Often times, when an ArraySubscriptExpr was reported as null or
undefined, the bug report was difficult to understand, because the
analyzer explained why arr[i] has that value, but didn't realize that in
fact i's value is very important as well. This patch fixes this by
tracking the indices of arrays.
Differential Revision: https://reviews.llvm.org/D63080
llvm-svn: 363510
Tracking those can help to provide much better diagnostics in many cases.
In general, most of the visitor machinery should be refactored to allow
tracking the origin of arbitrary values.
rdar://36039765
Differential Revision: https://reviews.llvm.org/D51131
llvm-svn: 340475