[PATCH] D137205: [clang-tidy] Add performance-unnecessary-copy-on-last-use check
Fabian Keßler via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Sun Jan 15 04:46:15 PST 2023
Febbe added a comment.
In D137205#4047828 <https://reviews.llvm.org/D137205#4047828>, @Skylion007 wrote:
> I am trying this in the wild and getting some false positives where it tries to call std::move inside loop conditions and in the boolean condition for an if statement. Stuff like:
>
> if (SmartPtr new_ptr = steal_ptr(std::move(old_ptr))) {
> ...
> }
> else {
> return old_ptr; // Now it's moved from and invalid
> }
>
> Also this can be happen for similar boolean conditionals in while, for, do while loops.
>
> Interestingly, the logic in bugprone-use-after-move flags this error so maybe we can reuse some of that logic to detect bad std::move.
Does this only happen on "init-statements" of while/if/switch?
And thanks for the catch, I'll take a look into it as soon I have more time.
Btw. I've oriented myself at the "bugprone-use-after-move" check, but simply inverting it does not work here.
Repository:
rG LLVM Github Monorepo
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https://reviews.llvm.org/D137205/new/
https://reviews.llvm.org/D137205
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