1// RUN: %clang_cc1 -emit-llvm %s -o - -triple i686-pc-linux-gnu | FileCheck %s
2// RUN: %clang_cc1 -emit-llvm %s -o - -triple i686-pc-win32 | FileCheck -check-prefix MSVC %s
3
4struct A { int a; virtual int aa(); };
5struct B { int b; virtual int bb(); };
6struct C : virtual A, virtual B { int c; virtual int aa(); virtual int bb(); };
7struct AA { int a; virtual int aa(); };
8struct BB { int b; virtual int bb(); };
9struct CC : AA, BB { virtual int aa(); virtual int bb(); virtual int cc(); };
10struct D : virtual C, virtual CC { int e; };
11
12D* x;
13
14A* a() { return x; }
15// CHECK: @_Z1av() [[NUW:#[0-9]+]]
16// CHECK: [[VBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = getelementptr i8, i8* {{.*}}, i64 -16
17// CHECK: [[CASTVBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = bitcast i8* [[VBASEOFFSETPTRA]] to i32*
18// CHECK: load i32, i32* [[CASTVBASEOFFSETPTRA]]
19// CHECK: }
20
21// MSVC: @"\01?a@@YAPAUA@@XZ"() [[NUW:#[0-9]+]] {
22// MSVC:   %[[vbptr_off:.*]] = getelementptr inbounds i8, i8* {{.*}}, i32 0
23// MSVC:   %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to i32**
24// MSVC:   %[[vbtable:.*]] = load i32*, i32** %[[vbptr]]
25// MSVC:   %[[entry:.*]] = getelementptr inbounds i32, i32* {{.*}}, i32 1
26// MSVC:   %[[offset:.*]] = load i32, i32* %[[entry]]
27// MSVC:   add nsw i32 0, %[[offset]]
28// MSVC: }
29
30B* b() { return x; }
31// CHECK: @_Z1bv() [[NUW]]
32// CHECK: [[VBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = getelementptr i8, i8* {{.*}}, i64 -20
33// CHECK: [[CASTVBASEOFFSETPTRA:%[a-zA-Z0-9\.]+]] = bitcast i8* [[VBASEOFFSETPTRA]] to i32*
34// CHECK: load i32, i32* [[CASTVBASEOFFSETPTRA]]
35// CHECK: }
36
37// Same as 'a' except we use a different vbtable offset.
38// MSVC: @"\01?b@@YAPAUB@@XZ"() [[NUW:#[0-9]+]] {
39// MSVC:   %[[vbptr_off:.*]] = getelementptr inbounds i8, i8* {{.*}}, i32 0
40// MSVC:   %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to i32**
41// MSVC:   %[[vbtable:.*]] = load i32*, i32** %[[vbptr]]
42// MSVC:   %[[entry:.*]] = getelementptr inbounds i32, i32* {{.*}}, i32 2
43// MSVC:   %[[offset:.*]] = load i32, i32* %[[entry]]
44// MSVC:   add nsw i32 0, %[[offset]]
45// MSVC: }
46
47
48BB* c() { return x; }
49// CHECK: @_Z1cv() [[NUW]]
50// CHECK: [[VBASEOFFSETPTRC:%[a-zA-Z0-9\.]+]] = getelementptr i8, i8* {{.*}}, i64 -24
51// CHECK: [[CASTVBASEOFFSETPTRC:%[a-zA-Z0-9\.]+]] = bitcast i8* [[VBASEOFFSETPTRC]] to i32*
52// CHECK: [[VBASEOFFSETC:%[a-zA-Z0-9\.]+]] = load i32, i32* [[CASTVBASEOFFSETPTRC]]
53// CHECK: add i32 [[VBASEOFFSETC]], 8
54// CHECK: }
55
56// Same as 'a' except we use a different vbtable offset.
57// MSVC: @"\01?c@@YAPAUBB@@XZ"() [[NUW:#[0-9]+]] {
58// MSVC:   %[[vbptr_off:.*]] = getelementptr inbounds i8, i8* {{.*}}, i32 0
59// MSVC:   %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to i32**
60// MSVC:   %[[vbtable:.*]] = load i32*, i32** %[[vbptr]]
61// MSVC:   %[[entry:.*]] = getelementptr inbounds i32, i32* {{.*}}, i32 4
62// MSVC:   %[[offset:.*]] = load i32, i32* %[[entry]]
63// MSVC:   add nsw i32 0, %[[offset]]
64// MSVC: }
65
66// Put the vbptr at a non-zero offset inside a non-virtual base.
67struct E { int e; };
68struct F : E, D { int f; };
69
70F* y;
71
72BB* d() { return y; }
73
74// Same as 'c' except the vbptr offset is 4, changing the initial GEP and the
75// final add.
76// MSVC: @"\01?d@@YAPAUBB@@XZ"() [[NUW:#[0-9]+]] {
77// MSVC:   %[[vbptr_off:.*]] = getelementptr inbounds i8, i8* {{.*}}, i32 4
78// MSVC:   %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to i32**
79// MSVC:   %[[vbtable:.*]] = load i32*, i32** %[[vbptr]]
80// MSVC:   %[[entry:.*]] = getelementptr inbounds i32, i32* {{.*}}, i32 4
81// MSVC:   %[[offset:.*]] = load i32, i32* %[[entry]]
82// MSVC:   add nsw i32 4, %[[offset]]
83// MSVC: }
84
85// CHECK: attributes [[NUW]] = { nounwind{{.*}} }
86