Handle llvm.launder.invariant.group in msan.
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
464df87288