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4c3c83afa7
Summary:
[MSan] handle llvm.launder.invariant.group
Msan used to give false-positives in
class Foo {
public:
virtual ~Foo() {};
};
// Return true iff *x is set.
bool f1(void **x, bool flag);
Foo* f() {
void *p;
bool found;
found = f1(&p,flag);
if (found) {
// p is always set here.
return static_cast<Foo*>(p); // False positive here.
}
return nullptr;
}
Patch by Ilya Tokar.
Reviewers: #sanitizers, eugenis
Reviewed By: #sanitizers, eugenis
Subscribers: eugenis, Prazek, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D68236
llvm-svn: 373515
22 lines
690 B
LLVM
22 lines
690 B
LLVM
; Make sure MSan handles llvm.launder.invariant.group correctly.
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; RUN: opt < %s -msan -msan-kernel=1 -O1 -S | FileCheck -check-prefixes=CHECK %s
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; RUN: opt < %s -msan -O1 -S | FileCheck -check-prefixes=CHECK %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@flag = dso_local local_unnamed_addr global i8 0, align 1
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define dso_local i8* @f(i8* %x) local_unnamed_addr #0 {
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entry:
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%0 = call i8* @llvm.strip.invariant.group.p0i8(i8* %x)
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ret i8* %0
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}
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; CHECK-NOT: call void @__msan_warning_noreturn
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declare i8* @llvm.strip.invariant.group.p0i8(i8*)
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attributes #0 = { sanitize_memory uwtable }
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