clang/test/CodeGenCXX/vtable-constexpr.cpp

   1 // RUN: %clang_cc1 -std=c++20 %s -emit-llvm -o - -triple %itanium_abi_triple | FileCheck %s --implicit-check-not=DoNotEmit
   2
   3 // constexpr virtual functions can be called at runtime and go in the vtable as
   4 // normal. But they are implicitly inline so are never the key function.
   5
   6 struct DoNotEmit {
   7   virtual constexpr void f();
   8 };
   9 constexpr void DoNotEmit::f() {}
  10
  11 // CHECK-DAG: @_ZTV1B = {{.*}} constant { [3 x ptr] } { {{.*}} null, {{.*}} @_ZTI1B, {{.*}} @_ZN1B1fEv
  12 struct B {
  13   // CHECK-DAG: define {{.*}} @_ZN1B1fEv
  14   virtual constexpr void f() {}
  15 };
  16 B b;
  17
  18 struct CBase {
  19   virtual constexpr void f(); // not key function
  20 };
  21
  22 // CHECK-DAG: @_ZTV1C = {{.*}} constant {{.*}} null, {{.*}} @_ZTI1C, {{.*}} @_ZN1C1fEv
  23 struct C : CBase {
  24   void f(); // key function
  25 };
  26 // CHECK-DAG: define {{.*}} @_ZN1C1fEv
  27 void C::f() {}