1; RUN: opt < %s -msan-check-access-address=0 -msan-eager-checks=1 -msan-track-origins=1 -S -passes=msan 2>&1 | FileCheck --check-prefixes=CHECK,CONST %s --implicit-check-not=icmp --implicit-check-not="store i" --implicit-check-not="call void @__msan" 2; RUN: opt < %s -msan-check-access-address=0 -msan-check-constant-shadow=0 -msan-eager-checks=1 -msan-track-origins=1 -S -passes=msan 2>&1 | FileCheck --check-prefixes=CHECK %s --implicit-check-not=icmp --implicit-check-not="store i" --implicit-check-not="call void @__msan" 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" 5target triple = "x86_64-unknown-linux-gnu" 6 7; Test that returning a literal undef from main() triggers an MSan warning. 8 9; main() is special: it inserts check for the return value 10define i32 @main() nounwind uwtable sanitize_memory { 11entry: 12 ret i32 undef 13} 14 15; CHECK-LABEL: @main 16; CHECK: store i32 0, ptr @__msan_retval_tls 17; CONST: call void @__msan_warning_with_origin_noreturn 18; CHECK: ret i32 undef 19 20 21; This function stores known initialized value. 22; Expect 2 stores: one for the shadow (0), one for the value (42), but no origin. 23define void @StoreConstant(ptr nocapture %p) nounwind uwtable sanitize_memory { 24entry: 25 store i32 42, ptr %p, align 4 26 ret void 27} 28 29; CHECK-LABEL: @StoreConstant 30; CHECK: store i32 0, 31; CHECK: store i32 42, 32; CHECK: ret void 33 34 35; This function stores known uninitialized value. 36; Expect 3 stores: shadow, value and origin. 37; Expect no icmp(s): everything here is unconditional. 38define void @StoreUndef(ptr nocapture %p) nounwind uwtable sanitize_memory { 39entry: 40 store i32 undef, ptr %p, align 4 41 ret void 42} 43 44; CHECK-LABEL: @StoreUndef 45; CHECK: store i32 -1, 46; CONST: store i32 0, 47; CHECK: store i32 undef, 48; CHECK: ret void 49 50 51; This function stores known initialized value, but msan can't prove this. 52define i32 @MaybeUninitialized(<2 x i64> noundef %acc) nounwind uwtable sanitize_memory { 53entry: 54 %shift = shufflevector <2 x i64> %acc, <2 x i64> poison, <2 x i32> <i32 1, i32 undef> 55 %0 = add <2 x i64> %shift, %acc 56 %1 = bitcast <2 x i64> %0 to <4 x i32> 57 %conv = extractelement <4 x i32> %1, i64 0 58 ret i32 %conv 59} 60 61; CHECK-LABEL: @MaybeUninitialized 62; CHECK: store i32 extractelement (<4 x i32> bitcast (<2 x i64> <i64 0, i64 undef> to <4 x i32>), i64 0), ptr @__msan_retval_tls, align 8 63; CHECK: store i32 0, ptr @__msan_retval_origin_tls 64 65; This function stores known initialized value, but msan can't prove this. 66define noundef i32 @MaybeUninitializedRetNoUndef(<2 x i64> noundef %acc) nounwind uwtable sanitize_memory { 67entry: 68 %shift = shufflevector <2 x i64> %acc, <2 x i64> poison, <2 x i32> <i32 1, i32 undef> 69 %0 = add <2 x i64> %shift, %acc 70 %1 = bitcast <2 x i64> %0 to <4 x i32> 71 %conv = extractelement <4 x i32> %1, i64 0 72 ret i32 %conv 73} 74 75; CHECK-LABEL: @MaybeUninitializedRetNoUndef 76; CONST: [[CMP:%.*]] = icmp ne i32 extractelement (<4 x i32> bitcast (<2 x i64> <i64 0, i64 undef> to <4 x i32>), i64 0), 0 77; CONST: br i1 [[CMP]] 78; CONST: call void @__msan_warning_with_origin_noreturn 79 80; CHECK: call void @__msan_init() 81