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[analyzer] Admit that we can't simplify the newly produced mixed Loc/NonLoc expressions.

Authored by NoQ on Jul 24 2018, 12:13 PM.



Add one more defensive check to prevent crashes on trying to simplify a SymSymExpr with different Loc-ness of operands. This fix is similar to D49703 and addresses a regression caused by D48650.

When an operation between a nonloc::LocAsInteger and a non-pointer symbol is performed, the LocAsInteger-specific part of information is lost. When the non-pointer symbol is collapsing into a constant, we cannot easily re-evaluate the result, because we need to recover the missing LocAsInteger-specific information (eg., integer type, or the very fact that this pointer was at some point converted to an integer).

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Event Timeline

NoQ created this revision.Jul 24 2018, 12:13 PM
NoQ edited the summary of this revision. (Show Details)Jul 24 2018, 12:52 PM
george.karpenkov requested changes to this revision.Jul 24 2018, 1:02 PM
george.karpenkov added inline comments.

could we eliminate the code duplication with lines 1308-1310?

This revision now requires changes to proceed.Jul 24 2018, 1:02 PM

It fixes Xerces verification. Thanks.

NoQ requested review of this revision.Jul 25 2018, 4:14 PM
NoQ marked an inline comment as done.
NoQ added inline comments.

Moved to D49826 because it's much larger than this patch.

george.karpenkov accepted this revision.Jul 27 2018, 4:12 PM
This revision is now accepted and ready to land.Jul 27 2018, 4:12 PM
NoQ closed this revision.EditedJul 31 2018, 12:28 PM
NoQ marked an inline comment as done.

Committed in rC338425 but i accidentally screwed the revision link.