clang/test/SemaCXX/warn-weak-vtables.cpp

   1 // RUN: %clang_cc1 %s -fsyntax-only -verify -triple %itanium_abi_triple -Wweak-vtables
   2 //
   3 // Check that this warning is disabled on MS ABI targets which don't have key
   4 // functions.
   5 // RUN: %clang_cc1 %s -fsyntax-only -triple %ms_abi_triple -Werror -Wweak-vtables
   6 //
   7 // -Wweak-template-vtables is deprecated but we still parse it.
   8 // RUN: %clang_cc1 %s -fsyntax-only -Werror -Wweak-template-vtables
   9
  10 struct A { // expected-warning {{'A' has no out-of-line virtual method definitions; its vtable will be emitted in every translation unit}}
  11   virtual void f() { }
  12 };
  13
  14 template<typename T> struct B {
  15   virtual void f() { }
  16 };
  17
  18 namespace {
  19   struct C {
  20     virtual void f() { }
  21   };
  22 }
  23
  24 void f() {
  25   struct A {
  26     virtual void f() { }
  27   };
  28
  29   A a;
  30 }
  31
  32 // Use the vtables
  33 void uses_abc() {
  34   A a;
  35   B<int> b;
  36   C c;
  37 }
  38
  39 // <rdar://problem/9979458>
  40 class Parent {
  41 public:
  42   Parent() {}
  43   virtual ~Parent();
  44   virtual void * getFoo() const = 0;
  45 };
  46
  47 class Derived : public Parent {
  48 public:
  49   Derived();
  50   void * getFoo() const;
  51 };
  52
  53 class VeryDerived : public Derived { // expected-warning{{'VeryDerived' has no out-of-line virtual method definitions; its vtable will be emitted in every translation unit}}
  54 public:
  55   void * getFoo() const { return 0; }
  56 };
  57
  58 Parent::~Parent() {}
  59
  60 void uses_derived() {
  61   Derived d;
  62   VeryDerived vd;
  63 }
  64
  65 template<typename T> struct TemplVirt {
  66   virtual void f();
  67 };
  68
  69 template class TemplVirt<float>;
  70
  71 template<> struct TemplVirt<bool> {
  72   virtual void f();
  73 };
  74
  75 template<> struct TemplVirt<long> { // expected-warning{{'TemplVirt<long>' has no out-of-line virtual method definitions; its vtable will be emitted in every translation unit}}
  76   virtual void f() {}
  77 };
  78
  79 void uses_templ() {
  80   TemplVirt<float> f;
  81   TemplVirt<bool> b;
  82   TemplVirt<long> l;
  83 }