44 lines · cpp
1// Member pointer to virtual function.2 3// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O3 -o - -emit-llvm | FileCheck %s4 5// CHECK: define{{.*}} void @_Z4funcP1AMS_FvvE(ptr noundef %a, [2 x i64] %fn.coerce) local_unnamed_addr6// CHECK-NEXT: entry:7// CHECK-NEXT: [[fn_ptr:%.+]] = extractvalue [2 x i64] %fn.coerce, 08// CHECK-NEXT: [[adjust:%.+]] = extractvalue [2 x i64] %fn.coerce, 19// CHECK-NEXT: [[this_adj:%.+]] = getelementptr inbounds i8, ptr %a, i64 [[adjust]]10// CHECK-NEXT: [[virtbit:%.+]] = and i64 [[fn_ptr]], 111// CHECK-NEXT: [[isvirt:%.+]] = icmp eq i64 [[virtbit]], 012// CHECK-NEXT: br i1 [[isvirt]], label %[[nonvirt:.+]], label %[[virt:.+]]13// CHECK: [[virt]]:14 15// The loading of the virtual function here should be replaced with a llvm.load.relative() call.16// CHECK-NEXT: [[vtable:%.+]] = load ptr, ptr [[this_adj]], align 817// CHECK-NEXT: [[offset:%.+]] = add nsw i64 [[fn_ptr]], -118// CHECK-NEXT: [[ptr:%.+]] = tail call ptr @llvm.load.relative.i64(ptr [[vtable]], i64 [[offset]])19// CHECK-NEXT: br label %[[memptr_end:.+]]20// CHECK: [[nonvirt]]:21// CHECK-NEXT: [[method2:%.+]] = inttoptr i64 [[fn_ptr]] to ptr22// CHECK-NEXT: br label %[[memptr_end]]23// CHECK: [[memptr_end]]:24// CHECK-NEXT: [[method3:%.+]] = phi ptr [ [[ptr]], %[[virt]] ], [ [[method2]], %[[nonvirt]] ]25// CHECK-NEXT: tail call void [[method3]](ptr {{[^,]*}} [[this_adj]])26// CHECK-NEXT: ret void27// CHECK-NEXT: }28 29class A {30public:31 virtual void foo();32};33 34class B : public A {35public:36 void foo() override;37};38 39typedef void (A::*A_foo)();40 41void func(A *a, A_foo fn) {42 (a->*fn)();43}44