705 lines
18 KiB
Rust
705 lines
18 KiB
Rust
#![allow(dead_code)]
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use std::cell::RefCell;
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use std::fmt;
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use std::marker::PhantomData;
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use std::mem::size_of;
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use std::ops::Deref;
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use fix_builtins::BuiltinId;
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use fix_common::*;
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use gc_arena::barrier::Unlock;
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use gc_arena::collect::Trace;
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use gc_arena::{Collect, Gc, GcRefLock, Mutation, RefLock};
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use num_enum::TryFromPrimitive;
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use smallvec::SmallVec;
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use string_interner::Symbol;
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use string_interner::symbol::SymbolU32;
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use crate::NixNum;
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use crate::boxing::{RawBox, RawStore, RawTag, Value as RawValue};
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mod private {
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pub trait Cealed {}
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}
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/// # Safety
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///
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/// TAG must be unique among all implementors.
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#[allow(private_interfaces)]
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pub unsafe trait Storable: private::Cealed {
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const TAG: RawTag;
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}
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#[allow(private_bounds)]
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pub trait InlineStorable: Storable + RawStore {}
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pub trait GcStorable: Storable {}
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macro_rules! define_value_types {
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(
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inline { $($itype:ty => $itag:expr, $iname:literal;)* }
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gc { $($gtype:ty => $gtag:expr, $gname:literal;)* }
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) => {
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$(
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#[allow(private_interfaces)]
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unsafe impl Storable for $itype {
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const TAG: RawTag = $itag;
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}
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impl InlineStorable for $itype {}
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impl private::Cealed for $itype {}
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)*
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$(
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#[allow(private_interfaces)]
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unsafe impl Storable for $gtype {
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const TAG: RawTag = $gtag;
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}
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impl GcStorable for $gtype {}
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impl private::Cealed for $gtype {}
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)*
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const _: () = assert!(size_of::<Value<'static>>() == 8);
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$(const _: () = assert!(size_of::<$itype>() <= 6);)*
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const _: () = {
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let tags: &[(bool, u8)] = &[$(RawTag::neg_val($itag)),*, $(RawTag::neg_val($gtag)),*];
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let mut mask_false: u8 = 0;
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let mut mask_true: u8 = 0;
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let mut i = 0;
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while i < tags.len() {
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let (neg, val) = tags[i];
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let bit = 1 << val;
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if neg {
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assert!(mask_true & bit == 0, "duplicate true tag id");
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mask_true |= bit;
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} else {
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assert!(mask_false & bit == 0, "duplicate false tag id");
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mask_false |= bit;
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}
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i += 1;
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}
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};
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unsafe impl<'gc> Collect<'gc> for Value<'gc> {
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const NEEDS_TRACE: bool = true;
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fn trace<T: Trace<'gc>>(&self, cc: &mut T) {
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let Some(tag) = self.raw.tag() else { return };
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match tag {
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$(<$gtype as Storable>::TAG => unsafe {
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self.load_gc::<$gtype>().trace(cc)
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},)*
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$(<$itype as Storable>::TAG => (),)*
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_ => unreachable!("invalid value tag"),
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}
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}
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}
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impl fmt::Debug for Value<'_> {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self.tag() {
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None => write!(f, "Float({:?})", unsafe {
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self.raw.float().unwrap_unchecked()
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}),
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$(Some(<$itype as Storable>::TAG) => write!(f, "{}({:?})", $iname, unsafe {
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self.as_inline::<$itype>().unwrap_unchecked()
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}),)*
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$(Some(<$gtype as Storable>::TAG) =>
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write!(f, "{}(..)", $gname),)*
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_ => unreachable!("invalid value tag"),
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}
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}
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}
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};
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}
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define_value_types! {
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inline {
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i32 => RawTag::P1, "SmallInt";
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bool => RawTag::P2, "Bool";
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Null => RawTag::P3, "Null";
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StringId => RawTag::P4, "SmallString";
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PrimOp => RawTag::P5, "PrimOp";
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}
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gc {
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i64 => RawTag::P6, "BigInt";
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NixString => RawTag::P7, "String";
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AttrSet<'_> => RawTag::N1, "AttrSet";
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List<'_> => RawTag::N2, "List";
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Thunk<'_> => RawTag::N3, "Thunk";
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Closure<'_> => RawTag::N4, "Closure";
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PrimOpApp<'_> => RawTag::N5, "PrimOpApp";
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}
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}
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/// # Nix runtime value representation
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///
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/// NaN-boxed value fitting in 8 bytes.
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#[derive(Copy, Clone)]
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#[repr(transparent)]
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pub struct Value<'gc> {
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raw: RawBox,
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_marker: PhantomData<Gc<'gc, ()>>,
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}
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impl Default for Value<'_> {
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#[inline(always)]
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fn default() -> Self {
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Self::new_inline(Null)
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}
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}
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impl<'gc> Value<'gc> {
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#[inline(always)]
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fn from_raw_value(rv: RawValue) -> Self {
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Self {
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raw: RawBox::from_value(rv),
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_marker: PhantomData,
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}
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}
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/// Load a GC pointer from a value with a negative tag.
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///
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/// # Safety
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///
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/// The value must actually store a `Gc<'gc, T>` with the matching type.
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#[inline(always)]
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unsafe fn load_gc<T: GcStorable>(self) -> Gc<'gc, T> {
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unsafe {
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let rv = self.raw.value().unwrap_unchecked();
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let ptr: *const T = <*const T as RawStore>::from_val(rv);
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Gc::from_ptr(ptr)
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}
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}
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#[inline(always)]
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const fn tag(self) -> Option<RawTag> {
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self.raw.tag()
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}
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}
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impl<'gc> Value<'gc> {
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#[inline]
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pub fn new_float(val: f64) -> Self {
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Self {
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raw: RawBox::from_float(val),
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_marker: PhantomData,
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}
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}
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#[inline]
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pub fn new_inline<T: InlineStorable>(val: T) -> Self {
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Self::from_raw_value(RawValue::store(T::TAG, val))
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}
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#[inline]
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pub fn new_gc<T: GcStorable>(gc: Gc<'gc, T>) -> Self {
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let ptr = Gc::as_ptr(gc);
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Self::from_raw_value(RawValue::store(T::TAG, ptr))
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}
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#[inline]
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pub fn make_int(val: i64, mc: &Mutation<'gc>) -> Self {
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if val >= i32::MIN as i64 && val <= i32::MAX as i64 {
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Value::new_inline(val as i32)
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} else {
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Value::new_gc(Gc::new(mc, val))
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}
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}
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}
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impl<'gc> Value<'gc> {
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#[inline]
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pub fn is_float(self) -> bool {
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self.raw.is_float()
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}
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#[inline]
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pub fn is<T: Storable>(self) -> bool {
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self.tag() == Some(T::TAG)
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}
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}
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impl<'gc> Value<'gc> {
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#[inline]
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pub fn as_float(self) -> Option<f64> {
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self.raw.float().copied()
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}
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#[inline]
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pub fn as_inline<T: InlineStorable>(self) -> Option<T> {
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if self.is::<T>() {
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Some(unsafe {
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let rv = self.raw.value().unwrap_unchecked();
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T::from_val(rv)
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})
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} else {
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None
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}
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}
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#[inline]
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pub fn as_gc<T: GcStorable>(self) -> Option<Gc<'gc, T>> {
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if self.is::<T>() {
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Some(unsafe {
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let rv = self.raw.value().unwrap_unchecked();
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let ptr: *const T = <*const T as RawStore>::from_val(rv);
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Gc::from_ptr(ptr)
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})
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} else {
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None
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}
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}
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#[inline]
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pub(crate) fn to_bits(self) -> u64 {
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self.raw.to_bits()
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}
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#[inline]
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pub fn as_num(self) -> Option<NixNum> {
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if let Some(i) = self.as_inline::<i32>() {
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Some(NixNum::Int(i as i64))
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} else if let Some(gc_i) = self.as_gc::<i64>() {
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Some(NixNum::Int(*gc_i))
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} else {
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self.as_float().map(NixNum::Float)
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}
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}
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#[inline]
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pub fn restrict(self) -> Result<StrictValue<'gc>, Gc<'gc, Thunk<'gc>>> {
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if let Some(thunk) = self.as_gc::<Thunk<'gc>>() {
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Err(thunk)
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} else {
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Ok(StrictValue(self))
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}
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}
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#[inline]
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pub fn ty(self) -> NixType {
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if self.is_float() {
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NixType::Float
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} else if self.is::<i32>() || self.is::<i64>() {
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NixType::Int
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} else if self.is::<bool>() {
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NixType::Bool
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} else if self.is::<Null>() {
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NixType::Null
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} else if self.is::<StringId>() {
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NixType::String
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} else if self.is::<PrimOp>() {
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NixType::PrimOp
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} else if self.is::<NixString>() {
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NixType::String
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} else if self.is::<AttrSet>() {
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NixType::AttrSet
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} else if self.is::<List>() {
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NixType::List
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} else if self.is::<Thunk>() {
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NixType::Thunk
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} else if self.is::<Closure>() {
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NixType::Closure
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} else if self.is::<PrimOpApp>() {
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NixType::PrimOpApp
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} else {
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unreachable!("value has no recognized type tag")
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}
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}
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#[inline]
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pub(crate) fn expect_inline<T: InlineStorable>(self) -> Result<T, NixType> {
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self.as_inline::<T>().ok_or_else(|| self.ty())
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}
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#[inline]
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pub(crate) fn expect_gc<T: GcStorable>(self) -> Result<Gc<'gc, T>, NixType> {
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self.as_gc::<T>().ok_or_else(|| self.ty())
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}
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#[inline]
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pub(crate) fn expect_num(self) -> Result<NixNum, NixType> {
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self.as_num().ok_or_else(|| self.ty())
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}
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#[inline]
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pub(crate) fn expect_bool(self) -> Result<bool, NixType> {
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self.as_inline::<bool>().ok_or_else(|| self.ty())
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}
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#[inline]
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pub(crate) fn expect_float(self) -> Result<f64, NixType> {
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self.as_float().ok_or_else(|| self.ty())
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}
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}
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#[derive(Copy, Clone, Default)]
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#[repr(transparent)]
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pub struct StaticValue(Value<'static>);
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impl<'gc> From<StaticValue> for Value<'gc> {
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#[inline]
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fn from(value: StaticValue) -> Self {
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// SAFETY: StaticValue is guaranteed to not contain any `Gc`.
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unsafe { std::mem::transmute::<Value<'static>, Value<'gc>>(value.0) }
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}
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}
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impl StaticValue {
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#[inline]
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pub fn new_float(val: f64) -> Self {
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Self(Value::new_float(val))
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}
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#[inline]
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pub fn new_inline<T: InlineStorable>(val: T) -> Self {
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Self(Value::new_inline(val))
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}
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#[inline]
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pub fn new_primop(id: BuiltinId, arity: u8, dispatch_ip: u32) -> Self {
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Self(Value::new_inline(PrimOp {
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id,
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arity,
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dispatch_ip,
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}))
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}
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#[inline]
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pub fn is_float(self) -> bool {
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self.0.is_float()
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}
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#[inline]
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pub fn is<T: InlineStorable>(self) -> bool {
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self.0.is::<T>()
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}
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#[inline]
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pub fn as_float(self) -> Option<f64> {
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self.0.as_float()
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}
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#[inline]
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pub fn as_inline<T: InlineStorable>(self) -> Option<T> {
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self.0.as_inline::<T>()
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}
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#[inline]
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pub fn to_bits(self) -> u64 {
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self.0.raw.to_bits()
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}
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}
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#[derive(Clone, Copy, Debug)]
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pub(crate) struct Null;
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impl RawStore for Null {
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fn to_val(self, value: &mut RawValue) {
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value.set_data([0; 6]);
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}
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fn from_val(_: &RawValue) -> Self {
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Self
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}
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}
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impl RawStore for StringId {
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fn to_val(self, value: &mut RawValue) {
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(self.0.to_usize() as u32).to_val(value);
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}
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fn from_val(value: &RawValue) -> Self {
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Self(
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SymbolU32::try_from_usize(u32::from_val(value) as usize)
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.expect("failed to read StringId from Value"),
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)
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}
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}
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/// Heap-allocated Nix string.
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///
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/// Stored on the GC heap via `Gc<'gc, NixString>`. The string data itself
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/// lives in a standard `Box<str>` owned by this struct; the GC only manages
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/// the outer allocation.
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#[derive(Collect)]
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#[collect(require_static)]
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pub(crate) struct NixString {
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data: Box<str>,
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// TODO: string context for derivation dependency tracking
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}
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impl NixString {
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pub(crate) fn new(s: impl Into<Box<str>>) -> Self {
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Self { data: s.into() }
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}
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pub(crate) fn as_str(&self) -> &str {
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&self.data
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}
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}
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impl fmt::Debug for NixString {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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fmt::Debug::fmt(&self.data, f)
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}
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}
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#[derive(Collect, Debug, Default)]
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#[collect(no_drop)]
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pub(crate) struct AttrSet<'gc> {
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entries: SmallVec<[(StringId, Value<'gc>); 4]>,
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}
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impl<'gc> Deref for AttrSet<'gc> {
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type Target = [(StringId, Value<'gc>)];
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fn deref(&self) -> &Self::Target {
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&self.entries
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}
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}
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impl<'gc> AttrSet<'gc> {
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pub(crate) fn from_sorted_unchecked(entries: SmallVec<[(StringId, Value<'gc>); 4]>) -> Self {
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debug_assert!(entries.is_sorted_by_key(|(key, _)| *key));
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Self { entries }
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}
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pub(crate) fn lookup(&self, key: StringId) -> Option<Value<'gc>> {
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self.entries
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.binary_search_by_key(&key, |(k, _)| *k)
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.ok()
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.map(|i| self.entries[i].1)
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}
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pub(crate) fn has(&self, key: StringId) -> bool {
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self.entries.binary_search_by_key(&key, |(k, _)| *k).is_ok()
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}
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pub(crate) fn merge(&self, other: &Self, mc: &Mutation<'gc>) -> Gc<'gc, Self> {
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use std::cmp::Ordering::*;
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debug_assert!(self.entries.is_sorted_by_key(|(key, _)| *key));
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debug_assert!(other.entries.is_sorted_by_key(|(key, _)| *key));
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let mut entries = SmallVec::new();
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let mut i = 0;
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let mut j = 0;
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while i < self.entries.len() && j < other.entries.len() {
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match self.entries[i].0.cmp(&other.entries[j].0) {
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Less => {
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entries.push(self.entries[i]);
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i += 1;
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}
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Greater => {
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entries.push(other.entries[j]);
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j += 1;
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}
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Equal => {
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entries.push(other.entries[j]);
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i += 1;
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j += 1;
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}
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}
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}
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entries.extend(other.entries[j..].iter().cloned());
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entries.extend(self.entries[i..].iter().cloned());
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debug_assert!(entries.is_sorted_by_key(|(key, _)| *key));
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Gc::new(mc, AttrSet { entries })
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}
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}
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#[derive(Collect, Debug, Default)]
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#[repr(transparent)]
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#[collect(no_drop)]
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pub(crate) struct List<'gc> {
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pub(crate) inner: RefLock<SmallVec<[Value<'gc>; 4]>>,
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}
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impl<'gc> List<'gc> {
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pub(crate) fn new(mc: &Mutation<'gc>, data: SmallVec<[Value<'gc>; 4]>) -> Gc<'gc, Self> {
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Gc::new(mc, Self {
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inner: RefLock::new(data)
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})
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}
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pub(crate) fn new_gc(mc: &Mutation<'gc>) -> Gc<'gc, Self> {
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Gc::new(mc, Self::default())
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}
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}
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impl<'gc> Unlock for List<'gc> {
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type Unlocked = RefCell<SmallVec<[Value<'gc>; 4]>>;
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|
unsafe fn unlock_unchecked(&self) -> &Self::Unlocked {
|
|
unsafe { self.inner.unlock_unchecked() }
|
|
}
|
|
}
|
|
|
|
pub(crate) type Thunk<'gc> = RefLock<ThunkState<'gc>>;
|
|
|
|
#[derive(Collect, Debug)]
|
|
#[collect(no_drop)]
|
|
pub(crate) enum ThunkState<'gc> {
|
|
Pending {
|
|
ip: usize,
|
|
env: GcEnv<'gc>,
|
|
with_env: Option<GcWithEnv<'gc>>,
|
|
},
|
|
Apply {
|
|
func: Value<'gc>,
|
|
arg: Value<'gc>,
|
|
},
|
|
Blackhole,
|
|
Evaluated(StrictValue<'gc>),
|
|
}
|
|
|
|
#[derive(Collect, Debug)]
|
|
#[collect(no_drop)]
|
|
pub(crate) struct Env<'gc> {
|
|
pub(crate) locals: SmallVec<[Value<'gc>; 4]>,
|
|
pub(crate) prev: Option<GcEnv<'gc>>,
|
|
}
|
|
pub(crate) type GcEnv<'gc> = GcRefLock<'gc, Env<'gc>>;
|
|
|
|
#[derive(Collect, Debug)]
|
|
#[collect(no_drop)]
|
|
pub(crate) struct WithEnv<'gc> {
|
|
pub(crate) env: Value<'gc>,
|
|
pub(crate) prev: Option<GcWithEnv<'gc>>,
|
|
}
|
|
pub(crate) type GcWithEnv<'gc> = Gc<'gc, WithEnv<'gc>>;
|
|
|
|
impl<'gc> Env<'gc> {
|
|
pub(crate) fn empty() -> Self {
|
|
Env {
|
|
locals: SmallVec::new(),
|
|
prev: None,
|
|
}
|
|
}
|
|
|
|
pub(crate) fn with_arg(
|
|
arg: Value<'gc>,
|
|
n_locals: u32,
|
|
prev: Gc<'gc, RefLock<Env<'gc>>>,
|
|
) -> Self {
|
|
let mut locals = smallvec::smallvec![Value::default(); 1 + n_locals as usize];
|
|
locals[0] = arg;
|
|
Env {
|
|
locals,
|
|
prev: Some(prev),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Collect, Debug)]
|
|
#[collect(no_drop)]
|
|
pub(crate) struct Closure<'gc> {
|
|
pub(crate) ip: u32,
|
|
pub(crate) n_locals: u32,
|
|
pub(crate) env: Gc<'gc, RefLock<Env<'gc>>>,
|
|
pub(crate) pattern: Option<Gc<'gc, PatternInfo>>,
|
|
}
|
|
|
|
#[derive(Collect, Debug)]
|
|
#[collect(require_static)]
|
|
pub(crate) struct PatternInfo {
|
|
pub(crate) required: SmallVec<[StringId; 4]>,
|
|
pub(crate) optional: SmallVec<[StringId; 4]>,
|
|
pub(crate) ellipsis: bool,
|
|
pub(crate) param_spans: Box<[(StringId, u32)]>,
|
|
}
|
|
|
|
#[repr(packed, Rust)]
|
|
#[derive(Clone, Copy, Debug, Collect)]
|
|
#[collect(require_static)]
|
|
pub(crate) struct PrimOp {
|
|
pub(crate) id: BuiltinId,
|
|
pub(crate) arity: u8,
|
|
pub(crate) dispatch_ip: u32,
|
|
}
|
|
|
|
impl RawStore for PrimOp {
|
|
fn to_val(self, value: &mut RawValue) {
|
|
let bytes = self.dispatch_ip.to_le_bytes();
|
|
value.set_data([
|
|
self.id as u8,
|
|
self.arity,
|
|
bytes[0],
|
|
bytes[1],
|
|
bytes[2],
|
|
bytes[3],
|
|
]);
|
|
}
|
|
fn from_val(value: &RawValue) -> Self {
|
|
let [id, arity, bytes @ ..] = *value.data();
|
|
Self {
|
|
id: BuiltinId::try_from_primitive(id).expect("invalid BuiltinId"),
|
|
arity,
|
|
dispatch_ip: u32::from_le_bytes(bytes),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Collect, Debug)]
|
|
#[collect(no_drop)]
|
|
pub(crate) struct PrimOpApp<'gc> {
|
|
pub(crate) primop: PrimOp,
|
|
pub(crate) arity: u8,
|
|
pub(crate) args: [Value<'gc>; 3],
|
|
}
|
|
|
|
#[derive(Copy, Clone, Default, Collect)]
|
|
#[repr(transparent)]
|
|
#[collect(no_drop)]
|
|
pub(crate) struct StrictValue<'gc>(Value<'gc>);
|
|
|
|
impl<'gc> StrictValue<'gc> {
|
|
#[inline]
|
|
pub(crate) fn relax(self) -> Value<'gc> {
|
|
self.0
|
|
}
|
|
}
|
|
|
|
impl<'gc> Deref for StrictValue<'gc> {
|
|
type Target = Value<'gc>;
|
|
#[inline]
|
|
fn deref(&self) -> &Value<'gc> {
|
|
&self.0
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for StrictValue<'_> {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
fmt::Debug::fmt(&self.0, f)
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Copy, Debug, PartialEq, Eq, Collect)]
|
|
#[collect(require_static)]
|
|
pub(crate) enum NixType {
|
|
Int,
|
|
Float,
|
|
Bool,
|
|
Null,
|
|
String,
|
|
AttrSet,
|
|
List,
|
|
Thunk,
|
|
Closure,
|
|
PrimOp,
|
|
PrimOpApp,
|
|
}
|
|
|
|
impl NixType {
|
|
pub fn display(self) -> &'static str {
|
|
use NixType::*;
|
|
match self {
|
|
Int => "an integer",
|
|
Float => "a float",
|
|
Bool => "a boolean",
|
|
Null => "null",
|
|
String => "a string",
|
|
AttrSet => "a set",
|
|
List => "a list",
|
|
Thunk => "a thunk",
|
|
Closure => "a function",
|
|
PrimOp => "a built-in function",
|
|
PrimOpApp => "a partially applied built-in function",
|
|
}
|
|
}
|
|
}
|
|
|
|
impl std::fmt::Display for NixType {
|
|
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
|
|
write!(f, "{}", self.display())
|
|
}
|
|
}
|