1 // RUN: %clang_cc1 -fno-rtti -emit-llvm %s -o - -mconstructor-aliases -triple=i386-pc-win32 | FileCheck %s
2 
3 struct Left {
4   virtual void left();
5 };
6 
7 struct Right {
8   virtual void right();
9 };
10 
11 struct ChildNoOverride : Left, Right {
12 };
13 
14 struct ChildOverride : Left, Right {
15   virtual void left();
16   virtual void right();
17 };
18 
19 extern "C" void foo(void *);
20 
21 void call_left_no_override(ChildNoOverride *child) {
22 // CHECK-LABEL: define dso_local void @"?call_left_no_override
23 // CHECK: %[[CHILD:.*]] = load %struct.ChildNoOverride
24 
25   child->left();
26 // Only need to cast 'this' to Left*.
27 // CHECK: %[[LEFT:.*]] = bitcast %struct.ChildNoOverride* %[[CHILD]] to %struct.Left*
28 // CHECK: %[[VFPTR:.*]] = bitcast %struct.Left* %[[LEFT]] to void (%struct.Left*)***
29 // CHECK: %[[VFTABLE:.*]] = load void (%struct.Left*)**, void (%struct.Left*)*** %[[VFPTR]]
30 // CHECK: %[[VFUN:.*]] = getelementptr inbounds void (%struct.Left*)*, void (%struct.Left*)** %[[VFTABLE]], i64 0
31 // CHECK: %[[VFUN_VALUE:.*]] = load void (%struct.Left*)*, void (%struct.Left*)** %[[VFUN]]
32 // CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](%struct.Left* {{[^,]*}} %[[LEFT]])
33 // CHECK: ret
34 }
35 
36 void ChildOverride::left() {
37 // CHECK-LABEL: define dso_local x86_thiscallcc void @"?left@ChildOverride@@UAEXXZ"
38 // CHECK-SAME: (%struct.ChildOverride* {{[^,]*}} %[[THIS:.*]])
39 //
40 // No need to adjust 'this' as the ChildOverride's layout begins with Left.
41 // CHECK: %[[THIS_ADDR:.*]] = alloca %struct.ChildOverride*, align 4
42 // CHECK: store %struct.ChildOverride* %[[THIS]], %struct.ChildOverride** %[[THIS_ADDR]], align 4
43 
44   foo(this);
45 // CHECK: %[[THIS:.*]] = load %struct.ChildOverride*, %struct.ChildOverride** %[[THIS_ADDR]]
46 // CHECK: %[[THIS_i8:.*]] = bitcast %struct.ChildOverride* %[[THIS]] to i8*
47 // CHECK: call void @foo(i8* noundef %[[THIS_i8]])
48 // CHECK: ret
49 }
50 
51 void call_left_override(ChildOverride *child) {
52 // CHECK-LABEL: define dso_local void @"?call_left_override
53 // CHECK: %[[CHILD:.*]] = load %struct.ChildOverride
54 
55   child->left();
56 // CHECK: %[[VFPTR:.*]] = bitcast %struct.ChildOverride* %[[CHILD]] to void (%struct.ChildOverride*)***
57 // CHECK: %[[VFTABLE:.*]] = load void (%struct.ChildOverride*)**, void (%struct.ChildOverride*)*** %[[VFPTR]]
58 // CHECK: %[[VFUN:.*]] = getelementptr inbounds void (%struct.ChildOverride*)*, void (%struct.ChildOverride*)** %[[VFTABLE]], i64 0
59 // CHECK: %[[VFUN_VALUE:.*]] = load void (%struct.ChildOverride*)*, void (%struct.ChildOverride*)** %[[VFUN]]
60 //
61 // CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](%struct.ChildOverride* {{[^,]*}} %[[CHILD]])
62 // CHECK: ret
63 }
64 
65 void call_right_no_override(ChildNoOverride *child) {
66 // CHECK-LABEL: define dso_local void @"?call_right_no_override
67 // CHECK: %[[CHILD:.*]] = load %struct.ChildNoOverride
68 
69   child->right();
70 // When calling a right base's virtual method, one needs to adjust 'this' at
71 // the caller site.
72 //
73 // CHECK: %[[CHILD_i8:.*]] = bitcast %struct.ChildNoOverride* %[[CHILD]] to i8*
74 // CHECK: %[[RIGHT_i8:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
75 // CHECK: %[[RIGHT:.*]] = bitcast i8* %[[RIGHT_i8]] to %struct.Right*
76 //
77 // CHECK: %[[VFPTR:.*]] = bitcast %struct.Right* %[[RIGHT]] to void (%struct.Right*)***
78 // CHECK: %[[VFTABLE:.*]] = load void (%struct.Right*)**, void (%struct.Right*)*** %[[VFPTR]]
79 // CHECK: %[[VFUN:.*]] = getelementptr inbounds void (%struct.Right*)*, void (%struct.Right*)** %[[VFTABLE]], i64 0
80 // CHECK: %[[VFUN_VALUE:.*]] = load void (%struct.Right*)*, void (%struct.Right*)** %[[VFUN]]
81 // CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](%struct.Right* {{[^,]*}} %[[RIGHT]])
82 // CHECK: ret
83 }
84 
85 void ChildOverride::right() {
86 // CHECK-LABEL: define dso_local x86_thiscallcc void @"?right@ChildOverride@@UAEXXZ"(i8*
87 //
88 // ChildOverride::right gets 'this' cast to Right* in ECX (i.e. this+4) so we
89 // need to adjust 'this' before use.
90 //
91 // CHECK: %[[THIS_STORE:.*]] = alloca %struct.ChildOverride*, align 4
92 // CHECK: %[[THIS_ADDR:.*]] = alloca %struct.ChildOverride*, align 4
93 // CHECK: %[[COERCE_VAL:.*]] = bitcast i8* %[[ECX:.*]] to %struct.ChildOverride*
94 // CHECK: store %struct.ChildOverride* %[[COERCE_VAL]], %struct.ChildOverride** %[[THIS_STORE]], align 4
95 // CHECK: %[[THIS_INIT:.*]] = load %struct.ChildOverride*, %struct.ChildOverride** %[[THIS_STORE]], align 4
96 // CHECK: store %struct.ChildOverride* %[[THIS_INIT]], %struct.ChildOverride** %[[THIS_ADDR]], align 4
97 // CHECK: %[[THIS_RELOAD:.*]] = load %struct.ChildOverride*, %struct.ChildOverride** %[[THIS_ADDR]]
98 // CHECK: %[[THIS_i8:.*]] = bitcast %struct.ChildOverride* %[[THIS_RELOAD]] to i8*
99 // CHECK: %[[THIS_ADJUSTED:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 -4
100 // CHECK: %[[THIS:.*]] = bitcast i8* %[[THIS_ADJUSTED]] to %struct.ChildOverride*
101 
102   foo(this);
103 // CHECK: %[[THIS_PARAM:.*]] = bitcast %struct.ChildOverride* %[[THIS]] to i8*
104 // CHECK: call void @foo(i8* noundef %[[THIS_PARAM]])
105 // CHECK: ret
106 }
107 
108 void call_right_override(ChildOverride *child) {
109 // CHECK-LABEL: define dso_local void @"?call_right_override
110 // CHECK: %[[CHILD:.*]] = load %struct.ChildOverride
111 
112   child->right();
113 // When calling a right child's virtual method, one needs to adjust 'this' at
114 // the caller site.
115 //
116 // CHECK: %[[CHILD_i8:.*]] = bitcast %struct.ChildOverride* %[[CHILD]] to i8*
117 // CHECK: %[[RIGHT:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
118 //
119 // CHECK: %[[CHILD_i8:.*]] = bitcast %struct.ChildOverride* %[[CHILD]] to i8*
120 // CHECK: %[[VFPTR_i8:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
121 // CHECK: %[[VFPTR:.*]] = bitcast i8* %[[VFPTR_i8]] to void (i8*)***
122 // CHECK: %[[VFTABLE:.*]] = load void (i8*)**, void (i8*)*** %[[VFPTR]]
123 // CHECK: %[[VFUN:.*]] = getelementptr inbounds void (i8*)*, void (i8*)** %[[VFTABLE]], i64 0
124 // CHECK: %[[VFUN_VALUE:.*]] = load void (i8*)*, void (i8*)** %[[VFUN]]
125 //
126 // CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](i8* noundef %[[RIGHT]])
127 // CHECK: ret
128 }
129 
130 struct GrandchildOverride : ChildOverride {
131   virtual void right();
132 };
133 
134 void GrandchildOverride::right() {
135 // CHECK-LABEL: define dso_local x86_thiscallcc void @"?right@GrandchildOverride@@UAEXXZ"(i8*
136 //
137 // CHECK: %[[THIS_STORE:.*]] = alloca %struct.GrandchildOverride*, align 4
138 // CHECK: %[[THIS_ADDR:.*]] = alloca %struct.GrandchildOverride*, align 4
139 // CHECK: %[[COERCE_VAL:.*]] = bitcast i8* %[[ECX:.*]] to %struct.GrandchildOverride*
140 // CHECK: store %struct.GrandchildOverride* %[[COERCE_VAL]], %struct.GrandchildOverride** %[[THIS_STORE]], align 4
141 // CHECK: %[[THIS_INIT:.*]] = load %struct.GrandchildOverride*, %struct.GrandchildOverride** %[[THIS_STORE]], align 4
142 // CHECK: store %struct.GrandchildOverride* %[[THIS_INIT]], %struct.GrandchildOverride** %[[THIS_ADDR]], align 4
143 // CHECK: %[[THIS_RELOAD:.*]] = load %struct.GrandchildOverride*, %struct.GrandchildOverride** %[[THIS_ADDR]]
144 // CHECK: %[[THIS_i8:.*]] = bitcast %struct.GrandchildOverride* %[[THIS_RELOAD]] to i8*
145 // CHECK: %[[THIS_ADJUSTED:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 -4
146 // CHECK: %[[THIS:.*]] = bitcast i8* %[[THIS_ADJUSTED]] to %struct.GrandchildOverride*
147 
148   foo(this);
149 // CHECK: %[[THIS_PARAM:.*]] = bitcast %struct.GrandchildOverride* %[[THIS]] to i8*
150 // CHECK: call void @foo(i8* noundef %[[THIS_PARAM]])
151 // CHECK: ret
152 }
153 
154 void call_grandchild_right(GrandchildOverride *obj) {
155   // Just make sure we don't crash.
156   obj->right();
157 }
158 
159 void emit_ctors() {
160   Left l;
161   // CHECK-LABEL: define {{.*}} @"??0Left@@QAE@XZ"
162   // CHECK-NOT: getelementptr
163   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"??_7Left@@6B@" to i32 (...)**)
164   // CHECK: ret
165 
166   Right r;
167   // CHECK-LABEL: define {{.*}} @"??0Right@@QAE@XZ"
168   // CHECK-NOT: getelementptr
169   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"??_7Right@@6B@" to i32 (...)**)
170   // CHECK: ret
171 
172   ChildOverride co;
173   // CHECK-LABEL: define {{.*}} @"??0ChildOverride@@QAE@XZ"
174   // CHECK:   %[[THIS:.*]] = load %struct.ChildOverride*, %struct.ChildOverride**
175   // CHECK:   %[[VFPTR:.*]] = bitcast %struct.ChildOverride* %[[THIS]] to i32 (...)***
176   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"??_7ChildOverride@@6BLeft@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
177   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.ChildOverride* %[[THIS]] to i8*
178   // CHECK:   %[[VFPTR_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 4
179   // CHECK:   %[[VFPTR:.*]] = bitcast i8* %[[VFPTR_i8]] to i32 (...)***
180   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"??_7ChildOverride@@6BRight@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
181   // CHECK: ret
182 
183   GrandchildOverride gc;
184   // CHECK-LABEL: define {{.*}} @"??0GrandchildOverride@@QAE@XZ"
185   // CHECK:   %[[THIS:.*]] = load %struct.GrandchildOverride*, %struct.GrandchildOverride**
186   // CHECK:   %[[VFPTR:.*]] = bitcast %struct.GrandchildOverride* %[[THIS]] to i32 (...)***
187   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"??_7GrandchildOverride@@6BLeft@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
188   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.GrandchildOverride* %[[THIS]] to i8*
189   // CHECK:   %[[VFPTR_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 4
190   // CHECK:   %[[VFPTR:.*]] = bitcast i8* %[[VFPTR_i8]] to i32 (...)***
191   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"??_7GrandchildOverride@@6BRight@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
192   // CHECK: ret
193 }
194 
195 struct LeftWithNonVirtualDtor {
196   virtual void left();
197   ~LeftWithNonVirtualDtor();
198 };
199 
200 struct AsymmetricChild : LeftWithNonVirtualDtor, Right {
201   virtual ~AsymmetricChild();
202 };
203 
204 void call_asymmetric_child_complete_dtor() {
205   // CHECK-LABEL: define dso_local void @"?call_asymmetric_child_complete_dtor@@YAXXZ"
206   AsymmetricChild obj;
207   // CHECK: call x86_thiscallcc noundef %struct.AsymmetricChild* @"??0AsymmetricChild@@QAE@XZ"(%struct.AsymmetricChild* {{[^,]*}} %[[OBJ:.*]])
208   // CHECK-NOT: getelementptr
209   // CHECK: call x86_thiscallcc void @"??1AsymmetricChild@@UAE@XZ"(%struct.AsymmetricChild* {{[^,]*}} %[[OBJ]])
210   // CHECK: ret
211 }
212