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bb38b0a59d
Summary: Normally, the Origin is passed over TLS, which seems like it introduces unnecessary overhead. It's in the (extremely) cold path though, so the only overhead is in code size. But with eager-checks, calls to __msan_warning functions are extremely common, so this becomes a useful optimization. This can save ~5% code size. Reviewers: eugenis, vitalybuka Reviewed By: eugenis, vitalybuka Subscribers: hiraditya, #sanitizers, llvm-commits Tags: #sanitizers, #llvm Differential Revision: https://reviews.llvm.org/D81700
56 lines
1.6 KiB
LLVM
56 lines
1.6 KiB
LLVM
; RUN: opt < %s -msan-check-access-address=0 -msan-check-constant-shadow=1 \
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; RUN: -msan-track-origins=1 -S -passes=msan 2>&1 | FileCheck %s
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; RUN: opt < %s -msan -msan-check-access-address=0 -msan-check-constant-shadow=1 -msan-track-origins=1 -S | FileCheck %s
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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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target triple = "x86_64-unknown-linux-gnu"
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; Test that returning a literal undef from main() triggers an MSan warning.
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; main() is special: it inserts check for the return value
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define i32 @main() nounwind uwtable sanitize_memory {
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entry:
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ret i32 undef
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}
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; CHECK-LABEL: @main
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; CHECK: call void @__msan_warning_with_origin_noreturn
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; CHECK: ret i32 undef
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; This function stores known initialized value.
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; Expect 2 stores: one for the shadow (0), one for the value (42), but no origin.
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define void @StoreConstant(i32* nocapture %p) nounwind uwtable sanitize_memory {
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entry:
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store i32 42, i32* %p, align 4
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ret void
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}
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; CHECK-LABEL: @StoreConstant
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; CHECK-NOT: store i32
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; CHECK: store i32 0,
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; CHECK-NOT: store i32
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; CHECK: store i32 42,
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; CHECK-NOT: store i32
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; CHECK: ret void
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; This function stores known uninitialized value.
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; Expect 3 stores: shadow, value and origin.
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; Expect no icmp(s): everything here is unconditional.
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define void @StoreUndef(i32* nocapture %p) nounwind uwtable sanitize_memory {
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entry:
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store i32 undef, i32* %p, align 4
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ret void
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}
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; CHECK-LABEL: @StoreUndef
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; CHECK-NOT: icmp
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; CHECK: store i32
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; CHECK-NOT: icmp
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; CHECK: store i32
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; CHECK-NOT: icmp
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; CHECK: store i32
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; CHECK-NOT: icmp
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; CHECK: ret void
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