diff --git a/cranelift/codegen/meta/src/default_map.rs b/cranelift/codegen/meta/src/default_map.rs
new file mode 100644
index 0000000000..da6d471439
--- /dev/null
+++ b/cranelift/codegen/meta/src/default_map.rs
@@ -0,0 +1,19 @@
+use std::collections::HashMap;
+use std::hash::Hash;
+
+pub trait MapWithDefault<K, V: Default> {
+    fn get_or_default(&mut self, k: K) -> &mut V;
+}
+
+impl<K: Eq + Hash, V: Default> MapWithDefault<K, V> for HashMap<K, V> {
+    fn get_or_default(&mut self, k: K) -> &mut V {
+        self.entry(k).or_insert_with(|| V::default())
+    }
+}
+
+#[test]
+fn test_default() {
+    let mut hash_map = HashMap::new();
+    hash_map.insert(42, "hello");
+    assert_eq!(*hash_map.get_or_default(43), "");
+}
diff --git a/cranelift/codegen/meta/src/lib.rs b/cranelift/codegen/meta/src/lib.rs
index af8e51bb9d..901f640a51 100644
--- a/cranelift/codegen/meta/src/lib.rs
+++ b/cranelift/codegen/meta/src/lib.rs
@@ -12,6 +12,7 @@ mod gen_settings;
 mod gen_types;
 
 mod constant_hash;
+mod default_map;
 mod shared;
 mod unique_table;