e63d14419f
In preparation for both implementing the `functionArgs` builtin and adding support for validating closed formals, record information about the formal arguments to a function *on the Lambda itself*. This may seem a little odd for the purposes of just closed formal checking, but is something we have to have anyway for builtins.functionArgs so I figured I'd do it this way to kill both birds with one stone. Change-Id: Ie3770a607bf352a1eb395c79ca29bb25d5978cd8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7001 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
94 lines
2.4 KiB
Rust
94 lines
2.4 KiB
Rust
//! This module implements the runtime representation of functions.
|
|
use std::{
|
|
cell::{Ref, RefCell, RefMut},
|
|
collections::HashMap,
|
|
rc::Rc,
|
|
};
|
|
|
|
use crate::{
|
|
chunk::Chunk,
|
|
upvalues::{UpvalueCarrier, Upvalues},
|
|
};
|
|
|
|
use super::NixString;
|
|
|
|
#[derive(Clone, Debug, PartialEq)]
|
|
pub(crate) struct Formals {
|
|
/// Map from argument name, to whether that argument is required
|
|
pub(crate) arguments: HashMap<NixString, bool>,
|
|
|
|
/// Do the formals of this function accept extra arguments
|
|
pub(crate) ellipsis: bool,
|
|
}
|
|
|
|
/// The opcodes for a thunk or closure, plus the number of
|
|
/// non-executable opcodes which are allowed after an OpClosure or
|
|
/// OpThunk referencing it. At runtime `Lambda` is usually wrapped
|
|
/// in `Rc` to avoid copying the `Chunk` it holds (which can be
|
|
/// quite large).
|
|
#[derive(Debug, PartialEq)]
|
|
pub struct Lambda {
|
|
pub(crate) chunk: Chunk,
|
|
|
|
/// Number of upvalues which the code in this Lambda closes
|
|
/// over, and which need to be initialised at
|
|
/// runtime. Information about the variables is emitted using
|
|
/// data-carrying opcodes (see [`OpCode::DataLocalIdx`]).
|
|
pub(crate) upvalue_count: usize,
|
|
pub(crate) formals: Option<Formals>,
|
|
}
|
|
|
|
impl Lambda {
|
|
pub fn new_anonymous() -> Self {
|
|
Lambda {
|
|
chunk: Default::default(),
|
|
upvalue_count: 0,
|
|
formals: None,
|
|
}
|
|
}
|
|
|
|
pub fn chunk(&mut self) -> &mut Chunk {
|
|
&mut self.chunk
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Debug, PartialEq)]
|
|
pub struct InnerClosure {
|
|
pub lambda: Rc<Lambda>,
|
|
upvalues: Upvalues,
|
|
}
|
|
|
|
#[repr(transparent)]
|
|
#[derive(Clone, Debug, PartialEq)]
|
|
pub struct Closure(Rc<RefCell<InnerClosure>>);
|
|
|
|
impl Closure {
|
|
pub fn new(lambda: Rc<Lambda>) -> Self {
|
|
Closure(Rc::new(RefCell::new(InnerClosure {
|
|
upvalues: Upvalues::with_capacity(lambda.upvalue_count),
|
|
lambda,
|
|
})))
|
|
}
|
|
|
|
pub fn chunk(&self) -> Ref<'_, Chunk> {
|
|
Ref::map(self.0.borrow(), |c| &c.lambda.chunk)
|
|
}
|
|
|
|
pub fn lambda(&self) -> Rc<Lambda> {
|
|
self.0.borrow().lambda.clone()
|
|
}
|
|
}
|
|
|
|
impl UpvalueCarrier for Closure {
|
|
fn upvalue_count(&self) -> usize {
|
|
self.0.borrow().lambda.upvalue_count
|
|
}
|
|
|
|
fn upvalues(&self) -> Ref<'_, Upvalues> {
|
|
Ref::map(self.0.borrow(), |c| &c.upvalues)
|
|
}
|
|
|
|
fn upvalues_mut(&self) -> RefMut<'_, Upvalues> {
|
|
RefMut::map(self.0.borrow_mut(), |c| &mut c.upvalues)
|
|
}
|
|
}
|