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making the functions kind of walk

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mlokr 2024-05-11 16:04:13 +02:00
parent 7435218999
commit 1d74f27b0e
7 changed files with 231 additions and 57 deletions
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14
hblang/examples/functions.hb Normal file
View file

@ -0,0 +1,14 @@
main := ||: int {
return add_one(10) + add_two(20);
}
add_two := |x: int|: int {
return x + 2;
}
add_one := |x: int|: int {
return x + 1;
}

155
hblang/src/codegen.rs
View file

@ -24,6 +24,7 @@ struct Frame {
struct Reloc {
id: LabelId,
offset: u32,
instr_offset: u16,
size: u16,
}
@ -43,26 +44,27 @@ impl Func {
self.code.extend_from_slice(bytes);
}
pub fn offset(&mut self, id: LabelId, offset: u32, size: u16) {
pub fn offset(&mut self, id: LabelId, instr_offset: u16, size: u16) {
self.relocs.push(Reloc {
id,
offset: self.code.len() as u32 + offset,
offset: self.code.len() as u32,
instr_offset,
size,
});
}
fn encode(&mut self, (len, instr): (usize, [u8; instrs::MAX_SIZE])) {
let name = instrs::NAMES[instr[0] as usize];
println!(
"{}: {}",
name,
instr
.iter()
.take(len)
.skip(1)
.map(|b| format!("{:02x}", b))
.collect::<String>()
);
// let name = instrs::NAMES[instr[0] as usize];
// println!(
// "{}: {}",
// name,
// instr
// .iter()
// .take(len)
// .skip(1)
// .map(|b| format!("{:02x}", b))
// .collect::<String>()
// );
self.code.extend_from_slice(&instr[..len]);
}
@ -95,7 +97,7 @@ impl Func {
self.encode(instrs::tx());
}
fn relocate(&mut self, labels: &[Label], shift: i64) {
fn relocate(&mut self, labels: &[FnLabel], shift: i64) {
for reloc in self.relocs.drain(..) {
let label = &labels[reloc.id as usize];
let offset = if reloc.size == 8 {
@ -104,7 +106,18 @@ impl Func {
label.offset as i64 - reloc.offset as i64
} + shift;
let dest = &mut self.code[reloc.offset as usize..][..reloc.size as usize];
dbg!(
label.name.as_ref(),
offset,
reloc.size,
reloc.instr_offset,
reloc.offset,
shift,
label.offset
);
let dest = &mut self.code[reloc.offset as usize + reloc.instr_offset as usize..]
[..reloc.size as usize];
match reloc.size {
2 => dest.copy_from_slice(&(offset as i16).to_le_bytes()),
4 => dest.copy_from_slice(&(offset as i32).to_le_bytes()),
@ -123,9 +136,9 @@ pub struct RegAlloc {
}
impl RegAlloc {
fn init_caller(&mut self) {
fn init_callee(&mut self) {
self.clear();
self.free.extend(1..=31);
self.free.extend(32..=253);
}
fn clear(&mut self) {
@ -146,7 +159,7 @@ impl RegAlloc {
}
}
struct Label {
struct FnLabel {
offset: u32,
// TODO: use different stile of identifier that does not allocate, eg. index + length into a
// file
@ -159,17 +172,23 @@ struct Variable<'a> {
ty: Expr<'a>,
}
struct RetReloc {
offset: u32,
instr_offset: u16,
size: u16,
}
pub struct Codegen<'a> {
path: &'a std::path::Path,
ret: Expr<'a>,
gpa: RegAlloc,
code: Func,
temp: Func,
labels: Vec<Label>,
labels: Vec<FnLabel>,
stack_size: u64,
vars: Vec<Variable<'a>>,
stack_relocs: Vec<StackReloc>,
ret_relocs: Vec<RetReloc>,
}
impl<'a> Codegen<'a> {
@ -185,6 +204,7 @@ impl<'a> Codegen<'a> {
vars: Default::default(),
stack_relocs: Default::default(),
ret_relocs: Default::default(),
}
}
@ -247,22 +267,59 @@ impl<'a> Codegen<'a> {
}
}
fn reloc_rets(&mut self) {
let len = self.code.code.len() as i32;
for reloc in self.ret_relocs.drain(..) {
let dest = &mut self.code.code[reloc.offset as usize + reloc.instr_offset as usize..]
[..reloc.size as usize];
debug_assert!(dest.iter().all(|&b| b == 0));
let offset = len - reloc.offset as i32;
dest.copy_from_slice(&offset.to_ne_bytes());
}
}
fn expr(&mut self, expr: &'a parser::Expr<'a>, expeted: Option<Expr<'a>>) -> Option<Value<'a>> {
use {lexer::TokenKind as T, parser::Expr as E};
match *expr {
E::Decl {
name,
val: E::Closure { ret, body },
val: E::Closure { ret, body, args },
} => {
let frame = self.add_label(name);
self.gpa.init_caller();
for (i, &(name, ty)) in args.iter().enumerate() {
let offset = self.alloc_stack(8);
self.decl_var(name, offset, ty);
self.store_stack(i as Reg + 2, offset, 8);
}
self.gpa.init_callee();
self.ret = **ret;
self.expr(body, None);
self.vars.clear();
let stack = std::mem::take(&mut self.stack_size);
self.reloc_stack(stack);
self.write_fn_prelude(frame);
self.reloc_rets();
self.ret();
None
}
E::Call {
func: E::Ident { name },
args,
} => {
for (i, arg) in args.iter().enumerate() {
let arg = self.expr(arg, None).unwrap();
let reg = self.loc_to_reg(arg.loc);
self.code.encode(instrs::cp(i as Reg + 2, reg));
}
let func = self.get_or_reserve_label(name);
self.code.call(func);
let reg = self.gpa.allocate();
self.code.encode(instrs::cp(reg, 1));
Some(Value {
ty: self.ret,
loc: Loc::Reg(reg),
})
}
E::Decl { name, val } => {
let val = self.expr(val, None).unwrap();
let reg = self.loc_to_reg(val.loc);
@ -292,7 +349,12 @@ impl<'a> Codegen<'a> {
val,
);
}
self.ret();
self.ret_relocs.push(RetReloc {
offset: self.code.code.len() as u32,
instr_offset: 1,
size: 4,
});
self.code.encode(instrs::jmp(0));
None
}
E::Block { stmts } => {
@ -348,7 +410,7 @@ impl<'a> Codegen<'a> {
if let Some(label) = self.labels.iter().position(|l| l.name.as_ref() == name) {
label as u32
} else {
self.labels.push(Label {
self.labels.push(FnLabel {
offset: 0,
name: name.into(),
});
@ -362,7 +424,7 @@ impl<'a> Codegen<'a> {
self.labels[label].offset = offset;
label as u32
} else {
self.labels.push(Label {
self.labels.push(FnLabel {
offset,
name: name.into(),
});
@ -394,6 +456,10 @@ impl<'a> Codegen<'a> {
reloc.offset += self.temp.code.len() as u32;
}
for reloc in &mut self.ret_relocs {
reloc.offset += self.temp.code.len() as u32;
}
self.code.code.splice(
frame.offset as usize..frame.offset as usize,
self.temp.code.drain(..),
@ -401,11 +467,8 @@ impl<'a> Codegen<'a> {
}
fn ret(&mut self) {
self.stack_relocs.push(StackReloc {
offset: self.code.code.len() as u32 + 3,
size: 8,
});
self.code.encode(instrs::addi64(STACK_PTR, STACK_PTR, 0));
self.code
.encode(instrs::addi64(STACK_PTR, STACK_PTR, self.stack_size as _));
for reg in self.gpa.used.clone().iter().rev() {
self.code.pop(*reg, 8);
}
@ -413,6 +476,8 @@ impl<'a> Codegen<'a> {
}
pub fn dump(mut self, out: &mut impl std::io::Write) -> std::io::Result<()> {
assert!(self.labels.iter().filter(|l| l.offset == 0).count() == 1);
self.temp.prelude(self.get_label("main"));
self.temp
.relocate(&self.labels, self.temp.code.len() as i64);
@ -444,6 +509,8 @@ pub enum Loc {
#[cfg(test)]
mod tests {
use crate::instrs;
struct TestMem;
impl hbvm::mem::Memory for TestMem {
@ -454,6 +521,17 @@ mod tests {
target: *mut u8,
count: usize,
) -> Result<(), hbvm::mem::LoadError> {
println!(
"read: {:x} {} {:?}",
addr.get(),
count,
core::slice::from_raw_parts(target, count)
.iter()
.rev()
.skip_while(|&&b| b == 0)
.map(|&b| format!("{:02x}", b))
.collect::<String>()
);
unsafe { core::ptr::copy(addr.get() as *const u8, target, count) }
Ok(())
}
@ -465,12 +543,26 @@ mod tests {
source: *const u8,
count: usize,
) -> Result<(), hbvm::mem::StoreError> {
println!("write: {:x} {}", addr.get(), count);
unsafe { core::ptr::copy(source, addr.get() as *mut u8, count) }
Ok(())
}
#[inline]
unsafe fn prog_read<T: Copy>(&mut self, addr: hbvm::mem::Address) -> T {
println!(
"read-typed: {:x} {} {:?}",
addr.get(),
std::any::type_name::<T>(),
if core::mem::size_of::<T>() == 1 {
instrs::NAMES[std::ptr::read(addr.get() as *const u8) as usize].to_string()
} else {
core::slice::from_raw_parts(addr.get() as *const u8, core::mem::size_of::<T>())
.iter()
.map(|&b| format!("{:02x}", b))
.collect::<String>()
}
);
unsafe { core::ptr::read(addr.get() as *const T) }
}
}
@ -507,7 +599,7 @@ mod tests {
}
};
writeln!(output, "ret: {:?}", vm.read_reg(1)).unwrap();
writeln!(output, "ret: {:?}", vm.read_reg(1).0).unwrap();
writeln!(output, "status: {:?}", stat).unwrap();
}
@ -515,5 +607,6 @@ mod tests {
example => include_str!("../examples/main_fn.hb");
arithmetic => include_str!("../examples/arithmetic.hb");
variables => include_str!("../examples/variables.hb");
functions => include_str!("../examples/functions.hb");
}
}

9
hblang/src/lexer.rs
View file

@ -1,4 +1,4 @@
#[derive(Debug, PartialEq)]
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub struct Token {
pub kind: TokenKind,
pub start: u32,
@ -27,9 +27,11 @@ pub enum TokenKind {
Minus,
Star,
FSlash,
Bor,
Or,
Semi,
Colon,
Comma,
Return,
Eof,
Error,
@ -53,9 +55,11 @@ impl std::fmt::Display for TokenKind {
T::Minus => "-",
T::Star => "*",
T::FSlash => "/",
T::Bor => "|",
T::Or => "||",
T::Semi => ";",
T::Colon => ":",
T::Comma => ",",
T::Return => "return",
T::Eof => "<eof>",
T::Error => "<error>",
@ -164,6 +168,7 @@ impl<'a> Iterator for Lexer<'a> {
true => T::Decl,
false => T::Colon,
},
b',' => T::Comma,
b';' => T::Semi,
b'=' => T::Assign,
b'+' => T::Plus,
@ -172,7 +177,7 @@ impl<'a> Iterator for Lexer<'a> {
b'/' => T::FSlash,
b'|' => match self.advance_if(b'|') {
true => T::Or,
false => T::Error,
false => T::Bor,
},
b'(' => T::LParen,
b')' => T::RParen,

88
hblang/src/parser.rs
View file

@ -1,4 +1,4 @@
use std::{cell::Cell, ptr::NonNull};
use std::{cell::Cell, ops::Not, ptr::NonNull};
use crate::lexer::{Lexer, Token, TokenKind};
@ -74,7 +74,7 @@ impl<'a, 'b> Parser<'a, 'b> {
fn unit_expr(&mut self) -> Expr<'a> {
let token = self.next();
let expr = match token.kind {
let mut expr = match token.kind {
TokenKind::Ident => {
let name = self.arena.alloc_str(self.lexer.slice(token));
if self.advance_if(TokenKind::Decl) {
@ -91,7 +91,27 @@ impl<'a, 'b> Parser<'a, 'b> {
self.expect_advance(TokenKind::Colon);
let ret = self.ptr_expr();
let body = self.ptr_expr();
Expr::Closure { ret, body }
Expr::Closure {
ret,
body,
args: &[],
}
}
TokenKind::Bor => {
let args = self.collect(|s| {
s.advance_if(TokenKind::Bor).not().then(|| {
let name = s.expect_advance(TokenKind::Ident);
let name = s.arena.alloc_str(s.lexer.slice(name));
s.expect_advance(TokenKind::Colon);
let val = s.expr();
s.advance_if(TokenKind::Comma);
(name, val)
})
});
self.expect_advance(TokenKind::Colon);
let ret = self.ptr_expr();
let body = self.ptr_expr();
Expr::Closure { args, ret, body }
}
TokenKind::LBrace => Expr::Block {
stmts: self.collect(|s| (!s.advance_if(TokenKind::RBrace)).then(|| s.expr())),
@ -110,19 +130,33 @@ impl<'a, 'b> Parser<'a, 'b> {
tok => self.report(format_args!("unexpected token: {tok:?}")),
};
loop {
expr = match self.token.kind {
TokenKind::LParen => {
self.next();
Expr::Call {
func: self.arena.alloc(expr),
args: self.collect(|s| {
s.advance_if(TokenKind::RParen).not().then(|| {
let arg = s.expr();
s.advance_if(TokenKind::Comma);
arg
})
}),
}
}
_ => break,
}
}
self.advance_if(TokenKind::Semi);
expr
}
fn collect(&mut self, mut f: impl FnMut(&mut Self) -> Option<Expr<'a>>) -> Slice<'a, Expr<'a>> {
let prev_len = self.expr_buf.len();
while let Some(v) = f(self) {
self.expr_buf.push(v);
}
let sl = self.arena.alloc_slice(&self.expr_buf[prev_len..]);
self.expr_buf.truncate(prev_len);
sl
fn collect<T: Copy>(&mut self, mut f: impl FnMut(&mut Self) -> Option<T>) -> Slice<'a, T> {
let vec = std::iter::from_fn(|| f(self)).collect::<Vec<_>>();
self.arena.alloc_slice(&vec)
}
fn advance_if(&mut self, kind: TokenKind) -> bool {
@ -134,14 +168,14 @@ impl<'a, 'b> Parser<'a, 'b> {
}
}
fn expect_advance(&mut self, kind: TokenKind) {
fn expect_advance(&mut self, kind: TokenKind) -> Token {
if self.token.kind != kind {
self.report(format_args!(
"expected {:?}, found {:?}",
kind, self.token.kind
));
}
self.next();
self.next()
}
fn report(&self, msg: impl std::fmt::Display) -> ! {
@ -158,9 +192,14 @@ pub enum Expr<'a> {
val: Ptr<'a, Expr<'a>>,
},
Closure {
args: Slice<'a, (Ptr<'a, str>, Expr<'a>)>,
ret: Ptr<'a, Expr<'a>>,
body: Ptr<'a, Expr<'a>>,
},
Call {
func: Ptr<'a, Expr<'a>>,
args: Slice<'a, Expr<'a>>,
},
Return {
val: Option<Ptr<'a, Expr<'a>>>,
},
@ -188,7 +227,28 @@ impl<'a> std::fmt::Display for Expr<'a> {
match *self {
Self::Decl { name, val } => write!(f, "{} := {}", name, val),
Self::Closure { ret, body } => write!(f, "||: {} {}", ret, body),
Self::Closure { ret, body, args } => {
write!(f, "|")?;
let first = &mut true;
for (name, val) in args {
if !std::mem::take(first) {
write!(f, ", ")?;
}
write!(f, "{}: {}", name, val)?;
}
write!(f, "|: {} {}", ret, body)
}
Self::Call { func, args } => {
write!(f, "{}(", func)?;
let first = &mut true;
for arg in args {
if !std::mem::take(first) {
write!(f, ", ")?;
}
write!(f, "{}", arg)?;
}
write!(f, ")")
}
Self::Return { val: Some(val) } => write!(f, "return {};", val),
Self::Return { val: None } => write!(f, "return;"),
Self::Ident { name } => write!(f, "{}", name),

0
hblang/tests/hblang::codegen::tests::functions.txt Normal file
View file

2
hblang/tests/hblang::codegen::tests::variables.txt
View file

@ -0,0 +1,2 @@
ret: 0
status: Ok(())

2
hbvm/src/vmrun.rs
View file

@ -243,7 +243,7 @@ where
}),
JMP => {
let OpsO(off) = self.decode();
self.pc = self.pc.wrapping_add(off).wrapping_add(1);
self.pc = self.pc.wrapping_add(off);
}
JAL => {
// Jump and link. Save PC after this instruction to