--- /dev/null
+//! This pass just dumps MIR at a specified point.
+
+use std::borrow::Cow;
+use std::fmt;
+use std::fs::File;
+use std::io;
+
+use crate::MirPass;
+use rustc_middle::mir::Body;
+use rustc_middle::mir::{dump_enabled, dump_mir, write_mir_pretty};
+use rustc_middle::ty::TyCtxt;
+use rustc_session::config::{OutputFilenames, OutputType};
+
+pub struct Marker(pub &'static str);
+
+impl<'tcx> MirPass<'tcx> for Marker {
+ fn name(&self) -> Cow<'_, str> {
+ Cow::Borrowed(self.0)
+ }
+
+ fn run_pass(&self, _tcx: TyCtxt<'tcx>, _body: &mut Body<'tcx>) {}
+}
+
+pub struct Disambiguator {
+ is_after: bool,
+}
+
+impl fmt::Display for Disambiguator {
+ fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let title = if self.is_after { "after" } else { "before" };
+ write!(formatter, "{}", title)
+ }
+}
+
+pub fn on_mir_pass<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ pass_num: &dyn fmt::Display,
+ pass_name: &str,
+ body: &Body<'tcx>,
+ is_after: bool,
+) {
+ if dump_enabled(tcx, pass_name, body.source.def_id()) {
+ dump_mir(tcx, Some(pass_num), pass_name, &Disambiguator { is_after }, body, |_, _| Ok(()));
+ }
+}
+
+pub fn emit_mir(tcx: TyCtxt<'_>, outputs: &OutputFilenames) -> io::Result<()> {
+ let path = outputs.path(OutputType::Mir);
+ let mut f = io::BufWriter::new(File::create(&path)?);
+ write_mir_pretty(tcx, None, &mut f)?;
+ Ok(())
+}