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1; RUN: opt < %s -tsan -S | FileCheck %s
2; Check that tsan does not instrument reads from constant globals.
3
4target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
5
6@const_global = external constant i32
7define i32 @read_from_const_global() nounwind uwtable sanitize_thread readnone {
8entry:
9  %0 = load i32, i32* @const_global, align 4
10  ret i32 %0
11}
12; CHECK: define i32 @read_from_const_global
13; CHECK-NOT: __tsan
14; CHECK: ret i32
15
16@non_const_global = global i32 0, align 4
17define i32 @read_from_non_const_global() nounwind uwtable sanitize_thread readonly {
18entry:
19  %0 = load i32, i32* @non_const_global, align 4
20  ret i32 %0
21}
22
23; CHECK:  define i32 @read_from_non_const_global
24; CHECK: __tsan_read
25; CHECK: ret i32
26
27@const_global_array = external constant [10 x i32]
28define i32 @read_from_const_global_array(i32 %idx) nounwind uwtable sanitize_thread readnone {
29entry:
30  %idxprom = sext i32 %idx to i64
31  %arrayidx = getelementptr inbounds [10 x i32], [10 x i32]* @const_global_array, i64 0, i64 %idxprom
32  %0 = load i32, i32* %arrayidx, align 4
33  ret i32 %0
34}
35
36; CHECK: define i32 @read_from_const_global_array
37; CHECK-NOT: __tsan
38; CHECK: ret i32
39
40%struct.Foo = type { i32 (...)** }
41define void @call_virtual_func(%struct.Foo* %f) uwtable sanitize_thread {
42entry:
43  %0 = bitcast %struct.Foo* %f to void (%struct.Foo*)***
44  %vtable = load void (%struct.Foo*)**, void (%struct.Foo*)*** %0, align 8, !tbaa !2
45  %1 = load void (%struct.Foo*)*, void (%struct.Foo*)** %vtable, align 8
46  call void %1(%struct.Foo* %f)
47  ret void
48}
49
50; CHECK: define void @call_virtual_func
51; CHECK: __tsan_vptr_read
52; CHECK: = load
53; CHECK-NOT: __tsan_read
54; CHECK: = load
55; CHECK: ret void
56
57!0 = !{!"Simple C/C++ TBAA", null}
58!1 = !{!"vtable pointer", !0}
59!2 = !{!1, !1, i64 0}
60