xref: /minix3/external/bsd/llvm/dist/clang/test/CodeGenCXX/microsoft-abi-dynamic-cast.cpp (revision 0a6a1f1d05b60e214de2f05a7310ddd1f0e590e7)

// RUN: %clang_cc1 -emit-llvm -O1 -o - -triple=i386-pc-win32 %s | FileCheck %s

struct S { char a; };
struct V { virtual void f(); };
struct A : virtual V {};
struct B : S, virtual V {};
struct T {};

T* test0() { return dynamic_cast<T*>((B*)0); }
// CHECK-LABEL: define noalias %struct.T* @"\01?test0@@YAPAUT@@XZ"()
// CHECK:   ret %struct.T* null

T* test1(V* x) { return &dynamic_cast<T&>(*x); }
// CHECK-LABEL: define %struct.T* @"\01?test1@@YAPAUT@@PAUV@@@Z"(%struct.V* %x)
// CHECK:        [[CAST:%.*]] = bitcast %struct.V* %x to i8*
// CHECK-NEXT:   [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[CAST]], i32 0, i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUV@@@8" to i8*), i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUT@@@8" to i8*), i32 1)
// CHECK-NEXT:   [[RET:%.*]] = bitcast i8* [[CALL]] to %struct.T*
// CHECK-NEXT:   ret %struct.T* [[RET]]

T* test2(A* x) { return &dynamic_cast<T&>(*x); }
// CHECK-LABEL: define %struct.T* @"\01?test2@@YAPAUT@@PAUA@@@Z"(%struct.A* %x)
// CHECK:        [[CAST:%.*]] = bitcast %struct.A* %x to i8*
// CHECK-NEXT:   [[VBPTRPTR:%.*]] = getelementptr inbounds %struct.A* %x, i32 0, i32 0
// CHECK-NEXT:   [[VBTBL:%.*]] = load i32** [[VBPTRPTR]], align 4
// CHECK-NEXT:   [[VBOFFP:%.*]] = getelementptr inbounds i32* [[VBTBL]], i32 1
// CHECK-NEXT:   [[VBOFFS:%.*]] = load i32* [[VBOFFP]], align 4
// CHECK-NEXT:   [[ADJ:%.*]] = getelementptr inbounds i8* [[CAST]], i32 [[VBOFFS]]
// CHECK-NEXT:   [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[ADJ]], i32 [[VBOFFS]], i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUA@@@8" to i8*), i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUT@@@8" to i8*), i32 1)
// CHECK-NEXT:   [[RET:%.*]] = bitcast i8* [[CALL]] to %struct.T*
// CHECK-NEXT:   ret %struct.T* [[RET]]

T* test3(B* x) { return &dynamic_cast<T&>(*x); }
// CHECK-LABEL: define %struct.T* @"\01?test3@@YAPAUT@@PAUB@@@Z"(%struct.B* %x)
// CHECK:        [[VOIDP:%.*]] = getelementptr inbounds %struct.B* %x, i32 0, i32 0, i32 0
// CHECK-NEXT:   [[VBPTR:%.*]] = getelementptr inbounds i8* [[VOIDP]], i32 4
// CHECK-NEXT:   [[VBPTRPTR:%.*]] = bitcast i8* [[VBPTR:%.*]] to i32**
// CHECK-NEXT:   [[VBTBL:%.*]] = load i32** [[VBPTRPTR]], align 4
// CHECK-NEXT:   [[VBOFFP:%.*]] = getelementptr inbounds i32* [[VBTBL]], i32 1
// CHECK-NEXT:   [[VBOFFS:%.*]] = load i32* [[VBOFFP]], align 4
// CHECK-NEXT:   [[DELTA:%.*]] = add nsw i32 [[VBOFFS]], 4
// CHECK-NEXT:   [[ADJ:%.*]] = getelementptr inbounds i8* [[VOIDP]], i32 [[DELTA]]
// CHECK-NEXT:   [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[ADJ]], i32 [[DELTA]], i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUB@@@8" to i8*), i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUT@@@8" to i8*), i32 1)
// CHECK-NEXT:   [[RET:%.*]] = bitcast i8* [[CALL]] to %struct.T*
// CHECK-NEXT:   ret %struct.T* [[RET]]

T* test4(V* x) { return dynamic_cast<T*>(x); }
// CHECK-LABEL: define %struct.T* @"\01?test4@@YAPAUT@@PAUV@@@Z"(%struct.V* %x)
// CHECK:        [[CAST:%.*]] = bitcast %struct.V* %x to i8*
// CHECK-NEXT:   [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[CAST]], i32 0, i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUV@@@8" to i8*), i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUT@@@8" to i8*), i32 0)
// CHECK-NEXT:   [[RET:%.*]] = bitcast i8* [[CALL]] to %struct.T*
// CHECK-NEXT:   ret %struct.T* [[RET]]

T* test5(A* x) { return dynamic_cast<T*>(x); }
// CHECK-LABEL: define %struct.T* @"\01?test5@@YAPAUT@@PAUA@@@Z"(%struct.A* %x)
// CHECK:        [[CHECK:%.*]] = icmp eq %struct.A* %x, null
// CHECK-NEXT:   br i1 [[CHECK]]
// CHECK:        [[VOIDP:%.*]] = bitcast %struct.A* %x to i8*
// CHECK-NEXT:   [[VBPTRPTR:%.*]] = getelementptr inbounds %struct.A* %x, i32 0, i32 0
// CHECK-NEXT:   [[VBTBL:%.*]] = load i32** [[VBPTRPTR]], align 4
// CHECK-NEXT:   [[VBOFFP:%.*]] = getelementptr inbounds i32* [[VBTBL]], i32 1
// CHECK-NEXT:   [[VBOFFS:%.*]] = load i32* [[VBOFFP]], align 4
// CHECK-NEXT:   [[ADJ:%.*]] = getelementptr inbounds i8* [[VOIDP]], i32 [[VBOFFS]]
// CHECK-NEXT:   [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[ADJ]], i32 [[VBOFFS]], i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUA@@@8" to i8*), i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUT@@@8" to i8*), i32 0)
// CHECK-NEXT:   [[RES:%.*]] = bitcast i8* [[CALL]] to %struct.T*
// CHECK-NEXT:   br label
// CHECK:        [[RET:%.*]] = phi %struct.T*
// CHECK-NEXT:   ret %struct.T* [[RET]]

T* test6(B* x) { return dynamic_cast<T*>(x); }
// CHECK-LABEL: define %struct.T* @"\01?test6@@YAPAUT@@PAUB@@@Z"(%struct.B* %x)
// CHECK:        [[CHECK:%.*]] = icmp eq %struct.B* %x, null
// CHECK-NEXT:   br i1 [[CHECK]]
// CHECK:        [[CAST:%.*]] = getelementptr inbounds %struct.B* %x, i32 0, i32 0, i32 0
// CHECK-NEXT:   [[VBPTR:%.*]] = getelementptr inbounds i8* [[CAST]], i32 4
// CHECK-NEXT:   [[VBPTRPTR:%.*]] = bitcast i8* [[VBPTR]] to i32**
// CHECK-NEXT:   [[VBTBL:%.*]] = load i32** [[VBPTRPTR]], align 4
// CHECK-NEXT:   [[VBOFFP:%.*]] = getelementptr inbounds i32* [[VBTBL]], i32 1
// CHECK-NEXT:   [[VBOFFS:%.*]] = load i32* [[VBOFFP]], align 4
// CHECK-NEXT:   [[DELTA:%.*]] = add nsw i32 [[VBOFFS]], 4
// CHECK-NEXT:   [[ADJ:%.*]] = getelementptr inbounds i8* [[CAST]], i32 [[DELTA]]
// CHECK-NEXT:   [[CALL:%.*]] = tail call i8* @__RTDynamicCast(i8* [[ADJ]], i32 [[DELTA]], i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUB@@@8" to i8*), i8* bitcast (%rtti.TypeDescriptor7* @"\01??_R0?AUT@@@8" to i8*), i32 0)
// CHECK-NEXT:   [[RES:%.*]] = bitcast i8* [[CALL]] to %struct.T*
// CHECK-NEXT:   br label
// CHECK:        [[RET:%.*]] = phi %struct.T*
// CHECK-NEXT:   ret %struct.T* [[RET]]

void* test7(V* x) { return dynamic_cast<void*>(x); }
// CHECK-LABEL: define i8* @"\01?test7@@YAPAXPAUV@@@Z"(%struct.V* %x)
// CHECK:        [[CAST:%.*]] = bitcast %struct.V* %x to i8*
// CHECK-NEXT:   [[RET:%.*]] = tail call i8* @__RTCastToVoid(i8* [[CAST]])
// CHECK-NEXT:   ret i8* [[RET]]

void* test8(A* x) { return dynamic_cast<void*>(x); }
// CHECK-LABEL: define i8* @"\01?test8@@YAPAXPAUA@@@Z"(%struct.A* %x)
// CHECK:        [[CHECK:%.*]] = icmp eq %struct.A* %x, null
// CHECK-NEXT:   br i1 [[CHECK]]
// CHECK:        [[VOIDP:%.*]] = bitcast %struct.A* %x to i8*
// CHECK-NEXT:   [[VBPTRPTR:%.*]] = getelementptr inbounds %struct.A* %x, i32 0, i32 0
// CHECK-NEXT:   [[VBTBL:%.*]] = load i32** [[VBPTRPTR]], align 4
// CHECK-NEXT:   [[VBOFFP:%.*]] = getelementptr inbounds i32* [[VBTBL]], i32 1
// CHECK-NEXT:   [[VBOFFS:%.*]] = load i32* [[VBOFFP]], align 4
// CHECK-NEXT:   [[ADJ:%.*]] = getelementptr inbounds i8* [[VOIDP]], i32 [[VBOFFS]]
// CHECK-NEXT:   [[RES:%.*]] = tail call i8* @__RTCastToVoid(i8* [[ADJ]])
// CHECK-NEXT:   br label
// CHECK:        [[RET:%.*]] = phi i8*
// CHECK-NEXT:   ret i8* [[RET]]

void* test9(B* x) { return dynamic_cast<void*>(x); }
// CHECK-LABEL: define i8* @"\01?test9@@YAPAXPAUB@@@Z"(%struct.B* %x)
// CHECK:        [[CHECK:%.*]] = icmp eq %struct.B* %x, null
// CHECK-NEXT:   br i1 [[CHECK]]
// CHECK:        [[CAST:%.*]] = getelementptr inbounds %struct.B* %x, i32 0, i32 0, i32 0
// CHECK-NEXT:   [[VBPTR:%.*]] = getelementptr inbounds i8* [[CAST]], i32 4
// CHECK-NEXT:   [[VBPTRPTR:%.*]] = bitcast i8* [[VBPTR]] to i32**
// CHECK-NEXT:   [[VBTBL:%.*]] = load i32** [[VBPTRPTR]], align 4
// CHECK-NEXT:   [[VBOFFP:%.*]] = getelementptr inbounds i32* [[VBTBL]], i32 1
// CHECK-NEXT:   [[VBOFFS:%.*]] = load i32* [[VBOFFP]], align 4
// CHECK-NEXT:   [[DELTA:%.*]] = add nsw i32 [[VBOFFS]], 4
// CHECK-NEXT:   [[ADJ:%.*]] = getelementptr inbounds i8* [[CAST]], i32 [[DELTA]]
// CHECK-NEXT:   [[CALL:%.*]] = tail call i8* @__RTCastToVoid(i8* [[ADJ]])
// CHECK-NEXT:   br label
// CHECK:        [[RET:%.*]] = phi i8*
// CHECK-NEXT:   ret i8* [[RET]]