Reuse metadata file from work products.

3 files changed, 12 insertions, 1 deletions

diff --git a/compiler/rustc_middle/src/dep_graph/dep_node.rs b/compiler/rustc_middle/src/dep_graph/dep_node.rs
index 0c998a2cbb3..0c757a390ca 100644
--- a/compiler/rustc_middle/src/dep_graph/dep_node.rs
+++ b/compiler/rustc_middle/src/dep_graph/dep_node.rs
@@ -98,6 +98,7 @@ rustc_with_all_queries!(define_dep_nodes![
     [] fn TraitSelect() -> (),
     [] fn CompileCodegenUnit() -> (),
     [] fn CompileMonoItem() -> (),
+    [] fn Metadata() -> (),
 ]);
 
 // WARNING: `construct` is generic and does not know that `CompileCodegenUnit` takes `Symbol`s as keys.
@@ -115,6 +116,12 @@ pub(crate) fn make_compile_mono_item<'tcx>(
     DepNode::construct(tcx, dep_kinds::CompileMonoItem, mono_item)
 }
 
+// WARNING: `construct` is generic and does not know that `Metadata` takes `()`s as keys.
+// Be very careful changing this type signature!
+pub(crate) fn make_metadata(tcx: TyCtxt<'_>) -> DepNode {
+    DepNode::construct(tcx, dep_kinds::Metadata, &())
+}
+
 pub trait DepNodeExt: Sized {
     fn extract_def_id(&self, tcx: TyCtxt<'_>) -> Option<DefId>;
 
diff --git a/compiler/rustc_middle/src/dep_graph/mod.rs b/compiler/rustc_middle/src/dep_graph/mod.rs
index 0a8e6153817..781e3e442e6 100644
--- a/compiler/rustc_middle/src/dep_graph/mod.rs
+++ b/compiler/rustc_middle/src/dep_graph/mod.rs
@@ -9,7 +9,7 @@ use crate::ty::{self, TyCtxt};
 mod dep_node;
 
 pub use dep_node::{DepKind, DepNode, DepNodeExt, dep_kinds, label_strs};
-pub(crate) use dep_node::{make_compile_codegen_unit, make_compile_mono_item};
+pub(crate) use dep_node::{make_compile_codegen_unit, make_compile_mono_item, make_metadata};
 pub use rustc_query_system::dep_graph::debug::{DepNodeFilter, EdgeFilter};
 pub use rustc_query_system::dep_graph::{
     DepContext, DepGraphQuery, DepNodeIndex, Deps, SerializedDepGraph, SerializedDepNodeIndex,
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index 8aa50d14faa..e56f98291f1 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -3364,6 +3364,10 @@ impl<'tcx> TyCtxt<'tcx> {
         self.resolver_for_lowering_raw(()).0
     }
 
+    pub fn metadata_dep_node(self) -> crate::dep_graph::DepNode {
+        crate::dep_graph::make_metadata(self)
+    }
+
     /// Given an `impl_id`, return the trait it implements.
     /// Return `None` if this is an inherent impl.
     pub fn impl_trait_ref(