1// RUN: %clang_cc1 -fno-rtti -emit-llvm -triple=i386-pc-win32 %s -o - | FileCheck %s
2
3// In each test case, we have two member pointers whose thunks have the same
4// vtable offset and same mangling, but their prototypes conflict.  The
5// arguments and return type may differ.  Therefore, we have to bitcast the
6// function prototype.  Unfortunately, if the return types differ, LLVM's
7// optimizers can get upset.
8
9namespace num_params {
10struct A { virtual void a(int); };
11struct B { virtual void b(int, int); };
12struct C : A, B {
13  virtual void a(int);
14  virtual void b(int, int);
15};
16void f(C *c) {
17  (c->*(&C::a))(0);
18  (c->*(&C::b))(0, 0);
19}
20}
21
22// CHECK-LABEL: define void @"\01?f@num_params@@YAXPAUC@1@@Z"(%"struct.num_params::C"* %c)
23// CHECK: call x86_thiscallcc void bitcast (void (%"struct.num_params::C"*, ...)* @"\01??_9C@num_params@@$BA@AE" to void (%"struct.num_params::C"*, i32)*)(%"struct.num_params::C"* %{{.*}}, i32 0)
24// CHECK: call x86_thiscallcc void bitcast (void (%"struct.num_params::C"*, ...)* @"\01??_9C@num_params@@$BA@AE" to void (%"struct.num_params::C"*, i32, i32)*)(%"struct.num_params::C"* %{{.*}}, i32 0, i32 0)
25
26// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"\01??_9C@num_params@@$BA@AE"(%"struct.num_params::C"* %this, ...) {{.*}} comdat
27// CHECK: musttail call x86_thiscallcc void (%"struct.num_params::C"*, ...) %{{.*}}(%"struct.num_params::C"* %{{.*}}, ...)
28// CHECK-NEXT: ret void
29
30namespace i64_return {
31struct A { virtual int a(); };
32struct B { virtual long long b(); };
33struct C : A, B {
34  virtual int a();
35  virtual long long b();
36};
37long long f(C *c) {
38  int x = (c->*(&C::a))();
39  long long y = (c->*(&C::b))();
40  return x + y;
41}
42}
43
44// CHECK-LABEL: define i64 @"\01?f@i64_return@@YA_JPAUC@1@@Z"(%"struct.i64_return::C"* %c)
45// CHECK: call x86_thiscallcc i32 bitcast (void (%"struct.i64_return::C"*, ...)* @"\01??_9C@i64_return@@$BA@AE" to i32 (%"struct.i64_return::C"*)*)(%"struct.i64_return::C"* %{{.*}})
46// CHECK: call x86_thiscallcc i64 bitcast (void (%"struct.i64_return::C"*, ...)* @"\01??_9C@i64_return@@$BA@AE" to i64 (%"struct.i64_return::C"*)*)(%"struct.i64_return::C"* %{{.*}})
47
48// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"\01??_9C@i64_return@@$BA@AE"(%"struct.i64_return::C"* %this, ...) {{.*}} comdat
49// CHECK: musttail call x86_thiscallcc void (%"struct.i64_return::C"*, ...) %{{.*}}(%"struct.i64_return::C"* %{{.*}}, ...)
50// CHECK-NEXT: ret void
51
52namespace sret {
53struct Big { int big[32]; };
54struct A { virtual int a(); };
55struct B { virtual Big b(); };
56struct C : A, B {
57  virtual int a();
58  virtual Big b();
59};
60void f(C *c) {
61  (c->*(&C::a))();
62  Big b((c->*(&C::b))());
63}
64}
65
66// CHECK-LABEL: define void @"\01?f@sret@@YAXPAUC@1@@Z"(%"struct.sret::C"* %c)
67// CHECK: call x86_thiscallcc i32 bitcast (void (%"struct.sret::C"*, ...)* @"\01??_9C@sret@@$BA@AE" to i32 (%"struct.sret::C"*)*)(%"struct.sret::C"* %{{.*}})
68// CHECK: call x86_thiscallcc void bitcast (void (%"struct.sret::C"*, ...)* @"\01??_9C@sret@@$BA@AE" to void (%"struct.sret::C"*, %"struct.sret::Big"*)*)(%"struct.sret::C"* %{{.*}}, %"struct.sret::Big"* sret %{{.*}})
69
70// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"\01??_9C@sret@@$BA@AE"(%"struct.sret::C"* %this, ...) {{.*}} comdat
71// CHECK: musttail call x86_thiscallcc void (%"struct.sret::C"*, ...) %{{.*}}(%"struct.sret::C"* %{{.*}}, ...)
72// CHECK-NEXT: ret void
73
74namespace cdecl_inalloca {
75// Fairly evil, since now we end up doing an inalloca-style call through a
76// thunk that doesn't use inalloca.  Hopefully the stacks line up?
77struct Big {
78  Big();
79  ~Big();
80  int big[32];
81};
82struct A { virtual void __cdecl a(); };
83struct B { virtual void __cdecl b(Big); };
84struct C : A, B {
85  virtual void __cdecl a();
86  virtual void __cdecl b(Big);
87};
88void f(C *c) {
89  Big b;
90  (c->*(&C::a))();
91  ((c->*(&C::b))(b));
92}
93}
94
95// CHECK-LABEL: define void @"\01?f@cdecl_inalloca@@YAXPAUC@1@@Z"(%"struct.cdecl_inalloca::C"* %c)
96// CHECK: call void bitcast (void (%"struct.cdecl_inalloca::C"*, ...)* @"\01??_9C@cdecl_inalloca@@$BA@AA" to void (%"struct.cdecl_inalloca::C"*)*)(%"struct.cdecl_inalloca::C"* %{{.*}})
97// CHECK: call void bitcast (void (%"struct.cdecl_inalloca::C"*, ...)* @"\01??_9C@cdecl_inalloca@@$BA@AA" to void (<{ %"struct.cdecl_inalloca::C"*, %"struct.cdecl_inalloca::Big" }>*)*)(<{ %"struct.cdecl_inalloca::C"*, %"struct.cdecl_inalloca::Big" }>* inalloca %{{.*}})
98
99// CHECK-LABEL: define linkonce_odr void @"\01??_9C@cdecl_inalloca@@$BA@AA"(%"struct.cdecl_inalloca::C"* %this, ...) {{.*}} comdat
100// CHECK: musttail call void (%"struct.cdecl_inalloca::C"*, ...) %{{.*}}(%"struct.cdecl_inalloca::C"* %{{.*}}, ...)
101// CHECK-NEXT: ret void
102