[dllimport] Check for dtor references in functions

Destructor references are not modelled explicitly in the AST. This adds
checks for destructor calls due to variable definitions and temporaries.

If a dllimport function references a non-dllimport destructor, it must
not be emitted available_externally, as the referenced destructor might
live across the DLL boundary and isn't exported.

llvm-svn: 295258

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/test/CodeGenCXX/dllimport.cpp b/clang/test/CodeGenCXX/dllimport.cpp
index 731239e5eda..372a96ba2ef 100644
--- a/clang/test/CodeGenCXX/dllimport.cpp
+++ b/clang/test/CodeGenCXX/dllimport.cpp
@@ -368,6 +368,13 @@ struct ClassWithCtor { ClassWithCtor() {} };
 struct __declspec(dllimport) ClassWithNonDllImportFieldWithCtor { ClassWithCtor t; };
 USECLASS(ClassWithNonDllImportFieldWithCtor);
 // MO1-DAG: declare dllimport x86_thiscallcc %struct.ClassWithNonDllImportFieldWithCtor* @"\01??0ClassWithNonDllImportFieldWithCtor@@QAE@XZ"(%struct.ClassWithNonDllImportFieldWithCtor* returned)
+struct ClassWithImplicitDtor { __declspec(dllimport) ClassWithImplicitDtor(); ClassWithDtor member; };
+__declspec(dllimport) inline void ReferencingDtorThroughDefinition() { ClassWithImplicitDtor x; };
+USE(ReferencingDtorThroughDefinition)
+// MO1-DAG: declare dllimport void @"\01?ReferencingDtorThroughDefinition@@YAXXZ"()
+__declspec(dllimport) inline void ReferencingDtorThroughTemporary() { ClassWithImplicitDtor(); };
+USE(ReferencingDtorThroughTemporary)
+// MO1-DAG: declare dllimport void @"\01?ReferencingDtorThroughTemporary@@YAXXZ"()
 
 // A dllimport function with a TLS variable must not be available_externally.
 __declspec(dllimport) inline void FunctionWithTLSVar() { static __thread int x = 42; }