Refactor to make interpreter and codegen backend neutral to vtable internal representation.

2 files changed, 19 insertions, 3 deletions

diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index 0860520ef9d..a6f9a7c96f0 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -959,9 +959,9 @@ rustc_queries! {
         desc { |tcx| "checking if item has mir available: `{}`", tcx.def_path_str(key) }
     }
 
-    query vtable_methods(key: ty::PolyTraitRef<'tcx>)
-                        -> &'tcx [Option<(DefId, SubstsRef<'tcx>)>] {
-        desc { |tcx| "finding all methods for trait {}", tcx.def_path_str(key.def_id()) }
+    query vtable_entries(key: ty::PolyTraitRef<'tcx>)
+                        -> &'tcx [ty::VtblEntry<'tcx>] {
+        desc { |tcx| "finding all vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
     }
 
     query codegen_fulfill_obligation(
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index 227aa8dc284..a2abbec7492 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -2009,3 +2009,19 @@ impl<'tcx> fmt::Debug for SymbolName<'tcx> {
         fmt::Display::fmt(&self.name, fmt)
     }
 }
+
+#[derive(Clone, Copy, Debug, PartialEq, HashStable)]
+pub enum VtblEntry<'tcx> {
+    MetadataDropInPlace,
+    MetadataSize,
+    MetadataAlign,
+    Vacant,
+    Method(DefId, SubstsRef<'tcx>),
+}
+
+pub const COMMON_VTABLE_ENTRIES: &[VtblEntry<'_>] =
+    &[VtblEntry::MetadataDropInPlace, VtblEntry::MetadataSize, VtblEntry::MetadataAlign];
+
+pub const COMMON_VTABLE_ENTRIES_DROPINPLACE: usize = 0;
+pub const COMMON_VTABLE_ENTRIES_SIZE: usize = 1;
+pub const COMMON_VTABLE_ENTRIES_ALIGN: usize = 2;