MS ABI: Properly call global delete when invoking virtual destructors

Summary:
The Itanium ABI approach of using offset-to-top isn't possible with the
MS ABI, it doesn't have that kind of information lying around.

Instead, we do the following:
- Call the virtual deleting destructor with the "don't delete the object
  flag" set.  The virtual deleting destructor will return a pointer to
  'this' adjusted to the most derived class.
- Call the global delete using the adjusted 'this' pointer.

Reviewers: rnk

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D5996

llvm-svn: 220993

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index 5faf2accebc..2c7783234b9 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -1136,6 +1136,9 @@ public:
   void pushLifetimeExtendedDestroy(CleanupKind kind, llvm::Value *addr,
                                    QualType type, Destroyer *destroyer,
                                    bool useEHCleanupForArray);
+  void pushCallObjectDeleteCleanup(const FunctionDecl *OperatorDelete,
+                                   llvm::Value *CompletePtr,
+                                   QualType ElementType);
   void pushStackRestore(CleanupKind kind, llvm::Value *SPMem);
   void emitDestroy(llvm::Value *addr, QualType type, Destroyer *destroyer,
                    bool useEHCleanupForArray);
@@ -2319,6 +2322,11 @@ public:
                               ReturnValueSlot ReturnValue, llvm::Value *This,
                               llvm::Value *ImplicitParam,
                               QualType ImplicitParamTy, const CallExpr *E);
+  RValue EmitCXXStructorCall(const CXXMethodDecl *MD, llvm::Value *Callee,
+                             ReturnValueSlot ReturnValue, llvm::Value *This,
+                             llvm::Value *ImplicitParam,
+                             QualType ImplicitParamTy, const CallExpr *E,
+                             StructorType Type);
   RValue EmitCXXMemberCallExpr(const CXXMemberCallExpr *E,
                                ReturnValueSlot ReturnValue);
   RValue EmitCXXMemberPointerCallExpr(const CXXMemberCallExpr *E,