; RUN: opt < %s -msan -msan-check-access-address=0 -S | FileCheck %s
-; RUN: opt < %s -msan -msan-check-access-address=0 -msan-track-origins=1 -S | FileCheck -check-prefix=CHECK-ORIGINS %s
-; RUN: opt < %s -msan -msan-check-access-address=1 -S | FileCheck %s -check-prefix=CHECK-AA
+; RUN: opt < %s -msan -msan-check-access-address=0 -msan-track-origins=1 -S | FileCheck -check-prefix=CHECK -check-prefix=CHECK-ORIGINS %s
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"
target triple = "x86_64-unknown-linux-gnu"
-; Check the presence of __msan_init
-; CHECK: @llvm.global_ctors {{.*}} @__msan_init
+; CHECK: @llvm.global_ctors {{.*}} @msan.module_ctor
; Check the presence and the linkage type of __msan_track_origins and
; other interface symbols.
; CHECK: @Store
; CHECK: load {{.*}} @__msan_param_tls
+; CHECK-ORIGINS: load {{.*}} @__msan_param_origin_tls
; CHECK: store
-; CHECK: store
-; CHECK: ret void
-; CHECK-ORIGINS: @Store
-; CHECK-ORIGINS: load {{.*}} @__msan_param_tls
-; CHECK-ORIGINS: store
; CHECK-ORIGINS: icmp
; CHECK-ORIGINS: br i1
; CHECK-ORIGINS: <label>
; CHECK-ORIGINS: store
; CHECK-ORIGINS: br label
; CHECK-ORIGINS: <label>
-; CHECK-ORIGINS: store
-; CHECK-ORIGINS: ret void
+; CHECK: store
+; CHECK: ret void
; Check instrumentation of aligned stores
; CHECK: @AlignedStore
; CHECK: load {{.*}} @__msan_param_tls
+; CHECK-ORIGINS: load {{.*}} @__msan_param_origin_tls
; CHECK: store {{.*}} align 32
-; CHECK: store {{.*}} align 32
-; CHECK: ret void
-; CHECK-ORIGINS: @AlignedStore
-; CHECK-ORIGINS: load {{.*}} @__msan_param_tls
-; CHECK-ORIGINS: store {{.*}} align 32
; CHECK-ORIGINS: icmp
; CHECK-ORIGINS: br i1
; CHECK-ORIGINS: <label>
; CHECK-ORIGINS: store {{.*}} align 32
; CHECK-ORIGINS: br label
; CHECK-ORIGINS: <label>
-; CHECK-ORIGINS: store {{.*}} align 32
-; CHECK-ORIGINS: ret void
+; CHECK: store {{.*}} align 32
+; CHECK: ret void
; load followed by cmp: check that we load the shadow and call __msan_warning.
define void @LoadAndCmp(i32* nocapture %a) nounwind uwtable sanitize_memory {
entry:
- %0 = load i32* %a, align 4
+ %0 = load i32, i32* %a, align 4
%tobool = icmp eq i32 %0, 0
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
- tail call void (...)* @foo() nounwind
+ tail call void (...) @foo() nounwind
br label %if.end
if.end: ; preds = %entry, %if.then
br i1 %tobool, label %if.else, label %if.then
if.then: ; preds = %entry
- %0 = load i32* %b, align 4
+ %0 = load i32, i32* %b, align 4
br label %if.end
if.else: ; preds = %entry
- %1 = load i32* %c, align 4
+ %1 = load i32, i32* %c, align 4
br label %if.end
if.end: ; preds = %if.else, %if.then
; Compute shadow for "x << 10"
define void @ShlConst(i32* nocapture %x) nounwind uwtable sanitize_memory {
entry:
- %0 = load i32* %x, align 4
+ %0 = load i32, i32* %x, align 4
%1 = shl i32 %0, 10
store i32 %1, i32* %x, align 4
ret void
; Compute shadow for "10 << x": it should have 'sext i1'.
define void @ShlNonConst(i32* nocapture %x) nounwind uwtable sanitize_memory {
entry:
- %0 = load i32* %x, align 4
+ %0 = load i32, i32* %x, align 4
%1 = shl i32 10, %0
store i32 %1, i32* %x, align 4
ret void
; SExt
define void @SExt(i32* nocapture %a, i16* nocapture %b) nounwind uwtable sanitize_memory {
entry:
- %0 = load i16* %b, align 2
+ %0 = load i16, i16* %b, align 2
%1 = sext i16 %0 to i32
store i32 %1, i32* %a, align 4
ret void
; Check that we propagate shadow for "select"
-define i32 @Select(i32 %a, i32 %b, i32 %c) nounwind uwtable readnone sanitize_memory {
+define i32 @Select(i32 %a, i32 %b, i1 %c) nounwind uwtable readnone sanitize_memory {
entry:
- %tobool = icmp ne i32 %c, 0
- %cond = select i1 %tobool, i32 %a, i32 %b
+ %cond = select i1 %c, i32 %a, i32 %b
ret i32 %cond
}
; CHECK: @Select
-; CHECK: select
-; CHECK-NEXT: sext i1 {{.*}} to i32
-; CHECK-NEXT: or i32
-; CHECK-NEXT: select
+; CHECK: select i1
+; CHECK-DAG: or i32
+; CHECK-DAG: xor i32
+; CHECK: or i32
+; CHECK-DAG: select i1
+; CHECK-ORIGINS-DAG: select
+; CHECK-ORIGINS-DAG: select
+; CHECK-DAG: select i1
+; CHECK: store i32{{.*}}@__msan_retval_tls
+; CHECK-ORIGINS: store i32{{.*}}@__msan_retval_origin_tls
; CHECK: ret i32
; CHECK: @SelectVector
; CHECK: select <8 x i1>
-; CHECK-NEXT: sext <8 x i1> {{.*}} to <8 x i16>
-; CHECK-NEXT: or <8 x i16>
-; CHECK-NEXT: select <8 x i1>
+; CHECK-DAG: or <8 x i16>
+; CHECK-DAG: xor <8 x i16>
+; CHECK: or <8 x i16>
+; CHECK-DAG: select <8 x i1>
+; CHECK-ORIGINS-DAG: select
+; CHECK-ORIGINS-DAG: select
+; CHECK-DAG: select <8 x i1>
+; CHECK: store <8 x i16>{{.*}}@__msan_retval_tls
+; CHECK-ORIGINS: store i32{{.*}}@__msan_retval_origin_tls
; CHECK: ret <8 x i16>
-; CHECK-ORIGINS: @SelectVector
-; CHECK-ORIGINS: bitcast <8 x i1> {{.*}} to i8
-; CHECK-ORIGINS: icmp ne i8
-; CHECK-ORIGINS: select i1
-; CHECK-ORIGINS: ret <8 x i16>
-
; Check that we propagate origin for "select" with scalar condition and vector
; arguments. Select condition shadow is sign-extended to the vector type and
; CHECK: @SelectVector2
; CHECK: select i1
-; CHECK: sext i1 {{.*}} to i128
-; CHECK: bitcast i128 {{.*}} to <8 x i16>
+; CHECK-DAG: or <8 x i16>
+; CHECK-DAG: xor <8 x i16>
; CHECK: or <8 x i16>
-; CHECK: select i1
+; CHECK-DAG: select i1
+; CHECK-ORIGINS-DAG: select i1
+; CHECK-ORIGINS-DAG: select i1
+; CHECK-DAG: select i1
; CHECK: ret <8 x i16>
; CHECK: @SelectStruct
; CHECK: select i1 {{.*}}, { i64, i64 }
; CHECK-NEXT: select i1 {{.*}}, { i64, i64 } { i64 -1, i64 -1 }, { i64, i64 }
+; CHECK-ORIGINS: select i1
+; CHECK-ORIGINS: select i1
; CHECK-NEXT: select i1 {{.*}}, { i64, i64 }
; CHECK: ret { i64, i64 }
+define { i64*, double } @SelectStruct2(i1 zeroext %x, { i64*, double } %a, { i64*, double } %b) readnone sanitize_memory {
+entry:
+ %c = select i1 %x, { i64*, double } %a, { i64*, double } %b
+ ret { i64*, double } %c
+}
+
+; CHECK: @SelectStruct2
+; CHECK: select i1 {{.*}}, { i64, i64 }
+; CHECK-NEXT: select i1 {{.*}}, { i64, i64 } { i64 -1, i64 -1 }, { i64, i64 }
+; CHECK-ORIGINS: select i1
+; CHECK-ORIGINS: select i1
+; CHECK-NEXT: select i1 {{.*}}, { i64*, double }
+; CHECK: ret { i64*, double }
+
+
define i8* @IntToPtr(i64 %x) nounwind uwtable readnone sanitize_memory {
entry:
%0 = inttoptr i64 %x to i8*
}
; CHECK: @IntToPtr
-; CHECK: load i64*{{.*}}__msan_param_tls
+; CHECK: load i64, i64*{{.*}}__msan_param_tls
+; CHECK-ORIGINS-NEXT: load i32, i32*{{.*}}__msan_param_origin_tls
; CHECK-NEXT: inttoptr
; CHECK-NEXT: store i64{{.*}}__msan_retval_tls
-; CHECK: ret i8
+; CHECK: ret i8*
define i8* @IntToPtr_ZExt(i16 %x) nounwind uwtable readnone sanitize_memory {
}
; CHECK: @IntToPtr_ZExt
+; CHECK: load i16, i16*{{.*}}__msan_param_tls
; CHECK: zext
; CHECK-NEXT: inttoptr
-; CHECK: ret i8
+; CHECK-NEXT: store i64{{.*}}__msan_retval_tls
+; CHECK: ret i8*
; Check that we insert exactly one check on udiv
define i32 @ShadowLoadAlignmentLarge() nounwind uwtable sanitize_memory {
%y = alloca i32, align 64
- %1 = load volatile i32* %y, align 64
+ %1 = load volatile i32, i32* %y, align 64
ret i32 %1
}
; CHECK: @ShadowLoadAlignmentLarge
-; CHECK: load volatile i32* {{.*}} align 64
-; CHECK: load i32* {{.*}} align 64
+; CHECK: load volatile i32, i32* {{.*}} align 64
+; CHECK: load i32, i32* {{.*}} align 64
; CHECK: ret i32
define i32 @ShadowLoadAlignmentSmall() nounwind uwtable sanitize_memory {
%y = alloca i32, align 2
- %1 = load volatile i32* %y, align 2
+ %1 = load volatile i32, i32* %y, align 2
ret i32 %1
}
; CHECK: @ShadowLoadAlignmentSmall
-; CHECK: load volatile i32* {{.*}} align 2
-; CHECK: load i32* {{.*}} align 2
+; CHECK: load volatile i32, i32* {{.*}} align 2
+; CHECK: load i32, i32* {{.*}} align 2
+; CHECK-ORIGINS: load i32, i32* {{.*}} align 4
; CHECK: ret i32
-; CHECK-ORIGINS: @ShadowLoadAlignmentSmall
-; CHECK-ORIGINS: load volatile i32* {{.*}} align 2
-; CHECK-ORIGINS: load i32* {{.*}} align 2
-; CHECK-ORIGINS: load i32* {{.*}} align 4
-; CHECK-ORIGINS: ret i32
-
; Test vector manipulation instructions.
; Check that the same bit manipulation is applied to the shadow values.
declare <16 x i8> @llvm.x86.sse3.ldu.dq(i8* %p) nounwind
; CHECK: @LoadIntrinsic
-; CHECK: load <16 x i8>* {{.*}} align 1
+; CHECK: load <16 x i8>, <16 x i8>* {{.*}} align 1
+; CHECK-ORIGINS: [[ORIGIN:%[01-9a-z]+]] = load i32, i32* {{.*}}
; CHECK-NOT: br
; CHECK-NOT: = or
; CHECK: call <16 x i8> @llvm.x86.sse3.ldu.dq
; CHECK: store <16 x i8> {{.*}} @__msan_retval_tls
-; CHECK: ret <16 x i8>
-
-; CHECK-ORIGINS: @LoadIntrinsic
-; CHECK-ORIGINS: [[ORIGIN:%[01-9a-z]+]] = load i32* {{.*}}
-; CHECK-ORIGINS: call <16 x i8> @llvm.x86.sse3.ldu.dq
; CHECK-ORIGINS: store i32 {{.*}}[[ORIGIN]], i32* @__msan_retval_origin_tls
-; CHECK-ORIGINS: ret <16 x i8>
+; CHECK: ret <16 x i8>
; Simple NoMem intrinsic
declare <8 x i16> @llvm.x86.sse2.padds.w(<8 x i16> %a, <8 x i16> %b) nounwind
; CHECK: @Paddsw128
-; CHECK-NEXT: load <8 x i16>* {{.*}} @__msan_param_tls
-; CHECK-NEXT: load <8 x i16>* {{.*}} @__msan_param_tls
+; CHECK-NEXT: load <8 x i16>, <8 x i16>* {{.*}} @__msan_param_tls
+; CHECK-ORIGINS: load i32, i32* {{.*}} @__msan_param_origin_tls
+; CHECK-NEXT: load <8 x i16>, <8 x i16>* {{.*}} @__msan_param_tls
+; CHECK-ORIGINS: load i32, i32* {{.*}} @__msan_param_origin_tls
; CHECK-NEXT: = or <8 x i16>
-; CHECK-NEXT: call <8 x i16> @llvm.x86.sse2.padds.w
-; CHECK-NEXT: store <8 x i16> {{.*}} @__msan_retval_tls
-; CHECK-NEXT: ret <8 x i16>
-
-; CHECK-ORIGINS: @Paddsw128
-; CHECK-ORIGINS: load i32* {{.*}} @__msan_param_origin_tls
-; CHECK-ORIGINS: load i32* {{.*}} @__msan_param_origin_tls
; CHECK-ORIGINS: = bitcast <8 x i16> {{.*}} to i128
; CHECK-ORIGINS-NEXT: = icmp ne i128 {{.*}}, 0
; CHECK-ORIGINS-NEXT: = select i1 {{.*}}, i32 {{.*}}, i32
-; CHECK-ORIGINS: call <8 x i16> @llvm.x86.sse2.padds.w
+; CHECK-NEXT: call <8 x i16> @llvm.x86.sse2.padds.w
+; CHECK-NEXT: store <8 x i16> {{.*}} @__msan_retval_tls
; CHECK-ORIGINS: store i32 {{.*}} @__msan_retval_origin_tls
-; CHECK-ORIGINS: ret <8 x i16>
+; CHECK-NEXT: ret <8 x i16>
; Test handling of vectors of pointers.
; Check that shadow of such vector is a vector of integers.
define <8 x i8*> @VectorOfPointers(<8 x i8*>* %p) nounwind uwtable sanitize_memory {
- %x = load <8 x i8*>* %p
+ %x = load <8 x i8*>, <8 x i8*>* %p
ret <8 x i8*> %x
}
; CHECK: @VectorOfPointers
-; CHECK: load <8 x i8*>*
-; CHECK: load <8 x i64>*
+; CHECK: load <8 x i8*>, <8 x i8*>*
+; CHECK: load <8 x i64>, <8 x i64>*
; CHECK: store <8 x i64> {{.*}} @__msan_retval_tls
; CHECK: ret <8 x i8*>
declare void @llvm.va_start(i8*) nounwind
; Function Attrs: nounwind uwtable
-define void @VAStart(i32 %x, ...) {
+define void @VAStart(i32 %x, ...) sanitize_memory {
entry:
%x.addr = alloca i32, align 4
%va = alloca [1 x %struct.__va_list_tag], align 16
store i32 %x, i32* %x.addr, align 4
- %arraydecay = getelementptr inbounds [1 x %struct.__va_list_tag]* %va, i32 0, i32 0
+ %arraydecay = getelementptr inbounds [1 x %struct.__va_list_tag], [1 x %struct.__va_list_tag]* %va, i32 0, i32 0
%arraydecay1 = bitcast %struct.__va_list_tag* %arraydecay to i8*
call void @llvm.va_start(i8* %arraydecay1)
ret void
; CHECK: ret void
-; Test that checks are omitted but shadow propagation is kept if
+; Test that checks are omitted and returned value is always initialized if
; sanitize_memory attribute is missing.
define i32 @NoSanitizeMemory(i32 %x) uwtable {
; CHECK: @NoSanitizeMemory
; CHECK-NOT: @__msan_warning
-; CHECK: load i32* {{.*}} @__msan_param_tls
-; CHECK-NOT: @__msan_warning
-; CHECK: store {{.*}} @__msan_retval_tls
+; CHECK: store i32 0, {{.*}} @__msan_retval_tls
; CHECK-NOT: @__msan_warning
; CHECK: ret i32
; CHECK: ret i32
+; Test PHINode instrumentation in blacklisted functions
+
+define i32 @NoSanitizeMemoryPHI(i32 %x) {
+entry:
+ %tobool = icmp ne i32 %x, 0
+ br i1 %tobool, label %cond.true, label %cond.false
+
+cond.true: ; preds = %entry
+ br label %cond.end
+
+cond.false: ; preds = %entry
+ br label %cond.end
+
+cond.end: ; preds = %cond.false, %cond.true
+ %cond = phi i32 [ undef, %cond.true ], [ undef, %cond.false ]
+ ret i32 %cond
+}
+
+; CHECK: [[A:%.*]] = phi i32 [ undef, %cond.true ], [ undef, %cond.false ]
+; CHECK: store i32 0, i32* bitcast {{.*}} @__msan_retval_tls
+; CHECK: ret i32 [[A]]
+
+
+; Test that there are no __msan_param_origin_tls stores when
+; argument shadow is a compile-time zero constant (which is always the case
+; in functions missing sanitize_memory attribute).
+
+define i32 @NoSanitizeMemoryParamTLS(i32* nocapture readonly %x) {
+entry:
+ %0 = load i32, i32* %x, align 4
+ %call = tail call i32 @NoSanitizeMemoryParamTLSHelper(i32 %0)
+ ret i32 %call
+}
+
+declare i32 @NoSanitizeMemoryParamTLSHelper(i32 %x)
+
+; CHECK-LABEL: define i32 @NoSanitizeMemoryParamTLS(
+; CHECK-NOT: __msan_param_origin_tls
+; CHECK: ret i32
+
+
; Test argument shadow alignment
define <2 x i64> @ArgumentShadowAlignment(i64 %a, <2 x i64> %b) sanitize_memory {
}
; CHECK: @ArgumentShadowAlignment
-; CHECK: load <2 x i64>* {{.*}} @__msan_param_tls {{.*}}, align 8
+; CHECK: load <2 x i64>, <2 x i64>* {{.*}} @__msan_param_tls {{.*}}, align 8
; CHECK: store <2 x i64> {{.*}} @__msan_retval_tls {{.*}}, align 8
; CHECK: ret <2 x i64>
-; Test byval argument shadow alignment
+; Test origin propagation for insertvalue
-define <2 x i64> @ByValArgumentShadowLargeAlignment(<2 x i64>* byval %p) sanitize_memory {
+define { i64, i32 } @make_pair_64_32(i64 %x, i32 %y) sanitize_memory {
entry:
- %x = load <2 x i64>* %p
- ret <2 x i64> %x
+ %a = insertvalue { i64, i32 } undef, i64 %x, 0
+ %b = insertvalue { i64, i32 } %a, i32 %y, 1
+ ret { i64, i32 } %b
}
-; CHECK-AA: @ByValArgumentShadowLargeAlignment
-; CHECK-AA: call void @llvm.memcpy.p0i8.p0i8.i64(i8* {{.*}}, i8* {{.*}}, i64 16, i32 8, i1 false)
-; CHECK-AA: ret <2 x i64>
+; CHECK-ORIGINS: @make_pair_64_32
+; First element shadow
+; CHECK-ORIGINS: insertvalue { i64, i32 } { i64 -1, i32 -1 }, i64 {{.*}}, 0
+; First element origin
+; CHECK-ORIGINS: icmp ne i64
+; CHECK-ORIGINS: select i1
+; First element app value
+; CHECK-ORIGINS: insertvalue { i64, i32 } undef, i64 {{.*}}, 0
+; Second element shadow
+; CHECK-ORIGINS: insertvalue { i64, i32 } {{.*}}, i32 {{.*}}, 1
+; Second element origin
+; CHECK-ORIGINS: icmp ne i32
+; CHECK-ORIGINS: select i1
+; Second element app value
+; CHECK-ORIGINS: insertvalue { i64, i32 } {{.*}}, i32 {{.*}}, 1
+; CHECK-ORIGINS: ret { i64, i32 }
+
+
+; Test shadow propagation for aggregates passed through ellipsis.
+
+%struct.StructByVal = type { i32, i32, i32, i32 }
+declare void @VAArgStructFn(i32 %guard, ...)
-define i16 @ByValArgumentShadowSmallAlignment(i16* byval %p) sanitize_memory {
+define void @VAArgStruct(%struct.StructByVal* nocapture %s) sanitize_memory {
entry:
- %x = load i16* %p
- ret i16 %x
+ %agg.tmp2 = alloca %struct.StructByVal, align 8
+ %0 = bitcast %struct.StructByVal* %s to i8*
+ %agg.tmp.sroa.0.0..sroa_cast = bitcast %struct.StructByVal* %s to i64*
+ %agg.tmp.sroa.0.0.copyload = load i64, i64* %agg.tmp.sroa.0.0..sroa_cast, align 4
+ %agg.tmp.sroa.2.0..sroa_idx = getelementptr inbounds %struct.StructByVal, %struct.StructByVal* %s, i64 0, i32 2
+ %agg.tmp.sroa.2.0..sroa_cast = bitcast i32* %agg.tmp.sroa.2.0..sroa_idx to i64*
+ %agg.tmp.sroa.2.0.copyload = load i64, i64* %agg.tmp.sroa.2.0..sroa_cast, align 4
+ %1 = bitcast %struct.StructByVal* %agg.tmp2 to i8*
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %1, i8* %0, i64 16, i32 4, i1 false)
+ call void (i32, ...) @VAArgStructFn(i32 undef, i64 %agg.tmp.sroa.0.0.copyload, i64 %agg.tmp.sroa.2.0.copyload, i64 %agg.tmp.sroa.0.0.copyload, i64 %agg.tmp.sroa.2.0.copyload, %struct.StructByVal* byval align 8 %agg.tmp2)
+ ret void
}
-; CHECK-AA: @ByValArgumentShadowSmallAlignment
-; CHECK-AA: call void @llvm.memcpy.p0i8.p0i8.i64(i8* {{.*}}, i8* {{.*}}, i64 2, i32 2, i1 false)
-; CHECK-AA: ret i16
+; "undef" and the first 2 structs go to general purpose registers;
+; the third struct goes to the overflow area byval
+
+; CHECK: @VAArgStruct
+; undef
+; CHECK: store i32 -1, i32* {{.*}}@__msan_va_arg_tls {{.*}}, align 8
+; first struct through general purpose registers
+; CHECK: store i64 {{.*}}, i64* {{.*}}@__msan_va_arg_tls{{.*}}, i64 8){{.*}}, align 8
+; CHECK: store i64 {{.*}}, i64* {{.*}}@__msan_va_arg_tls{{.*}}, i64 16){{.*}}, align 8
+; second struct through general purpose registers
+; CHECK: store i64 {{.*}}, i64* {{.*}}@__msan_va_arg_tls{{.*}}, i64 24){{.*}}, align 8
+; CHECK: store i64 {{.*}}, i64* {{.*}}@__msan_va_arg_tls{{.*}}, i64 32){{.*}}, align 8
+; third struct through the overflow area byval
+; CHECK: ptrtoint %struct.StructByVal* {{.*}} to i64
+; CHECK: bitcast { i32, i32, i32, i32 }* {{.*}}@__msan_va_arg_tls {{.*}}, i64 176
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64
+; CHECK: store i64 16, i64* @__msan_va_arg_overflow_size_tls
+; CHECK: call void (i32, ...) @VAArgStructFn
+; CHECK: ret void
+
+declare i32 @InnerTailCall(i32 %a)
+
+define void @MismatchedReturnTypeTailCall(i32 %a) sanitize_memory {
+ %b = tail call i32 @InnerTailCall(i32 %a)
+ ret void
+}
+
+; We used to strip off the 'tail' modifier, but now that we unpoison return slot
+; shadow before the call, we don't need to anymore.
+
+; CHECK-LABEL: define void @MismatchedReturnTypeTailCall
+; CHECK: tail call i32 @InnerTailCall
+; CHECK: ret void
+; CHECK-LABEL: define internal void @msan.module_ctor
+; CHECK: call void @__msan_init()
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