84 lines
2.4 KiB
Rust
84 lines
2.4 KiB
Rust
use rustc_index::vec::IndexVec;
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use rustc_infer::infer::{InferCtxt, NllRegionVariableOrigin};
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use rustc_middle::mir::visit::{MutVisitor, TyContext};
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use rustc_middle::mir::{Body, Location, Promoted};
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use rustc_middle::ty::subst::SubstsRef;
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use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable};
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/// Replaces all free regions appearing in the MIR with fresh
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/// inference variables, returning the number of variables created.
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#[instrument(skip(infcx, body, promoted), level = "debug")]
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pub fn renumber_mir<'tcx>(
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infcx: &InferCtxt<'_, 'tcx>,
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body: &mut Body<'tcx>,
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promoted: &mut IndexVec<Promoted, Body<'tcx>>,
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) {
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debug!(?body.arg_count);
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let mut visitor = NllVisitor { infcx };
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for body in promoted.iter_mut() {
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visitor.visit_body(body);
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}
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visitor.visit_body(body);
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}
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/// Replaces all regions appearing in `value` with fresh inference
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/// variables.
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#[instrument(skip(infcx), level = "debug")]
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pub fn renumber_regions<'tcx, T>(infcx: &InferCtxt<'_, 'tcx>, value: T) -> T
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where
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T: TypeFoldable<'tcx>,
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{
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infcx.tcx.fold_regions(value, |_region, _depth| {
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let origin = NllRegionVariableOrigin::Existential { from_forall: false };
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infcx.next_nll_region_var(origin)
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})
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}
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struct NllVisitor<'a, 'tcx> {
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infcx: &'a InferCtxt<'a, 'tcx>,
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}
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impl<'a, 'tcx> NllVisitor<'a, 'tcx> {
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fn renumber_regions<T>(&mut self, value: T) -> T
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where
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T: TypeFoldable<'tcx>,
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{
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renumber_regions(self.infcx, value)
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}
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}
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impl<'a, 'tcx> MutVisitor<'tcx> for NllVisitor<'a, 'tcx> {
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fn tcx(&self) -> TyCtxt<'tcx> {
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self.infcx.tcx
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}
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#[instrument(skip(self), level = "debug")]
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fn visit_ty(&mut self, ty: &mut Ty<'tcx>, ty_context: TyContext) {
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*ty = self.renumber_regions(*ty);
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debug!(?ty);
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}
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#[instrument(skip(self), level = "debug")]
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fn visit_substs(&mut self, substs: &mut SubstsRef<'tcx>, location: Location) {
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*substs = self.renumber_regions(*substs);
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debug!(?substs);
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}
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#[instrument(skip(self), level = "debug")]
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fn visit_region(&mut self, region: &mut ty::Region<'tcx>, location: Location) {
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let old_region = *region;
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*region = self.renumber_regions(old_region);
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debug!(?region);
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}
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fn visit_const(&mut self, constant: &mut ty::Const<'tcx>, _location: Location) {
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*constant = self.renumber_regions(*constant);
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}
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}
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