[PATCH] D143680: [WIP][-Wunsafe-buffer-usage] Improve fix-its for local variable declarations with null pointer initializers

[Ziqing Luo via Phabricator via cfe-commits]

ziqingluo-90 created this revision.
ziqingluo-90 added reviewers: jkorous, NoQ, t-rasmud, malavikasamak.
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For a local pointer declaration of the form `T * p = 0` or `T * p.= std::nullptr`,  we generate fix-its that convert the declaration to `std::span<T> p {nullptr, <# placeholder #>}`, in cases where `p` is used in some unsafe operations.

This patch improves the fix-its to result in a simpler form `std::span<T> p`.   It gets rid of the placeholder and keeps the result concise.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143680

Files:
  clang/lib/Analysis/UnsafeBufferUsage.cpp
  clang/test/SemaCXX/warn-unsafe-buffer-usage-fixits-local-var-span.cpp

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