--- /dev/null
+//! Support code for encoding and decoding types.
+
+/*
+Core encoding and decoding interfaces.
+*/
+
+use std::borrow::Cow;
+use std::cell::{Cell, RefCell};
+use std::marker::PhantomData;
+use std::path;
+use std::rc::Rc;
+use std::sync::Arc;
+
+pub trait Encoder {
+ type Error;
+
+ // Primitive types:
+ fn emit_unit(&mut self) -> Result<(), Self::Error>;
+ fn emit_usize(&mut self, v: usize) -> Result<(), Self::Error>;
+ fn emit_u128(&mut self, v: u128) -> Result<(), Self::Error>;
+ fn emit_u64(&mut self, v: u64) -> Result<(), Self::Error>;
+ fn emit_u32(&mut self, v: u32) -> Result<(), Self::Error>;
+ fn emit_u16(&mut self, v: u16) -> Result<(), Self::Error>;
+ fn emit_u8(&mut self, v: u8) -> Result<(), Self::Error>;
+ fn emit_isize(&mut self, v: isize) -> Result<(), Self::Error>;
+ fn emit_i128(&mut self, v: i128) -> Result<(), Self::Error>;
+ fn emit_i64(&mut self, v: i64) -> Result<(), Self::Error>;
+ fn emit_i32(&mut self, v: i32) -> Result<(), Self::Error>;
+ fn emit_i16(&mut self, v: i16) -> Result<(), Self::Error>;
+ fn emit_i8(&mut self, v: i8) -> Result<(), Self::Error>;
+ fn emit_bool(&mut self, v: bool) -> Result<(), Self::Error>;
+ fn emit_f64(&mut self, v: f64) -> Result<(), Self::Error>;
+ fn emit_f32(&mut self, v: f32) -> Result<(), Self::Error>;
+ fn emit_char(&mut self, v: char) -> Result<(), Self::Error>;
+ fn emit_str(&mut self, v: &str) -> Result<(), Self::Error>;
+
+ // Compound types:
+ #[inline]
+ fn emit_enum<F>(&mut self, _name: &str, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ f(self)
+ }
+
+ fn emit_enum_variant<F>(
+ &mut self,
+ _v_name: &str,
+ v_id: usize,
+ _len: usize,
+ f: F,
+ ) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ self.emit_usize(v_id)?;
+ f(self)
+ }
+
+ #[inline]
+ fn emit_enum_variant_arg<F>(&mut self, _a_idx: usize, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ f(self)
+ }
+
+ fn emit_enum_struct_variant<F>(
+ &mut self,
+ v_name: &str,
+ v_id: usize,
+ len: usize,
+ f: F,
+ ) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ self.emit_enum_variant(v_name, v_id, len, f)
+ }
+
+ fn emit_enum_struct_variant_field<F>(
+ &mut self,
+ _f_name: &str,
+ f_idx: usize,
+ f: F,
+ ) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ self.emit_enum_variant_arg(f_idx, f)
+ }
+
+ #[inline]
+ fn emit_struct<F>(&mut self, _name: &str, _len: usize, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ f(self)
+ }
+
+ #[inline]
+ fn emit_struct_field<F>(
+ &mut self,
+ _f_name: &str,
+ _f_idx: usize,
+ f: F,
+ ) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ f(self)
+ }
+
+ #[inline]
+ fn emit_tuple<F>(&mut self, _len: usize, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ f(self)
+ }
+
+ #[inline]
+ fn emit_tuple_arg<F>(&mut self, _idx: usize, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ f(self)
+ }
+
+ fn emit_tuple_struct<F>(&mut self, _name: &str, len: usize, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ self.emit_tuple(len, f)
+ }
+
+ fn emit_tuple_struct_arg<F>(&mut self, f_idx: usize, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ self.emit_tuple_arg(f_idx, f)
+ }
+
+ // Specialized types:
+ fn emit_option<F>(&mut self, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ self.emit_enum("Option", f)
+ }
+
+ #[inline]
+ fn emit_option_none(&mut self) -> Result<(), Self::Error> {
+ self.emit_enum_variant("None", 0, 0, |_| Ok(()))
+ }
+
+ fn emit_option_some<F>(&mut self, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ self.emit_enum_variant("Some", 1, 1, f)
+ }
+
+ fn emit_seq<F>(&mut self, len: usize, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ self.emit_usize(len)?;
+ f(self)
+ }
+
+ #[inline]
+ fn emit_seq_elt<F>(&mut self, _idx: usize, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ f(self)
+ }
+
+ fn emit_map<F>(&mut self, len: usize, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ self.emit_usize(len)?;
+ f(self)
+ }
+
+ #[inline]
+ fn emit_map_elt_key<F>(&mut self, _idx: usize, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ f(self)
+ }
+
+ #[inline]
+ fn emit_map_elt_val<F>(&mut self, _idx: usize, f: F) -> Result<(), Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<(), Self::Error>,
+ {
+ f(self)
+ }
+}
+
+pub trait Decoder {
+ type Error;
+
+ // Primitive types:
+ fn read_nil(&mut self) -> Result<(), Self::Error>;
+ fn read_usize(&mut self) -> Result<usize, Self::Error>;
+ fn read_u128(&mut self) -> Result<u128, Self::Error>;
+ fn read_u64(&mut self) -> Result<u64, Self::Error>;
+ fn read_u32(&mut self) -> Result<u32, Self::Error>;
+ fn read_u16(&mut self) -> Result<u16, Self::Error>;
+ fn read_u8(&mut self) -> Result<u8, Self::Error>;
+ fn read_isize(&mut self) -> Result<isize, Self::Error>;
+ fn read_i128(&mut self) -> Result<i128, Self::Error>;
+ fn read_i64(&mut self) -> Result<i64, Self::Error>;
+ fn read_i32(&mut self) -> Result<i32, Self::Error>;
+ fn read_i16(&mut self) -> Result<i16, Self::Error>;
+ fn read_i8(&mut self) -> Result<i8, Self::Error>;
+ fn read_bool(&mut self) -> Result<bool, Self::Error>;
+ fn read_f64(&mut self) -> Result<f64, Self::Error>;
+ fn read_f32(&mut self) -> Result<f32, Self::Error>;
+ fn read_char(&mut self) -> Result<char, Self::Error>;
+ fn read_str(&mut self) -> Result<Cow<'_, str>, Self::Error>;
+
+ // Compound types:
+ #[inline]
+ fn read_enum<T, F>(&mut self, _name: &str, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ f(self)
+ }
+
+ #[inline]
+ fn read_enum_variant<T, F>(&mut self, _names: &[&str], mut f: F) -> Result<T, Self::Error>
+ where
+ F: FnMut(&mut Self, usize) -> Result<T, Self::Error>,
+ {
+ let disr = self.read_usize()?;
+ f(self, disr)
+ }
+
+ #[inline]
+ fn read_enum_variant_arg<T, F>(&mut self, _a_idx: usize, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ f(self)
+ }
+
+ fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F) -> Result<T, Self::Error>
+ where
+ F: FnMut(&mut Self, usize) -> Result<T, Self::Error>,
+ {
+ self.read_enum_variant(names, f)
+ }
+
+ fn read_enum_struct_variant_field<T, F>(
+ &mut self,
+ _f_name: &str,
+ f_idx: usize,
+ f: F,
+ ) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ self.read_enum_variant_arg(f_idx, f)
+ }
+
+ #[inline]
+ fn read_struct<T, F>(&mut self, _s_name: &str, _len: usize, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ f(self)
+ }
+
+ #[inline]
+ fn read_struct_field<T, F>(
+ &mut self,
+ _f_name: &str,
+ _f_idx: usize,
+ f: F,
+ ) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ f(self)
+ }
+
+ #[inline]
+ fn read_tuple<T, F>(&mut self, _len: usize, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ f(self)
+ }
+
+ #[inline]
+ fn read_tuple_arg<T, F>(&mut self, _a_idx: usize, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ f(self)
+ }
+
+ fn read_tuple_struct<T, F>(&mut self, _s_name: &str, len: usize, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ self.read_tuple(len, f)
+ }
+
+ fn read_tuple_struct_arg<T, F>(&mut self, a_idx: usize, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ self.read_tuple_arg(a_idx, f)
+ }
+
+ // Specialized types:
+ fn read_option<T, F>(&mut self, mut f: F) -> Result<T, Self::Error>
+ where
+ F: FnMut(&mut Self, bool) -> Result<T, Self::Error>,
+ {
+ self.read_enum("Option", move |this| {
+ this.read_enum_variant(&["None", "Some"], move |this, idx| match idx {
+ 0 => f(this, false),
+ 1 => f(this, true),
+ _ => Err(this.error("read_option: expected 0 for None or 1 for Some")),
+ })
+ })
+ }
+
+ fn read_seq<T, F>(&mut self, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self, usize) -> Result<T, Self::Error>,
+ {
+ let len = self.read_usize()?;
+ f(self, len)
+ }
+
+ #[inline]
+ fn read_seq_elt<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ f(self)
+ }
+
+ fn read_map<T, F>(&mut self, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self, usize) -> Result<T, Self::Error>,
+ {
+ let len = self.read_usize()?;
+ f(self, len)
+ }
+
+ #[inline]
+ fn read_map_elt_key<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ f(self)
+ }
+
+ #[inline]
+ fn read_map_elt_val<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Self::Error>
+ where
+ F: FnOnce(&mut Self) -> Result<T, Self::Error>,
+ {
+ f(self)
+ }
+
+ // Failure
+ fn error(&mut self, err: &str) -> Self::Error;
+}
+
+/// Trait for types that can be serialized
+///
+/// This can be implemented using the `Encodable`, `TyEncodable` and
+/// `MetadataEncodable` macros.
+///
+/// * `Encodable` should be used in crates that don't depend on
+/// `rustc_middle`.
+/// * `MetadataEncodable` is used in `rustc_metadata` for types that contain
+/// `rustc_metadata::rmeta::Lazy`.
+/// * `TyEncodable` should be used for types that are only serialized in crate
+/// metadata or the incremental cache. This is most types in `rustc_middle`.
+pub trait Encodable<S: Encoder> {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error>;
+}
+
+/// Trait for types that can be deserialized
+///
+/// This can be implemented using the `Decodable`, `TyDecodable` and
+/// `MetadataDecodable` macros.
+///
+/// * `Decodable` should be used in crates that don't depend on
+/// `rustc_middle`.
+/// * `MetadataDecodable` is used in `rustc_metadata` for types that contain
+/// `rustc_metadata::rmeta::Lazy`.
+/// * `TyDecodable` should be used for types that are only serialized in crate
+/// metadata or the incremental cache. This is most types in `rustc_middle`.
+pub trait Decodable<D: Decoder>: Sized {
+ fn decode(d: &mut D) -> Result<Self, D::Error>;
+}
+
+macro_rules! direct_serialize_impls {
+ ($($ty:ident $emit_method:ident $read_method:ident),*) => {
+ $(
+ impl<S: Encoder> Encodable<S> for $ty {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ s.$emit_method(*self)
+ }
+ }
+
+ impl<D: Decoder> Decodable<D> for $ty {
+ fn decode(d: &mut D) -> Result<$ty, D::Error> {
+ d.$read_method()
+ }
+ }
+ )*
+ }
+}
+
+direct_serialize_impls! {
+ usize emit_usize read_usize,
+ u8 emit_u8 read_u8,
+ u16 emit_u16 read_u16,
+ u32 emit_u32 read_u32,
+ u64 emit_u64 read_u64,
+ u128 emit_u128 read_u128,
+ isize emit_isize read_isize,
+ i8 emit_i8 read_i8,
+ i16 emit_i16 read_i16,
+ i32 emit_i32 read_i32,
+ i64 emit_i64 read_i64,
+ i128 emit_i128 read_i128,
+ f32 emit_f32 read_f32,
+ f64 emit_f64 read_f64,
+ bool emit_bool read_bool,
+ char emit_char read_char
+}
+
+impl<S: Encoder> Encodable<S> for ::std::num::NonZeroU32 {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ s.emit_u32(self.get())
+ }
+}
+
+impl<D: Decoder> Decodable<D> for ::std::num::NonZeroU32 {
+ fn decode(d: &mut D) -> Result<Self, D::Error> {
+ d.read_u32().map(|d| ::std::num::NonZeroU32::new(d).unwrap())
+ }
+}
+
+impl<S: Encoder> Encodable<S> for str {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ s.emit_str(self)
+ }
+}
+
+impl<S: Encoder> Encodable<S> for &str {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ s.emit_str(self)
+ }
+}
+
+impl<S: Encoder> Encodable<S> for String {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ s.emit_str(&self[..])
+ }
+}
+
+impl<D: Decoder> Decodable<D> for String {
+ fn decode(d: &mut D) -> Result<String, D::Error> {
+ Ok(d.read_str()?.into_owned())
+ }
+}
+
+impl<S: Encoder> Encodable<S> for () {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ s.emit_unit()
+ }
+}
+
+impl<D: Decoder> Decodable<D> for () {
+ fn decode(d: &mut D) -> Result<(), D::Error> {
+ d.read_nil()
+ }
+}
+
+impl<S: Encoder, T> Encodable<S> for PhantomData<T> {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ s.emit_unit()
+ }
+}
+
+impl<D: Decoder, T> Decodable<D> for PhantomData<T> {
+ fn decode(d: &mut D) -> Result<PhantomData<T>, D::Error> {
+ d.read_nil()?;
+ Ok(PhantomData)
+ }
+}
+
+impl<D: Decoder, T: Decodable<D>> Decodable<D> for Box<[T]> {
+ fn decode(d: &mut D) -> Result<Box<[T]>, D::Error> {
+ let v: Vec<T> = Decodable::decode(d)?;
+ Ok(v.into_boxed_slice())
+ }
+}
+
+impl<S: Encoder, T: Encodable<S>> Encodable<S> for Rc<T> {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ (**self).encode(s)
+ }
+}
+
+impl<D: Decoder, T: Decodable<D>> Decodable<D> for Rc<T> {
+ fn decode(d: &mut D) -> Result<Rc<T>, D::Error> {
+ Ok(Rc::new(Decodable::decode(d)?))
+ }
+}
+
+impl<S: Encoder, T: Encodable<S>> Encodable<S> for [T] {
+ default fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ s.emit_seq(self.len(), |s| {
+ for (i, e) in self.iter().enumerate() {
+ s.emit_seq_elt(i, |s| e.encode(s))?
+ }
+ Ok(())
+ })
+ }
+}
+
+impl<S: Encoder, T: Encodable<S>> Encodable<S> for Vec<T> {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ let slice: &[T] = self;
+ slice.encode(s)
+ }
+}
+
+impl<D: Decoder, T: Decodable<D>> Decodable<D> for Vec<T> {
+ default fn decode(d: &mut D) -> Result<Vec<T>, D::Error> {
+ d.read_seq(|d, len| {
+ let mut v = Vec::with_capacity(len);
+ for i in 0..len {
+ v.push(d.read_seq_elt(i, |d| Decodable::decode(d))?);
+ }
+ Ok(v)
+ })
+ }
+}
+
+impl<S: Encoder, T: Encodable<S>, const N: usize> Encodable<S> for [T; N] {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ let slice: &[T] = self;
+ slice.encode(s)
+ }
+}
+
+impl<D: Decoder, const N: usize> Decodable<D> for [u8; N] {
+ fn decode(d: &mut D) -> Result<[u8; N], D::Error> {
+ d.read_seq(|d, len| {
+ assert!(len == N);
+ let mut v = [0u8; N];
+ for i in 0..len {
+ v[i] = d.read_seq_elt(i, |d| Decodable::decode(d))?;
+ }
+ Ok(v)
+ })
+ }
+}
+
+impl<'a, S: Encoder, T: Encodable<S>> Encodable<S> for Cow<'a, [T]>
+where
+ [T]: ToOwned<Owned = Vec<T>>,
+{
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ let slice: &[T] = self;
+ slice.encode(s)
+ }
+}
+
+impl<D: Decoder, T: Decodable<D> + ToOwned> Decodable<D> for Cow<'static, [T]>
+where
+ [T]: ToOwned<Owned = Vec<T>>,
+{
+ fn decode(d: &mut D) -> Result<Cow<'static, [T]>, D::Error> {
+ let v: Vec<T> = Decodable::decode(d)?;
+ Ok(Cow::Owned(v))
+ }
+}
+
+impl<S: Encoder, T: Encodable<S>> Encodable<S> for Option<T> {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ s.emit_option(|s| match *self {
+ None => s.emit_option_none(),
+ Some(ref v) => s.emit_option_some(|s| v.encode(s)),
+ })
+ }
+}
+
+impl<D: Decoder, T: Decodable<D>> Decodable<D> for Option<T> {
+ fn decode(d: &mut D) -> Result<Option<T>, D::Error> {
+ d.read_option(|d, b| if b { Ok(Some(Decodable::decode(d)?)) } else { Ok(None) })
+ }
+}
+
+impl<S: Encoder, T1: Encodable<S>, T2: Encodable<S>> Encodable<S> for Result<T1, T2> {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ s.emit_enum("Result", |s| match *self {
+ Ok(ref v) => {
+ s.emit_enum_variant("Ok", 0, 1, |s| s.emit_enum_variant_arg(0, |s| v.encode(s)))
+ }
+ Err(ref v) => {
+ s.emit_enum_variant("Err", 1, 1, |s| s.emit_enum_variant_arg(0, |s| v.encode(s)))
+ }
+ })
+ }
+}
+
+impl<D: Decoder, T1: Decodable<D>, T2: Decodable<D>> Decodable<D> for Result<T1, T2> {
+ fn decode(d: &mut D) -> Result<Result<T1, T2>, D::Error> {
+ d.read_enum("Result", |d| {
+ d.read_enum_variant(&["Ok", "Err"], |d, disr| match disr {
+ 0 => Ok(Ok(d.read_enum_variant_arg(0, |d| T1::decode(d))?)),
+ 1 => Ok(Err(d.read_enum_variant_arg(0, |d| T2::decode(d))?)),
+ _ => {
+ panic!(
+ "Encountered invalid discriminant while \
+ decoding `Result`."
+ );
+ }
+ })
+ })
+ }
+}
+
+macro_rules! peel {
+ ($name:ident, $($other:ident,)*) => (tuple! { $($other,)* })
+}
+
+/// Evaluates to the number of tokens passed to it.
+///
+/// Logarithmic counting: every one or two recursive expansions, the number of
+/// tokens to count is divided by two, instead of being reduced by one.
+/// Therefore, the recursion depth is the binary logarithm of the number of
+/// tokens to count, and the expanded tree is likewise very small.
+macro_rules! count {
+ () => (0usize);
+ ($one:tt) => (1usize);
+ ($($pairs:tt $_p:tt)*) => (count!($($pairs)*) << 1usize);
+ ($odd:tt $($rest:tt)*) => (count!($($rest)*) | 1usize);
+}
+
+macro_rules! tuple {
+ () => ();
+ ( $($name:ident,)+ ) => (
+ impl<D: Decoder, $($name: Decodable<D>),+> Decodable<D> for ($($name,)+) {
+ #[allow(non_snake_case)]
+ fn decode(d: &mut D) -> Result<($($name,)+), D::Error> {
+ let len: usize = count!($($name)+);
+ d.read_tuple(len, |d| {
+ let mut i = 0;
+ let ret = ($(d.read_tuple_arg({ i+=1; i-1 }, |d| -> Result<$name, D::Error> {
+ Decodable::decode(d)
+ })?,)+);
+ Ok(ret)
+ })
+ }
+ }
+ impl<S: Encoder, $($name: Encodable<S>),+> Encodable<S> for ($($name,)+) {
+ #[allow(non_snake_case)]
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ let ($(ref $name,)+) = *self;
+ let mut n = 0;
+ $(let $name = $name; n += 1;)+
+ s.emit_tuple(n, |s| {
+ let mut i = 0;
+ $(s.emit_tuple_arg({ i+=1; i-1 }, |s| $name.encode(s))?;)+
+ Ok(())
+ })
+ }
+ }
+ peel! { $($name,)+ }
+ )
+}
+
+tuple! { T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, }
+
+impl<S: Encoder> Encodable<S> for path::Path {
+ fn encode(&self, e: &mut S) -> Result<(), S::Error> {
+ self.to_str().unwrap().encode(e)
+ }
+}
+
+impl<S: Encoder> Encodable<S> for path::PathBuf {
+ fn encode(&self, e: &mut S) -> Result<(), S::Error> {
+ path::Path::encode(self, e)
+ }
+}
+
+impl<D: Decoder> Decodable<D> for path::PathBuf {
+ fn decode(d: &mut D) -> Result<path::PathBuf, D::Error> {
+ let bytes: String = Decodable::decode(d)?;
+ Ok(path::PathBuf::from(bytes))
+ }
+}
+
+impl<S: Encoder, T: Encodable<S> + Copy> Encodable<S> for Cell<T> {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ self.get().encode(s)
+ }
+}
+
+impl<D: Decoder, T: Decodable<D> + Copy> Decodable<D> for Cell<T> {
+ fn decode(d: &mut D) -> Result<Cell<T>, D::Error> {
+ Ok(Cell::new(Decodable::decode(d)?))
+ }
+}
+
+// FIXME: #15036
+// Should use `try_borrow`, returning a
+// `encoder.error("attempting to Encode borrowed RefCell")`
+// from `encode` when `try_borrow` returns `None`.
+
+impl<S: Encoder, T: Encodable<S>> Encodable<S> for RefCell<T> {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ self.borrow().encode(s)
+ }
+}
+
+impl<D: Decoder, T: Decodable<D>> Decodable<D> for RefCell<T> {
+ fn decode(d: &mut D) -> Result<RefCell<T>, D::Error> {
+ Ok(RefCell::new(Decodable::decode(d)?))
+ }
+}
+
+impl<S: Encoder, T: Encodable<S>> Encodable<S> for Arc<T> {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ (**self).encode(s)
+ }
+}
+
+impl<D: Decoder, T: Decodable<D>> Decodable<D> for Arc<T> {
+ fn decode(d: &mut D) -> Result<Arc<T>, D::Error> {
+ Ok(Arc::new(Decodable::decode(d)?))
+ }
+}
+
+impl<S: Encoder, T: ?Sized + Encodable<S>> Encodable<S> for Box<T> {
+ fn encode(&self, s: &mut S) -> Result<(), S::Error> {
+ (**self).encode(s)
+ }
+}
+impl<D: Decoder, T: Decodable<D>> Decodable<D> for Box<T> {
+ fn decode(d: &mut D) -> Result<Box<T>, D::Error> {
+ Ok(box Decodable::decode(d)?)
+ }
+}
projects / rustc.git / blobdiff