vtable-layout-abi-examples.cpp revision eb577d0df44df4df974e9b3a538575d92358a3b3 
1// RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -emit-llvm-only -fdump-vtable-layouts 2>&1 | FileCheck %s
2
3/// Examples from the Itanium C++ ABI specification.
4/// http://www.codesourcery.com/public/cxx-abi/
5
6namespace Test1 {
7
8// This is from http://www.codesourcery.com/public/cxx-abi/cxx-vtable-ex.html
9
10// CHECK:      Vtable for 'Test1::A' (5 entries).
11// CHECK-NEXT:    0 | offset_to_top (0)
12// CHECK-NEXT:    1 | Test1::A RTTI
13// CHECK-NEXT:        -- (Test1::A, 0) vtable address --
14// CHECK-NEXT:    2 | void Test1::A::f()
15// CHECK-NEXT:    3 | void Test1::A::g()
16// CHECK-NEXT:    4 | void Test1::A::h()
17struct A {
18  virtual void f ();
19  virtual void g ();
20  virtual void h ();
21  int ia;
22};
23void A::f() {}
24
25// CHECK:      Vtable for 'Test1::B' (13 entries).
26// CHECK-NEXT:    0 | vbase_offset (16)
27// CHECK-NEXT:    1 | offset_to_top (0)
28// CHECK-NEXT:    2 | Test1::B RTTI
29// CHECK-NEXT:        -- (Test1::B, 0) vtable address --
30// CHECK-NEXT:    3 | void Test1::B::f()
31// CHECK-NEXT:    4 | void Test1::B::h()
32// CHECK-NEXT:    5 | vcall_offset (-16)
33// CHECK-NEXT:    6 | vcall_offset (0)
34// CHECK-NEXT:    7 | vcall_offset (-16)
35// CHECK-NEXT:    8 | offset_to_top (-16)
36// CHECK-NEXT:    9 | Test1::B RTTI
37// CHECK-NEXT:        -- (Test1::A, 16) vtable address --
38// CHECK-NEXT:   10 | void Test1::B::f()
39// CHECK-NEXT:        [this adjustment: 0 non-virtual, -24 vcall offset offset]
40// CHECK-NEXT:   11 | void Test1::A::g()
41// CHECK-NEXT:   12 | void Test1::B::h()
42// CHECK-NEXT:        [this adjustment: 0 non-virtual, -40 vcall offset offset]
43struct B: public virtual A {
44  void f ();
45  void h ();
46  int ib;
47};
48void B::f() {}
49
50}
51