| ; RUN: opt < %s -tsan -S | FileCheck %s |
| ; Check that tsan does not instrument reads from constant globals. |
| |
| 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" |
| |
| @const_global = external constant i32 |
| define i32 @read_from_const_global() nounwind uwtable sanitize_thread readnone { |
| entry: |
| %0 = load i32, i32* @const_global, align 4 |
| ret i32 %0 |
| } |
| ; CHECK: define i32 @read_from_const_global |
| ; CHECK-NOT: __tsan |
| ; CHECK: ret i32 |
| |
| @non_const_global = global i32 0, align 4 |
| define i32 @read_from_non_const_global() nounwind uwtable sanitize_thread readonly { |
| entry: |
| %0 = load i32, i32* @non_const_global, align 4 |
| ret i32 %0 |
| } |
| |
| ; CHECK: define i32 @read_from_non_const_global |
| ; CHECK: __tsan_read |
| ; CHECK: ret i32 |
| |
| @const_global_array = external constant [10 x i32] |
| define i32 @read_from_const_global_array(i32 %idx) nounwind uwtable sanitize_thread readnone { |
| entry: |
| %idxprom = sext i32 %idx to i64 |
| %arrayidx = getelementptr inbounds [10 x i32], [10 x i32]* @const_global_array, i64 0, i64 %idxprom |
| %0 = load i32, i32* %arrayidx, align 4 |
| ret i32 %0 |
| } |
| |
| ; CHECK: define i32 @read_from_const_global_array |
| ; CHECK-NOT: __tsan |
| ; CHECK: ret i32 |
| |
| %struct.Foo = type { i32 (...)** } |
| define void @call_virtual_func(%struct.Foo* %f) uwtable sanitize_thread { |
| entry: |
| %0 = bitcast %struct.Foo* %f to void (%struct.Foo*)*** |
| %vtable = load void (%struct.Foo*)**, void (%struct.Foo*)*** %0, align 8, !tbaa !2 |
| %1 = load void (%struct.Foo*)*, void (%struct.Foo*)** %vtable, align 8 |
| call void %1(%struct.Foo* %f) |
| ret void |
| } |
| |
| ; CHECK: define void @call_virtual_func |
| ; CHECK: __tsan_vptr_read |
| ; CHECK: = load |
| ; CHECK-NOT: __tsan_read |
| ; CHECK: = load |
| ; CHECK: ret void |
| |
| !0 = !{!"Simple C/C++ TBAA"} |
| !1 = !{!"vtable pointer", !0} |
| !2 = !{!1, !1, i64 0} |