1 files changed, 28 insertions, 0 deletions
diff --git a/compiler/rustc_mir_transform/src/dump_mir.rs b/compiler/rustc_mir_transform/src/dump_mir.rs
new file mode 100644
index 000000000..6b995141a
--- /dev/null
+++ b/compiler/rustc_mir_transform/src/dump_mir.rs
@@ -0,0 +1,28 @@
+//! This pass just dumps MIR at a specified point.
+
+use std::borrow::Cow;
+use std::fs::File;
+use std::io;
+
+use crate::MirPass;
+use rustc_middle::mir::write_mir_pretty;
+use rustc_middle::mir::Body;
+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 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(())
+}