copy-constructor-elim-2.cpp revision 9cbe4f0ba01ec304e1e3d071c071f7bca33631c0 
1// RUN: %clang_cc1 -emit-llvm -o - %s | FileCheck %s
2
3struct A { int x; A(int); ~A(); };
4A f() { return A(0); }
5// CHECK: define void @_Z1fv
6// CHECK: call {{.*}} @_ZN1AC1Ei
7// CHECK-NEXT: ret void
8
9// Verify that we do not elide copies when constructing a base class.
10namespace no_elide_base {
11  struct Base {
12    Base(const Base&);
13    ~Base();
14  };
15
16  struct Other {
17    operator Base() const;
18  };
19
20  struct Derived : public virtual Base {
21    Derived(const Other &O);
22  };
23
24  // CHECK: define {{.*}} @_ZN13no_elide_base7DerivedC1ERKNS_5OtherE(%"struct.no_elide_base::Derived"* %this, %"struct.no_elide_base::Other"* %O) unnamed_addr
25  Derived::Derived(const Other &O)
26    // CHECK: call {{.*}} @_ZNK13no_elide_base5OthercvNS_4BaseEEv
27    // CHECK: call {{.*}} @_ZN13no_elide_base4BaseC2ERKS0_
28    // CHECK: call {{.*}} @_ZN13no_elide_base4BaseD1Ev
29    : Base(O)
30  {
31    // CHECK: ret
32  }
33}
34
35// PR8683.
36
37namespace PR8683 {
38
39struct A {
40  A();
41  A(const A&);
42  A& operator=(const A&);
43};
44
45struct B {
46  A a;
47};
48
49void f() {
50  // Verify that we don't mark the copy constructor in this expression as elidable.
51  // CHECK: call {{.*}} @_ZN6PR86831AC1ERKS0_
52  A a = (B().a);
53}
54
55}
56