clang/test/CodeGenCXX/apple-kext-indirect-call.cpp

   1 // RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fapple-kext -emit-llvm -o - %s | FileCheck %s
   2
   3 // CHECK: @_ZTV5TemplIiE = internal unnamed_addr constant { [5 x i8*] } { [5 x i8*] [i8* null, i8* bitcast ({ i8*, i8* }* @_ZTI5TemplIiE to i8*), i8* bitcast (void (%struct.Templ*)* @_ZN5TemplIiE1fEv to i8*), i8* bitcast (void (%struct.Templ*)* @_ZN5TemplIiE1gEv to i8*), i8* null] }
   4
   5 struct Base {
   6   virtual void abc(void) const;
   7 };
   8
   9 void Base::abc(void) const {}
  10
  11 void FUNC(Base* p) {
  12   p->Base::abc();
  13 }
  14
  15 // CHECK: getelementptr inbounds (void (%struct.Base*)*, void (%struct.Base*)** bitcast ({ [4 x i8*] }* @_ZTV4Base to void (%struct.Base*)**), i64 2)
  16 // CHECK-NOT: call void @_ZNK4Base3abcEv
  17
  18 template<class T>
  19 struct Templ {
  20   virtual void f() {}
  21   virtual void g() {}
  22 };
  23 template<class T>
  24 struct SubTempl : public Templ<T> {
  25   virtual void f() {} // override
  26   virtual void g() {} // override
  27 };
  28
  29 void f(SubTempl<int>* t) {
  30   // Qualified calls go through the (qualified) vtable in apple-kext mode.
  31   // Since t's this pointer points to SubTempl's vtable, the call needs
  32   // to load Templ<int>'s vtable.  Hence, Templ<int>::g needs to be
  33   // instantiated in this TU, for it's referenced by the vtable.
  34   // (This happens only in apple-kext mode; elsewhere virtual calls can always
  35   // use the vtable pointer off this instead of having to load the vtable
  36   // symbol.)
  37   t->Templ::f();
  38 }
  39
  40 // CHECK: getelementptr inbounds (void (%struct.Templ*)*, void (%struct.Templ*)** bitcast ({ [5 x i8*] }* @_ZTV5TemplIiE to void (%struct.Templ*)**), i64 2)
  41 // CHECK: define internal void @_ZN5TemplIiE1fEv(%struct.Templ* {{[^,]*}} %this)
  42 // CHECK: define internal void @_ZN5TemplIiE1gEv(%struct.Templ* {{[^,]*}} %this)