From 984246ca6ac62d27dd4d6a4945b2c83920d0913b Mon Sep 17 00:00:00 2001
From: Ryan McConnell <rammcconnell@gmail.com>
Date: Mon, 1 Jun 2026 12:05:35 -0400
Subject: [PATCH] init

---
 compiler/vtables.nim                |  2 ++
 tests/method/mvtables_reentry_a.nim |  5 +++++
 tests/method/mvtables_reentry_b.nim |  7 +++++++
 tests/method/tvtable_reentry.nim    | 19 +++++++++++++++++++
 4 files changed, 33 insertions(+)
 create mode 100644 tests/method/mvtables_reentry_a.nim
 create mode 100644 tests/method/mvtables_reentry_b.nim
 create mode 100644 tests/method/tvtable_reentry.nim

diff --git a/compiler/vtables.nim b/compiler/vtables.nim
index 9274aa103e7c4..5b05daa868328 100644
--- a/compiler/vtables.nim
+++ b/compiler/vtables.nim
@@ -152,6 +152,8 @@ proc sortVTableDispatchers*(g: ModuleGraph) =
         rootItemIdCount.inc(baseType.itemId)
       for idx in 0..<g.methods[bucket].methods.len:
         let obj = g.methods[bucket].methods[idx].typ.firstParamType.skipTypes(skipPtrs)
+        if obj.itemId notin itemTable:
+          itemTable[obj.itemId] = newSeq[PSym](methodIndexLen)
         itemTable[obj.itemId][mIndex] = g.methods[bucket].methods[idx]
 
   for baseType in rootTypeSeq:
diff --git a/tests/method/mvtables_reentry_a.nim b/tests/method/mvtables_reentry_a.nim
new file mode 100644
index 0000000000000..b9d297c781db7
--- /dev/null
+++ b/tests/method/mvtables_reentry_a.nim
@@ -0,0 +1,5 @@
+type
+  VtableBaseA* = ref object of RootObj
+
+method say*(a: VtableBaseA): string {.base.} =
+  "base"
diff --git a/tests/method/mvtables_reentry_b.nim b/tests/method/mvtables_reentry_b.nim
new file mode 100644
index 0000000000000..2a716b2d9cf5c
--- /dev/null
+++ b/tests/method/mvtables_reentry_b.nim
@@ -0,0 +1,7 @@
+import mvtables_reentry_a
+
+type
+  VtableDerivedB* = ref object of VtableBaseA
+
+method say*(d: VtableDerivedB): string =
+  "derived"
diff --git a/tests/method/tvtable_reentry.nim b/tests/method/tvtable_reentry.nim
new file mode 100644
index 0000000000000..41109ba879c2a
--- /dev/null
+++ b/tests/method/tvtable_reentry.nim
@@ -0,0 +1,19 @@
+discard """
+  targets: "c cpp"
+"""
+
+import mvtables_reentry_a
+
+type
+  MainType = ref object of VtableBaseA
+
+method say*(m: MainType): string =
+  "main"
+
+when isMainModule:
+  import mvtables_reentry_b
+
+  let a: VtableBaseA = VtableDerivedB()
+  doAssert a.say() == "derived"
+  let m: VtableBaseA = MainType()
+  doAssert m.say() == "main"