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use super::{OutlivesConstraint, RegionInferenceContext};
use crate::type_check::Locations;
use rustc_infer::infer::NllRegionVariableOrigin;
use rustc_middle::ty::TyCtxt;
use std::io::{self, Write};
const REGION_WIDTH: usize = 8;
impl<'tcx> RegionInferenceContext<'tcx> {
pub(crate) fn dump_mir(&self, tcx: TyCtxt<'tcx>, out: &mut dyn Write) -> io::Result<()> {
writeln!(out, "| Free Region Mapping")?;
for region in self.regions() {
if let NllRegionVariableOrigin::FreeRegion = self.definitions[region].origin {
let classification = self.universal_regions.region_classification(region).unwrap();
let outlived_by = self.universal_region_relations.regions_outlived_by(region);
writeln!(
out,
"| {r:rw$?} | {c:cw$?} | {ob:?}",
r = region,
rw = REGION_WIDTH,
c = classification,
cw = 8, ob = outlived_by
)?;
}
}
writeln!(out, "|")?;
writeln!(out, "| Inferred Region Values")?;
for region in self.regions() {
writeln!(
out,
"| {r:rw$?} | {ui:4?} | {v}",
r = region,
rw = REGION_WIDTH,
ui = self.region_universe(region),
v = self.region_value_str(region),
)?;
}
writeln!(out, "|")?;
writeln!(out, "| Inference Constraints")?;
self.for_each_constraint(tcx, &mut |msg| writeln!(out, "| {}", msg))?;
Ok(())
}
fn for_each_constraint(
&self,
tcx: TyCtxt<'tcx>,
with_msg: &mut dyn FnMut(&str) -> io::Result<()>,
) -> io::Result<()> {
for region in self.definitions.indices() {
let value = self.liveness_constraints.region_value_str(region);
if value != "{}" {
with_msg(&format!("{:?} live at {}", region, value))?;
}
}
let mut constraints: Vec<_> = self.constraints.outlives().iter().collect();
constraints.sort_by_key(|c| (c.sup, c.sub));
for constraint in &constraints {
let OutlivesConstraint { sup, sub, locations, category, span, variance_info: _ } =
constraint;
let (name, arg) = match locations {
Locations::All(span) => {
("All", tcx.sess.source_map().span_to_embeddable_string(*span))
}
Locations::Single(loc) => ("Single", format!("{:?}", loc)),
};
with_msg(&format!(
"{:?}: {:?} due to {:?} at {}({}) ({:?}",
sup, sub, category, name, arg, span
))?;
}
Ok(())
}
}