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feat: add support for *T pointers

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Jooris Hadeler
2026-04-22 23:14:53 +02:00
parent 8bcae8cb31
commit f3c93fa516
10 changed files with 282 additions and 33 deletions
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src/middle/builder.rs
+62 -18
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@@ -139,6 +139,7 @@ impl FuncBuilder {
ty,
mutable: false,
name: Some(name.clone()),
address_taken: false,
});
self.scopes.last_mut().unwrap().insert(name, id);
id
@@ -152,6 +153,7 @@ impl FuncBuilder {
ty,
mutable: false,
name: None,
address_taken: false,
});
id
}
@@ -364,15 +366,43 @@ impl FuncBuilder {
}
TypedExprKind::Boolean { value } => Operand::Constant(ConstantValue::Boolean(*value)),
TypedExprKind::Unary { op, expr: inner } => {
let inner_op = self.lower_expr(inner);
let temp = self.new_temp(expr.ty.clone());
self.emit_stmt(Statement {
kind: StatementKind::Assign(temp, Rvalue::UnaryOp(*op, inner_op)),
span: expr.span,
});
Operand::Copy(temp)
match op {
UnaryOp::AddressOf => match &inner.kind {
TypedExprKind::Identifier { name } => {
let id = self.lookup(name);
self.locals[id.0].address_taken = true;
let temp = self.new_temp(expr.ty.clone());
self.emit_stmt(Statement {
kind: StatementKind::Assign(temp, Rvalue::AddressOf(id)),
span: expr.span,
});
Operand::Copy(temp)
}
TypedExprKind::Unary {
op: UnaryOp::Deref,
expr: ptr_expr,
} => self.lower_expr(ptr_expr), // `&*ptr` is optimized right back to `ptr`!
_ => unreachable!("invalid lvalue for addressof"),
},
UnaryOp::Deref => {
let inner_op = self.lower_expr(inner);
let temp = self.new_temp(expr.ty.clone());
self.emit_stmt(Statement {
kind: StatementKind::Assign(temp, Rvalue::ReadPointer(inner_op)),
span: expr.span,
});
Operand::Copy(temp)
}
_ => {
let inner_op = self.lower_expr(inner);
let temp = self.new_temp(expr.ty.clone());
self.emit_stmt(Statement {
kind: StatementKind::Assign(temp, Rvalue::UnaryOp(*op, inner_op)),
span: expr.span,
});
Operand::Copy(temp)
}
}
}
TypedExprKind::Binary { op, lhs, rhs } => {
let lhs_op = self.lower_expr(lhs);
@@ -389,15 +419,29 @@ impl FuncBuilder {
TypedExprKind::Assign { lval, rval } => {
let rval_op = self.lower_expr(rval);
let local_id = match &lval.kind {
TypedExprKind::Identifier { name } => self.lookup(name),
_ => panic!("invalid lval in MIR lowering"),
};
self.emit_stmt(Statement {
kind: StatementKind::Assign(local_id, Rvalue::Use(rval_op.clone())),
span: expr.span,
});
match &lval.kind {
TypedExprKind::Identifier { name } => {
let local_id = self.lookup(name);
self.emit_stmt(Statement {
kind: StatementKind::Assign(local_id, Rvalue::Use(rval_op.clone())),
span: expr.span,
});
}
TypedExprKind::Unary {
op: UnaryOp::Deref,
expr: ptr_expr,
} => {
let ptr_op = self.lower_expr(ptr_expr);
self.emit_stmt(Statement {
kind: StatementKind::Store {
ptr: ptr_op,
val: Rvalue::Use(rval_op.clone()),
},
span: expr.span,
});
}
_ => unreachable!("invalid lval in MIR lowering"),
}
rval_op
}