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62 lines
1.8 KiB
LLVM
62 lines
1.8 KiB
LLVM
; RUN: opt < %s -tsan -S | FileCheck %s
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; Check that tsan does not instrument reads from constant globals.
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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"
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@const_global = external constant i32
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define i32 @read_from_const_global() nounwind uwtable readnone {
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entry:
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%0 = load i32* @const_global, align 4
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ret i32 %0
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}
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; CHECK: define i32 @read_from_const_global
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; CHECK-NOT: __tsan
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; CHECK: ret i32
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@non_const_global = global i32 0, align 4
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define i32 @read_from_non_const_global() nounwind uwtable readonly {
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entry:
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%0 = load i32* @non_const_global, align 4
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ret i32 %0
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}
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; CHECK: define i32 @read_from_non_const_global
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; CHECK: __tsan_read
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; CHECK: ret i32
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@const_global_array = external constant [10 x i32]
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define i32 @read_from_const_global_array(i32 %idx) nounwind uwtable readnone {
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entry:
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%idxprom = sext i32 %idx to i64
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%arrayidx = getelementptr inbounds [10 x i32]* @const_global_array, i64 0, i64 %idxprom
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%0 = load i32* %arrayidx, align 4
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ret i32 %0
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}
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; CHECK: define i32 @read_from_const_global_array
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; CHECK-NOT: __tsan
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; CHECK: ret i32
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%struct.Foo = type { i32 (...)** }
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define void @call_virtual_func(%struct.Foo* %f) uwtable {
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entry:
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%0 = bitcast %struct.Foo* %f to void (%struct.Foo*)***
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%vtable = load void (%struct.Foo*)*** %0, align 8, !tbaa !3
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%1 = load void (%struct.Foo*)** %vtable, align 8
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call void %1(%struct.Foo* %f)
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ret void
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}
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; CHECK: define void @call_virtual_func
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; CHECK: __tsan_vptr_read
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; CHECK: = load
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; CHECK-NOT: __tsan_read
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; CHECK: = load
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; CHECK: ret void
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!0 = metadata !{metadata !"int", metadata !1}
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!1 = metadata !{metadata !"omnipotent char", metadata !2}
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!2 = metadata !{metadata !"Simple C/C++ TBAA", null}
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!3 = metadata !{metadata !"vtable pointer", metadata !2}
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