xref: /aosp_15_r20/external/clang/test/CodeGenCXX/derived-to-base.cpp (revision 67e74705e28f6214e480b399dd47ea732279e315) 
1*67e74705SXin Li // RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s
2*67e74705SXin Li struct A {
3*67e74705SXin Li   void f();
4*67e74705SXin Li 
5*67e74705SXin Li   int a;
6*67e74705SXin Li };
7*67e74705SXin Li 
8*67e74705SXin Li struct B : A {
9*67e74705SXin Li   double b;
10*67e74705SXin Li };
11*67e74705SXin Li 
f()12*67e74705SXin Li void f() {
13*67e74705SXin Li   B b;
14*67e74705SXin Li 
15*67e74705SXin Li   b.f();
16*67e74705SXin Li }
17*67e74705SXin Li 
18*67e74705SXin Li // CHECK: define %struct.B* @_Z1fP1A(%struct.A* %a) [[NUW:#[0-9]+]]
f(A * a)19*67e74705SXin Li B *f(A *a) {
20*67e74705SXin Li   // CHECK-NOT: br label
21*67e74705SXin Li   // CHECK: ret %struct.B*
22*67e74705SXin Li   return static_cast<B*>(a);
23*67e74705SXin Li }
24*67e74705SXin Li 
25*67e74705SXin Li // PR5965
26*67e74705SXin Li namespace PR5965 {
27*67e74705SXin Li 
28*67e74705SXin Li // CHECK: define %struct.A* @_ZN6PR59651fEP1B(%struct.B* %b) [[NUW]]
f(B * b)29*67e74705SXin Li A *f(B* b) {
30*67e74705SXin Li   // CHECK-NOT: br label
31*67e74705SXin Li   // CHECK: ret %struct.A*
32*67e74705SXin Li   return b;
33*67e74705SXin Li }
34*67e74705SXin Li 
35*67e74705SXin Li }
36*67e74705SXin Li 
37*67e74705SXin Li // Don't crash on a derived-to-base conversion of an r-value
38*67e74705SXin Li // aggregate.
39*67e74705SXin Li namespace test3 {
40*67e74705SXin Li   struct A {};
41*67e74705SXin Li   struct B : A {};
42*67e74705SXin Li 
43*67e74705SXin Li   void foo(A a);
test()44*67e74705SXin Li   void test() {
45*67e74705SXin Li     foo(B());
46*67e74705SXin Li   }
47*67e74705SXin Li }
48*67e74705SXin Li 
49*67e74705SXin Li // CHECK: attributes [[NUW]] = { nounwind{{.*}} }
50