Reviewers: eugenis, pcc, kcc
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D49252
llvm-svn: 337170
void ShadowBuilder::AddUnchecked(uptr begin, uptr end) {
uint16_t *shadow_begin = MemToShadow(begin, shadow_);
uint16_t *shadow_end = MemToShadow(end - 1, shadow_) + 1;
- memset(shadow_begin, kUncheckedShadow,
+ // memset takes a byte, so our unchecked shadow value requires both bytes to
+ // be the same. Make sure we're ok during compilation.
+ static_assert(kUncheckedShadow & 0xff == ((kUncheckedShadow >> 8) & 0xff));
+ memset(shadow_begin, kUncheckedShadow & 0xff,
(shadow_end - shadow_begin) * sizeof(*shadow_begin));
}