forked from AbleOS/holey-bytes
adding destination semantics for expressions
This commit is contained in:
parent
2226a47aaa
commit
b28baa86f7
|
@ -29,6 +29,37 @@ impl Drop for LinReg {
|
|||
}
|
||||
}
|
||||
|
||||
enum CowReg {
|
||||
Lin(LinReg),
|
||||
Reg(Reg),
|
||||
}
|
||||
|
||||
impl CowReg {
|
||||
fn get(&self) -> Reg {
|
||||
match *self {
|
||||
Self::Lin(LinReg(reg)) => reg,
|
||||
Self::Reg(reg) => reg,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Default)]
|
||||
enum Ctx {
|
||||
#[default]
|
||||
None,
|
||||
Inferred(Type),
|
||||
Dest(Value),
|
||||
}
|
||||
impl Ctx {
|
||||
fn ty(&self) -> Option<Type> {
|
||||
Some(match self {
|
||||
Self::Inferred(ty) => *ty,
|
||||
Self::Dest(Value { ty, .. }) => *ty,
|
||||
_ => return None,
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
pub mod bt {
|
||||
use super::*;
|
||||
|
||||
|
@ -229,6 +260,13 @@ impl RegAlloc {
|
|||
std::mem::forget(reg);
|
||||
}
|
||||
|
||||
fn free_cow(&mut self, reg: CowReg) {
|
||||
match reg {
|
||||
CowReg::Lin(reg) => self.free(reg),
|
||||
CowReg::Reg(_) => {}
|
||||
}
|
||||
}
|
||||
|
||||
fn pushed_size(&self) -> usize {
|
||||
(self.max_used as usize - RET_ADDR as usize + 1) * 8
|
||||
}
|
||||
|
@ -401,7 +439,7 @@ impl<'a> Codegen<'a> {
|
|||
self.ret = fn_label.ret;
|
||||
|
||||
log::dbg!("fn-body");
|
||||
if self.expr(body, None).is_some() {
|
||||
if self.expr(body).is_some() {
|
||||
self.report(body.pos(), "expected all paths in the fucntion to return");
|
||||
}
|
||||
self.vars.clear();
|
||||
|
@ -490,6 +528,7 @@ impl<'a> Codegen<'a> {
|
|||
self.code.encode(instrs::cp(reg.0, rr));
|
||||
reg
|
||||
}
|
||||
Loc::Return => todo!(),
|
||||
Loc::Reg(reg) => reg,
|
||||
Loc::Deref(dreg, offset) => {
|
||||
let reg = self.gpa.allocate();
|
||||
|
@ -563,55 +602,35 @@ impl<'a> Codegen<'a> {
|
|||
}
|
||||
}
|
||||
|
||||
fn expr(&mut self, expr: &'a parser::Expr<'a>, expeted: Option<Type>) -> Option<Value> {
|
||||
match *expr {
|
||||
fn expr(&mut self, expr: &'a parser::Expr<'a>) -> Option<Value> {
|
||||
self.expr_ctx(expr, Ctx::default())
|
||||
}
|
||||
|
||||
fn expr_ctx(&mut self, expr: &'a parser::Expr<'a>, ctx: Ctx) -> Option<Value> {
|
||||
let value = match *expr {
|
||||
E::Bool { value, .. } => Some(Value {
|
||||
ty: bt::BOOL,
|
||||
loc: Loc::Imm(value as u64),
|
||||
}),
|
||||
E::Ctor { ty, fields } => {
|
||||
let ty = self.ty(&ty);
|
||||
let TypeKind::Struct(idx) = TypeKind::from_ty(ty) else {
|
||||
self.report(
|
||||
expr.pos(),
|
||||
format_args!("expected struct, got {}", self.display_ty(ty)),
|
||||
);
|
||||
let size = self.size_of(ty);
|
||||
|
||||
let loc = match ctx {
|
||||
Ctx::Dest(dest) => dest.loc,
|
||||
_ => Loc::Stack(self.alloc_stack(size as u32)),
|
||||
};
|
||||
|
||||
let mut field_values = fields
|
||||
.iter()
|
||||
.map(|(name, field)| self.expr(field, None).map(|v| (*name, v)))
|
||||
.collect::<Option<Vec<_>>>()?;
|
||||
|
||||
let size = self.size_of(ty);
|
||||
let stack = self.alloc_stack(size as u32);
|
||||
|
||||
let decl_fields = self.records[idx as usize].fields.clone();
|
||||
let mut offset = 0;
|
||||
for &(ref name, ty) in decl_fields.as_ref() {
|
||||
let index = field_values
|
||||
.iter()
|
||||
.position(|(n, _)| *n == name.as_ref())
|
||||
.unwrap();
|
||||
let (_, value) = field_values.remove(index);
|
||||
self.assert_ty(expr.pos(), ty, value.ty);
|
||||
log::dbg!("ctor: {} {} {:?}", stack, offset, value.loc);
|
||||
self.assign(
|
||||
Value {
|
||||
ty: value.ty,
|
||||
loc: Loc::Stack(stack + offset),
|
||||
},
|
||||
value,
|
||||
);
|
||||
offset += self.size_of(ty);
|
||||
for (name, field) in fields {
|
||||
let (offset, ty) = self.offset_of(expr.pos(), ty, name);
|
||||
let loc = loc.offset_ref(offset);
|
||||
self.expr_ctx(field, Ctx::Dest(Value { ty, loc }))?;
|
||||
}
|
||||
Some(Value {
|
||||
ty,
|
||||
loc: Loc::Stack(stack),
|
||||
})
|
||||
|
||||
return Some(Value { ty, loc });
|
||||
}
|
||||
E::Field { target, field } => {
|
||||
let mut tal = self.expr(target, None)?;
|
||||
let mut tal = self.expr(target)?;
|
||||
if let TypeKind::Pointer(ty) = TypeKind::from_ty(tal.ty) {
|
||||
tal.ty = self.pointers[ty as usize];
|
||||
tal.loc = match tal.loc {
|
||||
|
@ -640,28 +659,38 @@ impl<'a> Codegen<'a> {
|
|||
val,
|
||||
pos,
|
||||
} => {
|
||||
let val = self.expr(val, None)?;
|
||||
match val.loc {
|
||||
let val = self.expr(val)?;
|
||||
let loc = match val.loc {
|
||||
Loc::StackRef(off) => {
|
||||
let reg = self.gpa.allocate();
|
||||
self.code.encode(instrs::addi64(reg.0, STACK_PTR, off));
|
||||
Some(Value {
|
||||
ty: self.alloc_pointer(val.ty),
|
||||
loc: Loc::Reg(reg),
|
||||
})
|
||||
Loc::Reg(reg)
|
||||
}
|
||||
Loc::Deref(r, off) => {
|
||||
self.code.encode(instrs::addi64(r.0, r.0, off));
|
||||
Loc::Reg(r)
|
||||
}
|
||||
Loc::DerefRef(r, off) => {
|
||||
let reg = self.gpa.allocate();
|
||||
self.code.encode(instrs::addi64(reg.0, r, off));
|
||||
Loc::Reg(reg)
|
||||
}
|
||||
l => self.report(
|
||||
pos,
|
||||
format_args!("cant take pointer of {} ({:?})", self.display_ty(val.ty), l),
|
||||
),
|
||||
}
|
||||
};
|
||||
Some(Value {
|
||||
ty: self.alloc_pointer(val.ty),
|
||||
loc,
|
||||
})
|
||||
}
|
||||
E::UnOp {
|
||||
op: T::Star,
|
||||
val,
|
||||
pos,
|
||||
} => {
|
||||
let val = self.expr(val, None)?;
|
||||
let val = self.expr(val)?;
|
||||
let reg = self.loc_to_reg(val.loc);
|
||||
match TypeKind::from_ty(val.ty) {
|
||||
TypeKind::Pointer(ty) => Some(Value {
|
||||
|
@ -679,7 +708,7 @@ impl<'a> Codegen<'a> {
|
|||
op: T::Decl,
|
||||
right,
|
||||
} => {
|
||||
let val = self.expr(right, None)?;
|
||||
let val = self.expr(right)?;
|
||||
let loc = self.make_loc_owned(val.loc, val.ty);
|
||||
let loc = self.ensure_spilled(loc);
|
||||
self.vars.push(Variable {
|
||||
|
@ -696,7 +725,7 @@ impl<'a> Codegen<'a> {
|
|||
let fn_label = self.labels[func as usize].clone();
|
||||
let mut parama = 3..12;
|
||||
for (earg, &ty) in args.iter().zip(fn_label.args.iter()) {
|
||||
let arg = self.expr(earg, Some(ty))?;
|
||||
let arg = self.expr_ctx(earg, Ctx::Inferred(ty))?;
|
||||
self.assert_ty(earg.pos(), ty, arg.ty);
|
||||
self.pass_arg(arg, &mut parama);
|
||||
}
|
||||
|
@ -705,18 +734,19 @@ impl<'a> Codegen<'a> {
|
|||
let loc = match size {
|
||||
0 => Loc::Imm(0),
|
||||
8 => Loc::RegRef(1),
|
||||
16 => {
|
||||
let stack = self.alloc_stack(16);
|
||||
Loc::Stack(stack)
|
||||
}
|
||||
16 => match ctx {
|
||||
Ctx::Dest(dest) => dest.loc,
|
||||
_ => Loc::Stack(self.alloc_stack(size as u32)),
|
||||
},
|
||||
24..=u64::MAX => {
|
||||
let stack = self.alloc_stack(size as u32);
|
||||
let reg = self.gpa.allocate();
|
||||
self.code
|
||||
.encode(instrs::addi64(reg.0, STACK_PTR, stack as u64));
|
||||
self.code.encode(instrs::cp(1, reg.0));
|
||||
self.gpa.free(reg);
|
||||
Loc::Stack(stack)
|
||||
let val = match ctx {
|
||||
Ctx::Dest(dest) => dest.loc,
|
||||
_ => Loc::Stack(self.alloc_stack(size as u32)),
|
||||
};
|
||||
let (ptr, off) = val.ref_to_ptr(size);
|
||||
self.code.encode(instrs::cp(1, ptr));
|
||||
self.code.encode(instrs::addi64(1, ptr, off));
|
||||
val
|
||||
}
|
||||
s => todo!("call return size: {}", s),
|
||||
};
|
||||
|
@ -735,10 +765,10 @@ impl<'a> Codegen<'a> {
|
|||
s => todo!("call return size: {}", s),
|
||||
}
|
||||
|
||||
Some(Value {
|
||||
return Some(Value {
|
||||
ty: fn_label.ret,
|
||||
loc,
|
||||
})
|
||||
});
|
||||
}
|
||||
E::Ident { name, id, .. } => {
|
||||
let Some(var) = self.vars.iter().find(|v| v.id == id) else {
|
||||
|
@ -751,29 +781,9 @@ impl<'a> Codegen<'a> {
|
|||
}
|
||||
E::Return { val, pos } => {
|
||||
if let Some(val) = val {
|
||||
let val = self.expr(val, Some(self.ret))?;
|
||||
let val = self.expr_ctx(val, Ctx::Inferred(self.ret))?;
|
||||
self.assert_ty(pos, self.ret, val.ty);
|
||||
let size = self.size_of(val.ty);
|
||||
match size {
|
||||
8 => {
|
||||
let val = self.loc_to_reg(val.loc);
|
||||
self.code.encode(instrs::cp(1, val.0));
|
||||
self.gpa.free(val);
|
||||
}
|
||||
16 => {
|
||||
let (ptr, off) = self.loc_to_ptr(val.loc);
|
||||
self.code.encode(instrs::ld(1, ptr.0, off, 16));
|
||||
self.gpa.free(ptr);
|
||||
}
|
||||
24..=u64::MAX => {
|
||||
let (ptr, off) = self.loc_to_ptr(val.loc);
|
||||
self.code.encode(instrs::addi64(ptr.0, ptr.0, off));
|
||||
self.code
|
||||
.encode(instrs::bmc(ptr.0, 1, size.try_into().unwrap()));
|
||||
self.gpa.free(ptr);
|
||||
}
|
||||
s => todo!("return size: {}", s),
|
||||
};
|
||||
self.assign(self.ret, Loc::Return, val.loc);
|
||||
}
|
||||
self.ret_relocs.push(RetReloc {
|
||||
offset: self.code.code.len() as u32,
|
||||
|
@ -785,28 +795,28 @@ impl<'a> Codegen<'a> {
|
|||
}
|
||||
E::Block { stmts, .. } => {
|
||||
for stmt in stmts {
|
||||
if let Loc::Reg(reg) = self.expr(stmt, None)?.loc {
|
||||
if let Loc::Reg(reg) = self.expr(stmt)?.loc {
|
||||
self.gpa.free(reg);
|
||||
}
|
||||
}
|
||||
Some(Value::VOID)
|
||||
}
|
||||
E::Number { value, .. } => Some(Value {
|
||||
ty: expeted.unwrap_or(bt::INT),
|
||||
ty: ctx.ty().unwrap_or(bt::INT),
|
||||
loc: Loc::Imm(value),
|
||||
}),
|
||||
E::If {
|
||||
cond, then, else_, ..
|
||||
} => 'b: {
|
||||
log::dbg!("if-cond");
|
||||
let cond = self.expr(cond, Some(bt::BOOL))?;
|
||||
let cond = self.expr_ctx(cond, Ctx::Inferred(bt::BOOL))?;
|
||||
let reg = self.loc_to_reg(cond.loc);
|
||||
let jump_offset = self.code.code.len() as u32;
|
||||
self.code.encode(instrs::jeq(reg.0, 0, 0));
|
||||
self.gpa.free(reg);
|
||||
|
||||
log::dbg!("if-then");
|
||||
let then_unreachable = self.expr(then, None).is_none();
|
||||
let then_unreachable = self.expr(then).is_none();
|
||||
let mut else_unreachable = false;
|
||||
|
||||
let mut jump = self.code.code.len() as i16 - jump_offset as i16;
|
||||
|
@ -819,7 +829,7 @@ impl<'a> Codegen<'a> {
|
|||
jump = self.code.code.len() as i16 - jump_offset as i16;
|
||||
}
|
||||
|
||||
else_unreachable = self.expr(else_, None).is_none();
|
||||
else_unreachable = self.expr(else_).is_none();
|
||||
|
||||
if !then_unreachable {
|
||||
let jump = self.code.code.len() as i32 - else_jump_offset as i32;
|
||||
|
@ -846,7 +856,7 @@ impl<'a> Codegen<'a> {
|
|||
offset: loop_start,
|
||||
relocs: Default::default(),
|
||||
});
|
||||
let body_unreachable = self.expr(body, None).is_none();
|
||||
let body_unreachable = self.expr(body).is_none();
|
||||
|
||||
log::dbg!("loop-end");
|
||||
if !body_unreachable {
|
||||
|
@ -894,14 +904,14 @@ impl<'a> Codegen<'a> {
|
|||
}
|
||||
E::BinOp { left, op, right } => {
|
||||
if op == T::Assign {
|
||||
let left = self.expr(left, expeted)?;
|
||||
let right = self.expr(right, Some(left.ty))?;
|
||||
return self.assign(left, right);
|
||||
let left = self.expr(left)?;
|
||||
let right = self.expr_ctx(right, Ctx::Inferred(left.ty))?;
|
||||
return self.assign(left.ty, left.loc, right.loc);
|
||||
}
|
||||
|
||||
let left = self.expr(left, expeted)?;
|
||||
let left = self.expr(left)?;
|
||||
let lhs = self.loc_to_reg(left.loc);
|
||||
let right = self.expr(right, Some(left.ty))?;
|
||||
let right = self.expr_ctx(right, Ctx::Inferred(left.ty))?;
|
||||
let rhs = self.loc_to_reg(right.loc);
|
||||
|
||||
let op = match op {
|
||||
|
@ -940,16 +950,23 @@ impl<'a> Codegen<'a> {
|
|||
})
|
||||
}
|
||||
ast => unimplemented!("{:#?}", ast),
|
||||
}?;
|
||||
|
||||
if let Ctx::Dest(dest) = ctx {
|
||||
self.assign(dest.ty, dest.loc, value.loc);
|
||||
Some(Value::VOID)
|
||||
} else {
|
||||
Some(value)
|
||||
}
|
||||
}
|
||||
|
||||
fn assign(&mut self, right: Value, left: Value) -> Option<Value> {
|
||||
let size = self.size_of(left.ty);
|
||||
fn assign(&mut self, ty: Type, right: Loc, left: Loc) -> Option<Value> {
|
||||
let size = self.size_of(ty);
|
||||
|
||||
match size {
|
||||
8 => {
|
||||
let lhs = self.loc_to_reg(left.loc);
|
||||
match right.loc {
|
||||
let lhs = self.loc_to_reg(left);
|
||||
match right {
|
||||
Loc::Deref(reg, off) => {
|
||||
self.code.encode(instrs::st(lhs.0, reg.0, off, 8));
|
||||
self.gpa.free(reg);
|
||||
|
@ -958,13 +975,20 @@ impl<'a> Codegen<'a> {
|
|||
Loc::StackRef(offset) | Loc::Stack(offset) => {
|
||||
self.store_stack(lhs.0, offset, 8)
|
||||
}
|
||||
Loc::Return => self.code.encode(instrs::cp(1, lhs.0)),
|
||||
l => unimplemented!("{:?}", l),
|
||||
}
|
||||
self.gpa.free(lhs);
|
||||
}
|
||||
16 if matches!(right, Loc::Return) => {
|
||||
let (lhs, loff) = left.to_ptr(size);
|
||||
self.code.encode(instrs::st(1, lhs.get(), loff, 16));
|
||||
self.gpa.free_cow(lhs);
|
||||
}
|
||||
16..=u64::MAX => {
|
||||
let (rhs, roff) = self.loc_to_ptr(right.loc);
|
||||
let (lhs, loff) = self.loc_to_ptr(left.loc);
|
||||
let (rhs, roff) = right.to_ptr(size);
|
||||
let (lhs, loff) = left.to_ptr(size);
|
||||
let (rhs, lhs) = (self.to_owned(rhs), self.to_owned(lhs));
|
||||
|
||||
self.code.encode(instrs::addi64(rhs.0, rhs.0, roff));
|
||||
self.code.encode(instrs::addi64(lhs.0, lhs.0, loff));
|
||||
|
@ -980,20 +1004,14 @@ impl<'a> Codegen<'a> {
|
|||
Some(Value::VOID)
|
||||
}
|
||||
|
||||
fn loc_to_ptr(&mut self, loc: Loc) -> (LinReg, u64) {
|
||||
fn to_owned(&mut self, loc: CowReg) -> LinReg {
|
||||
match loc {
|
||||
Loc::Deref(reg, off) => (reg, off),
|
||||
Loc::DerefRef(reg, off) => {
|
||||
let dreg = self.gpa.allocate();
|
||||
self.code.encode(instrs::cp(dreg.0, reg));
|
||||
(dreg, off)
|
||||
CowReg::Lin(reg) => reg,
|
||||
CowReg::Reg(reg) => {
|
||||
let new = self.gpa.allocate();
|
||||
self.code.encode(instrs::cp(new.0, reg));
|
||||
new
|
||||
}
|
||||
Loc::Stack(offset) | Loc::StackRef(offset) => {
|
||||
let reg = self.gpa.allocate();
|
||||
self.code.encode(instrs::cp(reg.0, STACK_PTR));
|
||||
(reg, offset)
|
||||
}
|
||||
l => panic!("expected stack location, got {:?}", l),
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -1085,16 +1103,7 @@ impl<'a> Codegen<'a> {
|
|||
Loc::StackRef(off) => {
|
||||
let size = self.size_of(ty);
|
||||
let stack = self.alloc_stack(size as u32);
|
||||
self.assign(
|
||||
Value {
|
||||
ty,
|
||||
loc: Loc::Stack(stack),
|
||||
},
|
||||
Value {
|
||||
ty,
|
||||
loc: Loc::StackRef(off),
|
||||
},
|
||||
);
|
||||
self.assign(ty, Loc::Stack(stack), Loc::StackRef(off));
|
||||
Loc::Stack(stack)
|
||||
}
|
||||
l => l,
|
||||
|
@ -1121,6 +1130,7 @@ impl<'a> Codegen<'a> {
|
|||
Loc::RegRef(reg) => {
|
||||
self.code.encode(instrs::cp(p, reg));
|
||||
}
|
||||
Loc::Return => todo!(),
|
||||
Loc::Deref(reg, off) => {
|
||||
self.code.encode(instrs::ld(p, reg.0, off, size as _));
|
||||
self.gpa.free(reg);
|
||||
|
@ -1155,16 +1165,7 @@ impl<'a> Codegen<'a> {
|
|||
24..=u64::MAX => {
|
||||
let ptr = parama.next().unwrap();
|
||||
let stack = self.alloc_stack(size as u32);
|
||||
self.assign(
|
||||
Value {
|
||||
ty,
|
||||
loc: Loc::StackRef(stack),
|
||||
},
|
||||
Value {
|
||||
ty,
|
||||
loc: Loc::DerefRef(ptr, 0),
|
||||
},
|
||||
);
|
||||
self.assign(ty, Loc::StackRef(stack), Loc::DerefRef(ptr, 0));
|
||||
Loc::Stack(stack)
|
||||
}
|
||||
blah => todo!("{blah:?}"),
|
||||
|
@ -1214,6 +1215,7 @@ impl Value {
|
|||
enum Loc {
|
||||
Reg(LinReg),
|
||||
RegRef(Reg),
|
||||
Return,
|
||||
Deref(LinReg, u64),
|
||||
DerefRef(Reg, u64),
|
||||
Imm(u64),
|
||||
|
@ -1228,6 +1230,36 @@ impl Loc {
|
|||
un => unreachable!("{:?}", un),
|
||||
}
|
||||
}
|
||||
|
||||
fn to_ptr(self, size: u64) -> (CowReg, u64) {
|
||||
match self {
|
||||
Loc::Return if size > 16 => (CowReg::Reg(1), 0),
|
||||
Loc::Deref(reg, off) => (CowReg::Lin(reg), off),
|
||||
Loc::DerefRef(reg, off) => (CowReg::Reg(reg), off),
|
||||
Loc::Stack(offset) | Loc::StackRef(offset) => (CowReg::Reg(STACK_PTR), offset),
|
||||
l => panic!("expected stack location, got {:?}", l),
|
||||
}
|
||||
}
|
||||
|
||||
fn ref_to_ptr(&self, size: u64) -> (Reg, u64) {
|
||||
match *self {
|
||||
Loc::Return if size > 16 => (1, 0),
|
||||
Loc::Deref(LinReg(reg), off) => (reg, off),
|
||||
Loc::DerefRef(reg, off) => (reg, off),
|
||||
Loc::Stack(offset) | Loc::StackRef(offset) => (STACK_PTR, offset),
|
||||
ref l => panic!("expected stack location, got {:?}", l),
|
||||
}
|
||||
}
|
||||
|
||||
fn offset_ref(&self, offset: u64) -> Loc {
|
||||
match *self {
|
||||
Self::Deref(LinReg(r), off) => Self::DerefRef(r, off + offset),
|
||||
Self::DerefRef(r, off) => Self::DerefRef(r, off + offset),
|
||||
Self::Stack(off) => Self::Stack(off + offset),
|
||||
Self::StackRef(off) => Self::StackRef(off + offset),
|
||||
ref un => unreachable!("{:?}", un),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
|
|
|
@ -1,3 +1,3 @@
|
|||
code size: 691
|
||||
code size: 596
|
||||
ret: 3
|
||||
status: Ok(())
|
||||
|
|
Loading…
Reference in a new issue