Let a portion of DefPathHash uniquely identify the DefPath's crate.

This allows to directly map from a DefPathHash to the crate it
originates from, without constructing side tables to do that mapping.

It also allows to reliably and cheaply check for DefPathHash collisions.

1 files changed, 4 insertions, 0 deletions

diff --git a/compiler/rustc_metadata/src/rmeta/decoder.rs b/compiler/rustc_metadata/src/rmeta/decoder.rs
index e3c35390798..e9b8388c1c9 100644
--- a/compiler/rustc_metadata/src/rmeta/decoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/decoder.rs
@@ -635,6 +635,10 @@ impl CrateRoot<'_> {
         self.hash
     }
 
+    crate fn stable_crate_id(&self) -> StableCrateId {
+        self.stable_crate_id
+    }
+
     crate fn triple(&self) -> &TargetTriple {
         &self.triple
     }