forked from AbleOS/holey-bytes
278 lines
10 KiB
Rust
278 lines
10 KiB
Rust
#![no_std]
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#![feature(error_in_core)]
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// use std::collections::HashMap;
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extern crate alloc;
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use alloc::vec::Vec;
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use {
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core::fmt::{Display, Formatter},
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hashbrown::HashMap,
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lasso::{Rodeo, Spur},
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logos::{Lexer, Logos, Span},
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};
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macro_rules! tokendef {
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($($opcode:literal),* $(,)?) => {
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paste::paste! {
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#[derive(Clone, Copy, Debug, PartialEq, Eq, Logos)]
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#[logos(extras = Rodeo)]
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#[logos(skip r"[ \t\f]+")]
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#[logos(skip r"-- .*")]
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pub enum Token {
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$(#[token($opcode, |_| hbbytecode::opcode::[<$opcode:upper>])])*
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OpCode(u8),
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#[regex("[0-9]+", |l| l.slice().parse().ok())]
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#[regex(
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"-[0-9]+",
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|lexer| {
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Some(u64::from_ne_bytes(lexer.slice().parse::<i64>().ok()?.to_ne_bytes()))
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},
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)] Integer(u64),
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#[regex(
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"r[0-9]+",
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|lexer| match lexer.slice()[1..].parse() {
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Ok(n) => Some(n),
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_ => None
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},
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)] Register(u8),
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#[regex(
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r"\p{XID_Start}\p{XID_Continue}*:",
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|lexer| lexer.extras.get_or_intern(&lexer.slice()[..lexer.slice().len() - 1]),
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)] Label(Spur),
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#[regex(
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r"\p{XID_Start}\p{XID_Continue}*",
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|lexer| lexer.extras.get_or_intern(lexer.slice()),
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)] Symbol(Spur),
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#[token("\n")]
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#[token(";")] ISep,
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#[token(",")] PSep,
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}
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}
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};
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}
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#[rustfmt::skip]
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tokendef![
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"nop", "add", "sub", "mul", "and", "or", "xor", "sl", "sr", "srs", "cmp", "cmpu",
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"dir", "neg", "not", "addi", "muli", "andi", "ori", "xori", "sli", "sri", "srsi",
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"cmpi", "cmpui", "cp", "swa", "li", "ld", "st", "bmc", "brc", "jmp", "jeq", "jne",
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"jlt", "jgt", "jltu", "jgtu", "ecall", "addf", "subf", "mulf", "dirf", "fmaf", "negf",
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"itf", "fti", "addfi", "mulfi",
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];
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub enum ErrorKind {
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UnexpectedToken,
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InvalidToken,
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UnexpectedEnd,
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InvalidSymbol,
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}
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#[derive(Clone, Debug, PartialEq, Eq)]
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pub struct Error {
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pub kind: ErrorKind,
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pub span: Span,
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}
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impl Display for Error {
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fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
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write!(f, "Error {:?} at {:?}", self.kind, self.span)
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}
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}
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impl core::error::Error for Error {}
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macro_rules! expect_matches {
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($self:expr, $($pat:pat),* $(,)?) => {$(
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let $pat = $self.next()?
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else { return Err(ErrorKind::UnexpectedToken) };
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)*}
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}
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pub fn assembly(code: &str, buf: &mut Vec<u8>) -> Result<(), Error> {
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struct Assembler<'a> {
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lexer: Lexer<'a, Token>,
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buf: &'a mut Vec<u8>,
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label_map: HashMap<Spur, u64>,
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to_sub_label: HashMap<usize, Spur>,
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}
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impl<'a> Assembler<'a> {
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fn next(&mut self) -> Result<Token, ErrorKind> {
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match self.lexer.next() {
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Some(Ok(t)) => Ok(t),
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Some(Err(())) => Err(ErrorKind::InvalidToken),
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None => Err(ErrorKind::UnexpectedEnd),
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}
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}
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fn assemble(&mut self) -> Result<(), ErrorKind> {
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use hbbytecode::opcode::*;
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loop {
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match self.lexer.next() {
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Some(Ok(Token::OpCode(op))) => {
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self.buf.push(op);
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match op {
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NOP | ECALL => Ok(()),
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DIR | DIRF => {
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expect_matches!(
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self,
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Token::Register(r0),
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Token::PSep,
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Token::Register(r1),
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Token::PSep,
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Token::Register(r2),
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Token::PSep,
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Token::Register(r3),
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);
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self.buf.extend([r0, r1, r2, r3]);
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Ok(())
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}
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ADD..=CMPU | ADDF..=MULF => {
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expect_matches!(
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self,
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Token::Register(r0),
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Token::PSep,
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Token::Register(r1),
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Token::PSep,
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Token::Register(r2),
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);
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self.buf.extend([r0, r1, r2]);
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Ok(())
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}
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BRC => {
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expect_matches!(
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self,
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Token::Register(r0),
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Token::PSep,
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Token::Register(r1),
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Token::PSep,
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Token::Integer(count),
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);
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self.buf.extend([
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r0,
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r1,
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u8::try_from(count).map_err(|_| ErrorKind::UnexpectedToken)?,
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]);
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Ok(())
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}
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NEG..=NOT | CP..=SWA | NEGF..=FTI => {
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expect_matches!(
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self,
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Token::Register(r0),
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Token::PSep,
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Token::Register(r1),
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);
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self.buf.extend([r0, r1]);
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Ok(())
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}
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LI | JMP => {
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expect_matches!(self, Token::Register(r0), Token::PSep);
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self.buf.push(r0);
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self.insert_imm()?;
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Ok(())
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}
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ADDI..=CMPUI | BMC | JEQ..=JGTU | ADDFI..=MULFI => {
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expect_matches!(
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self,
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Token::Register(r0),
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Token::PSep,
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Token::Register(r1),
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Token::PSep,
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);
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self.buf.extend([r0, r1]);
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self.insert_imm()?;
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Ok(())
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}
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LD..=ST => {
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expect_matches!(
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self,
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Token::Register(r0),
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Token::PSep,
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Token::Register(r1),
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Token::PSep,
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Token::Integer(offset),
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Token::PSep,
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Token::Integer(len),
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);
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self.buf.extend([r0, r1]);
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self.buf.extend(offset.to_le_bytes());
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self.buf.extend(
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u16::try_from(len)
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.map_err(|_| ErrorKind::InvalidToken)?
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.to_le_bytes(),
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);
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Ok(())
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}
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_ => unreachable!(),
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}?;
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match self.next() {
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Ok(Token::ISep) => (),
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Ok(_) => return Err(ErrorKind::UnexpectedToken),
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Err(ErrorKind::UnexpectedEnd) => return Ok(()),
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Err(e) => return Err(e),
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}
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}
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Some(Ok(Token::Label(lbl))) => {
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self.label_map.insert(lbl, self.buf.len() as u64);
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}
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Some(Ok(Token::ISep)) => (),
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Some(Ok(_)) => return Err(ErrorKind::UnexpectedToken),
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Some(Err(())) => return Err(ErrorKind::InvalidToken),
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None => return Ok(()),
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}
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}
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}
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fn link_local_syms(&mut self) -> Result<(), ErrorKind> {
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for (ix, sym) in &self.to_sub_label {
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self.label_map
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.get(sym)
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.ok_or(ErrorKind::InvalidSymbol)?
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.to_le_bytes()
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.iter()
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.enumerate()
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.for_each(|(i, b)| {
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self.buf[ix + i] = *b;
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});
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}
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Ok(())
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}
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fn insert_imm(&mut self) -> Result<(), ErrorKind> {
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let imm = match self.next()? {
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Token::Integer(i) => i.to_le_bytes(),
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Token::Symbol(s) => {
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self.to_sub_label.insert(self.buf.len(), s);
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[0; 8]
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}
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_ => return Err(ErrorKind::UnexpectedToken),
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};
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self.buf.extend(imm);
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Ok(())
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}
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}
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let mut asm = Assembler {
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lexer: Token::lexer(code),
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label_map: Default::default(),
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to_sub_label: Default::default(),
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buf,
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};
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asm.assemble().map_err(|kind| Error {
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kind,
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span: asm.lexer.span(),
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})?;
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asm.link_local_syms()
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.map_err(|kind| Error { kind, span: 0..0 })
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}
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