618 lines
19 KiB
Rust
618 lines
19 KiB
Rust
//! This module contains some shared code for encoding and decoding various
|
|
//! things from the `ty` module, and in particular implements support for
|
|
//! "shorthands" which allow to have pointers back into the already encoded
|
|
//! stream instead of re-encoding the same thing twice.
|
|
//!
|
|
//! The functionality in here is shared between persisting to crate metadata and
|
|
//! persisting to incr. comp. caches.
|
|
|
|
use crate::arena::ArenaAllocatable;
|
|
use crate::infer::canonical::{CanonicalVarInfo, CanonicalVarInfos};
|
|
use crate::mir::interpret::CtfeProvenance;
|
|
use crate::mir::{
|
|
self,
|
|
interpret::{AllocId, ConstAllocation},
|
|
};
|
|
use crate::traits;
|
|
use crate::ty::GenericArgsRef;
|
|
use crate::ty::{self, AdtDef, Ty};
|
|
use rustc_data_structures::fx::FxHashMap;
|
|
use rustc_hir::def_id::LocalDefId;
|
|
use rustc_middle::ty::TyCtxt;
|
|
use rustc_serialize::{Decodable, Encodable};
|
|
use rustc_span::Span;
|
|
use rustc_target::abi::{FieldIdx, VariantIdx};
|
|
pub use rustc_type_ir::{TyDecoder, TyEncoder};
|
|
use std::hash::Hash;
|
|
use std::intrinsics;
|
|
use std::marker::DiscriminantKind;
|
|
|
|
/// The shorthand encoding uses an enum's variant index `usize`
|
|
/// and is offset by this value so it never matches a real variant.
|
|
/// This offset is also chosen so that the first byte is never < 0x80.
|
|
pub const SHORTHAND_OFFSET: usize = 0x80;
|
|
|
|
pub trait EncodableWithShorthand<E: TyEncoder>: Copy + Eq + Hash {
|
|
type Variant: Encodable<E>;
|
|
fn variant(&self) -> &Self::Variant;
|
|
}
|
|
|
|
#[allow(rustc::usage_of_ty_tykind)]
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> EncodableWithShorthand<E> for Ty<'tcx> {
|
|
type Variant = ty::TyKind<'tcx>;
|
|
|
|
#[inline]
|
|
fn variant(&self) -> &Self::Variant {
|
|
self.kind()
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> EncodableWithShorthand<E> for ty::PredicateKind<'tcx> {
|
|
type Variant = ty::PredicateKind<'tcx>;
|
|
|
|
#[inline]
|
|
fn variant(&self) -> &Self::Variant {
|
|
self
|
|
}
|
|
}
|
|
|
|
/// Trait for decoding to a reference.
|
|
///
|
|
/// This is a separate trait from `Decodable` so that we can implement it for
|
|
/// upstream types, such as `FxHashSet`.
|
|
///
|
|
/// The `TyDecodable` derive macro will use this trait for fields that are
|
|
/// references (and don't use a type alias to hide that).
|
|
///
|
|
/// `Decodable` can still be implemented in cases where `Decodable` is required
|
|
/// by a trait bound.
|
|
pub trait RefDecodable<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> {
|
|
fn decode(d: &mut D) -> &'tcx Self;
|
|
}
|
|
|
|
/// Encode the given value or a previously cached shorthand.
|
|
pub fn encode_with_shorthand<'tcx, E, T, M>(encoder: &mut E, value: &T, cache: M)
|
|
where
|
|
E: TyEncoder<I = TyCtxt<'tcx>>,
|
|
M: for<'b> Fn(&'b mut E) -> &'b mut FxHashMap<T, usize>,
|
|
T: EncodableWithShorthand<E>,
|
|
// The discriminant and shorthand must have the same size.
|
|
T::Variant: DiscriminantKind<Discriminant = isize>,
|
|
{
|
|
let existing_shorthand = cache(encoder).get(value).copied();
|
|
if let Some(shorthand) = existing_shorthand {
|
|
encoder.emit_usize(shorthand);
|
|
return;
|
|
}
|
|
|
|
let variant = value.variant();
|
|
|
|
let start = encoder.position();
|
|
variant.encode(encoder);
|
|
let len = encoder.position() - start;
|
|
|
|
// The shorthand encoding uses the same usize as the
|
|
// discriminant, with an offset so they can't conflict.
|
|
let discriminant = intrinsics::discriminant_value(variant);
|
|
assert!(SHORTHAND_OFFSET > discriminant as usize);
|
|
|
|
let shorthand = start + SHORTHAND_OFFSET;
|
|
|
|
// Get the number of bits that leb128 could fit
|
|
// in the same space as the fully encoded type.
|
|
let leb128_bits = len * 7;
|
|
|
|
// Check that the shorthand is a not longer than the
|
|
// full encoding itself, i.e., it's an obvious win.
|
|
if leb128_bits >= 64 || (shorthand as u64) < (1 << leb128_bits) {
|
|
cache(encoder).insert(*value, shorthand);
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for Ty<'tcx> {
|
|
fn encode(&self, e: &mut E) {
|
|
encode_with_shorthand(e, self, TyEncoder::type_shorthands);
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E>
|
|
for ty::Binder<'tcx, ty::PredicateKind<'tcx>>
|
|
{
|
|
fn encode(&self, e: &mut E) {
|
|
self.bound_vars().encode(e);
|
|
encode_with_shorthand(e, &self.skip_binder(), TyEncoder::predicate_shorthands);
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for ty::Predicate<'tcx> {
|
|
fn encode(&self, e: &mut E) {
|
|
self.kind().encode(e);
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for ty::Clause<'tcx> {
|
|
fn encode(&self, e: &mut E) {
|
|
self.as_predicate().encode(e);
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for ty::Region<'tcx> {
|
|
fn encode(&self, e: &mut E) {
|
|
self.kind().encode(e);
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for ty::Const<'tcx> {
|
|
fn encode(&self, e: &mut E) {
|
|
self.0.0.encode(e);
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for ConstAllocation<'tcx> {
|
|
fn encode(&self, e: &mut E) {
|
|
self.inner().encode(e)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for AdtDef<'tcx> {
|
|
fn encode(&self, e: &mut E) {
|
|
self.0.0.encode(e)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for AllocId {
|
|
fn encode(&self, e: &mut E) {
|
|
e.encode_alloc_id(self)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for CtfeProvenance {
|
|
fn encode(&self, e: &mut E) {
|
|
self.alloc_id().encode(e);
|
|
self.immutable().encode(e);
|
|
}
|
|
}
|
|
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for ty::ParamEnv<'tcx> {
|
|
fn encode(&self, e: &mut E) {
|
|
self.caller_bounds().encode(e);
|
|
self.reveal().encode(e);
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn decode_arena_allocable<
|
|
'tcx,
|
|
D: TyDecoder<I = TyCtxt<'tcx>>,
|
|
T: ArenaAllocatable<'tcx> + Decodable<D>,
|
|
>(
|
|
decoder: &mut D,
|
|
) -> &'tcx T
|
|
where
|
|
D: TyDecoder,
|
|
{
|
|
decoder.interner().arena.alloc(Decodable::decode(decoder))
|
|
}
|
|
|
|
#[inline]
|
|
fn decode_arena_allocable_slice<
|
|
'tcx,
|
|
D: TyDecoder<I = TyCtxt<'tcx>>,
|
|
T: ArenaAllocatable<'tcx> + Decodable<D>,
|
|
>(
|
|
decoder: &mut D,
|
|
) -> &'tcx [T]
|
|
where
|
|
D: TyDecoder,
|
|
{
|
|
decoder.interner().arena.alloc_from_iter(<Vec<T> as Decodable<D>>::decode(decoder))
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for Ty<'tcx> {
|
|
#[allow(rustc::usage_of_ty_tykind)]
|
|
fn decode(decoder: &mut D) -> Ty<'tcx> {
|
|
// Handle shorthands first, if we have a usize > 0x80.
|
|
if decoder.positioned_at_shorthand() {
|
|
let pos = decoder.read_usize();
|
|
assert!(pos >= SHORTHAND_OFFSET);
|
|
let shorthand = pos - SHORTHAND_OFFSET;
|
|
|
|
decoder.cached_ty_for_shorthand(shorthand, |decoder| {
|
|
decoder.with_position(shorthand, Ty::decode)
|
|
})
|
|
} else {
|
|
let tcx = decoder.interner();
|
|
tcx.mk_ty_from_kind(rustc_type_ir::TyKind::decode(decoder))
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D>
|
|
for ty::Binder<'tcx, ty::PredicateKind<'tcx>>
|
|
{
|
|
fn decode(decoder: &mut D) -> ty::Binder<'tcx, ty::PredicateKind<'tcx>> {
|
|
let bound_vars = Decodable::decode(decoder);
|
|
// Handle shorthands first, if we have a usize > 0x80.
|
|
ty::Binder::bind_with_vars(
|
|
if decoder.positioned_at_shorthand() {
|
|
let pos = decoder.read_usize();
|
|
assert!(pos >= SHORTHAND_OFFSET);
|
|
let shorthand = pos - SHORTHAND_OFFSET;
|
|
|
|
decoder.with_position(shorthand, <ty::PredicateKind<'tcx> as Decodable<D>>::decode)
|
|
} else {
|
|
<ty::PredicateKind<'tcx> as Decodable<D>>::decode(decoder)
|
|
},
|
|
bound_vars,
|
|
)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for ty::Predicate<'tcx> {
|
|
fn decode(decoder: &mut D) -> ty::Predicate<'tcx> {
|
|
let predicate_kind = Decodable::decode(decoder);
|
|
decoder.interner().mk_predicate(predicate_kind)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for ty::Clause<'tcx> {
|
|
fn decode(decoder: &mut D) -> ty::Clause<'tcx> {
|
|
let pred: ty::Predicate<'tcx> = Decodable::decode(decoder);
|
|
pred.expect_clause()
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for GenericArgsRef<'tcx> {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
let len = decoder.read_usize();
|
|
let tcx = decoder.interner();
|
|
tcx.mk_args_from_iter(
|
|
(0..len).map::<ty::GenericArg<'tcx>, _>(|_| Decodable::decode(decoder)),
|
|
)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for mir::Place<'tcx> {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
let local: mir::Local = Decodable::decode(decoder);
|
|
let len = decoder.read_usize();
|
|
let projection = decoder.interner().mk_place_elems_from_iter(
|
|
(0..len).map::<mir::PlaceElem<'tcx>, _>(|_| Decodable::decode(decoder)),
|
|
);
|
|
mir::Place { local, projection }
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for ty::Region<'tcx> {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
ty::Region::new_from_kind(decoder.interner(), Decodable::decode(decoder))
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for CanonicalVarInfos<'tcx> {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
let len = decoder.read_usize();
|
|
decoder.interner().mk_canonical_var_infos_from_iter(
|
|
(0..len).map::<CanonicalVarInfo<'tcx>, _>(|_| Decodable::decode(decoder)),
|
|
)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for AllocId {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
decoder.decode_alloc_id()
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for CtfeProvenance {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
let alloc_id: AllocId = Decodable::decode(decoder);
|
|
let prov = CtfeProvenance::from(alloc_id);
|
|
let immutable: bool = Decodable::decode(decoder);
|
|
if immutable { prov.as_immutable() } else { prov }
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for ty::SymbolName<'tcx> {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
ty::SymbolName::new(decoder.interner(), decoder.read_str())
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for ty::ParamEnv<'tcx> {
|
|
fn decode(d: &mut D) -> Self {
|
|
let caller_bounds = Decodable::decode(d);
|
|
let reveal = Decodable::decode(d);
|
|
ty::ParamEnv::new(caller_bounds, reveal)
|
|
}
|
|
}
|
|
|
|
macro_rules! impl_decodable_via_ref {
|
|
($($t:ty,)+) => {
|
|
$(impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for $t {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
RefDecodable::decode(decoder)
|
|
}
|
|
})*
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for ty::List<Ty<'tcx>> {
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
let len = decoder.read_usize();
|
|
decoder
|
|
.interner()
|
|
.mk_type_list_from_iter((0..len).map::<Ty<'tcx>, _>(|_| Decodable::decode(decoder)))
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D>
|
|
for ty::List<ty::PolyExistentialPredicate<'tcx>>
|
|
{
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
let len = decoder.read_usize();
|
|
decoder.interner().mk_poly_existential_predicates_from_iter(
|
|
(0..len).map::<ty::Binder<'tcx, _>, _>(|_| Decodable::decode(decoder)),
|
|
)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for ty::Const<'tcx> {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
let consts: ty::ConstData<'tcx> = Decodable::decode(decoder);
|
|
decoder.interner().mk_ct_from_kind(consts.kind, consts.ty)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for [ty::ValTree<'tcx>] {
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
decoder
|
|
.interner()
|
|
.arena
|
|
.alloc_from_iter((0..decoder.read_usize()).map(|_| Decodable::decode(decoder)))
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for ConstAllocation<'tcx> {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
decoder.interner().mk_const_alloc(Decodable::decode(decoder))
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for AdtDef<'tcx> {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
decoder.interner().mk_adt_def_from_data(Decodable::decode(decoder))
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for [(ty::Clause<'tcx>, Span)] {
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
decoder
|
|
.interner()
|
|
.arena
|
|
.alloc_from_iter((0..decoder.read_usize()).map(|_| Decodable::decode(decoder)))
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D>
|
|
for ty::List<ty::BoundVariableKind>
|
|
{
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
let len = decoder.read_usize();
|
|
decoder.interner().mk_bound_variable_kinds_from_iter(
|
|
(0..len).map::<ty::BoundVariableKind, _>(|_| Decodable::decode(decoder)),
|
|
)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for ty::List<ty::Const<'tcx>> {
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
let len = decoder.read_usize();
|
|
decoder.interner().mk_const_list_from_iter(
|
|
(0..len).map::<ty::Const<'tcx>, _>(|_| Decodable::decode(decoder)),
|
|
)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D>
|
|
for ty::ListWithCachedTypeInfo<ty::Clause<'tcx>>
|
|
{
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
let len = decoder.read_usize();
|
|
decoder.interner().mk_clauses_from_iter(
|
|
(0..len).map::<ty::Clause<'tcx>, _>(|_| Decodable::decode(decoder)),
|
|
)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for ty::List<FieldIdx> {
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
let len = decoder.read_usize();
|
|
decoder
|
|
.interner()
|
|
.mk_fields_from_iter((0..len).map::<FieldIdx, _>(|_| Decodable::decode(decoder)))
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for ty::List<LocalDefId> {
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
let len = decoder.read_usize();
|
|
decoder.interner().mk_local_def_ids_from_iter(
|
|
(0..len).map::<LocalDefId, _>(|_| Decodable::decode(decoder)),
|
|
)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for &'tcx ty::List<LocalDefId> {
|
|
fn decode(d: &mut D) -> Self {
|
|
RefDecodable::decode(d)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D>
|
|
for ty::List<(VariantIdx, FieldIdx)>
|
|
{
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
let len = decoder.read_usize();
|
|
decoder.interner().mk_offset_of_from_iter(
|
|
(0..len).map::<(VariantIdx, FieldIdx), _>(|_| Decodable::decode(decoder)),
|
|
)
|
|
}
|
|
}
|
|
|
|
impl_decodable_via_ref! {
|
|
&'tcx ty::TypeckResults<'tcx>,
|
|
&'tcx ty::List<Ty<'tcx>>,
|
|
&'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
|
|
&'tcx traits::ImplSource<'tcx, ()>,
|
|
&'tcx mir::Body<'tcx>,
|
|
&'tcx mir::BorrowCheckResult<'tcx>,
|
|
&'tcx mir::coverage::CodeRegion,
|
|
&'tcx ty::List<ty::BoundVariableKind>,
|
|
&'tcx ty::ListWithCachedTypeInfo<ty::Clause<'tcx>>,
|
|
&'tcx ty::List<FieldIdx>,
|
|
&'tcx ty::List<(VariantIdx, FieldIdx)>,
|
|
}
|
|
|
|
#[macro_export]
|
|
macro_rules! __impl_decoder_methods {
|
|
($($name:ident -> $ty:ty;)*) => {
|
|
$(
|
|
#[inline]
|
|
fn $name(&mut self) -> $ty {
|
|
self.opaque.$name()
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
macro_rules! impl_arena_allocatable_decoder {
|
|
([]$args:tt) => {};
|
|
([decode $(, $attrs:ident)*]
|
|
[$name:ident: $ty:ty]) => {
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for $ty {
|
|
#[inline]
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
decode_arena_allocable(decoder)
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for [$ty] {
|
|
#[inline]
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
decode_arena_allocable_slice(decoder)
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
macro_rules! impl_arena_allocatable_decoders {
|
|
([$($a:tt $name:ident: $ty:ty,)*]) => {
|
|
$(
|
|
impl_arena_allocatable_decoder!($a [$name: $ty]);
|
|
)*
|
|
}
|
|
}
|
|
|
|
rustc_hir::arena_types!(impl_arena_allocatable_decoders);
|
|
arena_types!(impl_arena_allocatable_decoders);
|
|
|
|
macro_rules! impl_arena_copy_decoder {
|
|
(<$tcx:tt> $($ty:ty,)*) => {
|
|
$(impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for $ty {
|
|
#[inline]
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
decoder.interner().arena.alloc(Decodable::decode(decoder))
|
|
}
|
|
}
|
|
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for [$ty] {
|
|
#[inline]
|
|
fn decode(decoder: &mut D) -> &'tcx Self {
|
|
decoder.interner().arena.alloc_from_iter(<Vec<_> as Decodable<D>>::decode(decoder))
|
|
}
|
|
})*
|
|
};
|
|
}
|
|
|
|
impl_arena_copy_decoder! {<'tcx>
|
|
Span,
|
|
rustc_span::symbol::Ident,
|
|
ty::Variance,
|
|
rustc_span::def_id::DefId,
|
|
rustc_span::def_id::LocalDefId,
|
|
(rustc_middle::middle::exported_symbols::ExportedSymbol<'tcx>, rustc_middle::middle::exported_symbols::SymbolExportInfo),
|
|
ty::DeducedParamAttrs,
|
|
}
|
|
|
|
#[macro_export]
|
|
macro_rules! implement_ty_decoder {
|
|
($DecoderName:ident <$($typaram:tt),*>) => {
|
|
mod __ty_decoder_impl {
|
|
use rustc_serialize::Decoder;
|
|
|
|
use super::$DecoderName;
|
|
|
|
impl<$($typaram ),*> Decoder for $DecoderName<$($typaram),*> {
|
|
$crate::__impl_decoder_methods! {
|
|
read_usize -> usize;
|
|
read_u128 -> u128;
|
|
read_u64 -> u64;
|
|
read_u32 -> u32;
|
|
read_u16 -> u16;
|
|
read_u8 -> u8;
|
|
|
|
read_isize -> isize;
|
|
read_i128 -> i128;
|
|
read_i64 -> i64;
|
|
read_i32 -> i32;
|
|
read_i16 -> i16;
|
|
}
|
|
|
|
#[inline]
|
|
fn read_raw_bytes(&mut self, len: usize) -> &[u8] {
|
|
self.opaque.read_raw_bytes(len)
|
|
}
|
|
|
|
#[inline]
|
|
fn peek_byte(&self) -> u8 {
|
|
self.opaque.peek_byte()
|
|
}
|
|
|
|
#[inline]
|
|
fn position(&self) -> usize {
|
|
self.opaque.position()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
macro_rules! impl_binder_encode_decode {
|
|
($($t:ty),+ $(,)?) => {
|
|
$(
|
|
impl<'tcx, E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<E> for ty::Binder<'tcx, $t> {
|
|
fn encode(&self, e: &mut E) {
|
|
self.bound_vars().encode(e);
|
|
self.as_ref().skip_binder().encode(e);
|
|
}
|
|
}
|
|
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for ty::Binder<'tcx, $t> {
|
|
fn decode(decoder: &mut D) -> Self {
|
|
let bound_vars = Decodable::decode(decoder);
|
|
ty::Binder::bind_with_vars(Decodable::decode(decoder), bound_vars)
|
|
}
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
impl_binder_encode_decode! {
|
|
&'tcx ty::List<Ty<'tcx>>,
|
|
ty::FnSig<'tcx>,
|
|
ty::Predicate<'tcx>,
|
|
ty::TraitPredicate<'tcx>,
|
|
ty::ExistentialPredicate<'tcx>,
|
|
ty::TraitRef<'tcx>,
|
|
ty::ExistentialTraitRef<'tcx>,
|
|
}
|