[PATCH] D70931: [MS] Emit exported complete/vbase destructors

[Reid Kleckner via Phabricator via cfe-commits]

rnk created this revision.
rnk added a reviewer: hans.
Herald added a project: clang.

Fixes PR44205

I checked, and deleting destructors are not affected.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D70931

Files:
  clang/lib/CodeGen/MicrosoftCXXABI.cpp
  clang/test/CodeGenCXX/dllexport-dtor-thunks.cpp
  clang/test/CodeGenCXX/dllimport-dtor-thunks.cpp


Index: clang/test/CodeGenCXX/dllimport-dtor-thunks.cpp
===================================================================
--- clang/test/CodeGenCXX/dllimport-dtor-thunks.cpp
+++ clang/test/CodeGenCXX/dllimport-dtor-thunks.cpp
@@ -19,9 +19,9 @@
   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.
+// Virtually inherits from a non-dllimport base class. In this case, we can
+// expect the DLL to provide a definition of the complete dtor. See
+// dllexport-dtor-thunks.cpp.
 struct __declspec(dllimport) ImportVBaseOverrideVDtor
     : public virtual BaseClass {
   virtual ~ImportVBaseOverrideVDtor() {}
Index: clang/test/CodeGenCXX/dllexport-dtor-thunks.cpp
===================================================================
--- clang/test/CodeGenCXX/dllexport-dtor-thunks.cpp
+++ clang/test/CodeGenCXX/dllexport-dtor-thunks.cpp
@@ -1,5 +1,12 @@
 // RUN: %clang_cc1 -mconstructor-aliases -fms-extensions %s -emit-llvm -o - -triple x86_64-windows-msvc | FileCheck %s
 
+namespace test1 {
+struct A { ~A(); };
+struct __declspec(dllexport) B : virtual A { };
+// CHECK: define weak_odr dso_local dllexport void @"??1B at test1@@QEAA at XZ"
+// CHECK: define weak_odr dso_local dllexport void @"??_DB at test1@@QEAAXXZ"
+}
+
 struct __declspec(dllexport) A { virtual ~A(); };
 struct __declspec(dllexport) B { virtual ~B(); };
 struct __declspec(dllexport) C : A, B { virtual ~C(); };
Index: clang/lib/CodeGen/MicrosoftCXXABI.cpp
===================================================================
--- clang/lib/CodeGen/MicrosoftCXXABI.cpp
+++ clang/lib/CodeGen/MicrosoftCXXABI.cpp
@@ -1343,6 +1343,13 @@
   // The TU defining a dtor is only guaranteed to emit a base destructor.  All
   // other destructor variants are delegating thunks.
   CGM.EmitGlobal(GlobalDecl(D, Dtor_Base));
+
+  // If the class is dllexported, emit the complete (vbase) destructor wherever
+  // the base dtor is emitted.
+  // FIXME: To match MSVC, this should only be done when the class was
+  // dllexported inlines are being exported.
+  if (D->getParent()->getNumVBases() > 0 && D->hasAttr<DLLExportAttr>())
+    CGM.EmitGlobal(GlobalDecl(D, Dtor_Complete));
 }
 
 CharUnits


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