[clang] [clang][bytecode] Variadic ctors also start lifetime (PR #201113)

[Timm Baeder via cfe-commits]

https://github.com/tbaederr updated https://github.com/llvm/llvm-project/pull/201113

>From f8317229cfc70f79231d2090e30d9eee7cdda781 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timm=20B=C3=A4der?= <tbaeder at redhat.com>
Date: Tue, 2 Jun 2026 15:09:22 +0200
Subject: [PATCH] [clang][bytecode] Variadic ctors also start lifetime

This is the same thing we do in the non-variadic `Call()`.
---
 clang/lib/AST/ByteCode/Interp.cpp   |  3 ++-
 clang/test/AST/ByteCode/records.cpp | 13 +++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/clang/lib/AST/ByteCode/Interp.cpp b/clang/lib/AST/ByteCode/Interp.cpp
index 6bcebf3ee892b..0ea6de1742175 100644
--- a/clang/lib/AST/ByteCode/Interp.cpp
+++ b/clang/lib/AST/ByteCode/Interp.cpp
@@ -1747,7 +1747,8 @@ bool CallVar(InterpState &S, CodePtr OpPC, const Function *Func,
     if (!(S.Current->getFunction() &&
           S.Current->getFunction()->isLambdaStaticInvoker() &&
           Func->isLambdaCallOperator())) {
-      if (!CheckInvoke(S, OpPC, ThisPtr))
+      if (!CheckInvoke(S, OpPC, ThisPtr,
+                       Func->isConstructor() || Func->isDestructor()))
         return false;
     }
 
diff --git a/clang/test/AST/ByteCode/records.cpp b/clang/test/AST/ByteCode/records.cpp
index a9b8ac6b10bcb..b792b56563b2f 100644
--- a/clang/test/AST/ByteCode/records.cpp
+++ b/clang/test/AST/ByteCode/records.cpp
@@ -2031,3 +2031,16 @@ namespace StaticMemberRedecl {
   const int S::m = 10;
   static_assert(getM() == 10, "");
 }
+
+namespace VariadicCtorStartsLifetime {
+  struct S {
+    constexpr S(int, ...) {}
+  };
+  class C {
+  public:
+    S s;
+    constexpr C() : s(1,1) {}
+  };
+  /// Used to not start the lifetime of 's'.
+  constexpr C c;
+}