Add a much more thorough test of casts to virtual bases, and fix

GetCXXBaseClassOffset to actually pass the test.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@90025 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 31 insertions, 7 deletions

diff --git a/test/CodeGenCXX/virtual-base-cast.cpp b/test/CodeGenCXX/virtual-base-cast.cpp
index a825120ad2..eae868f9b6 100644
--- a/test/CodeGenCXX/virtual-base-cast.cpp
+++ b/test/CodeGenCXX/virtual-base-cast.cpp
@@ -1,9 +1,33 @@
-// RUN: clang-cc -emit-llvm-only %s
+// RUN: clang-cc -emit-llvm %s -o - -triple i686-pc-linux-gnu | FileCheck %s
 
-struct A { virtual ~A(); };
-struct B : A { virtual ~B(); };
-struct C : virtual B { virtual ~C(); };
+struct A { int a; virtual int aa(); };
+struct B { int b; virtual int bb(); };
+struct C : virtual A, virtual B { int c; virtual int aa(); virtual int bb(); };
+struct AA { int a; virtual int aa(); };
+struct BB { int b; virtual int bb(); };
+struct CC : AA, BB { virtual int aa(); virtual int bb(); virtual int cc(); };
+struct D : virtual C, virtual CC { int e; };
 
-void f(C *c) {
-  A* a = c;
-}
+D* x;
+
+A* a() { return x; }
+// CHECK: @_Z1av() nounwind
+// CHECK: [[VBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = getelementptr i8* {{.*}}, i64 -16
+// CHECK: [[CASTVBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = bitcast i8* [[VBASEOFFSETPTRA]] to i32*
+// CHECK: load i32* [[CASTVBASEOFFSETPTRA]]
+// CHECK: }
+
+B* b() { return x; }
+// CHECK: @_Z1bv() nounwind
+// CHECK: [[VBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = getelementptr i8* {{.*}}, i64 -20
+// CHECK: [[CASTVBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = bitcast i8* [[VBASEOFFSETPTRA]] to i32*
+// CHECK: load i32* [[CASTVBASEOFFSETPTRA]]
+// CHECK: }
+
+BB* c() { return x; }
+// CHECK: @_Z1cv() nounwind
+// CHECK: [[VBASEOFFSETPTRC:%[a-zA-Z0-9\.]+]] = getelementptr i8* {{.*}}, i64 -24
+// CHECK: [[CASTVBASEOFFSETPTRC:%[a-zA-Z0-9\.]+]] = bitcast i8* [[VBASEOFFSETPTRC]] to i32*
+// CHECK: [[VBASEOFFSETC:%[a-zA-Z0-9\.]+]] = load i32* [[CASTVBASEOFFSETPTRC]]
+// CHECK: add i32 [[VBASEOFFSETC]], 8
+// CHECK: }