forked from AbleOS/holey-bytes
195 lines
5.3 KiB
Rust
195 lines
5.3 KiB
Rust
use {
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crate::arraylist::ArrayList,
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mlua::{prelude::*, Result, Scope},
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};
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mod opsty {
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pub type R = i8;
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pub type B = i8;
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pub type H = i16;
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pub type W = i32;
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pub type D = i64;
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pub type A = i64;
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pub type O<'lua> = super::LuaValue<'lua>;
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pub type P<'lua> = super::LuaValue<'lua>;
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}
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macro_rules! gen_insert {
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($($plain:ident),* $(,)?) => {
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macro_rules! insert {
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$(
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($label:expr, $lua:expr, $symrt:expr, $code:expr, $plain) => {
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$code.0.extend($label.to_le_bytes());
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};
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)*
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($label:expr, $lua:expr, $symrt:expr, $code:expr, O) => {
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insert_label_ref::<4>(
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$label,
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$lua,
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&$symrt,
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&mut $code.0,
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)?;
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};
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($label:expr, $lua:expr, $symrt:expr, $code:expr, P) => {
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insert_label_ref::<2>(
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$label,
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$lua,
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&$symrt,
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&mut $code.0,
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)?;
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};
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}
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};
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}
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gen_insert!(R, B, H, W, D, A);
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macro_rules! generic_ins {
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{
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($lua:expr, $scope:expr);
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$($name:ident($($param_i:ident : $param_ty:ident),*);)*
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} => {{
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let lua = $lua;
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let scope = $scope;
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let code = $lua.globals()
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.get::<_, LuaTable>("_CODE")?
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.get::<_, LuaAnyUserData>("text")?;
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let symrt = $lua.globals()
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.get::<_, LuaTable>("_SYM_REPLS")?;
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lua.globals().set(
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"_GENERIC",
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lua.create_table_from([$((
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stringify!($name),
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#[allow(unused)]
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{
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let code = code.clone();
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let symrt = symrt.clone();
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scope.create_function_mut(move |lua, (opcode, $($param_i),*): (u8, $(opsty::$param_ty),*)| {
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let mut code = code.borrow_mut::<ArrayList<u8>>()?;
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code.0.push(opcode);
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$(insert!($param_i, lua, symrt, code, $param_ty);)*
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Ok(())
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})?
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}
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)),*])?
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)?;
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}};
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}
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macro_rules! ins {
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{
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$lua:expr;
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{$($opcode:expr, $mnemonic:ident, $ty:ident, $_doc:literal;)*}
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} => {{
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use std::fmt::Write;
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let lua = $lua;
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let mut code = String::new();
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$({
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paste::paste! {
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let name = match stringify!([<$mnemonic:lower>]) {
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"and" => "and_",
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"or" => "or_",
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"not" => "not_",
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name => name,
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};
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}
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writeln!(
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code,
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"function {name}(...) _GENERIC.{ty}({opcode}, ...) end",
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ty = stringify!($ty).to_lowercase(),
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opcode = $opcode,
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).unwrap();
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})*
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lua.load(code).exec()?;
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}};
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}
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pub fn setup<'lua, 'scope>(lua: &'lua Lua, scope: &Scope<'lua, 'scope>) -> Result<()>
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where
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'lua: 'scope,
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{
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generic_ins! {
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(lua, scope);
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rr (o0: R, o1: R);
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rrr (o0: R, o1: R, o2: R);
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rrrr(o0: R, o1: R, o2: R, o3: R);
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rrb (o0: R, o1: R, o2: B);
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rrh (o0: R, o1: R, o2: H);
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rrw (o0: R, o1: R, o2: W);
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rrd (o0: R, o1: R, o2: D);
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rb (o0: R, o1: B);
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rh (o0: R, o1: H);
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rw (o0: R, o1: W);
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rd (o0: R, o1: D);
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rrah(o0: R, o1: R, o2: A, o3: H);
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rroh(o0: R, o1: R, o2: O, o3: H);
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rrph(o0: R, o1: R, o2: P, o3: H);
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rro (o0: R, o1: R, o2: O);
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rrp (o0: R, o1: R, r2: P);
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o (o0: O);
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p (o0: P);
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n ();
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}
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with_builtin_macros::with_builtin! {
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let $spec = include_from_root!("../hbbytecode/instructions.in") in {
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ins!(lua; { $spec });
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}
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}
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Ok(())
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}
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fn insert_label_ref<const SIZE: usize>(
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label: LuaValue,
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lua: &Lua,
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symrt: &LuaTable,
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code: &mut Vec<u8>,
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) -> Result<()> {
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match label {
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LuaValue::Integer(offset) => {
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if match SIZE {
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2 => i16::try_from(offset).map(|o| code.extend(o.to_le_bytes())),
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4 => i32::try_from(offset).map(|o| code.extend(o.to_le_bytes())),
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s => {
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return Err(mlua::Error::runtime(format!(
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"Invalid offset size (expected 2 or 4 bytes, got {s})"
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)));
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}
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}
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.is_err()
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{
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return Err(mlua::Error::runtime("Failed to cast offset"));
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}
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return Ok(());
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}
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LuaValue::UserData(ud) => {
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symrt.set(
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code.len() + 1,
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lua.create_table_from([("label", ud.get("id")?), ("size", SIZE)])?,
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)?;
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code.extend([0; SIZE]);
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}
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LuaValue::String(_) => {
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symrt.set(
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code.len() + 1,
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lua.create_table_from([("label", label), ("size", SIZE.into_lua(lua)?)])?,
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)?;
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code.extend([0; SIZE]);
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}
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_ => return Err(mlua::Error::runtime("Invalid label type")),
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}
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Ok(())
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}
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