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use rustc::infer::NLLRegionVariableOrigin;
use std::io::{self, Write};
use super::{OutlivesConstraint, RegionInferenceContext};
const REGION_WIDTH: usize = 8;
impl<'tcx> RegionInferenceContext<'tcx> {
pub(crate) fn dump_mir(&self, 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 = format!("{:?}", region),
rw = REGION_WIDTH,
c = format!("{:?}", classification),
cw = 8,
ob = format!("{:?}", outlived_by)
)?;
}
}
writeln!(out, "|")?;
writeln!(out, "| Inferred Region Values")?;
for region in self.regions() {
writeln!(
out,
"| {r:rw$} | {ui:4?} | {v}",
r = format!("{:?}", 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(&mut |msg| writeln!(out, "| {}", msg))?;
Ok(())
}
fn for_each_constraint(
&self,
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.iter().collect();
constraints.sort();
for constraint in &constraints {
let OutlivesConstraint {
sup,
sub,
locations,
} = constraint;
with_msg(&format!(
"{:?}: {:?} due to {:?}",
sup,
sub,
locations,
))?;
}
Ok(())
}
}