1 files changed, 24 insertions, 1 deletions
diff --git a/contrib/llvm/tools/clang/lib/AST/MicrosoftCXXABI.cpp b/contrib/llvm/tools/clang/lib/AST/MicrosoftCXXABI.cpp
index 87b7767..4de93bb 100644
--- a/contrib/llvm/tools/clang/lib/AST/MicrosoftCXXABI.cpp
+++ b/contrib/llvm/tools/clang/lib/AST/MicrosoftCXXABI.cpp
@@ -14,8 +14,10 @@
 
 #include "CXXABI.h"
 #include "clang/AST/ASTContext.h"
-#include "clang/AST/Type.h"
 #include "clang/AST/DeclCXX.h"
+#include "clang/AST/RecordLayout.h"
+#include "clang/AST/Type.h"
+#include "clang/Basic/TargetInfo.h"
 
 using namespace clang;
 
@@ -26,6 +28,27 @@ public:
   MicrosoftCXXABI(ASTContext &Ctx) : Context(Ctx) { }
 
   unsigned getMemberPointerSize(const MemberPointerType *MPT) const;
+
+  CallingConv getDefaultMethodCallConv() const {
+    if (Context.Target.getTriple().getArch() == llvm::Triple::x86)
+      return CC_X86ThisCall;
+    else
+      return CC_C;
+  }
+
+  bool isNearlyEmpty(const CXXRecordDecl *RD) const {
+    // FIXME: Audit the corners
+    if (!RD->isDynamicClass())
+      return false;
+
+    const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
+    
+    // In the Microsoft ABI, classes can have one or two vtable pointers.
+    CharUnits PointerSize = 
+      Context.toCharUnitsFromBits(Context.Target.getPointerWidth(0));
+    return Layout.getNonVirtualSize() == PointerSize ||
+      Layout.getNonVirtualSize() == PointerSize * 2;
+  }    
 };
 }