1; RUN: opt < %s -passes=tsan -S | FileCheck %s 2; Check that tsan does not instrument reads from constant globals. 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" 5 6@const_global = external constant i32 7define i32 @read_from_const_global() nounwind uwtable sanitize_thread readnone { 8entry: 9 %0 = load i32, ptr @const_global, align 4 10 ret i32 %0 11} 12; CHECK: define i32 @read_from_const_global 13; CHECK-NOT: __tsan 14; CHECK: ret i32 15 16@non_const_global = global i32 0, align 4 17define i32 @read_from_non_const_global() nounwind uwtable sanitize_thread readonly { 18entry: 19 %0 = load i32, ptr @non_const_global, align 4 20 ret i32 %0 21} 22 23; CHECK: define i32 @read_from_non_const_global 24; CHECK: __tsan_read 25; CHECK: ret i32 26 27@const_global_array = external constant [10 x i32] 28define i32 @read_from_const_global_array(i32 %idx) nounwind uwtable sanitize_thread readnone { 29entry: 30 %idxprom = sext i32 %idx to i64 31 %arrayidx = getelementptr inbounds [10 x i32], ptr @const_global_array, i64 0, i64 %idxprom 32 %0 = load i32, ptr %arrayidx, align 4 33 ret i32 %0 34} 35 36; CHECK: define i32 @read_from_const_global_array 37; CHECK-NOT: __tsan 38; CHECK: ret i32 39 40%struct.Foo = type { ptr } 41define void @call_virtual_func(ptr %f) uwtable sanitize_thread { 42entry: 43 %vtable = load ptr, ptr %f, align 8, !tbaa !2 44 %0 = load ptr, ptr %vtable, align 8 45 call void %0(ptr %f) 46 ret void 47} 48 49; CHECK: define void @call_virtual_func 50; CHECK: __tsan_vptr_read 51; CHECK: = load 52; CHECK-NOT: __tsan_read 53; CHECK: = load 54; CHECK: ret void 55 56!0 = !{!"Simple C/C++ TBAA"} 57!1 = !{!"vtable pointer", !0} 58!2 = !{!1, !1, i64 0} 59