1 // Member pointer to virtual function.
2
3 // RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O3 -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s
4
5 // CHECK: define void @_Z4funcP1AMS_FvvE(%class.A* %a, [2 x i64] %fn.coerce) local_unnamed_addr
6 // CHECK-NEXT: entry:
7 // CHECK-NEXT: [[fn_ptr:%.+]] = extractvalue [2 x i64] %fn.coerce, 0
8 // CHECK-NEXT: [[adjust:%.+]] = extractvalue [2 x i64] %fn.coerce, 1
9 // CHECK-NEXT: [[this:%.+]] = bitcast %class.A* %a to i8*
10 // CHECK-NEXT: [[this_adj:%.+]] = getelementptr inbounds i8, i8* [[this]], i64 [[adjust]]
11 // CHECK-NEXT: [[virtbit:%.+]] = and i64 [[fn_ptr]], 1
12 // CHECK-NEXT: [[isvirt:%.+]] = icmp eq i64 [[virtbit]], 0
13 // CHECK-NEXT: br i1 [[isvirt]], label %[[nonvirt:.+]], label %[[virt:.+]]
14 // CHECK: [[virt]]:
15
16 // The loading of the virtual function here should be replaced with a llvm.load.relative() call.
17 // CHECK-NEXT: [[this:%.+]] = bitcast i8* [[this_adj]] to i8**
18 // CHECK-NEXT: [[vtable:%.+]] = load i8*, i8** [[this]], align 8
19 // CHECK-NEXT: [[offset:%.+]] = add i64 [[fn_ptr]], -1
20 // CHECK-NEXT: [[ptr:%.+]] = tail call i8* @llvm.load.relative.i64(i8* [[vtable]], i64 [[offset]])
21 // CHECK-NEXT: [[method:%.+]] = bitcast i8* [[ptr]] to void (%class.A*)*
22 // CHECK-NEXT: br label %[[memptr_end:.+]]
23 // CHECK: [[nonvirt]]:
24 // CHECK-NEXT: [[method2:%.+]] = inttoptr i64 [[fn_ptr]] to void (%class.A*)*
25 // CHECK-NEXT: br label %[[memptr_end]]
26 // CHECK: [[memptr_end]]:
27 // CHECK-NEXT: [[method3:%.+]] = phi void (%class.A*)* [ [[method]], %[[virt]] ], [ [[method2]], %[[nonvirt]] ]
28 // CHECK-NEXT: [[a:%.+]] = bitcast i8* [[this_adj]] to %class.A*
29 // CHECK-NEXT: tail call void [[method3]](%class.A* {{[^,]*}} [[a]])
30 // CHECK-NEXT: ret void
31 // CHECK-NEXT: }
32
33 class A {
34 public:
35 virtual void foo();
36 };
37
38 class B : public A {
39 public:
40 void foo() override;
41 };
42
43 typedef void (A::*A_foo)();
44
func(A * a,A_foo fn)45 void func(A *a, A_foo fn) {
46 (a->*fn)();
47 }
48