1; RUN: opt < %s -msan -msan-check-access-address=0 -msan-check-constant-shadow=1 -msan-track-origins=1 -S | FileCheck %s
2
3target 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"
4target triple = "x86_64-unknown-linux-gnu"
5
6; Test that returning a literal undef from main() triggers an MSan warning.
7
8; main() is special: it inserts check for the return value
9define i32 @main() nounwind uwtable sanitize_memory {
10entry:
11  ret i32 undef
12}
13
14; CHECK-LABEL: @main
15; CHECK: call void @__msan_warning_noreturn
16; CHECK: ret i32 undef
17
18
19; This function stores known initialized value.
20; Expect 2 stores: one for the shadow (0), one for the value (42), but no origin.
21define void @StoreConstant(i32* nocapture %p) nounwind uwtable sanitize_memory {
22entry:
23  store i32 42, i32* %p, align 4
24  ret void
25}
26
27; CHECK-LABEL: @StoreConstant
28; CHECK-NOT: store i32
29; CHECK: store i32 0,
30; CHECK-NOT: store i32
31; CHECK: store i32 42,
32; CHECK-NOT: store i32
33; CHECK: ret void
34
35
36; This function stores known uninitialized value.
37; Expect 3 stores: shadow, value and origin.
38; Expect no icmp(s): everything here is unconditional.
39define void @StoreUndef(i32* nocapture %p) nounwind uwtable sanitize_memory {
40entry:
41  store i32 undef, i32* %p, align 4
42  ret void
43}
44
45; CHECK-LABEL: @StoreUndef
46; CHECK-NOT: icmp
47; CHECK: store i32
48; CHECK-NOT: icmp
49; CHECK: store i32
50; CHECK-NOT: icmp
51; CHECK: store i32
52; CHECK-NOT: icmp
53; CHECK: ret void
54