1 ; RUN: opt < %s -msan -msan-check-access-address=0 -msan-check-constant-shadow=1 -msan-track-origins=1 -S | FileCheck %s 2 3 target 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" 4 target 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 9 define i32 @main() nounwind uwtable sanitize_memory { 10 entry: 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. 21 define void @StoreConstant(i32* nocapture %p) nounwind uwtable sanitize_memory { 22 entry: 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. 39 define void @StoreUndef(i32* nocapture %p) nounwind uwtable sanitize_memory { 40 entry: 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
