From 8b6765fb563a5b03d128d8f53b9b3986128a3405 Mon Sep 17 00:00:00 2001
From: Anders Carlsson <andersca@mac.com>
Date: Thu, 18 Feb 2010 17:32:33 +0000
Subject: [PATCH] Fix another bug and add another class.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@96590 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/CGVtable.cpp                      | 12 +++++--
 .../CodeGenCXX/vtable-layout-abi-examples.cpp | 34 +++++++++++++++++++
 2 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/lib/CodeGen/CGVtable.cpp b/lib/CodeGen/CGVtable.cpp
index 176e9c3037..6ab6a60a92 100644
--- a/lib/CodeGen/CGVtable.cpp
+++ b/lib/CodeGen/CGVtable.cpp
@@ -1138,9 +1138,17 @@ void VtableBuilder::AddVCallOffsets(BaseSubobject Base) {
       const ASTRecordLayout &MostDerivedClassLayout =
         Context.getASTRecordLayout(MostDerivedClass);
       
-      // FIXME: We should not use / 8 here.
+      FinalOverriders::OverriderInfo Overrider = 
+        Overriders.getOverrider(Base, MD);
+
       Offset = 
-        -(int64_t)MostDerivedClassLayout.getVBaseClassOffset(VBaseDecl) / 8;
+        -(int64_t)MostDerivedClassLayout.getVBaseClassOffset(VBaseDecl);
+      
+      // The base offset should be relative to the final overrider.
+      Offset += Overrider.BaseOffset;
+
+      // FIXME: We should not use / 8 here.
+      Offset = Offset / 8;
     }
 
     VCallAndVBaseOffsets.push_back(VtableComponent::MakeVCallOffset(Offset));
diff --git a/test/CodeGenCXX/vtable-layout-abi-examples.cpp b/test/CodeGenCXX/vtable-layout-abi-examples.cpp
index 5dabe29a21..94e9cd3f11 100644
--- a/test/CodeGenCXX/vtable-layout-abi-examples.cpp
+++ b/test/CodeGenCXX/vtable-layout-abi-examples.cpp
@@ -71,4 +71,38 @@ struct C: public virtual A {
   int ic;
 };
 void C::g() {}
+
+// CHECK:      Vtable for 'Test1::D' (18 entries).
+// CHECK-NEXT:    0 | vbase_offset (32)
+// CHECK-NEXT:    1 | offset_to_top (0)
+// CHECK-NEXT:    2 | Test1::D RTTI
+// CHECK-NEXT:        -- (Test1::B, 0) vtable address --
+// CHECK-NEXT:        -- (Test1::D, 0) vtable address --
+// CHECK-NEXT:    3 | void Test1::B::f()
+// CHECK-NEXT:    4 | void Test1::D::h()
+// CHECK-NEXT:    5 | vbase_offset (16)
+// CHECK-NEXT:    6 | offset_to_top (-16)
+// CHECK-NEXT:    7 | Test1::D RTTI
+// CHECK-NEXT:        -- (Test1::C, 16) vtable address --
+// CHECK-NEXT:    8 | void Test1::C::g()
+// CHECK-NEXT:    9 | void Test1::D::h()
+// CHECK-NEXT:        [this adjustment: -16 non-virtual]
+// CHECK-NEXT:   10 | vcall_offset (-32)
+// CHECK-NEXT:   11 | vcall_offset (-16)
+// CHECK-NEXT:   12 | vcall_offset (-32)
+// CHECK-NEXT:   13 | offset_to_top (-32)
+// CHECK-NEXT:   14 | Test1::D RTTI
+// CHECK-NEXT:        -- (Test1::A, 32) vtable address --
+// CHECK-NEXT:   15 | void Test1::B::f()
+// CHECK-NEXT:        [this adjustment: 0 non-virtual, -24 vcall offset offset]
+// CHECK-NEXT:   16 | void Test1::C::g()
+// CHECK-NEXT:        [this adjustment: 0 non-virtual, -32 vcall offset offset]
+// CHECK-NEXT:   17 | void Test1::D::h()
+// CHECK-NEXT:        [this adjustment: 0 non-virtual, -40 vcall offset offset]
+struct D: public B, public C {
+  void h ();
+  int id;
+};
+void D::h() { }
+
 }
-- 
2.40.0