[Sanitizers] Add metadata to memsets created in zeroInit for LLDB #85558
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LLDB memsets new allocas to zero. It does this in order to be able to display a friendly 'variable is uninitialized' message rather than garbage. Unfortunately this use of a variable before its lifetime.start disagrees with the memtag-stack tagging pass. This patch attaches a piece of metadata to these memsets, so that the memtag-stack tagging pass can recognize them and work around them appropriately. rdar://162206592
DanBlackwell
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adrian-prantl,
felipepiovezan,
ndrewh,
thetruestblue,
usama54321,
wrotki and
yln
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@swift-ci please test |
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LLDB memsets new allocas to zero. It does this in order to be able to display a friendly 'variable is uninitialized' message rather than garbage. Unfortunately this use of a variable before its lifetime.start disagrees with the memtag-stack tagging pass.
This patch attaches a piece of metadata to these memsets, so that the memtag-stack tagging pass can recognize them and work around them appropriately.
Paired with: swiftlang/llvm-project#11846.
rdar://162206592