1 ; RUN: opt < %s -tsan -S | FileCheck %s 2 ; Check that tsan does not instrument reads from constant globals. 3 4 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" 5 6 @const_global = external constant i32 7 define i32 @read_from_const_global() nounwind uwtable readnone { 8 entry: 9 %0 = load i32* @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 17 define i32 @read_from_non_const_global() nounwind uwtable readonly { 18 entry: 19 %0 = load i32* @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] 28 define i32 @read_from_const_global_array(i32 %idx) nounwind uwtable readnone { 29 entry: 30 %idxprom = sext i32 %idx to i64 31 %arrayidx = getelementptr inbounds [10 x i32]* @const_global_array, i64 0, i64 %idxprom 32 %0 = load i32* %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 { i32 (...)** } 41 define void @call_virtual_func(%struct.Foo* %f) uwtable { 42 entry: 43 %0 = bitcast %struct.Foo* %f to void (%struct.Foo*)*** 44 %vtable = load void (%struct.Foo*)*** %0, align 8, !tbaa !3 45 %1 = load void (%struct.Foo*)** %vtable, align 8 46 call void %1(%struct.Foo* %f) 47 ret void 48 } 49 50 ; CHECK: define void @call_virtual_func 51 ; CHECK: __tsan_vptr_read 52 ; CHECK: = load 53 ; CHECK-NOT: __tsan_read 54 ; CHECK: = load 55 ; CHECK: ret void 56 57 !0 = metadata !{metadata !"int", metadata !1} 58 !1 = metadata !{metadata !"omnipotent char", metadata !2} 59 !2 = metadata !{metadata !"Simple C/C++ TBAA", null} 60 !3 = metadata !{metadata !"vtable pointer", metadata !2} 61 62
