clang/test/CodeGenCXX/RelativeVTablesABI/overriden-virtual-function.cpp

   1 // Check the layout of the vtable for a child class that inherits a virtual
   2 // function but does override it.
   3
   4 // RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O1 -S -o - -emit-llvm -fhalf-no-semantic-interposition | FileCheck %s
   5
   6 // CHECK: @_ZTV1B.local = private unnamed_addr constant { [4 x i32] } { [4 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32] }, ptr @_ZTV1B.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1B3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32] }, ptr @_ZTV1B.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1B3barEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32] }, ptr @_ZTV1B.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, align 4
   7
   8 // CHECK: @_ZTV1B ={{.*}} unnamed_addr alias { [4 x i32] }, ptr @_ZTV1B.local
   9
  10 class A {
  11 public:
  12   virtual void foo();
  13 };
  14
  15 class B : public A {
  16 public:
  17   void foo() override;
  18   virtual void bar();
  19 };
  20
  21 void A::foo() {}
  22 void B::foo() {}
  23
  24 void A_foo(A *a) {
  25   a->foo();
  26 }
  27
  28 void B_foo(B *b) {
  29   b->foo();
  30 }