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This commit is contained in:
mlokr 2024-02-04 18:32:55 +01:00
parent 8a3dd3001d
commit 975ce8a9fe
2 changed files with 102 additions and 24 deletions
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118
hblang/src/codegen.rs
View file

@ -1,7 +1,7 @@
use std::{iter::Cycle, ops::Range};
use std::{iter::Cycle, mem::offset_of, ops::Range};
use crate::{
lexer::Ty,
lexer::{self, Ty},
parser::{Exp, Function, Item, Literal, Struct, Type},
};
@ -16,14 +16,16 @@ use crate::{
//| r254 | Stack pointer | Callee |
//| r255 | Thread pointer | N/A |
const STACK_POINTER: Reg = 254;
struct RegAlloc {
pub regs: Box<[Option<usize>; 256]>,
pub used: Box<[bool; 256]>,
pub spill_cycle: Cycle<Range<usize>>,
pub spill_cycle: Cycle<Range<u8>>,
}
impl RegAlloc {
fn alloc_regurn(&mut self, slot: SlotId) -> Option<Reg> {
fn alloc_return(&mut self, slot: SlotId) -> Option<Reg> {
self.regs[1..2]
.iter_mut()
.position(|reg| {
@ -57,15 +59,27 @@ impl RegAlloc {
assert!(self.regs[reg as usize].take().is_some());
}
fn spill(&mut self, for_slot: SlotId) -> (Reg, SlotId) {
fn is_used(&self, reg: Reg) -> bool {
self.regs[reg as usize].is_some()
}
fn spill(&mut self, for_slot: SlotId) -> (Reg, Option<SlotId>) {
let to_spill = self.spill_cycle.next().unwrap();
let slot = self.regs[to_spill].replace(for_slot).unwrap();
let slot = self.spill_specific(to_spill, for_slot);
(to_spill as Reg + 32, slot)
}
fn spill_specific(&mut self, reg: Reg, for_slot: SlotId) -> Option<SlotId> {
self.regs[reg as usize].replace(for_slot)
}
fn restore(&mut self, reg: Reg, slot: SlotId) -> SlotId {
self.regs[reg as usize].replace(slot).unwrap()
}
fn alloc_specific(&mut self, reg: u8, to: usize) {
assert!(self.regs[reg as usize].replace(to).is_none());
}
}
pub struct ParamAlloc {
@ -81,7 +95,7 @@ impl ParamAlloc {
}
}
fn alloc(&mut self, mut size: usize) -> Value {
fn alloc(&mut self, size: usize) -> Value {
match self.try_alloc_regs(size) {
Some(reg) => reg,
None => panic!("Too many arguments o7"),
@ -102,12 +116,12 @@ impl ParamAlloc {
1 => {
let reg = self.reg_range.start;
self.reg_range.start += 1;
Some(Value::Reg(reg, None))
Some(Value::Reg(reg, None, 0))
}
2 => {
let reg = self.reg_range.start;
self.reg_range.start += 2;
Some(Value::Reg(reg, Some(reg + 1)))
Some(Value::Reg(reg, Some(reg + 1), 0))
}
_ => unreachable!(),
}
@ -159,15 +173,38 @@ impl hbbytecode::Buffer for InstBuffer {
type Reg = u8;
type Offset = i32;
type Pushed = bool;
#[derive(Clone, Copy)]
enum Value {
Reg(Reg, Option<Reg>),
Stack(Offset),
Reg(Reg, Option<Reg>, Offset),
Stack(Offset, Pushed),
Imm(u64),
Spilled(Reg, SlotId, Option<Reg>, Option<SlotId>),
Spilled(Reg, SlotId, Option<Reg>, Option<SlotId>, Offset),
DoubleSpilled(SlotId, Offset, Option<SlotId>),
}
#[derive(Clone, Copy)]
enum NormalizedValue {
Reg(Reg, Option<Reg>, Offset),
Stack(Offset, Pushed),
Imm(u64),
}
impl From<Value> for NormalizedValue {
fn from(value: Value) -> Self {
match value {
Value::Reg(reg, secondary, offset) => NormalizedValue::Reg(reg, secondary, offset),
Value::Stack(offset, pushed) => NormalizedValue::Stack(offset, pushed),
Value::Imm(imm) => NormalizedValue::Imm(imm),
Value::Spilled(reg, _, secondary, _, offset) => {
NormalizedValue::Reg(reg, secondary, offset)
}
Value::DoubleSpilled(_, offset, _) => NormalizedValue::Stack(offset, false),
}
}
}
type Label = usize;
type Data = usize;
@ -187,6 +224,13 @@ pub struct Frame {
pub var_count: usize,
}
enum Instr {
BinOp(lexer::Op, NormalizedValue, NormalizedValue),
Move(usize, NormalizedValue, NormalizedValue),
Jump(Label),
JumpIfZero(NormalizedValue, Label),
}
#[derive(Default)]
pub struct Generator<'a> {
ast: &'a [Item],
@ -208,6 +252,8 @@ pub struct Generator<'a> {
code_section: Vec<u8>,
data_section: Vec<u8>,
instrs: Vec<Instr>,
}
impl<'a> Generator<'a> {
@ -227,7 +273,9 @@ impl<'a> Generator<'a> {
for param in f.args.iter() {
let param_size = self.size_of(&param.ty);
let slot = self.add_slot(param.ty.clone(), param_alloc.alloc(param_size));
let value = param_alloc.alloc(param_size);
let slot = self.add_slot(param.ty.clone(), value);
self.allocate_value_regs(value, slot);
self.add_variable(param.name.clone(), slot);
}
@ -240,14 +288,23 @@ impl<'a> Generator<'a> {
self.pop_frame(frame);
}
fn allocate_value_regs(&mut self, value: Value, to: SlotId) {
if let Value::Reg(primary, secondary, _) = value {
self.regs.alloc_specific(primary, to);
if let Some(secondary) = secondary {
self.regs.alloc_specific(secondary, to);
}
}
}
fn generate_expr(&mut self, expected: Option<Type>, expr: &Exp) -> Option<SlotId> {
let value = match expr {
Exp::Literal(lit) => match lit {
Literal::Int(i) => self.add_slot(expected.unwrap(), Value::Imm(*i)),
Literal::Int(i) => self.add_slot(expected.clone().unwrap(), Value::Imm(*i)),
Literal::Bool(b) => self.add_slot(Type::Builtin(Ty::Bool), Value::Imm(*b as u64)),
},
Exp::Variable(ident) => self.lookup_variable(ident).unwrap().location,
Exp::Call { name, args } => self.generate_call(expected, name, args),
Exp::Call { name, args } => self.generate_call(expected.clone(), name, args),
Exp::Ctor { name, fields } => todo!(),
Exp::Index { base, index } => todo!(),
Exp::Field { base, field } => todo!(),
@ -292,10 +349,25 @@ impl<'a> Generator<'a> {
fn set_temporarly(&mut self, from: SlotId, to: Value) {
match to {
Value::Reg(f, s) => {}
Value::Reg(dst, secondary, offset) => {
let other_slot = secondary.and_then(|s| self.regs.spill_specific(s, usize::MAX));
if let Some(slot) = self.regs.spill_specific(dst, usize::MAX) {
self.slots[slot].value =
Value::Spilled(dst, slot, secondary, other_slot, offset);
} else if let Some(slot) = other_slot {
self.slots[slot].value =
Value::Spilled(secondary.unwrap(), slot, Some(dst), None, offset);
}
}
_ => unreachable!(),
};
todo!()
let size = self.size_of(&self.slots[from].ty);
self.emit_move(size, self.slots[from].value, to);
}
fn emit_move(&mut self, size: usize, from: Value, to: Value) {
self.instrs.push(Instr::Move(size, from.into(), to.into()));
}
fn size_of(&self, ty: &Type) -> usize {
@ -377,23 +449,23 @@ impl<'a> Generator<'a> {
fn lookup_struct(&self, name: &str) -> &Struct {
self.lookup_item(name)
.and_then(|item| match item {
Item::Struct(s) => Some(s),
.map(|item| match item {
Item::Struct(s) => s,
_ => panic!("Not a struct: {}", name),
})
.expect("Struct not found")
}
fn lookup_function(&self, name: &str) -> &Function {
fn lookup_function(&self, name: &str) -> &'a Function {
self.lookup_item(name)
.and_then(|item| match item {
Item::Function(f) => Some(f),
.map(|item| match item {
Item::Function(f) => f,
_ => panic!("Not a function: {}", name),
})
.expect("Function not found")
}
fn lookup_item(&self, name: &str) -> Option<&Item> {
fn lookup_item(&self, name: &str) -> Option<&'a Item> {
self.ast.iter().find(|item| match item {
Item::Import(_) => false,
Item::Struct(s) => s.name == name,

8
hblang/src/parser.rs
View file

@ -432,7 +432,13 @@ impl<'a> Parser<'a> {
Some(TokenKind::LParen) => {
self.next();
expr = Exp::Call {
name: Box::new(expr),
name: match expr {
Exp::Variable(name) => name,
_ => {
let (line, col) = self.pos_to_line_col(token.span.start);
panic!("Expected function name at {}:{}", line, col)
}
},
args: self.sequence(TokenKind::Comma, TokenKind::RParen, Self::parse_expr),
};
}