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use rustc::ty::subst::Substs;
use rustc::ty::{self, CanonicalTy, ClosureSubsts, GeneratorInterior, Ty, TypeFoldable};
use rustc::mir::{BasicBlock, Local, Location, Mir, Statement, StatementKind};
use rustc::mir::visit::{MutVisitor, TyContext};
use rustc::infer::{InferCtxt, NLLRegionVariableOrigin};
pub fn renumber_mir<'tcx>(infcx: &InferCtxt<'_, '_, 'tcx>, mir: &mut Mir<'tcx>) {
debug!("renumber_mir()");
debug!("renumber_mir: mir.arg_count={:?}", mir.arg_count);
let mut visitor = NLLVisitor { infcx };
visitor.visit_mir(mir);
}
pub fn renumber_regions<'tcx, T>(
infcx: &InferCtxt<'_, '_, 'tcx>,
ty_context: TyContext,
value: &T,
) -> T
where
T: TypeFoldable<'tcx>,
{
debug!("renumber_regions(value={:?})", value);
infcx
.tcx
.fold_regions(value, &mut false, |_region, _depth| {
let origin = NLLRegionVariableOrigin::Inferred(ty_context);
infcx.next_nll_region_var(origin)
})
}
struct NLLVisitor<'a, 'gcx: 'a + 'tcx, 'tcx: 'a> {
infcx: &'a InferCtxt<'a, 'gcx, 'tcx>,
}
impl<'a, 'gcx, 'tcx> NLLVisitor<'a, 'gcx, 'tcx> {
fn renumber_regions<T>(&mut self, ty_context: TyContext, value: &T) -> T
where
T: TypeFoldable<'tcx>,
{
renumber_regions(self.infcx, ty_context, value)
}
}
impl<'a, 'gcx, 'tcx> MutVisitor<'tcx> for NLLVisitor<'a, 'gcx, 'tcx> {
fn visit_ty(&mut self, ty: &mut Ty<'tcx>, ty_context: TyContext) {
debug!("visit_ty(ty={:?}, ty_context={:?})", ty, ty_context);
*ty = self.renumber_regions(ty_context, ty);
debug!("visit_ty: ty={:?}", ty);
}
fn visit_substs(&mut self, substs: &mut &'tcx Substs<'tcx>, location: Location) {
debug!("visit_substs(substs={:?}, location={:?})", substs, location);
let ty_context = TyContext::Location(location);
*substs = self.renumber_regions(ty_context, &{ *substs });
debug!("visit_substs: substs={:?}", substs);
}
fn visit_region(&mut self, region: &mut ty::Region<'tcx>, location: Location) {
debug!("visit_region(region={:?}, location={:?})", region, location);
let old_region = *region;
let ty_context = TyContext::Location(location);
*region = self.renumber_regions(ty_context, &old_region);
debug!("visit_region: region={:?}", region);
}
fn visit_const(&mut self, constant: &mut &'tcx ty::Const<'tcx>, location: Location) {
let ty_context = TyContext::Location(location);
*constant = self.renumber_regions(ty_context, &*constant);
}
fn visit_generator_interior(&mut self,
interior: &mut GeneratorInterior<'tcx>,
location: Location) {
debug!(
"visit_generator_interior(interior={:?}, location={:?})",
interior,
location,
);
let ty_context = TyContext::Location(location);
*interior = self.renumber_regions(ty_context, interior);
debug!("visit_generator_interior: interior={:?}", interior);
}
fn visit_closure_substs(&mut self, substs: &mut ClosureSubsts<'tcx>, location: Location) {
debug!(
"visit_closure_substs(substs={:?}, location={:?})",
substs,
location
);
let ty_context = TyContext::Location(location);
*substs = self.renumber_regions(ty_context, substs);
debug!("visit_closure_substs: substs={:?}", substs);
}
fn visit_user_assert_ty(&mut self, _c_ty: &mut CanonicalTy<'tcx>, _local: &mut Local,
_location: Location) {
debug!("visit_user_assert_ty: skipping renumber");
}
fn visit_statement(
&mut self,
block: BasicBlock,
statement: &mut Statement<'tcx>,
location: Location,
) {
if let StatementKind::EndRegion(_) = statement.kind {
statement.kind = StatementKind::Nop;
}
self.super_statement(block, statement, location);
}
}