Enable users to dump the body of an instance

compiler/stable_mir/src/mir/body.rs

@@ -91,7 +91,8 @@ impl Body {
  self.locals.iter().enumerate()
  }
 
- pub(crate) fn dump<W: io::Write>(&self, w: &mut W, fn_name: &str) -> io::Result<()> {
+ /// Emit the body using the provided name for the signature.
+ pub fn dump<W: io::Write>(&self, w: &mut W, fn_name: &str) -> io::Result<()> {
  function_body(w, self, fn_name)
  }
 

compiler/stable_mir/src/mir/mono.rs

@@ -4,6 +4,7 @@ use crate::mir::Body;
 use crate::ty::{Allocation, ClosureDef, ClosureKind, FnDef, GenericArgs, IndexedVal, Ty};
 use crate::{with, CrateItem, DefId, Error, ItemKind, Opaque, Symbol};
 use std::fmt::{Debug, Formatter};
+use std::io;
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub enum MonoItem {
@@ -157,6 +158,11 @@ impl Instance {
  pub fn try_const_eval(&self, const_ty: Ty) -> Result<Allocation, Error> {
  with(|cx| cx.eval_instance(self.def, const_ty))
  }
+
+ /// Emit the body of this instance if it has one.
+ pub fn emit_mir<W: io::Write>(&self, w: &mut W) -> io::Result<()> {
+ if let Some(body) = self.body() { body.dump(w, &self.name()) } else { Ok(()) }
+ }
 }
 
 impl Debug for Instance {