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 class Parent {
  40 public:
  41   Parent() {}
  42   virtual ~Parent();
  43   virtual void * getFoo() const = 0;
  44 };
  45
  46 class Derived : public Parent {
  47 public:
  48   Derived();
  49   void * getFoo() const;
  50 };
  51
  52 class VeryDerived : public Derived { // expected-warning{{'VeryDerived' has no out-of-line virtual method definitions; its vtable will be emitted in every translation unit}}
  53 public:
  54   void * getFoo() const { return 0; }
  55 };
  56
  57 Parent::~Parent() {}
  58
  59 void uses_derived() {
  60   Derived d;
  61   VeryDerived vd;
  62 }
  63
  64 template<typename T> struct TemplVirt {
  65   virtual void f();
  66 };
  67
  68 template class TemplVirt<float>;
  69
  70 template<> struct TemplVirt<bool> {
  71   virtual void f();
  72 };
  73
  74 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}}
  75   virtual void f() {}
  76 };
  77
  78 void uses_templ() {
  79   TemplVirt<float> f;
  80   TemplVirt<bool> b;
  81   TemplVirt<long> l;
  82 }