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|
//! This module implements the runtime representation of functions.
use std::{
cell::{Ref, RefCell},
rc::Rc,
};
use crate::{chunk::Chunk, opcode::UpvalueIdx, Value};
#[derive(Clone, Debug)]
pub struct Lambda {
// name: Option<NixString>,
pub(crate) chunk: Chunk,
pub(crate) upvalue_count: usize,
}
impl Lambda {
pub fn new_anonymous() -> Self {
Lambda {
// name: None,
chunk: Default::default(),
upvalue_count: 0,
}
}
pub fn chunk(&mut self) -> &mut Chunk {
&mut self.chunk
}
}
#[derive(Clone, Debug)]
pub struct InnerClosure {
pub lambda: Rc<Lambda>,
pub upvalues: Vec<Value>,
}
#[repr(transparent)]
#[derive(Clone, Debug)]
pub struct Closure(Rc<RefCell<InnerClosure>>);
impl Closure {
pub fn new(lambda: Rc<Lambda>) -> Self {
Closure(Rc::new(RefCell::new(InnerClosure {
upvalues: Vec::with_capacity(lambda.upvalue_count),
lambda,
})))
}
pub fn chunk(&self) -> Ref<'_, Chunk> {
Ref::map(self.0.borrow(), |c| &c.lambda.chunk)
}
pub fn upvalue(&self, idx: UpvalueIdx) -> Ref<'_, Value> {
Ref::map(self.0.borrow(), |c| &c.upvalues[idx.0])
}
pub fn upvalue_count(&self) -> usize {
self.0.borrow().lambda.upvalue_count
}
pub fn push_upvalue(&self, value: Value) {
self.0.borrow_mut().upvalues.push(value)
}
}
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