ty::ReEmpty => {
// No variant fields to hash for these ...
}
- ty::ReCanonical(c) => {
- c.hash_stable(hcx, hasher);
- }
ty::ReLateBound(db, ty::BrAnon(i)) => {
db.hash_stable(hcx, hasher);
i.hash_stable(hcx, hasher);
}
}
-impl<'gcx> HashStable<StableHashingContext<'gcx>> for ty::BoundTyIndex {
+impl<'gcx> HashStable<StableHashingContext<'gcx>> for ty::BoundVar {
#[inline]
fn hash_stable<W: StableHasherResult>(&self,
hcx: &mut StableHashingContext<'gcx>,
Param(param_ty) => {
param_ty.hash_stable(hcx, hasher);
}
+ Bound(bound_ty) => {
+ bound_ty.hash_stable(hcx, hasher);
+ }
Foreign(def_id) => {
def_id.hash_stable(hcx, hasher);
}
FreshTy(a),
FreshIntTy(a),
FreshFloatTy(a),
- BoundTy(a),
});
impl<'a, 'gcx> HashStable<StableHashingContext<'a>>
use std::sync::atomic::Ordering;
use ty::fold::{TypeFoldable, TypeFolder};
use ty::subst::Kind;
-use ty::{self, BoundTy, BoundTyIndex, Lift, List, Ty, TyCtxt, TypeFlags};
+use ty::{self, BoundTy, BoundVar, Lift, List, Ty, TyCtxt, TypeFlags};
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::indexed_vec::Idx;
query_state: &'cx mut OriginalQueryValues<'tcx>,
// Note that indices is only used once `var_values` is big enough to be
// heap-allocated.
- indices: FxHashMap<Kind<'tcx>, BoundTyIndex>,
+ indices: FxHashMap<Kind<'tcx>, BoundVar>,
canonicalize_region_mode: &'cx dyn CanonicalizeRegionMode,
needs_canonical_flags: TypeFlags,
+
+ binder_index: ty::DebruijnIndex,
}
impl<'cx, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for Canonicalizer<'cx, 'gcx, 'tcx> {
self.tcx
}
+ fn fold_binder<T>(&mut self, t: &ty::Binder<T>) -> ty::Binder<T>
+ where T: TypeFoldable<'tcx>
+ {
+ self.binder_index.shift_in(1);
+ let t = t.super_fold_with(self);
+ self.binder_index.shift_out(1);
+ t
+ }
+
fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
match *r {
- ty::ReLateBound(..) => {
- // leave bound regions alone
- r
+ ty::ReLateBound(index, ..) => {
+ if index >= self.binder_index {
+ bug!("escaping late bound region during canonicalization")
+ } else {
+ r
+ }
}
ty::ReVar(vid) => {
| ty::ReErased => self.canonicalize_region_mode
.canonicalize_free_region(self, r),
- ty::ReClosureBound(..) | ty::ReCanonical(_) => {
- bug!("canonical region encountered during canonicalization")
+ ty::ReClosureBound(..) => {
+ bug!("closure bound region encountered during canonicalization")
}
}
}
bug!("encountered a fresh type during canonicalization")
}
- ty::Infer(ty::BoundTy(_)) => {
- bug!("encountered a canonical type during canonicalization")
+ ty::Bound(bound_ty) => {
+ if bound_ty.index >= self.binder_index {
+ bug!("escaping bound type during canonicalization")
+ } else {
+ t
+ }
}
ty::Closure(..)
where
V: TypeFoldable<'tcx> + Lift<'gcx>,
{
- debug_assert!(
- !value.has_type_flags(TypeFlags::HAS_CANONICAL_VARS),
- "canonicalizing a canonical value: {:?}",
- value,
- );
-
let needs_canonical_flags = if canonicalize_region_mode.any() {
TypeFlags::HAS_FREE_REGIONS | TypeFlags::KEEP_IN_LOCAL_TCX
} else {
variables: SmallVec::new(),
query_state,
indices: FxHashMap::default(),
+ binder_index: ty::INNERMOST,
};
let out_value = value.fold_with(&mut canonicalizer);
/// or returns an existing variable if `kind` has already been
/// seen. `kind` is expected to be an unbound variable (or
/// potentially a free region).
- fn canonical_var(&mut self, info: CanonicalVarInfo, kind: Kind<'tcx>) -> BoundTy {
+ fn canonical_var(&mut self, info: CanonicalVarInfo, kind: Kind<'tcx>) -> BoundVar {
let Canonicalizer {
variables,
query_state,
// direct linear search of `var_values`.
if let Some(idx) = var_values.iter().position(|&k| k == kind) {
// `kind` is already present in `var_values`.
- BoundTyIndex::new(idx)
+ BoundVar::new(idx)
} else {
// `kind` isn't present in `var_values`. Append it. Likewise
// for `info` and `variables`.
*indices = var_values
.iter()
.enumerate()
- .map(|(i, &kind)| (kind, BoundTyIndex::new(i)))
+ .map(|(i, &kind)| (kind, BoundVar::new(i)))
.collect();
}
// The cv is the index of the appended element.
- BoundTyIndex::new(var_values.len() - 1)
+ BoundVar::new(var_values.len() - 1)
}
} else {
// `var_values` is large. Do a hashmap search via `indices`.
variables.push(info);
var_values.push(kind);
assert_eq!(variables.len(), var_values.len());
- BoundTyIndex::new(variables.len() - 1)
+ BoundVar::new(variables.len() - 1)
})
};
- BoundTy {
- level: ty::INNERMOST,
- var,
- }
+ var
}
/// Shorthand helper that creates a canonical region variable for
info: CanonicalVarInfo,
r: ty::Region<'tcx>,
) -> ty::Region<'tcx> {
- let b = self.canonical_var(info, r.into());
- debug_assert_eq!(ty::INNERMOST, b.level);
- self.tcx().mk_region(ty::ReCanonical(b.var))
+ let var = self.canonical_var(info, r.into());
+ let region = ty::ReLateBound(
+ self.binder_index,
+ ty::BoundRegion::BrAnon(var.as_u32())
+ );
+ self.tcx().mk_region(region)
}
/// Given a type variable `ty_var` of the given kind, first check
let info = CanonicalVarInfo {
kind: CanonicalVarKind::Ty(ty_kind),
};
- let b = self.canonical_var(info, ty_var.into());
- debug_assert_eq!(ty::INNERMOST, b.level);
- self.tcx().mk_infer(ty::InferTy::BoundTy(b))
+ let var = self.canonical_var(info, ty_var.into());
+ self.tcx().mk_ty(ty::Bound(BoundTy::new(self.binder_index, var)))
}
}
}
//! - a map M (of type `CanonicalVarValues`) from those canonical
//! variables back to the original.
//!
-//! We can then do queries using T2. These will give back constriants
+//! We can then do queries using T2. These will give back constraints
//! on the canonical variables which can be translated, using the map
//! M, into constraints in our source context. This process of
//! translating the results back is done by the
use syntax::source_map::Span;
use ty::fold::TypeFoldable;
use ty::subst::Kind;
-use ty::{self, BoundTyIndex, Lift, List, Region, TyCtxt};
+use ty::{self, BoundVar, Lift, List, Region, TyCtxt};
mod canonicalizer;
/// canonicalized query response.
#[derive(Clone, Debug, PartialEq, Eq, Hash, RustcDecodable, RustcEncodable)]
pub struct CanonicalVarValues<'tcx> {
- pub var_values: IndexVec<BoundTyIndex, Kind<'tcx>>,
+ pub var_values: IndexVec<BoundVar, Kind<'tcx>>,
}
/// When we canonicalize a value to form a query, we wind up replacing
variables: &List<CanonicalVarInfo>,
universe_map: impl Fn(ty::UniverseIndex) -> ty::UniverseIndex,
) -> CanonicalVarValues<'tcx> {
- let var_values: IndexVec<BoundTyIndex, Kind<'tcx>> = variables
+ let var_values: IndexVec<BoundVar, Kind<'tcx>> = variables
.iter()
.map(|info| self.instantiate_canonical_var(span, *info, &universe_map))
.collect();
} where R: Lift<'tcx>
}
-impl<'tcx> Index<BoundTyIndex> for CanonicalVarValues<'tcx> {
+impl<'tcx> Index<BoundVar> for CanonicalVarValues<'tcx> {
type Output = Kind<'tcx>;
- fn index(&self, value: BoundTyIndex) -> &Kind<'tcx> {
+ fn index(&self, value: BoundVar) -> &Kind<'tcx> {
&self.var_values[value]
}
}
use traits::{Obligation, ObligationCause, PredicateObligation};
use ty::fold::TypeFoldable;
use ty::subst::{Kind, UnpackedKind};
-use ty::{self, BoundTyIndex, Lift, Ty, TyCtxt};
+use ty::{self, BoundVar, Lift, Ty, TyCtxt};
impl<'cx, 'gcx, 'tcx> InferCtxtBuilder<'cx, 'gcx, 'tcx> {
/// The "main method" for a canonicalized trait query. Given the
for (index, original_value) in original_values.var_values.iter().enumerate() {
// ...with the value `v_r` of that variable from the query.
let result_value = query_response.substitute_projected(self.tcx, &result_subst, |v| {
- &v.var_values[BoundTyIndex::new(index)]
+ &v.var_values[BoundVar::new(index)]
});
match (original_value.unpack(), result_value.unpack()) {
(UnpackedKind::Lifetime(ty::ReErased), UnpackedKind::Lifetime(ty::ReErased)) => {
// ...also include the other query region constraints from the query.
output_query_region_constraints.extend(
query_response.value.region_constraints.iter().filter_map(|r_c| {
- let &ty::OutlivesPredicate(k1, r2) = r_c.skip_binder(); // reconstructed below
- let k1 = substitute_value(self.tcx, &result_subst, &k1);
- let r2 = substitute_value(self.tcx, &result_subst, &r2);
+ let r_c = substitute_value(self.tcx, &result_subst, r_c);
+
+ // Screen out `'a: 'a` cases -- we skip the binder here but
+ // only care the inner values to one another, so they are still at
+ // consistent binding levels.
+ let &ty::OutlivesPredicate(k1, r2) = r_c.skip_binder();
if k1 != r2.into() {
- Some(ty::Binder::bind(ty::OutlivesPredicate(k1, r2)))
+ Some(r_c)
} else {
None
}
// is directly equal to one of the canonical variables in the
// result, then we can type the corresponding value from the
// input. See the example above.
- let mut opt_values: IndexVec<BoundTyIndex, Option<Kind<'tcx>>> =
+ let mut opt_values: IndexVec<BoundVar, Option<Kind<'tcx>>> =
IndexVec::from_elem_n(None, query_response.variables.len());
// In terms of our example above, we are iterating over pairs like:
match result_value.unpack() {
UnpackedKind::Type(result_value) => {
// e.g., here `result_value` might be `?0` in the example above...
- if let ty::Infer(ty::InferTy::BoundTy(b)) = result_value.sty {
- // in which case we would set `canonical_vars[0]` to `Some(?U)`.
+ if let ty::Bound(b) = result_value.sty {
+ // ...in which case we would set `canonical_vars[0]` to `Some(?U)`.
+
+ // We only allow a `ty::INNERMOST` index in substitutions.
+ assert_eq!(b.index, ty::INNERMOST);
opt_values[b.var] = Some(*original_value);
}
}
UnpackedKind::Lifetime(result_value) => {
// e.g., here `result_value` might be `'?1` in the example above...
- if let &ty::RegionKind::ReCanonical(index) = result_value {
- // in which case we would set `canonical_vars[0]` to `Some('static)`.
- opt_values[index] = Some(*original_value);
+ if let &ty::RegionKind::ReLateBound(index, br) = result_value {
+ // ... in which case we would set `canonical_vars[0]` to `Some('static)`.
+
+ // We only allow a `ty::INNERMOST` index in substitutions.
+ assert_eq!(index, ty::INNERMOST);
+ opt_values[br.assert_bound_var()] = Some(*original_value);
}
}
}
.enumerate()
.map(|(index, info)| {
if info.is_existential() {
- match opt_values[BoundTyIndex::new(index)] {
+ match opt_values[BoundVar::new(index)] {
Some(k) => k,
None => self.instantiate_canonical_var(cause.span, *info, |u| {
universe_map[u.as_usize()]
// canonical variable; this is taken from
// `query_response.var_values` after applying the substitution
// `result_subst`.
- let substituted_query_response = |index: BoundTyIndex| -> Kind<'tcx> {
+ let substituted_query_response = |index: BoundVar| -> Kind<'tcx> {
query_response.substitute_projected(self.tcx, &result_subst, |v| &v.var_values[index])
};
unsubstituted_region_constraints
.iter()
.map(move |constraint| {
- let ty::OutlivesPredicate(k1, r2) = constraint.skip_binder(); // restored below
- let k1 = substitute_value(self.tcx, result_subst, k1);
- let r2 = substitute_value(self.tcx, result_subst, r2);
+ let constraint = substitute_value(self.tcx, result_subst, constraint);
+ let &ty::OutlivesPredicate(k1, r2) = constraint.skip_binder(); // restored below
Obligation::new(
cause.clone(),
param_env,
match k1.unpack() {
UnpackedKind::Lifetime(r1) => ty::Predicate::RegionOutlives(
- ty::Binder::dummy(
+ ty::Binder::bind(
ty::OutlivesPredicate(r1, r2)
- )),
+ )
+ ),
UnpackedKind::Type(t1) => ty::Predicate::TypeOutlives(
- ty::Binder::dummy(ty::OutlivesPredicate(
- t1, r2
- )))
+ ty::Binder::bind(
+ ty::OutlivesPredicate(t1, r2)
+ )
+ ),
}
)
})
cause: &ObligationCause<'tcx>,
param_env: ty::ParamEnv<'tcx>,
variables1: &OriginalQueryValues<'tcx>,
- variables2: impl Fn(BoundTyIndex) -> Kind<'tcx>,
+ variables2: impl Fn(BoundVar) -> Kind<'tcx>,
) -> InferResult<'tcx, ()> {
self.commit_if_ok(|_| {
let mut obligations = vec![];
for (index, value1) in variables1.var_values.iter().enumerate() {
- let value2 = variables2(BoundTyIndex::new(index));
+ let value2 = variables2(BoundVar::new(index));
match (value1.unpack(), value2.unpack()) {
(UnpackedKind::Type(v1), UnpackedKind::Type(v2)) => {
}
Constraint::RegSubReg(r1, r2) => ty::OutlivesPredicate(r2.into(), r1),
})
- .map(ty::Binder::dummy) // no bound regions in the code above
+ .map(ty::Binder::dummy) // no bound vars in the code above
.chain(
outlives_obligations
.map(|(ty, r)| ty::OutlivesPredicate(ty.into(), r))
- .map(ty::Binder::dummy), // no bound regions in the code above
+ .map(ty::Binder::dummy) // no bound vars in the code above
)
.collect();
//! [c]: https://rust-lang-nursery.github.io/rustc-guide/traits/canonicalization.html
use infer::canonical::{Canonical, CanonicalVarValues};
-use ty::fold::{TypeFoldable, TypeFolder};
+use ty::fold::TypeFoldable;
use ty::subst::UnpackedKind;
-use ty::{self, Ty, TyCtxt, TypeFlags};
+use ty::{self, TyCtxt};
impl<'tcx, V> Canonical<'tcx, V> {
/// Instantiate the wrapped value, replacing each canonical value
T: TypeFoldable<'tcx>,
{
if var_values.var_values.is_empty() {
- debug_assert!(!value.has_type_flags(TypeFlags::HAS_CANONICAL_VARS));
- value.clone()
- } else if !value.has_type_flags(TypeFlags::HAS_CANONICAL_VARS) {
value.clone()
} else {
- value.fold_with(&mut CanonicalVarValuesSubst { tcx, var_values })
- }
-}
-
-struct CanonicalVarValuesSubst<'cx, 'gcx: 'tcx, 'tcx: 'cx> {
- tcx: TyCtxt<'cx, 'gcx, 'tcx>,
- var_values: &'cx CanonicalVarValues<'tcx>,
-}
-
-impl<'cx, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for CanonicalVarValuesSubst<'cx, 'gcx, 'tcx> {
- fn tcx(&self) -> TyCtxt<'_, 'gcx, 'tcx> {
- self.tcx
- }
-
- fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> {
- match t.sty {
- ty::Infer(ty::InferTy::BoundTy(b)) => {
- debug_assert_eq!(ty::INNERMOST, b.level);
- match self.var_values.var_values[b.var].unpack() {
- UnpackedKind::Type(ty) => ty,
- r => bug!("{:?} is a type but value is {:?}", b, r),
- }
+ let fld_r = |br: ty::BoundRegion| {
+ match var_values.var_values[br.assert_bound_var()].unpack() {
+ UnpackedKind::Lifetime(l) => l,
+ r => bug!("{:?} is a region but value is {:?}", br, r),
}
- _ => {
- if !t.has_type_flags(TypeFlags::HAS_CANONICAL_VARS) {
- t
- } else {
- t.super_fold_with(self)
- }
+ };
+
+ let fld_t = |bound_ty: ty::BoundTy| {
+ match var_values.var_values[bound_ty.var].unpack() {
+ UnpackedKind::Type(ty) => ty,
+ r => bug!("{:?} is a type but value is {:?}", bound_ty, r),
}
- }
- }
+ };
- fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
- match r {
- ty::RegionKind::ReCanonical(c) => match self.var_values.var_values[*c].unpack() {
- UnpackedKind::Lifetime(l) => l,
- r => bug!("{:?} is a region but value is {:?}", c, r),
- },
- _ => r.super_fold_with(self),
- }
+ tcx.replace_escaping_bound_vars(value, fld_r, fld_t)
}
}
}
}
- ty::ReCanonical(..) |
ty::ReClosureBound(..) => {
span_bug!(
self.span,
}
// We shouldn't encounter an error message with ReClosureBound.
- ty::ReCanonical(..) | ty::ReClosureBound(..) => {
+ ty::ReClosureBound(..) => {
bug!("encountered unexpected ReClosureBound: {:?}", region,);
}
};
self.tcx().types.re_erased
}
- ty::ReCanonical(..) |
ty::ReClosureBound(..) => {
bug!(
"encountered unexpected region: {:?}",
t
}
- ty::Infer(ty::BoundTy(..)) =>
- bug!("encountered canonical ty during freshening"),
+ ty::Bound(..) =>
+ bug!("encountered bound ty during freshening"),
ty::Generator(..) |
ty::Bool |
fn lub_concrete_regions(&self, a: Region<'tcx>, b: Region<'tcx>) -> Region<'tcx> {
let tcx = self.tcx();
match (a, b) {
- (&ty::ReCanonical(..), _)
- | (_, &ty::ReCanonical(..))
- | (&ty::ReClosureBound(..), _)
+ (&ty::ReClosureBound(..), _)
| (_, &ty::ReClosureBound(..))
| (&ReLateBound(..), _)
| (_, &ReLateBound(..))
ty, region, origin
);
- assert!(!ty.has_escaping_regions());
+ assert!(!ty.has_escaping_bound_vars());
let components = self.tcx.outlives_components(ty);
self.components_must_outlive(origin, components, region);
predicates
.into_iter()
.filter_map(|p| p.as_ref().to_opt_type_outlives())
- .filter_map(|p| p.no_late_bound_regions())
+ .filter_map(|p| p.no_bound_vars())
.filter(move |p| compare_ty(p.0))
}
}
ty::RePlaceholder(placeholder) => placeholder.universe,
ty::ReClosureBound(vid) | ty::ReVar(vid) => self.var_universe(vid),
ty::ReLateBound(..) => bug!("universe(): encountered bound region {:?}", region),
- ty::ReCanonical(..) => bug!(
- "region_universe(): encountered canonical region {:?}",
- region
- ),
}
}
// Shouldn't have any LBR here, so we can safely put
// this under a binder below without fear of accidental
// capture.
- assert!(!a.has_escaping_regions());
- assert!(!b.has_escaping_regions());
+ assert!(!a.has_escaping_bound_vars());
+ assert!(!b.has_escaping_bound_vars());
// can't make progress on `A <: B` if both A and B are
// type variables, so record an obligation. We also
}
&ty::Predicate::TypeOutlives(ref binder) => {
match (
- binder.no_late_bound_regions(),
- binder.map_bound_ref(|pred| pred.0).no_late_bound_regions(),
+ binder.no_bound_vars(),
+ binder.map_bound_ref(|pred| pred.0).no_bound_vars(),
) {
(None, Some(t_a)) => {
select.infcx().register_region_obligation_with_cause(
false
}
- ty::Infer(..) => match in_crate {
+ ty::Bound(..) | ty::Infer(..) => match in_crate {
InCrate::Local => false,
// The inference variable might be unified with a local
// type in that remote crate.
ty::Generator(..) => Some(18),
ty::Foreign(..) => Some(19),
ty::GeneratorWitness(..) => Some(20),
- ty::Infer(..) | ty::Error => None,
+ ty::Bound(..) | ty::Infer(..) | ty::Error => None,
ty::UnnormalizedProjection(..) => bug!("only used with chalk-engine"),
}
}
debug!("normalize_projection_type(projection_ty={:?})",
projection_ty);
- debug_assert!(!projection_ty.has_escaping_regions());
+ debug_assert!(!projection_ty.has_escaping_bound_vars());
// FIXME(#20304) -- cache
}
ty::Predicate::TypeOutlives(ref binder) => {
- // Check if there are higher-ranked regions.
- match binder.no_late_bound_regions() {
+ // Check if there are higher-ranked vars.
+ match binder.no_bound_vars() {
// If there are, inspect the underlying type further.
None => {
// Convert from `Binder<OutlivesPredicate<Ty, Region>>` to `Binder<Ty>`.
let binder = binder.map_bound_ref(|pred| pred.0);
- // Check if the type has any bound regions.
- match binder.no_late_bound_regions() {
+ // Check if the type has any bound vars.
+ match binder.no_bound_vars() {
// If so, this obligation is an error (for now). Eventually we should be
// able to support additional cases here, like `for<'a> &'a str: 'a`.
// NOTE: this is duplicate-implemented between here and fulfillment.
domain_goal: PolyDomainGoal<'tcx>,
tcx: TyCtxt<'a, 'tcx, 'tcx>,
) -> GoalKind<'tcx> {
- match domain_goal.no_late_bound_regions() {
+ match domain_goal.no_bound_vars() {
Some(p) => p.into_goal(),
None => GoalKind::Quantified(
QuantifierKind::Universal,
let ty = ty.super_fold_with(self);
match ty.sty {
- ty::Opaque(def_id, substs) if !substs.has_escaping_regions() => { // (*)
+ ty::Opaque(def_id, substs) if !substs.has_escaping_bound_vars() => { // (*)
// Only normalize `impl Trait` after type-checking, usually in codegen.
match self.param_env.reveal {
Reveal::UserFacing => ty,
}
}
- ty::Projection(ref data) if !data.has_escaping_regions() => { // (*)
+ ty::Projection(ref data) if !data.has_escaping_bound_vars() => { // (*)
// (*) This is kind of hacky -- we need to be able to
// handle normalization within binders because
let infcx = selcx.infcx();
// We don't do cross-snapshot caching of obligations with escaping regions,
// so there's no cache key to use
- predicate.no_late_bound_regions()
+ predicate.no_bound_vars()
.map(|predicate| ProjectionCacheKey {
// We don't attempt to match up with a specific type-variable state
// from a specific call to `opt_normalize_projection_type` - if
| ty::Param(_)
| ty::Opaque(..)
| ty::Infer(_)
+ | ty::Bound(..)
| ty::Generator(..) => false,
ty::UnnormalizedProjection(..) => bug!("only used with chalk-engine"),
fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> {
let ty = ty.super_fold_with(self);
match ty.sty {
- ty::Opaque(def_id, substs) if !substs.has_escaping_regions() => {
+ ty::Opaque(def_id, substs) if !substs.has_escaping_bound_vars() => {
// (*)
// Only normalize `impl Trait` after type-checking, usually in codegen.
match self.param_env.reveal {
}
}
- ty::Projection(ref data) if !data.has_escaping_regions() => {
+ ty::Projection(ref data) if !data.has_escaping_bound_vars() => {
// (*)
// (*) This is kind of hacky -- we need to be able to
// handle normalization within binders because
ty::Predicate::ClosureKind(..) |
ty::Predicate::TypeOutlives(..) |
ty::Predicate::ConstEvaluatable(..) => None,
- ty::Predicate::RegionOutlives(ref data) => data.no_late_bound_regions().map(
+ ty::Predicate::RegionOutlives(ref data) => data.no_bound_vars().map(
|ty::OutlivesPredicate(r_a, r_b)| OutlivesBound::RegionSubRegion(r_b, r_a),
),
})
obligation: &TraitObligation<'tcx>,
) -> SelectionResult<'tcx, Selection<'tcx>> {
debug!("select({:?})", obligation);
- debug_assert!(!obligation.predicate.has_escaping_regions());
+ debug_assert!(!obligation.predicate.has_escaping_bound_vars());
let stack = self.push_stack(TraitObligationStackList::empty(), obligation);
match obligation.predicate {
ty::Predicate::Trait(ref t) => {
- debug_assert!(!t.has_escaping_regions());
+ debug_assert!(!t.has_escaping_bound_vars());
let obligation = obligation.with(t.clone());
self.evaluate_trait_predicate_recursively(previous_stack, obligation)
}
},
ty::Predicate::TypeOutlives(ref binder) => {
- assert!(!binder.has_escaping_regions());
- // Check if the type has higher-ranked regions.
- if binder.skip_binder().0.has_escaping_regions() {
+ assert!(!binder.has_escaping_bound_vars());
+ // Check if the type has higher-ranked vars.
+ if binder.skip_binder().0.has_escaping_bound_vars() {
// If so, this obligation is an error (for now). Eventually we should be
// able to support additional cases here, like `for<'a> &'a str: 'a`.
Ok(EvaluatedToErr)
}
} else {
- // If the type has no late bound regions, then if we assign all
+ // If the type has no late bound vars, then if we assign all
// the inference variables in it to be 'static, then the type
// will be 'static itself.
//
"candidate_from_obligation(cache_fresh_trait_pred={:?}, obligation={:?})",
cache_fresh_trait_pred, stack
);
- debug_assert!(!stack.obligation.predicate.has_escaping_regions());
+ debug_assert!(!stack.obligation.predicate.has_escaping_bound_vars());
if let Some(c) =
self.check_candidate_cache(stack.obligation.param_env, &cache_fresh_trait_pred)
placeholder_map: &infer::PlaceholderMap<'tcx>,
snapshot: &infer::CombinedSnapshot<'cx, 'tcx>,
) -> bool {
- debug_assert!(!skol_trait_ref.has_escaping_regions());
+ debug_assert!(!skol_trait_ref.has_escaping_bound_vars());
if self.infcx
.at(&obligation.cause, obligation.param_env)
.sup(ty::Binder::dummy(skol_trait_ref), trait_bound)
// T: Trait
// so it seems ok if we (conservatively) fail to accept that `Unsize`
// obligation above. Should be possible to extend this in the future.
- let source = match obligation.self_ty().no_late_bound_regions() {
+ let source = match obligation.self_ty().no_bound_vars() {
Some(t) => t,
None => {
// Don't add any candidates if there are bound regions.
ty::Infer(ty::TyVar(_)) => Ambiguous,
ty::UnnormalizedProjection(..)
- | ty::Infer(ty::BoundTy(_))
+ | ty::Bound(_)
| ty::Infer(ty::FreshTy(_))
| ty::Infer(ty::FreshIntTy(_))
| ty::Infer(ty::FreshFloatTy(_)) => {
}
ty::UnnormalizedProjection(..)
- | ty::Infer(ty::BoundTy(_))
+ | ty::Bound(_)
| ty::Infer(ty::FreshTy(_))
| ty::Infer(ty::FreshIntTy(_))
| ty::Infer(ty::FreshFloatTy(_)) => {
| ty::Param(..)
| ty::Foreign(..)
| ty::Projection(..)
- | ty::Infer(ty::BoundTy(_))
+ | ty::Bound(_)
| ty::Infer(ty::TyVar(_))
| ty::Infer(ty::FreshTy(_))
| ty::Infer(ty::FreshIntTy(_))
// assemble_candidates_for_unsizing should ensure there are no late bound
// regions here. See the comment there for more details.
let source = self.infcx
- .shallow_resolve(obligation.self_ty().no_late_bound_regions().unwrap());
+ .shallow_resolve(obligation.self_ty().no_bound_vars().unwrap());
let target = obligation
.predicate
.skip_binder()
sty_debug_print!(
self,
Adt, Array, Slice, RawPtr, Ref, FnDef, FnPtr,
- Generator, GeneratorWitness, Dynamic, Closure, Tuple,
+ Generator, GeneratorWitness, Dynamic, Closure, Tuple, Bound,
Param, Infer, UnnormalizedProjection, Projection, Opaque, Foreign);
println!("Substs interner: #{}", self.interners.substs.borrow().len());
ty::Infer(ty::TyVar(_)) => "inferred type".into(),
ty::Infer(ty::IntVar(_)) => "integral variable".into(),
ty::Infer(ty::FloatVar(_)) => "floating-point variable".into(),
- ty::Infer(ty::BoundTy(_)) |
+ ty::Bound(_) |
ty::Infer(ty::FreshTy(_)) => "fresh type".into(),
ty::Infer(ty::FreshIntTy(_)) => "fresh integral type".into(),
ty::Infer(ty::FreshFloatTy(_)) => "fresh floating-point type".into(),
ty::Foreign(def_id) => {
Some(ForeignSimplifiedType(def_id))
}
- ty::Infer(_) | ty::Error => None,
+ ty::Bound(..) | ty::Infer(_) | ty::Error => None,
}
}
self.add_substs(&substs.substs);
}
+ &ty::Bound(bound_ty) => {
+ self.add_binder(bound_ty.index);
+ }
+
&ty::Infer(infer) => {
self.add_flags(TypeFlags::HAS_FREE_LOCAL_NAMES); // it might, right?
self.add_flags(TypeFlags::HAS_TY_INFER);
match infer {
ty::FreshTy(_) |
ty::FreshIntTy(_) |
- ty::FreshFloatTy(_) |
- ty::BoundTy(_) => {
- self.add_flags(TypeFlags::HAS_CANONICAL_VARS);
+ ty::FreshFloatTy(_) => {
}
ty::TyVar(_) |
&ty::Projection(ref data) => {
// currently we can't normalize projections that
// include bound regions, so track those separately.
- if !data.has_escaping_regions() {
+ if !data.has_escaping_bound_vars() {
self.add_flags(TypeFlags::HAS_NORMALIZABLE_PROJECTION);
}
self.add_flags(TypeFlags::HAS_PROJECTION);
/// bound by `binder` or bound by some binder outside of `binder`.
/// If `binder` is `ty::INNERMOST`, this indicates whether
/// there are any late-bound regions that appear free.
- fn has_regions_bound_at_or_above(&self, binder: ty::DebruijnIndex) -> bool {
- self.visit_with(&mut HasEscapingRegionsVisitor { outer_index: binder })
+ fn has_vars_bound_at_or_above(&self, binder: ty::DebruijnIndex) -> bool {
+ self.visit_with(&mut HasEscapingVarsVisitor { outer_index: binder })
}
/// True if this `self` has any regions that escape `binder` (and
/// hence are not bound by it).
- fn has_regions_bound_above(&self, binder: ty::DebruijnIndex) -> bool {
- self.has_regions_bound_at_or_above(binder.shifted_in(1))
+ fn has_vars_bound_above(&self, binder: ty::DebruijnIndex) -> bool {
+ self.has_vars_bound_at_or_above(binder.shifted_in(1))
}
- fn has_escaping_regions(&self) -> bool {
- self.has_regions_bound_at_or_above(ty::INNERMOST)
+ fn has_escaping_bound_vars(&self) -> bool {
+ self.has_vars_bound_at_or_above(ty::INNERMOST)
}
fn has_type_flags(&self, flags: TypeFlags) -> bool {
}
///////////////////////////////////////////////////////////////////////////
-// Late-bound region replacer
+// Bound vars replacer
-// Replaces the escaping regions in a type.
-
-struct RegionReplacer<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
+/// Replaces the escaping bound vars (late bound regions or bound types) in a type.
+struct BoundVarReplacer<'a, 'gcx: 'a + 'tcx, 'tcx: 'a> {
tcx: TyCtxt<'a, 'gcx, 'tcx>,
/// As with `RegionFolder`, represents the index of a binder *just outside*
current_index: ty::DebruijnIndex,
fld_r: &'a mut (dyn FnMut(ty::BoundRegion) -> ty::Region<'tcx> + 'a),
- map: BTreeMap<ty::BoundRegion, ty::Region<'tcx>>
+ fld_t: &'a mut (dyn FnMut(ty::BoundTy) -> ty::Ty<'tcx> + 'a),
+}
+
+impl<'a, 'gcx, 'tcx> BoundVarReplacer<'a, 'gcx, 'tcx> {
+ fn new<F, G>(
+ tcx: TyCtxt<'a, 'gcx, 'tcx>,
+ fld_r: &'a mut F,
+ fld_t: &'a mut G
+ ) -> Self
+ where F: FnMut(ty::BoundRegion) -> ty::Region<'tcx>,
+ G: FnMut(ty::BoundTy) -> ty::Ty<'tcx>
+ {
+ BoundVarReplacer {
+ tcx,
+ current_index: ty::INNERMOST,
+ fld_r,
+ fld_t,
+ }
+ }
+}
+
+impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for BoundVarReplacer<'a, 'gcx, 'tcx> {
+ fn tcx<'b>(&'b self) -> TyCtxt<'b, 'gcx, 'tcx> { self.tcx }
+
+ fn fold_binder<T: TypeFoldable<'tcx>>(&mut self, t: &ty::Binder<T>) -> ty::Binder<T> {
+ self.current_index.shift_in(1);
+ let t = t.super_fold_with(self);
+ self.current_index.shift_out(1);
+ t
+ }
+
+ fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> {
+ match t.sty {
+ ty::Bound(bound_ty) => {
+ if bound_ty.index == self.current_index {
+ let fld_t = &mut self.fld_t;
+ let ty = fld_t(bound_ty);
+ ty::fold::shift_vars(
+ self.tcx,
+ &ty,
+ self.current_index.as_u32()
+ )
+ } else {
+ t
+ }
+ }
+ _ => {
+ if !t.has_vars_bound_at_or_above(self.current_index) {
+ // Nothing more to substitute.
+ t
+ } else {
+ t.super_fold_with(self)
+ }
+ }
+ }
+ }
+
+ fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
+ match *r {
+ ty::ReLateBound(debruijn, br) if debruijn == self.current_index => {
+ let fld_r = &mut self.fld_r;
+ let region = fld_r(br);
+ if let ty::ReLateBound(debruijn1, br) = *region {
+ // If the callback returns a late-bound region,
+ // that region should always use the INNERMOST
+ // debruijn index. Then we adjust it to the
+ // correct depth.
+ assert_eq!(debruijn1, ty::INNERMOST);
+ self.tcx.mk_region(ty::ReLateBound(debruijn, br))
+ } else {
+ region
+ }
+ }
+ _ => r
+ }
+ }
}
impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
/// same `BoundRegion` will reuse the previous result. A map is
/// returned at the end with each bound region and the free region
/// that replaced it.
- pub fn replace_late_bound_regions<T,F>(self,
+ ///
+ /// This method only replaces late bound regions and the result may still
+ /// contain escaping bound types.
+ pub fn replace_late_bound_regions<T, F>(
+ self,
value: &Binder<T>,
- mut f: F)
- -> (T, BTreeMap<ty::BoundRegion, ty::Region<'tcx>>)
- where F : FnMut(ty::BoundRegion) -> ty::Region<'tcx>,
- T : TypeFoldable<'tcx>,
+ mut fld_r: F
+ ) -> (T, BTreeMap<ty::BoundRegion, ty::Region<'tcx>>)
+ where F: FnMut(ty::BoundRegion) -> ty::Region<'tcx>,
+ T: TypeFoldable<'tcx>
{
- let mut replacer = RegionReplacer::new(self, &mut f);
+ let mut map = BTreeMap::new();
+ let mut real_fldr = |br| {
+ *map.entry(br).or_insert_with(|| fld_r(br))
+ };
+
+ // identity for bound types
+ let mut fld_t = |bound_ty| self.mk_ty(ty::Bound(bound_ty));
+
+ let mut replacer = BoundVarReplacer::new(self, &mut real_fldr, &mut fld_t);
let result = value.skip_binder().fold_with(&mut replacer);
- (result, replacer.map)
+ (result, map)
+ }
+
+ /// Replace all escaping bound vars. The `fld_r` closure replaces escaping
+ /// bound regions while the `fld_t` closure replaces escaping bound types.
+ pub fn replace_escaping_bound_vars<T, F, G>(
+ self,
+ value: &T,
+ mut fld_r: F,
+ mut fld_t: G
+ ) -> T
+ where F: FnMut(ty::BoundRegion) -> ty::Region<'tcx>,
+ G: FnMut(ty::BoundTy) -> ty::Ty<'tcx>,
+ T: TypeFoldable<'tcx>
+ {
+ if !value.has_escaping_bound_vars() {
+ value.clone()
+ } else {
+ let mut replacer = BoundVarReplacer::new(self, &mut fld_r, &mut fld_t);
+ let result = value.fold_with(&mut replacer);
+ result
+ }
+ }
+
+ /// Replace all types or regions bound by the given `Binder`. The `fld_r`
+ /// closure replaces bound regions while the `fld_t` closure replaces bound
+ /// types.
+ pub fn replace_bound_vars<T, F, G>(
+ self,
+ value: &Binder<T>,
+ fld_r: F,
+ fld_t: G
+ ) -> T
+ where F: FnMut(ty::BoundRegion) -> ty::Region<'tcx>,
+ G: FnMut(ty::BoundTy) -> ty::Ty<'tcx>,
+ T: TypeFoldable<'tcx>
+ {
+ self.replace_escaping_bound_vars(value.skip_binder(), fld_r, fld_t)
}
/// Replace any late-bound regions bound in `value` with
}
}
-impl<'a, 'gcx, 'tcx> RegionReplacer<'a, 'gcx, 'tcx> {
- fn new<F>(tcx: TyCtxt<'a, 'gcx, 'tcx>, fld_r: &'a mut F)
- -> RegionReplacer<'a, 'gcx, 'tcx>
- where F : FnMut(ty::BoundRegion) -> ty::Region<'tcx>
- {
- RegionReplacer {
+///////////////////////////////////////////////////////////////////////////
+// Shifter
+//
+// Shifts the De Bruijn indices on all escaping bound vars by a
+// fixed amount. Useful in substitution or when otherwise introducing
+// a binding level that is not intended to capture the existing bound
+// vars. See comment on `shift_vars_through_binders` method in
+// `subst.rs` for more details.
+
+struct Shifter<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
+ tcx: TyCtxt<'a, 'gcx, 'tcx>,
+
+ current_index: ty::DebruijnIndex,
+ amount: u32,
+}
+
+impl Shifter<'a, 'gcx, 'tcx> {
+ pub fn new(tcx: TyCtxt<'a, 'gcx, 'tcx>, amount: u32) -> Self {
+ Shifter {
tcx,
current_index: ty::INNERMOST,
- fld_r,
- map: BTreeMap::default()
+ amount,
}
}
}
-impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for RegionReplacer<'a, 'gcx, 'tcx> {
+impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for Shifter<'a, 'gcx, 'tcx> {
fn tcx<'b>(&'b self) -> TyCtxt<'b, 'gcx, 'tcx> { self.tcx }
fn fold_binder<T: TypeFoldable<'tcx>>(&mut self, t: &ty::Binder<T>) -> ty::Binder<T> {
t
}
- fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> {
- if !t.has_regions_bound_at_or_above(self.current_index) {
- return t;
- }
-
- t.super_fold_with(self)
- }
-
fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
match *r {
- ty::ReLateBound(debruijn, br) if debruijn == self.current_index => {
- let fld_r = &mut self.fld_r;
- let region = *self.map.entry(br).or_insert_with(|| fld_r(br));
- if let ty::ReLateBound(debruijn1, br) = *region {
- // If the callback returns a late-bound region,
- // that region should always use the INNERMOST
- // debruijn index. Then we adjust it to the
- // correct depth.
- assert_eq!(debruijn1, ty::INNERMOST);
- self.tcx.mk_region(ty::ReLateBound(debruijn, br))
+ ty::ReLateBound(debruijn, br) => {
+ if self.amount == 0 || debruijn < self.current_index {
+ r
} else {
- region
+ let shifted = ty::ReLateBound(debruijn.shifted_in(self.amount), br);
+ self.tcx.mk_region(shifted)
}
}
_ => r
}
}
-}
-///////////////////////////////////////////////////////////////////////////
-// Region shifter
-//
-// Shifts the De Bruijn indices on all escaping bound regions by a
-// fixed amount. Useful in substitution or when otherwise introducing
-// a binding level that is not intended to capture the existing bound
-// regions. See comment on `shift_regions_through_binders` method in
-// `subst.rs` for more details.
+ fn fold_ty(&mut self, ty: ty::Ty<'tcx>) -> ty::Ty<'tcx> {
+ match ty.sty {
+ ty::Bound(bound_ty) => {
+ if self.amount == 0 || bound_ty.index < self.current_index {
+ ty
+ } else {
+ let shifted = ty::BoundTy {
+ index: bound_ty.index.shifted_in(self.amount),
+ var: bound_ty.var,
+ kind: bound_ty.kind,
+ };
+ self.tcx.mk_ty(ty::Bound(shifted))
+ }
+ }
-pub fn shift_region(region: ty::RegionKind, amount: u32) -> ty::RegionKind {
- match region {
- ty::ReLateBound(debruijn, br) => {
- ty::ReLateBound(debruijn.shifted_in(amount), br)
- }
- _ => {
- region
+ _ => ty.super_fold_with(self),
}
}
}
-pub fn shift_region_ref<'a, 'gcx, 'tcx>(
+pub fn shift_region<'a, 'gcx, 'tcx>(
tcx: TyCtxt<'a, 'gcx, 'tcx>,
region: ty::Region<'tcx>,
- amount: u32)
- -> ty::Region<'tcx>
-{
+ amount: u32
+) -> ty::Region<'tcx> {
match region {
- &ty::ReLateBound(debruijn, br) if amount > 0 => {
- tcx.mk_region(ty::ReLateBound(debruijn.shifted_in(amount), br))
+ ty::ReLateBound(debruijn, br) if amount > 0 => {
+ tcx.mk_region(ty::ReLateBound(debruijn.shifted_in(amount), *br))
}
_ => {
region
}
}
-pub fn shift_regions<'a, 'gcx, 'tcx, T>(tcx: TyCtxt<'a, 'gcx, 'tcx>,
- amount: u32,
- value: &T) -> T
- where T: TypeFoldable<'tcx>
-{
- debug!("shift_regions(value={:?}, amount={})",
+pub fn shift_vars<'a, 'gcx, 'tcx, T>(
+ tcx: TyCtxt<'a, 'gcx, 'tcx>,
+ value: &T,
+ amount: u32
+) -> T where T: TypeFoldable<'tcx> {
+ debug!("shift_vars(value={:?}, amount={})",
value, amount);
- value.fold_with(&mut RegionFolder::new(tcx, &mut false, &mut |region, _current_depth| {
- shift_region_ref(tcx, region, amount)
- }))
+ value.fold_with(&mut Shifter::new(tcx, amount))
}
-/// An "escaping region" is a bound region whose binder is not part of `t`.
+/// An "escaping var" is a bound var whose binder is not part of `t`. A bound var can be a
+/// bound region or a bound type.
///
/// So, for example, consider a type like the following, which has two binders:
///
/// binders of both `'a` and `'b` are part of the type itself. However, if we consider the *inner
/// fn type*, that type has an escaping region: `'a`.
///
-/// Note that what I'm calling an "escaping region" is often just called a "free region". However,
-/// we already use the term "free region". It refers to the regions that we use to represent bound
-/// regions on a fn definition while we are typechecking its body.
+/// Note that what I'm calling an "escaping var" is often just called a "free var". However,
+/// we already use the term "free var". It refers to the regions or types that we use to represent
+/// bound regions or type params on a fn definition while we are typechecking its body.
///
/// To clarify, conceptually there is no particular difference between
-/// an "escaping" region and a "free" region. However, there is a big
+/// an "escaping" var and a "free" var. However, there is a big
/// difference in practice. Basically, when "entering" a binding
/// level, one is generally required to do some sort of processing to
-/// a bound region, such as replacing it with a fresh/placeholder
-/// region, or making an entry in the environment to represent the
-/// scope to which it is attached, etc. An escaping region represents
-/// a bound region for which this processing has not yet been done.
-struct HasEscapingRegionsVisitor {
+/// a bound var, such as replacing it with a fresh/placeholder
+/// var, or making an entry in the environment to represent the
+/// scope to which it is attached, etc. An escaping var represents
+/// a bound var for which this processing has not yet been done.
+struct HasEscapingVarsVisitor {
/// Anything bound by `outer_index` or "above" is escaping
outer_index: ty::DebruijnIndex,
}
-impl<'tcx> TypeVisitor<'tcx> for HasEscapingRegionsVisitor {
+impl<'tcx> TypeVisitor<'tcx> for HasEscapingVarsVisitor {
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &Binder<T>) -> bool {
self.outer_index.shift_in(1);
let result = t.super_visit_with(self);
// `outer_index`, that means that `t` contains some content
// bound at `outer_index` or above (because
// `outer_exclusive_binder` is always 1 higher than the
- // content in `t`). Therefore, `t` has some escaping regions.
+ // content in `t`). Therefore, `t` has some escaping vars.
t.outer_exclusive_binder > self.outer_index
}
impl<'a, 'b, 'tcx> Instance<'tcx> {
pub fn new(def_id: DefId, substs: &'tcx Substs<'tcx>)
-> Instance<'tcx> {
- assert!(!substs.has_escaping_regions(),
+ assert!(!substs.has_escaping_bound_vars(),
"substs of instance {:?} not normalized for codegen: {:?}",
def_id, substs);
Instance { def: InstanceDef::Item(def_id), substs: substs }
ty::Param(_) |
ty::Opaque(..) |
ty::Infer(_) |
+ ty::Bound(..) |
ty::Error |
ty::GeneratorWitness(..) |
ty::Never |
}
tcx.layout_raw(param_env.and(normalized))?
}
- ty::UnnormalizedProjection(..) | ty::GeneratorWitness(..) | ty::Infer(_) => {
+
+ ty::Bound(..) |
+ ty::UnnormalizedProjection(..) |
+ ty::GeneratorWitness(..) |
+ ty::Infer(_) => {
bug!("LayoutDetails::compute: unexpected type `{}`", ty)
}
+
ty::Param(_) | ty::Error => {
return Err(LayoutError::Unknown(ty));
}
}
}
- ty::Projection(_) | ty::UnnormalizedProjection(..) |
+ ty::Projection(_) | ty::UnnormalizedProjection(..) | ty::Bound(..) |
ty::Opaque(..) | ty::Param(_) | ty::Infer(_) | ty::Error => {
bug!("TyLayout::field_type: unexpected type `{}`", this.ty)
}
use hir;
-pub use self::sty::{Binder, BoundTy, BoundTyIndex, DebruijnIndex, INNERMOST};
+pub use self::sty::{Binder, BoundTy, BoundTyKind, BoundVar, DebruijnIndex, INNERMOST};
pub use self::sty::{FnSig, GenSig, CanonicalPolyFnSig, PolyFnSig, PolyGenSig};
pub use self::sty::{InferTy, ParamTy, ProjectionTy, ExistentialPredicate};
pub use self::sty::{ClosureSubsts, GeneratorSubsts, UpvarSubsts, TypeAndMut};
// Currently we can't normalize projections w/ bound regions.
const HAS_NORMALIZABLE_PROJECTION = 1 << 12;
- // Set if this includes a "canonical" type or region var --
- // ought to be true only for the results of canonicalization.
- const HAS_CANONICAL_VARS = 1 << 13;
-
/// Does this have any `ReLateBound` regions? Used to check
/// if a global bound is safe to evaluate.
- const HAS_RE_LATE_BOUND = 1 << 14;
+ const HAS_RE_LATE_BOUND = 1 << 13;
const NEEDS_SUBST = TypeFlags::HAS_PARAMS.bits |
TypeFlags::HAS_SELF.bits |
TypeFlags::HAS_TY_CLOSURE.bits |
TypeFlags::HAS_FREE_LOCAL_NAMES.bits |
TypeFlags::KEEP_IN_LOCAL_TCX.bits |
- TypeFlags::HAS_CANONICAL_VARS.bits |
TypeFlags::HAS_RE_LATE_BOUND.bits;
}
}
}
}
+ Bound(..) |
Infer(..) => {
bug!("unexpected type `{:?}` in sized_constraint_for_ty",
ty)
// we simply fallback to the most restrictive rule, which
// requires that `Pi: 'a` for all `i`.
ty::Projection(ref data) => {
- if !data.has_escaping_regions() {
+ if !data.has_escaping_bound_vars() {
// best case: no escaping regions, so push the
// projection and skip the subtree (thus generating no
// constraints for Pi). This defers the choice between
ty::FnDef(..) | // OutlivesFunction (*)
ty::FnPtr(_) | // OutlivesFunction (*)
ty::Dynamic(..) | // OutlivesObject, OutlivesFragment (*)
+ ty::Bound(..) |
ty::Error => {
// (*) Bare functions and traits are both binders. In the
// RFC, this means we would add the bound regions to the
ty::UnnormalizedProjection(data.fold_with(folder))
}
ty::Opaque(did, substs) => ty::Opaque(did, substs.fold_with(folder)),
- ty::Bool | ty::Char | ty::Str | ty::Int(_) |
- ty::Uint(_) | ty::Float(_) | ty::Error | ty::Infer(_) |
- ty::Param(..) | ty::Never | ty::Foreign(..) => return self
+
+ ty::Bool |
+ ty::Char |
+ ty::Str |
+ ty::Int(_) |
+ ty::Uint(_) |
+ ty::Float(_) |
+ ty::Error |
+ ty::Infer(_) |
+ ty::Param(..) |
+ ty::Bound(..) |
+ ty::Never |
+ ty::Foreign(..) => return self
};
if self.sty == sty {
data.visit_with(visitor)
}
ty::Opaque(_, ref substs) => substs.visit_with(visitor),
- ty::Bool | ty::Char | ty::Str | ty::Int(_) |
- ty::Uint(_) | ty::Float(_) | ty::Error | ty::Infer(_) |
- ty::Param(..) | ty::Never | ty::Foreign(..) => false,
+
+ ty::Bool |
+ ty::Char |
+ ty::Str |
+ ty::Int(_) |
+ ty::Uint(_) |
+ ty::Float(_) |
+ ty::Error |
+ ty::Infer(_) |
+ ty::Bound(..) |
+ ty::Param(..) |
+ ty::Never |
+ ty::Foreign(..) => false,
}
}
_ => false,
}
}
+
+ /// When canonicalizing, we replace unbound inference variables and free
+ /// regions with anonymous late bound regions. This method asserts that
+ /// we have an anonymous late bound region, which hence may refer to
+ /// a canonical variable.
+ pub fn assert_bound_var(&self) -> BoundVar {
+ match *self {
+ BoundRegion::BrAnon(var) => BoundVar::from_u32(var),
+ _ => bug!("bound region is not anonymous"),
+ }
+ }
}
/// N.B., If you change this, you'll probably want to change the corresponding
/// A type parameter; for example, `T` in `fn f<T>(x: T) {}
Param(ParamTy),
+ /// Bound type variable, used only when preparing a trait query.
+ Bound(BoundTy),
+
/// A type variable used during type checking.
Infer(InferTy),
/// or some placeholder type.
pub fn with_self_ty(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>, self_ty: Ty<'tcx>)
-> ty::TraitRef<'tcx> {
- // otherwise the escaping regions would be captured by the binder
- // debug_assert!(!self_ty.has_escaping_regions());
+ // otherwise the escaping vars would be captured by the binder
+ // debug_assert!(!self_ty.has_escaping_bound_vars());
ty::TraitRef {
def_id: self.def_id,
}
}
-/// Binder is a binder for higher-ranked lifetimes. It is part of the
+/// Binder is a binder for higher-ranked lifetimes or types. It is part of the
/// compiler's representation for things like `for<'a> Fn(&'a isize)`
/// (which would be represented by the type `PolyTraitRef ==
/// Binder<TraitRef>`). Note that when we instantiate,
-/// erase, or otherwise "discharge" these bound regions, we change the
+/// erase, or otherwise "discharge" these bound vars, we change the
/// type from `Binder<T>` to just `T` (see
/// e.g. `liberate_late_bound_regions`).
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, RustcEncodable, RustcDecodable)]
impl<T> Binder<T> {
/// Wraps `value` in a binder, asserting that `value` does not
- /// contain any bound regions that would be bound by the
+ /// contain any bound vars that would be bound by the
/// binder. This is commonly used to 'inject' a value T into a
/// different binding level.
pub fn dummy<'tcx>(value: T) -> Binder<T>
where T: TypeFoldable<'tcx>
{
- debug_assert!(!value.has_escaping_regions());
+ debug_assert!(!value.has_escaping_bound_vars());
Binder(value)
}
- /// Wraps `value` in a binder, binding late-bound regions (if any).
- pub fn bind<'tcx>(value: T) -> Binder<T>
- {
+ /// Wraps `value` in a binder, binding higher-ranked vars (if any).
+ pub fn bind<'tcx>(value: T) -> Binder<T> {
Binder(value)
}
/// Skips the binder and returns the "bound" value. This is a
/// risky thing to do because it's easy to get confused about
/// debruijn indices and the like. It is usually better to
- /// discharge the binder using `no_late_bound_regions` or
+ /// discharge the binder using `no_bound_vars` or
/// `replace_late_bound_regions` or something like
/// that. `skip_binder` is only valid when you are either
- /// extracting data that has nothing to do with bound regions, you
+ /// extracting data that has nothing to do with bound vars, you
/// are doing some sort of test that does not involve bound
/// regions, or you are being very careful about your depth
/// accounting.
///
/// - extracting the def-id from a PolyTraitRef;
/// - comparing the self type of a PolyTraitRef to see if it is equal to
- /// a type parameter `X`, since the type `X` does not reference any regions
+ /// a type parameter `X`, since the type `X` does not reference any regions
pub fn skip_binder(&self) -> &T {
&self.0
}
}
/// Unwraps and returns the value within, but only if it contains
- /// no bound regions at all. (In other words, if this binder --
+ /// no bound vars at all. (In other words, if this binder --
/// and indeed any enclosing binder -- doesn't bind anything at
/// all.) Otherwise, returns `None`.
///
/// (One could imagine having a method that just unwraps a single
- /// binder, but permits late-bound regions bound by enclosing
+ /// binder, but permits late-bound vars bound by enclosing
/// binders, but that would require adjusting the debruijn
/// indices, and given the shallow binding structure we often use,
/// would not be that useful.)
- pub fn no_late_bound_regions<'tcx>(self) -> Option<T>
- where T : TypeFoldable<'tcx>
+ pub fn no_bound_vars<'tcx>(self) -> Option<T>
+ where T: TypeFoldable<'tcx>
{
- if self.skip_binder().has_escaping_regions() {
+ if self.skip_binder().has_escaping_bound_vars() {
None
} else {
Some(self.skip_binder().clone())
/// `ClosureRegionRequirements` that are produced by MIR borrowck.
/// See `ClosureRegionRequirements` for more details.
ReClosureBound(RegionVid),
-
- /// Canonicalized region, used only when preparing a trait query.
- ReCanonical(BoundTyIndex),
}
impl<'tcx> serialize::UseSpecializedDecodable for Region<'tcx> {}
FreshTy(u32),
FreshIntTy(u32),
FreshFloatTy(u32),
-
- /// Bound type variable, used only when preparing a trait query.
- BoundTy(BoundTy),
}
newtype_index! {
- pub struct BoundTyIndex { .. }
+ pub struct BoundVar { .. }
}
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, RustcEncodable, RustcDecodable)]
pub struct BoundTy {
- pub level: DebruijnIndex,
- pub var: BoundTyIndex,
+ pub index: DebruijnIndex,
+ pub var: BoundVar,
+ pub kind: BoundTyKind,
}
-impl_stable_hash_for!(struct BoundTy { level, var });
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, RustcEncodable, RustcDecodable)]
+pub enum BoundTyKind {
+ Anon,
+ Param(InternedString),
+}
+
+impl_stable_hash_for!(struct BoundTy { index, var, kind });
+impl_stable_hash_for!(enum self::BoundTyKind { Anon, Param(a) });
+
+impl BoundTy {
+ pub fn new(index: DebruijnIndex, var: BoundVar) -> Self {
+ BoundTy {
+ index,
+ var,
+ kind: BoundTyKind::Anon,
+ }
+ }
+}
/// A `ProjectionPredicate` for an `ExistentialTraitRef`.
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, RustcEncodable, RustcDecodable)]
-> ty::ProjectionPredicate<'tcx>
{
// otherwise the escaping regions would be captured by the binders
- debug_assert!(!self_ty.has_escaping_regions());
+ debug_assert!(!self_ty.has_escaping_bound_vars());
ty::ProjectionPredicate {
projection_ty: ty::ProjectionTy {
RegionKind::ReEmpty => false,
RegionKind::ReErased => false,
RegionKind::ReClosureBound(..) => false,
- RegionKind::ReCanonical(..) => false,
}
}
}
ty::ReErased => {
}
- ty::ReCanonical(..) => {
- flags = flags | TypeFlags::HAS_FREE_REGIONS;
- flags = flags | TypeFlags::HAS_CANONICAL_VARS;
- }
ty::ReClosureBound(..) => {
flags = flags | TypeFlags::HAS_FREE_REGIONS;
}
Tuple(..) |
Foreign(..) |
Param(_) |
+ Bound(..) |
Infer(_) |
Error => {
vec![]
ty::Infer(ty::TyVar(_)) => false,
- ty::Infer(ty::BoundTy(_)) |
+ ty::Bound(_) |
ty::Infer(ty::FreshTy(_)) |
ty::Infer(ty::FreshIntTy(_)) |
ty::Infer(ty::FreshFloatTy(_)) =>
use hir::def_id::DefId;
use infer::canonical::Canonical;
-use ty::{self, BoundTyIndex, Lift, List, Ty, TyCtxt};
+use ty::{self, BoundVar, Lift, List, Ty, TyCtxt};
use ty::fold::{TypeFoldable, TypeFolder, TypeVisitor};
use serialize::{self, Encodable, Encoder, Decodable, Decoder};
span,
root_ty: None,
ty_stack_depth: 0,
- region_binders_passed: 0 };
+ binders_passed: 0 };
(*self).fold_with(&mut folder)
}
}
ty_stack_depth: usize,
// Number of region binders we have passed through while doing the substitution
- region_binders_passed: u32,
+ binders_passed: u32,
}
impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for SubstFolder<'a, 'gcx, 'tcx> {
fn tcx<'b>(&'b self) -> TyCtxt<'b, 'gcx, 'tcx> { self.tcx }
fn fold_binder<T: TypeFoldable<'tcx>>(&mut self, t: &ty::Binder<T>) -> ty::Binder<T> {
- self.region_binders_passed += 1;
+ self.binders_passed += 1;
let t = t.super_fold_with(self);
- self.region_binders_passed -= 1;
+ self.binders_passed -= 1;
t
}
}
};
- self.shift_regions_through_binders(ty)
+ self.shift_vars_through_binders(ty)
}
/// It is sometimes necessary to adjust the debruijn indices during substitution. This occurs
- /// when we are substituting a type with escaping regions into a context where we have passed
- /// through region binders. That's quite a mouthful. Let's see an example:
+ /// when we are substituting a type with escaping bound vars into a context where we have
+ /// passed through binders. That's quite a mouthful. Let's see an example:
///
/// ```
/// type Func<A> = fn(A);
/// As indicated in the diagram, here the same type `&'a int` is substituted once, but in the
/// first case we do not increase the Debruijn index and in the second case we do. The reason
/// is that only in the second case have we passed through a fn binder.
- fn shift_regions_through_binders(&self, ty: Ty<'tcx>) -> Ty<'tcx> {
- debug!("shift_regions(ty={:?}, region_binders_passed={:?}, has_escaping_regions={:?})",
- ty, self.region_binders_passed, ty.has_escaping_regions());
+ fn shift_vars_through_binders(&self, ty: Ty<'tcx>) -> Ty<'tcx> {
+ debug!("shift_vars(ty={:?}, binders_passed={:?}, has_escaping_bound_vars={:?})",
+ ty, self.binders_passed, ty.has_escaping_bound_vars());
- if self.region_binders_passed == 0 || !ty.has_escaping_regions() {
+ if self.binders_passed == 0 || !ty.has_escaping_bound_vars() {
return ty;
}
- let result = ty::fold::shift_regions(self.tcx(), self.region_binders_passed, &ty);
- debug!("shift_regions: shifted result = {:?}", result);
+ let result = ty::fold::shift_vars(self.tcx(), &ty, self.binders_passed);
+ debug!("shift_vars: shifted result = {:?}", result);
result
}
fn shift_region_through_binders(&self, region: ty::Region<'tcx>) -> ty::Region<'tcx> {
- if self.region_binders_passed == 0 || !region.has_escaping_regions() {
+ if self.binders_passed == 0 || !region.has_escaping_bound_vars() {
return region;
}
- self.tcx().mk_region(ty::fold::shift_region(*region, self.region_binders_passed))
+ ty::fold::shift_region(self.tcx, region, self.binders_passed)
}
}
return false;
}
- self.value.substs.iter().zip(BoundTyIndex::new(0)..).all(|(kind, cvar)| {
+ self.value.substs.iter().zip(BoundVar::new(0)..).all(|(kind, cvar)| {
match kind.unpack() {
UnpackedKind::Type(ty) => match ty.sty {
- ty::Infer(ty::BoundTy(ref b)) => cvar == b.var,
+ ty::Bound(b) => {
+ // We only allow a `ty::INNERMOST` index in substitutions.
+ assert_eq!(b.index, ty::INNERMOST);
+ cvar == b.var
+ }
_ => false,
},
UnpackedKind::Lifetime(r) => match r {
- ty::ReCanonical(cvar1) => cvar == *cvar1,
+ ty::ReLateBound(index, br) => {
+ // We only allow a `ty::INNERMOST` index in substitutions.
+ assert_eq!(*index, ty::INNERMOST);
+ cvar == br.assert_bound_var()
+ }
_ => false,
},
}
erased_self_ty,
predicates);
- assert!(!erased_self_ty.has_escaping_regions());
+ assert!(!erased_self_ty.has_escaping_bound_vars());
traits::elaborate_predicates(self, predicates)
.filter_map(|predicate| {
// construct such an object, but this seems
// correct even if that code changes).
let ty::OutlivesPredicate(ref t, ref r) = predicate.skip_binder();
- if t == &erased_self_ty && !r.has_escaping_regions() {
+ if t == &erased_self_ty && !r.has_escaping_bound_vars() {
Some(*r)
} else {
None
// Can refer to a type which may drop.
// FIXME(eddyb) check this against a ParamEnv.
- ty::Dynamic(..) | ty::Projection(..) | ty::Param(_) |
+ ty::Dynamic(..) | ty::Projection(..) | ty::Param(_) | ty::Bound(..) |
ty::Opaque(..) | ty::Infer(_) | ty::Error => true,
ty::UnnormalizedProjection(..) => bug!("only used with chalk-engine"),
match parent_ty.sty {
ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) |
ty::Str | ty::Infer(_) | ty::Param(_) | ty::Never | ty::Error |
- ty::Foreign(..) => {
+ ty::Bound(..) | ty::Foreign(..) => {
}
ty::Array(ty, len) => {
push_const(stack, len);
let infcx = &mut self.infcx;
let param_env = self.param_env;
self.out.iter()
- .inspect(|pred| assert!(!pred.has_escaping_regions()))
+ .inspect(|pred| assert!(!pred.has_escaping_bound_vars()))
.flat_map(|pred| {
let mut selcx = traits::SelectionContext::new(infcx);
let pred = traits::normalize(&mut selcx, param_env, cause.clone(), pred);
self.out.extend(
trait_ref.substs.types()
- .filter(|ty| !ty.has_escaping_regions())
+ .filter(|ty| !ty.has_escaping_bound_vars())
.map(|ty| traits::Obligation::new(cause.clone(),
param_env,
ty::Predicate::WellFormed(ty))));
let trait_ref = data.trait_ref(self.infcx.tcx);
self.compute_trait_ref(&trait_ref, Elaborate::None);
- if !data.has_escaping_regions() {
+ if !data.has_escaping_bound_vars() {
let predicate = trait_ref.to_predicate();
let cause = self.cause(traits::ProjectionWf(data));
self.out.push(traits::Obligation::new(cause, self.param_env, predicate));
}
fn require_sized(&mut self, subty: Ty<'tcx>, cause: traits::ObligationCauseCode<'tcx>) {
- if !subty.has_escaping_regions() {
+ if !subty.has_escaping_bound_vars() {
let cause = self.cause(cause);
let trait_ref = ty::TraitRef {
def_id: self.infcx.tcx.require_lang_item(lang_items::SizedTraitLangItem),
ty::GeneratorWitness(..) |
ty::Never |
ty::Param(_) |
+ ty::Bound(..) |
ty::Foreign(..) => {
// WfScalar, WfParameter, etc
}
ty::Ref(r, rty, _) => {
// WfReference
- if !r.has_escaping_regions() && !rty.has_escaping_regions() {
+ if !r.has_escaping_bound_vars() && !rty.has_escaping_bound_vars() {
let cause = self.cause(traits::ReferenceOutlivesReferent(ty));
self.out.push(
traits::Obligation::new(
.map(|pred| traits::Obligation::new(cause.clone(),
self.param_env,
pred))
- .filter(|pred| !pred.has_escaping_regions())
+ .filter(|pred| !pred.has_escaping_bound_vars())
.collect()
}
// Note: in fact we only permit builtin traits, not `Bar<'d>`, I
// am looking forward to the future here.
- if !data.has_escaping_regions() {
+ if !data.has_escaping_bound_vars() {
let implicit_bounds =
object_region_bounds(self.infcx.tcx, data);
use ty::{BrAnon, BrEnv, BrFresh, BrNamed};
use ty::{Bool, Char, Adt};
use ty::{Error, Str, Array, Slice, Float, FnDef, FnPtr};
-use ty::{Param, RawPtr, Ref, Never, Tuple};
+use ty::{Param, Bound, RawPtr, Ref, Never, Tuple};
use ty::{Closure, Generator, GeneratorWitness, Foreign, Projection, Opaque};
use ty::{UnnormalizedProjection, Dynamic, Int, Uint, Infer};
use ty::{self, RegionVid, Ty, TyCtxt, TypeFoldable, GenericParamCount, GenericParamDefKind};
ty::ReEarlyBound(ref data) => {
write!(f, "{}", data.name)
}
- ty::ReCanonical(_) => {
- write!(f, "'_")
- }
ty::ReLateBound(_, br) |
ty::ReFree(ty::FreeRegion { bound_region: br, .. }) |
ty::RePlaceholder(ty::Placeholder { name: br, .. }) => {
write!(f, "{:?}", vid)
}
- ty::ReCanonical(c) => {
- write!(f, "'?{}", c.index())
- }
-
ty::RePlaceholder(placeholder) => {
write!(f, "RePlaceholder({:?})", placeholder)
}
ty::TyVar(_) => write!(f, "_"),
ty::IntVar(_) => write!(f, "{}", "{integer}"),
ty::FloatVar(_) => write!(f, "{}", "{float}"),
- ty::BoundTy(_) => write!(f, "_"),
ty::FreshTy(v) => write!(f, "FreshTy({})", v),
ty::FreshIntTy(v) => write!(f, "FreshIntTy({})", v),
ty::FreshFloatTy(v) => write!(f, "FreshFloatTy({})", v)
ty::TyVar(ref v) => write!(f, "{:?}", v),
ty::IntVar(ref v) => write!(f, "{:?}", v),
ty::FloatVar(ref v) => write!(f, "{:?}", v),
- ty::BoundTy(v) => write!(f, "?{:?}", v.var.index()),
ty::FreshTy(v) => write!(f, "FreshTy({:?})", v),
ty::FreshIntTy(v) => write!(f, "FreshIntTy({:?})", v),
ty::FreshFloatTy(v) => write!(f, "FreshFloatTy({:?})", v)
Infer(infer_ty) => write!(f, "{}", infer_ty),
Error => write!(f, "[type error]"),
Param(ref param_ty) => write!(f, "{}", param_ty),
+ Bound(bound_ty) => {
+ match bound_ty.kind {
+ ty::BoundTyKind::Anon => {
+ if bound_ty.index == ty::INNERMOST {
+ write!(f, "?{}", bound_ty.var.index())
+ } else {
+ write!(f, "?{}_{}", bound_ty.index.index(), bound_ty.var.index())
+ }
+ }
+
+ ty::BoundTyKind::Param(p) => write!(f, "{}", p),
+ }
+ }
Adt(def, substs) => cx.parameterized(f, substs, def.did, &[]),
Dynamic(data, r) => {
let r = r.print_to_string(cx);
// These cannot exist in borrowck
RegionKind::ReVar(..) |
- RegionKind::ReCanonical(..) |
RegionKind::RePlaceholder(..) |
RegionKind::ReClosureBound(..) |
RegionKind::ReErased => span_bug!(borrow_span,
ty::ReStatic => self.item_ub,
- ty::ReCanonical(_) |
ty::ReEmpty |
ty::ReClosureBound(..) |
ty::ReLateBound(..) |
// regions must appear in the argument
// listing.
let main_ret_ty = cx.tcx.erase_regions(
- &main_ret_ty.no_late_bound_regions().unwrap(),
+ &main_ret_ty.no_bound_vars().unwrap(),
);
if declare::get_defined_value(cx, "main").is_some() {
debug!("get_fn(instance={:?})", instance);
assert!(!instance.substs.needs_infer());
- assert!(!instance.substs.has_escaping_regions());
+ assert!(!instance.substs.has_escaping_bound_vars());
assert!(!instance.substs.has_param_types());
let sig = instance.fn_sig(cx.tcx);
ty::Infer(_) |
ty::UnnormalizedProjection(..) |
ty::Projection(..) |
+ ty::Bound(..) |
ty::Opaque(..) |
ty::GeneratorWitness(..) |
ty::Param(_) => {
debug!("llvm_type({:#?})", self);
- assert!(!self.ty.has_escaping_regions(), "{:?} has escaping regions", self.ty);
+ assert!(!self.ty.has_escaping_bound_vars(), "{:?} has escaping bound vars", self.ty);
// Make sure lifetimes are erased, to avoid generating distinct LLVM
// types for Rust types that only differ in the choice of lifetimes.
// Theta = [A -> &'a foo]
env.create_simple_region_hierarchy();
- assert!(!env.t_nil().has_escaping_regions());
+ assert!(!env.t_nil().has_escaping_bound_vars());
let t_rptr_free1 = env.t_rptr_free(1);
- assert!(!t_rptr_free1.has_escaping_regions());
+ assert!(!t_rptr_free1.has_escaping_bound_vars());
let t_rptr_bound1 = env.t_rptr_late_bound_with_debruijn(1, d1());
- assert!(t_rptr_bound1.has_escaping_regions());
+ assert!(t_rptr_bound1.has_escaping_bound_vars());
let t_rptr_bound2 = env.t_rptr_late_bound_with_debruijn(1, d2());
- assert!(t_rptr_bound2.has_escaping_regions());
+ assert!(t_rptr_bound2.has_escaping_bound_vars());
// t_fn = fn(A)
let t_param = env.t_param(0);
- assert!(!t_param.has_escaping_regions());
+ assert!(!t_param.has_escaping_bound_vars());
let t_fn = env.t_fn(&[t_param], env.t_nil());
- assert!(!t_fn.has_escaping_regions());
+ assert!(!t_fn.has_escaping_bound_vars());
})
}
ty::Param(..) |
ty::Infer(..) |
+ ty::Bound(..) |
ty::Error |
ty::Closure(..) |
ty::Generator(..) |
| ty::RePlaceholder(..)
| ty::ReEmpty
| ty::ReErased
- | ty::ReClosureBound(..)
- | ty::ReCanonical(..) => None,
+ | ty::ReClosureBound(..) => None,
}
}
// when we move to universes, we will, and this assertion
// will start to fail.
let ty::OutlivesPredicate(k1, r2) =
- query_constraint.no_late_bound_regions().unwrap_or_else(|| {
+ query_constraint.no_bound_vars().unwrap_or_else(|| {
bug!(
- "query_constraint {:?} contained bound regions",
+ "query_constraint {:?} contained bound vars",
query_constraint,
);
});
}
fn sanitize_type(&mut self, parent: &dyn fmt::Debug, ty: Ty<'tcx>) -> Ty<'tcx> {
- if ty.has_escaping_regions() || ty.references_error() {
+ if ty.has_escaping_bound_vars() || ty.references_error() {
span_mirbug_and_err!(self, parent, "bad type {:?}", ty)
} else {
ty
.enumerate()
.filter_map(|(idx, constraint)| {
let ty::OutlivesPredicate(k1, r2) =
- constraint.no_late_bound_regions().unwrap_or_else(|| {
- bug!("query_constraint {:?} contained bound regions", constraint,);
+ constraint.no_bound_vars().unwrap_or_else(|| {
+ bug!("query_constraint {:?} contained bound vars", constraint,);
});
match k1.unpack() {
trait_ty: Ty<'tcx>,
impl_ty: Ty<'tcx>,
output: &mut Vec<MonoItem<'tcx>>) {
- assert!(!trait_ty.needs_subst() && !trait_ty.has_escaping_regions() &&
- !impl_ty.needs_subst() && !impl_ty.has_escaping_regions());
+ assert!(!trait_ty.needs_subst() && !trait_ty.has_escaping_bound_vars() &&
+ !impl_ty.needs_subst() && !impl_ty.has_escaping_bound_vars());
if let ty::Dynamic(ref trait_ty, ..) = trait_ty.sty {
let poly_trait_ref = trait_ty.principal().with_self_ty(tcx, impl_ty);
- assert!(!poly_trait_ref.has_escaping_regions());
+ assert!(!poly_trait_ref.has_escaping_bound_vars());
// Walk all methods of the trait, including those of its supertraits
let methods = tcx.vtable_methods(poly_trait_ref);
// regions must appear in the argument
// listing.
let main_ret_ty = self.tcx.erase_regions(
- &main_ret_ty.no_late_bound_regions().unwrap(),
+ &main_ret_ty.no_bound_vars().unwrap(),
);
let start_instance = Instance::resolve(
self.push_type_params(substs, iter::empty(), output);
}
ty::Error |
+ ty::Bound(..) |
ty::Infer(_) |
ty::UnnormalizedProjection(..) |
ty::Projection(..) |
let param_env = gcx.param_env(def_id);
// Normalize the sig.
- let sig = gcx.fn_sig(def_id).no_late_bound_regions().expect("LBR in ADT constructor signature");
+ let sig = gcx.fn_sig(def_id)
+ .no_bound_vars()
+ .expect("LBR in ADT constructor signature");
let sig = gcx.normalize_erasing_regions(param_env, sig);
let (adt_def, substs) = match sig.output().sty {
{
let did = tcx.require_lang_item(lang_item);
let poly_sig = tcx.fn_sig(did);
- let sig = poly_sig.no_late_bound_regions().unwrap();
+ let sig = poly_sig.no_bound_vars().unwrap();
let lhs_ty = lhs.ty(local_decls, tcx);
let rhs_ty = rhs.ty(local_decls, tcx);
let place_ty = place.ty(local_decls, tcx).to_ty(tcx);
ty::GeneratorWitness(..) |
ty::UnnormalizedProjection(..) |
ty::Infer(..) |
+ ty::Bound(..) |
ty::Error => {
bug!("unexpected type {:?}", ty)
}
ty::UnnormalizedProjection(..) => bug!("only used with chalk-engine"),
- ty::Infer(..) | ty::Error => {
+ ty::Bound(..) | ty::Infer(..) | ty::Error => {
// By the time this code runs, all type variables ought to
// be fully resolved.
Err(NoSolution)
// From the full set of obligations, just filter down to the
// region relationships.
implied_bounds.extend(obligations.into_iter().flat_map(|obligation| {
- assert!(!obligation.has_escaping_regions());
+ assert!(!obligation.has_escaping_bound_vars());
match obligation.predicate {
ty::Predicate::Trait(..) |
ty::Predicate::Subtype(..) |
vec![]
}
- ty::Predicate::RegionOutlives(ref data) => match data.no_late_bound_regions() {
+ ty::Predicate::RegionOutlives(ref data) => match data.no_bound_vars() {
None => vec![],
Some(ty::OutlivesPredicate(r_a, r_b)) => {
vec![OutlivesBound::RegionSubRegion(r_b, r_a)]
}
},
- ty::Predicate::TypeOutlives(ref data) => match data.no_late_bound_regions() {
+ ty::Predicate::TypeOutlives(ref data) => match data.no_bound_vars() {
None => vec![],
Some(ty::OutlivesPredicate(ty_a, r_b)) => {
let ty_a = infcx.resolve_type_vars_if_possible(&ty_a);
ty::GeneratorWitness(..) |
ty::UnnormalizedProjection(..) |
ty::Infer(..) |
+ ty::Bound(..) |
ty::Error => {
bug!("unexpected type {:?}", ty);
}
self.region_bounds.iter().map(|&(region_bound, span)| {
// account for the binder being introduced below; no need to shift `param_ty`
// because, at present at least, it can only refer to early-bound regions
- let region_bound = tcx.mk_region(ty::fold::shift_region(*region_bound, 1));
+ let region_bound = ty::fold::shift_region(tcx, region_bound, 1);
let outlives = ty::OutlivesPredicate(param_ty, region_bound);
(ty::Binder::dummy(outlives).to_predicate(), span)
}).chain(
}
// Replace constructor type with constructed type for tuple struct patterns.
let pat_ty = pat_ty.fn_sig(tcx).output();
- let pat_ty = pat_ty.no_late_bound_regions().expect("expected fn type");
+ let pat_ty = pat_ty.no_bound_vars().expect("expected fn type");
self.demand_eqtype(pat.span, expected, pat_ty);
ty::Opaque(def_id, substs) => Some(PointerKind::OfOpaque(def_id, substs)),
ty::Param(ref p) => Some(PointerKind::OfParam(p)),
// Insufficient type information.
- ty::Infer(_) => None,
+ ty::Bound(..) | ty::Infer(_) => None,
ty::Bool | ty::Char | ty::Int(..) | ty::Uint(..) |
ty::Float(_) | ty::Array(..) | ty::GeneratorWitness(..) |
// Create a `PolyFnSig`. Note the oddity that late bound
// regions appearing free in `expected_sig` are now bound up
// in this binder we are creating.
- assert!(!expected_sig.sig.has_regions_bound_above(ty::INNERMOST));
+ assert!(!expected_sig.sig.has_vars_bound_above(ty::INNERMOST));
let bound_sig = ty::Binder::bind(self.tcx.mk_fn_sig(
expected_sig.sig.inputs().iter().cloned(),
expected_sig.sig.output(),
let mut structural_to_nomimal = FxHashMap::default();
let sig = tcx.fn_sig(def_id);
- let sig = sig.no_late_bound_regions().unwrap();
+ let sig = sig.no_bound_vars().unwrap();
if intr.inputs.len() != sig.inputs().len() {
span_err!(tcx.sess, it.span, E0444,
"platform-specific intrinsic has invalid number of \
value
}
};
- assert!(!bounds.has_escaping_regions());
+ assert!(!bounds.has_escaping_bound_vars());
let cause = traits::ObligationCause::misc(span, self.body_id);
obligations.extend(traits::predicates_for_generics(cause.clone(),
fn_sig,
substs);
- assert!(!substs.has_escaping_regions());
+ assert!(!substs.has_escaping_bound_vars());
// It is possible for type parameters or early-bound lifetimes
// to appear in the signature of `self`. The substitutions we
fn register_predicate(&self, obligation: traits::PredicateObligation<'tcx>) {
debug!("register_predicate({:?})", obligation);
- if obligation.has_escaping_regions() {
- span_bug!(obligation.cause.span, "escaping regions in predicate {:?}",
+ if obligation.has_escaping_bound_vars() {
+ span_bug!(obligation.cause.span, "escaping bound vars in predicate {:?}",
obligation);
}
self.fulfillment_cx
}
fn normalize_ty(&self, span: Span, ty: Ty<'tcx>) -> Ty<'tcx> {
- if ty.has_escaping_regions() {
+ if ty.has_escaping_bound_vars() {
ty // FIXME: normalization and escaping regions
} else {
self.normalize_associated_types_in(span, &ty)
cause: traits::ObligationCause<'tcx>,
predicates: &ty::InstantiatedPredicates<'tcx>)
{
- assert!(!predicates.has_escaping_regions());
+ assert!(!predicates.has_escaping_bound_vars());
debug!("add_obligations_for_parameters(predicates={:?})",
predicates);
}
},
);
- assert!(!substs.has_escaping_regions());
- assert!(!ty.has_escaping_regions());
+ assert!(!substs.has_escaping_bound_vars());
+ assert!(!ty.has_escaping_bound_vars());
// Write the "user substs" down first thing for later.
let hir_id = self.tcx.hir.node_to_hir_id(node_id);
let span = tcx.hir.span(impl_node_id);
let param_env = tcx.param_env(impl_did);
- assert!(!self_type.has_escaping_regions());
+ assert!(!self_type.has_escaping_bound_vars());
debug!("visit_implementation_of_copy: self_type={:?} (free)",
self_type);
let span = tcx.hir.span(impl_node_id);
let source = tcx.type_of(impl_did);
- assert!(!source.has_escaping_regions());
+ assert!(!source.has_escaping_bound_vars());
let target = {
let trait_ref = tcx.impl_trait_ref(impl_did).unwrap();
assert_eq!(trait_ref.def_id, dispatch_from_dyn_trait);
let span = gcx.hir.span(impl_node_id);
let param_env = gcx.param_env(impl_did);
- assert!(!source.has_escaping_regions());
+ assert!(!source.has_escaping_bound_vars());
let err_info = CoerceUnsizedInfo { custom_kind: None };
item_def_id: DefId,
poly_trait_ref: ty::PolyTraitRef<'tcx>,
) -> Ty<'tcx> {
- if let Some(trait_ref) = poly_trait_ref.no_late_bound_regions() {
+ if let Some(trait_ref) = poly_trait_ref.no_bound_vars() {
self.tcx().mk_projection(item_def_id, trait_ref.substs)
} else {
// no late-bound regions, we can just ignore the binder
RegionKind::ReEmpty
| RegionKind::ReErased
| RegionKind::ReClosureBound(..)
- | RegionKind::ReCanonical(..)
| RegionKind::ReScope(..)
| RegionKind::ReVar(..)
| RegionKind::RePlaceholder(..)
ty::UnnormalizedProjection(..) |
ty::GeneratorWitness(..) |
+ ty::Bound(..) |
ty::Infer(..) => {
bug!("unexpected type encountered in \
variance inference: {}",
// way early-bound regions do, so we skip them here.
}
- ty::ReCanonical(_) |
ty::ReFree(..) |
ty::ReClosureBound(..) |
ty::ReScope(..) |
ty::RePlaceholder(..) |
ty::ReEmpty |
ty::ReClosureBound(_) |
- ty::ReCanonical(_) |
ty::ReErased => None
}
}
ty::Closure(..) | ty::Generator(..) => Tuple(vec![]), // FIXME(pcwalton)
+ ty::Bound(..) => panic!("Bound"),
ty::UnnormalizedProjection(..) => panic!("UnnormalizedProjection"),
ty::GeneratorWitness(..) => panic!("GeneratorWitness"),
ty::Infer(..) => panic!("Infer"),
projects / rust.git / commitdiff