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 void @"\01?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 x86_thiscallcc void @"\01?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* %[[THIS_i8]])
48 // CHECK: ret
49 }
50 
51 void call_left_override(ChildOverride *child) {
52 // CHECK-LABEL: define void @"\01?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 void @"\01?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 x86_thiscallcc void @"\01?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_ADDR:.*]] = alloca %struct.ChildOverride*, align 4
92 // CHECK: %[[THIS_INIT:.*]] = bitcast i8* %[[ECX:.*]] to %struct.ChildOverride*
93 // CHECK: store %struct.ChildOverride* %[[THIS_INIT]], %struct.ChildOverride** %[[THIS_ADDR]], align 4
94 // CHECK: %[[THIS_RELOAD:.*]] = load %struct.ChildOverride*, %struct.ChildOverride** %[[THIS_ADDR]]
95 // CHECK: %[[THIS_i8:.*]] = bitcast %struct.ChildOverride* %[[THIS_RELOAD]] to i8*
96 // CHECK: %[[THIS_ADJUSTED:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 -4
97 // CHECK: %[[THIS:.*]] = bitcast i8* %[[THIS_ADJUSTED]] to %struct.ChildOverride*
98 
99   foo(this);
100 // CHECK: %[[THIS_PARAM:.*]] = bitcast %struct.ChildOverride* %[[THIS]] to i8*
101 // CHECK: call void @foo(i8* %[[THIS_PARAM]])
102 // CHECK: ret
103 }
104 
105 void call_right_override(ChildOverride *child) {
106 // CHECK-LABEL: define void @"\01?call_right_override
107 // CHECK: %[[CHILD:.*]] = load %struct.ChildOverride
108 
109   child->right();
110 // When calling a right child's virtual method, one needs to adjust 'this' at
111 // the caller site.
112 //
113 // CHECK: %[[CHILD_i8:.*]] = bitcast %struct.ChildOverride* %[[CHILD]] to i8*
114 //
115 // CHECK: %[[VFPTR_i8:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
116 // CHECK: %[[VFPTR:.*]] = bitcast i8* %[[VFPTR_i8]] to void (i8*)***
117 // CHECK: %[[VFTABLE:.*]] = load void (i8*)**, void (i8*)*** %[[VFPTR]]
118 // CHECK: %[[VFUN:.*]] = getelementptr inbounds void (i8*)*, void (i8*)** %[[VFTABLE]], i64 0
119 // CHECK: %[[VFUN_VALUE:.*]] = load void (i8*)*, void (i8*)** %[[VFUN]]
120 //
121 // CHECK: %[[CHILD_i8:.*]] = bitcast %struct.ChildOverride* %[[CHILD]] to i8*
122 // CHECK: %[[RIGHT:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
123 //
124 // CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](i8* %[[RIGHT]])
125 // CHECK: ret
126 }
127 
128 struct GrandchildOverride : ChildOverride {
129   virtual void right();
130 };
131 
132 void GrandchildOverride::right() {
133 // CHECK-LABEL: define x86_thiscallcc void @"\01?right@GrandchildOverride@@UAEXXZ"(i8*
134 //
135 // CHECK: %[[THIS_ADDR:.*]] = alloca %struct.GrandchildOverride*, align 4
136 // CHECK: %[[THIS_INIT:.*]] = bitcast i8* %[[ECX:.*]] to %struct.GrandchildOverride*
137 // CHECK: store %struct.GrandchildOverride* %[[THIS_INIT]], %struct.GrandchildOverride** %[[THIS_ADDR]], align 4
138 // CHECK: %[[THIS_RELOAD:.*]] = load %struct.GrandchildOverride*, %struct.GrandchildOverride** %[[THIS_ADDR]]
139 // CHECK: %[[THIS_i8:.*]] = bitcast %struct.GrandchildOverride* %[[THIS_RELOAD]] to i8*
140 // CHECK: %[[THIS_ADJUSTED:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 -4
141 // CHECK: %[[THIS:.*]] = bitcast i8* %[[THIS_ADJUSTED]] to %struct.GrandchildOverride*
142 
143   foo(this);
144 // CHECK: %[[THIS_PARAM:.*]] = bitcast %struct.GrandchildOverride* %[[THIS]] to i8*
145 // CHECK: call void @foo(i8* %[[THIS_PARAM]])
146 // CHECK: ret
147 }
148 
149 void call_grandchild_right(GrandchildOverride *obj) {
150   // Just make sure we don't crash.
151   obj->right();
152 }
153 
154 void emit_ctors() {
155   Left l;
156   // CHECK-LABEL: define {{.*}} @"\01??0Left@@QAE@XZ"
157   // CHECK-NOT: getelementptr
158   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7Left@@6B@" to i32 (...)**)
159   // CHECK: ret
160 
161   Right r;
162   // CHECK-LABEL: define {{.*}} @"\01??0Right@@QAE@XZ"
163   // CHECK-NOT: getelementptr
164   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7Right@@6B@" to i32 (...)**)
165   // CHECK: ret
166 
167   ChildOverride co;
168   // CHECK-LABEL: define {{.*}} @"\01??0ChildOverride@@QAE@XZ"
169   // CHECK:   %[[THIS:.*]] = load %struct.ChildOverride*, %struct.ChildOverride**
170   // CHECK:   %[[VFPTR:.*]] = bitcast %struct.ChildOverride* %[[THIS]] to i32 (...)***
171   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7ChildOverride@@6BLeft@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
172   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.ChildOverride* %[[THIS]] to i8*
173   // CHECK:   %[[VFPTR_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 4
174   // CHECK:   %[[VFPTR:.*]] = bitcast i8* %[[VFPTR_i8]] to i32 (...)***
175   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7ChildOverride@@6BRight@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
176   // CHECK: ret
177 
178   GrandchildOverride gc;
179   // CHECK-LABEL: define {{.*}} @"\01??0GrandchildOverride@@QAE@XZ"
180   // CHECK:   %[[THIS:.*]] = load %struct.GrandchildOverride*, %struct.GrandchildOverride**
181   // CHECK:   %[[VFPTR:.*]] = bitcast %struct.GrandchildOverride* %[[THIS]] to i32 (...)***
182   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7GrandchildOverride@@6BLeft@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
183   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.GrandchildOverride* %[[THIS]] to i8*
184   // CHECK:   %[[VFPTR_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 4
185   // CHECK:   %[[VFPTR:.*]] = bitcast i8* %[[VFPTR_i8]] to i32 (...)***
186   // CHECK:   store i32 (...)** bitcast ({ [1 x i8*] }* @"\01??_7GrandchildOverride@@6BRight@@@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
187   // CHECK: ret
188 }
189 
190 struct LeftWithNonVirtualDtor {
191   virtual void left();
192   ~LeftWithNonVirtualDtor();
193 };
194 
195 struct AsymmetricChild : LeftWithNonVirtualDtor, Right {
196   virtual ~AsymmetricChild();
197 };
198 
199 void call_asymmetric_child_complete_dtor() {
200   // CHECK-LABEL: define void @"\01?call_asymmetric_child_complete_dtor@@YAXXZ"
201   AsymmetricChild obj;
202   // CHECK: call x86_thiscallcc %struct.AsymmetricChild* @"\01??0AsymmetricChild@@QAE@XZ"(%struct.AsymmetricChild* %[[OBJ:.*]])
203   // CHECK-NOT: getelementptr
204   // CHECK: call x86_thiscallcc void @"\01??1AsymmetricChild@@UAE@XZ"(%struct.AsymmetricChild* %[[OBJ]])
205   // CHECK: ret
206 }
207