clang/test/CodeGenCXX/dynamic_cast-no-rtti.cpp

   1 // RUN: %clang_cc1 -emit-llvm %s -verify -fno-rtti -triple %itanium_abi_triple -o - | FileCheck %s
   2 // expected-no-diagnostics
   3
   4 struct A {
   5   virtual ~A(){};
   6 };
   7
   8 struct B : public A {
   9   B() : A() {}
  10 };
  11
  12 // An upcast can be resolved statically and can be used with -fno-rtti, iff it
  13 // does not use runtime support.
  14 A *upcast(B *b) {
  15   return dynamic_cast<A *>(b);
  16 // CHECK-LABEL: define {{.*}}ptr @_Z6upcastP1B
  17 // CHECK-NOT: call {{.*}}ptr @__dynamic_cast
  18 }
  19
  20 // A NoOp dynamic_cast can be used with -fno-rtti iff it does not use
  21 // runtime support.
  22 B *samecast(B *b) {
  23   return dynamic_cast<B *>(b);
  24 // CHECK-LABEL: define {{.*}}ptr @_Z8samecastP1B
  25 // CHECK-NOT: call {{.*}}ptr @__dynamic_cast
  26 }