clang/test/CodeGenCXX/RelativeVTablesABI/diamond-inheritance.cpp

   1 // Diamond inheritance.
   2 // A more complicated multiple inheritance example that includes longer chain of inheritance and a common ancestor.
   3
   4 // RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O1 -S -o - -emit-llvm -fhalf-no-semantic-interposition | FileCheck %s
   5
   6 // VTable for B should contain offset to top (0), RTTI pointer, A::foo(), and B::barB().
   7 // 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 @_ZN1A3fooEv 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 @_ZN1B4barBEv 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
   8
   9 // VTable for C should contain offset to top (0), RTTI pointer, A::foo(), and C::barC().
  10 // CHECK: @_ZTV1C.local = private unnamed_addr constant { [4 x i32] } { [4 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1C.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32] }, ptr @_ZTV1C.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32] }, ptr @_ZTV1C.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1C4barCEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32] }, ptr @_ZTV1C.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, align 4
  11
  12 // VTable for D should be similar to the mutiple inheritance example where this
  13 // vtable contains 2 inner vtables:
  14 // - 1st table containing D::foo(), B::barB(), and D::baz().
  15 // - 2nd table containing a thunk to D::foo() and C::barC().
  16 // CHECK: @_ZTV1D.local = private unnamed_addr constant { [5 x i32], [4 x i32] } { [5 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1D.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1D3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1B4barBEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1D3bazEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 0, i32 2) to i64)) to i32)], [4 x i32] [i32 -8, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1D.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 1, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZThn8_N1D3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 1, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1C4barCEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 1, i32 2) to i64)) to i32)] }, align 4
  17
  18 // @_ZTV1B ={{.*}} unnamed_addr alias { [4 x i32] }, ptr @_ZTV1B.local
  19 // @_ZTV1C ={{.*}} unnamed_addr alias { [4 x i32] }, ptr @_ZTV1C.local
  20 // @_ZTV1D ={{.*}} unnamed_addr alias { [5 x i32], [4 x i32] }, ptr @_ZTV1D.local
  21
  22 class A {
  23 public:
  24   virtual void foo();
  25 };
  26
  27 class B : public A {
  28 public:
  29   virtual void barB();
  30 };
  31
  32 class C : public A {
  33   virtual void barC();
  34 };
  35
  36 // Should be a struct with 2 arrays from 2 parents.
  37 // The 1st contains D::foo(), B::barB(), and D::baz().
  38 // The 2nd contains C::barC(), and a thunk that points to D::foo().
  39 class D : public B, C {
  40 public:
  41   virtual void baz();
  42   void foo() override;
  43 };
  44
  45 void B::barB() {}
  46 void C::barC() {}
  47 void D::foo() {}
  48 void D::baz() {}
  49
  50 void D_foo(D *d) {
  51   d->foo();
  52 }