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use FxIndexSet for region_bound_pairs

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This commit is contained in:
lcnr 2022-07-25 18:31:13 +02:00
parent 2fdbf075cf
commit 2e796acf33
5 changed files with 37 additions and 35 deletions
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10
compiler/rustc_borrowck/src/type_check/constraint_conversion.rs
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@ -22,6 +22,16 @@ pub(crate) struct ConstraintConversion<'a, 'tcx> {
infcx: &'a InferCtxt<'a, 'tcx>,
tcx: TyCtxt<'tcx>,
universal_regions: &'a UniversalRegions<'tcx>,
/// Each RBP `GK: 'a` is assumed to be true. These encode
/// relationships like `T: 'a` that are added via implicit bounds
/// or the `param_env`.
///
/// Each region here is guaranteed to be a key in the `indices`
/// map. We use the "original" regions (i.e., the keys from the
/// map, and not the values) because the code in
/// `process_registered_region_obligations` has some special-cased
/// logic expecting to see (e.g.) `ReStatic`, and if we supplied
/// our special inference variable there, we would mess that up.
region_bound_pairs: &'a RegionBoundPairs<'tcx>,
implicit_region_bound: ty::Region<'tcx>,
param_env: ty::ParamEnv<'tcx>,

21
compiler/rustc_borrowck/src/type_check/free_region_relations.rs
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@ -2,6 +2,7 @@
use rustc_data_structures::transitive_relation::TransitiveRelation;
use rustc_infer::infer::canonical::QueryRegionConstraints;
use rustc_infer::infer::outlives;
use rustc_infer::infer::outlives::env::RegionBoundPairs;
use rustc_infer::infer::region_constraints::GenericKind;
use rustc_infer::infer::InferCtxt;
use rustc_middle::mir::ConstraintCategory;
@ -34,18 +35,6 @@ pub(crate) struct UniversalRegionRelations<'tcx> {
inverse_outlives: TransitiveRelation<RegionVid>,
}
/// Each RBP `('a, GK)` indicates that `GK: 'a` can be assumed to
/// be true. These encode relationships like `T: 'a` that are
/// added via implicit bounds.
///
/// Each region here is guaranteed to be a key in the `indices`
/// map. We use the "original" regions (i.e., the keys from the
/// map, and not the values) because the code in
/// `process_registered_region_obligations` has some special-cased
/// logic expecting to see (e.g.) `ReStatic`, and if we supplied
/// our special inference variable there, we would mess that up.
type RegionBoundPairs<'tcx> = Vec<(ty::Region<'tcx>, GenericKind<'tcx>)>;
/// As part of computing the free region relations, we also have to
/// normalize the input-output types, which we then need later. So we
/// return those. This vector consists of first the input types and
@ -71,7 +60,7 @@ pub(crate) fn create<'tcx>(
implicit_region_bound,
constraints,
universal_regions: universal_regions.clone(),
region_bound_pairs: Vec::new(),
region_bound_pairs: Default::default(),
relations: UniversalRegionRelations {
universal_regions: universal_regions.clone(),
outlives: Default::default(),
@ -371,11 +360,13 @@ fn add_outlives_bounds<I>(&mut self, outlives_bounds: I)
}
OutlivesBound::RegionSubParam(r_a, param_b) => {
self.region_bound_pairs.push((r_a, GenericKind::Param(param_b)));
self.region_bound_pairs
.insert(ty::OutlivesPredicate(GenericKind::Param(param_b), r_a));
}
OutlivesBound::RegionSubProjection(r_a, projection_b) => {
self.region_bound_pairs.push((r_a, GenericKind::Projection(projection_b)));
self.region_bound_pairs
.insert(ty::OutlivesPredicate(GenericKind::Projection(projection_b), r_a));
}
}
}

10
compiler/rustc_infer/src/infer/outlives/env.rs
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@ -1,6 +1,7 @@
use crate::infer::free_regions::FreeRegionMap;
use crate::infer::{GenericKind, InferCtxt};
use crate::traits::query::OutlivesBound;
use rustc_data_structures::fx::FxIndexSet;
use rustc_middle::ty::{self, ReEarlyBound, ReFree, ReVar, Region};
use super::explicit_outlives_bounds;
@ -53,7 +54,8 @@ pub struct OutlivesEnvironment<'tcx> {
/// "Region-bound pairs" tracks outlives relations that are known to
/// be true, either because of explicit where-clauses like `T: 'a` or
/// because of implied bounds.
pub type RegionBoundPairs<'tcx> = Vec<(Region<'tcx>, GenericKind<'tcx>)>;
pub type RegionBoundPairs<'tcx> =
FxIndexSet<ty::OutlivesPredicate<GenericKind<'tcx>, Region<'tcx>>>;
impl<'a, 'tcx> OutlivesEnvironment<'tcx> {
pub fn new(param_env: ty::ParamEnv<'tcx>) -> Self {
@ -97,10 +99,12 @@ pub fn add_outlives_bounds<I>(
debug!("add_outlives_bounds: outlives_bound={:?}", outlives_bound);
match outlives_bound {
OutlivesBound::RegionSubParam(r_a, param_b) => {
self.region_bound_pairs.push((r_a, GenericKind::Param(param_b)));
self.region_bound_pairs
.insert(ty::OutlivesPredicate(GenericKind::Param(param_b), r_a));
}
OutlivesBound::RegionSubProjection(r_a, projection_b) => {
self.region_bound_pairs.push((r_a, GenericKind::Projection(projection_b)));
self.region_bound_pairs
.insert(ty::OutlivesPredicate(GenericKind::Projection(projection_b), r_a));
}
OutlivesBound::RegionSubRegion(r_a, r_b) => {
if let (ReEarlyBound(_) | ReFree(_), ReVar(vid_b)) = (r_a.kind(), r_b.kind()) {

23
compiler/rustc_infer/src/infer/outlives/verify.rs
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@ -6,7 +6,7 @@
use rustc_data_structures::sso::SsoHashSet;
use rustc_hir::def_id::DefId;
use rustc_middle::ty::subst::{GenericArg, Subst};
use rustc_middle::ty::{self, EarlyBinder, Ty, TyCtxt};
use rustc_middle::ty::{self, EarlyBinder, OutlivesPredicate, Ty, TyCtxt};
use smallvec::smallvec;
@ -259,16 +259,17 @@ fn declared_generic_bounds_from_env_for_erased_ty(
// The problem is that the type of `x` is `&'a A`. To be
// well-formed, then, A must outlive `'a`, but we don't know that
// this holds from first principles.
let from_region_bound_pairs = self.region_bound_pairs.iter().filter_map(|&(r, p)| {
debug!(
"declared_generic_bounds_from_env_for_erased_ty: region_bound_pair = {:?}",
(r, p)
);
let p_ty = p.to_ty(tcx);
let erased_p_ty = self.tcx.erase_regions(p_ty);
(erased_p_ty == erased_ty)
.then_some(ty::Binder::dummy(ty::OutlivesPredicate(p.to_ty(tcx), r)))
});
let from_region_bound_pairs =
self.region_bound_pairs.iter().filter_map(|&OutlivesPredicate(p, r)| {
debug!(
"declared_generic_bounds_from_env_for_erased_ty: region_bound_pair = {:?}",
(r, p)
);
let p_ty = p.to_ty(tcx);
let erased_p_ty = self.tcx.erase_regions(p_ty);
(erased_p_ty == erased_ty)
.then_some(ty::Binder::dummy(ty::OutlivesPredicate(p.to_ty(tcx), r)))
});
param_bounds
.chain(from_region_bound_pairs)

8
compiler/rustc_typeck/src/check/wfcheck.rs
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@ -7,9 +7,8 @@
use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_hir::lang_items::LangItem;
use rustc_hir::ItemKind;
use rustc_infer::infer::outlives::env::OutlivesEnvironment;
use rustc_infer::infer::outlives::env::{OutlivesEnvironment, RegionBoundPairs};
use rustc_infer::infer::outlives::obligations::TypeOutlives;
use rustc_infer::infer::region_constraints::GenericKind;
use rustc_infer::infer::{self, InferCtxt, TyCtxtInferExt};
use rustc_infer::traits::Normalized;
use rustc_middle::ty::query::Providers;
@ -689,10 +688,7 @@ fn resolve_regions_with_wf_tys<'tcx>(
id: hir::HirId,
param_env: ty::ParamEnv<'tcx>,
wf_tys: &FxHashSet<Ty<'tcx>>,
add_constraints: impl for<'a> FnOnce(
&'a InferCtxt<'a, 'tcx>,
&'a Vec<(ty::Region<'tcx>, GenericKind<'tcx>)>,
),
add_constraints: impl for<'a> FnOnce(&'a InferCtxt<'a, 'tcx>, &'a RegionBoundPairs<'tcx>),
) -> bool {
// Unfortunately, we have to use a new `InferCtxt` each call, because
// region constraints get added and solved there and we need to test each