1 // RUN: %clang_cc1 -std=c++11 -fno-rtti -emit-llvm -triple=i386-pc-win32 %s -o - | FileCheck %s --check-prefix=CHECK32
2 // RUN: %clang_cc1 -std=c++11 -fno-rtti -emit-llvm -triple=x86_64-pc-win32 %s -o - | FileCheck %s --check-prefix=CHECK64
3 
4 struct S {
5   int x, y, z;
6 };
7 
8 // U is not trivially copyable, and requires inalloca to pass by value.
9 struct U {
10   int u;
11   U();
12   ~U();
13   U(const U &);
14 };
15 
16 struct B;
17 
18 struct C {
19   virtual void foo();
20   virtual int bar(int, double);
21   virtual S baz(int);
22   virtual S qux(U);
23   virtual void thud(...);
24   virtual void (B::*plugh())();
25 };
26 
27 namespace {
28 struct D {
29   virtual void foo();
30 };
31 }
32 
f()33 void f() {
34   void (C::*ptr)();
35   ptr = &C::foo;
36   ptr = &C::foo; // Don't crash trying to define the thunk twice :)
37 
38   int (C::*ptr2)(int, double);
39   ptr2 = &C::bar;
40 
41   S (C::*ptr3)(int);
42   ptr3 = &C::baz;
43 
44   void (D::*ptr4)();
45   ptr4 = &D::foo;
46 
47   S (C::*ptr5)(U);
48   ptr5 = &C::qux;
49 
50   void (C::*ptr6)(...);
51   ptr6 = &C::thud;
52 
53   auto ptr7 = &C::plugh;
54 
55 
56 // CHECK32-LABEL: define dso_local void @"?f@@YAXXZ"()
57 // CHECK32: store i8* bitcast (void (%struct.C*, ...)* @"??_9C@@$BA@AE" to i8*), i8** %ptr
58 // CHECK32: store i8* bitcast (void (%struct.C*, ...)* @"??_9C@@$B3AE" to i8*), i8** %ptr2
59 // CHECK32: store i8* bitcast (void (%struct.C*, ...)* @"??_9C@@$B7AE" to i8*), i8** %ptr3
60 // CHECK32: store i8* bitcast (void (%"struct.(anonymous namespace)::D"*, ...)* @"??_9D@?A0x{{[^@]*}}@@$BA@AE" to i8*), i8** %ptr4
61 // CHECK32: }
62 //
63 // CHECK64-LABEL: define dso_local void @"?f@@YAXXZ"()
64 // CHECK64: store i8* bitcast (void (%struct.C*, ...)* @"??_9C@@$BA@AA" to i8*), i8** %ptr
65 // CHECK64: store i8* bitcast (void (%struct.C*, ...)* @"??_9C@@$B7AA" to i8*), i8** %ptr2
66 // CHECK64: store i8* bitcast (void (%struct.C*, ...)* @"??_9C@@$BBA@AA" to i8*), i8** %ptr3
67 // CHECK64: store i8* bitcast (void (%"struct.(anonymous namespace)::D"*, ...)* @"??_9D@?A0x{{[^@]*}}@@$BA@AA" to i8*), i8** %ptr
68 // CHECK64: }
69 }
70 
71 
72 // Thunk for calling the 1st virtual function in C with no parameters.
73 // CHECK32-LABEL: define linkonce_odr x86_thiscallcc void @"??_9C@@$BA@AE"(%struct.C* %this, ...)
74 // CHECK32: #[[ATTR:[0-9]+]]
75 // CHECK32-NOT:             unnamed_addr
76 // CHECK32:                 comdat
77 // CHECK32: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 0
78 // CHECK32: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
79 // CHECK32: musttail call x86_thiscallcc void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
80 // CHECK32-NEXT: ret void
81 // CHECK32: }
82 //
83 // CHECK64-LABEL: define linkonce_odr void @"??_9C@@$BA@AA"(%struct.C* %this, ...)
84 // CHECK64: #[[ATTR:[0-9]+]]
85 // CHECK64-NOT:             unnamed_addr
86 // CHECK64:                 comdat
87 // CHECK64: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 0
88 // CHECK64: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
89 // CHECK64: musttail call void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
90 // CHECK64-NEXT: ret void
91 // CHECK64: }
92 
93 // Thunk for calling the 2nd virtual function in C, taking int and double as parameters, returning int.
94 // CHECK32-LABEL: define linkonce_odr x86_thiscallcc void @"??_9C@@$B3AE"(%struct.C* %this, ...)
95 // CHECK32: #[[ATTR]] comdat
96 // CHECK32: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 1
97 // CHECK32: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
98 // CHECK32: musttail call x86_thiscallcc void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
99 // CHECK32-NEXT: ret void
100 // CHECK32: }
101 //
102 // CHECK64-LABEL: define linkonce_odr void @"??_9C@@$B7AA"(%struct.C* %this, ...)
103 // CHECK64: #[[ATTR]] comdat
104 // CHECK64: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 1
105 // CHECK64: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
106 // CHECK64: musttail call void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
107 // CHECK64-NEXT: ret void
108 // CHECK64: }
109 
110 // Thunk for calling the 3rd virtual function in C, taking an int parameter, returning a struct.
111 // CHECK32-LABEL: define linkonce_odr x86_thiscallcc void @"??_9C@@$B7AE"(%struct.C* %this, ...)
112 // CHECK32: #[[ATTR]] comdat
113 // CHECK32: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 2
114 // CHECK32: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
115 // CHECK32: musttail call x86_thiscallcc void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
116 // CHECK32-NEXT: ret void
117 // CHECK32: }
118 //
119 // CHECK64-LABEL: define linkonce_odr void @"??_9C@@$BBA@AA"(%struct.C* %this, ...)
120 // CHECK64: #[[ATTR]] comdat
121 // CHECK64: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 2
122 // CHECK64: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
123 // CHECK64: musttail call void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
124 // CHECK64-NEXT: ret void
125 // CHECK64: }
126 
127 // Thunk for calling the virtual function in internal class D.
128 // CHECK32-LABEL: define internal x86_thiscallcc void @"??_9D@?A0x{{[^@]*}}@@$BA@AE"(%"struct.(anonymous namespace)::D"* %this, ...)
129 // CHECK32: #[[ATTR]]
130 // CHECK32: [[VPTR:%.*]] = getelementptr inbounds void (%"struct.(anonymous namespace)::D"*, ...)*, void (%"struct.(anonymous namespace)::D"*, ...)** %{{.*}}, i64 0
131 // CHECK32: [[CALLEE:%.*]] = load void (%"struct.(anonymous namespace)::D"*, ...)*, void (%"struct.(anonymous namespace)::D"*, ...)** [[VPTR]]
132 // CHECK32: musttail call x86_thiscallcc void (%"struct.(anonymous namespace)::D"*, ...) [[CALLEE]](%"struct.(anonymous namespace)::D"* %{{.*}}, ...)
133 // CHECK32-NEXT: ret void
134 // CHECK32: }
135 //
136 // CHECK64-LABEL: define internal void @"??_9D@?A0x{{[^@]*}}@@$BA@AA"(%"struct.(anonymous namespace)::D"* %this, ...)
137 // CHECK64: #[[ATTR]]
138 // CHECK64: [[VPTR:%.*]] = getelementptr inbounds void (%"struct.(anonymous namespace)::D"*, ...)*, void (%"struct.(anonymous namespace)::D"*, ...)** %{{.*}}, i64 0
139 // CHECK64: [[CALLEE:%.*]] = load void (%"struct.(anonymous namespace)::D"*, ...)*, void (%"struct.(anonymous namespace)::D"*, ...)** [[VPTR]]
140 // CHECK64: musttail call void (%"struct.(anonymous namespace)::D"*, ...) [[CALLEE]](%"struct.(anonymous namespace)::D"* %{{.*}}, ...)
141 // CHECK64-NEXT: ret void
142 // CHECK64: }
143 
144 // Thunk for calling the fourth virtual function in C, taking a struct parameter
145 // and returning a struct.
146 // CHECK32-LABEL: define linkonce_odr x86_thiscallcc void @"??_9C@@$BM@AE"(%struct.C* %this, ...) {{.*}} comdat
147 // CHECK32: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 3
148 // CHECK32: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
149 // CHECK32: musttail call x86_thiscallcc void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
150 // CHECK32-NEXT: ret void
151 // CHECK32: }
152 //
153 // CHECK64-LABEL: define linkonce_odr void @"??_9C@@$BBI@AA"(%struct.C* %this, ...) {{.*}} comdat
154 // CHECK64: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 3
155 // CHECK64: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
156 // CHECK64: musttail call void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
157 // CHECK64: ret void
158 // CHECK64: }
159 
160 // Thunk for calling the fifth virtual function in C which uses the __cdecl calling convention.
161 // CHECK32-LABEL: define linkonce_odr void @"??_9C@@$BBA@AA"(%struct.C* %this, ...) {{.*}} comdat align 2 {
162 // CHECK32: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 4
163 // CHECK32: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
164 // CHECK32: musttail call void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
165 // CHECK32: ret void
166 // CHECK32: }
167 //
168 // CHECK64-LABEL: define linkonce_odr void @"??_9C@@$BCA@AA"(%struct.C* %this, ...) {{.*}} comdat align 2 {
169 // CHECK64: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 4
170 // CHECK64: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
171 // CHECK64: musttail call void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
172 // CHECK64: ret void
173 // CHECK64: }
174 
175 // CHECK32: define linkonce_odr x86_thiscallcc void @"??_9C@@$BBE@AE"(%struct.C* %this, ...) {{.*}} comdat align 2 {
176 // CHECK32: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 5
177 // CHECK32: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
178 // CHECK32: musttail call x86_thiscallcc void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
179 // CHECK32: ret void
180 // CHECK32: }
181 
182 // CHECK64: define linkonce_odr void @"??_9C@@$BCI@AA"(%struct.C* %this, ...) {{.*}} comdat align 2 {
183 // CHECK64: [[VPTR:%.*]] = getelementptr inbounds void (%struct.C*, ...)*, void (%struct.C*, ...)** %{{.*}}, i64 5
184 // CHECK64: [[CALLEE:%.*]] = load void (%struct.C*, ...)*, void (%struct.C*, ...)** [[VPTR]]
185 // CHECK64: musttail call void (%struct.C*, ...) [[CALLEE]](%struct.C* %{{.*}}, ...)
186 // CHECK64: ret void
187 // CHECK64: }
188 
189 // CHECK32: #[[ATTR]] = {{{.*}}"thunk"{{.*}}}
190