Vendor import of clang trunk r126079:

http://llvm.org/svn/llvm-project/cfe/trunk@126079

1 files changed, 21 insertions, 0 deletions

diff --git a/lib/AST/ItaniumCXXABI.cpp b/lib/AST/ItaniumCXXABI.cpp
index c3fa466..bed02b4 100644
--- a/lib/AST/ItaniumCXXABI.cpp
+++ b/lib/AST/ItaniumCXXABI.cpp
@@ -19,7 +19,10 @@
 
 #include "CXXABI.h"
 #include "clang/AST/ASTContext.h"
+#include "clang/AST/RecordLayout.h"
+#include "clang/AST/DeclCXX.h"
 #include "clang/AST/Type.h"
+#include "clang/Basic/TargetInfo.h"
 
 using namespace clang;
 
@@ -35,6 +38,24 @@ public:
     if (Pointee->isFunctionType()) return 2;
     return 1;
   }
+
+  CallingConv getDefaultMethodCallConv() const {
+    return CC_C;
+  }
+
+  // We cheat and just check that the class has a vtable pointer, and that it's
+  // only big enough to have a vtable pointer and nothing more (or less).
+  bool isNearlyEmpty(const CXXRecordDecl *RD) const {
+
+    // Check that the class has a vtable pointer.
+    if (!RD->isDynamicClass())
+      return false;
+
+    const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD);
+    CharUnits PointerSize = 
+      Context.toCharUnitsFromBits(Context.Target.getPointerWidth(0));
+    return Layout.getNonVirtualSize() == PointerSize;
+  }
 };
 
 class ARMCXXABI : public ItaniumCXXABI {