1*9880d681SAndroid Build Coastguard Worker; RUN: opt < %s -msan -msan-check-access-address=0 -msan-check-constant-shadow=1 -msan-track-origins=1 -S | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker 3*9880d681SAndroid Build Coastguard Workertarget 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*9880d681SAndroid Build Coastguard Workertarget triple = "x86_64-unknown-linux-gnu" 5*9880d681SAndroid Build Coastguard Worker 6*9880d681SAndroid Build Coastguard Worker; Test that returning a literal undef from main() triggers an MSan warning. 7*9880d681SAndroid Build Coastguard Worker 8*9880d681SAndroid Build Coastguard Worker; main() is special: it inserts check for the return value 9*9880d681SAndroid Build Coastguard Workerdefine i32 @main() nounwind uwtable sanitize_memory { 10*9880d681SAndroid Build Coastguard Workerentry: 11*9880d681SAndroid Build Coastguard Worker ret i32 undef 12*9880d681SAndroid Build Coastguard Worker} 13*9880d681SAndroid Build Coastguard Worker 14*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @main 15*9880d681SAndroid Build Coastguard Worker; CHECK: call void @__msan_warning_noreturn 16*9880d681SAndroid Build Coastguard Worker; CHECK: ret i32 undef 17*9880d681SAndroid Build Coastguard Worker 18*9880d681SAndroid Build Coastguard Worker 19*9880d681SAndroid Build Coastguard Worker; This function stores known initialized value. 20*9880d681SAndroid Build Coastguard Worker; Expect 2 stores: one for the shadow (0), one for the value (42), but no origin. 21*9880d681SAndroid Build Coastguard Workerdefine void @StoreConstant(i32* nocapture %p) nounwind uwtable sanitize_memory { 22*9880d681SAndroid Build Coastguard Workerentry: 23*9880d681SAndroid Build Coastguard Worker store i32 42, i32* %p, align 4 24*9880d681SAndroid Build Coastguard Worker ret void 25*9880d681SAndroid Build Coastguard Worker} 26*9880d681SAndroid Build Coastguard Worker 27*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @StoreConstant 28*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: store i32 29*9880d681SAndroid Build Coastguard Worker; CHECK: store i32 0, 30*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: store i32 31*9880d681SAndroid Build Coastguard Worker; CHECK: store i32 42, 32*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: store i32 33*9880d681SAndroid Build Coastguard Worker; CHECK: ret void 34*9880d681SAndroid Build Coastguard Worker 35*9880d681SAndroid Build Coastguard Worker 36*9880d681SAndroid Build Coastguard Worker; This function stores known uninitialized value. 37*9880d681SAndroid Build Coastguard Worker; Expect 3 stores: shadow, value and origin. 38*9880d681SAndroid Build Coastguard Worker; Expect no icmp(s): everything here is unconditional. 39*9880d681SAndroid Build Coastguard Workerdefine void @StoreUndef(i32* nocapture %p) nounwind uwtable sanitize_memory { 40*9880d681SAndroid Build Coastguard Workerentry: 41*9880d681SAndroid Build Coastguard Worker store i32 undef, i32* %p, align 4 42*9880d681SAndroid Build Coastguard Worker ret void 43*9880d681SAndroid Build Coastguard Worker} 44*9880d681SAndroid Build Coastguard Worker 45*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @StoreUndef 46*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: icmp 47*9880d681SAndroid Build Coastguard Worker; CHECK: store i32 48*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: icmp 49*9880d681SAndroid Build Coastguard Worker; CHECK: store i32 50*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: icmp 51*9880d681SAndroid Build Coastguard Worker; CHECK: store i32 52*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: icmp 53*9880d681SAndroid Build Coastguard Worker; CHECK: ret void 54