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use borrow_check::nll::region_infer::RegionInferenceContext;
use borrow_check::nll::ToRegionVid;
use rustc::mir::{Local, Mir};
use rustc::ty::{RegionVid, TyCtxt};
use rustc_data_structures::indexed_vec::Idx;
use syntax::source_map::Span;
use syntax_pos::symbol::Symbol;
impl<'tcx> RegionInferenceContext<'tcx> {
crate fn get_var_name_and_span_for_region(
&self,
tcx: TyCtxt<'_, '_, 'tcx>,
mir: &Mir<'tcx>,
fr: RegionVid,
) -> Option<(Option<Symbol>, Span)> {
debug!("get_var_name_and_span_for_region(fr={:?})", fr);
assert!(self.universal_regions.is_universal_region(fr));
debug!("get_var_name_and_span_for_region: attempting upvar");
self.get_upvar_index_for_region(tcx, fr)
.map(|index| {
let (name, span) = self.get_upvar_name_and_span_for_region(tcx, mir, index);
(Some(name), span)
})
.or_else(|| {
debug!("get_var_name_and_span_for_region: attempting argument");
self.get_argument_index_for_region(tcx, fr)
.map(|index| self.get_argument_name_and_span_for_region(mir, index))
})
}
crate fn get_upvar_index_for_region(
&self,
tcx: TyCtxt<'_, '_, 'tcx>,
fr: RegionVid,
) -> Option<usize> {
let upvar_index = self
.universal_regions
.defining_ty
.upvar_tys(tcx)
.position(|upvar_ty| {
debug!(
"get_upvar_index_for_region: upvar_ty = {:?}",
upvar_ty,
);
tcx.any_free_region_meets(&upvar_ty, |r| r.to_region_vid() == fr)
})?;
let upvar_ty = self
.universal_regions
.defining_ty
.upvar_tys(tcx)
.nth(upvar_index);
debug!(
"get_upvar_index_for_region: found {:?} in upvar {} which has type {:?}",
fr, upvar_index, upvar_ty,
);
Some(upvar_index)
}
crate fn get_upvar_name_and_span_for_region(
&self,
tcx: TyCtxt<'_, '_, 'tcx>,
mir: &Mir<'tcx>,
upvar_index: usize,
) -> (Symbol, Span) {
let upvar_hir_id = mir.upvar_decls[upvar_index].var_hir_id.assert_crate_local();
let upvar_node_id = tcx.hir.hir_to_node_id(upvar_hir_id);
debug!("get_upvar_name_and_span_for_region: upvar_node_id={:?}", upvar_node_id);
let upvar_name = tcx.hir.name(upvar_node_id);
let upvar_span = tcx.hir.span(upvar_node_id);
debug!("get_upvar_name_and_span_for_region: upvar_name={:?} upvar_span={:?}",
upvar_name, upvar_span);
(upvar_name, upvar_span)
}
crate fn get_argument_index_for_region(
&self,
tcx: TyCtxt<'_, '_, 'tcx>,
fr: RegionVid,
) -> Option<usize> {
let implicit_inputs = self.universal_regions.defining_ty.implicit_inputs();
let argument_index = self
.universal_regions
.unnormalized_input_tys
.iter()
.skip(implicit_inputs)
.position(|arg_ty| {
debug!(
"get_argument_index_for_region: arg_ty = {:?}",
arg_ty
);
tcx.any_free_region_meets(arg_ty, |r| r.to_region_vid() == fr)
})?;
debug!(
"get_argument_index_for_region: found {:?} in argument {} which has type {:?}",
fr, argument_index, self.universal_regions.unnormalized_input_tys[argument_index],
);
Some(argument_index)
}
crate fn get_argument_name_and_span_for_region(
&self,
mir: &Mir<'tcx>,
argument_index: usize,
) -> (Option<Symbol>, Span) {
let implicit_inputs = self.universal_regions.defining_ty.implicit_inputs();
let argument_local = Local::new(implicit_inputs + argument_index + 1);
debug!("get_argument_name_and_span_for_region: argument_local={:?}", argument_local);
let argument_name = mir.local_decls[argument_local].name;
let argument_span = mir.local_decls[argument_local].source_info.span;
debug!("get_argument_name_and_span_for_region: argument_name={:?} argument_span={:?}",
argument_name, argument_span);
(argument_name, argument_span)
}
}