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[analyzer] ObjCAutoreleaseWriteChecker: Support explicit autoreleasepools.

Authored by NoQ on Jun 3 2020, 2:54 AM.



This ASTMatchers-based checker currently supports only a whitelist of block-enumeration methods which are known to internally clear an autorelease pool. Extend this checker to detect writes within the scope of explicit @autoreleasepool statements.

Patch by Paul Pelzl!
(who can't participate in the discussion for IRL reasons; i'll address comments)

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NoQ created this revision.Jun 3 2020, 2:54 AM

Otherwise, LTGM


This looks a bit messy to me, but not critical.

NoQ updated this revision to Diff 268133.Jun 3 2020, 4:17 AM

Break up the huge twine into an old-school stream.

Lowkey change bug category to a standard category. Technically this is indeed a retain count error so the category is appropriate and it shouldn't matter to the user that it is coming from a different checker. But i'm still a bit worried because RetainCountChecker is so iconic to its users that they may be surprised if a new syntactic checker suddenly shows up under this category. Maybe we should make a new category, something like "Memory error (ARC)".

NoQ marked an inline comment as done.Jun 3 2020, 4:17 AM
vsavchenko accepted this revision.Jun 3 2020, 5:05 AM

Awesome, thanks!

This revision is now accepted and ready to land.Jun 3 2020, 5:05 AM
This revision was automatically updated to reflect the committed changes.
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