1 // RUN: %clang_cc1 -fno-rtti-data -triple x86_64-windows-msvc -emit-llvm %s -o - | FileCheck %s
2
3 // In this example, C does not override B::foo, but it needs to emit a thunk to
4 // adjust for the relative difference of position between A-in-B and A-in-C.
5
6 struct Incomplete;
7 template <typename T>
8 struct DoNotInstantiate {
9 typename T::does_not_exist field;
10 };
11 template <typename T>
12 struct InstantiateLater;
13
14 struct A {
15 virtual void foo(Incomplete p) = 0;
16 virtual void bar(DoNotInstantiate<int> p) = 0;
17 virtual int baz(InstantiateLater<int> p) = 0;
18 };
19 struct B : virtual A {
20 void foo(Incomplete p) override;
21 void bar(DoNotInstantiate<int> p) override;
22 inline int baz(InstantiateLater<int> p) override;
23 };
24 struct C : B { int c; };
25 C c;
26
27 // Do the same thing, but with an incomplete return type.
28 struct B1 { virtual DoNotInstantiate<void> f() = 0; };
29 struct B2 { virtual DoNotInstantiate<void> f() = 0; };
30 struct S : B1, B2 { DoNotInstantiate<void> f() override; };
31 S s;
32
33 // CHECK: @"??_7S@@6BB2@@@" = linkonce_odr unnamed_addr constant
34 // CHECK-SAME: void (%struct.S*, ...)* @"?f@S@@W7EAA?AU?$DoNotInstantiate@X@@XZ"
35
36 // CHECK: @"??_7C@@6B@" = linkonce_odr unnamed_addr constant
37 // CHECK-SAME: void (%struct.B*, ...)* @"?foo@B@@W7EAAXUIncomplete@@@Z"
38 // CHECK-SAME: void (%struct.B*, ...)* @"?bar@B@@W7EAAXU?$DoNotInstantiate@H@@@Z"
39 // CHECK-SAME: i32 (i8*, i32)* @"?baz@B@@W7EAAHU?$InstantiateLater@H@@@Z"
40
41
42 // CHECK-LABEL: define linkonce_odr dso_local void @"?f@S@@W7EAA?AU?$DoNotInstantiate@X@@XZ"(%struct.S* %this, ...)
43 // CHECK: %[[THIS_ADJ_i8:[^ ]*]] = getelementptr i8, i8* {{.*}}, i32 -8
44 // CHECK: %[[THIS_ADJ:[^ ]*]] = bitcast i8* %[[THIS_ADJ_i8]] to %struct.S*
45 // CHECK: musttail call void (%struct.S*, ...) {{.*}}@"?f@S@@UEAA?AU?$DoNotInstantiate@X@@XZ"
46 // CHECK-SAME: (%struct.S* %[[THIS_ADJ]], ...)
47 // CHECK: ret void
48
49 // The thunks should have a -8 adjustment.
50
51 // CHECK-LABEL: define linkonce_odr dso_local void @"?foo@B@@W7EAAXUIncomplete@@@Z"(%struct.B* %this, ...)
52 // CHECK: %[[THIS_ADJ_i8:[^ ]*]] = getelementptr i8, i8* {{.*}}, i32 -8
53 // CHECK: %[[THIS_ADJ:[^ ]*]] = bitcast i8* %[[THIS_ADJ_i8]] to %struct.B*
54 // CHECK: musttail call void (%struct.B*, ...) {{.*}}@"?foo@B@@UEAAXUIncomplete@@@Z"
55 // CHECK-SAME: (%struct.B* %[[THIS_ADJ]], ...)
56 // CHECK-NEXT: ret void
57
58 // CHECK-LABEL: define linkonce_odr dso_local void @"?bar@B@@W7EAAXU?$DoNotInstantiate@H@@@Z"(%struct.B* %this, ...)
59 // CHECK: %[[THIS_ADJ_i8:[^ ]*]] = getelementptr i8, i8* {{.*}}, i32 -8
60 // CHECK: %[[THIS_ADJ:[^ ]*]] = bitcast i8* %[[THIS_ADJ_i8]] to %struct.B*
61 // CHECK: musttail call void (%struct.B*, ...) {{.*}}@"?bar@B@@UEAAXU?$DoNotInstantiate@H@@@Z"
62 // CHECK-SAME: (%struct.B* %[[THIS_ADJ]], ...)
63 // CHECK-NEXT: ret void
64
65 // If we complete the definition later, things work out.
66 template <typename T> struct InstantiateLater { T x; };
baz(InstantiateLater<int> p)67 inline int B::baz(InstantiateLater<int> p) { return p.x; }
68
69 // CHECK-LABEL: define linkonce_odr dso_local i32 @"?baz@B@@W7EAAHU?$InstantiateLater@H@@@Z"(i8* %this.coerce, i32 %p.coerce)
70 // CHECK: = getelementptr i8, i8* {{.*}}, i32 -8
71 // CHECK: tail call i32 @"?baz@B@@UEAAHU?$InstantiateLater@H@@@Z"(i8* {{[^,]*}}, i32 {{.*}})
72
73 // CHECK-LABEL: define linkonce_odr dso_local i32 @"?baz@B@@UEAAHU?$InstantiateLater@H@@@Z"(i8* %this.coerce, i32 %p.coerce)
74