48 lines
1.9 KiB
C++
48 lines
1.9 KiB
C++
|
// Member pointer to virtual function.
|
||
|
|
|
||
|
|
// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O3 -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s
|
||
|
|
|
||
|
|
// CHECK: define{{.*}} void @_Z4funcP1AMS_FvvE(%class.A* %a, [2 x i64] %fn.coerce) local_unnamed_addr
|
||
|
|
// CHECK-NEXT: entry:
|
||
|
|
// CHECK-NEXT: [[fn_ptr:%.+]] = extractvalue [2 x i64] %fn.coerce, 0
|
||
|
|
// CHECK-NEXT: [[adjust:%.+]] = extractvalue [2 x i64] %fn.coerce, 1
|
||
|
|
// CHECK-NEXT: [[this:%.+]] = bitcast %class.A* %a to i8*
|
||
|
|
// CHECK-NEXT: [[this_adj:%.+]] = getelementptr inbounds i8, i8* [[this]], i64 [[adjust]]
|
||
|
|
// CHECK-NEXT: [[virtbit:%.+]] = and i64 [[fn_ptr]], 1
|
||
|
|
// CHECK-NEXT: [[isvirt:%.+]] = icmp eq i64 [[virtbit]], 0
|
||
|
|
// CHECK-NEXT: br i1 [[isvirt]], label %[[nonvirt:.+]], label %[[virt:.+]]
|
||
|
|
// CHECK: [[virt]]:
|
||
|
|
|
||
|
|
// The loading of the virtual function here should be replaced with a llvm.load.relative() call.
|
||
|
|
// CHECK-NEXT: [[this:%.+]] = bitcast i8* [[this_adj]] to i8**
|
||
|
|
// CHECK-NEXT: [[vtable:%.+]] = load i8*, i8** [[this]], align 8
|
||
|
|
// CHECK-NEXT: [[offset:%.+]] = add i64 [[fn_ptr]], -1
|
||
|
|
// CHECK-NEXT: [[ptr:%.+]] = tail call i8* @llvm.load.relative.i64(i8* [[vtable]], i64 [[offset]])
|
||
|
|
// CHECK-NEXT: [[method:%.+]] = bitcast i8* [[ptr]] to void (%class.A*)*
|
||
|
|
// CHECK-NEXT: br label %[[memptr_end:.+]]
|
||
|
|
// CHECK: [[nonvirt]]:
|
||
|
|
// CHECK-NEXT: [[method2:%.+]] = inttoptr i64 [[fn_ptr]] to void (%class.A*)*
|
||
|
|
// CHECK-NEXT: br label %[[memptr_end]]
|
||
|
|
// CHECK: [[memptr_end]]:
|
||
|
|
// CHECK-NEXT: [[method3:%.+]] = phi void (%class.A*)* [ [[method]], %[[virt]] ], [ [[method2]], %[[nonvirt]] ]
|
||
|
|
// CHECK-NEXT: [[a:%.+]] = bitcast i8* [[this_adj]] to %class.A*
|
||
|
|
// CHECK-NEXT: tail call void [[method3]](%class.A* {{[^,]*}} [[a]])
|
||
|
|
// CHECK-NEXT: ret void
|
||
|
|
// CHECK-NEXT: }
|
||
|
|
|
||
|
|
class A {
|
||
|
|
public:
|
||
|
|
virtual void foo();
|
||
|
|
};
|
||
|
|
|
||
|
|
class B : public A {
|
||
|
|
public:
|
||
|
|
void foo() override;
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef void (A::*A_foo)();
|
||
|
|
|
||
|
|
void func(A *a, A_foo fn) {
|
||
|
|
(a->*fn)();
|
||
|
|
}
|