1 files changed, 49 insertions, 0 deletions
diff --git a/test/CodeGenCXX/dllimport-dtor-thunks.cpp b/test/CodeGenCXX/dllimport-dtor-thunks.cpp
new file mode 100644
index 000000000000..b381fff450da
--- /dev/null
+++ b/test/CodeGenCXX/dllimport-dtor-thunks.cpp
@@ -0,0 +1,49 @@
+// RUN: %clang_cc1 -mconstructor-aliases %s -triple x86_64-windows-msvc -fms-extensions -emit-llvm -o - | FileCheck %s
+
+// FIXME: We should really consider removing -mconstructor-aliases for MS C++
+// ABI. The risk of bugs introducing ABI incompatibility under
+// -mno-constructor-aliases is too high.
+
+// PR32990
+
+// Introduces the virtual destructor. We should use the base destructor
+// directly, no thunk needed.
+struct __declspec(dllimport) ImportIntroVDtor {
+  virtual ~ImportIntroVDtor() {}
+};
+
+struct BaseClass {
+  virtual ~BaseClass() {}
+};
+
+// Non-virtually inherits from a non-dllimport base class. We should again call
+// the derived base constructor directly. No need for the complete (aka vbase)
+// destructor.
+struct __declspec(dllimport) ImportOverrideVDtor : public BaseClass {
+  virtual ~ImportOverrideVDtor() {}
+};
+
+// Virtually inherits from a non-dllimport base class. This time we need to call
+// the complete destructor and emit it inline. It's not exported from the DLL,
+// and it must be emitted.
+struct __declspec(dllimport) ImportVBaseOverrideVDtor
+    : public virtual BaseClass {
+  virtual ~ImportVBaseOverrideVDtor() {}
+};
+
+extern "C" void testit() {
+  ImportIntroVDtor t1;
+  ImportOverrideVDtor t2;
+  ImportVBaseOverrideVDtor t3;
+}
+
+// The destructors are called in reverse order of construction. Only the third
+// needs the complete destructor (_D).
+// CHECK-LABEL: define void @testit()
+// CHECK:  call void @"\01??_DImportVBaseOverrideVDtor@@QEAAXXZ"(%struct.ImportVBaseOverrideVDtor* %{{.*}})
+// CHECK:  call void @"\01??1ImportOverrideVDtor@@UEAA@XZ"(%struct.ImportOverrideVDtor* %{{.*}})
+// CHECK:  call void @"\01??1ImportIntroVDtor@@UEAA@XZ"(%struct.ImportIntroVDtor* %{{.*}})
+
+// CHECK-LABEL: define linkonce_odr void @"\01??_DImportVBaseOverrideVDtor@@QEAAXXZ"
+// CHECK-LABEL: declare dllimport void @"\01??1ImportOverrideVDtor@@UEAA@XZ"
+// CHECK-LABEL: declare dllimport void @"\01??1ImportIntroVDtor@@UEAA@XZ"