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Diffstat (limited to 'compiler/rustc_serialize/src/serialize.rs')
| -rw-r--r-- | compiler/rustc_serialize/src/serialize.rs | 782 |
1 files changed, 782 insertions, 0 deletions
diff --git a/compiler/rustc_serialize/src/serialize.rs b/compiler/rustc_serialize/src/serialize.rs new file mode 100644 index 00000000000..c0e23b89a60 --- /dev/null +++ b/compiler/rustc_serialize/src/serialize.rs @@ -0,0 +1,782 @@ +//! 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] { + 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> { + s.emit_seq(self.len(), |s| { + for (i, e) in self.iter().enumerate() { + s.emit_seq_elt(i, |s| e.encode(s))? + } + Ok(()) + }) + } +} + +impl<D: Decoder, T: Decodable<D>> Decodable<D> for Vec<T> { + 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> Encodable<S> for [u8; 20] { + 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<D: Decoder> Decodable<D> for [u8; 20] { + fn decode(d: &mut D) -> Result<[u8; 20], D::Error> { + d.read_seq(|d, len| { + assert!(len == 20); + let mut v = [0u8; 20]; + 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> { + s.emit_seq(self.len(), |s| { + for (i, e) in self.iter().enumerate() { + s.emit_seq_elt(i, |s| e.encode(s))? + } + Ok(()) + }) + } +} + +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> { + 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(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)?) + } +} |