1 // RUN: %clang_cc1 -fno-rtti -emit-llvm %s -o - -mconstructor-aliases -triple=i386-pc-win32 | FileCheck %s
2 // RUN: %clang_cc1 -fno-rtti -emit-llvm %s -o - -mconstructor-aliases -triple=i386-pc-win32 -fno-delete-null-pointer-checks | FileCheck %s
3
4 struct Left {
5 virtual void left();
6 };
7
8 struct Right {
9 virtual void right();
10 };
11
12 struct ChildNoOverride : Left, Right {
13 };
14
15 struct ChildOverride : Left, Right {
16 virtual void left();
17 virtual void right();
18 };
19
20 extern "C" void foo(void *);
21
call_left_no_override(ChildNoOverride * child)22 void call_left_no_override(ChildNoOverride *child) {
23 // CHECK: %[[CHILD:.*]] = load %struct.ChildNoOverride
24 child->left();
25 }
26
left()27 void ChildOverride::left() {}
28
call_right_no_override(ChildNoOverride * child)29 void call_right_no_override(ChildNoOverride *child) {
30 child->right();
31 // When calling a right base's virtual method, one needs to adjust `this` at the caller site.
32 //
33 // CHECK: %[[CHILD_i8:.*]] = bitcast %struct.ChildNoOverride* %[[CHILD]] to i8*
34 // CHECK: %[[RIGHT_i8:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
35 // CHECK: %[[RIGHT:.*]] = bitcast i8* %[[RIGHT_i8]] to %struct.Right*
36 //
37 // CHECK: %[[VFPTR:.*]] = bitcast %struct.Right* %[[RIGHT]] to void (%struct.Right*)***
38 // CHECK: %[[VFTABLE:.*]] = load void (%struct.Right*)**, void (%struct.Right*)*** %[[VFPTR]]
39 // CHECK: %[[VFUN:.*]] = getelementptr inbounds void (%struct.Right*)*, void (%struct.Right*)** %[[VFTABLE]], i64 0
40 }
41
right()42 void ChildOverride::right() {
43 foo(this);
44 }
45
call_right_override(ChildOverride * child)46 void call_right_override(ChildOverride *child) {
47 child->right();
48 // Ensure that `nonnull` and `dereferenceable(N)` are not emitted whether or not null is valid
49 //
50 // CHECK: %[[RIGHT:.*]] = getelementptr inbounds i8, i8* %[[CHILD_i8]], i32 4
51 // CHECK: %[[VFUN_VALUE:.*]] = load void (i8*)*, void (i8*)** %[[VFUN]]
52 // CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](i8* %[[RIGHT]])
53 }
54