            }
+            let nargs = args.push_into_stack_multi(lua)?;
+            // Call the function
             let ret = ffi::lua_pcall(state, nargs, ffi::LUA_MULTRET, stack_start);
             if ret != ffi::LUA_OK {
                 return Err(pop_error(state, ret));
             }
+            // Get the results
             let nresults = ffi::lua_gettop(state) - stack_start;
-            let mut results = args; // Reuse MultiValue container
-            assert_stack(state, 2);
-            for _ in 0..nresults {
-                results.push_front(lua.pop_value());
-            }
-            ffi::lua_pop(state, 1);
-            results
-        };
-        R::from_lua_multi(results, lua)
+            R::from_stack_multi(nresults, lua)
+        }
     }
 
     /// Returns a future that, when polled, calls `self`, passing `args` as function arguments,
@@ -228,7 +219,7 @@ impl<'lua> Function<'lua> {
     /// # }
     /// ```
     pub fn bind<A: IntoLuaMulti<'lua>>(&self, args: A) -> Result<Function<'lua>> {
-        unsafe extern "C" fn args_wrapper_impl(state: *mut ffi::lua_State) -> c_int {
+        unsafe extern "C-unwind" fn args_wrapper_impl(state: *mut ffi::lua_State) -> c_int {
             let nargs = ffi::lua_gettop(state);
             let nbinds = ffi::lua_tointeger(state, ffi::lua_upvalueindex(1)) as c_int;
             ffi::luaL_checkstack(state, nbinds, ptr::null());
@@ -423,7 +414,7 @@ impl<'lua> Function<'lua> {
     #[cfg(not(feature = "luau"))]
     #[cfg_attr(docsrs, doc(cfg(not(feature = "luau"))))]
     pub fn dump(&self, strip: bool) -> Vec<u8> {
-        unsafe extern "C" fn writer(
+        unsafe extern "C-unwind" fn writer(
             _state: *mut ffi::lua_State,
             buf: *const c_void,
             buf_len: usize,
@@ -470,7 +461,7 @@ impl<'lua> Function<'lua> {
         use std::ffi::CStr;
         use std::os::raw::c_char;
 
-        unsafe extern "C" fn callback<F: FnMut(CoverageInfo)>(
+        unsafe extern "C-unwind" fn callback<F: FnMut(CoverageInfo)>(
             data: *mut c_void,
             function: *const c_char,
             line_defined: c_int,
@@ -564,8 +555,9 @@ impl<'lua> Function<'lua> {
         R: IntoLuaMulti<'lua>,
         F: Fn(&'lua Lua, A) -> Result<R> + MaybeSend + 'static,
     {
-        WrappedFunction(Box::new(move |lua, args| {
-            func(lua, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
+        WrappedFunction(Box::new(move |lua, nargs| unsafe {
+            let args = A::from_stack_args(nargs, 1, None, lua)?;
+            func(lua, args)?.push_into_stack_multi(lua)
         }))
     }
 
@@ -578,11 +570,12 @@ impl<'lua> Function<'lua> {
         F: FnMut(&'lua Lua, A) -> Result<R> + MaybeSend + 'static,
     {
         let func = RefCell::new(func);
-        WrappedFunction(Box::new(move |lua, args| {
+        WrappedFunction(Box::new(move |lua, nargs| unsafe {
             let mut func = func
                 .try_borrow_mut()
                 .map_err(|_| Error::RecursiveMutCallback)?;
-            func(lua, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
+            let args = A::from_stack_args(nargs, 1, None, lua)?;
+            func(lua, args)?.push_into_stack_multi(lua)
         }))
     }
 
@@ -596,17 +589,32 @@ impl<'lua> Function<'lua> {
         F: Fn(&'lua Lua, A) -> FR + MaybeSend + 'static,
         FR: Future<Output = Result<R>> + 'lua,
     {
-        WrappedAsyncFunction(Box::new(move |lua, args| {
-            let args = match A::from_lua_multi(args, lua) {
+        WrappedAsyncFunction(Box::new(move |lua, args| unsafe {
+            let args = match A::from_lua_args(args, 1, None, lua) {
                 Ok(args) => args,
                 Err(e) => return Box::pin(future::err(e)),
             };
             let fut = func(lua, args);
-            Box::pin(async move { fut.await?.into_lua_multi(lua) })
+            Box::pin(async move { fut.await?.push_into_stack_multi(lua) })
         }))
     }
 }
 
+impl<'lua> IntoLua<'lua> for WrappedFunction<'lua> {
+    #[inline]
+    fn into_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
+        lua.create_callback(self.0).map(Value::Function)
+    }
+}
+
+#[cfg(feature = "async")]
+impl<'lua> IntoLua<'lua> for WrappedAsyncFunction<'lua> {
+    #[inline]
+    fn into_lua(self, lua: &'lua Lua) -> Result<Value<'lua>> {
+        lua.create_async_callback(self.0).map(Value::Function)
+    }
+}
+
 #[cfg(test)]
 mod assertions {
     use super::*;

src/hook.rs

@@ -353,8 +353,10 @@ impl HookTriggers {
     // Returns the `count` parameter to pass to `lua_sethook`, if applicable. Otherwise, zero is
     // returned.
     pub(crate) const fn count(&self) -> c_int {
-        let Some(n) = self.every_nth_instruction else { return 0 };
-        n as c_int
+        match self.every_nth_instruction {
+            Some(n) => n as c_int,
+            None => 0,
+        }
     }
 }
 

src/lib.rs

@@ -157,7 +157,8 @@ extern crate mlua_derive;
 // Unstable features
 #[cfg(feature = "unstable")]
 pub use crate::{
-    function::OwnedFunction, string::OwnedString, table::OwnedTable, userdata::OwnedAnyUserData,
+    function::OwnedFunction, string::OwnedString, table::OwnedTable, thread::OwnedThread,
+    userdata::OwnedAnyUserData,
 };
 
 /// Create a type that implements [`AsChunk`] and can capture Rust variables.
@@ -216,6 +217,14 @@ pub use crate::{
 #[cfg_attr(docsrs, doc(cfg(feature = "macros")))]
 pub use mlua_derive::chunk;
 
+/// Derive [`FromLua`] for a Rust type.
+///
+/// Current implementation generate code that takes [`UserData`] value, borrow it (of the Rust type)
+/// and clone.
+#[cfg(feature = "macros")]
+#[cfg_attr(docsrs, doc(cfg(feature = "macros")))]
+pub use mlua_derive::FromLua;
+
 /// Registers Lua module entrypoint.
 ///
 /// You can register multiple entrypoints as required.
@@ -248,7 +257,7 @@ pub use mlua_derive::chunk;
 ///
 /// In module mode, mlua runs in unknown environment and cannot say are there any memory
 /// limits or not. As result, some operations that require memory allocation runs in
-/// protected mode. Setting this mode will improve performance of such operations
+/// protected mode. Setting this attribute will improve performance of such operations
 /// with risk of having uncaught exceptions and memory leaks.
 ///
 /// ```ignore

src/lua.rs

@@ -3,15 +3,14 @@ use std::cell::{RefCell, UnsafeCell};
 use std::ffi::{CStr, CString};
 use std::fmt;
 use std::marker::PhantomData;
-use std::mem::MaybeUninit;
+use std::mem::{self, MaybeUninit};
 use std::ops::Deref;
 use std::os::raw::{c_char, c_int, c_void};
 use std::panic::{catch_unwind, resume_unwind, AssertUnwindSafe, Location};
-use std::ptr::NonNull;
+use std::ptr;
 use std::result::Result as StdResult;
 use std::sync::atomic::{AtomicPtr, Ordering};
 use std::sync::{Arc, Mutex};
-use std::{mem, ptr, str};
 
 use rustc_hash::FxHashMap;
 
@@ -27,7 +26,7 @@ use crate::table::Table;
 use crate::thread::Thread;
 use crate::types::{
     AppData, AppDataRef, AppDataRefMut, Callback, CallbackUpvalue, DestructedUserdata, Integer,
-    LightUserData, LuaRef, MaybeSend, Number, RegistryKey,
+    LightUserData, LuaRef, MaybeSend, Number, RegistryKey, SubtypeId,
 };
 use crate::userdata::{AnyUserData, MetaMethod, UserData, UserDataCell};
 use crate::userdata_impl::{UserDataProxy, UserDataRegistry};
@@ -60,6 +59,7 @@ use {
     crate::types::{AsyncCallback, AsyncCallbackUpvalue, AsyncPollUpvalue},
     futures_util::future::{self, Future},
     futures_util::task::{noop_waker_ref, Context, Poll, Waker},
+    std::ptr::NonNull,
 };
 
 #[cfg(feature = "serialize")]
@@ -94,7 +94,6 @@ pub(crate) struct ExtraData {
 
     safe: bool,
     libs: StdLib,
-    mem_state: Option<NonNull<MemoryState>>,
     #[cfg(feature = "module")]
     skip_memory_check: bool,
 
@@ -107,7 +106,7 @@ pub(crate) struct ExtraData {
     // Pool of `WrappedFailure` enums in the ref thread (as userdata)
     wrapped_failure_pool: Vec<c_int>,
     // Pool of `MultiValue` containers
-    multivalue_pool: Vec<MultiValue<'static>>,
+    multivalue_pool: Vec<Vec<Value<'static>>>,
     // Pool of `Thread`s (coroutines) for async execution
     #[cfg(feature = "async")]
     thread_pool: Vec<c_int>,
@@ -173,7 +172,7 @@ pub struct LuaOptions {
 
     /// Max size of thread (coroutine) object pool used to execute asynchronous functions.
     ///
-    /// It works on Lua 5.4, LuaJIT (vendored) and Luau, where [`lua_resetthread`] function
+    /// It works on Lua 5.4 and Luau, where [`lua_resetthread`] function
     /// is available and allows to reuse old coroutines after resetting their state.
     ///
     /// Default: **0** (disabled)
@@ -244,11 +243,14 @@ impl Drop for Lua {
 impl Drop for LuaInner {
     fn drop(&mut self) {
         unsafe {
-            #[cfg(feature = "luau")]
-            {
-                (*ffi::lua_callbacks(self.state())).userdata = ptr::null_mut();
-            }
+            let mem_state = MemoryState::get(self.main_state);
+
             ffi::lua_close(self.main_state);
+
+            // Deallocate MemoryState
+            if !mem_state.is_null() {
+                drop(Box::from_raw(mem_state));
+            }
         }
     }
 }
@@ -261,9 +263,6 @@ impl Drop for ExtraData {
         }
 
         *mlua_expect!(self.registry_unref_list.lock(), "unref list poisoned") = None;
-        if let Some(mem_state) = self.mem_state {
-            drop(unsafe { Box::from_raw(mem_state.as_ptr()) });
-        }
     }
 }
 
@@ -282,6 +281,13 @@ impl Deref for Lua {
     }
 }
 
+impl Default for Lua {
+    #[inline]
+    fn default() -> Self {
+        Lua::new()
+    }
+}
+
 impl Lua {
     /// Creates a new Lua state and loads the **safe** subset of the standard libraries.
     ///
@@ -292,7 +298,6 @@ impl Lua {
     /// See [`StdLib`] documentation for a list of unsafe modules that cannot be loaded.
     ///
     /// [`StdLib`]: crate::StdLib
-    #[allow(clippy::new_without_default)]
     pub fn new() -> Lua {
         mlua_expect!(
             Self::new_with(StdLib::ALL_SAFE, LuaOptions::default()),
@@ -335,7 +340,6 @@ impl Lua {
 
         let lua = unsafe { Self::inner_new(libs, options) };
 
-        #[cfg(not(feature = "luau"))]
         if libs.contains(StdLib::PACKAGE) {
             mlua_expect!(lua.disable_c_modules(), "Error during disabling C modules");
         }
@@ -353,23 +357,22 @@ impl Lua {
     ///
     /// [`StdLib`]: crate::StdLib
     pub unsafe fn unsafe_new_with(libs: StdLib, options: LuaOptions) -> Lua {
+        // Workaround to avoid stripping a few unused Lua symbols that could be imported
+        // by C modules in unsafe mode
+        let mut _symbols: Vec<*const extern "C-unwind" fn()> =
+            vec![ffi::lua_isuserdata as _, ffi::lua_tocfunction as _];
+
         #[cfg(not(feature = "luau"))]
+        _symbols.extend_from_slice(&[
+            ffi::lua_atpanic as _,
+            ffi::luaL_loadstring as _,
+            ffi::luaL_openlibs as _,
+        ]);
+        #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
         {
-            // Workaround to avoid stripping a few unused Lua symbols that could be imported
-            // by C modules in unsafe mode
-            let mut _symbols: Vec<*const extern "C" fn()> = vec![
-                ffi::lua_atpanic as _,
-                ffi::lua_isuserdata as _,
-                ffi::lua_tocfunction as _,
-                ffi::luaL_loadstring as _,
-                ffi::luaL_openlibs as _,
-            ];
-            #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
-            {
-                _symbols.push(ffi::lua_getglobal as _);
-                _symbols.push(ffi::lua_setglobal as _);
-                _symbols.push(ffi::luaL_setfuncs as _);
-            }
+            _symbols.push(ffi::lua_getglobal as _);
+            _symbols.push(ffi::lua_setglobal as _);
+            _symbols.push(ffi::luaL_setfuncs as _);
         }
 
         Self::inner_new(libs, options)
@@ -377,22 +380,13 @@ impl Lua {
 
     /// Creates a new Lua state with required `libs` and `options`
     unsafe fn inner_new(libs: StdLib, options: LuaOptions) -> Lua {
-        // Skip Rust allocator for non-vendored LuaJIT (see https://github.com/khvzak/mlua/issues/176)
-        let use_rust_allocator = !(cfg!(feature = "luajit") && cfg!(not(feature = "vendored")));
-
-        let (state, mem_state) = if use_rust_allocator {
-            let mut mem_state: *mut MemoryState = Box::into_raw(Box::default());
-            let mut state = ffi::lua_newstate(ALLOCATOR, mem_state as *mut c_void);
-            // If state is null (it's possible for LuaJIT on non-x86 arch) then switch to Lua internal allocator
-            if state.is_null() {
-                drop(Box::from_raw(mem_state));
-                mem_state = ptr::null_mut();
-                state = ffi::luaL_newstate();
-            }
-            (state, mem_state)
-        } else {
-            (ffi::luaL_newstate(), ptr::null_mut())
-        };
+        let mem_state: *mut MemoryState = Box::into_raw(Box::default());
+        let mut state = ffi::lua_newstate(ALLOCATOR, mem_state as *mut c_void);
+        // If state is null then switch to Lua internal allocator
+        if state.is_null() {
+            drop(Box::from_raw(mem_state));
+            state = ffi::luaL_newstate();
+        }
         assert!(!state.is_null(), "Failed to instantiate Lua VM");
 
         ffi::luaL_requiref(state, cstr!("_G"), ffi::luaopen_base, 1);
@@ -406,7 +400,6 @@ impl Lua {
 
         let lua = Lua::init_from_ptr(state);
         let extra = lua.extra.get();
-        (*extra).mem_state = NonNull::new(mem_state);
 
         mlua_expect!(
             load_from_std_lib(state, libs),
@@ -442,7 +435,7 @@ impl Lua {
         }
 
         #[cfg(feature = "luau")]
-        mlua_expect!(lua.prepare_luau_state(), "Error preparing Luau state");
+        mlua_expect!(lua.configure_luau(), "Error configuring Luau");
 
         lua
     }
@@ -516,7 +509,6 @@ impl Lua {
             app_data: AppData::default(),
             safe: false,
             libs: StdLib::NONE,
-            mem_state: None,
             #[cfg(feature = "module")]
             skip_memory_check: false,
             ref_thread,
@@ -549,14 +541,8 @@ impl Lua {
 
         // Store it in the registry
         mlua_expect!(
-            (|state| {
-                push_gc_userdata(state, Arc::clone(&extra), true)?;
-                protect_lua!(state, 1, 0, fn(state) {
-                    let extra_key = &EXTRA_REGISTRY_KEY as *const u8 as *const c_void;
-                    ffi::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, extra_key);
-                })
-            })(main_state),
-            "Error while storing extra data",
+            set_extra_data(main_state, &extra),
+            "Error while storing extra data"
         );
 
         // Register `DestructedUserdata` type
@@ -574,13 +560,6 @@ impl Lua {
         );
         assert_stack(main_state, ffi::LUA_MINSTACK);
 
-        // Set Luau callbacks userdata to extra data
-        // We can use global callbacks userdata since we don't allow C modules in Luau
-        #[cfg(feature = "luau")]
-        {
-            (*ffi::lua_callbacks(main_state)).userdata = extra.get() as *mut c_void;
-        }
-
         let inner = Arc::new(LuaInner {
             state: AtomicPtr::new(state),
             main_state,
@@ -600,7 +579,6 @@ impl Lua {
     ///
     /// [`StdLib`]: crate::StdLib
     pub fn load_from_std_lib(&self, libs: StdLib) -> Result<()> {
-        #[cfg(not(feature = "luau"))]
         let is_safe = unsafe { (*self.extra.get()).safe };
 
         #[cfg(not(feature = "luau"))]
@@ -619,12 +597,9 @@ impl Lua {
         let res = unsafe { load_from_std_lib(self.main_state, libs) };
 
         // If `package` library loaded into a safe lua state then disable C modules
-        #[cfg(not(feature = "luau"))]
-        {
-            let curr_libs = unsafe { (*self.extra.get()).libs };
-            if is_safe && (curr_libs ^ (curr_libs | libs)).contains(StdLib::PACKAGE) {
-                mlua_expect!(self.disable_c_modules(), "Error during disabling C modules");
-            }
+        let curr_libs = unsafe { (*self.extra.get()).libs };
+        if is_safe && (curr_libs ^ (curr_libs | libs)).contains(StdLib::PACKAGE) {
+            mlua_expect!(self.disable_c_modules(), "Error during disabling C modules");
         }
         unsafe { (*self.extra.get()).libs |= libs };
 
@@ -726,50 +701,28 @@ impl Lua {
     // The returned value then pushed onto the stack.
     #[doc(hidden)]
     #[cfg(not(tarpaulin_include))]
-    pub unsafe fn entrypoint<'lua, A, R, F>(self, func: F) -> Result<c_int>
+    pub unsafe fn entrypoint<'lua, A, R, F>(self, func: F) -> c_int
     where
         A: FromLuaMulti<'lua>,
         R: IntoLua<'lua>,
         F: Fn(&'lua Lua, A) -> Result<R> + MaybeSend + 'static,
     {
-        let entrypoint_inner = |lua: &'lua Lua, func: F| {
-            let state = lua.state();
-            let nargs = ffi::lua_gettop(state);
-            check_stack(state, 3)?;
+        let (state, extra) = (self.state(), self.extra.get());
+        // It must be safe to drop `self` as in the module mode we keep strong reference to `Lua` in the registry
+        drop(self);
 
-            let mut args = MultiValue::new();
-            args.reserve(nargs as usize);
-            for _ in 0..nargs {
-                args.push_front(lua.pop_value());
-            }
-
-            // We create callback rather than call `func` directly to catch errors
-            // with attached stacktrace.
-            let callback = lua.create_callback(Box::new(move |lua, args| {
-                func(lua, A::from_lua_multi_args(args, 1, None, lua)?)?.into_lua_multi(lua)
-            }))?;
-            callback.call(args)
-        };
-
-        match entrypoint_inner(mem::transmute(&self), func) {
-            Ok(res) => {
-                self.push_value(res)?;
-                Ok(1)
-            }
-            Err(err) => {
-                self.push_value(Value::Error(err))?;
-                let state = self.state();
-                // Lua (self) must be dropped before triggering longjmp
-                drop(self);
-                ffi::lua_error(state)
-            }
-        }
+        callback_error_ext(state, extra, move |nargs| {
+            let lua: &Lua = mem::transmute((*extra).inner.assume_init_ref());
+            let args = A::from_stack_args(nargs, 1, None, lua)?;
+            func(lua, args)?.push_into_stack(lua)?;
+            Ok(1)
+        })
     }
 
     // A simple module entrypoint without arguments
     #[doc(hidden)]
     #[cfg(not(tarpaulin_include))]
-    pub unsafe fn entrypoint1<'lua, R, F>(self, func: F) -> Result<c_int>
+    pub unsafe fn entrypoint1<'lua, R, F>(self, func: F) -> c_int
     where
         R: IntoLua<'lua>,
         F: Fn(&'lua Lua) -> Result<R> + MaybeSend + 'static,
@@ -893,7 +846,7 @@ impl Lua {
     ) where
         F: Fn(&Lua, Debug) -> Result<()> + MaybeSend + 'static,
     {
-        unsafe extern "C" fn hook_proc(state: *mut ffi::lua_State, ar: *mut ffi::lua_Debug) {
+        unsafe extern "C-unwind" fn hook_proc(state: *mut ffi::lua_State, ar: *mut ffi::lua_Debug) {
             let extra = extra_data(state);
             if (*extra).hook_thread != state {
                 // Hook was destined for a different thread, ignore
@@ -987,7 +940,7 @@ impl Lua {
     where
         F: Fn(&Lua) -> Result<VmState> + MaybeSend + 'static,
     {
-        unsafe extern "C" fn interrupt_proc(state: *mut ffi::lua_State, gc: c_int) {
+        unsafe extern "C-unwind" fn interrupt_proc(state: *mut ffi::lua_State, gc: c_int) {
             if gc >= 0 {
                 // We don't support GC interrupts since they cannot survive Lua exceptions
                 return;
@@ -1039,7 +992,7 @@ impl Lua {
     where
         F: Fn(&Lua, &str, bool) -> Result<()> + MaybeSend + 'static,
     {
-        unsafe extern "C" fn warn_proc(ud: *mut c_void, msg: *const c_char, tocont: c_int) {
+        unsafe extern "C-unwind" fn warn_proc(ud: *mut c_void, msg: *const c_char, tocont: c_int) {
             let extra = ud as *mut ExtraData;
             let lua: &Lua = mem::transmute((*extra).inner.assume_init_ref());
             callback_error_ext(lua.state(), extra, |_| {
@@ -1122,9 +1075,9 @@ impl Lua {
     /// Returns the amount of memory (in bytes) currently used inside this Lua state.
     pub fn used_memory(&self) -> usize {
         unsafe {
-            match (*self.extra.get()).mem_state.map(|x| x.as_ref()) {
-                Some(mem_state) => mem_state.used_memory(),
-                None => {
+            match MemoryState::get(self.main_state) {
+                mem_state if !mem_state.is_null() => (*mem_state).used_memory(),
+                _ => {
                     // Get data from the Lua GC
                     let used_kbytes = ffi::lua_gc(self.main_state, ffi::LUA_GCCOUNT, 0);
                     let used_kbytes_rem = ffi::lua_gc(self.main_state, ffi::LUA_GCCOUNTB, 0);
@@ -1143,9 +1096,9 @@ impl Lua {
     /// Does not work in module mode where Lua state is managed externally.
     pub fn set_memory_limit(&self, limit: usize) -> Result<usize> {
         unsafe {
-            match (*self.extra.get()).mem_state.map(|mut x| x.as_mut()) {
-                Some(mem_state) => Ok(mem_state.set_memory_limit(limit)),
-                None => Err(Error::MemoryLimitNotAvailable),
+            match MemoryState::get(self.main_state) {
+                mem_state if !mem_state.is_null() => Ok((*mem_state).set_memory_limit(limit)),
+                _ => Err(Error::MemoryLimitNotAvailable),
             }
         }
     }
@@ -1333,7 +1286,7 @@ impl Lua {
     ///
     /// [`Chunk::exec`]: crate::Chunk::exec
     #[track_caller]
-    pub fn load<'lua, 'a>(&'lua self, chunk: impl AsChunk<'a>) -> Chunk<'lua, 'a> {
+    pub fn load<'lua, 'a>(&'lua self, chunk: impl AsChunk<'lua, 'a>) -> Chunk<'lua, 'a> {
         let caller = Location::caller();
         Chunk {
             lua: self,
@@ -1545,8 +1498,9 @@ impl Lua {
         R: IntoLuaMulti<'lua>,
         F: Fn(&'lua Lua, A) -> Result<R> + MaybeSend + 'static,
     {
-        self.create_callback(Box::new(move |lua, args| {
-            func(lua, A::from_lua_multi_args(args, 1, None, lua)?)?.into_lua_multi(lua)
+        self.create_callback(Box::new(move |lua, nargs| unsafe {
+            let args = A::from_stack_args(nargs, 1, None, lua)?;
+            func(lua, args)?.push_into_stack_multi(lua)
         }))
     }
 
@@ -1629,13 +1583,13 @@ impl Lua {
         F: Fn(&'lua Lua, A) -> FR + MaybeSend + 'static,
         FR: Future<Output = Result<R>> + 'lua,
     {
-        self.create_async_callback(Box::new(move |lua, args| {
-            let args = match A::from_lua_multi_args(args, 1, None, lua) {
+        self.create_async_callback(Box::new(move |lua, args| unsafe {
+            let args = match A::from_lua_args(args, 1, None, lua) {
                 Ok(args) => args,
                 Err(e) => return Box::pin(future::err(e)),
             };
             let fut = func(lua, args);
-            Box::pin(async move { fut.await?.into_lua_multi(lua) })
+            Box::pin(async move { fut.await?.push_into_stack_multi(lua) })
         }))
     }
 
@@ -1663,7 +1617,7 @@ impl Lua {
             self.push_ref(&func.0);
             ffi::lua_xmove(state, thread_state, 1);
 
-            Ok(Thread(self.pop_ref()))
+            Ok(Thread::new(self.pop_ref()))
         }
     }
 
@@ -1673,11 +1627,7 @@ impl Lua {
         &'lua self,
         func: &Function,
     ) -> Result<Thread<'lua>> {
-        #[cfg(any(
-            feature = "lua54",
-            all(feature = "luajit", feature = "vendored"),
-            feature = "luau",
-        ))]
+        #[cfg(any(feature = "lua54", feature = "luau"))]
         unsafe {
             let state = self.state();
             let _sg = StackGuard::new(state);
@@ -1695,7 +1645,7 @@ impl Lua {
                     ffi::lua_replace(thread_state, ffi::LUA_GLOBALSINDEX);
                 }
 
-                return Ok(Thread(LuaRef::new(self, index)));
+                return Ok(Thread::new(LuaRef::new(self, index)));
             }
         };
         self.create_thread_inner(func)
@@ -1703,11 +1653,7 @@ impl Lua {
 
     /// Resets thread (coroutine) and returns to the pool for later use.
     #[cfg(feature = "async")]
-    #[cfg(any(
-        feature = "lua54",
-        all(feature = "luajit", feature = "vendored"),
-        feature = "luau",
-    ))]
+    #[cfg(any(feature = "lua54", feature = "luau"))]
     pub(crate) unsafe fn recycle_thread(&self, thread: &mut Thread) -> bool {
         let extra = &mut *self.extra.get();
         if extra.thread_pool.len() < extra.thread_pool.capacity() {
@@ -1721,8 +1667,6 @@ impl Lua {
                 // Error object is on top, drop it
                 ffi::lua_settop(thread_state, 0);
             }
-            #[cfg(all(feature = "luajit", feature = "vendored"))]
-            ffi::lua_resetthread(self.state(), thread_state);
             #[cfg(feature = "luau")]
             ffi::lua_resetthread(thread_state);
             extra.thread_pool.push(thread.0.index);
@@ -1834,6 +1778,27 @@ impl Lua {
         unsafe { self.make_userdata(UserDataCell::new(UserDataProxy::<T>(PhantomData))) }
     }
 
+    /// Sets the metatable for a Luau builtin vector type.
+    #[cfg(any(all(feature = "luau", feature = "unstable"), doc))]
+    #[cfg_attr(docsrs, doc(cfg(all(feature = "luau", feature = "unstable"))))]
+    pub fn set_vector_metatable(&self, metatable: Option<Table>) {
+        unsafe {
+            let state = self.state();
+            let _sg = StackGuard::new(state);
+            assert_stack(state, 2);
+
+            #[cfg(not(feature = "luau-vector4"))]
+            ffi::lua_pushvector(state, 0., 0., 0.);
+            #[cfg(feature = "luau-vector4")]
+            ffi::lua_pushvector(state, 0., 0., 0., 0.);
+            match metatable {
+                Some(metatable) => self.push_ref(&metatable.0),
+                None => ffi::lua_pushnil(state),
+            };
+            ffi::lua_setmetatable(state, -2);
+        }
+    }
+
     /// Returns a handle to the global environment.
     pub fn globals(&self) -> Table {
         let state = self.state();
@@ -1856,7 +1821,7 @@ impl Lua {
             let _sg = StackGuard::new(state);
             assert_stack(state, 1);
             ffi::lua_pushthread(state);
-            Thread(self.pop_ref())
+            Thread::new(self.pop_ref())
         }
     }
 
@@ -2447,17 +2412,128 @@ impl Lua {
                         ffi::lua_pop(state, 1);
                         Nil
                     }
-                    _ => Value::UserData(AnyUserData(self.pop_ref())),
+                    _ => Value::UserData(AnyUserData(self.pop_ref(), SubtypeId::None)),
                 }
             }
 
-            ffi::LUA_TTHREAD => Value::Thread(Thread(self.pop_ref())),
+            ffi::LUA_TTHREAD => Value::Thread(Thread::new(self.pop_ref())),
+
+            #[cfg(feature = "luau")]
+            ffi::LUA_TBUFFER => {
+                // Buffer is represented as a userdata type
+                Value::UserData(AnyUserData(self.pop_ref(), SubtypeId::Buffer))
+            }
 
             #[cfg(feature = "luajit")]
             ffi::LUA_TCDATA => {
-                ffi::lua_pop(state, 1);
-                // TODO: Fix this in a next major release
-                panic!("cdata objects cannot be handled by mlua yet");
+                // CDATA is represented as a userdata type
+                Value::UserData(AnyUserData(self.pop_ref(), SubtypeId::CData))
+            }
+
+            _ => mlua_panic!("LUA_TNONE in pop_value"),
+        }
+    }
+
+    /// Returns value at given stack index without popping it.
+    ///
+    /// Uses 2 stack spaces, does not call checkstack.
+    pub(crate) unsafe fn stack_value(&self, idx: c_int) -> Value {
+        let state = self.state();
+        match ffi::lua_type(state, idx) {
+            ffi::LUA_TNIL => Nil,
+
+            ffi::LUA_TBOOLEAN => Value::Boolean(ffi::lua_toboolean(state, idx) != 0),
+
+            ffi::LUA_TLIGHTUSERDATA => {
+                Value::LightUserData(LightUserData(ffi::lua_touserdata(state, idx)))
+            }
+
+            #[cfg(any(feature = "lua54", feature = "lua53"))]
+            ffi::LUA_TNUMBER => {
+                if ffi::lua_isinteger(state, idx) != 0 {
+                    Value::Integer(ffi::lua_tointeger(state, idx))
+                } else {
+                    Value::Number(ffi::lua_tonumber(state, idx))
+                }
+            }
+
+            #[cfg(any(
+                feature = "lua52",
+                feature = "lua51",
+                feature = "luajit",
+                feature = "luau"
+            ))]
+            ffi::LUA_TNUMBER => {
+                let n = ffi::lua_tonumber(state, idx);
+                match num_traits::cast(n) {
+                    Some(i) if (n - (i as Number)).abs() < Number::EPSILON => Value::Integer(i),
+                    _ => Value::Number(n),
+                }
+            }
+
+            #[cfg(feature = "luau")]
+            ffi::LUA_TVECTOR => {
+                let v = ffi::lua_tovector(state, idx);
+                mlua_debug_assert!(!v.is_null(), "vector is null");
+                #[cfg(not(feature = "luau-vector4"))]
+                return Value::Vector(Vector([*v, *v.add(1), *v.add(2)]));
+                #[cfg(feature = "luau-vector4")]
+                return Value::Vector(Vector([*v, *v.add(1), *v.add(2), *v.add(3)]));
+            }
+
+            ffi::LUA_TSTRING => {
+                ffi::lua_xpush(state, self.ref_thread(), idx);
+                Value::String(String(self.pop_ref_thread()))
+            }
+
+            ffi::LUA_TTABLE => {
+                ffi::lua_xpush(state, self.ref_thread(), idx);
+                Value::Table(Table(self.pop_ref_thread()))
+            }
+
+            ffi::LUA_TFUNCTION => {
+                ffi::lua_xpush(state, self.ref_thread(), idx);
+                Value::Function(Function(self.pop_ref_thread()))
+            }
+
+            ffi::LUA_TUSERDATA => {
+                let wrapped_failure_mt_ptr = (*self.extra.get()).wrapped_failure_mt_ptr;
+                // We must prevent interaction with userdata types other than UserData OR a WrappedError.
+                // WrappedPanics are automatically resumed.
+                match get_gc_userdata::<WrappedFailure>(state, idx, wrapped_failure_mt_ptr).as_mut()
+                {
+                    Some(WrappedFailure::Error(err)) => Value::Error(err.clone()),
+                    Some(WrappedFailure::Panic(panic)) => {
+                        if let Some(panic) = panic.take() {
+                            resume_unwind(panic);
+                        }
+                        // Previously resumed panic?
+                        Value::Nil
+                    }
+                    _ => {
+                        ffi::lua_xpush(state, self.ref_thread(), idx);
+                        Value::UserData(AnyUserData(self.pop_ref_thread(), SubtypeId::None))
+                    }
+                }
+            }
+
+            ffi::LUA_TTHREAD => {
+                ffi::lua_xpush(state, self.ref_thread(), idx);
+                Value::Thread(Thread::new(self.pop_ref_thread()))
+            }
+
+            #[cfg(feature = "luau")]
+            ffi::LUA_TBUFFER => {
+                // Buffer is represented as a userdata type
+                ffi::lua_xpush(state, self.ref_thread(), idx);
+                Value::UserData(AnyUserData(self.pop_ref_thread(), SubtypeId::Buffer))
+            }
+
+            #[cfg(feature = "luajit")]
+            ffi::LUA_TCDATA => {
+                // CData is represented as a userdata type
+                ffi::lua_xpush(state, self.ref_thread(), idx);
+                Value::UserData(AnyUserData(self.pop_ref_thread(), SubtypeId::CData))
             }
 
             _ => mlua_panic!("LUA_TNONE in pop_value"),
@@ -2549,15 +2625,15 @@ impl Lua {
         }
         let mut has_name = false;
         for (k, f) in registry.meta_fields {
-            has_name = has_name || k == "__name";
-            self.push_value(f(self, MultiValue::new())?.pop_front().unwrap())?;
+            has_name = has_name || k == MetaMethod::Type;
+            mlua_assert!(f(self, 0)? == 1, "field function must return one value");
             rawset_field(state, -2, MetaMethod::validate(&k)?)?;
         }
-        // Set `__name` if not provided
+        // Set `__name/__type` if not provided
         if !has_name {
             let type_name = short_type_name::<T>();
             push_string(state, type_name.as_bytes(), !self.unlikely_memory_error())?;
-            rawset_field(state, -2, "__name")?;
+            rawset_field(state, -2, MetaMethod::Type.name())?;
         }
         let metatable_index = ffi::lua_absindex(state, -1);
 
@@ -2575,12 +2651,13 @@ impl Lua {
                         push_table(state, 0, fields_nrec, true)?;
                     }
                     for (k, f) in registry.fields {
-                        self.push_value(f(self, MultiValue::new())?.pop_front().unwrap())?;
+                        mlua_assert!(f(self, 0)? == 1, "field function must return one value");
                         rawset_field(state, -2, &k)?;
                     }
                     rawset_field(state, metatable_index, "__index")?;
                 }
                 _ => {
+                    ffi::lua_pop(state, 1);
                     // Propagate fields to the field getters
                     for (k, f) in registry.fields {
                         registry.field_getters.push((k, f))
@@ -2704,17 +2781,28 @@ impl Lua {
         }
     }
 
-    // Returns `TypeId` for the LuaRef, checking that it's a registered
-    // and not destructed UserData.
+    // Returns `TypeId` for the `lref` userdata, checking that it's registered and not destructed.
     //
     // Returns `None` if the userdata is registered but non-static.
-    pub(crate) unsafe fn get_userdata_type_id(&self, lref: &LuaRef) -> Result<Option<TypeId>> {
-        let ref_thread = self.ref_thread();
-        if ffi::lua_getmetatable(ref_thread, lref.index) == 0 {
+    pub(crate) unsafe fn get_userdata_ref_type_id(&self, lref: &LuaRef) -> Result<Option<TypeId>> {
+        self.get_userdata_type_id_inner(self.ref_thread(), lref.index)
+    }
+
+    // Same as `get_userdata_ref_type_id` but assumes the userdata is already on the stack.
+    pub(crate) unsafe fn get_userdata_type_id(&self, idx: c_int) -> Result<Option<TypeId>> {
+        self.get_userdata_type_id_inner(self.state(), idx)
+    }
+
+    unsafe fn get_userdata_type_id_inner(
+        &self,
+        state: *mut ffi::lua_State,
+        idx: c_int,
+    ) -> Result<Option<TypeId>> {
+        if ffi::lua_getmetatable(state, idx) == 0 {
             return Err(Error::UserDataTypeMismatch);
         }
-        let mt_ptr = ffi::lua_topointer(ref_thread, -1);
-        ffi::lua_pop(ref_thread, 1);
+        let mt_ptr = ffi::lua_topointer(state, -1);
+        ffi::lua_pop(state, 1);
 
         // Fast path to skip looking up the metatable in the map
         let (last_mt, last_type_id) = (*self.extra.get()).last_checked_userdata_mt;
@@ -2737,7 +2825,7 @@ impl Lua {
     // Pushes a LuaRef (userdata) value onto the stack, returning their `TypeId`.
     // Uses 1 stack space, does not call checkstack.
     pub(crate) unsafe fn push_userdata_ref(&self, lref: &LuaRef) -> Result<Option<TypeId>> {
-        let type_id = self.get_userdata_type_id(lref)?;
+        let type_id = self.get_userdata_type_id_inner(self.ref_thread(), lref.index)?;
         self.push_ref(lref);
         Ok(type_id)
     }
@@ -2754,7 +2842,7 @@ impl Lua {
         &'lua self,
         func: Callback<'lua, 'static>,
     ) -> Result<Function<'lua>> {
-        unsafe extern "C" fn call_callback(state: *mut ffi::lua_State) -> c_int {
+        unsafe extern "C-unwind" fn call_callback(state: *mut ffi::lua_State) -> c_int {
             // Normal functions can be scoped and therefore destroyed,
             // so we need to check that the first upvalue is valid
             let (upvalue, extra) = match ffi::lua_type(state, ffi::lua_upvalueindex(1)) {
@@ -2772,24 +2860,9 @@ impl Lua {
 
                 let lua: &Lua = mem::transmute((*extra).inner.assume_init_ref());
                 let _guard = StateGuard::new(&lua.0, state);
-
-                let mut args = MultiValue::new_or_pooled(lua);
-                args.reserve(nargs as usize);
-                for _ in 0..nargs {
-                    args.push_front(lua.pop_value());
-                }
-
                 let func = &*(*upvalue).data;
-                let mut results = func(lua, args)?;
-                let nresults = results.len() as c_int;
 
-                check_stack(state, nresults)?;
-                for r in results.drain_all() {
-                    lua.push_value(r)?;
-                }
-                MultiValue::return_to_pool(results, lua);
-
-                Ok(nresults)
+                func(lua, nargs)
             })
         }
 
@@ -2832,7 +2905,7 @@ impl Lua {
             }
         }
 
-        unsafe extern "C" fn call_callback(state: *mut ffi::lua_State) -> c_int {
+        unsafe extern "C-unwind" fn call_callback(state: *mut ffi::lua_State) -> c_int {
             // Async functions cannot be scoped and therefore destroyed,
             // so the first upvalue is always valid
             let upvalue = get_userdata::<AsyncCallbackUpvalue>(state, ffi::lua_upvalueindex(1));
@@ -2842,12 +2915,7 @@ impl Lua {
                 let lua: &Lua = mem::transmute((*extra).inner.assume_init_ref());
                 let _guard = StateGuard::new(&lua.0, state);
 
-                let mut args = MultiValue::new_or_pooled(lua);
-                args.reserve(nargs as usize);
-                for _ in 0..nargs {
-                    args.push_front(lua.pop_value());
-                }
-
+                let args = MultiValue::from_stack_multi(nargs, lua)?;
                 let func = &*(*upvalue).data;
                 let fut = func(lua, args);
                 let extra = Arc::clone(&(*upvalue).extra);
@@ -2865,10 +2933,11 @@ impl Lua {
             })
         }
 
-        unsafe extern "C" fn poll_future(state: *mut ffi::lua_State) -> c_int {
+        unsafe extern "C-unwind" fn poll_future(state: *mut ffi::lua_State) -> c_int {
             let upvalue = get_userdata::<AsyncPollUpvalue>(state, ffi::lua_upvalueindex(1));
             let extra = (*upvalue).extra.get();
             callback_error_ext(state, extra, |_| {
+                // Lua ensures that `LUA_MINSTACK` stack spaces are available (after pushing arguments)
                 let lua: &Lua = mem::transmute((*extra).inner.assume_init_ref());
                 let _guard = StateGuard::new(&lua.0, state);
 
@@ -2876,21 +2945,20 @@ impl Lua {
                 let mut ctx = Context::from_waker(lua.waker());
                 match fut.as_mut().poll(&mut ctx) {
                     Poll::Pending => Ok(0),
-                    Poll::Ready(results) => {
-                        let mut results = results?;
-                        let nresults = results.len();
-                        lua.push_value(Value::Integer(nresults as _))?;
+                    Poll::Ready(nresults) => {
+                        let nresults = nresults?;
                         match nresults {
-                            0 => Ok(1),
-                            1 | 2 => {
-                                // Fast path for 1 or 2 results without creating a table
-                                for r in results.drain_all() {
-                                    lua.push_value(r)?;
+                            0..=2 => {
+                                // Fast path for up to 2 results without creating a table
+                                ffi::lua_pushinteger(state, nresults as _);
+                                if nresults > 0 {
+                                    ffi::lua_insert(state, -nresults - 1);
                                 }
-                                MultiValue::return_to_pool(results, lua);
-                                Ok(nresults as c_int + 1)
+                                Ok(nresults + 1)
                             }
                             _ => {
+                                let results = MultiValue::from_stack_multi(nresults, lua)?;
+                                ffi::lua_pushinteger(state, nresults as _);
                                 lua.push_value(Value::Table(lua.create_sequence_from(results)?))?;
                                 Ok(2)
                             }
@@ -2921,7 +2989,7 @@ impl Lua {
             Function(self.pop_ref())
         };
 
-        unsafe extern "C" fn unpack(state: *mut ffi::lua_State) -> c_int {
+        unsafe extern "C-unwind" fn unpack(state: *mut ffi::lua_State) -> c_int {
             let len = ffi::lua_tointeger(state, 2);
             ffi::luaL_checkstack(state, len as c_int, ptr::null());
             for i in 1..=len {
@@ -3050,9 +3118,10 @@ impl Lua {
             ffi::lua_setuservalue(state, -2);
         }
 
-        Ok(AnyUserData(self.pop_ref()))
+        Ok(AnyUserData(self.pop_ref(), SubtypeId::None))
     }
 
+    // Luau version located in `luau/mod.rs`
     #[cfg(not(feature = "luau"))]
     fn disable_c_modules(&self) -> Result<()> {
         let package: Table = self.globals().get("package")?;
@@ -3091,16 +3160,13 @@ impl Lua {
     #[inline]
     pub(crate) unsafe fn unlikely_memory_error(&self) -> bool {
         // MemoryInfo is empty in module mode so we cannot predict memory limits
-        (*self.extra.get())
-            .mem_state
-            .map(|x| x.as_ref().memory_limit() == 0)
-            .unwrap_or_else(|| {
-                // Alternatively, check the special flag (only for module mode)
-                #[cfg(feature = "module")]
-                return (*self.extra.get()).skip_memory_check;
-                #[cfg(not(feature = "module"))]
-                return false;
-            })
+        match MemoryState::get(self.main_state) {
+            mem_state if !mem_state.is_null() => (*mem_state).memory_limit() == 0,
+            #[cfg(feature = "module")]
+            _ => (*self.extra.get()).skip_memory_check, // Check the special flag (only for module mode)
+            #[cfg(not(feature = "module"))]
+            _ => false,
+        }
     }
 
     #[cfg(feature = "unstable")]
@@ -3128,13 +3194,13 @@ impl LuaInner {
     }
 
     #[inline]
-    pub(crate) fn new_multivalue_from_pool(&self) -> MultiValue {
+    pub(crate) fn pop_multivalue_from_pool(&self) -> Option<Vec<Value>> {
         let extra = unsafe { &mut *self.extra.get() };
-        extra.multivalue_pool.pop().unwrap_or_default()
+        extra.multivalue_pool.pop()
     }
 
     #[inline]
-    pub(crate) fn return_multivalue_to_pool(&self, mut multivalue: MultiValue) {
+    pub(crate) fn push_multivalue_to_pool(&self, mut multivalue: Vec<Value>) {
         let extra = unsafe { &mut *self.extra.get() };
         if extra.multivalue_pool.len() < MULTIVALUE_POOL_SIZE {
             multivalue.clear();
@@ -3145,14 +3211,6 @@ impl LuaInner {
     }
 }
 
-impl ExtraData {
-    #[cfg(feature = "luau")]
-    #[inline]
-    pub(crate) fn mem_state(&self) -> NonNull<MemoryState> {
-        self.mem_state.unwrap()
-    }
-}
-
 struct StateGuard<'a>(&'a LuaInner, *mut ffi::lua_State);
 
 impl<'a> StateGuard<'a> {
@@ -3168,13 +3226,13 @@ impl<'a> Drop for StateGuard<'a> {
     }
 }
 
-#[cfg(feature = "luau")]
 unsafe fn extra_data(state: *mut ffi::lua_State) -> *mut ExtraData {
-    (*ffi::lua_callbacks(state)).userdata as *mut ExtraData
-}
+    #[cfg(feature = "luau")]
+    if cfg!(not(feature = "module")) {
+        // In the main app we can use `lua_callbacks` to access ExtraData
+        return (*ffi::lua_callbacks(state)).userdata as *mut _;
+    }
 
-#[cfg(not(feature = "luau"))]
-unsafe fn extra_data(state: *mut ffi::lua_State) -> *mut ExtraData {
     let extra_key = &EXTRA_REGISTRY_KEY as *const u8 as *const c_void;
     if ffi::lua_rawgetp(state, ffi::LUA_REGISTRYINDEX, extra_key) != ffi::LUA_TUSERDATA {
         // `ExtraData` can be null only when Lua state is foreign.
@@ -3187,6 +3245,23 @@ unsafe fn extra_data(state: *mut ffi::lua_State) -> *mut ExtraData {
     (*extra_ptr).get()
 }
 
+unsafe fn set_extra_data(
+    state: *mut ffi::lua_State,
+    extra: &Arc<UnsafeCell<ExtraData>>,
+) -> Result<()> {
+    #[cfg(feature = "luau")]
+    if cfg!(not(feature = "module")) {
+        (*ffi::lua_callbacks(state)).userdata = extra.get() as *mut _;
+        return Ok(());
+    }
+
+    push_gc_userdata(state, Arc::clone(extra), true)?;
+    protect_lua!(state, 1, 0, fn(state) {
+        let extra_key = &EXTRA_REGISTRY_KEY as *const u8 as *const c_void;
+        ffi::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, extra_key);
+    })
+}
+
 // Creates required entries in the metatable cache (see `util::METATABLE_CACHE`)
 pub(crate) fn init_metatable_cache(cache: &mut FxHashMap<TypeId, u8>) {
     cache.insert(TypeId::of::<Arc<UnsafeCell<ExtraData>>>(), 0);
@@ -3425,6 +3500,12 @@ unsafe fn load_from_std_lib(state: *mut ffi::lua_State, libs: StdLib) -> Result<
         }
     }
 
+    #[cfg(feature = "luau")]
+    if libs.contains(StdLib::BUFFER) {
+        requiref(state, ffi::LUA_BUFFERLIBNAME, ffi::luaopen_buffer, 1)?;
+        ffi::lua_pop(state, 1);
+    }
+
     if libs.contains(StdLib::MATH) {
         requiref(state, ffi::LUA_MATHLIBNAME, ffi::luaopen_math, 1)?;
         ffi::lua_pop(state, 1);
@@ -3440,6 +3521,11 @@ unsafe fn load_from_std_lib(state: *mut ffi::lua_State, libs: StdLib) -> Result<
         requiref(state, ffi::LUA_LOADLIBNAME, ffi::luaopen_package, 1)?;
         ffi::lua_pop(state, 1);
     }
+    #[cfg(feature = "luau")]
+    if libs.contains(StdLib::PACKAGE) {
+        let lua: &Lua = mem::transmute((*extra_data(state)).inner.assume_init_ref());
+        crate::luau::register_package_module(lua)?;
+    }
 
     #[cfg(feature = "luajit")]
     {

src/luau/mod.rs

@@ -1,25 +1,19 @@
 use std::ffi::CStr;
 use std::os::raw::{c_float, c_int};
-use std::string::String as StdString;
 
-use crate::chunk::ChunkMode;
-use crate::error::{Error, Result};
+use crate::error::Result;
 use crate::lua::Lua;
-use crate::table::Table;
-use crate::util::{check_stack, StackGuard};
-use crate::value::Value;
 
-// Since Luau has some missing standard function, we re-implement them here
+// Since Luau has some missing standard functions, we re-implement them here
 
 impl Lua {
-    pub(crate) unsafe fn prepare_luau_state(&self) -> Result<()> {
+    pub(crate) unsafe fn configure_luau(&self) -> Result<()> {
         let globals = self.globals();
 
         globals.raw_set(
             "collectgarbage",
             self.create_c_function(lua_collectgarbage)?,
         )?;
-        globals.raw_set("require", self.create_function(lua_require)?)?;
         globals.raw_set("vector", self.create_c_function(lua_vector)?)?;
 
         // Set `_VERSION` global to include version number
@@ -30,9 +24,14 @@ impl Lua {
 
         Ok(())
     }
+
+    pub(crate) fn disable_c_modules(&self) -> Result<()> {
+        package::disable_dylibs(self);
+        Ok(())
+    }
 }
 
-unsafe extern "C" fn lua_collectgarbage(state: *mut ffi::lua_State) -> c_int {
+unsafe extern "C-unwind" fn lua_collectgarbage(state: *mut ffi::lua_State) -> c_int {
     let option = ffi::luaL_optstring(state, 1, cstr!("collect"));
     let option = CStr::from_ptr(option);
     let arg = ffi::luaL_optinteger(state, 2, 0);
@@ -69,60 +68,8 @@ unsafe extern "C" fn lua_collectgarbage(state: *mut ffi::lua_State) -> c_int {
     }
 }
 
-fn lua_require(lua: &Lua, name: Option<StdString>) -> Result<Value> {
-    let name = name.ok_or_else(|| Error::runtime("invalid module name"))?;
-
-    // Find module in the cache
-    let state = lua.state();
-    let loaded = unsafe {
-        let _sg = StackGuard::new(state);
-        check_stack(state, 2)?;
-        protect_lua!(state, 0, 1, fn(state) {
-            ffi::luaL_getsubtable(state, ffi::LUA_REGISTRYINDEX, cstr!("_LOADED"));
-        })?;
-        Table(lua.pop_ref())
-    };
-    if let Some(v) = loaded.raw_get(name.clone())? {
-        return Ok(v);
-    }
-
-    // Load file from filesystem
-    let mut search_path = std::env::var("LUAU_PATH").unwrap_or_default();
-    if search_path.is_empty() {
-        search_path = "?.luau;?.lua".into();
-    }
-
-    let (mut source, mut source_name) = (None, String::new());
-    for path in search_path.split(';') {
-        let file_path = path.replacen('?', &name, 1);
-        if let Ok(buf) = std::fs::read(&file_path) {
-            source = Some(buf);
-            source_name = file_path;
-            break;
-        }
-    }
-    let source = source.ok_or_else(|| Error::runtime(format!("cannot find '{name}'")))?;
-
-    let value = lua
-        .load(&source)
-        .set_name(&format!("={source_name}"))
-        .set_mode(ChunkMode::Text)
-        .call::<_, Value>(())?;
-
-    // Save in the cache
-    loaded.raw_set(
-        name,
-        match value.clone() {
-            Value::Nil => Value::Boolean(true),
-            v => v,
-        },
-    )?;
-
-    Ok(value)
-}
-
 // Luau vector datatype constructor
-unsafe extern "C" fn lua_vector(state: *mut ffi::lua_State) -> c_int {
+unsafe extern "C-unwind" fn lua_vector(state: *mut ffi::lua_State) -> c_int {
     let x = ffi::luaL_checknumber(state, 1) as c_float;
     let y = ffi::luaL_checknumber(state, 2) as c_float;
     let z = ffi::luaL_checknumber(state, 3) as c_float;
@@ -135,3 +82,7 @@ unsafe extern "C" fn lua_vector(state: *mut ffi::lua_State) -> c_int {
     ffi::lua_pushvector(state, x, y, z, w);
     1
 }
+
+pub(crate) use package::register_package_module;
+
+mod package;

src/luau/package.rs

@@ -0,0 +1,268 @@
+use std::ffi::CStr;
+use std::fmt::Write;
+use std::os::raw::c_int;
+use std::path::{PathBuf, MAIN_SEPARATOR_STR};
+use std::string::String as StdString;
+use std::{env, fs};
+
+use crate::chunk::ChunkMode;
+use crate::error::Result;
+use crate::lua::Lua;
+use crate::table::Table;
+use crate::types::RegistryKey;
+use crate::value::{IntoLua, Value};
+
+#[cfg(unix)]
+use {libloading::Library, rustc_hash::FxHashMap};
+
+//
+// Luau package module
+//
+
+#[cfg(unix)]
+const TARGET_MLUA_LUAU_ABI_VERSION: u32 = 1;
+
+#[cfg(all(unix, feature = "module"))]
+#[no_mangle]
+#[used]
+pub static MLUA_LUAU_ABI_VERSION: u32 = TARGET_MLUA_LUAU_ABI_VERSION;
+
+// We keep reference to the `package` table in registry under this key
+struct PackageKey(RegistryKey);
+
+// We keep reference to the loaded dylibs in application data
+#[cfg(unix)]
+struct LoadedDylibs(FxHashMap<PathBuf, Library>);
+
+#[cfg(unix)]
+impl std::ops::Deref for LoadedDylibs {
+    type Target = FxHashMap<PathBuf, Library>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+#[cfg(unix)]
+impl std::ops::DerefMut for LoadedDylibs {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+pub(crate) fn register_package_module(lua: &Lua) -> Result<()> {
+    // Create the package table and store it in app_data for later use (bypassing globals lookup)
+    let package = lua.create_table()?;
+    lua.set_app_data(PackageKey(lua.create_registry_value(package.clone())?));
+
+    // Set `package.path`
+    let mut search_path = env::var("LUAU_PATH")
+        .or_else(|_| env::var("LUA_PATH"))
+        .unwrap_or_default();
+    if search_path.is_empty() {
+        search_path = "?.luau;?.lua".to_string();
+    }
+    package.raw_set("path", search_path)?;
+
+    // Set `package.cpath`
+    #[cfg(unix)]
+    {
+        let mut search_cpath = env::var("LUAU_CPATH")
+            .or_else(|_| env::var("LUA_CPATH"))
+            .unwrap_or_default();
+        if search_cpath.is_empty() {
+            if cfg!(any(target_os = "macos", target_os = "ios")) {
+                search_cpath = "?.dylib".to_string();
+            } else {
+                search_cpath = "?.so".to_string();
+            }
+        }
+        package.raw_set("cpath", search_cpath)?;
+    }
+
+    // Set `package.loaded` (table with a list of loaded modules)
+    let loaded = lua.create_table()?;
+    package.raw_set("loaded", loaded.clone())?;
+    lua.set_named_registry_value("_LOADED", loaded)?;
+
+    // Set `package.loaders`
+    let loaders = lua.create_sequence_from([lua.create_function(lua_loader)?])?;
+    package.raw_set("loaders", loaders.clone())?;
+    #[cfg(unix)]
+    {
+        loaders.push(lua.create_function(dylib_loader)?)?;
+        lua.set_app_data(LoadedDylibs(FxHashMap::default()));
+    }
+    lua.set_named_registry_value("_LOADERS", loaders)?;
+
+    // Register the module and `require` function in globals
+    let globals = lua.globals();
+    globals.raw_set("package", package)?;
+    globals.raw_set("require", unsafe { lua.create_c_function(lua_require)? })?;
+
+    Ok(())
+}
+
+pub(crate) fn disable_dylibs(lua: &Lua) {
+    // Presence of `LoadedDylibs` in app data is used as a flag
+    // to check whether binary modules are enabled
+    #[cfg(unix)]
+    lua.remove_app_data::<LoadedDylibs>();
+}
+
+unsafe extern "C-unwind" fn lua_require(state: *mut ffi::lua_State) -> c_int {
+    ffi::lua_settop(state, 1);
+    let name = ffi::luaL_checkstring(state, 1);
+    ffi::luaL_getsubtable(state, ffi::LUA_REGISTRYINDEX, cstr!("_LOADED")); // _LOADED is at index 2
+    if ffi::lua_rawgetfield(state, 2, name) != ffi::LUA_TNIL {
+        return 1; // module is already loaded
+    }
+    ffi::lua_pop(state, 1); // remove nil
+
+    // load the module
+    let err_buf = ffi::lua_newuserdata_t::<StdString>(state);
+    err_buf.write(StdString::new());
+    ffi::luaL_getsubtable(state, ffi::LUA_REGISTRYINDEX, cstr!("_LOADERS")); // _LOADERS is at index 3
+    for i in 1.. {
+        if ffi::lua_rawgeti(state, -1, i) == ffi::LUA_TNIL {
+            // no more loaders?
+            if (*err_buf).is_empty() {
+                ffi::luaL_error(state, cstr!("module '%s' not found"), name);
+            } else {
+                let bytes = (*err_buf).as_bytes();
+                let extra = ffi::lua_pushlstring(state, bytes.as_ptr() as *const _, bytes.len());
+                ffi::luaL_error(state, cstr!("module '%s' not found:%s"), name, extra);
+            }
+        }
+        ffi::lua_pushvalue(state, 1); // name arg
+        ffi::lua_call(state, 1, 2); // call loader
+        match ffi::lua_type(state, -2) {
+            ffi::LUA_TFUNCTION => break, // loader found
+            ffi::LUA_TSTRING => {
+                // error message
+                let msg = ffi::lua_tostring(state, -2);
+                let msg = CStr::from_ptr(msg).to_string_lossy();
+                _ = write!(&mut *err_buf, "\n\t{msg}");
+            }
+            _ => {}
+        }
+        ffi::lua_pop(state, 2); // remove both results
+    }
+    ffi::lua_pushvalue(state, 1); // name is 1st argument to module loader
+    ffi::lua_rotate(state, -2, 1); // loader data <-> name
+
+    // stack: ...; loader function; module name; loader data
+    ffi::lua_call(state, 2, 1);
+    // stack: ...; result from loader function
+    if ffi::lua_isnil(state, -1) != 0 {
+        ffi::lua_pop(state, 1);
+        ffi::lua_pushboolean(state, 1); // use true as result
+    }
+    ffi::lua_pushvalue(state, -1); // make copy of entrypoint result
+    ffi::lua_setfield(state, 2, name); /* _LOADED[name] = returned value */
+    1
+}
+
+/// Searches for the given `name` in the given `path`.
+///
+/// `path` is a string containing a sequence of templates separated by semicolons.
+fn package_searchpath(name: &str, search_path: &str, try_prefix: bool) -> Option<PathBuf> {
+    let mut names = vec![name.replace('.', MAIN_SEPARATOR_STR)];
+    if try_prefix && name.contains('.') {
+        let prefix = name.split_once('.').map(|(prefix, _)| prefix).unwrap();
+        names.push(prefix.to_string());
+    }
+    for path in search_path.split(';') {
+        for name in &names {
+            let file_path = PathBuf::from(path.replace('?', name));
+            if let Ok(true) = fs::metadata(&file_path).map(|m| m.is_file()) {
+                return Some(file_path);
+            }
+        }
+    }
+    None
+}
+
+//
+// Module loaders
+//
+
+/// Tries to load a lua (text) file
+fn lua_loader(lua: &Lua, modname: StdString) -> Result<Value> {
+    let package = {
+        let key = lua.app_data_ref::<PackageKey>().unwrap();
+        lua.registry_value::<Table>(&key.0)
+    }?;
+    let search_path = package.get::<_, StdString>("path").unwrap_or_default();
+
+    if let Some(file_path) = package_searchpath(&modname, &search_path, false) {
+        match fs::read(&file_path) {
+            Ok(buf) => {
+                return lua
+                    .load(&buf)
+                    .set_name(&format!("={}", file_path.display()))
+                    .set_mode(ChunkMode::Text)
+                    .into_function()
+                    .map(Value::Function);
+            }
+            Err(err) => {
+                return format!("cannot open '{}': {err}", file_path.display()).into_lua(lua);
+            }
+        }
+    }
+
+    Ok(Value::Nil)
+}
+
+/// Tries to load a dynamic library
+#[cfg(unix)]
+fn dylib_loader(lua: &Lua, modname: StdString) -> Result<Value> {
+    let package = {
+        let key = lua.app_data_ref::<PackageKey>().unwrap();
+        lua.registry_value::<Table>(&key.0)
+    }?;
+    let search_cpath = package.get::<_, StdString>("cpath").unwrap_or_default();
+
+    let find_symbol = |lib: &Library| unsafe {
+        if let Ok(entry) = lib.get::<ffi::lua_CFunction>(format!("luaopen_{modname}\0").as_bytes())
+        {
+            return lua.create_c_function(*entry).map(Value::Function);
+        }
+        // Try all in one mode
+        if let Ok(entry) = lib.get::<ffi::lua_CFunction>(
+            format!("luaopen_{}\0", modname.replace('.', "_")).as_bytes(),
+        ) {
+            return lua.create_c_function(*entry).map(Value::Function);
+        }
+        "cannot find module entrypoint".into_lua(lua)
+    };
+
+    if let Some(file_path) = package_searchpath(&modname, &search_cpath, true) {
+        let file_path = file_path.canonicalize()?;
+        // Load the library and check for symbol
+        unsafe {
+            let mut loaded_dylibs = match lua.app_data_mut::<LoadedDylibs>() {
+                Some(loaded_dylibs) => loaded_dylibs,
+                None => return "dynamic libraries are disabled in safe mode".into_lua(lua),
+            };
+            // Check if it's already loaded
+            if let Some(lib) = loaded_dylibs.get(&file_path) {
+                return find_symbol(lib);
+            }
+            if let Ok(lib) = Library::new(&file_path) {
+                // Check version
+                let mod_version = lib.get::<*const u32>(b"MLUA_LUAU_ABI_VERSION");
+                let mod_version = mod_version.map(|v| **v).unwrap_or_default();
+                if mod_version != TARGET_MLUA_LUAU_ABI_VERSION {
+                    let err = format!("wrong module ABI version (expected {TARGET_MLUA_LUAU_ABI_VERSION}, got {mod_version})");
+                    return err.into_lua(lua);
+                }
+                let symbol = find_symbol(&lib);
+                loaded_dylibs.insert(file_path, lib);
+                return symbol;
+            }
+        }
+    }
+
+    Ok(Value::Nil)
+}

src/macros.rs

@@ -101,7 +101,8 @@ macro_rules! protect_lua {
     };
 
     ($state:expr, $nargs:expr, $nresults:expr, fn($state_inner:ident) $code:expr) => {{
-        unsafe extern "C" fn do_call($state_inner: *mut ffi::lua_State) -> ::std::os::raw::c_int {
+        use ::std::os::raw::c_int;
+        unsafe extern "C-unwind" fn do_call($state_inner: *mut ffi::lua_State) -> c_int {
             $code;
             let nresults = $nresults;
             if nresults == ::ffi::LUA_MULTRET {

src/memory.rs

@@ -2,11 +2,9 @@ use std::alloc::{self, Layout};
 use std::os::raw::c_void;
 use std::ptr;
 
-#[cfg(feature = "luau")]
-use crate::lua::ExtraData;
-
 pub(crate) static ALLOCATOR: ffi::lua_Alloc = allocator;
 
+#[repr(C)]
 #[derive(Default)]
 pub(crate) struct MemoryState {
     used_memory: isize,
@@ -20,6 +18,21 @@ pub(crate) struct MemoryState {
 }
 
 impl MemoryState {
+    #[inline]
+    pub(crate) unsafe fn get(state: *mut ffi::lua_State) -> *mut Self {
+        let mut mem_state = ptr::null_mut();
+        #[cfg(feature = "luau")]
+        {
+            ffi::lua_getallocf(state, &mut mem_state);
+            mlua_assert!(!mem_state.is_null(), "Luau state has no allocator userdata");
+        }
+        #[cfg(not(feature = "luau"))]
+        if ffi::lua_getallocf(state, &mut mem_state) != ALLOCATOR {
+            mem_state = ptr::null_mut();
+        }
+        mem_state as *mut MemoryState
+    }
+
     #[inline]
     pub(crate) fn used_memory(&self) -> usize {
         self.used_memory as usize
@@ -37,36 +50,21 @@ impl MemoryState {
         prev_limit as usize
     }
 
-    // This function is used primarily for calling `lua_pushcfunction` in lua5.1/jit
+    // This function is used primarily for calling `lua_pushcfunction` in lua5.1/jit/luau
     // to bypass the memory limit (if set).
-    #[cfg(any(feature = "lua51", feature = "luajit"))]
+    #[cfg(any(feature = "lua51", feature = "luajit", feature = "luau"))]
     #[inline]
     pub(crate) unsafe fn relax_limit_with(state: *mut ffi::lua_State, f: impl FnOnce()) {
-        let mut mem_state: *mut c_void = ptr::null_mut();
-        if ffi::lua_getallocf(state, &mut mem_state) == ALLOCATOR {
-            (*(mem_state as *mut MemoryState)).ignore_limit = true;
+        let mem_state = Self::get(state);
+        if !mem_state.is_null() {
+            (*mem_state).ignore_limit = true;
             f();
-            (*(mem_state as *mut MemoryState)).ignore_limit = false;
+            (*mem_state).ignore_limit = false;
         } else {
             f();
         }
     }
 
-    // Same as the above but for Luau
-    // It does not have `lua_getallocf` function, so instead we use `lua_callbacks`
-    #[cfg(feature = "luau")]
-    #[inline]
-    pub(crate) unsafe fn relax_limit_with(state: *mut ffi::lua_State, f: impl FnOnce()) {
-        let extra = (*ffi::lua_callbacks(state)).userdata as *mut ExtraData;
-        if extra.is_null() {
-            return f();
-        }
-        let mem_state = (*extra).mem_state();
-        (*mem_state.as_ptr()).ignore_limit = true;
-        f();
-        (*mem_state.as_ptr()).ignore_limit = false;
-    }
-
     // Does nothing apart from calling `f()`, we don't need to bypass any limits
     #[cfg(any(feature = "lua52", feature = "lua53", feature = "lua54"))]
     #[inline]
@@ -76,16 +74,13 @@ impl MemoryState {
 
     // Returns `true` if the memory limit was reached on the last memory operation
     #[cfg(feature = "luau")]
+    #[inline]
     pub(crate) unsafe fn limit_reached(state: *mut ffi::lua_State) -> bool {
-        let extra = (*ffi::lua_callbacks(state)).userdata as *mut ExtraData;
-        if extra.is_null() {
-            return false;
-        }
-        (*(*extra).mem_state().as_ptr()).limit_reached
+        (*Self::get(state)).limit_reached
     }
 }
 
-unsafe extern "C" fn allocator(
+unsafe extern "C-unwind" fn allocator(
     extra: *mut c_void,
     ptr: *mut c_void,
     osize: usize,

src/multi.rs

@@ -1,9 +1,11 @@
 use std::iter::FromIterator;
 use std::ops::{Deref, DerefMut};
+use std::os::raw::c_int;
 use std::result::Result as StdResult;
 
 use crate::error::Result;
 use crate::lua::Lua;
+use crate::util::check_stack;
 use crate::value::{FromLua, FromLuaMulti, IntoLua, IntoLuaMulti, MultiValue, Nil};
 
 /// Result is convertible to `MultiValue` following the common Lua idiom of returning the result
@@ -11,7 +13,7 @@ use crate::value::{FromLua, FromLuaMulti, IntoLua, IntoLuaMulti, MultiValue, Nil
 impl<'lua, T: IntoLua<'lua>, E: IntoLua<'lua>> IntoLuaMulti<'lua> for StdResult<T, E> {
     #[inline]
     fn into_lua_multi(self, lua: &'lua Lua) -> Result<MultiValue<'lua>> {
-        let mut result = MultiValue::new_or_pooled(lua);
+        let mut result = MultiValue::with_lua_and_capacity(lua, 2);
         match self {
             Ok(v) => result.push_front(v.into_lua(lua)?),
             Err(e) => {
@@ -23,33 +25,71 @@ impl<'lua, T: IntoLua<'lua>, E: IntoLua<'lua>> IntoLuaMulti<'lua> for StdResult<
     }
 }
 
+impl<'lua, E: IntoLua<'lua>> IntoLuaMulti<'lua> for StdResult<(), E> {
+    #[inline]
+    fn into_lua_multi(self, lua: &'lua Lua) -> Result<MultiValue<'lua>> {
+        match self {
+            Ok(_) => return Ok(MultiValue::new()),
+            Err(e) => {
+                let mut result = MultiValue::with_lua_and_capacity(lua, 2);
+                result.push_front(e.into_lua(lua)?);
+                result.push_front(Nil);
+                Ok(result)
+            }
+        }
+    }
+}
+
 impl<'lua, T: IntoLua<'lua>> IntoLuaMulti<'lua> for T {
     #[inline]
     fn into_lua_multi(self, lua: &'lua Lua) -> Result<MultiValue<'lua>> {
-        let mut v = MultiValue::new_or_pooled(lua);
+        let mut v = MultiValue::with_lua_and_capacity(lua, 1);
         v.push_front(self.into_lua(lua)?);
         Ok(v)
     }
+
+    #[inline]
+    unsafe fn push_into_stack_multi(self, lua: &'lua Lua) -> Result<c_int> {
+        self.push_into_stack(lua)?;
+        Ok(1)
+    }
 }
 
 impl<'lua, T: FromLua<'lua>> FromLuaMulti<'lua> for T {
     #[inline]
     fn from_lua_multi(mut values: MultiValue<'lua>, lua: &'lua Lua) -> Result<Self> {
-        let res = T::from_lua(values.pop_front().unwrap_or(Nil), lua);
-        MultiValue::return_to_pool(values, lua);
-        res
+        T::from_lua(values.pop_front().unwrap_or(Nil), lua)
     }
 
     #[inline]
-    fn from_lua_multi_args(
-        mut values: MultiValue<'lua>,
+    fn from_lua_args(
+        mut args: MultiValue<'lua>,
         i: usize,
         to: Option<&str>,
         lua: &'lua Lua,
     ) -> Result<Self> {
-        let res = T::from_lua_arg(values.pop_front().unwrap_or(Nil), i, to, lua);
-        MultiValue::return_to_pool(values, lua);
-        res
+        T::from_lua_arg(args.pop_front().unwrap_or(Nil), i, to, lua)
+    }
+
+    #[inline]
+    unsafe fn from_stack_multi(nvals: c_int, lua: &'lua Lua) -> Result<Self> {
+        if nvals == 0 {
+            return T::from_lua(Nil, lua);
+        }
+        T::from_stack(-nvals, lua)
+    }
+
+    #[inline]
+    unsafe fn from_stack_args(
+        nargs: c_int,
+        i: usize,
+        to: Option<&str>,
+        lua: &'lua Lua,
+    ) -> Result<Self> {
+        if nargs == 0 {
+            return T::from_lua_arg(Nil, i, to, lua);
+        }
+        T::from_stack_arg(-nargs, i, to, lua)
     }
 }
 
@@ -141,7 +181,7 @@ impl<T> DerefMut for Variadic<T> {
 impl<'lua, T: IntoLua<'lua>> IntoLuaMulti<'lua> for Variadic<T> {
     #[inline]
     fn into_lua_multi(self, lua: &'lua Lua) -> Result<MultiValue<'lua>> {
-        let mut values = MultiValue::new_or_pooled(lua);
+        let mut values = MultiValue::with_lua_and_capacity(lua, self.0.len());
         values.refill(self.0.into_iter().map(|e| e.into_lua(lua)))?;
         Ok(values)
     }
@@ -150,13 +190,11 @@ impl<'lua, T: IntoLua<'lua>> IntoLuaMulti<'lua> for Variadic<T> {
 impl<'lua, T: FromLua<'lua>> FromLuaMulti<'lua> for Variadic<T> {
     #[inline]
     fn from_lua_multi(mut values: MultiValue<'lua>, lua: &'lua Lua) -> Result<Self> {
-        let res = values
+        values
             .drain_all()
             .map(|e| T::from_lua(e, lua))
             .collect::<Result<Vec<T>>>()
-            .map(Variadic);
-        MultiValue::return_to_pool(values, lua);
-        res
+            .map(Variadic)
     }
 }
 
@@ -165,14 +203,26 @@ macro_rules! impl_tuple {
         impl<'lua> IntoLuaMulti<'lua> for () {
             #[inline]
             fn into_lua_multi(self, lua: &'lua Lua) -> Result<MultiValue<'lua>> {
-                Ok(MultiValue::new_or_pooled(lua))
+                Ok(MultiValue::with_lua_and_capacity(lua, 0))
+            }
+
+            #[inline]
+            unsafe fn push_into_stack_multi(self, _lua: &'lua Lua) -> Result<c_int> {
+                Ok(0)
             }
         }
 
         impl<'lua> FromLuaMulti<'lua> for () {
             #[inline]
-            fn from_lua_multi(values: MultiValue<'lua>, lua: &'lua Lua) -> Result<Self> {
-                MultiValue::return_to_pool(values, lua);
+            fn from_lua_multi(_values: MultiValue<'lua>, _lua: &'lua Lua) -> Result<Self> {
+                Ok(())
+            }
+
+            #[inline]
+            unsafe fn from_stack_multi(nvals: c_int, lua: &'lua Lua) -> Result<Self> {
+                if nvals > 0 {
+                    ffi::lua_pop(lua.state(), nvals);
+                }
                 Ok(())
             }
         }
@@ -183,8 +233,7 @@ macro_rules! impl_tuple {
             where $($name: IntoLua<'lua>,)*
                   $last: IntoLuaMulti<'lua>
         {
-            #[allow(unused_mut)]
-            #[allow(non_snake_case)]
+            #[allow(unused_mut, non_snake_case)]
             #[inline]
             fn into_lua_multi(self, lua: &'lua Lua) -> Result<MultiValue<'lua>> {
                 let ($($name,)* $last,) = self;
@@ -193,14 +242,30 @@ macro_rules! impl_tuple {
                 push_reverse!(results, $($name.into_lua(lua)?,)*);
                 Ok(results)
             }
+
+            #[allow(non_snake_case)]
+            #[inline]
+            unsafe fn push_into_stack_multi(self, lua: &'lua Lua) -> Result<c_int> {
+                let ($($name,)* $last,) = self;
+                let mut nresults = 0;
+                $(
+                    _ = $name;
+                    nresults += 1;
+                )*
+                check_stack(lua.state(), nresults + 1)?;
+                $(
+                    $name.push_into_stack(lua)?;
+                )*
+                nresults += $last.push_into_stack_multi(lua)?;
+                Ok(nresults)
+            }
         }
 
         impl<'lua, $($name,)* $last> FromLuaMulti<'lua> for ($($name,)* $last,)
             where $($name: FromLua<'lua>,)*
                   $last: FromLuaMulti<'lua>
         {
-            #[allow(unused_mut)]
-            #[allow(non_snake_case)]
+            #[allow(unused_mut, non_snake_case)]
             #[inline]
             fn from_lua_multi(mut values: MultiValue<'lua>, lua: &'lua Lua) -> Result<Self> {
                 $(let $name = FromLua::from_lua(values.pop_front().unwrap_or(Nil), lua)?;)*
@@ -208,15 +273,45 @@ macro_rules! impl_tuple {
                 Ok(($($name,)* $last,))
             }
 
-            #[allow(unused_mut)]
-            #[allow(non_snake_case)]
+            #[allow(unused_mut, non_snake_case)]
             #[inline]
-            fn from_lua_multi_args(mut values: MultiValue<'lua>, mut i: usize, to: Option<&str>, lua: &'lua Lua) -> Result<Self> {
+            fn from_lua_args(mut args: MultiValue<'lua>, mut i: usize, to: Option<&str>, lua: &'lua Lua) -> Result<Self> {
                 $(
-                    let $name = FromLua::from_lua_arg(values.pop_front().unwrap_or(Nil), i, to, lua)?;
+                    let $name = FromLua::from_lua_arg(args.pop_front().unwrap_or(Nil), i, to, lua)?;
                     i += 1;
                 )*
-                let $last = FromLuaMulti::from_lua_multi_args(values, i, to, lua)?;
+                let $last = FromLuaMulti::from_lua_args(args, i, to, lua)?;
+                Ok(($($name,)* $last,))
+            }
+
+            #[allow(unused_mut, non_snake_case)]
+            #[inline]
+            unsafe fn from_stack_multi(mut nvals: c_int, lua: &'lua Lua) -> Result<Self> {
+                $(
+                    let $name = if nvals > 0 {
+                        nvals -= 1;
+                        FromLua::from_stack(-(nvals + 1), lua)
+                    } else {
+                        FromLua::from_lua(Nil, lua)
+                    }?;
+                )*
+                let $last = FromLuaMulti::from_stack_multi(nvals, lua)?;
+                Ok(($($name,)* $last,))
+            }
+
+            #[allow(unused_mut, non_snake_case)]
+            #[inline]
+            unsafe fn from_stack_args(mut nargs: c_int, mut i: usize, to: Option<&str>, lua: &'lua Lua) -> Result<Self> {
+                $(
+                    let $name = if nargs > 0 {
+                        nargs -= 1;
+                        FromLua::from_stack_arg(-(nargs + 1), i, to, lua)
+                    } else {
+                        FromLua::from_lua_arg(Nil, i, to, lua)
+                    }?;
+                    i += 1;
+                )*
+                let $last = FromLuaMulti::from_stack_args(nargs, i, to, lua)?;
                 Ok(($($name,)* $last,))
             }
         }

src/prelude.rs

@@ -40,5 +40,5 @@ pub use crate::{
 #[doc(no_inline)]
 pub use crate::{
     OwnedAnyUserData as LuaOwnedAnyUserData, OwnedFunction as LuaOwnedFunction,
-    OwnedString as LuaOwnedString, OwnedTable as LuaOwnedTable,
+    OwnedString as LuaOwnedString, OwnedTable as LuaOwnedTable, OwnedThread as LuaOwnedThread,
 };

src/scope.rs

@@ -2,6 +2,7 @@ use std::any::Any;
 use std::cell::{Cell, RefCell};
 use std::marker::PhantomData;
 use std::mem;
+use std::os::raw::c_int;
 
 #[cfg(feature = "serialize")]
 use serde::Serialize;
@@ -9,16 +10,16 @@ use serde::Serialize;
 use crate::error::{Error, Result};
 use crate::function::Function;
 use crate::lua::Lua;
-use crate::types::{Callback, CallbackUpvalue, LuaRef, MaybeSend};
+use crate::types::{Callback, CallbackUpvalue, LuaRef, MaybeSend, SubtypeId};
 use crate::userdata::{
     AnyUserData, MetaMethod, UserData, UserDataCell, UserDataFields, UserDataMethods,
 };
 use crate::userdata_impl::UserDataRegistry;
 use crate::util::{
-    self, assert_stack, check_stack, get_userdata, init_userdata_metatable, push_table,
-    rawset_field, take_userdata, StackGuard,
+    self, assert_stack, check_stack, init_userdata_metatable, push_string, push_table,
+    rawset_field, short_type_name, take_userdata, StackGuard,
 };
-use crate::value::{FromLua, FromLuaMulti, IntoLua, IntoLuaMulti, MultiValue, Value};
+use crate::value::{FromLua, FromLuaMulti, IntoLua, IntoLuaMulti, Value};
 
 #[cfg(feature = "lua54")]
 use crate::userdata::USER_VALUE_MAXSLOT;
@@ -75,8 +76,9 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
         // to make sure callbacks can't capture handles with lifetime outside the scope, inside the
         // scope, and owned inside the callback itself.
         unsafe {
-            self.create_callback(Box::new(move |lua, args| {
-                func(lua, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
+            self.create_callback(Box::new(move |lua, nargs| {
+                let args = A::from_stack_args(nargs, 1, None, lua)?;
+                func(lua, args)?.push_into_stack_multi(lua)
             }))
         }
     }
@@ -186,6 +188,23 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
         }
     }
 
+    /// Creates a Lua userdata object from a custom Rust type.
+    ///
+    /// This is a version of [`Lua::create_any_userdata`] that creates a userdata which expires on
+    /// scope drop and does not require that the userdata type be Send (but still requires that the
+    /// UserData be 'static). See [`Lua::scope`] for more details.
+    #[inline]
+    pub fn create_any_userdata<T>(&self, data: T) -> Result<AnyUserData<'lua>>
+    where
+        T: 'static,
+    {
+        unsafe {
+            let ud = self.lua.make_any_userdata(UserDataCell::new(data))?;
+            self.seal_userdata::<T>(&ud)?;
+            Ok(ud)
+        }
+    }
+
     /// Creates a Lua userdata object from a reference to custom Rust type.
     ///
     /// This is a version of [`Lua::create_any_userdata`] that creates a userdata which expires on
@@ -293,9 +312,10 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
         // 'lua. This is safe though, because `UserData::add_methods` does not get to pick the 'lua
         // lifetime, so none of the static methods UserData types can add can possibly capture
         // parameters.
-        fn wrap_method<'scope, 'lua, 'callback: 'scope, T: 'scope>(
+        unsafe fn wrap_method<'scope, 'lua, 'callback: 'scope, T: 'scope>(
             scope: &Scope<'lua, 'scope>,
             ud_ptr: *const UserDataCell<T>,
+            name: &str,
             method: NonStaticMethod<'callback, T>,
         ) -> Result<Function<'lua>> {
             // On methods that actually receive the userdata, we fake a type check on the passed in
@@ -305,61 +325,56 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
             // with a type mismatch, but here without this check would proceed as though you had
             // called the method on the original value (since we otherwise completely ignore the
             // first argument).
-            let check_ud_type = move |lua: &Lua, value| -> Result<&UserDataCell<T>> {
-                if let Some(Value::UserData(ud)) = value {
-                    let state = lua.state();
-                    unsafe {
-                        let _sg = StackGuard::new(state);
-                        check_stack(state, 2)?;
-                        lua.push_userdata_ref(&ud.0)?;
-                        if get_userdata(state, -1) as *const _ == ud_ptr {
-                            return Ok(&*ud_ptr);
-                        }
-                    }
-                };
-                Err(Error::UserDataTypeMismatch)
+            let func_name = format!("{}.{name}", short_type_name::<T>());
+            let check_self_type = move |lua: &Lua, nargs: c_int| -> Result<&UserDataCell<T>> {
+                let state = lua.state();
+                if nargs > 0 && ffi::lua_touserdata(state, -nargs) as *const _ == ud_ptr {
+                    return Ok(&*ud_ptr);
+                }
+                Err(Error::bad_self_argument(
+                    &func_name,
+                    Error::UserDataTypeMismatch,
+                ))
             };
 
             match method {
                 NonStaticMethod::Method(method) => {
-                    let f = Box::new(move |lua, mut args: MultiValue<'callback>| {
-                        let data = check_ud_type(lua, args.pop_front())?;
+                    let f = Box::new(move |lua, nargs| {
+                        let data = check_self_type(lua, nargs)?;
                         let data = data.try_borrow()?;
-                        method(lua, &*data, args)
+                        method(lua, &*data, nargs - 1)
                     });
-                    unsafe { scope.create_callback(f) }
+                    scope.create_callback(f)
                 }
                 NonStaticMethod::MethodMut(method) => {
                     let method = RefCell::new(method);
-                    let f = Box::new(move |lua, mut args: MultiValue<'callback>| {
-                        let data = check_ud_type(lua, args.pop_front())?;
+                    let f = Box::new(move |lua, nargs| {
+                        let data = check_self_type(lua, nargs)?;
                         let mut method = method
                             .try_borrow_mut()
                             .map_err(|_| Error::RecursiveMutCallback)?;
                         let mut data = data.try_borrow_mut()?;
-                        (*method)(lua, &mut *data, args)
+                        (*method)(lua, &mut *data, nargs - 1)
                     });
-                    unsafe { scope.create_callback(f) }
+                    scope.create_callback(f)
                 }
-                NonStaticMethod::Function(function) => unsafe { scope.create_callback(function) },
+                NonStaticMethod::Function(function) => scope.create_callback(function),
                 NonStaticMethod::FunctionMut(function) => {
                     let function = RefCell::new(function);
-                    let f = Box::new(move |lua, args| {
-                        (*function
+                    let f = Box::new(move |lua, nargs| {
+                        let mut func = function
                             .try_borrow_mut()
-                            .map_err(|_| Error::RecursiveMutCallback)?)(
-                            lua, args
-                        )
+                            .map_err(|_| Error::RecursiveMutCallback)?;
+                        func(lua, nargs)
                     });
-                    unsafe { scope.create_callback(f) }
+                    scope.create_callback(f)
                 }
             }
         }
 
-        let mut ud_fields = NonStaticUserDataFields::default();
-        let mut ud_methods = NonStaticUserDataMethods::default();
-        T::add_fields(&mut ud_fields);
-        T::add_methods(&mut ud_methods);
+        let mut registry = NonStaticUserDataRegistry::new();
+        T::add_fields(&mut registry);
+        T::add_methods(&mut registry);
 
         let lua = self.lua;
         let state = lua.state();
@@ -387,48 +402,83 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
             };
 
             // Prepare metatable, add meta methods first and then meta fields
-            let meta_methods_nrec = ud_methods.meta_methods.len() + ud_fields.meta_fields.len() + 1;
+            let meta_methods_nrec = registry.meta_methods.len() + registry.meta_fields.len() + 1;
             push_table(state, 0, meta_methods_nrec, true)?;
-
-            for (k, m) in ud_methods.meta_methods {
-                lua.push_value(Value::Function(wrap_method(self, ud_ptr, m)?))?;
+            for (k, m) in registry.meta_methods {
+                lua.push_value(Value::Function(wrap_method(self, ud_ptr, &k, m)?))?;
                 rawset_field(state, -2, MetaMethod::validate(&k)?)?;
             }
-            for (k, f) in ud_fields.meta_fields {
-                lua.push_value(f(lua, MultiValue::new())?.pop_front().unwrap())?;
+            let mut has_name = false;
+            for (k, f) in registry.meta_fields {
+                has_name = has_name || k == MetaMethod::Type;
+                mlua_assert!(f(lua, 0)? == 1, "field function must return one value");
                 rawset_field(state, -2, MetaMethod::validate(&k)?)?;
             }
+            // Set `__name/__type` if not provided
+            if !has_name {
+                let type_name = short_type_name::<T>();
+                push_string(state, type_name.as_bytes(), !lua.unlikely_memory_error())?;
+                rawset_field(state, -2, MetaMethod::Type.name())?;
+            }
             let metatable_index = ffi::lua_absindex(state, -1);
 
+            let fields_nrec = registry.fields.len();
+            if fields_nrec > 0 {
+                // If __index is a table then update it inplace
+                let index_type = ffi::lua_getfield(state, metatable_index, cstr!("__index"));
+                match index_type {
+                    ffi::LUA_TNIL | ffi::LUA_TTABLE => {
+                        if index_type == ffi::LUA_TNIL {
+                            // Create a new table
+                            ffi::lua_pop(state, 1);
+                            push_table(state, 0, fields_nrec, true)?;
+                        }
+                        for (k, f) in registry.fields {
+                            #[rustfmt::skip]
+                            let NonStaticMethod::Function(f) = f else { unreachable!() };
+                            mlua_assert!(f(lua, 0)? == 1, "field function must return one value");
+                            rawset_field(state, -2, &k)?;
+                        }
+                        rawset_field(state, metatable_index, "__index")?;
+                    }
+                    _ => {
+                        // Propagate fields to the field getters
+                        for (k, f) in registry.fields {
+                            registry.field_getters.push((k, f))
+                        }
+                    }
+                }
+            }
+
             let mut field_getters_index = None;
-            let field_getters_nrec = ud_fields.field_getters.len();
+            let field_getters_nrec = registry.field_getters.len();
             if field_getters_nrec > 0 {
                 push_table(state, 0, field_getters_nrec, true)?;
-                for (k, m) in ud_fields.field_getters {
-                    lua.push_value(Value::Function(wrap_method(self, ud_ptr, m)?))?;
+                for (k, m) in registry.field_getters {
+                    lua.push_value(Value::Function(wrap_method(self, ud_ptr, &k, m)?))?;
                     rawset_field(state, -2, &k)?;
                 }
                 field_getters_index = Some(ffi::lua_absindex(state, -1));
             }
 
             let mut field_setters_index = None;
-            let field_setters_nrec = ud_fields.field_setters.len();
+            let field_setters_nrec = registry.field_setters.len();
             if field_setters_nrec > 0 {
                 push_table(state, 0, field_setters_nrec, true)?;
-                for (k, m) in ud_fields.field_setters {
-                    lua.push_value(Value::Function(wrap_method(self, ud_ptr, m)?))?;
+                for (k, m) in registry.field_setters {
+                    lua.push_value(Value::Function(wrap_method(self, ud_ptr, &k, m)?))?;
                     rawset_field(state, -2, &k)?;
                 }
                 field_setters_index = Some(ffi::lua_absindex(state, -1));
             }
 
             let mut methods_index = None;
-            let methods_nrec = ud_methods.methods.len();
+            let methods_nrec = registry.methods.len();
             if methods_nrec > 0 {
                 // Create table used for methods lookup
                 push_table(state, 0, methods_nrec, true)?;
-                for (k, m) in ud_methods.methods {
-                    lua.push_value(Value::Function(wrap_method(self, ud_ptr, m)?))?;
+                for (k, m) in registry.methods {
+                    lua.push_value(Value::Function(wrap_method(self, ud_ptr, &k, m)?))?;
                     rawset_field(state, -2, &k)?;
                 }
                 methods_index = Some(ffi::lua_absindex(state, -1));
@@ -461,7 +511,7 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
             #[cfg(not(feature = "luau"))]
             std::ptr::write(ud_ptr as _, UserDataCell::new(data));
             ffi::lua_setmetatable(state, -2);
-            let ud = AnyUserData(lua.pop_ref());
+            let ud = AnyUserData(lua.pop_ref(), SubtypeId::None);
             lua.register_raw_userdata_metatable(mt_ptr, None);
 
             #[cfg(any(feature = "lua51", feature = "luajit"))]
@@ -572,35 +622,144 @@ impl<'lua, 'scope> Drop for Scope<'lua, 'scope> {
 
 #[allow(clippy::type_complexity)]
 enum NonStaticMethod<'lua, T> {
-    Method(Box<dyn Fn(&'lua Lua, &T, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
-    MethodMut(Box<dyn FnMut(&'lua Lua, &mut T, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
-    Function(Box<dyn Fn(&'lua Lua, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
-    FunctionMut(Box<dyn FnMut(&'lua Lua, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
+    Method(Box<dyn Fn(&'lua Lua, &T, c_int) -> Result<c_int>>),
+    MethodMut(Box<dyn FnMut(&'lua Lua, &mut T, c_int) -> Result<c_int>>),
+    Function(Box<dyn Fn(&'lua Lua, c_int) -> Result<c_int>>),
+    FunctionMut(Box<dyn FnMut(&'lua Lua, c_int) -> Result<c_int>>),
 }
 
-struct NonStaticUserDataMethods<'lua, T: UserData> {
+struct NonStaticUserDataRegistry<'lua, T> {
+    // Fields
+    fields: Vec<(String, NonStaticMethod<'lua, T>)>,
+    field_getters: Vec<(String, NonStaticMethod<'lua, T>)>,
+    field_setters: Vec<(String, NonStaticMethod<'lua, T>)>,
+    meta_fields: Vec<(String, Callback<'lua, 'static>)>,
+
+    // Methods
     methods: Vec<(String, NonStaticMethod<'lua, T>)>,
     meta_methods: Vec<(String, NonStaticMethod<'lua, T>)>,
 }
 
-impl<'lua, T: UserData> Default for NonStaticUserDataMethods<'lua, T> {
-    fn default() -> NonStaticUserDataMethods<'lua, T> {
-        NonStaticUserDataMethods {
+impl<'lua, T> NonStaticUserDataRegistry<'lua, T> {
+    const fn new() -> NonStaticUserDataRegistry<'lua, T> {
+        NonStaticUserDataRegistry {
+            fields: Vec::new(),
+            field_getters: Vec::new(),
+            field_setters: Vec::new(),
+            meta_fields: Vec::new(),
             methods: Vec::new(),
             meta_methods: Vec::new(),
         }
     }
 }
 
-impl<'lua, T: UserData> UserDataMethods<'lua, T> for NonStaticUserDataMethods<'lua, T> {
+impl<'lua, T> UserDataFields<'lua, T> for NonStaticUserDataRegistry<'lua, T> {
+    fn add_field<V>(&mut self, name: impl AsRef<str>, value: V)
+    where
+        V: IntoLua<'lua> + Clone + 'static,
+    {
+        let name = name.as_ref().to_string();
+        self.fields.push((
+            name,
+            NonStaticMethod::Function(Box::new(move |lua, _| unsafe {
+                value.clone().push_into_stack_multi(lua)
+            })),
+        ));
+    }
+
+    fn add_field_method_get<M, R>(&mut self, name: impl AsRef<str>, method: M)
+    where
+        M: Fn(&'lua Lua, &T) -> Result<R> + MaybeSend + 'static,
+        R: IntoLua<'lua>,
+    {
+        let method = NonStaticMethod::Method(Box::new(move |lua, ud, _| unsafe {
+            method(lua, ud)?.push_into_stack_multi(lua)
+        }));
+        self.field_getters.push((name.as_ref().into(), method));
+    }
+
+    fn add_field_method_set<M, A>(&mut self, name: impl AsRef<str>, mut method: M)
+    where
+        M: FnMut(&'lua Lua, &mut T, A) -> Result<()> + MaybeSend + 'static,
+        A: FromLua<'lua>,
+    {
+        let func_name = format!("{}.{}", short_type_name::<T>(), name.as_ref());
+        let method = NonStaticMethod::MethodMut(Box::new(move |lua, ud, nargs| unsafe {
+            let val = A::from_stack_args(nargs, 2, Some(&func_name), lua)?;
+            method(lua, ud, val)?.push_into_stack_multi(lua)
+        }));
+        self.field_setters.push((name.as_ref().into(), method));
+    }
+
+    fn add_field_function_get<F, R>(&mut self, name: impl AsRef<str>, function: F)
+    where
+        F: Fn(&'lua Lua, AnyUserData<'lua>) -> Result<R> + MaybeSend + 'static,
+        R: IntoLua<'lua>,
+    {
+        let func_name = format!("{}.{}", short_type_name::<T>(), name.as_ref());
+        let func = NonStaticMethod::Function(Box::new(move |lua, nargs| unsafe {
+            let ud = AnyUserData::from_stack_args(nargs, 1, Some(&func_name), lua)?;
+            function(lua, ud)?.push_into_stack_multi(lua)
+        }));
+        self.field_getters.push((name.as_ref().into(), func));
+    }
+
+    fn add_field_function_set<F, A>(&mut self, name: impl AsRef<str>, mut function: F)
+    where
+        F: FnMut(&'lua Lua, AnyUserData<'lua>, A) -> Result<()> + MaybeSend + 'static,
+        A: FromLua<'lua>,
+    {
+        let func_name = format!("{}.{}", short_type_name::<T>(), name.as_ref());
+        let func = NonStaticMethod::FunctionMut(Box::new(move |lua, nargs| unsafe {
+            let (ud, val) = <_>::from_stack_args(nargs, 1, Some(&func_name), lua)?;
+            function(lua, ud, val)?.push_into_stack_multi(lua)
+        }));
+        self.field_setters.push((name.as_ref().into(), func));
+    }
+
+    fn add_meta_field<V>(&mut self, name: impl AsRef<str>, value: V)
+    where
+        V: IntoLua<'lua> + Clone + 'static,
+    {
+        let name = name.as_ref().to_string();
+        let name2 = name.clone();
+        self.meta_fields.push((
+            name,
+            Box::new(move |lua, _| unsafe {
+                UserDataRegistry::<()>::check_meta_field(lua, &name2, value.clone())?
+                    .push_into_stack_multi(lua)
+            }),
+        ));
+    }
+
+    fn add_meta_field_with<F, R>(&mut self, name: impl AsRef<str>, f: F)
+    where
+        F: Fn(&'lua Lua) -> Result<R> + MaybeSend + 'static,
+        R: IntoLua<'lua>,
+    {
+        let name = name.as_ref().to_string();
+        let name2 = name.clone();
+        self.meta_fields.push((
+            name,
+            Box::new(move |lua, _| unsafe {
+                UserDataRegistry::<()>::check_meta_field(lua, &name2, f(lua)?)?
+                    .push_into_stack_multi(lua)
+            }),
+        ));
+    }
+}
+
+impl<'lua, T> UserDataMethods<'lua, T> for NonStaticUserDataRegistry<'lua, T> {
     fn add_method<M, A, R>(&mut self, name: impl AsRef<str>, method: M)
     where
         M: Fn(&'lua Lua, &T, A) -> Result<R> + MaybeSend + 'static,
         A: FromLuaMulti<'lua>,
         R: IntoLuaMulti<'lua>,
     {
-        let method = NonStaticMethod::Method(Box::new(move |lua, ud, args| {
-            method(lua, ud, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
+        let func_name = format!("{}.{}", short_type_name::<T>(), name.as_ref());
+        let method = NonStaticMethod::Method(Box::new(move |lua, ud, nargs| unsafe {
+            let args = A::from_stack_args(nargs, 2, Some(&func_name), lua)?;
+            method(lua, ud, args)?.push_into_stack_multi(lua)
         }));
         self.methods.push((name.as_ref().into(), method));
     }
@@ -611,8 +770,10 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> for NonStaticUserDataMethods<'l
         A: FromLuaMulti<'lua>,
         R: IntoLuaMulti<'lua>,
     {
-        let method = NonStaticMethod::MethodMut(Box::new(move |lua, ud, args| {
-            method(lua, ud, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
+        let func_name = format!("{}.{}", short_type_name::<T>(), name.as_ref());
+        let method = NonStaticMethod::MethodMut(Box::new(move |lua, ud, nargs| unsafe {
+            let args = A::from_stack_args(nargs, 2, Some(&func_name), lua)?;
+            method(lua, ud, args)?.push_into_stack_multi(lua)
         }));
         self.methods.push((name.as_ref().into(), method));
     }
@@ -653,8 +814,10 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> for NonStaticUserDataMethods<'l
         A: FromLuaMulti<'lua>,
         R: IntoLuaMulti<'lua>,
     {
-        let func = NonStaticMethod::Function(Box::new(move |lua, args| {
-            function(lua, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
+        let func_name = format!("{}.{}", short_type_name::<T>(), name.as_ref());
+        let func = NonStaticMethod::Function(Box::new(move |lua, nargs| unsafe {
+            let args = A::from_stack_args(nargs, 1, Some(&func_name), lua)?;
+            function(lua, args)?.push_into_stack_multi(lua)
         }));
         self.methods.push((name.as_ref().into(), func));
     }
@@ -665,8 +828,10 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> for NonStaticUserDataMethods<'l
         A: FromLuaMulti<'lua>,
         R: IntoLuaMulti<'lua>,
     {
-        let func = NonStaticMethod::FunctionMut(Box::new(move |lua, args| {
-            function(lua, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
+        let func_name = format!("{}.{}", short_type_name::<T>(), name.as_ref());
+        let func = NonStaticMethod::FunctionMut(Box::new(move |lua, nargs| unsafe {
+            let args = A::from_stack_args(nargs, 1, Some(&func_name), lua)?;
+            function(lua, args)?.push_into_stack_multi(lua)
         }));
         self.methods.push((name.as_ref().into(), func));
     }
@@ -690,8 +855,10 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> for NonStaticUserDataMethods<'l
         A: FromLuaMulti<'lua>,
         R: IntoLuaMulti<'lua>,
     {
-        let method = NonStaticMethod::Method(Box::new(move |lua, ud, args| {
-            method(lua, ud, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
+        let func_name = format!("{}.{}", short_type_name::<T>(), name.as_ref());
+        let method = NonStaticMethod::Method(Box::new(move |lua, ud, nargs| unsafe {
+            let args = A::from_stack_args(nargs, 2, Some(&func_name), lua)?;
+            method(lua, ud, args)?.push_into_stack_multi(lua)
         }));
         self.meta_methods.push((name.as_ref().into(), method));
     }
@@ -702,8 +869,10 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> for NonStaticUserDataMethods<'l
         A: FromLuaMulti<'lua>,
         R: IntoLuaMulti<'lua>,
     {
-        let method = NonStaticMethod::MethodMut(Box::new(move |lua, ud, args| {
-            method(lua, ud, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
+        let func_name = format!("{}.{}", short_type_name::<T>(), name.as_ref());
+        let method = NonStaticMethod::MethodMut(Box::new(move |lua, ud, nargs| unsafe {
+            let args = A::from_stack_args(nargs, 2, Some(&func_name), lua)?;
+            method(lua, ud, args)?.push_into_stack_multi(lua)
         }));
         self.meta_methods.push((name.as_ref().into(), method));
     }
@@ -744,8 +913,10 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> for NonStaticUserDataMethods<'l
         A: FromLuaMulti<'lua>,
         R: IntoLuaMulti<'lua>,
     {
-        let func = NonStaticMethod::Function(Box::new(move |lua, args| {
-            function(lua, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
+        let func_name = format!("{}.{}", short_type_name::<T>(), name.as_ref());
+        let func = NonStaticMethod::Function(Box::new(move |lua, nargs| unsafe {
+            let args = A::from_stack_args(nargs, 1, Some(&func_name), lua)?;
+            function(lua, args)?.push_into_stack_multi(lua)
         }));
         self.meta_methods.push((name.as_ref().into(), func));
     }
@@ -756,8 +927,10 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> for NonStaticUserDataMethods<'l
         A: FromLuaMulti<'lua>,
         R: IntoLuaMulti<'lua>,
     {
-        let func = NonStaticMethod::FunctionMut(Box::new(move |lua, args| {
-            function(lua, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
+        let func_name = format!("{}.{}", short_type_name::<T>(), name.as_ref());
+        let func = NonStaticMethod::FunctionMut(Box::new(move |lua, nargs| unsafe {
+            let args = A::from_stack_args(nargs, 1, Some(&func_name), lua)?;
+            function(lua, args)?.push_into_stack_multi(lua)
         }));
         self.meta_methods.push((name.as_ref().into(), func));
     }
@@ -775,106 +948,3 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> for NonStaticUserDataMethods<'l
         panic!("asynchronous meta functions are not supported for non-static userdata")
     }
 }
-
-struct NonStaticUserDataFields<'lua, T: UserData> {
-    fields: Vec<(String, Callback<'lua, 'static>)>,
-    field_getters: Vec<(String, NonStaticMethod<'lua, T>)>,
-    field_setters: Vec<(String, NonStaticMethod<'lua, T>)>,
-    meta_fields: Vec<(String, Callback<'lua, 'static>)>,
-}
-
-impl<'lua, T: UserData> Default for NonStaticUserDataFields<'lua, T> {
-    fn default() -> NonStaticUserDataFields<'lua, T> {
-        NonStaticUserDataFields {
-            fields: Vec::new(),
-            field_getters: Vec::new(),
-            field_setters: Vec::new(),
-            meta_fields: Vec::new(),
-        }
-    }
-}
-
-impl<'lua, T: UserData> UserDataFields<'lua, T> for NonStaticUserDataFields<'lua, T> {
-    fn add_field<V>(&mut self, name: impl AsRef<str>, value: V)
-    where
-        V: IntoLua<'lua> + Clone + 'static,
-    {
-        let name = name.as_ref().to_string();
-        self.fields.push((
-            name,
-            Box::new(move |lua, _| value.clone().into_lua_multi(lua)),
-        ));
-    }
-
-    fn add_field_method_get<M, R>(&mut self, name: impl AsRef<str>, method: M)
-    where
-        M: Fn(&'lua Lua, &T) -> Result<R> + MaybeSend + 'static,
-        R: IntoLua<'lua>,
-    {
-        let method = NonStaticMethod::Method(Box::new(move |lua, ud, _| {
-            method(lua, ud)?.into_lua_multi(lua)
-        }));
-        self.field_getters.push((name.as_ref().into(), method));
-    }
-
-    fn add_field_method_set<M, A>(&mut self, name: impl AsRef<str>, mut method: M)
-    where
-        M: FnMut(&'lua Lua, &mut T, A) -> Result<()> + MaybeSend + 'static,
-        A: FromLua<'lua>,
-    {
-        let method = NonStaticMethod::MethodMut(Box::new(move |lua, ud, args| {
-            method(lua, ud, A::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
-        }));
-        self.field_setters.push((name.as_ref().into(), method));
-    }
-
-    fn add_field_function_get<F, R>(&mut self, name: impl AsRef<str>, function: F)
-    where
-        F: Fn(&'lua Lua, AnyUserData<'lua>) -> Result<R> + MaybeSend + 'static,
-        R: IntoLua<'lua>,
-    {
-        let func = NonStaticMethod::Function(Box::new(move |lua, args| {
-            function(lua, AnyUserData::from_lua_multi(args, lua)?)?.into_lua_multi(lua)
-        }));
-        self.field_getters.push((name.as_ref().into(), func));
-    }
-
-    fn add_field_function_set<F, A>(&mut self, name: impl AsRef<str>, mut function: F)
-    where
-        F: FnMut(&'lua Lua, AnyUserData<'lua>, A) -> Result<()> + MaybeSend + 'static,
-        A: FromLua<'lua>,
-    {
-        let func = NonStaticMethod::FunctionMut(Box::new(move |lua, args| {
-            let (ud, val) = <_>::from_lua_multi(args, lua)?;
-            function(lua, ud, val)?.into_lua_multi(lua)
-        }));
-        self.field_setters.push((name.as_ref().into(), func));
-    }
-
-    fn add_meta_field<V>(&mut self, name: impl AsRef<str>, value: V)
-    where
-        V: IntoLua<'lua> + Clone + 'static,
-    {
-        let name = name.as_ref().to_string();
-        let name2 = name.clone();
-        self.meta_fields.push((
-            name,
-            Box::new(move |lua, _| {
-                UserDataRegistry::<()>::check_meta_field(lua, &name2, value.clone())
-            }),
-        ));
-    }
-
-    fn add_meta_field_with<F, R>(&mut self, name: impl AsRef<str>, f: F)
-    where
-        F: Fn(&'lua Lua) -> Result<R> + MaybeSend + 'static,
-        R: IntoLua<'lua>,
-    {
-        let name = name.as_ref().to_string();
-        let name2 = name.clone();
-        self.meta_fields.push((
-            name,
-            Box::new(move |lua, _| UserDataRegistry::<()>::check_meta_field(lua, &name2, f(lua)?)),
-        ));
-    }
-}

src/serde/de.rs

@@ -2,6 +2,7 @@ use std::cell::RefCell;
 use std::convert::TryInto;
 use std::os::raw::c_void;
 use std::rc::Rc;
+use std::result::Result as StdResult;
 use std::string::String as StdString;
 
 use rustc_hash::FxHashSet;
@@ -24,14 +25,14 @@ pub struct Deserializer<'lua> {
 #[derive(Debug, Clone, Copy)]
 #[non_exhaustive]
 pub struct Options {
-    /// If true, an attempt to serialize types such as [`Thread`], [`UserData`], [`LightUserData`]
+    /// If true, an attempt to serialize types such as [`Function`], [`Thread`], [`LightUserData`]
     /// and [`Error`] will cause an error.
     /// Otherwise these types skipped when iterating or serialized as unit type.
     ///
     /// Default: **true**
     ///
+    /// [`Function`]: crate::Function
     /// [`Thread`]: crate::Thread
-    /// [`UserData`]: crate::UserData
     /// [`LightUserData`]: crate::LightUserData
     /// [`Error`]: crate::Error
     pub deny_unsupported_types: bool,
@@ -42,6 +43,11 @@ pub struct Options {
     ///
     /// Default: **true**
     pub deny_recursive_tables: bool,
+
+    /// If true, keys in tables will be iterated in sorted order.
+    ///
+    /// Default: **false**
+    pub sort_keys: bool,
 }
 
 impl Default for Options {
@@ -56,6 +62,7 @@ impl Options {
         Options {
             deny_unsupported_types: true,
             deny_recursive_tables: true,
+            sort_keys: false,
         }
     }
 
@@ -76,6 +83,15 @@ impl Options {
         self.deny_recursive_tables = enabled;
         self
     }
+
+    /// Sets [`sort_keys`] option.
+    ///
+    /// [`sort_keys`]: #structfield.sort_keys
+    #[must_use]
+    pub const fn sort_keys(mut self, enabled: bool) -> Self {
+        self.sort_keys = enabled;
+        self
+    }
 }
 
 impl<'lua> Deserializer<'lua> {
@@ -141,10 +157,8 @@ impl<'lua, 'de> serde::Deserializer<'de> for Deserializer<'lua> {
             | Value::LightUserData(_)
             | Value::Error(_) => {
                 if self.options.deny_unsupported_types {
-                    Err(de::Error::custom(format!(
-                        "unsupported value type `{}`",
-                        self.value.type_name()
-                    )))
+                    let msg = format!("unsupported value type `{}`", self.value.type_name());
+                    Err(de::Error::custom(msg))
                 } else {
                     visitor.visit_unit()
                 }
@@ -195,7 +209,9 @@ impl<'lua, 'de> serde::Deserializer<'de> for Deserializer<'lua> {
                         &"map with a single key",
                     ));
                 }
-                if check_value_if_skip(&value, self.options, &self.visited)? {
+                let skip = check_value_for_skip(&value, self.options, &self.visited)
+                    .map_err(|err| Error::DeserializeError(err.to_string()))?;
+                if skip {
                     return Err(de::Error::custom("bad enum value"));
                 }
 
@@ -235,7 +251,7 @@ impl<'lua, 'de> serde::Deserializer<'de> for Deserializer<'lua> {
             Value::Table(t) => {
                 let _guard = RecursionGuard::new(&t, &self.visited);
 
-                let len = t.raw_len() as usize;
+                let len = t.raw_len();
                 let mut deserializer = SeqDeserializer {
                     seq: t.sequence_values(),
                     options: self.options,
@@ -292,7 +308,7 @@ impl<'lua, 'de> serde::Deserializer<'de> for Deserializer<'lua> {
                 let _guard = RecursionGuard::new(&t, &self.visited);
 
                 let mut deserializer = MapDeserializer {
-                    pairs: t.pairs(),
+                    pairs: MapPairs::new(t, self.options.sort_keys)?,
                     value: None,
                     options: self.options,
                     visited: self.visited,
@@ -390,7 +406,9 @@ impl<'lua, 'de> de::SeqAccess<'de> for SeqDeserializer<'lua> {
             match self.seq.next() {
                 Some(value) => {
                     let value = value?;
-                    if check_value_if_skip(&value, self.options, &self.visited)? {
+                    let skip = check_value_for_skip(&value, self.options, &self.visited)
+                        .map_err(|err| Error::DeserializeError(err.to_string()))?;
+                    if skip {
                         continue;
                     }
                     let visited = Rc::clone(&self.visited);
@@ -443,8 +461,50 @@ impl<'de> de::SeqAccess<'de> for VecDeserializer {
     }
 }
 
+pub(crate) enum MapPairs<'lua> {
+    Iter(TablePairs<'lua, Value<'lua>, Value<'lua>>),
+    Vec(Vec<(Value<'lua>, Value<'lua>)>),
+}
+
+impl<'lua> MapPairs<'lua> {
+    pub(crate) fn new(t: Table<'lua>, sort_keys: bool) -> Result<Self> {
+        if sort_keys {
+            let mut pairs = t.pairs::<Value, Value>().collect::<Result<Vec<_>>>()?;
+            pairs.sort_by(|(a, _), (b, _)| b.cmp(a)); // reverse order as we pop values from the end
+            Ok(MapPairs::Vec(pairs))
+        } else {
+            Ok(MapPairs::Iter(t.pairs::<Value, Value>()))
+        }
+    }
+
+    pub(crate) fn count(self) -> usize {
+        match self {
+            MapPairs::Iter(iter) => iter.count(),
+            MapPairs::Vec(vec) => vec.len(),
+        }
+    }
+
+    pub(crate) fn size_hint(&self) -> (usize, Option<usize>) {
+        match self {
+            MapPairs::Iter(iter) => iter.size_hint(),
+            MapPairs::Vec(vec) => (vec.len(), Some(vec.len())),
+        }
+    }
+}
+
+impl<'lua> Iterator for MapPairs<'lua> {
+    type Item = Result<(Value<'lua>, Value<'lua>)>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match self {
+            MapPairs::Iter(iter) => iter.next(),
+            MapPairs::Vec(vec) => vec.pop().map(Ok),
+        }
+    }
+}
+
 struct MapDeserializer<'lua> {
-    pairs: TablePairs<'lua, Value<'lua>, Value<'lua>>,
+    pairs: MapPairs<'lua>,
     value: Option<Value<'lua>>,
     options: Options,
     visited: Rc<RefCell<FxHashSet<*const c_void>>>,
@@ -462,9 +522,11 @@ impl<'lua, 'de> de::MapAccess<'de> for MapDeserializer<'lua> {
             match self.pairs.next() {
                 Some(item) => {
                     let (key, value) = item?;
-                    if check_value_if_skip(&key, self.options, &self.visited)?
-                        || check_value_if_skip(&value, self.options, &self.visited)?
-                    {
+                    let skip_key = check_value_for_skip(&key, self.options, &self.visited)
+                        .map_err(|err| Error::DeserializeError(err.to_string()))?;
+                    let skip_value = check_value_for_skip(&value, self.options, &self.visited)
+                        .map_err(|err| Error::DeserializeError(err.to_string()))?;
+                    if skip_key || skip_value {
                         continue;
                     }
                     self.processed += 1;
@@ -615,17 +677,17 @@ impl Drop for RecursionGuard {
 }
 
 // Checks `options` and decides should we emit an error or skip next element
-fn check_value_if_skip(
+pub(crate) fn check_value_for_skip(
     value: &Value,
     options: Options,
     visited: &RefCell<FxHashSet<*const c_void>>,
-) -> Result<bool> {
+) -> StdResult<bool, &'static str> {
     match value {
         Value::Table(table) => {
             let ptr = table.to_pointer();
             if visited.borrow().contains(&ptr) {
                 if options.deny_recursive_tables {
-                    return Err(de::Error::custom("recursive table detected"));
+                    return Err("recursive table detected");
                 }
                 return Ok(true); // skip
             }

src/stdlib.rs

@@ -16,32 +16,44 @@ impl StdLib {
         feature = "luau"
     ))]
     pub const COROUTINE: StdLib = StdLib(1);
+
     /// [`table`](https://www.lua.org/manual/5.4/manual.html#6.6) library
     pub const TABLE: StdLib = StdLib(1 << 1);
+
     /// [`io`](https://www.lua.org/manual/5.4/manual.html#6.8) library
     #[cfg(not(feature = "luau"))]
     #[cfg_attr(docsrs, doc(cfg(not(feature = "luau"))))]
     pub const IO: StdLib = StdLib(1 << 2);
+
     /// [`os`](https://www.lua.org/manual/5.4/manual.html#6.9) library
     pub const OS: StdLib = StdLib(1 << 3);
+
     /// [`string`](https://www.lua.org/manual/5.4/manual.html#6.4) library
     pub const STRING: StdLib = StdLib(1 << 4);
+
     /// [`utf8`](https://www.lua.org/manual/5.4/manual.html#6.5) library
     ///
     /// Requires `feature = "lua54/lua53/luau"`
     #[cfg(any(feature = "lua54", feature = "lua53", feature = "luau"))]
     pub const UTF8: StdLib = StdLib(1 << 5);
+
     /// [`bit`](https://www.lua.org/manual/5.2/manual.html#6.7) library
     ///
     /// Requires `feature = "lua52/luajit/luau"`
     #[cfg(any(feature = "lua52", feature = "luajit", feature = "luau", doc))]
     pub const BIT: StdLib = StdLib(1 << 6);
+
     /// [`math`](https://www.lua.org/manual/5.4/manual.html#6.7) library
     pub const MATH: StdLib = StdLib(1 << 7);
+
     /// [`package`](https://www.lua.org/manual/5.4/manual.html#6.3) library
-    #[cfg(not(feature = "luau"))]
-    #[cfg_attr(docsrs, doc(cfg(not(feature = "luau"))))]
     pub const PACKAGE: StdLib = StdLib(1 << 8);
+
+    /// [`buffer`](https://luau-lang.org/library#buffer-library) library
+    #[cfg(any(feature = "luau", doc))]
+    #[cfg_attr(docsrs, doc(cfg(feature = "luau")))]
+    pub const BUFFER: StdLib = StdLib(1 << 9);
+
     /// [`jit`](http://luajit.org/ext_jit.html) library
     ///
     /// Requires `feature = "luajit"`
@@ -55,6 +67,7 @@ impl StdLib {
     #[cfg(any(feature = "luajit", doc))]
     #[cfg_attr(docsrs, doc(cfg(feature = "luajit")))]
     pub const FFI: StdLib = StdLib(1 << 30);
+
     /// (**unsafe**) [`debug`](https://www.lua.org/manual/5.4/manual.html#6.10) library
     pub const DEBUG: StdLib = StdLib(1 << 31);
 

src/table.rs

@@ -6,8 +6,8 @@ use std::os::raw::c_void;
 #[cfg(feature = "serialize")]
 use {
     rustc_hash::FxHashSet,
-    serde::ser::{self, Serialize, SerializeMap, SerializeSeq, Serializer},
-    std::{cell::RefCell, result::Result as StdResult},
+    serde::ser::{Serialize, SerializeMap, SerializeSeq, Serializer},
+    std::{cell::RefCell, rc::Rc, result::Result as StdResult},
 };
 
 use crate::error::{Error, Result};
@@ -86,17 +86,14 @@ impl<'lua> Table<'lua> {
         }
 
         let lua = self.0.lua;
-        let key = key.into_lua(lua)?;
-        let value = value.into_lua(lua)?;
-
         let state = lua.state();
         unsafe {
             let _sg = StackGuard::new(state);
             check_stack(state, 5)?;
 
             lua.push_ref(&self.0);
-            lua.push_value(key)?;
-            lua.push_value(value)?;
+            key.push_into_stack(lua)?;
+            value.push_into_stack(lua)?;
             protect_lua!(state, 3, 0, fn(state) ffi::lua_settable(state, -3))
         }
     }
@@ -133,19 +130,16 @@ impl<'lua> Table<'lua> {
 
         let lua = self.0.lua;
         let state = lua.state();
-        let key = key.into_lua(lua)?;
-
-        let value = unsafe {
+        unsafe {
             let _sg = StackGuard::new(state);
             check_stack(state, 4)?;
 
             lua.push_ref(&self.0);
-            lua.push_value(key)?;
+            key.push_into_stack(lua)?;
             protect_lua!(state, 2, 1, fn(state) ffi::lua_gettable(state, -2))?;
 
-            lua.pop_value()
-        };
-        V::from_lua(value, lua)
+            V::from_stack(-1, lua)
+        }
     }
 
     /// Checks whether the table contains a non-nil value for `key`.
@@ -166,13 +160,12 @@ impl<'lua> Table<'lua> {
 
         let lua = self.0.lua;
         let state = lua.state();
-        let value = value.into_lua(lua)?;
         unsafe {
             let _sg = StackGuard::new(state);
             check_stack(state, 4)?;
 
             lua.push_ref(&self.0);
-            lua.push_value(value)?;
+            value.push_into_stack(lua)?;
             protect_lua!(state, 2, 0, fn(state) {
                 let len = ffi::luaL_len(state, -2) as Integer;
                 ffi::lua_seti(state, -2, len + 1);
@@ -192,7 +185,7 @@ impl<'lua> Table<'lua> {
 
         let lua = self.0.lua;
         let state = lua.state();
-        let value = unsafe {
+        unsafe {
             let _sg = StackGuard::new(state);
             check_stack(state, 4)?;
 
@@ -203,9 +196,8 @@ impl<'lua> Table<'lua> {
                 ffi::lua_pushnil(state);
                 ffi::lua_seti(state, -3, len);
             })?;
-            lua.pop_value()
-        };
-        V::from_lua(value, lua)
+            V::from_stack(-1, lua)
+        }
     }
 
     /// Compares two tables for equality.
@@ -271,16 +263,13 @@ impl<'lua> Table<'lua> {
 
         let lua = self.0.lua;
         let state = lua.state();
-        let key = key.into_lua(lua)?;
-        let value = value.into_lua(lua)?;
-
         unsafe {
             let _sg = StackGuard::new(state);
             check_stack(state, 5)?;
 
             lua.push_ref(&self.0);
-            lua.push_value(key)?;
-            lua.push_value(value)?;
+            key.push_into_stack(lua)?;
+            value.push_into_stack(lua)?;
 
             if lua.unlikely_memory_error() {
                 ffi::lua_rawset(state, -3);
@@ -296,39 +285,34 @@ impl<'lua> Table<'lua> {
     pub fn raw_get<K: IntoLua<'lua>, V: FromLua<'lua>>(&self, key: K) -> Result<V> {
         let lua = self.0.lua;
         let state = lua.state();
-        let key = key.into_lua(lua)?;
-
-        let value = unsafe {
+        unsafe {
             let _sg = StackGuard::new(state);
             check_stack(state, 3)?;
 
             lua.push_ref(&self.0);
-            lua.push_value(key)?;
+            key.push_into_stack(lua)?;
             ffi::lua_rawget(state, -2);
 
-            lua.pop_value()
-        };
-        V::from_lua(value, lua)
+            V::from_stack(-1, lua)
+        }
     }
 
     /// Inserts element value at position `idx` to the table, shifting up the elements from `table[idx]`.
     /// The worst case complexity is O(n), where n is the table length.
     pub fn raw_insert<V: IntoLua<'lua>>(&self, idx: Integer, value: V) -> Result<()> {
-        let lua = self.0.lua;
-        let state = lua.state();
-
-        let size = self.raw_len();
+        let size = self.raw_len() as Integer;
         if idx < 1 || idx > size + 1 {
             return Err(Error::runtime("index out of bounds"));
         }
 
-        let value = value.into_lua(lua)?;
+        let lua = self.0.lua;
+        let state = lua.state();
         unsafe {
             let _sg = StackGuard::new(state);
             check_stack(state, 5)?;
 
             lua.push_ref(&self.0);
-            lua.push_value(value)?;
+            value.push_into_stack(lua)?;
             protect_lua!(state, 2, 0, |state| {
                 for i in (idx..=size).rev() {
                     // table[i+1] = table[i]
@@ -347,14 +331,12 @@ impl<'lua> Table<'lua> {
 
         let lua = self.0.lua;
         let state = lua.state();
-        let value = value.into_lua(lua)?;
-
         unsafe {
             let _sg = StackGuard::new(state);
             check_stack(state, 4)?;
 
             lua.push_ref(&self.0);
-            lua.push_value(value)?;
+            value.push_into_stack(lua)?;
 
             unsafe fn callback(state: *mut ffi::lua_State) {
                 let len = ffi::lua_rawlen(state, -2) as Integer;
@@ -377,7 +359,7 @@ impl<'lua> Table<'lua> {
 
         let lua = self.0.lua;
         let state = lua.state();
-        let value = unsafe {
+        unsafe {
             let _sg = StackGuard::new(state);
             check_stack(state, 3)?;
 
@@ -387,9 +369,9 @@ impl<'lua> Table<'lua> {
             // Set slot to nil (it must be safe to do)
             ffi::lua_pushnil(state);
             ffi::lua_rawseti(state, -3, len);
-            lua.pop_value()
-        };
-        V::from_lua(value, lua)
+
+            V::from_stack(-1, lua)
+        }
     }
 
     /// Removes a key from the table.
@@ -405,7 +387,7 @@ impl<'lua> Table<'lua> {
         let key = key.into_lua(lua)?;
         match key {
             Value::Integer(idx) => {
-                let size = self.raw_len();
+                let size = self.raw_len() as Integer;
                 if idx < 1 || idx > size {
                     return Err(Error::runtime("index out of bounds"));
                 }
@@ -477,7 +459,7 @@ impl<'lua> Table<'lua> {
     pub fn len(&self) -> Result<Integer> {
         // Fast track
         if !self.has_metatable() {
-            return Ok(self.raw_len());
+            return Ok(self.raw_len() as Integer);
         }
 
         let lua = self.0.lua;
@@ -492,9 +474,9 @@ impl<'lua> Table<'lua> {
     }
 
     /// Returns the result of the Lua `#` operator, without invoking the `__len` metamethod.
-    pub fn raw_len(&self) -> Integer {
+    pub fn raw_len(&self) -> usize {
         let ref_thread = self.0.lua.ref_thread();
-        unsafe { ffi::lua_rawlen(ref_thread, self.0.index) as Integer }
+        unsafe { ffi::lua_rawlen(ref_thread, self.0.index) }
     }
 
     /// Returns `true` if the table is empty, without invoking metamethods.
@@ -669,6 +651,34 @@ impl<'lua> Table<'lua> {
         }
     }
 
+    /// Iterates over the pairs of the table, invoking the given closure on each pair.
+    ///
+    /// This method is similar to [`Table::pairs`], but optimized for performance.
+    /// It does not invoke the `__pairs` metamethod.
+    pub fn for_each<K, V>(&self, mut f: impl FnMut(K, V) -> Result<()>) -> Result<()>
+    where
+        K: FromLua<'lua>,
+        V: FromLua<'lua>,
+    {
+        let lua = self.0.lua;
+        let state = lua.state();
+        unsafe {
+            let _sg = StackGuard::new(state);
+            check_stack(state, 5)?;
+
+            lua.push_ref(&self.0);
+            ffi::lua_pushnil(state);
+            while ffi::lua_next(state, -2) != 0 {
+                let k = K::from_stack(-2, lua)?;
+                let v = V::from_stack(-1, lua)?;
+                f(k, v)?;
+                // Keep key for next iteration
+                ffi::lua_pop(state, 1);
+            }
+        }
+        Ok(())
+    }
+
     /// Consume this table and return an iterator over all values in the sequence part of the table.
     ///
     /// The iterator will yield all values `t[1]`, `t[2]` and so on, until a `nil` value is
@@ -710,7 +720,7 @@ impl<'lua> Table<'lua> {
     pub fn sequence_values<V: FromLua<'lua>>(self) -> TableSequence<'lua, V> {
         TableSequence {
             table: self.0,
-            index: Some(1),
+            index: 1,
             len: None,
             _phantom: PhantomData,
         }
@@ -725,33 +735,31 @@ impl<'lua> Table<'lua> {
     #[cfg(feature = "serialize")]
     pub(crate) fn sequence_values_by_len<V: FromLua<'lua>>(
         self,
-        len: Option<Integer>,
+        len: Option<usize>,
     ) -> TableSequence<'lua, V> {
-        let len = len.unwrap_or_else(|| self.raw_len());
+        let len = len.unwrap_or_else(|| self.raw_len()) as Integer;
         TableSequence {
             table: self.0,
-            index: Some(1),
+            index: 1,
             len: Some(len),
             _phantom: PhantomData,
         }
     }
 
     /// Sets element value at position `idx` without invoking metamethods.
-    #[allow(dead_code)]
-    pub(crate) fn raw_seti<V: IntoLua<'lua>>(&self, idx: usize, value: V) -> Result<()> {
+    #[doc(hidden)]
+    pub fn raw_seti<V: IntoLua<'lua>>(&self, idx: usize, value: V) -> Result<()> {
         #[cfg(feature = "luau")]
         self.check_readonly_write()?;
 
         let lua = self.0.lua;
         let state = lua.state();
-        let value = value.into_lua(lua)?;
-
         unsafe {
             let _sg = StackGuard::new(state);
             check_stack(state, 5)?;
 
             lua.push_ref(&self.0);
-            lua.push_value(value)?;
+            value.push_into_stack(lua)?;
 
             let idx = idx.try_into().unwrap();
             if lua.unlikely_memory_error() {
@@ -759,8 +767,8 @@ impl<'lua> Table<'lua> {
             } else {
                 protect_lua!(state, 2, 0, |state| ffi::lua_rawseti(state, -2, idx))?;
             }
-            Ok(())
         }
+        Ok(())
     }
 
     #[cfg(feature = "serialize")]
@@ -1036,47 +1044,113 @@ impl<'lua> TableExt<'lua> for Table<'lua> {
     }
 }
 
+/// A wrapped [`Table`] with customized serialization behavior.
+#[cfg(feature = "serialize")]
+pub(crate) struct SerializableTable<'a, 'lua> {
+    table: &'a Table<'lua>,
+    options: crate::serde::de::Options,
+    visited: Rc<RefCell<FxHashSet<*const c_void>>>,
+}
+
 #[cfg(feature = "serialize")]
 impl<'lua> Serialize for Table<'lua> {
+    #[inline]
+    fn serialize<S: Serializer>(&self, serializer: S) -> StdResult<S::Ok, S::Error> {
+        SerializableTable::new(self, Default::default(), Default::default()).serialize(serializer)
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl<'a, 'lua> SerializableTable<'a, 'lua> {
+    #[inline]
+    pub(crate) fn new(
+        table: &'a Table<'lua>,
+        options: crate::serde::de::Options,
+        visited: Rc<RefCell<FxHashSet<*const c_void>>>,
+    ) -> Self {
+        Self {
+            table,
+            options,
+            visited,
+        }
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl<'a, 'lua> Serialize for SerializableTable<'a, 'lua> {
     fn serialize<S>(&self, serializer: S) -> StdResult<S::Ok, S::Error>
     where
         S: Serializer,
     {
-        thread_local! {
-            static VISITED: RefCell<FxHashSet<*const c_void>> = RefCell::new(FxHashSet::default());
+        use crate::serde::de::{check_value_for_skip, MapPairs};
+        use crate::value::SerializableValue;
+
+        let options = self.options;
+        let visited = &self.visited;
+        visited.borrow_mut().insert(self.table.to_pointer());
+
+        // Array
+        let len = self.table.raw_len();
+        if len > 0 || self.table.is_array() {
+            let mut seq = serializer.serialize_seq(Some(len))?;
+            for value in self.table.clone().sequence_values_by_len::<Value>(None) {
+                let value = &value.map_err(serde::ser::Error::custom)?;
+                let skip = check_value_for_skip(value, self.options, &self.visited)
+                    .map_err(serde::ser::Error::custom)?;
+                if skip {
+                    continue;
+                }
+                seq.serialize_element(&SerializableValue::new(value, options, Some(visited)))?;
+            }
+            return seq.end();
         }
 
-        let ptr = self.to_pointer();
-        let res = VISITED.with(|visited| {
-            {
-                let mut visited = visited.borrow_mut();
-                if visited.contains(&ptr) {
-                    return Err(ser::Error::custom("recursive table detected"));
-                }
-                visited.insert(ptr);
+        // HashMap
+        let mut map = serializer.serialize_map(None)?;
+        let mut serialize_err = None;
+        let mut process_pair = |key, value| {
+            let skip_key = check_value_for_skip(&key, self.options, &self.visited)
+                .map_err(|err| Error::SerializeError(err.to_string()))?;
+            let skip_value = check_value_for_skip(&value, self.options, &self.visited)
+                .map_err(|err| Error::SerializeError(err.to_string()))?;
+            if skip_key || skip_value {
+                // continue iteration
+                return Ok(());
             }
+            map.serialize_entry(
+                &SerializableValue::new(&key, options, Some(visited)),
+                &SerializableValue::new(&value, options, Some(visited)),
+            )
+            .map_err(|err| {
+                serialize_err = Some(err);
+                Error::SerializeError(String::new())
+            })
+        };
 
-            let len = self.raw_len() as usize;
-            if len > 0 || self.is_array() {
-                let mut seq = serializer.serialize_seq(Some(len))?;
-                for v in self.clone().sequence_values_by_len::<Value>(None) {
-                    let v = v.map_err(serde::ser::Error::custom)?;
-                    seq.serialize_element(&v)?;
-                }
-                return seq.end();
+        let res = if !self.options.sort_keys {
+            // Fast track
+            self.table.for_each(process_pair)
+        } else {
+            MapPairs::new(self.table.clone(), self.options.sort_keys)
+                .map_err(serde::ser::Error::custom)?
+                .try_for_each(|kv| {
+                    let (key, value) = kv?;
+                    process_pair(key, value)
+                })
+        };
+        match res {
+            Ok(_) => {}
+            Err(Error::SerializeError(_)) if serialize_err.is_some() => {
+                return Err(serialize_err.unwrap());
             }
-
-            let mut map = serializer.serialize_map(None)?;
-            for kv in self.clone().pairs::<Value, Value>() {
-                let (k, v) = kv.map_err(serde::ser::Error::custom)?;
-                map.serialize_entry(&k, &v)?;
+            Err(Error::SerializeError(msg)) => {
+                return Err(serde::ser::Error::custom(msg));
             }
-            map.end()
-        });
-        VISITED.with(|visited| {
-            visited.borrow_mut().remove(&ptr);
-        });
-        res
+            Err(err) => {
+                return Err(serde::ser::Error::custom(err.to_string()));
+            }
+        }
+        map.end()
     }
 }
 
@@ -1110,16 +1184,15 @@ where
                 lua.push_ref(&self.table);
                 lua.push_value(prev_key)?;
 
-                let next = protect_lua!(state, 2, ffi::LUA_MULTRET, |state| {
-                    ffi::lua_next(state, -2)
-                })?;
-                if next != 0 {
-                    let value = lua.pop_value();
-                    let key = lua.pop_value();
+                // It must be safe to call `lua_next` unprotected as deleting a key from a table is
+                // a permitted operation.
+                // It fails only if the key is not found (never existed) which seems impossible scenario.
+                if ffi::lua_next(state, -2) != 0 {
+                    let key = lua.stack_value(-2);
                     Ok(Some((
                         key.clone(),
                         K::from_lua(key, lua)?,
-                        V::from_lua(value, lua)?,
+                        V::from_stack(-1, lua)?,
                     )))
                 } else {
                     Ok(None)
@@ -1147,7 +1220,7 @@ where
 /// [`Table::sequence_values`]: crate::Table::sequence_values
 pub struct TableSequence<'lua, V> {
     table: LuaRef<'lua>,
-    index: Option<Integer>,
+    index: Integer,
     len: Option<Integer>,
     _phantom: PhantomData<V>,
 }
@@ -1159,31 +1232,22 @@ where
     type Item = Result<V>;
 
     fn next(&mut self) -> Option<Self::Item> {
-        if let Some(index) = self.index.take() {
-            let lua = self.table.lua;
-            let state = lua.state();
-
-            let res = (|| unsafe {
-                let _sg = StackGuard::new(state);
-                check_stack(state, 1)?;
-
-                lua.push_ref(&self.table);
-                match ffi::lua_rawgeti(state, -1, index) {
-                    ffi::LUA_TNIL if index > self.len.unwrap_or(0) => Ok(None),
-                    _ => Ok(Some((index, lua.pop_value()))),
-                }
-            })();
-
-            match res {
-                Ok(Some((index, r))) => {
-                    self.index = Some(index + 1);
-                    Some(V::from_lua(r, lua))
-                }
-                Ok(None) => None,
-                Err(err) => Some(Err(err)),
+        let lua = self.table.lua;
+        let state = lua.state();
+        unsafe {
+            let _sg = StackGuard::new(state);
+            if let Err(err) = check_stack(state, 1) {
+                return Some(Err(err));
+            }
+
+            lua.push_ref(&self.table);
+            match ffi::lua_rawgeti(state, -1, self.index) {
+                ffi::LUA_TNIL if self.index > self.len.unwrap_or(0) => None,
+                _ => {
+                    self.index += 1;
+                    Some(V::from_stack(-1, lua))
+                }
             }
-        } else {
-            None
         }
     }
 }

src/thread.rs

@@ -1,4 +1,3 @@
-use std::cmp;
 use std::os::raw::c_int;
 
 use crate::error::{Error, Result};
@@ -16,10 +15,7 @@ use crate::{
 
 #[cfg(feature = "async")]
 use {
-    crate::{
-        lua::ASYNC_POLL_PENDING,
-        value::{MultiValue, Value},
-    },
+    crate::{lua::ASYNC_POLL_PENDING, value::MultiValue},
     futures_util::stream::Stream,
     std::{
         future::Future,
@@ -30,7 +26,7 @@ use {
     },
 };
 
-/// Status of a Lua thread (or coroutine).
+/// Status of a Lua thread (coroutine).
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub enum ThreadStatus {
     /// The thread was just created, or is suspended because it has called `coroutine.yield`.
@@ -45,9 +41,33 @@ pub enum ThreadStatus {
     Error,
 }
 
-/// Handle to an internal Lua thread (or coroutine).
+/// Handle to an internal Lua thread (coroutine).
 #[derive(Clone, Debug)]
-pub struct Thread<'lua>(pub(crate) LuaRef<'lua>);
+pub struct Thread<'lua>(pub(crate) LuaRef<'lua>, pub(crate) *mut ffi::lua_State);
+
+/// Owned handle to an internal Lua thread (coroutine).
+///
+/// The owned handle holds a *strong* reference to the current Lua instance.
+/// Be warned, if you place it into a Lua type (eg. [`UserData`] or a Rust callback), it is *very easy*
+/// to accidentally cause reference cycles that would prevent destroying Lua instance.
+///
+/// [`UserData`]: crate::UserData
+#[cfg(feature = "unstable")]
+#[cfg_attr(docsrs, doc(cfg(feature = "unstable")))]
+#[derive(Clone, Debug)]
+pub struct OwnedThread(
+    pub(crate) crate::types::LuaOwnedRef,
+    pub(crate) *mut ffi::lua_State,
+);
+
+#[cfg(feature = "unstable")]
+impl OwnedThread {
+    /// Get borrowed handle to the underlying Lua table.
+    #[cfg_attr(feature = "send", allow(unused))]
+    pub const fn to_ref(&self) -> Thread {
+        Thread(self.0.to_ref(), self.1)
+    }
+}
 
 /// Thread (coroutine) representation as an async [`Future`] or [`Stream`].
 ///
@@ -66,6 +86,16 @@ pub struct AsyncThread<'lua, R> {
 }
 
 impl<'lua> Thread<'lua> {
+    #[inline(always)]
+    pub(crate) fn new(r#ref: LuaRef<'lua>) -> Self {
+        let state = unsafe { ffi::lua_tothread(r#ref.lua.ref_thread(), r#ref.index) };
+        Thread(r#ref, state)
+    }
+
+    const fn state(&self) -> *mut ffi::lua_State {
+        self.1
+    }
+
     /// Resumes execution of this thread.
     ///
     /// Equivalent to `coroutine.resume`.
@@ -114,60 +144,59 @@ impl<'lua> Thread<'lua> {
     {
         let lua = self.0.lua;
         let state = lua.state();
-
-        let mut args = args.into_lua_multi(lua)?;
-        let nargs = args.len() as c_int;
-        let results = unsafe {
+        let thread_state = self.state();
+        unsafe {
             let _sg = StackGuard::new(state);
-            check_stack(state, cmp::max(nargs + 1, 3))?;
+            let _thread_sg = StackGuard::with_top(thread_state, 0);
 
-            let thread_state = ffi::lua_tothread(lua.ref_thread(), self.0.index);
-
-            let status = ffi::lua_status(thread_state);
-            if status != ffi::LUA_YIELD && ffi::lua_gettop(thread_state) == 0 {
-                return Err(Error::CoroutineInactive);
-            }
-
-            check_stack(thread_state, nargs)?;
-            for arg in args.drain_all() {
-                lua.push_value(arg)?;
-            }
-            ffi::lua_xmove(state, thread_state, nargs);
-
-            let mut nresults = 0;
-
-            let ret = ffi::lua_resume(thread_state, state, nargs, &mut nresults as *mut c_int);
-            if ret != ffi::LUA_OK && ret != ffi::LUA_YIELD {
-                if ret == ffi::LUA_ERRMEM {
-                    // Don't call error handler for memory errors
-                    return Err(pop_error(thread_state, ret));
-                }
-                check_stack(state, 3)?;
-                protect_lua!(state, 0, 1, |state| error_traceback_thread(
-                    state,
-                    thread_state
-                ))?;
-                return Err(pop_error(state, ret));
-            }
-
-            let mut results = args; // Reuse MultiValue container
-            check_stack(state, nresults + 2)?; // 2 is extra for `lua.pop_value()` below
+            let nresults = self.resume_inner(args)?;
+            check_stack(state, nresults + 1)?;
             ffi::lua_xmove(thread_state, state, nresults);
 
-            for _ in 0..nresults {
-                results.push_front(lua.pop_value());
+            R::from_stack_multi(nresults, lua)
+        }
+    }
+
+    /// Resumes execution of this thread.
+    ///
+    /// It's similar to `resume()` but leaves `nresults` values on the thread stack.
+    unsafe fn resume_inner<A: IntoLuaMulti<'lua>>(&self, args: A) -> Result<c_int> {
+        let lua = self.0.lua;
+        let state = lua.state();
+        let thread_state = self.state();
+
+        if self.status() != ThreadStatus::Resumable {
+            return Err(Error::CoroutineInactive);
+        }
+
+        let nargs = args.push_into_stack_multi(lua)?;
+        if nargs > 0 {
+            check_stack(thread_state, nargs)?;
+            ffi::lua_xmove(state, thread_state, nargs);
+        }
+
+        let mut nresults = 0;
+        let ret = ffi::lua_resume(thread_state, state, nargs, &mut nresults as *mut c_int);
+        if ret != ffi::LUA_OK && ret != ffi::LUA_YIELD {
+            if ret == ffi::LUA_ERRMEM {
+                // Don't call error handler for memory errors
+                return Err(pop_error(thread_state, ret));
             }
-            results
-        };
-        R::from_lua_multi(results, lua)
+            check_stack(state, 3)?;
+            protect_lua!(state, 0, 1, |state| error_traceback_thread(
+                state,
+                thread_state
+            ))?;
+            return Err(pop_error(state, ret));
+        }
+
+        Ok(nresults)
     }
 
     /// Gets the status of the thread.
     pub fn status(&self) -> ThreadStatus {
-        let lua = self.0.lua;
+        let thread_state = self.state();
         unsafe {
-            let thread_state = ffi::lua_tothread(lua.ref_thread(), self.0.index);
-
             let status = ffi::lua_status(thread_state);
             if status != ffi::LUA_OK && status != ffi::LUA_YIELD {
                 ThreadStatus::Error
@@ -191,8 +220,7 @@ impl<'lua> Thread<'lua> {
     {
         let lua = self.0.lua;
         unsafe {
-            let thread_state = ffi::lua_tothread(lua.ref_thread(), self.0.index);
-            lua.set_thread_hook(thread_state, triggers, callback);
+            lua.set_thread_hook(self.state(), triggers, callback);
         }
     }
 
@@ -202,45 +230,33 @@ impl<'lua> Thread<'lua> {
     /// Returns a error in case of either the original error that stopped the thread or errors
     /// in closing methods.
     ///
-    /// In [LuaJIT] and Luau: resets to the initial state of a newly created Lua thread.
+    /// In Luau: resets to the initial state of a newly created Lua thread.
     /// Lua threads in arbitrary states (like yielded or errored) can be reset properly.
     ///
     /// Sets a Lua function for the thread afterwards.
     ///
-    /// Requires `feature = "lua54"` OR `feature = "luajit,vendored"` OR `feature = "luau"`
+    /// Requires `feature = "lua54"` OR `feature = "luau"`.
     ///
-    /// [Lua 5.4]: https://www.lua.org/manual/5.4/manual.html#lua_resetthread
-    /// [LuaJIT]: https://github.com/openresty/luajit2#lua_resetthread
-    #[cfg(any(
-        feature = "lua54",
-        all(feature = "luajit", feature = "vendored"),
-        feature = "luau",
-    ))]
+    /// [Lua 5.4]: https://www.lua.org/manual/5.4/manual.html#lua_closethread
+    #[cfg(any(feature = "lua54", feature = "luau"))]
+    #[cfg_attr(docsrs, doc(cfg(not(feature = "luau"))))]
     pub fn reset(&self, func: crate::function::Function<'lua>) -> Result<()> {
         let lua = self.0.lua;
-        let state = lua.state();
+        let thread_state = self.state();
         unsafe {
-            let _sg = StackGuard::new(state);
-            check_stack(state, 2)?;
-
-            lua.push_ref(&self.0);
-            let thread_state = ffi::lua_tothread(state, -1);
-
             #[cfg(all(feature = "lua54", not(feature = "vendored")))]
             let status = ffi::lua_resetthread(thread_state);
             #[cfg(all(feature = "lua54", feature = "vendored"))]
-            let status = ffi::lua_closethread(thread_state, state);
+            let status = ffi::lua_closethread(thread_state, lua.state());
             #[cfg(feature = "lua54")]
             if status != ffi::LUA_OK {
                 return Err(pop_error(thread_state, status));
             }
-            #[cfg(all(feature = "luajit", feature = "vendored"))]
-            ffi::lua_resetthread(state, thread_state);
             #[cfg(feature = "luau")]
             ffi::lua_resetthread(thread_state);
 
-            lua.push_ref(&func.0);
-            ffi::lua_xmove(state, thread_state, 1);
+            // Push function to the top of the thread stack
+            ffi::lua_xpush(lua.ref_thread(), thread_state, func.0.index);
 
             #[cfg(feature = "luau")]
             {
@@ -351,13 +367,21 @@ impl<'lua> Thread<'lua> {
     pub fn sandbox(&self) -> Result<()> {
         let lua = self.0.lua;
         let state = lua.state();
+        let thread_state = self.state();
         unsafe {
-            let thread = ffi::lua_tothread(lua.ref_thread(), self.0.index);
-            check_stack(thread, 3)?;
+            check_stack(thread_state, 3)?;
             check_stack(state, 3)?;
-            protect_lua!(state, 0, 0, |_| ffi::luaL_sandboxthread(thread))
+            protect_lua!(state, 0, 0, |_| ffi::luaL_sandboxthread(thread_state))
         }
     }
+
+    /// Convert this handle to owned version.
+    #[cfg(all(feature = "unstable", any(not(feature = "send"), doc)))]
+    #[cfg_attr(docsrs, doc(cfg(all(feature = "unstable", not(feature = "send")))))]
+    #[inline]
+    pub fn into_owned(self) -> OwnedThread {
+        OwnedThread(self.0.into_owned(), self.1)
+    }
 }
 
 impl<'lua> PartialEq for Thread<'lua> {
@@ -366,6 +390,26 @@ impl<'lua> PartialEq for Thread<'lua> {
     }
 }
 
+// Additional shortcuts
+#[cfg(feature = "unstable")]
+impl OwnedThread {
+    /// Resumes execution of this thread.
+    ///
+    /// See [`Thread::resume()`] for more details.
+    pub fn resume<'lua, A, R>(&'lua self, args: A) -> Result<R>
+    where
+        A: IntoLuaMulti<'lua>,
+        R: FromLuaMulti<'lua>,
+    {
+        self.to_ref().resume(args)
+    }
+
+    /// Gets the status of the thread.
+    pub fn status(&self) -> ThreadStatus {
+        self.to_ref().status()
+    }
+}
+
 #[cfg(feature = "async")]
 impl<'lua, R> AsyncThread<'lua, R> {
     #[inline]
@@ -375,11 +419,7 @@ impl<'lua, R> AsyncThread<'lua, R> {
 }
 
 #[cfg(feature = "async")]
-#[cfg(any(
-    feature = "lua54",
-    all(feature = "luajit", feature = "vendored"),
-    feature = "luau",
-))]
+#[cfg(any(feature = "lua54", feature = "luau"))]
 impl<'lua, R> Drop for AsyncThread<'lua, R> {
     fn drop(&mut self) {
         if self.recycle {
@@ -389,11 +429,10 @@ impl<'lua, R> Drop for AsyncThread<'lua, R> {
                 if !lua.recycle_thread(&mut self.thread) {
                     #[cfg(feature = "lua54")]
                     if self.thread.status() == ThreadStatus::Error {
-                        let thread_state = ffi::lua_tothread(lua.ref_thread(), self.thread.0.index);
                         #[cfg(not(feature = "vendored"))]
-                        ffi::lua_resetthread(thread_state);
+                        ffi::lua_resetthread(self.thread.state());
                         #[cfg(feature = "vendored")]
-                        ffi::lua_closethread(thread_state, lua.state());
+                        ffi::lua_closethread(self.thread.state(), lua.state());
                     }
                 }
             }
@@ -409,29 +448,36 @@ where
     type Item = Result<R>;
 
     fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
-        let lua = self.thread.0.lua;
-
-        match self.thread.status() {
-            ThreadStatus::Resumable => {}
-            _ => return Poll::Ready(None),
-        };
-
-        let _wg = WakerGuard::new(lua, cx.waker());
-
-        // This is safe as we are not moving the whole struct
-        let this = unsafe { self.get_unchecked_mut() };
-        let ret: MultiValue = if let Some(args) = this.init_args.take() {
-            this.thread.resume(args?)?
-        } else {
-            this.thread.resume(())?
-        };
-
-        if is_poll_pending(&ret) {
-            return Poll::Pending;
+        if self.thread.status() != ThreadStatus::Resumable {
+            return Poll::Ready(None);
         }
 
-        cx.waker().wake_by_ref();
-        Poll::Ready(Some(R::from_lua_multi(ret, lua)))
+        let lua = self.thread.0.lua;
+        let state = lua.state();
+        let thread_state = self.thread.state();
+        unsafe {
+            let _sg = StackGuard::new(state);
+            let _thread_sg = StackGuard::with_top(thread_state, 0);
+            let _wg = WakerGuard::new(lua, cx.waker());
+
+            // This is safe as we are not moving the whole struct
+            let this = self.get_unchecked_mut();
+            let nresults = if let Some(args) = this.init_args.take() {
+                this.thread.resume_inner(args?)?
+            } else {
+                this.thread.resume_inner(())?
+            };
+
+            if nresults == 1 && is_poll_pending(thread_state) {
+                return Poll::Pending;
+            }
+
+            check_stack(state, nresults + 1)?;
+            ffi::lua_xmove(thread_state, state, nresults);
+
+            cx.waker().wake_by_ref();
+            Poll::Ready(Some(R::from_stack_multi(nresults, lua)))
+        }
     }
 }
 
@@ -443,46 +489,53 @@ where
     type Output = Result<R>;
 
     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        if self.thread.status() != ThreadStatus::Resumable {
+            return Poll::Ready(Err(Error::CoroutineInactive));
+        }
+
         let lua = self.thread.0.lua;
+        let state = lua.state();
+        let thread_state = self.thread.state();
+        unsafe {
+            let _sg = StackGuard::new(state);
+            let _thread_sg = StackGuard::with_top(thread_state, 0);
+            let _wg = WakerGuard::new(lua, cx.waker());
 
-        match self.thread.status() {
-            ThreadStatus::Resumable => {}
-            _ => return Poll::Ready(Err(Error::CoroutineInactive)),
-        };
+            // This is safe as we are not moving the whole struct
+            let this = self.get_unchecked_mut();
+            let nresults = if let Some(args) = this.init_args.take() {
+                this.thread.resume_inner(args?)?
+            } else {
+                this.thread.resume_inner(())?
+            };
 
-        let _wg = WakerGuard::new(lua, cx.waker());
+            if nresults == 1 && is_poll_pending(thread_state) {
+                return Poll::Pending;
+            }
 
-        // This is safe as we are not moving the whole struct
-        let this = unsafe { self.get_unchecked_mut() };
-        let ret: MultiValue = if let Some(args) = this.init_args.take() {
-            this.thread.resume(args?)?
-        } else {
-            this.thread.resume(())?
-        };
+            if ffi::lua_status(thread_state) == ffi::LUA_YIELD {
+                // Ignore value returned via yield()
+                cx.waker().wake_by_ref();
+                return Poll::Pending;
+            }
 
-        if is_poll_pending(&ret) {
-            return Poll::Pending;
+            check_stack(state, nresults + 1)?;
+            ffi::lua_xmove(thread_state, state, nresults);
+
+            Poll::Ready(R::from_stack_multi(nresults, lua))
         }
-
-        if let ThreadStatus::Resumable = this.thread.status() {
-            // Ignore value returned via yield()
-            cx.waker().wake_by_ref();
-            return Poll::Pending;
-        }
-
-        Poll::Ready(R::from_lua_multi(ret, lua))
     }
 }
 
 #[cfg(feature = "async")]
 #[inline(always)]
-fn is_poll_pending(val: &MultiValue) -> bool {
-    match val.iter().enumerate().last() {
-        Some((0, Value::LightUserData(ud))) => {
-            std::ptr::eq(ud.0 as *const u8, &ASYNC_POLL_PENDING as *const u8)
-        }
-        _ => false,
+unsafe fn is_poll_pending(state: *mut ffi::lua_State) -> bool {
+    if ffi::lua_islightuserdata(state, -1) != 0 {
+        let stack_ptr = ffi::lua_touserdata(state, -1) as *const u8;
+        let pending_ptr = &ASYNC_POLL_PENDING as *const u8;
+        return std::ptr::eq(stack_ptr, pending_ptr);
     }
+    false
 }
 
 #[cfg(feature = "async")]
@@ -496,23 +549,19 @@ struct WakerGuard<'lua, 'a> {
 impl<'lua, 'a> WakerGuard<'lua, 'a> {
     #[inline]
     pub fn new(lua: &'lua Lua, waker: &'a Waker) -> Result<WakerGuard<'lua, 'a>> {
-        unsafe {
-            let prev = lua.set_waker(NonNull::from(waker));
-            Ok(WakerGuard {
-                lua,
-                prev,
-                _phantom: PhantomData,
-            })
-        }
+        let prev = unsafe { lua.set_waker(NonNull::from(waker)) };
+        Ok(WakerGuard {
+            lua,
+            prev,
+            _phantom: PhantomData,
+        })
     }
 }
 
 #[cfg(feature = "async")]
 impl<'lua, 'a> Drop for WakerGuard<'lua, 'a> {
     fn drop(&mut self) {
-        unsafe {
-            self.lua.set_waker(self.prev);
-        }
+        unsafe { self.lua.set_waker(self.prev) };
     }
 }
 

src/types.rs

@@ -10,14 +10,13 @@ use std::{fmt, mem, ptr};
 
 use rustc_hash::FxHashMap;
 
-#[cfg(feature = "async")]
-use futures_util::future::LocalBoxFuture;
-
 use crate::error::Result;
 #[cfg(not(feature = "luau"))]
 use crate::hook::Debug;
 use crate::lua::{ExtraData, Lua};
-use crate::value::MultiValue;
+
+#[cfg(feature = "async")]
+use {crate::value::MultiValue, futures_util::future::LocalBoxFuture};
 
 #[cfg(feature = "unstable")]
 use {crate::lua::LuaInner, std::marker::PhantomData};
@@ -30,12 +29,21 @@ pub type Integer = ffi::lua_Integer;
 /// Type of Lua floating point numbers.
 pub type Number = ffi::lua_Number;
 
+// Represents different subtypes wrapped to AnyUserData
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+pub(crate) enum SubtypeId {
+    None,
+    #[cfg(feature = "luau")]
+    Buffer,
+    #[cfg(feature = "luajit")]
+    CData,
+}
+
 /// A "light" userdata value. Equivalent to an unmanaged raw pointer.
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub struct LightUserData(pub *mut c_void);
 
-pub(crate) type Callback<'lua, 'a> =
-    Box<dyn Fn(&'lua Lua, MultiValue<'lua>) -> Result<MultiValue<'lua>> + 'a>;
+pub(crate) type Callback<'lua, 'a> = Box<dyn Fn(&'lua Lua, c_int) -> Result<c_int> + 'a>;
 
 pub(crate) struct Upvalue<T> {
     pub(crate) data: T,
@@ -46,13 +54,13 @@ pub(crate) type CallbackUpvalue = Upvalue<Callback<'static, 'static>>;
 
 #[cfg(feature = "async")]
 pub(crate) type AsyncCallback<'lua, 'a> =
-    Box<dyn Fn(&'lua Lua, MultiValue<'lua>) -> LocalBoxFuture<'lua, Result<MultiValue<'lua>>> + 'a>;
+    Box<dyn Fn(&'lua Lua, MultiValue<'lua>) -> LocalBoxFuture<'lua, Result<c_int>> + 'a>;
 
 #[cfg(feature = "async")]
 pub(crate) type AsyncCallbackUpvalue = Upvalue<AsyncCallback<'static, 'static>>;
 
 #[cfg(feature = "async")]
-pub(crate) type AsyncPollUpvalue = Upvalue<LocalBoxFuture<'static, Result<MultiValue<'static>>>>;
+pub(crate) type AsyncPollUpvalue = Upvalue<LocalBoxFuture<'static, Result<c_int>>>;
 
 /// Type to set next Luau VM action after executing interrupt function.
 #[cfg(any(feature = "luau", doc))]

src/userdata.rs

@@ -1,5 +1,6 @@
 use std::any::{type_name, TypeId};
 use std::cell::{Ref, RefCell, RefMut};
+use std::ffi::CStr;
 use std::fmt;
 use std::hash::Hash;
 use std::mem;
@@ -21,7 +22,7 @@ use crate::function::Function;
 use crate::lua::Lua;
 use crate::string::String;
 use crate::table::{Table, TablePairs};
-use crate::types::{LuaRef, MaybeSend};
+use crate::types::{LuaRef, MaybeSend, SubtypeId};
 use crate::util::{check_stack, get_userdata, take_userdata, StackGuard};
 use crate::value::{FromLua, FromLuaMulti, IntoLua, IntoLuaMulti, Value};
 use crate::UserDataRegistry;
@@ -36,6 +37,7 @@ pub(crate) const USER_VALUE_MAXSLOT: usize = 8;
 ///
 /// [`UserData`]: crate::UserData
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[non_exhaustive]
 pub enum MetaMethod {
     /// The `+` operator.
     Add,
@@ -141,6 +143,11 @@ pub enum MetaMethod {
     #[cfg(feature = "lua54")]
     #[cfg_attr(docsrs, doc(cfg(feature = "lua54")))]
     Close,
+    /// The `__name`/`__type` metafield.
+    ///
+    /// This is not a function, but it's value can be used by `tostring` and `typeof` built-in functions.
+    #[doc(hidden)]
+    Type,
 }
 
 impl PartialEq<MetaMethod> for &str {
@@ -212,6 +219,19 @@ impl MetaMethod {
 
             #[cfg(feature = "lua54")]
             MetaMethod::Close => "__close",
+
+            #[rustfmt::skip]
+            MetaMethod::Type => if cfg!(feature = "luau") { "__type" } else { "__name" },
+        }
+    }
+
+    pub(crate) const fn as_cstr(self) -> &'static CStr {
+        match self {
+            #[rustfmt::skip]
+            MetaMethod::Type => unsafe {
+                CStr::from_bytes_with_nul_unchecked(if cfg!(feature = "luau") { b"__type\0" } else { b"__name\0" })
+            },
+            _ => unreachable!(),
         }
     }
 
@@ -771,7 +791,7 @@ impl<T> Deref for UserDataVariant<T> {
 /// [`is`]: crate::AnyUserData::is
 /// [`borrow`]: crate::AnyUserData::borrow
 #[derive(Clone, Debug)]
-pub struct AnyUserData<'lua>(pub(crate) LuaRef<'lua>);
+pub struct AnyUserData<'lua>(pub(crate) LuaRef<'lua>, pub(crate) SubtypeId);
 
 /// Owned handle to an internal Lua userdata.
 ///
@@ -781,14 +801,14 @@ pub struct AnyUserData<'lua>(pub(crate) LuaRef<'lua>);
 #[cfg(feature = "unstable")]
 #[cfg_attr(docsrs, doc(cfg(feature = "unstable")))]
 #[derive(Clone, Debug)]
-pub struct OwnedAnyUserData(pub(crate) crate::types::LuaOwnedRef);
+pub struct OwnedAnyUserData(pub(crate) crate::types::LuaOwnedRef, pub(crate) SubtypeId);
 
 #[cfg(feature = "unstable")]
 impl OwnedAnyUserData {
     /// Get borrowed handle to the underlying Lua userdata.
     #[cfg_attr(feature = "send", allow(unused))]
     pub const fn to_ref(&self) -> AnyUserData {
-        AnyUserData(self.0.to_ref())
+        AnyUserData(self.0.to_ref(), self.1)
     }
 }
 
@@ -1081,16 +1101,25 @@ impl<'lua> AnyUserData<'lua> {
     #[cfg_attr(docsrs, doc(cfg(all(feature = "unstable", not(feature = "send")))))]
     #[inline]
     pub fn into_owned(self) -> OwnedAnyUserData {
-        OwnedAnyUserData(self.0.into_owned())
+        OwnedAnyUserData(self.0.into_owned(), self.1)
     }
 
-    #[inline(always)]
+    #[cfg(feature = "async")]
+    #[inline]
     pub(crate) fn type_id(&self) -> Result<Option<TypeId>> {
-        unsafe { self.0.lua.get_userdata_type_id(&self.0) }
+        unsafe { self.0.lua.get_userdata_ref_type_id(&self.0) }
     }
 
-    /// Returns a type name of this `UserData` (from `__name` metatable field).
+    /// Returns a type name of this `UserData` (from a metatable field).
     pub(crate) fn type_name(&self) -> Result<Option<StdString>> {
+        match self.1 {
+            SubtypeId::None => {}
+            #[cfg(feature = "luau")]
+            SubtypeId::Buffer => return Ok(Some("buffer".to_owned())),
+            #[cfg(feature = "luajit")]
+            SubtypeId::CData => return Ok(Some("cdata".to_owned())),
+        }
+
         let lua = self.0.lua;
         let state = lua.state();
         unsafe {
@@ -1101,10 +1130,10 @@ impl<'lua> AnyUserData<'lua> {
             let protect = !lua.unlikely_memory_error();
             let name_type = if protect {
                 protect_lua!(state, 1, 1, |state| {
-                    ffi::luaL_getmetafield(state, -1, cstr!("__name"))
+                    ffi::luaL_getmetafield(state, -1, MetaMethod::Type.as_cstr().as_ptr())
                 })?
             } else {
-                ffi::luaL_getmetafield(state, -1, cstr!("__name"))
+                ffi::luaL_getmetafield(state, -1, MetaMethod::Type.as_cstr().as_ptr())
             };
             match name_type {
                 ffi::LUA_TSTRING => Ok(Some(String(lua.pop_ref()).to_str()?.to_owned())),
@@ -1134,13 +1163,13 @@ impl<'lua> AnyUserData<'lua> {
         Ok(false)
     }
 
-    /// Returns true if this `AnyUserData` is serializable (eg. was created using `create_ser_userdata`).
+    /// Returns `true` if this `AnyUserData` is serializable (eg. was created using `create_ser_userdata`).
     #[cfg(feature = "serialize")]
     pub(crate) fn is_serializable(&self) -> bool {
         let lua = self.0.lua;
         let is_serializable = || unsafe {
             // Userdata can be unregistered or destructed
-            let _ = lua.get_userdata_type_id(&self.0)?;
+            let _ = lua.get_userdata_ref_type_id(&self.0)?;
 
             let ud = &*get_userdata::<UserDataCell<()>>(lua.ref_thread(), self.0.index);
             match &*ud.0.try_borrow().map_err(|_| Error::UserDataBorrowError)? {
@@ -1158,7 +1187,7 @@ impl<'lua> AnyUserData<'lua> {
     {
         let lua = self.0.lua;
         unsafe {
-            let type_id = lua.get_userdata_type_id(&self.0)?;
+            let type_id = lua.get_userdata_ref_type_id(&self.0)?;
             match type_id {
                 Some(type_id) if type_id == TypeId::of::<T>() => {
                     let ref_thread = lua.ref_thread();
@@ -1307,7 +1336,7 @@ impl<'lua> Serialize for AnyUserData<'lua> {
         let lua = self.0.lua;
         let data = unsafe {
             let _ = lua
-                .get_userdata_type_id(&self.0)
+                .get_userdata_ref_type_id(&self.0)
                 .map_err(ser::Error::custom)?;
             let ud = &*get_userdata::<UserDataCell<()>>(lua.ref_thread(), self.0.index);
             ud.0.try_borrow()

src/userdata_impl.rs

@@ -14,17 +14,13 @@ use crate::userdata::{
     AnyUserData, MetaMethod, UserData, UserDataCell, UserDataFields, UserDataMethods,
 };
 use crate::util::{get_userdata, short_type_name};
-use crate::value::{FromLua, FromLuaMulti, IntoLua, IntoLuaMulti, MultiValue, Value};
+use crate::value::{FromLua, FromLuaMulti, IntoLua, IntoLuaMulti, Value};
 
 #[cfg(not(feature = "send"))]
 use std::rc::Rc;
 
 #[cfg(feature = "async")]
-use {
-    crate::types::AsyncCallback,
-    futures_util::future::{self, TryFutureExt},
-    std::future::Future,
-};
+use {crate::types::AsyncCallback, futures_util::future, std::future::Future};
 
 /// Handle to registry for userdata methods and metamethods.
 pub struct UserDataRegistry<'lua, T: 'static> {
@@ -78,63 +74,61 @@ impl<'lua, T: 'static> UserDataRegistry<'lua, T> {
             };
         }
 
-        Box::new(move |lua, mut args| {
-            let front = args
-                .pop_front()
-                .ok_or_else(|| Error::from_lua_conversion("missing argument", "userdata", None));
-            let front = try_self_arg!(front);
-            let call = |ud| {
-                // Self was at index 1, so we pass 2 here
-                let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                method(lua, ud, args)?.into_lua_multi(lua)
-            };
+        Box::new(move |lua, nargs| unsafe {
+            if nargs == 0 {
+                let err = Error::from_lua_conversion("missing argument", "userdata", None);
+                try_self_arg!(Err(err));
+            }
+            let state = lua.state();
+            // Find absolute "self" index before processing args
+            let index = ffi::lua_absindex(state, -nargs);
+            // Self was at position 1, so we pass 2 here
+            let args = A::from_stack_args(nargs - 1, 2, Some(&name), lua);
 
-            let userdata = try_self_arg!(AnyUserData::from_lua(front, lua));
-            let (ref_thread, index) = (lua.ref_thread(), userdata.0.index);
-            match try_self_arg!(userdata.type_id()) {
-                Some(id) if id == TypeId::of::<T>() => unsafe {
-                    let ud = try_self_arg!(get_userdata_ref::<T>(ref_thread, index));
-                    call(&ud)
-                },
+            match try_self_arg!(lua.get_userdata_type_id(index)) {
+                Some(id) if id == TypeId::of::<T>() => {
+                    let ud = try_self_arg!(get_userdata_ref::<T>(state, index));
+                    method(lua, &ud, args?)?.push_into_stack_multi(lua)
+                }
                 #[cfg(not(feature = "send"))]
-                Some(id) if id == TypeId::of::<Rc<T>>() => unsafe {
-                    let ud = try_self_arg!(get_userdata_ref::<Rc<T>>(ref_thread, index));
-                    call(&ud)
-                },
+                Some(id) if id == TypeId::of::<Rc<T>>() => {
+                    let ud = try_self_arg!(get_userdata_ref::<Rc<T>>(state, index));
+                    method(lua, &ud, args?)?.push_into_stack_multi(lua)
+                }
                 #[cfg(not(feature = "send"))]
-                Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => unsafe {
-                    let ud = try_self_arg!(get_userdata_ref::<Rc<RefCell<T>>>(ref_thread, index));
+                Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => {
+                    let ud = try_self_arg!(get_userdata_ref::<Rc<RefCell<T>>>(state, index));
                     let ud = try_self_arg!(ud.try_borrow(), Error::UserDataBorrowError);
-                    call(&ud)
-                },
-                Some(id) if id == TypeId::of::<Arc<T>>() => unsafe {
-                    let ud = try_self_arg!(get_userdata_ref::<Arc<T>>(ref_thread, index));
-                    call(&ud)
-                },
-                Some(id) if id == TypeId::of::<Arc<Mutex<T>>>() => unsafe {
-                    let ud = try_self_arg!(get_userdata_ref::<Arc<Mutex<T>>>(ref_thread, index));
+                    method(lua, &ud, args?)?.push_into_stack_multi(lua)
+                }
+                Some(id) if id == TypeId::of::<Arc<T>>() => {
+                    let ud = try_self_arg!(get_userdata_ref::<Arc<T>>(state, index));
+                    method(lua, &ud, args?)?.push_into_stack_multi(lua)
+                }
+                Some(id) if id == TypeId::of::<Arc<Mutex<T>>>() => {
+                    let ud = try_self_arg!(get_userdata_ref::<Arc<Mutex<T>>>(state, index));
                     let ud = try_self_arg!(ud.try_lock(), Error::UserDataBorrowError);
-                    call(&ud)
-                },
+                    method(lua, &ud, args?)?.push_into_stack_multi(lua)
+                }
                 #[cfg(feature = "parking_lot")]
-                Some(id) if id == TypeId::of::<Arc<parking_lot::Mutex<T>>>() => unsafe {
-                    let ud = get_userdata_ref::<Arc<parking_lot::Mutex<T>>>(ref_thread, index);
+                Some(id) if id == TypeId::of::<Arc<parking_lot::Mutex<T>>>() => {
+                    let ud = get_userdata_ref::<Arc<parking_lot::Mutex<T>>>(state, index);
                     let ud = try_self_arg!(ud);
                     let ud = try_self_arg!(ud.try_lock().ok_or(Error::UserDataBorrowError));
-                    call(&ud)
-                },
-                Some(id) if id == TypeId::of::<Arc<RwLock<T>>>() => unsafe {
-                    let ud = try_self_arg!(get_userdata_ref::<Arc<RwLock<T>>>(ref_thread, index));
+                    method(lua, &ud, args?)?.push_into_stack_multi(lua)
+                }
+                Some(id) if id == TypeId::of::<Arc<RwLock<T>>>() => {
+                    let ud = try_self_arg!(get_userdata_ref::<Arc<RwLock<T>>>(state, index));
                     let ud = try_self_arg!(ud.try_read(), Error::UserDataBorrowError);
-                    call(&ud)
-                },
+                    method(lua, &ud, args?)?.push_into_stack_multi(lua)
+                }
                 #[cfg(feature = "parking_lot")]
-                Some(id) if id == TypeId::of::<Arc<parking_lot::RwLock<T>>>() => unsafe {
-                    let ud = get_userdata_ref::<Arc<parking_lot::RwLock<T>>>(ref_thread, index);
+                Some(id) if id == TypeId::of::<Arc<parking_lot::RwLock<T>>>() => {
+                    let ud = get_userdata_ref::<Arc<parking_lot::RwLock<T>>>(state, index);
                     let ud = try_self_arg!(ud);
                     let ud = try_self_arg!(ud.try_read().ok_or(Error::UserDataBorrowError));
-                    call(&ud)
-                },
+                    method(lua, &ud, args?)?.push_into_stack_multi(lua)
+                }
                 _ => Err(Error::bad_self_argument(&name, Error::UserDataTypeMismatch)),
             }
         })
@@ -157,60 +151,58 @@ impl<'lua, T: 'static> UserDataRegistry<'lua, T> {
         }
 
         let method = RefCell::new(method);
-        Box::new(move |lua, mut args| {
+        Box::new(move |lua, nargs| unsafe {
             let mut method = method
                 .try_borrow_mut()
                 .map_err(|_| Error::RecursiveMutCallback)?;
-            let front = args
-                .pop_front()
-                .ok_or_else(|| Error::from_lua_conversion("missing argument", "userdata", None));
-            let front = try_self_arg!(front);
-            let call = |ud| {
-                // Self was at index 1, so we pass 2 here
-                let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                method(lua, ud, args)?.into_lua_multi(lua)
-            };
+            if nargs == 0 {
+                let err = Error::from_lua_conversion("missing argument", "userdata", None);
+                try_self_arg!(Err(err));
+            }
+            let state = lua.state();
+            // Find absolute "self" index before processing args
+            let index = ffi::lua_absindex(state, -nargs);
+            // Self was at position 1, so we pass 2 here
+            let args = A::from_stack_args(nargs - 1, 2, Some(&name), lua);
 
-            let userdata = try_self_arg!(AnyUserData::from_lua(front, lua));
-            let (ref_thread, index) = (lua.ref_thread(), userdata.0.index);
-            match try_self_arg!(userdata.type_id()) {
-                Some(id) if id == TypeId::of::<T>() => unsafe {
-                    let mut ud = try_self_arg!(get_userdata_mut::<T>(ref_thread, index));
-                    call(&mut ud)
-                },
+            match try_self_arg!(lua.get_userdata_type_id(index)) {
+                Some(id) if id == TypeId::of::<T>() => {
+                    let mut ud = try_self_arg!(get_userdata_mut::<T>(state, index));
+                    method(lua, &mut ud, args?)?.push_into_stack_multi(lua)
+                }
                 #[cfg(not(feature = "send"))]
                 Some(id) if id == TypeId::of::<Rc<T>>() => Err(Error::UserDataBorrowMutError),
                 #[cfg(not(feature = "send"))]
-                Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => unsafe {
-                    let ud = try_self_arg!(get_userdata_mut::<Rc<RefCell<T>>>(ref_thread, index));
+                Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => {
+                    let ud = try_self_arg!(get_userdata_mut::<Rc<RefCell<T>>>(state, index));
                     let mut ud = try_self_arg!(ud.try_borrow_mut(), Error::UserDataBorrowMutError);
-                    call(&mut ud)
-                },
+                    method(lua, &mut ud, args?)?.push_into_stack_multi(lua)
+                }
                 Some(id) if id == TypeId::of::<Arc<T>>() => Err(Error::UserDataBorrowMutError),
-                Some(id) if id == TypeId::of::<Arc<Mutex<T>>>() => unsafe {
-                    let ud = try_self_arg!(get_userdata_mut::<Arc<Mutex<T>>>(ref_thread, index));
+                Some(id) if id == TypeId::of::<Arc<Mutex<T>>>() => {
+                    let ud = try_self_arg!(get_userdata_mut::<Arc<Mutex<T>>>(state, index));
                     let mut ud = try_self_arg!(ud.try_lock(), Error::UserDataBorrowMutError);
-                    call(&mut ud)
-                },
+                    method(lua, &mut ud, args?)?.push_into_stack_multi(lua)
+                }
                 #[cfg(feature = "parking_lot")]
-                Some(id) if id == TypeId::of::<Arc<parking_lot::Mutex<T>>>() => unsafe {
-                    let ud = get_userdata_mut::<Arc<parking_lot::Mutex<T>>>(ref_thread, index);
+                Some(id) if id == TypeId::of::<Arc<parking_lot::Mutex<T>>>() => {
+                    let ud = get_userdata_mut::<Arc<parking_lot::Mutex<T>>>(state, index);
                     let ud = try_self_arg!(ud);
                     let mut ud = try_self_arg!(ud.try_lock().ok_or(Error::UserDataBorrowMutError));
-                    call(&mut ud)
-                },
-                Some(id) if id == TypeId::of::<Arc<RwLock<T>>>() => unsafe {
-                    let ud = try_self_arg!(get_userdata_mut::<Arc<RwLock<T>>>(ref_thread, index));
+                    method(lua, &mut ud, args?)?.push_into_stack_multi(lua)
+                }
+                Some(id) if id == TypeId::of::<Arc<RwLock<T>>>() => {
+                    let ud = try_self_arg!(get_userdata_mut::<Arc<RwLock<T>>>(state, index));
                     let mut ud = try_self_arg!(ud.try_write(), Error::UserDataBorrowMutError);
-                    call(&mut ud)
-                },
+                    method(lua, &mut ud, args?)?.push_into_stack_multi(lua)
+                }
                 #[cfg(feature = "parking_lot")]
-                Some(id) if id == TypeId::of::<Arc<parking_lot::RwLock<T>>>() => unsafe {
-                    let ud = get_userdata_mut::<Arc<parking_lot::RwLock<T>>>(ref_thread, index);
+                Some(id) if id == TypeId::of::<Arc<parking_lot::RwLock<T>>>() => {
+                    let ud = get_userdata_mut::<Arc<parking_lot::RwLock<T>>>(state, index);
                     let ud = try_self_arg!(ud);
                     let mut ud = try_self_arg!(ud.try_write().ok_or(Error::UserDataBorrowMutError));
-                    call(&mut ud)
-                },
+                    method(lua, &mut ud, args?)?.push_into_stack_multi(lua)
+                }
                 _ => Err(Error::bad_self_argument(&name, Error::UserDataTypeMismatch)),
             }
         })
@@ -229,7 +221,7 @@ impl<'lua, T: 'static> UserDataRegistry<'lua, T> {
         let name = get_function_name::<T>(name);
         let method = Arc::new(method);
 
-        Box::new(move |lua, mut args| {
+        Box::new(move |lua, mut args| unsafe {
             let name = name.clone();
             let method = method.clone();
             macro_rules! try_self_arg {
@@ -242,76 +234,68 @@ impl<'lua, T: 'static> UserDataRegistry<'lua, T> {
             }
 
             Box::pin(async move {
-                let front = args.pop_front().ok_or_else(|| {
+                let this = args.pop_front().ok_or_else(|| {
                     Error::from_lua_conversion("missing argument", "userdata", None)
                 });
-                let front = try_self_arg!(front);
-                let userdata: AnyUserData = try_self_arg!(AnyUserData::from_lua(front, lua));
-                let (ref_thread, index) = (lua.ref_thread(), userdata.0.index);
-                match try_self_arg!(userdata.type_id()) {
-                    Some(id) if id == TypeId::of::<T>() => unsafe {
+                let this = try_self_arg!(AnyUserData::from_lua(try_self_arg!(this), lua));
+                let args = A::from_lua_args(args, 2, Some(&name), lua);
+
+                let (ref_thread, index) = (lua.ref_thread(), this.0.index);
+                match try_self_arg!(this.type_id()) {
+                    Some(id) if id == TypeId::of::<T>() => {
                         let ud = try_self_arg!(get_userdata_ref::<T>(ref_thread, index));
                         let ud = std::mem::transmute::<&T, &T>(&ud);
-                        // Self was at index 1, so we pass 2 here
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
                     #[cfg(not(feature = "send"))]
-                    Some(id) if id == TypeId::of::<Rc<T>>() => unsafe {
+                    Some(id) if id == TypeId::of::<Rc<T>>() => {
                         let ud = try_self_arg!(get_userdata_ref::<Rc<T>>(ref_thread, index));
                         let ud = std::mem::transmute::<&T, &T>(&ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
                     #[cfg(not(feature = "send"))]
-                    Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => unsafe {
+                    Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => {
                         let ud =
                             try_self_arg!(get_userdata_ref::<Rc<RefCell<T>>>(ref_thread, index));
                         let ud = try_self_arg!(ud.try_borrow(), Error::UserDataBorrowError);
                         let ud = std::mem::transmute::<&T, &T>(&ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
-                    Some(id) if id == TypeId::of::<Arc<T>>() => unsafe {
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
+                    Some(id) if id == TypeId::of::<Arc<T>>() => {
                         let ud = try_self_arg!(get_userdata_ref::<Arc<T>>(ref_thread, index));
                         let ud = std::mem::transmute::<&T, &T>(&ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
-                    Some(id) if id == TypeId::of::<Arc<Mutex<T>>>() => unsafe {
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
+                    Some(id) if id == TypeId::of::<Arc<Mutex<T>>>() => {
                         let ud =
                             try_self_arg!(get_userdata_ref::<Arc<Mutex<T>>>(ref_thread, index));
                         let ud = try_self_arg!(ud.try_lock(), Error::UserDataBorrowError);
                         let ud = std::mem::transmute::<&T, &T>(&ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
                     #[cfg(feature = "parking_lot")]
-                    Some(id) if id == TypeId::of::<Arc<parking_lot::Mutex<T>>>() => unsafe {
+                    Some(id) if id == TypeId::of::<Arc<parking_lot::Mutex<T>>>() => {
                         let ud = get_userdata_ref::<Arc<parking_lot::Mutex<T>>>(ref_thread, index);
                         let ud = try_self_arg!(ud);
                         let ud = try_self_arg!(ud.try_lock().ok_or(Error::UserDataBorrowError));
                         let ud = std::mem::transmute::<&T, &T>(&ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
-                    Some(id) if id == TypeId::of::<Arc<RwLock<T>>>() => unsafe {
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
+                    Some(id) if id == TypeId::of::<Arc<RwLock<T>>>() => {
                         let ud =
                             try_self_arg!(get_userdata_ref::<Arc<RwLock<T>>>(ref_thread, index));
                         let ud = try_self_arg!(ud.try_read(), Error::UserDataBorrowError);
                         let ud = std::mem::transmute::<&T, &T>(&ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
                     #[cfg(feature = "parking_lot")]
-                    Some(id) if id == TypeId::of::<Arc<parking_lot::RwLock<T>>>() => unsafe {
+                    Some(id) if id == TypeId::of::<Arc<parking_lot::RwLock<T>>>() => {
                         let ud = get_userdata_ref::<Arc<parking_lot::RwLock<T>>>(ref_thread, index);
                         let ud = try_self_arg!(ud);
                         let ud = try_self_arg!(ud.try_read().ok_or(Error::UserDataBorrowError));
                         let ud = std::mem::transmute::<&T, &T>(&ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
                     _ => Err(Error::bad_self_argument(&name, Error::UserDataTypeMismatch)),
                 }
             })
@@ -331,7 +315,7 @@ impl<'lua, T: 'static> UserDataRegistry<'lua, T> {
         let name = get_function_name::<T>(name);
         let method = Arc::new(method);
 
-        Box::new(move |lua, mut args| {
+        Box::new(move |lua, mut args| unsafe {
             let name = name.clone();
             let method = method.clone();
             macro_rules! try_self_arg {
@@ -344,72 +328,66 @@ impl<'lua, T: 'static> UserDataRegistry<'lua, T> {
             }
 
             Box::pin(async move {
-                let front = args.pop_front().ok_or_else(|| {
+                let this = args.pop_front().ok_or_else(|| {
                     Error::from_lua_conversion("missing argument", "userdata", None)
                 });
-                let front = try_self_arg!(front);
-                let userdata: AnyUserData = try_self_arg!(AnyUserData::from_lua(front, lua));
-                let (ref_thread, index) = (lua.ref_thread(), userdata.0.index);
-                match try_self_arg!(userdata.type_id()) {
-                    Some(id) if id == TypeId::of::<T>() => unsafe {
+                let this = try_self_arg!(AnyUserData::from_lua(try_self_arg!(this), lua));
+                let args = A::from_lua_args(args, 2, Some(&name), lua);
+
+                let (ref_thread, index) = (lua.ref_thread(), this.0.index);
+                match try_self_arg!(this.type_id()) {
+                    Some(id) if id == TypeId::of::<T>() => {
                         let mut ud = try_self_arg!(get_userdata_mut::<T>(ref_thread, index));
                         let ud = std::mem::transmute::<&mut T, &mut T>(&mut ud);
-                        // Self was at index 1, so we pass 2 here
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
                     #[cfg(not(feature = "send"))]
                     Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => {
                         Err(Error::UserDataBorrowMutError)
                     }
                     #[cfg(not(feature = "send"))]
-                    Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => unsafe {
+                    Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => {
                         let ud =
                             try_self_arg!(get_userdata_mut::<Rc<RefCell<T>>>(ref_thread, index));
                         let mut ud =
                             try_self_arg!(ud.try_borrow_mut(), Error::UserDataBorrowMutError);
                         let ud = std::mem::transmute::<&mut T, &mut T>(&mut ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
                     #[cfg(not(feature = "send"))]
                     Some(id) if id == TypeId::of::<Arc<T>>() => Err(Error::UserDataBorrowMutError),
-                    Some(id) if id == TypeId::of::<Arc<Mutex<T>>>() => unsafe {
+                    Some(id) if id == TypeId::of::<Arc<Mutex<T>>>() => {
                         let ud =
                             try_self_arg!(get_userdata_mut::<Arc<Mutex<T>>>(ref_thread, index));
                         let mut ud = try_self_arg!(ud.try_lock(), Error::UserDataBorrowMutError);
                         let ud = std::mem::transmute::<&mut T, &mut T>(&mut ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
                     #[cfg(feature = "parking_lot")]
-                    Some(id) if id == TypeId::of::<Arc<parking_lot::Mutex<T>>>() => unsafe {
+                    Some(id) if id == TypeId::of::<Arc<parking_lot::Mutex<T>>>() => {
                         let ud = get_userdata_mut::<Arc<parking_lot::Mutex<T>>>(ref_thread, index);
                         let ud = try_self_arg!(ud);
                         let mut ud =
                             try_self_arg!(ud.try_lock().ok_or(Error::UserDataBorrowMutError));
                         let ud = std::mem::transmute::<&mut T, &mut T>(&mut ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
-                    Some(id) if id == TypeId::of::<Arc<RwLock<T>>>() => unsafe {
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
+                    Some(id) if id == TypeId::of::<Arc<RwLock<T>>>() => {
                         let ud =
                             try_self_arg!(get_userdata_mut::<Arc<RwLock<T>>>(ref_thread, index));
                         let mut ud = try_self_arg!(ud.try_write(), Error::UserDataBorrowMutError);
                         let ud = std::mem::transmute::<&mut T, &mut T>(&mut ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
                     #[cfg(feature = "parking_lot")]
-                    Some(id) if id == TypeId::of::<Arc<parking_lot::RwLock<T>>>() => unsafe {
+                    Some(id) if id == TypeId::of::<Arc<parking_lot::RwLock<T>>>() => {
                         let ud = get_userdata_mut::<Arc<parking_lot::RwLock<T>>>(ref_thread, index);
                         let ud = try_self_arg!(ud);
                         let mut ud =
                             try_self_arg!(ud.try_write().ok_or(Error::UserDataBorrowMutError));
                         let ud = std::mem::transmute::<&mut T, &mut T>(&mut ud);
-                        let args = A::from_lua_multi_args(args, 2, Some(&name), lua)?;
-                        method(lua, ud, args).await?.into_lua_multi(lua)
-                    },
+                        method(lua, ud, args?).await?.push_into_stack_multi(lua)
+                    }
                     _ => Err(Error::bad_self_argument(&name, Error::UserDataTypeMismatch)),
                 }
             })
@@ -423,8 +401,9 @@ impl<'lua, T: 'static> UserDataRegistry<'lua, T> {
         R: IntoLuaMulti<'lua>,
     {
         let name = get_function_name::<T>(name);
-        Box::new(move |lua, args| {
-            function(lua, A::from_lua_multi_args(args, 1, Some(&name), lua)?)?.into_lua_multi(lua)
+        Box::new(move |lua, nargs| unsafe {
+            let args = A::from_stack_args(nargs, 1, Some(&name), lua)?;
+            function(lua, args)?.push_into_stack_multi(lua)
         })
     }
 
@@ -436,11 +415,12 @@ impl<'lua, T: 'static> UserDataRegistry<'lua, T> {
     {
         let name = get_function_name::<T>(name);
         let function = RefCell::new(function);
-        Box::new(move |lua, args| {
+        Box::new(move |lua, nargs| unsafe {
             let function = &mut *function
                 .try_borrow_mut()
                 .map_err(|_| Error::RecursiveMutCallback)?;
-            function(lua, A::from_lua_multi_args(args, 1, Some(&name), lua)?)?.into_lua_multi(lua)
+            let args = A::from_stack_args(nargs, 1, Some(&name), lua)?;
+            function(lua, args)?.push_into_stack_multi(lua)
         })
     }
 
@@ -453,22 +433,17 @@ impl<'lua, T: 'static> UserDataRegistry<'lua, T> {
         R: IntoLuaMulti<'lua>,
     {
         let name = get_function_name::<T>(name);
-        Box::new(move |lua, args| {
-            let args = match A::from_lua_multi_args(args, 1, Some(&name), lua) {
+        Box::new(move |lua, args| unsafe {
+            let args = match A::from_lua_args(args, 1, Some(&name), lua) {
                 Ok(args) => args,
                 Err(e) => return Box::pin(future::err(e)),
             };
-            Box::pin(
-                function(lua, args).and_then(move |ret| future::ready(ret.into_lua_multi(lua))),
-            )
+            let fut = function(lua, args);
+            Box::pin(async move { fut.await?.push_into_stack_multi(lua) })
         })
     }
 
-    pub(crate) fn check_meta_field<V>(
-        lua: &'lua Lua,
-        name: &str,
-        value: V,
-    ) -> Result<MultiValue<'lua>>
+    pub(crate) fn check_meta_field<V>(lua: &'lua Lua, name: &str, value: V) -> Result<Value<'lua>>
     where
         V: IntoLua<'lua>,
     {
@@ -485,7 +460,7 @@ impl<'lua, T: 'static> UserDataRegistry<'lua, T> {
                 }
             }
         }
-        value.into_lua_multi(lua)
+        value.into_lua(lua)
     }
 }
 
@@ -502,7 +477,7 @@ impl<'lua, T: 'static> UserDataFields<'lua, T> for UserDataRegistry<'lua, T> {
         let name = name.as_ref().to_string();
         self.fields.push((
             name,
-            Box::new(move |lua, _| value.clone().into_lua_multi(lua)),
+            Box::new(move |lua, _| unsafe { value.clone().push_into_stack_multi(lua) }),
         ));
     }
 
@@ -554,7 +529,9 @@ impl<'lua, T: 'static> UserDataFields<'lua, T> for UserDataRegistry<'lua, T> {
         let name2 = name.clone();
         self.meta_fields.push((
             name,
-            Box::new(move |lua, _| Self::check_meta_field(lua, &name2, value.clone())),
+            Box::new(move |lua, _| unsafe {
+                Self::check_meta_field(lua, &name2, value.clone())?.push_into_stack_multi(lua)
+            }),
         ));
     }
 
@@ -567,7 +544,9 @@ impl<'lua, T: 'static> UserDataFields<'lua, T> for UserDataRegistry<'lua, T> {
         let name2 = name.clone();
         self.meta_fields.push((
             name,
-            Box::new(move |lua, _| Self::check_meta_field(lua, &name2, f(lua)?)),
+            Box::new(move |lua, _| unsafe {
+                Self::check_meta_field(lua, &name2, f(lua)?)?.push_into_stack_multi(lua)
+            }),
         ));
     }
 

src/util/mod.rs

@@ -6,7 +6,7 @@ use std::mem::MaybeUninit;
 use std::os::raw::{c_char, c_int, c_void};
 use std::panic::{catch_unwind, resume_unwind, AssertUnwindSafe};
 use std::sync::Arc;
-use std::{mem, ptr, slice, str};
+use std::{ptr, slice, str};
 
 use once_cell::sync::Lazy;
 use rustc_hash::FxHashMap;
@@ -63,6 +63,11 @@ impl StackGuard {
             top: ffi::lua_gettop(state),
         }
     }
+
+    // Same as `new()`, but allows specifying the expected stack size at the end of the scope.
+    pub const fn with_top(state: *mut ffi::lua_State, top: c_int) -> StackGuard {
+        StackGuard { state, top }
+    }
 }
 
 impl Drop for StackGuard {
@@ -88,7 +93,7 @@ impl Drop for StackGuard {
 pub unsafe fn protect_lua_call(
     state: *mut ffi::lua_State,
     nargs: c_int,
-    f: unsafe extern "C" fn(*mut ffi::lua_State) -> c_int,
+    f: unsafe extern "C-unwind" fn(*mut ffi::lua_State) -> c_int,
 ) -> Result<()> {
     let stack_start = ffi::lua_gettop(state) - nargs;
 
@@ -133,7 +138,7 @@ where
         nresults: c_int,
     }
 
-    unsafe extern "C" fn do_call<F, R>(state: *mut ffi::lua_State) -> c_int
+    unsafe extern "C-unwind" fn do_call<F, R>(state: *mut ffi::lua_State) -> c_int
     where
         F: Fn(*mut ffi::lua_State) -> R,
         R: Copy,
@@ -277,38 +282,23 @@ pub unsafe fn rawset_field(state: *mut ffi::lua_State, table: c_int, field: &str
 }
 
 // Internally uses 3 stack spaces, does not call checkstack.
-#[cfg(not(feature = "luau"))]
 #[inline]
 pub unsafe fn push_userdata<T>(state: *mut ffi::lua_State, t: T, protect: bool) -> Result<()> {
+    #[cfg(not(feature = "luau"))]
     let ud = if protect {
         protect_lua!(state, 0, 1, |state| {
-            ffi::lua_newuserdata(state, mem::size_of::<T>()) as *mut T
+            ffi::lua_newuserdata(state, std::mem::size_of::<T>()) as *mut T
         })?
     } else {
-        ffi::lua_newuserdata(state, mem::size_of::<T>()) as *mut T
+        ffi::lua_newuserdata(state, std::mem::size_of::<T>()) as *mut T
     };
-    ptr::write(ud, t);
-    Ok(())
-}
-
-// Internally uses 3 stack spaces, does not call checkstack.
-#[cfg(feature = "luau")]
-#[inline]
-pub unsafe fn push_userdata<T>(state: *mut ffi::lua_State, t: T, protect: bool) -> Result<()> {
-    unsafe extern "C" fn destructor<T>(ud: *mut c_void) {
-        ptr::drop_in_place(ud as *mut T);
-    }
-
-    let size = mem::size_of::<T>();
+    #[cfg(feature = "luau")]
     let ud = if protect {
-        protect_lua!(state, 0, 1, |state| {
-            ffi::lua_newuserdatadtor(state, size, destructor::<T>) as *mut T
-        })?
+        protect_lua!(state, 0, 1, |state| { ffi::lua_newuserdata_t::<T>(state) })?
     } else {
-        ffi::lua_newuserdatadtor(state, size, destructor::<T>) as *mut T
+        ffi::lua_newuserdata_t::<T>(state)
     };
     ptr::write(ud, t);
-
     Ok(())
 }
 
@@ -323,10 +313,10 @@ pub unsafe fn push_userdata_uv<T>(
 ) -> Result<()> {
     let ud = if protect {
         protect_lua!(state, 0, 1, |state| {
-            ffi::lua_newuserdatauv(state, mem::size_of::<T>(), nuvalue) as *mut T
+            ffi::lua_newuserdatauv(state, std::mem::size_of::<T>(), nuvalue) as *mut T
         })?
     } else {
-        ffi::lua_newuserdatauv(state, mem::size_of::<T>(), nuvalue) as *mut T
+        ffi::lua_newuserdatauv(state, std::mem::size_of::<T>(), nuvalue) as *mut T
     };
     ptr::write(ud, t);
     Ok(())
@@ -400,16 +390,16 @@ pub unsafe fn get_gc_userdata<T: Any>(
     ud
 }
 
-unsafe extern "C" fn lua_error_impl(state: *mut ffi::lua_State) -> c_int {
+unsafe extern "C-unwind" fn lua_error_impl(state: *mut ffi::lua_State) -> c_int {
     ffi::lua_error(state);
 }
 
-unsafe extern "C" fn lua_isfunction_impl(state: *mut ffi::lua_State) -> c_int {
+unsafe extern "C-unwind" fn lua_isfunction_impl(state: *mut ffi::lua_State) -> c_int {
     ffi::lua_pushboolean(state, ffi::lua_isfunction(state, -1));
     1
 }
 
-unsafe extern "C" fn lua_istable_impl(state: *mut ffi::lua_State) -> c_int {
+unsafe extern "C-unwind" fn lua_istable_impl(state: *mut ffi::lua_State) -> c_int {
     ffi::lua_pushboolean(state, ffi::lua_istable(state, -1));
     1
 }
@@ -613,7 +603,7 @@ pub unsafe fn init_userdata_metatable(
 }
 
 #[cfg(not(feature = "luau"))]
-pub unsafe extern "C" fn userdata_destructor<T>(state: *mut ffi::lua_State) -> c_int {
+pub unsafe extern "C-unwind" fn userdata_destructor<T>(state: *mut ffi::lua_State) -> c_int {
     // It's probably NOT a good idea to catch Rust panics in finalizer
     // Lua 5.4 ignores it, other versions generates `LUA_ERRGCMM` without calling message handler
     take_userdata::<T>(state);
@@ -685,7 +675,7 @@ where
     }
 }
 
-pub unsafe extern "C" fn error_traceback(state: *mut ffi::lua_State) -> c_int {
+pub unsafe extern "C-unwind" fn error_traceback(state: *mut ffi::lua_State) -> c_int {
     // Luau calls error handler for memory allocation errors, skip it
     // See https://github.com/Roblox/luau/issues/880
     #[cfg(feature = "luau")]
@@ -725,7 +715,7 @@ pub unsafe fn error_traceback_thread(state: *mut ffi::lua_State, thread: *mut ff
 }
 
 // A variant of `pcall` that does not allow Lua to catch Rust panics from `callback_error`.
-pub unsafe extern "C" fn safe_pcall(state: *mut ffi::lua_State) -> c_int {
+pub unsafe extern "C-unwind" fn safe_pcall(state: *mut ffi::lua_State) -> c_int {
     ffi::luaL_checkstack(state, 2, ptr::null());
 
     let top = ffi::lua_gettop(state);
@@ -751,8 +741,8 @@ pub unsafe extern "C" fn safe_pcall(state: *mut ffi::lua_State) -> c_int {
 }
 
 // A variant of `xpcall` that does not allow Lua to catch Rust panics from `callback_error`.
-pub unsafe extern "C" fn safe_xpcall(state: *mut ffi::lua_State) -> c_int {
-    unsafe extern "C" fn xpcall_msgh(state: *mut ffi::lua_State) -> c_int {
+pub unsafe extern "C-unwind" fn safe_xpcall(state: *mut ffi::lua_State) -> c_int {
+    unsafe extern "C-unwind" fn xpcall_msgh(state: *mut ffi::lua_State) -> c_int {
         ffi::luaL_checkstack(state, 2, ptr::null());
 
         if let Some(WrappedFailure::Panic(_)) =
@@ -866,7 +856,7 @@ pub unsafe fn init_error_registry(state: *mut ffi::lua_State) -> Result<()> {
 
     // Create error and panic metatables
 
-    unsafe extern "C" fn error_tostring(state: *mut ffi::lua_State) -> c_int {
+    unsafe extern "C-unwind" fn error_tostring(state: *mut ffi::lua_State) -> c_int {
         callback_error(state, |_| {
             check_stack(state, 3)?;
 
@@ -924,7 +914,7 @@ pub unsafe fn init_error_registry(state: *mut ffi::lua_State) -> Result<()> {
 
     // Create destructed userdata metatable
 
-    unsafe extern "C" fn destructed_error(state: *mut ffi::lua_State) -> c_int {
+    unsafe extern "C-unwind" fn destructed_error(state: *mut ffi::lua_State) -> c_int {
         callback_error(state, |_| Err(Error::CallbackDestructed))
     }
 
@@ -1004,16 +994,10 @@ pub(crate) enum WrappedFailure {
 
 impl WrappedFailure {
     pub(crate) unsafe fn new_userdata(state: *mut ffi::lua_State) -> *mut Self {
-        let size = mem::size_of::<WrappedFailure>();
         #[cfg(feature = "luau")]
-        let ud = {
-            unsafe extern "C" fn destructor(p: *mut c_void) {
-                ptr::drop_in_place(p as *mut WrappedFailure);
-            }
-            ffi::lua_newuserdatadtor(state, size, destructor) as *mut Self
-        };
+        let ud = ffi::lua_newuserdata_t::<Self>(state);
         #[cfg(not(feature = "luau"))]
-        let ud = ffi::lua_newuserdata(state, size) as *mut Self;
+        let ud = ffi::lua_newuserdata(state, std::mem::size_of::<Self>()) as *mut Self;
         ptr::write(ud, WrappedFailure::None);
         ud
     }
@@ -1059,6 +1043,8 @@ pub(crate) unsafe fn to_string(state: *mut ffi::lua_State, index: c_int) -> Stri
         ffi::LUA_TFUNCTION => format!("<function {:?}>", ffi::lua_topointer(state, index)),
         ffi::LUA_TUSERDATA => format!("<userdata {:?}>", ffi::lua_topointer(state, index)),
         ffi::LUA_TTHREAD => format!("<thread {:?}>", ffi::lua_topointer(state, index)),
+        #[cfg(feature = "luau")]
+        ffi::LUA_TBUFFER => format!("<buffer {:?}>", ffi::lua_topointer(state, index)),
         _ => "<unknown>".to_string(),
     }
 }

src/value.rs

@@ -1,17 +1,21 @@
+use std::borrow::Cow;
 use std::cmp::Ordering;
 use std::collections::HashSet;
 use std::iter::{self, FromIterator};
 use std::ops::Index;
-use std::os::raw::c_void;
+use std::os::raw::{c_int, c_void};
 use std::string::String as StdString;
 use std::sync::Arc;
-use std::{fmt, ptr, slice, str, vec};
+use std::{fmt, mem, ptr, slice, str, vec};
+
+use num_traits::FromPrimitive;
 
 #[cfg(feature = "serialize")]
 use {
+    crate::table::SerializableTable,
+    rustc_hash::FxHashSet,
     serde::ser::{self, Serialize, Serializer},
-    std::convert::TryInto,
-    std::result::Result as StdResult,
+    std::{cell::RefCell, convert::TryInto, rc::Rc, result::Result as StdResult},
 };
 
 use crate::error::{Error, Result};
@@ -20,7 +24,7 @@ use crate::lua::Lua;
 use crate::string::String;
 use crate::table::Table;
 use crate::thread::Thread;
-use crate::types::{Integer, LightUserData, Number};
+use crate::types::{Integer, LightUserData, Number, SubtypeId};
 use crate::userdata::AnyUserData;
 use crate::util::{check_stack, StackGuard};
 
@@ -84,7 +88,11 @@ impl<'lua> Value<'lua> {
             Value::Table(_) => "table",
             Value::Function(_) => "function",
             Value::Thread(_) => "thread",
-            Value::UserData(_) => "userdata",
+            Value::UserData(AnyUserData(_, SubtypeId::None)) => "userdata",
+            #[cfg(feature = "luau")]
+            Value::UserData(AnyUserData(_, SubtypeId::Buffer)) => "buffer",
+            #[cfg(feature = "luajit")]
+            Value::UserData(AnyUserData(_, SubtypeId::CData)) => "cdata",
             Value::Error(_) => "error",
         }
     }
@@ -121,8 +129,8 @@ impl<'lua> Value<'lua> {
             Value::String(String(r))
             | Value::Table(Table(r))
             | Value::Function(Function(r))
-            | Value::Thread(Thread(r))
-            | Value::UserData(AnyUserData(r)) => r.to_pointer(),
+            | Value::Thread(Thread(r, ..))
+            | Value::UserData(AnyUserData(r, ..)) => r.to_pointer(),
             _ => ptr::null(),
         }
     }
@@ -143,8 +151,8 @@ impl<'lua> Value<'lua> {
             Value::String(s) => Ok(s.to_str()?.to_string()),
             Value::Table(Table(r))
             | Value::Function(Function(r))
-            | Value::Thread(Thread(r))
-            | Value::UserData(AnyUserData(r)) => unsafe {
+            | Value::Thread(Thread(r, ..))
+            | Value::UserData(AnyUserData(r, ..)) => unsafe {
                 let state = r.lua.state();
                 let _guard = StackGuard::new(state);
                 check_stack(state, 3)?;
@@ -159,6 +167,285 @@ impl<'lua> Value<'lua> {
         }
     }
 
+    /// Returns `true` if the value is a [`Nil`].
+    #[inline]
+    pub fn is_nil(&self) -> bool {
+        self == &Nil
+    }
+
+    /// Returns `true` if the value is a [`NULL`].
+    #[inline]
+    pub fn is_null(&self) -> bool {
+        self == &Self::NULL
+    }
+
+    /// Returns `true` if the value is a boolean.
+    #[inline]
+    pub fn is_boolean(&self) -> bool {
+        self.as_boolean().is_some()
+    }
+
+    /// Cast the value to boolean.
+    ///
+    /// If the value is a Boolean, returns it or `None` otherwise.
+    #[inline]
+    pub fn as_boolean(&self) -> Option<bool> {
+        match *self {
+            Value::Boolean(b) => Some(b),
+            _ => None,
+        }
+    }
+
+    /// Returns `true` if the value is a [`LightUserData`].
+    #[inline]
+    pub fn is_light_userdata(&self) -> bool {
+        self.as_light_userdata().is_some()
+    }
+
+    /// Cast the value to [`LightUserData`].
+    ///
+    /// If the value is a [`LightUserData`], returns it or `None` otherwise.
+    #[inline]
+    pub fn as_light_userdata(&self) -> Option<LightUserData> {
+        match *self {
+            Value::LightUserData(l) => Some(l),
+            _ => None,
+        }
+    }
+
+    /// Returns `true` if the value is an [`Integer`].
+    #[inline]
+    pub fn is_integer(&self) -> bool {
+        self.as_integer().is_some()
+    }
+
+    /// Cast the value to [`Integer`].
+    ///
+    /// If the value is a Lua [`Integer`], returns it or `None` otherwise.
+    #[inline]
+    pub fn as_integer(&self) -> Option<Integer> {
+        match *self {
+            Value::Integer(i) => Some(i),
+            _ => None,
+        }
+    }
+
+    /// Cast the value to `i32`.
+    ///
+    /// If the value is a Lua [`Integer`], try to convert it to `i32` or return `None` otherwise.
+    #[inline]
+    pub fn as_i32(&self) -> Option<i32> {
+        #[allow(clippy::useless_conversion)]
+        self.as_integer().and_then(|i| i32::try_from(i).ok())
+    }
+
+    /// Cast the value to `u32`.
+    ///
+    /// If the value is a Lua [`Integer`], try to convert it to `u32` or return `None` otherwise.
+    #[inline]
+    pub fn as_u32(&self) -> Option<u32> {
+        self.as_integer().and_then(|i| u32::try_from(i).ok())
+    }
+
+    /// Cast the value to `i64`.
+    ///
+    /// If the value is a Lua [`Integer`], try to convert it to `i64` or return `None` otherwise.
+    #[inline]
+    pub fn as_i64(&self) -> Option<i64> {
+        #[allow(clippy::useless_conversion)]
+        self.as_integer().and_then(|i| i64::try_from(i).ok())
+    }
+
+    /// Cast the value to `u64`.
+    ///
+    /// If the value is a Lua [`Integer`], try to convert it to `u64` or return `None` otherwise.
+    #[inline]
+    pub fn as_u64(&self) -> Option<u64> {
+        self.as_integer().and_then(|i| u64::try_from(i).ok())
+    }
+
+    /// Cast the value to `isize`.
+    ///
+    /// If the value is a Lua [`Integer`], try to convert it to `isize` or return `None` otherwise.
+    #[inline]
+    pub fn as_isize(&self) -> Option<isize> {
+        self.as_integer().and_then(|i| isize::try_from(i).ok())
+    }
+
+    /// Cast the value to `usize`.
+    ///
+    /// If the value is a Lua [`Integer`], try to convert it to `usize` or return `None` otherwise.
+    #[inline]
+    pub fn as_usize(&self) -> Option<usize> {
+        self.as_integer().and_then(|i| usize::try_from(i).ok())
+    }
+
+    /// Returns `true` if the value is a Lua [`Number`].
+    #[inline]
+    pub fn is_number(&self) -> bool {
+        self.as_number().is_some()
+    }
+
+    /// Cast the value to [`Number`].
+    ///
+    /// If the value is a Lua [`Number`], returns it or `None` otherwise.
+    #[inline]
+    pub fn as_number(&self) -> Option<Number> {
+        match *self {
+            Value::Number(n) => Some(n),
+            _ => None,
+        }
+    }
+
+    /// Cast the value to `f32`.
+    ///
+    /// If the value is a Lua [`Number`], try to convert it to `f32` or return `None` otherwise.
+    #[inline]
+    pub fn as_f32(&self) -> Option<f32> {
+        self.as_number().and_then(f32::from_f64)
+    }
+
+    /// Cast the value to `f64`.
+    ///
+    /// If the value is a Lua [`Number`], try to convert it to `f64` or return `None` otherwise.
+    #[inline]
+    pub fn as_f64(&self) -> Option<f64> {
+        self.as_number()
+    }
+
+    /// Returns `true` if the value is a Lua [`String`].
+    #[inline]
+    pub fn is_string(&self) -> bool {
+        self.as_string().is_some()
+    }
+
+    /// Cast the value to Lua [`String`].
+    ///
+    /// If the value is a Lua [`String`], returns it or `None` otherwise.
+    #[inline]
+    pub fn as_string(&self) -> Option<&String> {
+        match self {
+            Value::String(s) => Some(s),
+            _ => None,
+        }
+    }
+
+    /// Cast the value to [`str`].
+    ///
+    /// If the value is a Lua [`String`], try to convert it to [`str`] or return `None` otherwise.
+    #[inline]
+    pub fn as_str(&self) -> Option<&str> {
+        self.as_string().and_then(|s| s.to_str().ok())
+    }
+
+    /// Cast the value to [`Cow<str>`].
+    ///
+    /// If the value is a Lua [`String`], converts it to [`Cow<str>`] or returns `None` otherwise.
+    #[inline]
+    pub fn as_string_lossy(&self) -> Option<Cow<str>> {
+        self.as_string().map(|s| s.to_string_lossy())
+    }
+
+    /// Returns `true` if the value is a Lua [`Table`].
+    #[inline]
+    pub fn is_table(&self) -> bool {
+        self.as_table().is_some()
+    }
+
+    /// Cast the value to [`Table`].
+    ///
+    /// If the value is a Lua [`Table`], returns it or `None` otherwise.
+    #[inline]
+    pub fn as_table(&self) -> Option<&Table> {
+        match self {
+            Value::Table(t) => Some(t),
+            _ => None,
+        }
+    }
+
+    /// Returns `true` if the value is a Lua [`Thread`].
+    #[inline]
+    pub fn is_thread(&self) -> bool {
+        self.as_thread().is_some()
+    }
+
+    /// Cast the value to [`Thread`].
+    ///
+    /// If the value is a Lua [`Thread`], returns it or `None` otherwise.
+    #[inline]
+    pub fn as_thread(&self) -> Option<&Thread> {
+        match self {
+            Value::Thread(t) => Some(t),
+            _ => None,
+        }
+    }
+
+    /// Returns `true` if the value is a Lua [`Function`].
+    #[inline]
+    pub fn is_function(&self) -> bool {
+        self.as_function().is_some()
+    }
+
+    /// Cast the value to [`Function`].
+    ///
+    /// If the value is a Lua [`Function`], returns it or `None` otherwise.
+    #[inline]
+    pub fn as_function(&self) -> Option<&Function> {
+        match self {
+            Value::Function(f) => Some(f),
+            _ => None,
+        }
+    }
+
+    /// Returns `true` if the value is an [`AnyUserData`].
+    #[inline]
+    pub fn is_userdata(&self) -> bool {
+        self.as_userdata().is_some()
+    }
+
+    /// Cast the value to [`AnyUserData`].
+    ///
+    /// If the value is an [`AnyUserData`], returns it or `None` otherwise.
+    #[inline]
+    pub fn as_userdata(&self) -> Option<&AnyUserData> {
+        match self {
+            Value::UserData(ud) => Some(ud),
+            _ => None,
+        }
+    }
+
+    /// Returns `true` if the value is a Buffer wrapped in [`AnyUserData`].
+    #[cfg(any(feature = "luau", doc))]
+    #[cfg_attr(docsrs, doc(cfg(feature = "luau")))]
+    #[doc(hidden)]
+    #[inline]
+    pub fn is_buffer(&self) -> bool {
+        self.as_userdata()
+            .map(|ud| ud.1 == SubtypeId::Buffer)
+            .unwrap_or_default()
+    }
+
+    /// Returns `true` if the value is a CData wrapped in [`AnyUserData`].
+    #[cfg(any(feature = "luajit", doc))]
+    #[cfg_attr(docsrs, doc(cfg(feature = "luajit")))]
+    #[doc(hidden)]
+    #[inline]
+    pub fn is_cdata(&self) -> bool {
+        self.as_userdata()
+            .map(|ud| ud.1 == SubtypeId::CData)
+            .unwrap_or_default()
+    }
+
+    /// Wrap reference to this Value into [`SerializableValue`].
+    ///
+    /// This allows customizing serialization behavior using serde.
+    #[cfg(feature = "serialize")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "serialize")))]
+    #[doc(hidden)]
+    pub fn to_serializable(&self) -> SerializableValue<'_, 'lua> {
+        SerializableValue::new(self, Default::default(), None)
+    }
+
     // Compares two values.
     // Used to sort values for Debug printing.
     pub(crate) fn cmp(&self, other: &Self) -> Ordering {
@@ -223,7 +510,7 @@ impl<'lua> Value<'lua> {
             f @ Value::Function(_) => write!(fmt, "function: {:?}", f.to_pointer()),
             t @ Value::Thread(_) => write!(fmt, "thread: {:?}", t.to_pointer()),
             u @ Value::UserData(ud) => {
-                // Try `__name` first then `__tostring`
+                // Try `__name/__type` first then `__tostring`
                 let name = ud.type_name().ok().flatten();
                 let s = name
                     .map(|name| format!("{name}: {:?}", u.to_pointer()))
@@ -289,13 +576,86 @@ impl<'lua> AsRef<Value<'lua>> for Value<'lua> {
     }
 }
 
+/// A wrapped [`Value`] with customized serialization behavior.
+#[cfg(feature = "serialize")]
+#[cfg_attr(docsrs, doc(cfg(feature = "serialize")))]
+pub struct SerializableValue<'a, 'lua> {
+    value: &'a Value<'lua>,
+    options: crate::serde::de::Options,
+    // In many cases we don't need `visited` map, so don't allocate memory by default
+    visited: Option<Rc<RefCell<FxHashSet<*const c_void>>>>,
+}
+
 #[cfg(feature = "serialize")]
 impl<'lua> Serialize for Value<'lua> {
+    #[inline]
+    fn serialize<S: Serializer>(&self, serializer: S) -> StdResult<S::Ok, S::Error> {
+        SerializableValue::new(self, Default::default(), None).serialize(serializer)
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl<'a, 'lua> SerializableValue<'a, 'lua> {
+    #[inline]
+    pub(crate) fn new(
+        value: &'a Value<'lua>,
+        options: crate::serde::de::Options,
+        visited: Option<&Rc<RefCell<FxHashSet<*const c_void>>>>,
+    ) -> Self {
+        if let Value::Table(_) = value {
+            return Self {
+                value,
+                options,
+                // We need to always initialize the `visited` map for Tables
+                visited: visited.cloned().or_else(|| Some(Default::default())),
+            };
+        }
+        Self {
+            value,
+            options,
+            visited: None,
+        }
+    }
+
+    /// If true, an attempt to serialize types such as [`Function`], [`Thread`], [`LightUserData`]
+    /// and [`Error`] will cause an error.
+    /// Otherwise these types skipped when iterating or serialized as unit type.
+    ///
+    /// Default: **true**
+    #[must_use]
+    pub const fn deny_unsupported_types(mut self, enabled: bool) -> Self {
+        self.options.deny_unsupported_types = enabled;
+        self
+    }
+
+    /// If true, an attempt to serialize a recursive table (table that refers to itself)
+    /// will cause an error.
+    /// Otherwise subsequent attempts to serialize the same table will be ignored.
+    ///
+    /// Default: **true**
+    #[must_use]
+    pub const fn deny_recursive_tables(mut self, enabled: bool) -> Self {
+        self.options.deny_recursive_tables = enabled;
+        self
+    }
+
+    /// If true, keys in tables will be iterated (and serialized) in sorted order.
+    ///
+    /// Default: **false**
+    #[must_use]
+    pub const fn sort_keys(mut self, enabled: bool) -> Self {
+        self.options.sort_keys = enabled;
+        self
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl<'a, 'lua> Serialize for SerializableValue<'a, 'lua> {
     fn serialize<S>(&self, serializer: S) -> StdResult<S::Ok, S::Error>
     where
         S: Serializer,
     {
-        match self {
+        match self.value {
             Value::Nil => serializer.serialize_unit(),
             Value::Boolean(b) => serializer.serialize_bool(*b),
             #[allow(clippy::useless_conversion)]
@@ -305,21 +665,44 @@ impl<'lua> Serialize for Value<'lua> {
             #[cfg(feature = "luau")]
             Value::Vector(v) => v.serialize(serializer),
             Value::String(s) => s.serialize(serializer),
-            Value::Table(t) => t.serialize(serializer),
-            Value::UserData(ud) => ud.serialize(serializer),
+            Value::Table(t) => {
+                let visited = self.visited.as_ref().unwrap().clone();
+                SerializableTable::new(t, self.options, visited).serialize(serializer)
+            }
             Value::LightUserData(ud) if ud.0.is_null() => serializer.serialize_none(),
-            Value::Error(_) | Value::LightUserData(_) | Value::Function(_) | Value::Thread(_) => {
-                let msg = format!("cannot serialize <{}>", self.type_name());
-                Err(ser::Error::custom(msg))
+            Value::UserData(ud) if ud.is_serializable() || self.options.deny_unsupported_types => {
+                ud.serialize(serializer)
+            }
+            Value::Function(_)
+            | Value::Thread(_)
+            | Value::UserData(_)
+            | Value::LightUserData(_)
+            | Value::Error(_) => {
+                if self.options.deny_unsupported_types {
+                    let msg = format!("cannot serialize <{}>", self.value.type_name());
+                    Err(ser::Error::custom(msg))
+                } else {
+                    serializer.serialize_unit()
+                }
             }
         }
     }
 }
 
 /// Trait for types convertible to `Value`.
-pub trait IntoLua<'lua> {
+pub trait IntoLua<'lua>: Sized {
     /// Performs the conversion.
     fn into_lua(self, lua: &'lua Lua) -> Result<Value<'lua>>;
+
+    /// Pushes the value into the Lua stack.
+    ///
+    /// # Safety
+    /// This method does not check Lua stack space.
+    #[doc(hidden)]
+    #[inline]
+    unsafe fn push_into_stack(self, lua: &'lua Lua) -> Result<()> {
+        lua.push_value(self.into_lua(lua)?)
+    }
 }
 
 /// Trait for types convertible from `Value`.
@@ -332,13 +715,33 @@ pub trait FromLua<'lua>: Sized {
     /// `i` is the argument index (position),
     /// `to` is a function name that received the argument.
     #[doc(hidden)]
-    fn from_lua_arg(
-        value: Value<'lua>,
+    #[inline]
+    fn from_lua_arg(arg: Value<'lua>, i: usize, to: Option<&str>, lua: &'lua Lua) -> Result<Self> {
+        Self::from_lua(arg, lua).map_err(|err| Error::BadArgument {
+            to: to.map(|s| s.to_string()),
+            pos: i,
+            name: None,
+            cause: Arc::new(err),
+        })
+    }
+
+    /// Performs the conversion for a value in the Lua stack at index `idx`.
+    #[doc(hidden)]
+    #[inline]
+    unsafe fn from_stack(idx: c_int, lua: &'lua Lua) -> Result<Self> {
+        Self::from_lua(lua.stack_value(idx), lua)
+    }
+
+    /// Same as `from_lua_arg` but for a value in the Lua stack at index `idx`.
+    #[doc(hidden)]
+    #[inline]
+    unsafe fn from_stack_arg(
+        idx: c_int,
         i: usize,
         to: Option<&str>,
         lua: &'lua Lua,
     ) -> Result<Self> {
-        Self::from_lua(value, lua).map_err(|err| Error::BadArgument {
+        Self::from_stack(idx, lua).map_err(|err| Error::BadArgument {
             to: to.map(|s| s.to_string()),
             pos: i,
             name: None,
@@ -349,24 +752,43 @@ pub trait FromLua<'lua>: Sized {
 
 /// Multiple Lua values used for both argument passing and also for multiple return values.
 #[derive(Debug, Clone)]
-pub struct MultiValue<'lua>(Vec<Value<'lua>>);
+pub struct MultiValue<'lua> {
+    vec: Vec<Value<'lua>>,
+    lua: Option<&'lua Lua>,
+}
+
+impl Drop for MultiValue<'_> {
+    fn drop(&mut self) {
+        if let Some(lua) = self.lua {
+            let vec = mem::take(&mut self.vec);
+            lua.push_multivalue_to_pool(vec);
+        }
+    }
+}
 
 impl<'lua> MultiValue<'lua> {
     /// Creates an empty `MultiValue` containing no values.
     pub const fn new() -> MultiValue<'lua> {
-        MultiValue(Vec::new())
+        MultiValue {
+            vec: Vec::new(),
+            lua: None,
+        }
     }
 
-    /// Similar to `new` but can return previously used container with allocated capacity.
+    /// Similar to `new` but can reuse previously used container with allocated capacity.
     #[inline]
-    pub(crate) fn new_or_pooled(lua: &'lua Lua) -> MultiValue<'lua> {
-        lua.new_multivalue_from_pool()
-    }
-
-    /// Clears and returns previously allocated multivalue container to the pool.
-    #[inline]
-    pub(crate) fn return_to_pool(multivalue: Self, lua: &Lua) {
-        lua.return_multivalue_to_pool(multivalue);
+    pub(crate) fn with_lua_and_capacity(lua: &'lua Lua, capacity: usize) -> MultiValue<'lua> {
+        let vec = lua
+            .pop_multivalue_from_pool()
+            .map(|mut vec| {
+                vec.reserve(capacity);
+                vec
+            })
+            .unwrap_or_else(|| Vec::with_capacity(capacity));
+        MultiValue {
+            vec,
+            lua: Some(lua),
+        }
     }
 }
 
@@ -389,8 +811,10 @@ impl<'lua> IntoIterator for MultiValue<'lua> {
     type IntoIter = iter::Rev<vec::IntoIter<Value<'lua>>>;
 
     #[inline]
-    fn into_iter(self) -> Self::IntoIter {
-        self.0.into_iter().rev()
+    fn into_iter(mut self) -> Self::IntoIter {
+        let vec = mem::take(&mut self.vec);
+        mem::forget(self);
+        vec.into_iter().rev()
     }
 }
 
@@ -400,7 +824,7 @@ impl<'a, 'lua> IntoIterator for &'a MultiValue<'lua> {
 
     #[inline]
     fn into_iter(self) -> Self::IntoIter {
-        self.0.iter().rev()
+        self.vec.iter().rev()
     }
 }
 
@@ -423,64 +847,60 @@ impl<'lua> Index<usize> for MultiValue<'lua> {
 
 impl<'lua> MultiValue<'lua> {
     #[inline]
-    pub fn from_vec(mut v: Vec<Value<'lua>>) -> MultiValue<'lua> {
-        v.reverse();
-        MultiValue(v)
+    pub fn from_vec(mut vec: Vec<Value<'lua>>) -> MultiValue<'lua> {
+        vec.reverse();
+        MultiValue { vec, lua: None }
     }
 
     #[inline]
-    pub fn into_vec(self) -> Vec<Value<'lua>> {
-        let mut v = self.0;
-        v.reverse();
-        v
+    pub fn into_vec(mut self) -> Vec<Value<'lua>> {
+        let mut vec = mem::take(&mut self.vec);
+        mem::forget(self);
+        vec.reverse();
+        vec
     }
 
     #[inline]
     pub fn get(&self, index: usize) -> Option<&Value<'lua>> {
-        if index < self.0.len() {
-            return self.0.get(self.0.len() - index - 1);
+        if index < self.vec.len() {
+            return self.vec.get(self.vec.len() - index - 1);
         }
         None
     }
 
-    #[inline]
-    pub(crate) fn reserve(&mut self, size: usize) {
-        self.0.reserve(size);
-    }
-
     #[inline]
     pub fn pop_front(&mut self) -> Option<Value<'lua>> {
-        self.0.pop()
+        self.vec.pop()
     }
 
     #[inline]
     pub fn push_front(&mut self, value: Value<'lua>) {
-        self.0.push(value);
+        self.vec.push(value);
     }
 
     #[inline]
     pub fn clear(&mut self) {
-        self.0.clear();
+        self.vec.clear();
     }
 
     #[inline]
     pub fn len(&self) -> usize {
-        self.0.len()
+        self.vec.len()
     }
 
     #[inline]
     pub fn is_empty(&self) -> bool {
-        self.0.is_empty()
+        self.vec.is_empty()
     }
 
     #[inline]
     pub fn iter(&self) -> iter::Rev<slice::Iter<Value<'lua>>> {
-        self.0.iter().rev()
+        self.vec.iter().rev()
     }
 
     #[inline]
     pub(crate) fn drain_all(&mut self) -> iter::Rev<vec::Drain<Value<'lua>>> {
-        self.0.drain(..).rev()
+        self.vec.drain(..).rev()
     }
 
     #[inline]
@@ -488,11 +908,11 @@ impl<'lua> MultiValue<'lua> {
         &mut self,
         iter: impl IntoIterator<Item = Result<Value<'lua>>>,
     ) -> Result<()> {
-        self.0.clear();
+        self.vec.clear();
         for value in iter {
-            self.0.push(value?);
+            self.vec.push(value?);
         }
-        self.0.reverse();
+        self.vec.reverse();
         Ok(())
     }
 }
@@ -501,9 +921,26 @@ impl<'lua> MultiValue<'lua> {
 ///
 /// This is a generalization of `IntoLua`, allowing any number of resulting Lua values instead of just
 /// one. Any type that implements `IntoLua` will automatically implement this trait.
-pub trait IntoLuaMulti<'lua> {
+pub trait IntoLuaMulti<'lua>: Sized {
     /// Performs the conversion.
     fn into_lua_multi(self, lua: &'lua Lua) -> Result<MultiValue<'lua>>;
+
+    /// Pushes the values into the Lua stack.
+    ///
+    /// Returns number of pushed values.
+    #[doc(hidden)]
+    #[inline]
+    unsafe fn push_into_stack_multi(self, lua: &'lua Lua) -> Result<c_int> {
+        let mut values = self.into_lua_multi(lua)?;
+        let len: c_int = values.len().try_into().unwrap();
+        unsafe {
+            check_stack(lua.state(), len + 1)?;
+            for v in values.drain_all() {
+                lua.push_value(v)?;
+            }
+        }
+        Ok(len)
+    }
 }
 
 /// Trait for types that can be created from an arbitrary number of Lua values.
@@ -525,15 +962,43 @@ pub trait FromLuaMulti<'lua>: Sized {
     /// `to` is a function name that received the arguments.
     #[doc(hidden)]
     #[inline]
-    fn from_lua_multi_args(
-        values: MultiValue<'lua>,
+    fn from_lua_args(
+        args: MultiValue<'lua>,
         i: usize,
         to: Option<&str>,
         lua: &'lua Lua,
     ) -> Result<Self> {
         let _ = (i, to);
+        Self::from_lua_multi(args, lua)
+    }
+
+    /// Performs the conversion for a number of values in the Lua stack.
+    #[doc(hidden)]
+    #[inline]
+    unsafe fn from_stack_multi(nvals: c_int, lua: &'lua Lua) -> Result<Self> {
+        let mut values = MultiValue::with_lua_and_capacity(lua, nvals as usize);
+        for idx in 1..=nvals {
+            values.push_front(lua.stack_value(-idx));
+        }
+        if nvals > 0 {
+            // It's safe to clear the stack as all references moved to ref thread
+            ffi::lua_pop(lua.state(), nvals);
+        }
         Self::from_lua_multi(values, lua)
     }
+
+    /// Same as `from_lua_args` but for a number of values in the Lua stack.
+    #[doc(hidden)]
+    #[inline]
+    unsafe fn from_stack_args(
+        nargs: c_int,
+        i: usize,
+        to: Option<&str>,
+        lua: &'lua Lua,
+    ) -> Result<Self> {
+        let _ = (i, to);
+        Self::from_stack_multi(nargs, lua)
+    }
 }
 
 #[cfg(test)]

tests/async.rs

@@ -6,8 +6,8 @@ use std::time::Duration;
 use futures_util::stream::TryStreamExt;
 
 use mlua::{
-    AnyUserDataExt, Error, Function, Lua, LuaOptions, Result, StdLib, Table, TableExt, UserData,
-    UserDataMethods, Value,
+    AnyUserDataExt, Error, Function, Lua, LuaOptions, MultiValue, Result, StdLib, Table, TableExt,
+    UserData, UserDataMethods, Value,
 };
 
 async fn sleep_ms(ms: u64) {
@@ -82,6 +82,25 @@ async fn test_async_call() -> Result<()> {
     Ok(())
 }
 
+#[tokio::test]
+async fn test_async_call_many_returns() -> Result<()> {
+    let lua = Lua::new();
+
+    let hello = lua.create_async_function(|_lua, ()| async move {
+        sleep_ms(10).await;
+        Ok(("a", "b", "c", 1))
+    })?;
+
+    let vals = hello.call_async::<_, MultiValue>(()).await?;
+    assert_eq!(vals.len(), 4);
+    assert_eq!(vals[0].to_string()?, "a");
+    assert_eq!(vals[1].to_string()?, "b");
+    assert_eq!(vals[2].to_string()?, "c");
+    assert_eq!(vals[3], Value::Integer(1));
+
+    Ok(())
+}
+
 #[tokio::test]
 async fn test_async_bind_call() -> Result<()> {
     let lua = Lua::new();

tests/chunk.rs

@@ -36,12 +36,24 @@ fn test_chunk_macro() -> Result<()> {
     let data = lua.create_table()?;
     data.raw_set("num", 1)?;
 
+    let ud = mlua::AnyUserData::wrap("hello");
+    let f = mlua::Function::wrap(|_lua, ()| Ok(()));
+
     lua.globals().set("g", 123)?;
 
+    let string = String::new();
+    let str = string.as_str();
+
     lua.load(mlua::chunk! {
         assert($name == "Rustacean")
+        assert(type($table) == "table")
         assert($table[1] == 1)
+        assert(type($data) == "table")
         assert($data.num == 1)
+        assert(type($ud) == "userdata")
+        assert(type($f) == "function")
+        assert(type($str) == "string")
+        assert($str == "")
         assert(g == 123)
         s = 321
     })

tests/error.rs

@@ -41,7 +41,9 @@ fn test_error_context() -> Result<()> {
         .context("some new context")
     })?;
     let res = func3.call::<_, ()>(()).err().unwrap();
-    let Error::CallbackError { cause, .. } = &res else { unreachable!() };
+    let Error::CallbackError { cause, .. } = &res else {
+        unreachable!()
+    };
     assert!(!res.to_string().contains("some context"));
     assert!(res.to_string().contains("some new context"));
     assert!(cause.downcast_ref::<io::Error>().is_some());

tests/function.rs

@@ -86,7 +86,7 @@ fn test_rust_function() -> Result<()> {
 fn test_c_function() -> Result<()> {
     let lua = Lua::new();
 
-    unsafe extern "C" fn c_function(state: *mut mlua::lua_State) -> std::os::raw::c_int {
+    unsafe extern "C-unwind" fn c_function(state: *mut mlua::lua_State) -> std::os::raw::c_int {
         let lua = Lua::init_from_ptr(state);
         lua.globals().set("c_function", true).unwrap();
         0

tests/hooks.rs

@@ -1,6 +1,5 @@
 #![cfg(not(feature = "luau"))]
 
-use std::cell::RefCell;
 use std::ops::Deref;
 use std::sync::atomic::{AtomicI64, Ordering};
 use std::sync::{Arc, Mutex};
@@ -170,10 +169,13 @@ fn test_hook_removal() -> Result<()> {
     Ok(())
 }
 
+// Having the code compiled (even not run) on macos and luajit causes a memory reference issue
+// See https://github.com/LuaJIT/LuaJIT/issues/1099
+#[cfg(not(all(feature = "luajit", target_os = "macos")))]
 #[test]
 fn test_hook_swap_within_hook() -> Result<()> {
     thread_local! {
-        static TL_LUA: RefCell<Option<Lua>> = RefCell::new(None);
+        static TL_LUA: std::cell::RefCell<Option<Lua>> = Default::default();
     }
 
     TL_LUA.with(|tl| {

tests/luau.rs

@@ -1,6 +1,5 @@
 #![cfg(feature = "luau")]
 
-use std::env;
 use std::fmt::Debug;
 use std::fs;
 use std::panic::{catch_unwind, AssertUnwindSafe};
@@ -8,7 +7,8 @@ use std::sync::atomic::{AtomicU64, Ordering};
 use std::sync::Arc;
 
 use mlua::{
-    Compiler, CoverageInfo, Error, Lua, Result, Table, ThreadStatus, Value, Vector, VmState,
+    Compiler, CoverageInfo, Error, Lua, LuaOptions, Result, StdLib, Table, ThreadStatus, Value,
+    Vector, VmState,
 };
 
 #[test]
@@ -23,7 +23,12 @@ fn test_version() -> Result<()> {
 
 #[test]
 fn test_require() -> Result<()> {
-    let lua = Lua::new();
+    // Ensure that require() is not available if package module is not loaded
+    let mut lua = Lua::new_with(StdLib::NONE, LuaOptions::default())?;
+    assert!(lua.globals().get::<_, Option<Value>>("require")?.is_none());
+    assert!(lua.globals().get::<_, Option<Value>>("package")?.is_none());
+
+    lua = Lua::new();
 
     let temp_dir = tempfile::tempdir().unwrap();
     fs::write(
@@ -37,7 +42,10 @@ fn test_require() -> Result<()> {
     "#,
     )?;
 
-    env::set_var("LUAU_PATH", temp_dir.path().join("?.luau"));
+    lua.globals()
+        .get::<_, Table>("package")?
+        .set("path", temp_dir.path().join("?.luau").to_string_lossy())?;
+
     lua.load(
         r#"
         local module = require("module")
@@ -49,7 +57,28 @@ fn test_require() -> Result<()> {
         assert(not ok and string.find(err, "module.luau") ~= nil)
     "#,
     )
-    .exec()
+    .exec()?;
+
+    // Require non-existent module
+    match lua.load("require('non-existent')").exec() {
+        Err(Error::RuntimeError(e)) if e.contains("module 'non-existent' not found") => {}
+        r => panic!("expected RuntimeError(...) with a specific message, got {r:?}"),
+    }
+
+    // Require binary module in safe mode
+    lua.globals()
+        .get::<_, Table>("package")?
+        .set("cpath", temp_dir.path().join("?.so").to_string_lossy())?;
+    fs::write(temp_dir.path().join("dylib.so"), "")?;
+    match lua.load("require('dylib')").exec() {
+        Err(Error::RuntimeError(e)) if cfg!(unix) && e.contains("module 'dylib' not found") => {
+            assert!(e.contains("dynamic libraries are disabled in safe mode"))
+        }
+        Err(Error::RuntimeError(e)) if e.contains("module 'dylib' not found") => {}
+        r => panic!("expected RuntimeError(...) with a specific message, got {r:?}"),
+    }
+
+    Ok(())
 }
 
 #[cfg(not(feature = "luau-vector4"))]
@@ -84,7 +113,7 @@ fn test_vectors() -> Result<()> {
         assert(v.z == 3)
     "#,
     )
-    .set_compiler(Compiler::new().set_vector_ctor(Some("vector".to_string())))
+    .set_compiler(Compiler::new().set_vector_ctor("vector"))
     .exec()?;
 
     Ok(())
@@ -124,7 +153,49 @@ fn test_vectors() -> Result<()> {
         assert(v.w == 4)
     "#,
     )
-    .set_compiler(Compiler::new().set_vector_ctor(Some("vector".to_string())))
+    .set_compiler(Compiler::new().set_vector_ctor("vector"))
+    .exec()?;
+
+    Ok(())
+}
+
+#[cfg(all(not(feature = "luau-vector4"), feature = "unstable"))]
+#[test]
+fn test_vector_metatable() -> Result<()> {
+    let lua = Lua::new();
+
+    let vector_mt = lua
+        .load(
+            r#"
+            {
+                __index = {
+                    new = vector,
+
+                    product = function(a, b)
+                        return vector(a.x * b.x, a.y * b.y, a.z * b.z)
+                    end
+                }
+            }
+    "#,
+        )
+        .eval::<Table>()?;
+    vector_mt.set_metatable(Some(vector_mt.clone()));
+    lua.set_vector_metatable(Some(vector_mt.clone()));
+    lua.globals().set("Vector3", vector_mt)?;
+
+    let compiler = Compiler::new()
+        .set_vector_lib("Vector3")
+        .set_vector_ctor("new");
+
+    // Test vector methods (fastcall)
+    lua.load(
+        r#"
+        local v = Vector3.new(1, 2, 3)
+        local v2 = v:product(Vector3.new(2, 3, 4))
+        assert(v2.x == 2 and v2.y == 6 and v2.z == 12)
+    "#,
+    )
+    .set_compiler(compiler)
     .exec()?;
 
     Ok(())
@@ -365,3 +436,29 @@ fn test_coverage() -> Result<()> {
 
     Ok(())
 }
+
+#[test]
+fn test_buffer() -> Result<()> {
+    let lua = Lua::new();
+
+    let buf1 = lua
+        .load(
+            r#"
+        local buf = buffer.fromstring("hello")
+        assert(buffer.len(buf) == 5)
+        return buf
+    "#,
+        )
+        .eval::<Value>()?;
+    assert!(buf1.is_userdata() && buf1.is_buffer());
+    assert_eq!(buf1.type_name(), "buffer");
+
+    let buf2 = lua.load("buffer.fromstring('hello')").eval::<Value>()?;
+    assert_ne!(buf1, buf2);
+
+    // Check that we can pass buffer type to Lua
+    let func = lua.create_function(|_, buf: Value| return buf.to_string())?;
+    assert!(func.call::<_, String>(buf1)?.starts_with("buffer:"));
+
+    Ok(())
+}

tests/memory.rs

@@ -17,12 +17,8 @@ fn test_memory_limit() -> Result<()> {
         .into_function()?;
     f.call::<_, ()>(()).expect("should trigger no memory limit");
 
-    if cfg!(feature = "luajit") && cfg!(not(feature = "vendored")) {
-        // we don't support setting memory limit for non-vendored luajit
-        assert!(matches!(
-            lua.set_memory_limit(0),
-            Err(Error::MemoryLimitNotAvailable)
-        ));
+    if cfg!(feature = "luajit") && lua.set_memory_limit(0).is_err() {
+        // seems this luajit version does not support memory limit
         return Ok(());
     }
 
@@ -46,8 +42,8 @@ fn test_memory_limit_thread() -> Result<()> {
         .load("local t = {}; for i = 1,10000 do t[i] = i end")
         .into_function()?;
 
-    if cfg!(feature = "luajit") && cfg!(not(feature = "vendored")) {
-        // we don't support setting memory limit for non-vendored luajit
+    if cfg!(feature = "luajit") && lua.set_memory_limit(0).is_err() {
+        // seems this luajit version does not support memory limit
         return Ok(());
     }
 

tests/module/.cargo/config

@@ -1,11 +0,0 @@
-[target.x86_64-apple-darwin]
-rustflags = [
-  "-C", "link-arg=-undefined",
-  "-C", "link-arg=dynamic_lookup",
-]
-
-[target.aarch64-apple-darwin]
-rustflags = [
-  "-C", "link-arg=-undefined",
-  "-C", "link-arg=dynamic_lookup",
-]

tests/module/Cargo.toml

@@ -18,6 +18,7 @@ lua53 = ["mlua/lua53"]
 lua52 = ["mlua/lua52"]
 lua51 = ["mlua/lua51"]
 luajit = ["mlua/luajit"]
+luau = ["mlua/luau"]
 
 [dependencies]
 mlua = { path = "../..", features = ["module"] }

tests/module/build.rs

@@ -0,0 +1,7 @@
+fn main() {
+    #[cfg(target_os = "macos")]
+    {
+        println!("cargo:rustc-cdylib-link-arg=-undefined");
+        println!("cargo:rustc-cdylib-link-arg=dynamic_lookup");
+    }
+}

tests/module/loader/Cargo.toml

@@ -10,6 +10,7 @@ lua53 = ["mlua/lua53"]
 lua52 = ["mlua/lua52"]
 lua51 = ["mlua/lua51"]
 luajit = ["mlua/luajit"]
+luau = ["mlua/luau"]
 vendored = ["mlua/vendored"]
 
 [dependencies]

tests/module/loader/tests/load.rs

@@ -4,7 +4,7 @@ use std::path::PathBuf;
 use mlua::{Lua, Result};
 
 #[test]
-fn test_module() -> Result<()> {
+fn test_module_simple() -> Result<()> {
     let lua = make_lua()?;
     lua.load(
         r#"

tests/scope.rs

@@ -1,5 +1,6 @@
 use std::cell::Cell;
 use std::rc::Rc;
+use std::string::String as StdString;
 use std::sync::Arc;
 
 use mlua::{
@@ -76,6 +77,7 @@ fn test_scope_userdata_fields() -> Result<()> {
 
     impl<'a> UserData for MyUserData<'a> {
         fn add_fields<'lua, F: UserDataFields<'lua, Self>>(fields: &mut F) {
+            fields.add_field("field", "hello");
             fields.add_field_method_get("val", |_, data| Ok(data.0.get()));
             fields.add_field_method_set("val", |_, data, val| {
                 data.0.set(val);
@@ -91,6 +93,7 @@ fn test_scope_userdata_fields() -> Result<()> {
         .load(
             r#"
             function(u)
+                assert(u.field == "hello")
                 assert(u.val == 42)
                 u.val = 44
             end
@@ -227,9 +230,19 @@ fn test_scope_userdata_mismatch() -> Result<()> {
         let bu = scope.create_nonstatic_userdata(MyUserData(&b))?;
         assert!(okay.call::<_, ()>((au.clone(), bu.clone())).is_ok());
         match bad.call::<_, ()>((au, bu)) {
-            Err(Error::CallbackError { ref cause, .. }) => match *cause.as_ref() {
-                Error::UserDataTypeMismatch => {}
-                ref other => panic!("wrong error type {:?}", other),
+            Err(Error::CallbackError { ref cause, .. }) => match cause.as_ref() {
+                Error::BadArgument {
+                    to,
+                    pos,
+                    name,
+                    cause,
+                } => {
+                    assert_eq!(to.as_deref(), Some("MyUserData.inc"));
+                    assert_eq!(*pos, 1);
+                    assert_eq!(name.as_deref(), Some("self"));
+                    assert!(matches!(*cause.as_ref(), Error::UserDataTypeMismatch));
+                }
+                other => panic!("wrong error type {:?}", other),
             },
             Err(other) => panic!("wrong error type {:?}", other),
             Ok(_) => panic!("incorrectly returned Ok"),
@@ -417,6 +430,32 @@ fn test_scope_userdata_ref_mut() -> Result<()> {
     Ok(())
 }
 
+#[test]
+fn test_scope_any_userdata() -> Result<()> {
+    let lua = Lua::new();
+
+    lua.register_userdata_type::<StdString>(|reg| {
+        reg.add_meta_method("__tostring", |_, data, ()| Ok(data.clone()));
+    })?;
+
+    lua.scope(|scope| {
+        let ud = scope.create_any_userdata(StdString::from("foo"))?;
+        lua.globals().set("ud", ud)?;
+        lua.load("assert(tostring(ud) == 'foo')").exec()
+    })?;
+
+    // Check that userdata is destructed
+    match lua.load("tostring(ud)").exec() {
+        Err(Error::CallbackError { ref cause, .. }) => match cause.as_ref() {
+            Error::CallbackDestructed => {}
+            err => panic!("expected CallbackDestructed, got {:?}", err),
+        },
+        r => panic!("improper return for destructed userdata: {:?}", r),
+    };
+
+    Ok(())
+}
+
 #[test]
 fn test_scope_any_userdata_ref() -> Result<()> {
     let lua = Lua::new();

tests/serde.rs

@@ -4,8 +4,8 @@ use std::collections::HashMap;
 use std::error::Error as StdError;
 
 use mlua::{
-    DeserializeOptions, Error, Lua, LuaSerdeExt, Result as LuaResult, SerializeOptions, UserData,
-    Value,
+    DeserializeOptions, Error, ExternalResult, Lua, LuaSerdeExt, Result as LuaResult,
+    SerializeOptions, UserData, Value,
 };
 use serde::{Deserialize, Serialize};
 
@@ -191,6 +191,69 @@ fn test_serialize_vector() -> Result<(), Box<dyn StdError>> {
     Ok(())
 }
 
+#[test]
+fn test_serialize_sorted() -> LuaResult<()> {
+    let lua = Lua::new();
+
+    let globals = lua.globals();
+    globals.set("null", lua.null())?;
+
+    let empty_array = lua.create_table()?;
+    empty_array.set_metatable(Some(lua.array_metatable()));
+    globals.set("empty_array", empty_array)?;
+
+    let value = lua
+        .load(
+            r#"
+        {
+            _bool = true,
+            _integer = 123,
+            _number = 321.99,
+            _string = "test string serialization",
+            _table_arr = {nil, "value 1", nil, "value 2", {}},
+            _table_map = {["table"] = "map", ["null"] = null},
+            _bytes = "\240\040\140\040",
+            _null = null,
+            _empty_map = {},
+            _empty_array = empty_array,
+        }
+    "#,
+        )
+        .eval::<Value>()?;
+
+    let json = serde_json::to_string(&value.to_serializable().sort_keys(true)).unwrap();
+    assert_eq!(
+        json,
+        r#"{"_bool":true,"_bytes":[240,40,140,40],"_empty_array":[],"_empty_map":{},"_integer":123,"_null":null,"_number":321.99,"_string":"test string serialization","_table_arr":[null,"value 1",null,"value 2",{}],"_table_map":{"null":null,"table":"map"}}"#
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_serialize_globals() -> LuaResult<()> {
+    let lua = Lua::new();
+
+    let globals = Value::Table(lua.globals());
+
+    // By default it should not work
+    if let Ok(v) = serde_json::to_value(&globals) {
+        panic!("expected serialization error, got {v:?}");
+    }
+
+    // It should work with `deny_recursive_tables` and `deny_unsupported_types` disabled
+    if let Err(err) = serde_json::to_value(
+        globals
+            .to_serializable()
+            .deny_recursive_tables(false)
+            .deny_unsupported_types(false),
+    ) {
+        panic!("expected no errors, got {err:?}");
+    }
+
+    Ok(())
+}
+
 #[test]
 fn test_to_value_struct() -> LuaResult<()> {
     let lua = Lua::new();
@@ -611,3 +674,26 @@ fn test_from_value_userdata() -> Result<(), Box<dyn StdError>> {
 
     Ok(())
 }
+
+#[test]
+fn test_from_value_sorted() -> Result<(), Box<dyn StdError>> {
+    let lua = Lua::new();
+
+    let to_json = lua.create_function(|lua, value| {
+        let json_value: serde_json::Value =
+            lua.from_value_with(value, DeserializeOptions::new().sort_keys(true))?;
+        serde_json::to_string(&json_value).into_lua_err()
+    })?;
+    lua.globals().set("to_json", to_json)?;
+
+    lua.load(
+        r#"
+        local json = to_json({c = 3, b = 2, hello = "world", x = {1}, ["0a"] = {z = "z", d = "d"}})
+        assert(json == '{"0a":{"d":"d","z":"z"},"b":2,"c":3,"hello":"world","x":[1]}', "invalid json")
+    "#,
+    )
+    .exec()
+    .unwrap();
+
+    Ok(())
+}

tests/table.rs

@@ -217,6 +217,74 @@ fn test_table_sequence_from() -> Result<()> {
     Ok(())
 }
 
+#[test]
+fn test_table_pairs() -> Result<()> {
+    let lua = Lua::new();
+
+    let table = lua
+        .load(
+            r#"
+    {
+        foo = "bar",
+        baz = "baf",
+        [123] = 456,
+        [789] = 101112,
+        5,
+    }
+    "#,
+        )
+        .eval::<Table>()?;
+
+    let table2 = table.clone();
+    for (i, kv) in table.pairs::<String, Value>().enumerate() {
+        let (k, _v) = kv.unwrap();
+        match i {
+            // Try to add a new key
+            0 => table2.set("new_key", "new_value")?,
+            // Try to delete the 2nd key
+            1 => {
+                table2.set(k, Value::Nil)?;
+                lua.gc_collect()?;
+            }
+            _ => {}
+        }
+    }
+
+    Ok(())
+}
+
+#[test]
+fn test_table_for_each() -> Result<()> {
+    let lua = Lua::new();
+
+    let table = lua
+        .load(
+            r#"
+    {
+        foo = "bar",
+        baz = "baf",
+        [123] = 456,
+        [789] = 101112,
+        5,
+    }
+    "#,
+        )
+        .eval::<Table>()?;
+
+    let mut i = 0;
+    table.for_each::<String, Value>(|k, _| {
+        if i == 0 {
+            // Delete first key
+            table.set(k, Value::Nil)?;
+            lua.gc_collect()?;
+        }
+        Ok(i += 1)
+    })?;
+    assert_eq!(i, 5);
+
+    Ok(())
+}
+
 #[test]
 fn test_table_scope() -> Result<()> {
     let lua = Lua::new();

tests/tests.rs

@@ -69,7 +69,7 @@ fn test_safety() -> Result<()> {
 fn test_load() -> Result<()> {
     let lua = Lua::new();
 
-    let func = lua.load("return 1+2").into_function()?;
+    let func = lua.load("\treturn 1+2").into_function()?;
     let result: i32 = func.call(())?;
     assert_eq!(result, 3);
 
@@ -504,25 +504,32 @@ fn test_result_conversions() -> Result<()> {
     let lua = Lua::new();
     let globals = lua.globals();
 
-    let err = lua.create_function(|_, ()| {
-        Ok(Err::<String, _>(
-            "only through failure can we succeed".into_lua_err(),
-        ))
-    })?;
-    let ok = lua.create_function(|_, ()| Ok(Ok::<_, Error>("!".to_owned())))?;
+    let ok = lua.create_function(|_, ()| Ok(Ok::<(), Error>(())))?;
+    let err = lua.create_function(|_, ()| Ok(Err::<(), _>("failure1".into_lua_err())))?;
+    let ok2 = lua.create_function(|_, ()| Ok(Ok::<_, Error>("!".to_owned())))?;
+    let err2 = lua.create_function(|_, ()| Ok(Err::<String, _>("failure2".into_lua_err())))?;
 
-    globals.set("err", err)?;
     globals.set("ok", ok)?;
+    globals.set("ok2", ok2)?;
+    globals.set("err", err)?;
+    globals.set("err2", err2)?;
 
     lua.load(
         r#"
+        local r, e = ok()
+        assert(r == nil and e == nil)
+
         local r, e = err()
         assert(r == nil)
-        assert(tostring(e):find("only through failure can we succeed") ~= nil)
+        assert(tostring(e):find("failure1") ~= nil)
 
-        local r, e = ok()
+        local r, e = ok2()
         assert(r == "!")
         assert(e == nil)
+
+        local r, e = err2()
+        assert(r == nil)
+        assert(tostring(e):find("failure2") ~= nil)
     "#,
     )
     .exec()?;
@@ -1318,10 +1325,10 @@ fn test_warnings() -> Result<()> {
 
 #[test]
 #[cfg(feature = "luajit")]
-#[should_panic]
-fn test_luajit_cdata() {
+fn test_luajit_cdata() -> Result<()> {
     let lua = unsafe { Lua::unsafe_new() };
-    let _v: Result<Value> = lua
+
+    let cdata = lua
         .load(
             r#"
         local ffi = require("ffi")
@@ -1334,7 +1341,12 @@ fn test_luajit_cdata() {
         return ptr
     "#,
         )
-        .eval();
+        .eval::<Value>()?;
+    assert!(cdata.is_userdata() && cdata.is_cdata());
+    assert_eq!(cdata.type_name(), "cdata");
+    assert!(cdata.to_string()?.starts_with("cdata<void *>:"));
+
+    Ok(())
 }
 
 #[test]

tests/thread.rs

@@ -94,11 +94,7 @@ fn test_thread() -> Result<()> {
 }
 
 #[test]
-#[cfg(any(
-    feature = "lua54",
-    all(feature = "luajit", feature = "vendored"),
-    feature = "luau",
-))]
+#[cfg(any(feature = "lua54", feature = "luau"))]
 fn test_thread_reset() -> Result<()> {
     use mlua::{AnyUserData, UserData};
     use std::sync::Arc;
@@ -194,3 +190,34 @@ fn test_coroutine_panic() {
         Err(p) => assert!(*p.downcast::<&str>().unwrap() == "test_panic"),
     }
 }
+
+#[cfg(all(feature = "unstable", not(feature = "send")))]
+#[test]
+fn test_owned_thread() -> Result<()> {
+    let lua = Lua::new();
+
+    let accumulate = lua
+        .create_thread(
+            lua.load(
+                r#"
+            function (sum)
+                while true do
+                    sum = sum + coroutine.yield(sum)
+                end
+            end
+            "#,
+            )
+            .eval::<Function>()?,
+        )?
+        .into_owned();
+
+    for i in 0..4 {
+        accumulate.resume::<_, ()>(i)?;
+    }
+    assert_eq!(accumulate.resume::<_, i64>(4)?, 10);
+    assert_eq!(accumulate.status(), ThreadStatus::Resumable);
+    assert!(accumulate.resume::<_, ()>("error").is_err());
+    assert_eq!(accumulate.status(), ThreadStatus::Error);
+
+    Ok(())
+}

tests/userdata.rs

@@ -15,7 +15,7 @@ use std::sync::atomic::{AtomicI64, Ordering};
 
 use mlua::{
     AnyUserData, AnyUserDataExt, Error, ExternalError, Function, Lua, MetaMethod, Nil, Result,
-    String, UserData, UserDataFields, UserDataMethods, UserDataRef, Value,
+    String, UserData, UserDataFields, UserDataMethods, UserDataRef, Value, Variadic,
 };
 
 #[test]
@@ -92,6 +92,30 @@ fn test_methods() -> Result<()> {
     Ok(())
 }
 
+#[test]
+fn test_method_variadic() -> Result<()> {
+    struct MyUserData(i64);
+
+    impl UserData for MyUserData {
+        fn add_methods<'lua, M: UserDataMethods<'lua, Self>>(methods: &mut M) {
+            methods.add_method("get", |_, data, ()| Ok(data.0));
+            methods.add_method_mut("add", |_, data, vals: Variadic<i64>| {
+                data.0 += vals.into_iter().sum::<i64>();
+                Ok(())
+            });
+        }
+    }
+
+    let lua = Lua::new();
+    let globals = lua.globals();
+    globals.set("userdata", MyUserData(0))?;
+    lua.load("userdata:add(1, 5, -10)").exec()?;
+    let ud: UserDataRef<MyUserData> = globals.get("userdata")?;
+    assert_eq!(ud.0, -4);
+
+    Ok(())
+}
+
 #[test]
 fn test_metamethods() -> Result<()> {
     #[derive(Copy, Clone)]
@@ -482,6 +506,9 @@ fn test_functions() -> Result<()> {
 
 #[test]
 fn test_fields() -> Result<()> {
+    let lua = Lua::new();
+    let globals = lua.globals();
+
     #[derive(Copy, Clone)]
     struct MyUserData(i64);
 
@@ -509,8 +536,6 @@ fn test_fields() -> Result<()> {
         }
     }
 
-    let lua = Lua::new();
-    let globals = lua.globals();
     globals.set("ud", MyUserData(7))?;
     lua.load(
         r#"
@@ -531,6 +556,33 @@ fn test_fields() -> Result<()> {
     )
     .exec()?;
 
+    // Case: fields + __index metamethod (function)
+    struct MyUserData2(i64);
+
+    impl UserData for MyUserData2 {
+        fn add_fields<'lua, F: UserDataFields<'lua, Self>>(fields: &mut F) {
+            fields.add_field("z", 0);
+            fields.add_field_method_get("x", |_, data| Ok(data.0));
+        }
+
+        fn add_methods<'lua, M: UserDataMethods<'lua, Self>>(methods: &mut M) {
+            methods.add_meta_method(MetaMethod::Index, |_, _, name: StdString| match &*name {
+                "y" => Ok(Some(-1)),
+                _ => Ok(None),
+            });
+        }
+    }
+
+    globals.set("ud", MyUserData2(1))?;
+    lua.load(
+        r#"
+        assert(ud.x == 1)
+        assert(ud.y == -1)
+        assert(ud.z == 0)
+    "#,
+    )
+    .exec()?;
+
     Ok(())
 }
 
@@ -543,7 +595,7 @@ fn test_metatable() -> Result<()> {
         fn add_methods<'lua, M: UserDataMethods<'lua, Self>>(methods: &mut M) {
             methods.add_function("my_type_name", |_, data: AnyUserData| {
                 let metatable = data.get_metatable()?;
-                metatable.get::<String>("__name")
+                metatable.get::<String>(MetaMethod::Type)
             });
         }
     }
@@ -554,6 +606,12 @@ fn test_metatable() -> Result<()> {
     lua.load(r#"assert(ud:my_type_name() == "MyUserData")"#)
         .exec()?;
 
+    #[cfg(any(feature = "lua54", feature = "lua53", feature = "luau"))]
+    lua.load(r#"assert(tostring(ud):sub(1, 11) == "MyUserData:")"#)
+        .exec()?;
+    #[cfg(feature = "luau")]
+    lua.load(r#"assert(typeof(ud) == "MyUserData")"#).exec()?;
+
     let ud: AnyUserData = globals.get("ud")?;
     let metatable = ud.get_metatable()?;
 
@@ -574,7 +632,7 @@ fn test_metatable() -> Result<()> {
         .map(|kv: Result<(_, Value)>| Ok(kv?.0))
         .collect::<Result<Vec<_>>>()?;
     methods.sort();
-    assert_eq!(methods, vec!["__index", "__name"]);
+    assert_eq!(methods, vec!["__index", MetaMethod::Type.name()]);
 
     #[derive(Copy, Clone)]
     struct MyUserData2;
@@ -596,13 +654,16 @@ fn test_metatable() -> Result<()> {
 
     impl UserData for MyUserData3 {
         fn add_fields<'lua, F: UserDataFields<'lua, Self>>(fields: &mut F) {
-            fields.add_meta_field_with("__name", |_| Ok("CustomName"));
+            fields.add_meta_field_with(MetaMethod::Type, |_| Ok("CustomName"));
         }
     }
 
     let ud = lua.create_userdata(MyUserData3)?;
     let metatable = ud.get_metatable()?;
-    assert_eq!(metatable.get::<String>("__name")?.to_str()?, "CustomName");
+    assert_eq!(
+        metatable.get::<String>(MetaMethod::Type)?.to_str()?,
+        "CustomName"
+    );
 
     Ok(())
 }
@@ -908,3 +969,39 @@ fn test_owned_userdata() -> Result<()> {
 
     Ok(())
 }
+
+#[cfg(feature = "macros")]
+#[test]
+fn test_userdata_derive() -> Result<()> {
+    let lua = Lua::new();
+
+    // Simple struct
+
+    #[derive(Clone, Copy, mlua::FromLua)]
+    struct MyUserData(i32);
+
+    lua.register_userdata_type::<MyUserData>(|reg| {
+        reg.add_function("val", |_, this: MyUserData| Ok(this.0));
+    })?;
+
+    lua.globals()
+        .set("ud", AnyUserData::wrap(MyUserData(123)))?;
+    lua.load("assert(ud:val() == 123)").exec()?;
+
+    // More complex struct where generics and where clause
+
+    #[derive(Clone, Copy, mlua::FromLua)]
+    struct MyUserData2<'a, T>(&'a T)
+    where
+        T: ?Sized;
+
+    lua.register_userdata_type::<MyUserData2<'static, i32>>(|reg| {
+        reg.add_function("val", |_, this: MyUserData2<'static, i32>| Ok(*this.0));
+    })?;
+
+    lua.globals()
+        .set("ud", AnyUserData::wrap(MyUserData2(&321)))?;
+    lua.load("assert(ud:val() == 321)").exec()?;
+
+    Ok(())
+}

tests/value.rs

@@ -158,3 +158,74 @@ fn test_debug_format() -> Result<()> {
 
     Ok(())
 }
+
+#[test]
+fn test_value_conversions() -> Result<()> {
+    let lua = Lua::new();
+
+    assert!(Value::Nil.is_nil());
+    assert!(!Value::NULL.is_nil());
+    assert!(Value::NULL.is_null());
+    assert!(Value::NULL.is_light_userdata());
+    assert!(Value::NULL.as_light_userdata() == Some(LightUserData(ptr::null_mut())));
+    assert!(Value::Boolean(true).is_boolean());
+    assert_eq!(Value::Boolean(false).as_boolean(), Some(false));
+    assert!(Value::Integer(1).is_integer());
+    assert_eq!(Value::Integer(1).as_integer(), Some(1));
+    assert_eq!(Value::Integer(1).as_i32(), Some(1i32));
+    assert_eq!(Value::Integer(1).as_u32(), Some(1u32));
+    assert_eq!(Value::Integer(1).as_i64(), Some(1i64));
+    assert_eq!(Value::Integer(1).as_u64(), Some(1u64));
+    #[cfg(any(feature = "lua54", feature = "lua53"))]
+    {
+        assert_eq!(Value::Integer(mlua::Integer::MAX).as_i32(), None);
+        assert_eq!(Value::Integer(mlua::Integer::MAX).as_u32(), None);
+    }
+    assert_eq!(Value::Integer(1).as_isize(), Some(1isize));
+    assert_eq!(Value::Integer(1).as_usize(), Some(1usize));
+    assert!(Value::Number(1.23).is_number());
+    assert_eq!(Value::Number(1.23).as_number(), Some(1.23));
+    assert_eq!(Value::Number(1.23).as_f32(), Some(1.23f32));
+    assert_eq!(Value::Number(1.23).as_f64(), Some(1.23f64));
+    assert!(Value::String(lua.create_string("hello")?).is_string());
+    assert_eq!(
+        Value::String(lua.create_string("hello")?)
+            .as_string()
+            .unwrap(),
+        "hello"
+    );
+    assert_eq!(
+        Value::String(lua.create_string("hello")?).as_str().unwrap(),
+        "hello"
+    );
+    assert_eq!(
+        Value::String(lua.create_string("hello")?)
+            .as_string_lossy()
+            .unwrap(),
+        "hello"
+    );
+    assert!(Value::Table(lua.create_table()?).is_table());
+    assert!(Value::Table(lua.create_table()?).as_table().is_some());
+    assert!(Value::Function(lua.create_function(|_, ()| Ok(())).unwrap()).is_function());
+    assert!(
+        Value::Function(lua.create_function(|_, ()| Ok(())).unwrap())
+            .as_function()
+            .is_some()
+    );
+    assert!(Value::Thread(lua.create_thread(lua.load("function() end").eval()?)?).is_thread());
+    assert!(
+        Value::Thread(lua.create_thread(lua.load("function() end").eval()?)?)
+            .as_thread()
+            .is_some()
+    );
+    assert!(Value::UserData(lua.create_any_userdata("hello")?).is_userdata());
+    assert_eq!(
+        Value::UserData(lua.create_any_userdata("hello")?)
+            .as_userdata()
+            .and_then(|ud| ud.borrow::<&str>().ok())
+            .as_deref(),
+        Some(&"hello")
+    );
+
+    Ok(())
+}