331 lines
8.9 KiB
Rust
331 lines
8.9 KiB
Rust
use std::hash::Hash;
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use std::marker::PhantomData;
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use bumpalo::Bump;
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use bumpalo::collections::Vec;
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use fix_lang::{BUILTINS, BuiltinId, StringId};
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use ghost_cell::{GhostCell, GhostToken};
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use num_enum::TryFromPrimitive as _;
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use rnix::{TextRange, ast};
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use string_interner::DefaultStringInterner;
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pub mod downgrade;
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pub type HashMap<'ir, K, V> = hashbrown::HashMap<K, V, hashbrown::DefaultHashBuilder, &'ir Bump>;
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pub type GhostIrRef<'id, 'ir> = <GhostRef<'id, 'ir> as RefExt<'ir>>::IrRef;
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pub type GhostRoIrRef<'id, 'ir> = <GhostRoRef<'id, 'ir> as RefExt<'ir>>::IrRef;
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pub type RawIrRef<'ir> = <RawRef<'ir> as RefExt<'ir>>::IrRef;
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pub type GhostMaybeThunkRef<'id, 'ir> = <GhostRef<'id, 'ir> as RefExt<'ir>>::MaybeThunkRef;
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pub type GhostRoMaybeThunkRef<'id, 'ir> = <GhostRoRef<'id, 'ir> as RefExt<'ir>>::MaybeThunkRef;
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impl<'id, 'ir> Ir<'ir, GhostRoRef<'id, 'ir>> {
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/// Freeze a mutable IR reference into a read-only one, consuming the
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/// `GhostToken` to prevent any further mutation.
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pub fn freeze(this: GhostRoIrRef<'id, 'ir>, _: GhostToken<'id>) -> RawIrRef<'ir> {
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// SAFETY: The transmute is sound because:
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// - `GhostCell<'id, T>` is `#[repr(transparent)]` over `T`, so
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// `&'ir GhostCell<'id, T>` and `&'ir T` have identical layout.
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// - `Ir<'ir, R>` is `#[repr(C)]`, and for every field that depends on
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// `R`, instantiating `R = GhostRef<'id, 'ir>` vs `R = RawRef<'ir>`
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// produces types of identical layout:
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// - `R::IrRef` becomes `&'ir GhostCell<'id, Ir<...>>` vs `&'ir Ir<...>`
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// - `R::MaybeThunkRef` becomes `&'ir GhostCell<'id, MaybeThunk>`
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// vs `&'ir MaybeThunk`
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// - `R::Ref<Ir<'ir, R>>` (used in `ConcatStrings::parts`) reduces
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// to the same case as `R::IrRef`
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// - Therefore `IrRef<'id, 'ir>` and `RawIrRef<'ir>` are both
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// pointer-sized references with the same layout.
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//
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// Consuming the `GhostToken` guarantees no `borrow_mut` calls can
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// occur afterwards, so the shared `&Ir` references reachable from a
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// `RawIrRef<'ir>` can never alias with mutable references.
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unsafe { std::mem::transmute::<GhostRoIrRef<'id, 'ir>, RawIrRef<'ir>>(this) }
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}
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}
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#[repr(transparent)]
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pub struct GhostRoCell<'id, T: ?Sized>(GhostCell<'id, T>);
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impl<'id, T> From<GhostCell<'id, T>> for GhostRoCell<'id, T> {
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fn from(value: GhostCell<'id, T>) -> Self {
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Self(value)
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}
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}
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impl<'id, T: ?Sized> From<&GhostCell<'id, T>> for &GhostRoCell<'id, T> {
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fn from(value: &GhostCell<'id, T>) -> Self {
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// SAFETY: `GhostRoCell` is `#[repr(transparent)]` over `GhostCell`
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// TODO: document mutability
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unsafe { std::mem::transmute(value) }
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}
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}
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impl<'id, T: ?Sized> From<&T> for &GhostRoCell<'id, T> {
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fn from(value: &T) -> Self {
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// SAFETY: `GhostRoCell` is `#[repr(transparent)]` over `GhostCell`,
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// which is `#[repr(transparent)]` over `T`
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// TODO: document mutability
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unsafe { std::mem::transmute(value) }
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}
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}
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impl<'id, T: ?Sized> GhostRoCell<'id, T> {
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pub fn borrow<'a>(&'a self, token: &'a GhostToken<'id>) -> &'a T {
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self.0.borrow(token)
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}
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}
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#[repr(C)]
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#[derive(Debug, Clone, Copy)]
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pub enum MaybeThunk {
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Int(i64),
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Float(f64),
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Bool(bool),
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Null,
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Str(StringId),
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Path(StringId),
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Thunk(ThunkId),
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Arg { layer: u8 },
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Builtin(BuiltinId),
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BuiltinConst(StringId),
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Builtins,
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ReplBinding(StringId),
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ScopedImportBinding { slot_id: u32, sym: StringId },
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}
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pub trait Ref<'ir> {
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type Ref<T>
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where
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T: 'ir;
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}
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pub trait RefExt<'ir>: Ref<'ir> {
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type Ir;
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type IrRef;
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type MaybeThunkRef;
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}
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impl<'ir, T: Ref<'ir> + 'ir> RefExt<'ir> for T {
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type Ir = Ir<'ir, Self>;
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type IrRef = Self::Ref<Self::Ir>;
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type MaybeThunkRef = Self::Ref<MaybeThunk>;
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}
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pub struct GhostRef<'id, 'ir>(PhantomData<&'ir GhostCell<'id, ()>>);
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pub struct GhostRoRef<'id, 'ir>(PhantomData<&'ir GhostRoCell<'id, ()>>);
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pub struct RawRef<'ir>(PhantomData<&'ir ()>);
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impl<'id, 'ir> Ref<'ir> for GhostRef<'id, 'ir> {
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type Ref<T: 'ir> = &'ir GhostCell<'id, T>;
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}
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impl<'id, 'ir> Ref<'ir> for GhostRoRef<'id, 'ir> {
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type Ref<T: 'ir> = &'ir GhostRoCell<'id, T>;
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}
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impl<'ir> Ref<'ir> for RawRef<'ir> {
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type Ref<T: 'ir> = &'ir T;
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}
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#[repr(C)]
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#[derive(Debug)]
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pub enum Ir<'ir, R: RefExt<'ir> + ?Sized + 'ir> {
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Int(i64),
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Float(f64),
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Bool(bool),
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Null,
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Str(StringId),
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Path(R::IrRef),
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AttrSet {
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stcs: HashMap<'ir, StringId, (R::MaybeThunkRef, TextRange)>,
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dyns: Vec<'ir, (R::IrRef, R::MaybeThunkRef, TextRange)>,
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},
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List {
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items: Vec<'ir, R::MaybeThunkRef>,
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},
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ConcatStrings {
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parts: Vec<'ir, R::Ref<Ir<'ir, R>>>,
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force_string: bool,
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},
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// OPs
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UnOp {
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rhs: R::IrRef,
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kind: UnOpKind,
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},
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BinOp {
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lhs: R::IrRef,
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rhs: R::IrRef,
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kind: BinOpKind,
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},
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HasAttr {
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lhs: R::IrRef,
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rhs: Vec<'ir, Attr<R::IrRef>>,
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},
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Select {
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expr: R::IrRef,
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attrpath: Vec<'ir, Attr<R::IrRef>>,
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default: Option<R::IrRef>,
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span: TextRange,
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},
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// Conditionals
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If {
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cond: R::IrRef,
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consq: R::IrRef,
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alter: R::IrRef,
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},
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Assert {
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assertion: R::IrRef,
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expr: R::IrRef,
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assertion_raw: String,
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span: TextRange,
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},
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WithLookup {
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sym: StringId,
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namespaces: Vec<'ir, R::MaybeThunkRef>,
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},
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// Function related
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Func {
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body: R::IrRef,
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param: Option<Param<'ir>>,
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thunks: Vec<'ir, (ThunkId, R::IrRef)>,
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},
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Arg {
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layer: u8,
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},
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Call {
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func: R::IrRef,
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arg: R::MaybeThunkRef,
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span: TextRange,
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},
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// Builtins
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Builtins,
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Builtin(BuiltinId),
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BuiltinConst(StringId),
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// Misc
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TopLevel {
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body: R::IrRef,
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thunks: Vec<'ir, (ThunkId, R::IrRef)>,
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},
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MaybeThunk(R::MaybeThunkRef),
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ReplBinding(StringId),
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ScopedImportBinding {
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sym: StringId,
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slot_id: u32,
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},
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}
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#[repr(transparent)]
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
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pub struct ThunkId(pub usize);
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/// Represents a key in an attribute path.
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#[allow(unused)]
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#[derive(Debug)]
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pub enum Attr<Ref> {
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/// A dynamic attribute key, which is an expression that must evaluate to a string.
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/// Example: `attrs.${key}`
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Dynamic(Ref, TextRange),
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/// A static attribute key.
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/// Example: `attrs.key`
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Str(StringId, TextRange),
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}
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/// The kinds of binary operations supported in Nix.
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#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq)]
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pub enum BinOpKind {
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// Arithmetic
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Add,
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Sub,
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Div,
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Mul,
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// Comparison
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Eq,
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Neq,
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Lt,
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Gt,
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Leq,
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Geq,
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// Logical
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And,
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Or,
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Impl,
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// Set/String/Path operations
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Con, // List concatenation (`++`)
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Upd, // AttrSet update (`//`)
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}
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/// The kinds of unary operations.
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#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq)]
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pub enum UnOpKind {
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Neg, // Negation (`-`)
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Not, // Logical not (`!`)
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}
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impl From<ast::UnaryOpKind> for UnOpKind {
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fn from(value: ast::UnaryOpKind) -> Self {
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match value {
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ast::UnaryOpKind::Invert => UnOpKind::Not,
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ast::UnaryOpKind::Negate => UnOpKind::Neg,
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}
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}
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}
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/// Describes the parameters of a function.
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#[derive(Debug)]
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pub struct Param<'ir> {
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pub required: Vec<'ir, (StringId, TextRange)>,
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pub optional: Vec<'ir, (StringId, TextRange)>,
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pub ellipsis: bool,
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}
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pub fn new_global_env(
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strings: &mut DefaultStringInterner,
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) -> hashbrown::HashMap<StringId, MaybeThunk> {
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let mut global_env = hashbrown::HashMap::new();
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let builtins_sym = StringId(strings.get_or_intern("builtins"));
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global_env.insert(builtins_sym, MaybeThunk::Builtins);
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for (idx, &(name, _)) in BUILTINS.iter().enumerate() {
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let id = BuiltinId::try_from_primitive(idx as u8).expect("infallible");
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let name = StringId(strings.get_or_intern(name));
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global_env.insert(name, MaybeThunk::Builtin(id));
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}
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let consts = [
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(
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"__currentSystem",
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MaybeThunk::BuiltinConst(StringId(strings.get_or_intern("currentSystem"))),
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),
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("__langVersion", MaybeThunk::Int(6)),
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(
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"__nixVersion",
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MaybeThunk::BuiltinConst(StringId(strings.get_or_intern("nixVersion"))),
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),
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(
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"__storeDir",
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MaybeThunk::BuiltinConst(StringId(strings.get_or_intern("storeDir"))),
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),
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(
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"__nixPath",
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MaybeThunk::BuiltinConst(StringId(strings.get_or_intern("nixPath"))),
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),
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("null", MaybeThunk::Null),
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("true", MaybeThunk::Bool(true)),
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("false", MaybeThunk::Bool(false)),
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];
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for (name, ir) in consts {
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let name = StringId(strings.get_or_intern(name));
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global_env.insert(name, ir);
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}
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global_env
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}
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