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holey-bytes/hblang/src/codegen.rs
mlokr e00f2f08c8
removing garbage
2024-07-08 07:22:53 +02:00

2952 lines
98 KiB
Rust
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use {
self::reg::{RET_ADDR, STACK_PTR, ZERO},
crate::{
ident::{self, Ident},
instrs::{self, *},
lexer::TokenKind,
log,
parser::{self, find_symbol, idfl, CtorField, Expr, ExprRef, FileId, Pos},
HashMap,
},
std::{ops::Range, rc::Rc},
};
type Offset = u32;
type Size = u32;
mod stack {
use {
super::{Offset, Size},
std::num::NonZeroU32,
};
#[derive(Debug, PartialEq, Eq)]
pub struct Id(NonZeroU32);
impl Id {
fn index(&self) -> usize {
(self.0.get() as usize - 1) & !(1 << 31)
}
pub fn repr(&self) -> u32 {
self.0.get()
}
pub fn as_ref(&self) -> Self {
Self(unsafe { NonZeroU32::new_unchecked(self.0.get() | 1 << 31) })
}
pub fn is_ref(&self) -> bool {
self.0.get() & (1 << 31) != 0
}
}
impl Drop for Id {
fn drop(&mut self) {
if !std::thread::panicking() && !self.is_ref() {
unreachable!("stack id leaked: {:?}", self.0);
}
}
}
#[derive(PartialEq)]
struct Meta {
size: Size,
offset: Offset,
rc: u32,
}
#[derive(Default)]
pub struct Alloc {
height: Size,
pub max_height: Size,
meta: Vec<Meta>,
}
impl Alloc {
pub fn allocate(&mut self, size: Size) -> Id {
self.meta.push(Meta { size, offset: 0, rc: 1 });
self.height += size;
self.max_height = self.max_height.max(self.height);
Id(unsafe { NonZeroU32::new_unchecked(self.meta.len() as u32) })
}
pub fn free(&mut self, id: Id) {
if id.is_ref() {
return;
}
let meta = &mut self.meta[id.index()];
std::mem::forget(id);
meta.rc -= 1;
if meta.rc != 0 {
return;
}
meta.offset = self.height;
self.height -= meta.size;
}
pub fn dup_id(&mut self, id: &Id) -> Id {
if id.is_ref() {
return id.as_ref();
}
self.meta[id.index()].rc += 1;
Id(id.0)
}
pub fn finalize_leaked(&mut self) {
for meta in self.meta.iter_mut().filter(|m| m.rc > 0) {
meta.offset = self.height;
self.height -= meta.size;
}
}
pub fn clear(&mut self) {
self.height = 0;
self.max_height = 0;
self.meta.clear();
}
pub fn final_offset(&self, id: u32, extra_offset: Offset) -> Offset {
debug_assert_ne!(id, 0);
(self.max_height - self.meta[(id as usize - 1) & !(1 << 31)].offset) + extra_offset
}
}
}
mod reg {
pub const STACK_PTR: Reg = 254;
pub const ZERO: Reg = 0;
pub const RET: Reg = 1;
pub const RET_ADDR: Reg = 31;
type Reg = u8;
#[derive(Default, Debug, PartialEq, Eq)]
pub struct Id(Reg, bool);
impl Id {
pub const RET: Self = Id(RET, false);
pub fn get(&self) -> Reg {
self.0
}
pub fn as_ref(&self) -> Self {
Self(self.0, false)
}
pub fn is_ref(&self) -> bool {
!self.1
}
}
impl From<u8> for Id {
fn from(value: u8) -> Self {
Self(value, false)
}
}
impl Drop for Id {
fn drop(&mut self) {
if !std::thread::panicking() && self.1 {
unreachable!("reg id leaked: {:?}", self.0);
}
}
}
#[derive(Default, PartialEq, Eq)]
pub struct Alloc {
free: Vec<Reg>,
max_used: Reg,
}
impl Alloc {
pub fn init(&mut self) {
self.free.clear();
self.free.extend((32..=253).rev());
self.max_used = RET_ADDR;
}
pub fn allocate(&mut self) -> Id {
let reg = self.free.pop().expect("TODO: we need to spill");
self.max_used = self.max_used.max(reg);
Id(reg, true)
}
pub fn free(&mut self, reg: Id) {
if reg.1 {
self.free.push(reg.0);
std::mem::forget(reg);
}
}
pub fn pushed_size(&self) -> usize {
((self.max_used as usize).saturating_sub(RET_ADDR as usize) + 1) * 8
}
}
}
pub mod ty {
use {
crate::{
lexer::TokenKind,
parser::{self, Expr},
},
std::{num::NonZeroU32, ops::Range},
};
pub type Builtin = u32;
pub type Struct = u32;
pub type Ptr = u32;
pub type Func = u32;
pub type Global = u32;
pub type Module = u32;
pub type Param = u32;
#[derive(Clone, Copy)]
pub struct Tuple(pub u32);
impl Tuple {
const LEN_BITS: u32 = 5;
const LEN_MASK: usize = Self::MAX_LEN - 1;
const MAX_LEN: usize = 1 << Self::LEN_BITS;
pub fn new(pos: usize, len: usize) -> Option<Self> {
if len >= Self::MAX_LEN {
return None;
}
Some(Self((pos << Self::LEN_BITS | len) as u32))
}
pub fn view(self, slice: &[Id]) -> &[Id] {
&slice[self.0 as usize >> Self::LEN_BITS..][..self.len()]
}
pub fn range(self) -> Range<usize> {
let start = self.0 as usize >> Self::LEN_BITS;
start..start + self.len()
}
pub fn len(self) -> usize {
self.0 as usize & Self::LEN_MASK
}
pub fn is_empty(self) -> bool {
self.0 == 0
}
pub fn empty() -> Self {
Self(0)
}
pub fn repr(&self) -> u32 {
self.0
}
}
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
pub struct Id(NonZeroU32);
impl Default for Id {
fn default() -> Self {
Self(unsafe { NonZeroU32::new_unchecked(UNDECLARED) })
}
}
impl Id {
pub const fn from_bt(bt: u32) -> Self {
Self(unsafe { NonZeroU32::new_unchecked(bt) })
}
pub fn is_signed(self) -> bool {
(I8..=INT).contains(&self.repr())
}
pub fn is_unsigned(self) -> bool {
(U8..=UINT).contains(&self.repr())
}
pub fn is_integer(self) -> bool {
(U8..=INT).contains(&self.repr())
}
pub fn strip_pointer(self) -> Self {
match self.expand() {
Kind::Ptr(_) => Kind::Builtin(UINT).compress(),
_ => self,
}
}
pub fn is_pointer(self) -> bool {
matches!(Kind::from_ty(self), Kind::Ptr(_))
}
pub fn try_upcast(self, ob: Self) -> Option<Self> {
let (oa, ob) = (Self(self.0.min(ob.0)), Self(self.0.max(ob.0)));
let (a, b) = (oa.strip_pointer(), ob.strip_pointer());
Some(match () {
_ if oa == ob => oa,
_ if a.is_signed() && b.is_signed() || a.is_unsigned() && b.is_unsigned() => ob,
_ if a.is_unsigned() && b.is_signed() && a.repr() - U8 < b.repr() - I8 => ob,
_ if oa.is_integer() && ob.is_pointer() => ob,
_ => return None,
})
}
pub fn expand(self) -> Kind {
Kind::from_ty(self)
}
pub const fn repr(self) -> u32 {
self.0.get()
}
}
impl From<[u8; 8]> for Id {
fn from(id: [u8; 8]) -> Self {
Self(unsafe { NonZeroU32::new_unchecked(u64::from_ne_bytes(id) as _) })
}
}
impl From<u32> for Id {
fn from(id: u32) -> Self {
Kind::Builtin(id).compress()
}
}
const fn array_to_lower_case<const N: usize>(array: [u8; N]) -> [u8; N] {
let mut result = [0; N];
let mut i = 0;
while i < N {
result[i] = array[i].to_ascii_lowercase();
i += 1;
}
result
}
// const string to lower case
macro_rules! builtin_type {
($($name:ident;)*) => {
$(pub const $name: Builtin = ${index(0)} + 1;)*
mod __lc_names {
use super::*;
$(pub const $name: &[u8] = &array_to_lower_case(unsafe {
*(stringify!($name).as_ptr() as *const [u8; stringify!($name).len()]) });)*
}
pub fn from_str(name: &str) -> Option<Builtin> {
match name.as_bytes() {
$(__lc_names::$name => Some($name),)*
_ => None,
}
}
pub fn to_str(ty: Builtin) -> &'static str {
match ty {
$($name => unsafe { std::str::from_utf8_unchecked(__lc_names::$name) },)*
v => unreachable!("invalid type: {}", v),
}
}
};
}
builtin_type! {
UNDECLARED;
NEVER;
VOID;
TYPE;
BOOL;
U8;
U16;
U32;
UINT;
I8;
I16;
I32;
INT;
}
macro_rules! type_kind {
($(#[$meta:meta])* $vis:vis enum $name:ident {$( $variant:ident, )*}) => {
$(#[$meta])*
$vis enum $name {
$($variant($variant),)*
}
impl $name {
const FLAG_BITS: u32 = (${count($variant)} as u32).next_power_of_two().ilog2();
const FLAG_OFFSET: u32 = std::mem::size_of::<Id>() as u32 * 8 - Self::FLAG_BITS;
const INDEX_MASK: u32 = (1 << (32 - Self::FLAG_BITS)) - 1;
$vis fn from_ty(ty: Id) -> Self {
let (flag, index) = (ty.repr() >> Self::FLAG_OFFSET, ty.repr() & Self::INDEX_MASK);
match flag {
$(${index(0)} => Self::$variant(index),)*
i => unreachable!("{i}"),
}
}
$vis const fn compress(self) -> Id {
let (index, flag) = match self {
$(Self::$variant(index) => (index, ${index(0)}),)*
};
Id(unsafe { NonZeroU32::new_unchecked((flag << Self::FLAG_OFFSET) | index) })
}
$vis const fn inner(self) -> u32 {
match self {
$(Self::$variant(index) => index,)*
}
}
}
};
}
type_kind! {
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Kind {
Builtin,
Struct,
Ptr,
Func,
Global,
Module,
}
}
impl Default for Kind {
fn default() -> Self {
Self::Builtin(UNDECLARED)
}
}
pub struct Display<'a> {
tys: &'a super::Types,
files: &'a [parser::Ast],
ty: Id,
}
impl<'a> Display<'a> {
pub(super) fn new(tys: &'a super::Types, files: &'a [parser::Ast], ty: Id) -> Self {
Self { tys, files, ty }
}
fn rety(&self, ty: Id) -> Self {
Self::new(self.tys, self.files, ty)
}
}
impl<'a> std::fmt::Display for Display<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use Kind as TK;
match TK::from_ty(self.ty) {
TK::Module(idx) => write!(f, "module{}", idx),
TK::Builtin(ty) => write!(f, "{}", to_str(ty)),
TK::Ptr(ty) => {
write!(f, "^{}", self.rety(self.tys.ptrs[ty as usize].base))
}
_ if let Some((key, _)) = self
.tys
.syms
.iter()
.find(|(sym, &ty)| sym.file != u32::MAX && ty == self.ty)
&& let Some(name) = self.files[key.file as usize].exprs().iter().find_map(
|expr| match expr {
Expr::BinOp {
left: &Expr::Ident { name, id, .. },
op: TokenKind::Decl,
..
} if id == key.ident => Some(name),
_ => None,
},
) =>
{
write!(f, "{name}")
}
TK::Struct(idx) => {
let record = &self.tys.structs[idx as usize];
write!(f, "{{")?;
for (i, &super::Field { ref name, ty }) in record.fields.iter().enumerate() {
if i != 0 {
write!(f, ", ")?;
}
write!(f, "{name}: {}", self.rety(ty))?;
}
write!(f, "}}")
}
TK::Func(idx) => write!(f, "fn{idx}"),
TK::Global(idx) => write!(f, "global{idx}"),
}
}
}
}
#[derive(Clone, Copy, Debug)]
struct Reloc {
offset: Offset,
sub_offset: u8,
width: u8,
#[cfg(debug_assertions)]
shifted: bool,
}
impl Reloc {
fn new(offset: u32, sub_offset: u8, width: u8) -> Self {
Self {
offset,
sub_offset,
width,
#[cfg(debug_assertions)]
shifted: false,
}
}
fn shifted(offset: u32, sub_offset: u8, width: u8) -> Self {
Self {
offset,
sub_offset,
width,
#[cfg(debug_assertions)]
shifted: true,
}
}
fn apply_stack_offset(&self, code: &mut [u8], stack: &stack::Alloc) {
let bytes = &code[self.offset as usize + self.sub_offset as usize..][..self.width as usize];
let (id, off) = Self::unpack_srel(u64::from_ne_bytes(bytes.try_into().unwrap()));
self.write_offset(code, stack.final_offset(id, off) as i64);
}
fn pack_srel(id: &stack::Id, off: u32) -> u64 {
((id.repr() as u64) << 32) | (off as u64)
}
fn unpack_srel(id: u64) -> (u32, u32) {
((id >> 32) as u32, id as u32)
}
fn apply_jump(&self, code: &mut [u8], to: u32) {
let offset = to as i64 - self.offset as i64;
self.write_offset(code, offset);
}
fn write_offset(&self, code: &mut [u8], offset: i64) {
#[cfg(debug_assertions)]
assert!(self.shifted);
let bytes = offset.to_ne_bytes();
let slice = &mut code[self.offset as usize + self.sub_offset as usize..];
slice[..self.width as usize].copy_from_slice(&bytes[..self.width as usize]);
}
}
struct Value {
ty: ty::Id,
loc: Loc,
}
impl Value {
fn new(ty: impl Into<ty::Id>, loc: impl Into<Loc>) -> Self {
Self { ty: ty.into(), loc: loc.into() }
}
fn void() -> Self {
Self { ty: ty::VOID.into(), loc: Loc::imm(0) }
}
fn imm(value: u64) -> Self {
Self { ty: ty::UINT.into(), loc: Loc::imm(value) }
}
fn ty(ty: ty::Id) -> Self {
Self { ty: ty::TYPE.into(), loc: Loc::ct((ty.repr() as u64).to_ne_bytes()) }
}
}
enum LocCow<'a> {
Ref(&'a Loc),
Owned(Loc),
}
impl<'a> LocCow<'a> {
fn as_ref(&self) -> &Loc {
match self {
Self::Ref(value) => value,
Self::Owned(value) => value,
}
}
}
impl<'a> From<&'a Loc> for LocCow<'a> {
fn from(value: &'a Loc) -> Self {
Self::Ref(value)
}
}
impl<'a> From<Loc> for LocCow<'a> {
fn from(value: Loc) -> Self {
Self::Owned(value)
}
}
#[derive(Debug, PartialEq, Eq)]
pub enum Loc {
Rt { derefed: bool, reg: reg::Id, stack: Option<stack::Id>, offset: Offset },
Ct { value: [u8; 8] },
}
impl Loc {
fn stack(stack: stack::Id) -> Self {
Self::Rt { stack: Some(stack), reg: reg::STACK_PTR.into(), derefed: true, offset: 0 }
}
fn reg(reg: impl Into<reg::Id>) -> Self {
let reg = reg.into();
assert!(reg.get() != 0);
Self::Rt { derefed: false, reg, stack: None, offset: 0 }
}
fn imm(value: u64) -> Self {
Self::ct(value.to_ne_bytes())
}
fn ct(value: [u8; 8]) -> Self {
Self::Ct { value }
}
fn ty(ty: ty::Id) -> Self {
Self::imm(ty.repr() as _)
}
fn offset(mut self, offset: u32) -> Self {
match &mut self {
Self::Rt { offset: off, .. } => *off += offset,
_ => unreachable!("offseting constant"),
}
self
}
fn as_ref(&self) -> Self {
match *self {
Loc::Rt { derefed, ref reg, ref stack, offset } => Loc::Rt {
derefed,
reg: reg.as_ref(),
stack: stack.as_ref().map(stack::Id::as_ref),
offset,
},
Loc::Ct { value } => Self::Ct { value },
}
}
fn into_derefed(mut self) -> Self {
match &mut self {
Self::Rt { derefed, .. } => *derefed = true,
val => unreachable!("{val:?}"),
}
self
}
fn assert_valid(&self) {
assert!(!matches!(self, Self::Rt { reg, .. } if reg.get() == 0));
}
fn take_owned(&mut self) -> Option<Self> {
if self.is_ref() {
return None;
}
Some(std::mem::replace(self, self.as_ref()))
}
fn is_ref(&self) -> bool {
matches!(self, Self::Rt { reg, stack, .. } if reg.is_ref() && stack.as_ref().map_or(true, stack::Id::is_ref))
}
fn to_ty(&self) -> Option<ty::Id> {
match *self {
Self::Ct { value } => Some(ty::Id::from(value)),
Self::Rt { .. } => None,
}
}
}
impl From<reg::Id> for Loc {
fn from(reg: reg::Id) -> Self {
Loc::reg(reg)
}
}
impl Default for Loc {
fn default() -> Self {
Self::Ct { value: [0; 8] }
}
}
struct Loop {
var_count: u32,
offset: u32,
reloc_base: u32,
}
struct Variable {
id: Ident,
value: Value,
}
#[derive(Default)]
struct ItemCtx {
file: FileId,
id: ty::Kind,
ret: ty::Id,
ret_reg: reg::Id,
task_base: usize,
snap: Snapshot,
stack: stack::Alloc,
regs: reg::Alloc,
stack_relocs: Vec<Reloc>,
ret_relocs: Vec<Reloc>,
loop_relocs: Vec<Reloc>,
loops: Vec<Loop>,
vars: Vec<Variable>,
}
impl ItemCtx {
pub fn dup_loc(&mut self, loc: &Loc) -> Loc {
match *loc {
Loc::Rt { derefed, ref reg, ref stack, offset } => Loc::Rt {
reg: reg.as_ref(),
derefed,
stack: stack.as_ref().map(|s| self.stack.dup_id(s)),
offset,
},
Loc::Ct { value } => Loc::Ct { value },
}
}
fn finalize(&mut self, output: &mut Output) {
let len = output.code.len() as Offset;
let base = self.snap.code as Offset;
for reloc in output.reloc_iter_mut(&self.snap).chain(&mut self.ret_relocs) {
#[cfg(debug_assertions)]
{
if std::mem::replace(&mut reloc.shifted, true) {
panic!("reloc visited twice");
}
}
reloc.offset += base;
debug_assert!(reloc.offset < len);
}
self.stack.finalize_leaked();
for rel in self.stack_relocs.drain(..) {
rel.apply_stack_offset(&mut output.code[base as usize..], &self.stack)
}
for rel in self.ret_relocs.drain(..) {
rel.apply_jump(&mut output.code, len);
}
self.finalize_frame(output);
self.stack.clear();
debug_assert!(self.loops.is_empty());
debug_assert!(self.loop_relocs.is_empty());
debug_assert!(self.vars.is_empty());
}
fn finalize_frame(&mut self, output: &mut Output) {
let mut cursor = self.snap.code;
let mut allocate = |size| (cursor += size, cursor).1;
let pushed = self.regs.pushed_size() as i64;
let stack = self.stack.max_height as i64;
let mut exmpl = Output::default();
exmpl.emit_prelude();
debug_assert_eq!(exmpl.code.as_slice(), &output.code[self.snap.code..][..exmpl.code.len()],);
write_reloc(&mut output.code, allocate(3), -(pushed + stack), 8);
write_reloc(&mut output.code, allocate(8 + 3), stack, 8);
write_reloc(&mut output.code, allocate(8), pushed, 2);
output.emit(ld(RET_ADDR, STACK_PTR, stack as _, pushed as _));
output.emit(addi64(STACK_PTR, STACK_PTR, (pushed + stack) as _));
}
fn free_loc(&mut self, src: impl Into<LocCow>) {
if let LocCow::Owned(Loc::Rt { reg, stack, .. }) = src.into() {
self.regs.free(reg);
if let Some(stack) = stack {
self.stack.free(stack);
}
}
}
}
fn write_reloc(doce: &mut [u8], offset: usize, value: i64, size: u16) {
let value = value.to_ne_bytes();
doce[offset..offset + size as usize].copy_from_slice(&value[..size as usize]);
}
#[derive(PartialEq, Eq, Hash)]
struct SymKey {
file: u32,
ident: u32,
}
impl SymKey {
pub fn pointer_to(ty: ty::Id) -> Self {
Self { file: u32::MAX, ident: ty.repr() }
}
}
#[derive(Clone, Copy)]
struct Sig {
args: ty::Tuple,
ret: ty::Id,
}
#[derive(Clone, Copy)]
struct Func {
file: FileId,
expr: ExprRef,
sig: Option<Sig>,
offset: Offset,
}
struct Global {
offset: Offset,
ty: ty::Id,
}
struct Field {
name: Rc<str>,
ty: ty::Id,
}
struct Struct {
fields: Rc<[Field]>,
}
struct Ptr {
base: ty::Id,
}
struct ParamAlloc(Range<u8>);
impl ParamAlloc {
pub fn next(&mut self) -> u8 {
self.0.next().expect("too many paramteters")
}
fn next_wide(&mut self) -> u8 {
(self.next(), self.next()).0
}
}
#[derive(Default)]
struct Types {
syms: HashMap<SymKey, ty::Id>,
funcs: Vec<Func>,
args: Vec<ty::Id>,
globals: Vec<Global>,
structs: Vec<Struct>,
ptrs: Vec<Ptr>,
}
impl Types {
fn parama(&self, ret: impl Into<ty::Id>) -> ParamAlloc {
ParamAlloc(2 + (9..=16).contains(&self.size_of(ret.into())) as u8..12)
}
fn offset_of(&self, idx: ty::Struct, field: &str) -> Option<(Offset, ty::Id)> {
let record = &self.structs[idx as usize];
let until = record.fields.iter().position(|f| f.name.as_ref() == field)?;
let mut offset = 0;
for &Field { ty, .. } in &record.fields[..until] {
offset = Self::align_up(offset, self.align_of(ty));
offset += self.size_of(ty);
}
Some((offset, record.fields[until].ty))
}
fn make_ptr(&mut self, base: ty::Id) -> ty::Id {
ty::Kind::Ptr(self.make_ptr_low(base)).compress()
}
fn make_ptr_low(&mut self, base: ty::Id) -> ty::Ptr {
let id = SymKey::pointer_to(base);
self.syms
.entry(id)
.or_insert_with(|| {
self.ptrs.push(Ptr { base });
ty::Kind::Ptr(self.ptrs.len() as u32 - 1).compress()
})
.expand()
.inner()
}
fn align_up(value: Size, align: Size) -> Size {
(value + align - 1) & !(align - 1)
}
fn size_of(&self, ty: ty::Id) -> Size {
match ty.expand() {
ty::Kind::Ptr(_) => 8,
ty::Kind::Builtin(ty::VOID) => 0,
ty::Kind::Builtin(ty::NEVER) => unreachable!(),
ty::Kind::Builtin(ty::INT | ty::UINT) => 8,
ty::Kind::Builtin(ty::I32 | ty::U32 | ty::TYPE) => 4,
ty::Kind::Builtin(ty::I16 | ty::U16) => 2,
ty::Kind::Builtin(ty::I8 | ty::U8 | ty::BOOL) => 1,
ty::Kind::Struct(ty) => {
let mut offset = 0u32;
let record = &self.structs[ty as usize];
for &Field { ty, .. } in record.fields.iter() {
let align = self.align_of(ty);
offset = Self::align_up(offset, align);
offset += self.size_of(ty);
}
offset
}
ty => unimplemented!("size_of: {:?}", ty),
}
}
fn align_of(&self, ty: ty::Id) -> Size {
match ty.expand() {
ty::Kind::Struct(t) => self.structs[t as usize]
.fields
.iter()
.map(|&Field { ty, .. }| self.align_of(ty))
.max()
.unwrap(),
_ => self.size_of(ty).max(1),
}
}
}
mod task {
use super::Offset;
pub fn unpack(offset: Offset) -> Result<Offset, usize> {
if offset >> 31 != 0 {
Err((offset & !(1 << 31)) as usize)
} else {
Ok(offset)
}
}
pub fn id(index: usize) -> Offset {
1 << 31 | index as u32
}
}
struct FTask {
file: FileId,
id: ty::Func,
}
#[derive(Default, Clone, Copy, PartialEq, Eq, Debug)]
pub struct Snapshot {
code: usize,
string_data: usize,
funcs: usize,
globals: usize,
strings: usize,
}
#[derive(Default)]
struct Output {
code: Vec<u8>,
string_data: Vec<u8>,
funcs: Vec<(ty::Func, Reloc)>,
globals: Vec<(ty::Global, Reloc)>,
strings: Vec<StringReloc>,
}
impl Output {
fn emit_addi(&mut self, dest: u8, op: u8, delta: u64) {
if delta == 0 {
if dest != op {
self.emit(cp(dest, op));
}
return;
}
self.emit(addi64(dest, op, delta));
}
fn emit(&mut self, (len, instr): (usize, [u8; instrs::MAX_SIZE])) {
let name = instrs::NAMES[instr[0] as usize];
log::dbg!(
"{:08x}: {}: {}",
self.code.len(),
name,
instr.iter().take(len).skip(1).map(|b| format!("{:02x}", b)).collect::<String>()
);
self.code.extend_from_slice(&instr[..len]);
}
fn emit_prelude(&mut self) {
self.emit(instrs::addi64(STACK_PTR, STACK_PTR, 0));
self.emit(instrs::st(RET_ADDR, STACK_PTR, 0, 0));
}
fn emit_entry_prelude(&mut self) {
self.emit(jal(RET_ADDR, reg::ZERO, 0));
self.emit(tx());
}
fn reloc_iter_mut(&mut self, snap: &Snapshot) -> impl Iterator<Item = &mut Reloc> {
self.globals[snap.globals..]
.iter_mut()
.chain(&mut self.funcs[snap.funcs..])
.map(|(_, rel)| rel)
.chain(self.strings[snap.strings..].iter_mut().map(|rl| &mut rl.reloc))
}
fn append(&mut self, val: &mut Self) {
val.pop(self, &Snapshot::default());
}
fn pop(&mut self, stash: &mut Self, snap: &Snapshot) {
let init_code = stash.code.len();
stash.code.extend(self.code.drain(snap.code..));
stash.string_data.extend(self.string_data.drain(snap.string_data..));
stash.funcs.extend(self.funcs.drain(snap.funcs..).inspect(|(_, rel)| {
#[cfg(debug_assertions)]
assert!(!rel.shifted);
debug_assert!(
rel.offset as usize + init_code < stash.code.len(),
"{} {} {}",
rel.offset,
init_code,
stash.code.len()
)
}));
stash.globals.extend(self.globals.drain(snap.globals..).inspect(|(_, rel)| {
log::dbg!(
"reloc: {rel:?} {init_code} {} {} {}",
stash.code.len(),
self.code.len(),
snap.code
);
debug_assert!(rel.offset as usize + init_code < stash.code.len())
}));
stash.strings.extend(self.strings.drain(snap.strings..).inspect(|str| {
debug_assert!(str.reloc.offset as usize + init_code < stash.code.len())
}));
}
fn trunc(&mut self, snap: &Snapshot) {
self.code.truncate(snap.code);
self.string_data.truncate(snap.string_data);
self.globals.truncate(snap.globals);
self.funcs.truncate(snap.funcs);
self.strings.truncate(snap.strings);
}
fn write_trap(&mut self, trap: Trap) {
let len = self.code.len();
self.code.resize(len + std::mem::size_of::<Trap>(), 0);
unsafe { std::ptr::write_unaligned(self.code.as_mut_ptr().add(len) as _, trap) }
}
fn snap(&mut self) -> Snapshot {
Snapshot {
code: self.code.len(),
string_data: self.string_data.len(),
funcs: self.funcs.len(),
globals: self.globals.len(),
strings: self.strings.len(),
}
}
}
#[derive(Default, Debug)]
struct Ctx {
loc: Option<Loc>,
ty: Option<ty::Id>,
}
impl Ctx {
pub fn with_loc(self, loc: Loc) -> Self {
Self { loc: Some(loc), ..self }
}
pub fn with_ty(self, ty: impl Into<ty::Id>) -> Self {
Self { ty: Some(ty.into()), ..self }
}
fn into_value(self) -> Option<Value> {
Some(Value { ty: self.ty.unwrap(), loc: self.loc? })
}
}
impl From<Value> for Ctx {
fn from(value: Value) -> Self {
Self { loc: Some(value.loc), ty: Some(value.ty) }
}
}
#[derive(Default)]
struct Pool {
cis: Vec<ItemCtx>,
outputs: Vec<Output>,
arg_locs: Vec<Loc>,
}
#[derive(Default)]
pub struct LoggedMem {
pub mem: hbvm::mem::HostMemory,
}
impl hbvm::mem::Memory for LoggedMem {
unsafe fn load(
&mut self,
addr: hbvm::mem::Address,
target: *mut u8,
count: usize,
) -> Result<(), hbvm::mem::LoadError> {
log::dbg!(
"load: {:x} {:?}",
addr.get(),
core::slice::from_raw_parts(addr.get() as *const u8, count)
.iter()
.rev()
.map(|&b| format!("{b:02x}"))
.collect::<String>()
);
self.mem.load(addr, target, count)
}
unsafe fn store(
&mut self,
addr: hbvm::mem::Address,
source: *const u8,
count: usize,
) -> Result<(), hbvm::mem::StoreError> {
log::dbg!(
"store: {:x} {:?}",
addr.get(),
core::slice::from_raw_parts(source, count)
.iter()
.rev()
.map(|&b| format!("{b:02x}"))
.collect::<String>()
);
self.mem.store(addr, source, count)
}
unsafe fn prog_read<T: Copy>(&mut self, addr: hbvm::mem::Address) -> T {
log::dbg!(
"read-typed: {:x} {} {:?}",
addr.get(),
std::any::type_name::<T>(),
if core::mem::size_of::<T>() == 1
&& let Some(nm) =
instrs::NAMES.get(std::ptr::read(addr.get() as *const u8) as usize)
{
nm.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>()
}
);
self.mem.prog_read(addr)
}
}
const VM_STACK_SIZE: usize = 1024 * 1024 * 2;
struct Comptime {
vm: hbvm::Vm<LoggedMem, 0>,
_stack: Box<[u8; VM_STACK_SIZE]>,
}
impl Default for Comptime {
fn default() -> Self {
let mut stack = Box::<[u8; VM_STACK_SIZE]>::new_uninit();
let mut vm = hbvm::Vm::default();
let ptr = unsafe { stack.as_mut_ptr().cast::<u8>().add(VM_STACK_SIZE) as u64 };
log::dbg!("stack_ptr: {:x}", ptr);
vm.write_reg(STACK_PTR, ptr);
Self { vm, _stack: unsafe { stack.assume_init() } }
}
}
enum Trap {
MakeStruct { file: FileId, struct_expr: ExprRef },
}
struct StringReloc {
reloc: Reloc,
range: std::ops::Range<u32>,
#[cfg(debug_assertions)]
shifted: bool,
}
#[derive(Default)]
pub struct Codegen {
pub files: Vec<parser::Ast>,
tasks: Vec<Option<FTask>>,
tys: Types,
ci: ItemCtx,
output: Output,
pool: Pool,
ct: Comptime,
}
impl Codegen {
pub fn generate(&mut self) {
self.output.emit_entry_prelude();
self.find_or_declare(0, 0, Err("main"), "");
self.complete_call_graph_low();
self.link();
}
pub fn dump(mut self, out: &mut impl std::io::Write) -> std::io::Result<()> {
let reloc = Reloc::shifted(0, 3, 4);
self.output.funcs.push((0, reloc));
self.link();
out.write_all(&self.output.code)
}
fn expr(&mut self, expr: &Expr) -> Option<Value> {
self.expr_ctx(expr, Ctx::default())
}
fn build_struct(&mut self, fields: &[(&str, Expr)]) -> ty::Struct {
let fields = fields
.iter()
.map(|&(name, ty)| Field { name: name.into(), ty: self.ty(&ty) })
.collect();
self.tys.structs.push(Struct { fields });
self.tys.structs.len() as u32 - 1
}
fn expr_ctx(&mut self, expr: &Expr, mut ctx: Ctx) -> Option<Value> {
use {Expr as E, TokenKind as T};
let value = match *expr {
E::Mod { id, .. } => Some(Value::ty(ty::Kind::Module(id).compress())),
E::Struct { fields, captured, .. } => {
if captured.is_empty() {
Some(Value::ty(ty::Kind::Struct(self.build_struct(fields)).compress()))
} else {
let values = captured
.iter()
.map(|&id| E::Ident { pos: 0, id, name: "booodab", index: u16::MAX })
.map(|expr| self.expr(&expr))
.collect::<Option<Vec<_>>>()?;
let values_size =
values.iter().map(|value| 4 + self.tys.size_of(value.ty)).sum::<Size>();
let stack = self.ci.stack.allocate(values_size);
let mut ptr = Loc::stack(stack.as_ref());
for value in values {
self.store_sized(Loc::ty(value.ty), &ptr, 4);
ptr = ptr.offset(4);
let size = self.tys.size_of(value.ty);
self.store_sized(value.loc, &ptr, size);
ptr = ptr.offset(size);
}
self.stack_offset(2, STACK_PTR, Some(&stack), 0);
let val = self.eca(
Trap::MakeStruct { file: self.ci.file, struct_expr: ExprRef::new(expr) },
ty::TYPE,
);
self.ci.free_loc(Loc::stack(stack));
Some(val)
}
}
E::UnOp { op: T::Xor, val, .. } => {
let val = self.ty(val);
Some(Value::ty(self.tys.make_ptr(val)))
}
E::Directive { name: "TypeOf", args: [expr], .. } => {
let snap = self.output.snap();
let value = self.expr(expr).unwrap();
self.ci.free_loc(value.loc);
self.output.trunc(&snap);
Some(Value::ty(value.ty))
}
E::Directive { name: "eca", args: [ret_ty, args @ ..], .. } => {
let ty = self.ty(ret_ty);
let mut parama = self.tys.parama(ty);
let base = self.pool.arg_locs.len();
for arg in args {
let arg = self.expr(arg)?;
self.pass_arg(&arg, &mut parama);
self.pool.arg_locs.push(arg.loc);
}
for value in self.pool.arg_locs.drain(base..) {
self.ci.free_loc(value);
}
let loc = self.alloc_ret(ty, ctx);
self.output.emit(eca());
self.load_ret(ty, &loc);
return Some(Value { ty, loc });
}
E::Directive { name: "sizeof", args: [ty], .. } => {
let ty = self.ty(ty);
return Some(Value::imm(self.tys.size_of(ty) as _));
}
E::Directive { name: "alignof", args: [ty], .. } => {
let ty = self.ty(ty);
return Some(Value::imm(self.tys.align_of(ty) as _));
}
E::Directive { name: "intcast", args: [val], .. } => {
let Some(ty) = ctx.ty else {
self.report(
expr.pos(),
"type to cast to is unknown, use `@as(<type>, <expr>)`",
);
};
let mut val = self.expr(val)?;
let from_size = self.tys.size_of(val.ty);
let to_size = self.tys.size_of(ty);
if from_size < to_size && val.ty.is_signed() {
let reg = self.loc_to_reg(val.loc, from_size);
let op = [sxt8, sxt16, sxt32][from_size.ilog2() as usize];
self.output.emit(op(reg.get(), reg.get()));
val.loc = Loc::reg(reg);
}
Some(Value { ty, loc: val.loc })
}
E::Directive { name: "bitcast", args: [val], .. } => {
let Some(ty) = ctx.ty else {
self.report(
expr.pos(),
"type to cast to is unknown, use `@as(<type>, <expr>)`",
);
};
let size = self.tys.size_of(ty);
ctx.ty = None;
let val = self.expr_ctx(val, ctx)?;
if self.tys.size_of(val.ty) != size {
self.report(
expr.pos(),
format_args!(
"cannot bitcast {} to {} (different sizes: {} != {size})",
self.ty_display(val.ty),
self.ty_display(ty),
self.tys.size_of(val.ty),
),
);
}
debug_assert_eq!(
self.tys.align_of(val.ty),
self.tys.align_of(ty),
"TODO: might need stack relocation"
);
return Some(Value { ty, loc: val.loc });
}
E::Directive { name: "as", args: [ty, val], .. } => {
let ty = self.ty(ty);
ctx.ty = Some(ty);
return self.expr_ctx(val, ctx);
}
E::Bool { value, .. } => {
Some(Value { ty: ty::BOOL.into(), loc: Loc::imm(value as u64) })
}
E::String { pos, mut literal } => {
literal = literal.trim_matches('"');
if !literal.ends_with("\\0") {
self.report(pos, "string literal must end with null byte (for now)");
}
let report = |s: &Codegen, bytes: &std::str::Bytes, message| {
s.report(pos + (literal.len() - bytes.len()) as u32 - 1, message)
};
let start = self.output.string_data.len();
let decode_braces = |s: &mut Codegen, bytes: &mut std::str::Bytes| {
while let Some(b) = bytes.next()
&& b != b'}'
{
let c = bytes
.next()
.unwrap_or_else(|| report(s, bytes, "incomplete escape sequence"));
let decode = |s: &Codegen, b: u8| match b {
b'0'..=b'9' => b - b'0',
b'a'..=b'f' => b - b'a' + 10,
b'A'..=b'F' => b - b'A' + 10,
_ => report(s, bytes, "expected hex digit or '}'"),
};
s.output.string_data.push(decode(s, b) << 4 | decode(s, c));
}
};
let mut bytes = literal.bytes();
while let Some(b) = bytes.next() {
if b != b'\\' {
self.output.string_data.push(b);
continue;
}
let b = match bytes
.next()
.unwrap_or_else(|| report(self, &bytes, "incomplete escape sequence"))
{
b'n' => b'\n',
b'r' => b'\r',
b't' => b'\t',
b'\\' => b'\\',
b'\'' => b'\'',
b'"' => b'"',
b'0' => b'\0',
b'{' => {
decode_braces(self, &mut bytes);
continue;
}
_ => report(self, &bytes, "unknown escape sequence, expected [nrt\\\"'{0]"),
};
self.output.string_data.push(b);
}
let range = start as _..self.output.string_data.len() as _;
let reloc = Reloc::new(self.local_offset() as _, 3, 4);
self.output.strings.push(StringReloc {
reloc,
range,
#[cfg(debug_assertions)]
shifted: false,
});
let reg = self.ci.regs.allocate();
self.output.emit(instrs::lra(reg.get(), 0, 0));
Some(Value::new(self.tys.make_ptr(ty::U8.into()), reg))
}
E::Ctor { pos, ty, fields, .. } => {
let (stuct, loc) = self.prepare_struct_ctor(pos, ctx, ty, fields.len());
for &CtorField { pos, name, ref value, .. } in fields {
let Some((offset, ty)) = self.tys.offset_of(stuct, name) else {
self.report(pos, format_args!("field not found: {name:?}"));
};
let loc = loc.as_ref().offset(offset);
let value = self.expr_ctx(value, Ctx::default().with_loc(loc).with_ty(ty))?;
self.ci.free_loc(value.loc);
}
let ty = ty::Kind::Struct(stuct).compress();
return Some(Value { ty, loc });
}
E::Tupl { pos, ty, fields, .. } => {
let (stuct, loc) = self.prepare_struct_ctor(pos, ctx, ty, fields.len());
let mut offset = 0;
let sfields = self.tys.structs[stuct as usize].fields.clone();
for (sfield, field) in sfields.iter().zip(fields) {
let loc = loc.as_ref().offset(offset);
let ctx = Ctx::default().with_loc(loc).with_ty(sfield.ty);
let value = self.expr_ctx(field, ctx)?;
self.ci.free_loc(value.loc);
offset += self.tys.size_of(sfield.ty);
offset = Types::align_up(offset, self.tys.align_of(sfield.ty));
}
let ty = ty::Kind::Struct(stuct).compress();
return Some(Value { ty, loc });
}
E::Field { target, name: field } => {
let checkpoint = self.local_snap();
let mut tal = self.expr(target)?;
if let ty::Kind::Ptr(ty) = tal.ty.expand() {
tal.ty = self.tys.ptrs[ty as usize].base;
tal.loc = tal.loc.into_derefed();
}
match tal.ty.expand() {
ty::Kind::Struct(idx) => {
let Some((offset, ty)) = self.tys.offset_of(idx, field) else {
self.report(target.pos(), format_args!("field not found: {field:?}"));
};
Some(Value { ty, loc: tal.loc.offset(offset) })
}
ty::Kind::Builtin(ty::TYPE) => {
self.ci.free_loc(tal.loc);
self.pop_local_snap(checkpoint);
match ty::Kind::from_ty(self.ty(target)) {
ty::Kind::Module(idx) => {
match self.find_or_declare(target.pos(), idx, Err(field), "") {
ty::Kind::Global(idx) => self.handle_global(idx),
e => Some(Value::ty(e.compress())),
}
}
ty::Kind::Global(idx) => self.handle_global(idx),
e => unimplemented!("{e:?}"),
}
}
smh => self.report(
target.pos(),
format_args!("the field operation is not supported: {smh:?}"),
),
}
}
E::UnOp { op: T::Band, val, pos } => {
let mut val = self.expr(val)?;
let Loc::Rt { derefed: drfd @ true, reg, stack, offset } = &mut val.loc else {
self.report(
pos,
format_args!(
"cant take pointer of {} ({:?})",
self.ty_display(val.ty),
val.loc
),
);
};
*drfd = false;
let offset = std::mem::take(offset) as _;
if reg.is_ref() {
let new_reg = self.ci.regs.allocate();
self.stack_offset(new_reg.get(), reg.get(), stack.as_ref(), offset);
*reg = new_reg;
} else {
self.stack_offset(reg.get(), reg.get(), stack.as_ref(), offset);
}
// FIXME: we might be able to track this but it will be pain
std::mem::forget(stack.take());
Some(Value { ty: self.tys.make_ptr(val.ty), loc: val.loc })
}
E::UnOp { op: T::Mul, val, pos } => {
let val = self.expr(val)?;
match val.ty.expand() {
ty::Kind::Ptr(ty) => Some(Value {
ty: self.tys.ptrs[ty as usize].base,
loc: Loc::reg(self.loc_to_reg(val.loc, self.tys.size_of(val.ty)))
.into_derefed(),
}),
_ => self.report(
pos,
format_args!("expected pointer, got {}", self.ty_display(val.ty)),
),
}
}
E::BinOp { left, op: T::Decl, right } => {
let value = self.expr(right)?;
self.assign_pattern(left, value)
}
E::Call { func: fast, args, .. } => {
log::dbg!("call {fast}");
let func_ty = self.ty(fast);
let ty::Kind::Func(mut func_id) = func_ty.expand() else {
self.report(fast.pos(), "can't call this, maybe in the future");
};
let func = self.tys.funcs[func_id as usize];
let ast = self.files[func.file as usize].clone();
let E::BinOp { right: &E::Closure { args: cargs, ret, .. }, .. } =
func.expr.get(&ast).unwrap()
else {
unreachable!();
};
let sig = if let Some(sig) = func.sig {
sig
} else {
let scope = self.ci.vars.len();
let arg_base = self.tys.args.len();
for (arg, carg) in args.iter().zip(cargs) {
let ty = self.ty(&carg.ty);
log::dbg!("arg: {}", self.ty_display(ty));
self.tys.args.push(ty);
let sym = parser::find_symbol(&ast.symbols, carg.id);
let loc = if sym.flags & idfl::COMPTIME == 0 {
// FIXME: could fuck us
Loc::default()
} else {
debug_assert_eq!(
ty,
ty::TYPE.into(),
"TODO: we dont support anything except type generics"
);
let arg = self.expr_ctx(arg, Ctx::default().with_ty(ty))?;
self.tys.args.push(arg.loc.to_ty().unwrap());
arg.loc
};
self.ci.vars.push(Variable { id: carg.id, value: Value { ty, loc } });
}
let args = self.pack_args(expr.pos(), arg_base);
let ret = self.ty(ret);
self.ci.vars.truncate(scope);
let sym = SymKey { file: !args.repr(), ident: func_id };
let ct = || {
let func_id = self.tys.funcs.len();
self.tys.funcs.push(Func {
file: func.file,
offset: task::id(func_id),
sig: Some(Sig { args, ret }),
expr: func.expr,
});
self.tasks.push(Some(FTask {
// FIXME: this will fuck us
file: self.ci.file,
id: func_id as _,
}));
ty::Kind::Func(func_id as _).compress()
};
func_id = self.tys.syms.entry(sym).or_insert_with(ct).expand().inner();
Sig { args, ret }
};
let mut parama = self.tys.parama(sig.ret);
let mut values = Vec::with_capacity(args.len());
let mut sig_args = sig.args.range();
for (arg, carg) in args.iter().zip(cargs) {
let ty = self.tys.args[sig_args.next().unwrap()];
let sym = parser::find_symbol(&ast.symbols, carg.id);
if sym.flags & idfl::COMPTIME != 0 {
sig_args.next().unwrap();
continue;
}
// TODO: pass the arg as dest
let varg = self.expr_ctx(arg, Ctx::default().with_ty(ty))?;
self.pass_arg(&varg, &mut parama);
values.push(varg.loc);
}
for value in values {
self.ci.free_loc(value);
}
log::dbg!("call ctx: {ctx:?}");
let loc = self.alloc_ret(sig.ret, ctx);
let reloc = Reloc::new(self.local_offset(), 3, 4);
self.output.funcs.push((func_id, reloc));
self.output.emit(jal(RET_ADDR, ZERO, 0));
self.load_ret(sig.ret, &loc);
return Some(Value { ty: sig.ret, loc });
}
E::Ident { id, .. } if ident::is_null(id) => Some(Value::ty(id.into())),
E::Ident { id, index, .. }
if let Some((var_index, var)) =
self.ci.vars.iter_mut().enumerate().find(|(_, v)| v.id == id) =>
{
let sym = parser::find_symbol(&self.files[self.ci.file as usize].symbols, id);
let loc = match idfl::index(sym.flags) == index
&& !self.ci.loops.last().is_some_and(|l| l.var_count > var_index as u32)
{
true => std::mem::take(&mut var.value.loc),
false => var.value.loc.as_ref(),
};
Some(Value { ty: self.ci.vars[var_index].value.ty, loc })
}
E::Ident { id, name, .. } => match self
.tys
.syms
.get(&SymKey { ident: id, file: self.ci.file })
.copied()
.map(ty::Kind::from_ty)
.unwrap_or_else(|| self.find_or_declare(ident::pos(id), self.ci.file, Ok(id), name))
{
ty::Kind::Global(id) => self.handle_global(id),
tk => Some(Value::ty(tk.compress())),
},
E::Return { val, .. } => {
if let Some(val) = val {
let size = self.tys.size_of(self.ci.ret);
let loc = match size {
0 => Loc::default(),
1..=16 => Loc::reg(1),
_ => Loc::reg(self.ci.ret_reg.as_ref()).into_derefed(),
};
self.expr_ctx(val, Ctx::default().with_ty(self.ci.ret).with_loc(loc))?;
}
self.ci.ret_relocs.push(Reloc::new(self.local_offset(), 1, 4));
self.output.emit(jmp(0));
None
}
E::Block { stmts, .. } => {
for stmt in stmts {
self.expr(stmt)?;
}
Some(Value::void())
}
E::Number { value, .. } => Some(Value {
ty: ctx.ty.map(ty::Id::strip_pointer).unwrap_or(ty::INT.into()),
loc: Loc::imm(value),
}),
E::If { cond, then, else_, .. } => {
log::dbg!("if-cond");
let cond = self.expr_ctx(cond, Ctx::default().with_ty(ty::BOOL))?;
let reg = self.loc_to_reg(&cond.loc, 1);
let jump_offset = self.local_offset();
self.output.emit(jeq(reg.get(), 0, 0));
self.ci.free_loc(cond.loc);
log::dbg!("if-then");
let then_unreachable = self.expr(then).is_none();
let mut else_unreachable = false;
let mut jump = self.local_offset() as i64 - jump_offset as i64;
if let Some(else_) = else_ {
log::dbg!("if-else");
let else_jump_offset = self.local_offset();
if !then_unreachable {
self.output.emit(jmp(0));
jump = self.local_offset() as i64 - jump_offset as i64;
}
else_unreachable = self.expr(else_).is_none();
if !then_unreachable {
let jump = self.local_offset() as i64 - else_jump_offset as i64;
log::dbg!("if-else-jump: {}", jump);
write_reloc(self.local_code(), else_jump_offset as usize + 1, jump, 4);
}
}
log::dbg!("if-then-jump: {}", jump);
write_reloc(self.local_code(), jump_offset as usize + 3, jump, 2);
(!then_unreachable || !else_unreachable).then_some(Value::void())
}
E::Loop { body, .. } => 'a: {
log::dbg!("loop");
let loop_start = self.local_offset();
self.ci.loops.push(Loop {
var_count: self.ci.vars.len() as _,
offset: loop_start,
reloc_base: self.ci.loop_relocs.len() as u32,
});
let body_unreachable = self.expr(body).is_none();
log::dbg!("loop-end");
if !body_unreachable {
let loop_end = self.local_offset();
self.output.emit(jmp(loop_start as i32 - loop_end as i32));
}
let loop_end = self.local_offset();
let loopa = self.ci.loops.pop().unwrap();
let is_unreachable = loopa.reloc_base == self.ci.loop_relocs.len() as u32;
for reloc in self.ci.loop_relocs.drain(loopa.reloc_base as usize..) {
reloc.apply_jump(&mut self.output.code[self.ci.snap.code..], loop_end);
}
let mut vars = std::mem::take(&mut self.ci.vars);
for var in vars.drain(loopa.var_count as usize..) {
self.ci.free_loc(var.value.loc);
}
self.ci.vars = vars;
if is_unreachable {
log::dbg!("infinite loop");
break 'a None;
}
Some(Value::void())
}
E::Break { .. } => {
self.ci.loop_relocs.push(Reloc::shifted(self.local_offset(), 1, 4));
self.output.emit(jmp(0));
None
}
E::Continue { .. } => {
let loop_ = self.ci.loops.last().unwrap();
let offset = self.local_offset();
self.output.emit(jmp(loop_.offset as i32 - offset as i32));
None
}
E::BinOp { left, op: op @ (T::And | T::Or), right } => {
let lhs = self.expr_ctx(left, Ctx::default().with_ty(ty::BOOL))?;
let lhs = self.loc_to_reg(lhs.loc, 1);
let jump_offset = self.output.code.len() + 3;
let op = if op == T::And { jeq } else { jne };
self.output.emit(op(lhs.get(), 0, 0));
if let Some(rhs) = self.expr_ctx(right, Ctx::default().with_ty(ty::BOOL)) {
let rhs = self.loc_to_reg(rhs.loc, 1);
self.output.emit(cp(lhs.get(), rhs.get()));
}
let jump = self.output.code.len() as i64 - jump_offset as i64;
write_reloc(&mut self.output.code, jump_offset, jump, 2);
Some(Value { ty: ty::BOOL.into(), loc: Loc::reg(lhs) })
}
E::BinOp { left, op, right } if op != T::Decl => 'ops: {
let left = self.expr(left)?;
if op == T::Assign {
let value = self.expr_ctx(right, Ctx::from(left)).unwrap();
self.ci.free_loc(value.loc);
return Some(Value::void());
}
if let ty::Kind::Struct(_) = left.ty.expand() {
let right = self.expr_ctx(right, Ctx::default().with_ty(left.ty))?;
_ = self.assert_ty(expr.pos(), left.ty, right.ty);
return self.struct_op(op, left.ty, ctx, left.loc, right.loc);
}
let lsize = self.tys.size_of(left.ty);
let lhs = self.loc_to_reg(left.loc, lsize);
log::dbg!("{expr}");
let right = self.expr_ctx(right, Ctx::default().with_ty(left.ty))?;
let rsize = self.tys.size_of(right.ty);
let ty = self.assert_ty(expr.pos(), left.ty, right.ty);
let size = self.tys.size_of(ty);
let signed = ty.is_signed();
if let Loc::Ct { value } = right.loc
&& let Some(oper) = Self::imm_math_op(op, signed, size)
{
let mut imm = u64::from_ne_bytes(value);
if matches!(op, T::Add | T::Sub)
&& let ty::Kind::Ptr(ty) = ty::Kind::from_ty(ty)
{
let size = self.tys.size_of(self.tys.ptrs[ty as usize].base);
imm *= size as u64;
}
self.output.emit(oper(lhs.get(), lhs.get(), imm));
break 'ops Some(Value::new(ty, lhs));
}
let rhs = self.loc_to_reg(right.loc, rsize);
if matches!(op, T::Add | T::Sub) {
let min_size = lsize.min(rsize);
if ty.is_signed() && min_size < size {
let operand = if lsize < rsize { lhs.get() } else { rhs.get() };
let op = [sxt8, sxt16, sxt32][min_size.ilog2() as usize];
self.output.emit(op(operand, operand));
}
if left.ty.is_pointer() ^ right.ty.is_pointer() {
let (offset, ty) = if left.ty.is_pointer() {
(rhs.get(), left.ty)
} else {
(lhs.get(), right.ty)
};
let ty::Kind::Ptr(ty) = ty.expand() else { unreachable!() };
let size = self.tys.size_of(self.tys.ptrs[ty as usize].base);
self.output.emit(muli64(offset, offset, size as _));
}
}
if let Some(op) = Self::math_op(op, signed, size) {
self.output.emit(op(lhs.get(), lhs.get(), rhs.get()));
self.ci.regs.free(rhs);
break 'ops Some(Value::new(ty, lhs));
}
'cmp: {
let against = match op {
T::Le | T::Gt => 1,
T::Ne | T::Eq => 0,
T::Ge | T::Lt => (-1i64) as _,
_ => break 'cmp,
};
let op_fn = if signed { cmps } else { cmpu };
self.output.emit(op_fn(lhs.get(), lhs.get(), rhs.get()));
self.output.emit(cmpui(lhs.get(), lhs.get(), against));
if matches!(op, T::Eq | T::Lt | T::Gt) {
self.output.emit(not(lhs.get(), lhs.get()));
}
self.ci.regs.free(rhs);
break 'ops Some(Value::new(ty::BOOL, lhs));
}
unimplemented!("{:#?}", op)
}
E::Comment { .. } => Some(Value::void()),
ast => self.report(
ast.pos(),
format_args!(
"compiler does not (yet) konw how to handle:\n\
{ast:}\n\
info for weak people:\n\
{ast:#?}"
),
),
}?;
if let Some(ty) = ctx.ty {
_ = self.assert_ty(expr.pos(), value.ty, ty);
}
Some(match ctx.loc {
Some(dest) => {
let ty = ctx.ty.unwrap_or(value.ty);
self.store_typed(value.loc, dest, ty);
Value { ty, loc: Loc::imm(0) }
}
None => value,
})
}
fn assign_pattern(&mut self, pat: &Expr, right: Value) -> Option<Value> {
match *pat {
Expr::Ident { id, .. } => {
let mut loc = self.make_loc_owned(right.loc, right.ty);
let sym = parser::find_symbol(&self.cfile().symbols, id);
if sym.flags & idfl::REFERENCED != 0 {
loc = self.spill(loc, self.tys.size_of(right.ty));
}
self.ci.vars.push(Variable { id, value: Value { ty: right.ty, loc } });
}
Expr::Ctor { pos, fields, .. } => {
let ty::Kind::Struct(idx) = right.ty.expand() else {
self.report(pos, "can't use struct destruct on non struct value (TODO: shold work with modules)");
};
for &CtorField { pos, name, ref value } in fields {
let Some((offset, ty)) = self.tys.offset_of(idx, name) else {
self.report(pos, format_args!("field not found: {name:?}"));
};
let loc = self.ci.dup_loc(&right.loc).offset(offset);
self.assign_pattern(value, Value::new(ty, loc));
}
self.ci.free_loc(right.loc);
}
pat => self.report(
pat.pos(),
format_args!(
"compiler does not (yet) konw how to handle:\n\
{pat:}\n\
info for weak people:\n\
{pat:#?}"
),
),
};
Some(Value::void())
}
fn prepare_struct_ctor(
&mut self,
pos: Pos,
ctx: Ctx,
ty: Option<&Expr>,
field_len: usize,
) -> (ty::Struct, Loc) {
let Some(ty) = ty.map(|ty| self.ty(ty)).or(ctx.ty) else {
self.report(pos, "expected type, (it cannot be inferred)");
};
let size = self.tys.size_of(ty);
let loc = ctx.loc.unwrap_or_else(|| Loc::stack(self.ci.stack.allocate(size)));
let ty::Kind::Struct(stuct) = ty.expand() else {
self.report(pos, "expected expression to evaluate to struct")
};
let field_count = self.tys.structs[stuct as usize].fields.len();
if field_count != field_len {
self.report(pos, format_args!("expected {field_count} fields, got {field_len}"));
}
(stuct, loc)
}
fn struct_op(
&mut self,
op: TokenKind,
ty: ty::Id,
ctx: Ctx,
left: Loc,
mut right: Loc,
) -> Option<Value> {
if let ty::Kind::Struct(stuct) = ty.expand() {
let loc = ctx
.loc
.or_else(|| right.take_owned())
.unwrap_or_else(|| Loc::stack(self.ci.stack.allocate(self.tys.size_of(ty))));
let mut offset = 0;
for &Field { ty, .. } in self.tys.structs[stuct as usize].fields.clone().iter() {
offset = Types::align_up(offset, self.tys.align_of(ty));
let size = self.tys.size_of(ty);
let ctx = Ctx::from(Value { ty, loc: loc.as_ref().offset(offset) });
let left = left.as_ref().offset(offset);
let right = right.as_ref().offset(offset);
let value = self.struct_op(op, ty, ctx, left, right)?;
self.ci.free_loc(value.loc);
offset += size;
}
self.ci.free_loc(left);
self.ci.free_loc(right);
return Some(Value { ty, loc });
}
let size = self.tys.size_of(ty);
let signed = ty.is_signed();
let lhs = self.loc_to_reg(left, size);
if let Loc::Ct { value } = right
&& let Some(op) = Self::imm_math_op(op, signed, size)
{
self.output.emit(op(lhs.get(), lhs.get(), u64::from_ne_bytes(value)));
return Some(if let Some(value) = ctx.into_value() {
self.store_typed(Loc::reg(lhs.as_ref()), value.loc, value.ty);
Value::void()
} else {
Value { ty, loc: Loc::reg(lhs) }
});
}
let rhs = self.loc_to_reg(right, size);
if let Some(op) = Self::math_op(op, signed, size) {
self.output.emit(op(lhs.get(), lhs.get(), rhs.get()));
self.ci.regs.free(rhs);
return if let Some(value) = ctx.into_value() {
self.store_typed(Loc::reg(lhs), value.loc, value.ty);
Some(Value::void())
} else {
Some(Value { ty, loc: Loc::reg(lhs) })
};
}
unimplemented!("{:#?}", op)
}
#[allow(clippy::type_complexity)]
fn math_op(
op: TokenKind,
signed: bool,
size: u32,
) -> Option<fn(u8, u8, u8) -> (usize, [u8; instrs::MAX_SIZE])> {
use TokenKind as T;
macro_rules! div { ($($op:ident),*) => {[$(|a, b, c| $op(a, ZERO, b, c)),*]}; }
macro_rules! rem { ($($op:ident),*) => {[$(|a, b, c| $op(ZERO, a, b, c)),*]}; }
let ops = match op {
T::Add => [add8, add16, add32, add64],
T::Sub => [sub8, sub16, sub32, sub64],
T::Mul => [mul8, mul16, mul32, mul64],
T::Div if signed => div!(dirs8, dirs16, dirs32, dirs64),
T::Div => div!(diru8, diru16, diru32, diru64),
T::Mod if signed => rem!(dirs8, dirs16, dirs32, dirs64),
T::Mod => rem!(diru8, diru16, diru32, diru64),
T::Band => return Some(and),
T::Bor => return Some(or),
T::Xor => return Some(xor),
T::Shl => [slu8, slu16, slu32, slu64],
T::Shr if signed => [srs8, srs16, srs32, srs64],
T::Shr => [sru8, sru16, sru32, sru64],
_ => return None,
};
Some(ops[size.ilog2() as usize])
}
#[allow(clippy::type_complexity)]
fn imm_math_op(
op: TokenKind,
signed: bool,
size: u32,
) -> Option<fn(u8, u8, u64) -> (usize, [u8; instrs::MAX_SIZE])> {
use TokenKind as T;
macro_rules! def_op {
($name:ident |$a:ident, $b:ident, $c:ident| $($tt:tt)*) => {
macro_rules! $name {
($$($$op:ident),*) => {
[$$(
|$a, $b, $c: u64| $$op($($tt)*),
)*]
}
}
};
}
def_op!(basic_op | a, b, c | a, b, c as _);
def_op!(sub_op | a, b, c | b, a, c.wrapping_neg() as _);
let ops = match op {
T::Add => basic_op!(addi8, addi16, addi32, addi64),
T::Sub => sub_op!(addi8, addi16, addi32, addi64),
T::Mul => basic_op!(muli8, muli16, muli32, muli64),
T::Band => return Some(andi),
T::Bor => return Some(ori),
T::Xor => return Some(xori),
T::Shr if signed => basic_op!(srui8, srui16, srui32, srui64),
T::Shr => basic_op!(srui8, srui16, srui32, srui64),
T::Shl => basic_op!(slui8, slui16, slui32, slui64),
_ => return None,
};
Some(ops[size.ilog2() as usize])
}
fn handle_global(&mut self, id: ty::Global) -> Option<Value> {
let ptr = self.ci.regs.allocate();
let reloc = Reloc::new(self.local_offset(), 3, 4);
let global = &mut self.tys.globals[id as usize];
self.output.globals.push((id, reloc));
log::dbg!("{}", self.output.globals.len() - self.ci.snap.globals);
self.output.emit(instrs::lra(ptr.get(), 0, 0));
Some(Value { ty: global.ty, loc: Loc::reg(ptr).into_derefed() })
}
fn spill(&mut self, loc: Loc, size: Size) -> Loc {
let stack = Loc::stack(self.ci.stack.allocate(size));
self.store_sized(loc, &stack, size);
stack
}
fn make_loc_owned(&mut self, loc: Loc, ty: ty::Id) -> Loc {
let size = self.tys.size_of(ty);
match size {
0 => Loc::default(),
1..=8 => Loc::reg(self.loc_to_reg(loc, size)),
_ if loc.is_ref() => {
let new_loc = Loc::stack(self.ci.stack.allocate(size));
self.store_sized(loc, &new_loc, size);
new_loc
}
_ => loc,
}
}
#[must_use]
fn complete_call_graph(&mut self) -> Output {
let stash = self.pop_stash();
self.complete_call_graph_low();
self.ci.snap = self.output.snap();
stash
}
fn complete_call_graph_low(&mut self) {
while self.ci.task_base < self.tasks.len()
&& let Some(task_slot) = self.tasks.pop()
{
let Some(task) = task_slot else { continue };
self.handle_task(task);
}
let base = self.output.code.len() as u32;
let prev_data_len = self.output.string_data.len();
self.output.code.append(&mut self.output.string_data);
for srel in self.output.strings.iter_mut() {
#[cfg(debug_assertions)]
{
if std::mem::replace(&mut srel.shifted, true) {
panic!("str reloc visited twice");
}
}
debug_assert!(srel.range.end <= prev_data_len as u32);
debug_assert!(srel.range.start <= srel.range.end);
srel.range.start += base;
srel.range.end += base;
}
}
fn handle_task(&mut self, FTask { file, id }: FTask) {
let func = self.tys.funcs[id as usize];
let sig = func.sig.unwrap();
let ast = self.files[file as usize].clone();
let expr = func.expr.get(&ast).unwrap();
let repl = ItemCtx {
file,
id: ty::Kind::Func(id),
ret: sig.ret,
..self.pool.cis.pop().unwrap_or_default()
};
let prev_ci = std::mem::replace(&mut self.ci, repl);
self.ci.regs.init();
self.ci.snap = self.output.snap();
let Expr::BinOp {
left: Expr::Ident { name, .. },
op: TokenKind::Decl,
right: &Expr::Closure { body, args, .. },
} = expr
else {
unreachable!("{expr}")
};
log::dbg!("fn: {}", name);
self.output.emit_prelude();
log::dbg!("fn-args");
let mut parama = self.tys.parama(self.ci.ret);
let mut sig_args = sig.args.range();
for arg in args.iter() {
let ty = self.tys.args[sig_args.next().unwrap()];
let sym = parser::find_symbol(&ast.symbols, arg.id);
let loc = match sym.flags & idfl::COMPTIME != 0 {
true => Loc::ty(self.tys.args[sig_args.next().unwrap()]),
false => self.load_arg(sym.flags, ty, &mut parama),
};
self.ci.vars.push(Variable { id: arg.id, value: Value { ty, loc } });
}
if self.tys.size_of(self.ci.ret) > 16 {
let reg = self.ci.regs.allocate();
self.output.emit(instrs::cp(reg.get(), 1));
self.ci.ret_reg = reg;
} else {
self.ci.ret_reg = reg::Id::RET;
}
log::dbg!("fn-body");
if self.expr(body).is_some() {
self.report(body.pos(), "expected all paths in the fucntion to return");
}
for vars in self.ci.vars.drain(..).collect::<Vec<_>>() {
self.ci.free_loc(vars.value.loc);
}
log::dbg!("fn-prelude, stack: {:x}", self.ci.stack.max_height);
log::dbg!("fn-relocs");
self.ci.finalize(&mut self.output);
self.output.emit(jala(ZERO, RET_ADDR, 0));
self.ci.regs.free(std::mem::take(&mut self.ci.ret_reg));
self.tys.funcs[id as usize].offset = self.ci.snap.code as Offset;
self.pool.cis.push(std::mem::replace(&mut self.ci, prev_ci));
}
fn load_arg(&mut self, flags: parser::IdentFlags, ty: ty::Id, parama: &mut ParamAlloc) -> Loc {
let size = self.tys.size_of(ty) as Size;
if size == 0 {
return Loc::default();
}
let (src, dst) = match size {
0 => (Loc::default(), Loc::default()),
..=8 if flags & idfl::REFERENCED == 0 => {
(Loc::reg(parama.next()), Loc::reg(self.ci.regs.allocate()))
}
1..=8 => (Loc::reg(parama.next()), Loc::stack(self.ci.stack.allocate(size))),
9..=16 => (Loc::reg(parama.next_wide()), Loc::stack(self.ci.stack.allocate(size))),
_ if flags & (idfl::MUTABLE | idfl::REFERENCED) == 0 => {
let ptr = parama.next();
let reg = self.ci.regs.allocate();
self.output.emit(instrs::cp(reg.get(), ptr));
return Loc::reg(reg).into_derefed();
}
_ => (Loc::reg(parama.next()).into_derefed(), Loc::stack(self.ci.stack.allocate(size))),
};
self.store_sized(src, &dst, size);
dst
}
fn eca(&mut self, trap: Trap, ret: impl Into<ty::Id>) -> Value {
self.output.emit(eca());
self.output.write_trap(trap);
Value { ty: ret.into(), loc: Loc::reg(1) }
}
fn alloc_ret(&mut self, ret: ty::Id, ctx: Ctx) -> Loc {
let size = self.tys.size_of(ret);
match size {
0 => Loc::default(),
1..=8 => Loc::reg(1),
9..=16 => Loc::stack(self.ci.stack.allocate(size)),
_ => {
let loc = ctx.loc.unwrap_or_else(|| Loc::stack(self.ci.stack.allocate(size)));
let Loc::Rt { reg, stack, offset, .. } = &loc else {
todo!("old man with the beard looks at the sky scared");
};
self.stack_offset(1, reg.get(), stack.as_ref(), *offset);
loc
}
}
}
fn loc_to_reg(&mut self, loc: impl Into<LocCow>, size: Size) -> reg::Id {
match loc.into() {
LocCow::Owned(Loc::Rt { derefed: false, mut reg, offset, stack }) => {
debug_assert!(stack.is_none(), "TODO");
assert_eq!(offset, 0, "TODO");
if reg.is_ref() {
let new_reg = self.ci.regs.allocate();
self.output.emit(cp(new_reg.get(), reg.get()));
reg = new_reg;
}
reg
}
LocCow::Ref(&Loc::Rt { derefed: false, ref reg, offset, ref stack }) => {
debug_assert!(stack.is_none(), "TODO");
assert_eq!(offset, 0, "TODO");
reg.as_ref()
}
loc => {
let reg = self.ci.regs.allocate();
self.store_sized(loc, Loc::reg(reg.as_ref()), size);
reg
}
}
}
fn load_ret(&mut self, ty: ty::Id, loc: &Loc) {
let size = self.tys.size_of(ty);
if let 1..=16 = size {
self.store_sized(Loc::reg(1), loc, size);
}
}
fn pass_arg(&mut self, value: &Value, parama: &mut ParamAlloc) {
self.pass_arg_low(&value.loc, self.tys.size_of(value.ty), parama)
}
fn pass_arg_low(&mut self, loc: &Loc, size: Size, parama: &mut ParamAlloc) {
if size > 16 {
let Loc::Rt { reg, stack, offset, .. } = loc else { unreachable!() };
self.stack_offset(parama.next(), reg.get(), stack.as_ref(), *offset as _);
return;
}
let dst = match size {
0 => return,
9..=16 => Loc::reg(parama.next_wide()),
_ => Loc::reg(parama.next()),
};
self.store_sized(loc, dst, size);
}
fn store_typed(&mut self, src: impl Into<LocCow>, dst: impl Into<LocCow>, ty: ty::Id) {
self.store_sized(src, dst, self.tys.size_of(ty) as _)
}
fn store_sized(&mut self, src: impl Into<LocCow>, dst: impl Into<LocCow>, size: Size) {
self.store_sized_low(src.into(), dst.into(), size);
}
fn store_sized_low(&mut self, src: LocCow, dst: LocCow, size: Size) {
macro_rules! lpat {
($der:literal, $reg:ident, $off:pat, $sta:pat) => {
&Loc::Rt { derefed: $der, reg: ref $reg, offset: $off, stack: $sta }
};
}
if size == 0 {
return;
}
src.as_ref().assert_valid();
dst.as_ref().assert_valid();
match (src.as_ref(), dst.as_ref()) {
(&Loc::Ct { value }, lpat!(true, reg, off, ref sta)) => {
let ct = self.ci.regs.allocate();
self.output.emit(li64(ct.get(), u64::from_ne_bytes(value)));
let off = self.opt_stack_reloc(sta.as_ref(), off, 3);
self.output.emit(st(ct.get(), reg.get(), off, size as _));
self.ci.regs.free(ct);
}
(&Loc::Ct { value }, lpat!(false, reg, 0, None)) => {
self.output.emit(li64(reg.get(), u64::from_ne_bytes(value)))
}
(lpat!(true, src, soff, ref ssta), lpat!(true, dst, doff, ref dsta)) => {
// TODO: some oportuinies to ellit more optimal code
let src_off = self.ci.regs.allocate();
let dst_off = self.ci.regs.allocate();
self.stack_offset(src_off.get(), src.get(), ssta.as_ref(), soff);
self.stack_offset(dst_off.get(), dst.get(), dsta.as_ref(), doff);
self.output.emit(bmc(src_off.get(), dst_off.get(), size as _));
self.ci.regs.free(src_off);
self.ci.regs.free(dst_off);
}
(lpat!(false, src, 0, None), lpat!(false, dst, 0, None)) => {
if src != dst {
self.output.emit(cp(dst.get(), src.get()));
}
}
(lpat!(true, src, soff, ref ssta), lpat!(false, dst, 0, None)) => {
if size < 8 {
self.output.emit(cp(dst.get(), 0));
}
let off = self.opt_stack_reloc(ssta.as_ref(), soff, 3);
self.output.emit(ld(dst.get(), src.get(), off, size as _));
}
(lpat!(false, src, 0, None), lpat!(true, dst, doff, ref dsta)) => {
let off = self.opt_stack_reloc(dsta.as_ref(), doff, 3);
self.output.emit(st(src.get(), dst.get(), off, size as _))
}
(a, b) => unreachable!("{a:?} {b:?}"),
}
self.ci.free_loc(src);
self.ci.free_loc(dst);
}
fn stack_offset(&mut self, dst: u8, op: u8, stack: Option<&stack::Id>, off: Offset) {
let Some(stack) = stack else {
self.output.emit_addi(dst, op, off as _);
return;
};
let off = self.stack_reloc(stack, off, 3);
self.output.emit(addi64(dst, op, off));
}
fn opt_stack_reloc(&mut self, stack: Option<&stack::Id>, off: Offset, sub_offset: u8) -> u64 {
stack.map(|s| self.stack_reloc(s, off, sub_offset)).unwrap_or(off as _)
}
fn stack_reloc(&mut self, stack: &stack::Id, off: Offset, sub_offset: u8) -> u64 {
log::dbg!("whaaaaatahack: {:b}", stack.repr());
let offset = self.local_offset();
self.ci.stack_relocs.push(Reloc::shifted(offset, sub_offset, 8));
Reloc::pack_srel(stack, off)
}
fn link(&mut self) {
// FIXME: this will cause problems relating snapshots
self.output.funcs.retain(|&(f, rel)| {
_ = task::unpack(self.tys.funcs[f as usize].offset)
.map(|off| rel.apply_jump(&mut self.output.code, off));
true
});
self.output.globals.retain(|&(g, rel)| {
_ = task::unpack(self.tys.globals[g as usize].offset)
.map(|off| rel.apply_jump(&mut self.output.code, off));
true
});
//self.compress_strings();
for srel in self.output.strings.drain(..) {
#[cfg(debug_assertions)]
assert!(srel.shifted);
srel.reloc.apply_jump(&mut self.output.code, srel.range.start);
}
}
//fn compress_strings(&mut self) {
// // FIXME: we can go faster
// self.output
// .strings
// .sort_by(|a, b| self.string_data[b.range()].cmp(&self.string_data[a.range()]));
// let mut cursor = 0;
// let mut anchor = 0;
// for i in 1..self.output.strings.len() {
// let [a, b] = self.output.strings.get_many_mut([anchor, i]).unwrap();
// if self.string_data[a.range()].ends_with(&self.string_data[b.range()]) {
// b.range.end = a.range.end;
// b.range.start = a.range.end - (b.range.end - b.range.start);
// } else {
// self.string_data.copy_within(a.range(), cursor);
// cursor += a.range.len();
// anchor = i;
// }
// }
// if !self.output.strings.is_empty() {
// let a = &self.output.strings[anchor];
// self.string_data.copy_within(a.range(), cursor);
// cursor += a.range.len();
// }
// self.string_data.truncate(cursor)
//}
// TODO: sometimes its better to do this in bulk
fn ty(&mut self, expr: &Expr) -> ty::Id {
let mut ci = ItemCtx {
file: self.ci.file,
id: self.ci.id,
ret: ty::TYPE.into(),
..self.pool.cis.pop().unwrap_or_default()
};
ci.vars.append(&mut self.ci.vars);
let loc = self.ct_eval(ci, |s, prev| {
s.output.emit_prelude();
if s.expr_ctx(
&Expr::Return { pos: 0, val: Some(expr) },
Ctx::default().with_ty(ty::TYPE),
)
.is_some()
{
s.report(expr.pos(), "we fucked up");
};
let stash = s.complete_call_graph();
s.push_stash(stash);
s.dunp_imported_fns();
prev.vars.append(&mut s.ci.vars);
s.ci.finalize(&mut s.output);
s.output.emit(tx());
Ok(1)
});
ty::Id::from(match loc {
Ok(reg) | Err(reg) => self.ct.vm.read_reg(reg).cast::<u64>().to_ne_bytes(),
})
}
fn handle_ecall(&mut self) {
let arr = self.ct.vm.pc.get() as *const Trap;
let trap = unsafe { std::ptr::read_unaligned(arr) };
self.ct.vm.pc = self.ct.vm.pc.wrapping_add(std::mem::size_of::<Trap>());
let local_pc = (self.ct.vm.pc.get() as usize - self.output.code.as_ptr() as usize)
.checked_sub(self.ci.snap.code);
match trap {
Trap::MakeStruct { file, struct_expr } => {
let cfile = self.files[file as usize].clone();
let &Expr::Struct { fields, captured, .. } = struct_expr.get(&cfile).unwrap()
else {
unreachable!()
};
let prev_len = self.ci.vars.len();
let mut values = self.ct.vm.read_reg(2).0 as *const u8;
for &id in captured {
let ty: ty::Id = unsafe { std::ptr::read_unaligned(values.cast()) };
unsafe { values = values.add(4) };
let size = self.tys.size_of(ty) as usize;
let mut imm = [0u8; 8];
assert!(size <= imm.len(), "TODO");
unsafe { std::ptr::copy_nonoverlapping(values, imm.as_mut_ptr(), size) };
self.ci.vars.push(Variable {
id,
value: Value::new(ty, Loc::imm(u64::from_ne_bytes(imm))),
});
}
let stru = ty::Kind::Struct(self.build_struct(fields)).compress();
self.ci.vars.truncate(prev_len);
self.ct.vm.write_reg(1, stru.repr() as u64);
}
}
if let Some(lpc) = local_pc {
let offset = lpc + self.ci.snap.code + self.output.code.as_ptr() as usize;
self.ct.vm.pc = hbvm::mem::Address::new(offset as _);
}
}
fn find_or_declare(
&mut self,
pos: Pos,
file: FileId,
name: Result<Ident, &str>,
lit_name: &str,
) -> ty::Kind {
log::dbg!("find_or_declare: {lit_name}");
let f = self.files[file as usize].clone();
let Some((expr, ident)) = f.find_decl(name) else {
match name {
Ok(_) => self.report(pos, format_args!("undefined indentifier: {lit_name}")),
Err("main") => self.report(pos, format_args!("missing main function: {f}")),
Err(name) => unimplemented!("somehow we did not handle: {name:?}"),
}
};
if let Some(existing) = self.tys.syms.get(&SymKey { file, ident }) {
if let ty::Kind::Func(id) = existing.expand()
&& let func = &mut self.tys.funcs[id as usize]
&& let Err(idx) = task::unpack(func.offset)
{
func.offset = task::id(self.tasks.len());
let task = self.tasks[idx].take();
self.tasks.push(task);
}
return existing.expand();
}
let sym = match expr {
Expr::BinOp {
left: &Expr::Ident { .. },
op: TokenKind::Decl,
right: &Expr::Closure { pos, args, ret, .. },
} => {
let id = self.tys.funcs.len() as _;
let func = Func {
file,
offset: task::id(self.tasks.len()),
sig: 'b: {
let arg_base = self.tys.args.len();
for arg in args {
let sym = find_symbol(&self.files[file as usize].symbols, arg.id);
if sym.flags & idfl::COMPTIME != 0 {
self.tys.args.truncate(arg_base);
break 'b None;
}
let ty = self.ty(&arg.ty);
self.tys.args.push(ty);
}
self.tasks.push(Some(FTask { file, id }));
let args = self.pack_args(pos, arg_base);
let ret = self.ty(ret);
Some(Sig { args, ret })
},
expr: ExprRef::new(expr),
};
self.tys.funcs.push(func);
ty::Kind::Func(id)
}
Expr::BinOp {
left: &Expr::Ident { .. },
op: TokenKind::Decl,
right: Expr::Struct { fields, .. },
} => ty::Kind::Struct(self.build_struct(fields)),
Expr::BinOp { left, op: TokenKind::Decl, right } => {
let gid = self.tys.globals.len() as ty::Global;
self.tys.globals.push(Global { offset: u32::MAX, ty: Default::default() });
let ci = ItemCtx {
file,
id: ty::Kind::Global(gid),
..self.pool.cis.pop().unwrap_or_default()
};
_ = left.find_pattern_path(ident, right, |expr| {
self.tys.globals[gid as usize] =
self.ct_eval(ci, |s, _| Ok::<_, !>(s.generate_global(expr))).into_ok();
});
ty::Kind::Global(gid)
}
e => unimplemented!("{e:#?}"),
};
self.tys.syms.insert(SymKey { ident, file }, sym.compress());
sym
}
fn generate_global(&mut self, expr: &Expr) -> Global {
self.output.emit_prelude();
let ret = self.ci.regs.allocate();
self.output.emit(instrs::cp(ret.get(), 1));
self.ci.task_base = self.tasks.len();
let ctx = Ctx::default().with_loc(Loc::reg(ret).into_derefed());
let Some(ret) = self.expr_ctx(expr, ctx) else {
self.report(expr.pos(), "expression is not reachable");
};
let stash = self.complete_call_graph();
let offset = self.ci.snap.code;
self.ci.snap.code += self.tys.size_of(ret.ty) as usize;
self.output.code.resize(self.ci.snap.code, 0);
self.push_stash(stash);
self.ci.finalize(&mut self.output);
self.output.emit(tx());
let ret_loc = unsafe { self.output.code.as_mut_ptr().add(offset) };
self.ct.vm.write_reg(1, ret_loc as u64);
Global { ty: ret.ty, offset: offset as _ }
}
fn dunp_imported_fns(&mut self) {
for &(f, _) in &self.output.funcs[self.ci.snap.funcs..] {
let fnball = self.tys.funcs[f as usize];
let file = self.files[fnball.file as usize].clone();
let expr = fnball.expr.get(&file).unwrap();
log::dbg!("{expr}");
}
}
fn pop_stash(&mut self) -> Output {
let mut stash = self.pool.outputs.pop().unwrap_or_default();
self.output.pop(&mut stash, &self.ci.snap);
stash
}
fn push_stash(&mut self, mut stash: Output) {
self.output.append(&mut stash);
self.pool.outputs.push(stash);
}
fn ct_eval<T, E>(
&mut self,
ci: ItemCtx,
compile: impl FnOnce(&mut Self, &mut ItemCtx) -> Result<T, E>,
) -> Result<T, E> {
log::dbg!("eval");
let stash = self.pop_stash();
let mut prev_ci = std::mem::replace(&mut self.ci, ci);
self.ci.snap = self.output.snap();
debug_assert_eq!(self.ci.snap, prev_ci.snap);
self.ci.task_base = self.tasks.len();
self.ci.regs.init();
let ret = compile(self, &mut prev_ci);
if ret.is_ok() {
self.link();
self.output.trunc(&Snapshot { code: self.output.code.len(), ..self.ci.snap });
log::dbg!("{} {}", self.output.code.len(), self.ci.snap.code);
let entry = &mut self.output.code[self.ci.snap.code] as *mut _ as _;
let prev_pc = std::mem::replace(&mut self.ct.vm.pc, hbvm::mem::Address::new(entry));
loop {
match self.ct.vm.run().unwrap() {
hbvm::VmRunOk::End => break,
hbvm::VmRunOk::Timer => unreachable!(),
hbvm::VmRunOk::Ecall => self.handle_ecall(),
hbvm::VmRunOk::Breakpoint => unreachable!(),
}
}
self.ct.vm.pc = prev_pc;
}
self.output.trunc(&self.ci.snap);
self.pool.cis.push(std::mem::replace(&mut self.ci, prev_ci));
self.ci.snap = self.output.snap();
debug_assert_eq!(self.pool.cis.last().unwrap().snap, self.ci.snap);
self.push_stash(stash);
log::dbg!("eval-end");
ret
}
fn ty_display(&self, ty: ty::Id) -> ty::Display {
ty::Display::new(&self.tys, &self.files, ty)
}
#[must_use]
fn assert_ty(&self, pos: Pos, ty: ty::Id, expected: ty::Id) -> ty::Id {
if let Some(res) = ty.try_upcast(expected) {
res
} else {
let ty = self.ty_display(ty);
let expected = self.ty_display(expected);
self.report(pos, format_args!("expected {expected}, got {ty}"));
}
}
fn report(&self, pos: Pos, msg: impl std::fmt::Display) -> ! {
let (line, col) = self.cfile().nlines.line_col(pos);
println!("{}:{}:{}: {}", self.cfile().path, line, col, msg);
unreachable!();
}
fn cfile(&self) -> &parser::Ast {
&self.files[self.ci.file as usize]
}
fn local_code(&mut self) -> &mut [u8] {
&mut self.output.code[self.ci.snap.code..]
}
fn local_offset(&self) -> u32 {
(self.output.code.len() - self.ci.snap.code) as u32
}
fn local_snap(&self) -> Snapshot {
Snapshot {
code: self.output.code.len() - self.ci.snap.code,
string_data: self.output.string_data.len() - self.ci.snap.string_data,
funcs: self.output.funcs.len() - self.ci.snap.funcs,
globals: self.output.globals.len() - self.ci.snap.globals,
strings: self.output.strings.len() - self.ci.snap.strings,
}
}
fn pop_local_snap(&mut self, snap: Snapshot) {
self.output.code.truncate(snap.code + self.ci.snap.code);
self.output.string_data.truncate(snap.string_data + self.ci.snap.string_data);
self.output.funcs.truncate(snap.funcs + self.ci.snap.funcs);
self.output.globals.truncate(snap.globals + self.ci.snap.globals);
self.output.strings.truncate(snap.strings + self.ci.snap.strings);
}
fn pack_args(&mut self, pos: Pos, arg_base: usize) -> ty::Tuple {
let needle = &self.tys.args[arg_base..];
if needle.is_empty() {
return ty::Tuple::empty();
}
let len = needle.len();
// FIXME: maybe later when this becomes a bottleneck we use more
// efficient search (SIMD?, indexing?)
let sp = self.tys.args.windows(needle.len()).position(|val| val == needle).unwrap();
self.tys.args.truncate((sp + needle.len()).max(arg_base));
ty::Tuple::new(sp, len)
.unwrap_or_else(|| self.report(pos, "amount of arguments not supported"))
}
}
#[cfg(test)]
mod tests {
use {
super::parser,
crate::{codegen::LoggedMem, log},
};
const README: &str = include_str!("../README.md");
fn generate(ident: &'static str, input: &'static str, output: &mut String) {
fn find_block(mut input: &'static str, test_name: &'static str) -> &'static str {
const CASE_PREFIX: &str = "#### ";
const CASE_SUFFIX: &str = "\n```hb";
loop {
let Some(pos) = input.find(CASE_PREFIX) else {
unreachable!("test {test_name} not found");
};
input = unsafe { input.get_unchecked(pos + CASE_PREFIX.len()..) };
if !input.starts_with(test_name) {
continue;
}
input = unsafe { input.get_unchecked(test_name.len()..) };
if !input.starts_with(CASE_SUFFIX) {
continue;
}
input = unsafe { input.get_unchecked(CASE_SUFFIX.len()..) };
let end = input.find("```").unwrap_or(input.len());
break unsafe { input.get_unchecked(..end) };
}
}
let input = find_block(input, ident);
let path = "test";
let mut codegen = super::Codegen {
files: vec![parser::Ast::new(path, input, &parser::no_loader)],
..Default::default()
};
codegen.generate();
let mut out = Vec::new();
codegen.dump(&mut out).unwrap();
log::dbg!("code: {}", String::from_utf8_lossy(&out));
use std::fmt::Write;
let mut stack = [0_u64; 128];
let mut vm = unsafe {
hbvm::Vm::<_, 0>::new(
LoggedMem::default(),
hbvm::mem::Address::new(out.as_ptr() as u64),
)
};
vm.write_reg(super::STACK_PTR, unsafe { stack.as_mut_ptr().add(stack.len()) } as u64);
let stat = loop {
match vm.run() {
Ok(hbvm::VmRunOk::End) => break Ok(()),
Ok(hbvm::VmRunOk::Ecall) => match vm.read_reg(2).0 {
1 => writeln!(output, "ev: Ecall").unwrap(), // compatibility with a test
69 => {
let [size, align] = [vm.read_reg(3).0 as usize, vm.read_reg(4).0 as usize];
let layout = std::alloc::Layout::from_size_align(size, align).unwrap();
let ptr = unsafe { std::alloc::alloc(layout) };
vm.write_reg(1, ptr as u64);
}
96 => {
let [ptr, size, align] = [
vm.read_reg(3).0 as usize,
vm.read_reg(4).0 as usize,
vm.read_reg(5).0 as usize,
];
let layout = std::alloc::Layout::from_size_align(size, align).unwrap();
unsafe { std::alloc::dealloc(ptr as *mut u8, layout) };
}
unknown => unreachable!("unknown ecall: {unknown:?}"),
},
Ok(ev) => writeln!(output, "ev: {:?}", ev).unwrap(),
Err(e) => break Err(e),
}
};
writeln!(output, "code size: {}", out.len()).unwrap();
writeln!(output, "ret: {:?}", vm.read_reg(1).0).unwrap();
writeln!(output, "status: {:?}", stat).unwrap();
log::inf!("input lenght: {}", input.len());
}
crate::run_tests! { generate:
arithmetic => README;
variables => README;
functions => README;
comments => README;
if_statements => README;
loops => README;
fb_driver => README;
pointers => README;
structs => README;
different_types => README;
struct_operators => README;
directives => README;
global_variables => README;
generic_types => README;
generic_functions => README;
c_strings => README;
}
}
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