From f48f77239638b798cffa1f9595f6e659472b0b16 Mon Sep 17 00:00:00 2001
From: Tim Kientzle <tkientzle@apple.com>
Date: Wed, 29 Jan 2025 18:52:17 -0800
Subject: [PATCH 1/2] Test for #78981

**Without #78981**: This test triggers "Reflection section too small to contain next record"
errors, indicating that the field information is broken.

**With #78981**: This test runs to completion without triggering
the error message above.
---
 validation-test/Reflection/reflect_Cxx.swift | 59 ++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 validation-test/Reflection/reflect_Cxx.swift

diff --git a/validation-test/Reflection/reflect_Cxx.swift b/validation-test/Reflection/reflect_Cxx.swift
new file mode 100644
index 0000000000000..1d3248e94fa75
--- /dev/null
+++ b/validation-test/Reflection/reflect_Cxx.swift
@@ -0,0 +1,59 @@
+// RUN: %empty-directory(%t)
+// RUN: split-file %s %t
+// %target-clangxx -c %S/Inputs/Cxx/pimpl.cpp -I %S/Inputs/Cxx -o %t/pimpl.o
+// RUN: %target-build-swift -lswiftSwiftReflectionTest %t/reflect_Cxx.swift -I %t -cxx-interoperability-mode=default -o %t/reflect_Cxx
+// RUN: %target-codesign %t/reflect_Cxx
+
+// RUN: %target-run %target-swift-reflection-test %t/reflect_Cxx | tee /dev/stderr | %FileCheck %s
+
+// REQUIRES: reflection_test_support
+// REQUIRES: executable_test
+// UNSUPPORTED: use_os_stdlib
+// UNSUPPORTED: asan
+
+//--- module.modulemap
+
+module CxxStruct {
+  header "CxxStruct.h"
+  requires cplusplus
+  export *
+}
+
+//--- CxxStruct.h
+
+struct CxxStructA {
+private:
+  int i;
+};
+
+inline CxxStructA createCxxStructA() {
+  return CxxStructA();
+}
+
+//--- reflect_Cxx.swift
+
+import SwiftReflectionTest
+import CxxStruct
+
+// Trigger type metadata to be emitted by conforming C++ types to a Swift protocol.
+protocol MyProto {}
+extension CxxStructA : MyProto {}
+
+let a = createCxxStructA()
+reflect(any: a)
+
+// CHECK: Reflecting an existential.
+// CHECK-NEXT: Instance pointer in child address space: 0x{{[0-9a-fA-F]+}}
+// CHECK-NEXT: Type reference:
+// CHECK-NEXT: (struct __C.CxxStructA)
+
+// CHECK: Type info:
+// CHECK-NEXT: (builtin size=4 alignment=4 stride=4 num_extra_inhabitants=0 bitwise_takable=1)
+// CHECK-NEXT: Mangled name: $sSo10CxxStructAV
+// CHECK-NEXT: Demangled name: __C.CxxStructA
+
+// CHECK: Start of instance data: 0x{{[0-9a-fA-F]+}}
+
+doneReflecting()
+
+// CHECK: Done.

From bf624b14615d361a68ba681d12bec3578c615353 Mon Sep 17 00:00:00 2001
From: Tim Kientzle <tkientzle@apple.com>
Date: Thu, 30 Jan 2025 08:57:38 -0800
Subject: [PATCH 2/2] Fine-tune what environments should run this test

---
 validation-test/Reflection/reflect_Cxx.swift | 1 +
 1 file changed, 1 insertion(+)

diff --git a/validation-test/Reflection/reflect_Cxx.swift b/validation-test/Reflection/reflect_Cxx.swift
index 1d3248e94fa75..8eeca12a6083c 100644
--- a/validation-test/Reflection/reflect_Cxx.swift
+++ b/validation-test/Reflection/reflect_Cxx.swift
@@ -8,6 +8,7 @@
 
 // REQUIRES: reflection_test_support
 // REQUIRES: executable_test
+// UNSUPPORTED: back_deployment_runtime
 // UNSUPPORTED: use_os_stdlib
 // UNSUPPORTED: asan