baloghadamsoftware marked an inline comment as done.
baloghadamsoftware added inline comments.
================
Comment at: clang/lib/StaticAnalyzer/Checkers/IteratorModeling.cpp:541-542
+ BR.markInteresting(It1);
+ if (const auto &LCV1 = It1.getAs<nonloc::LazyCompoundVal>()) {
+ BR.markInteresting(LCV1->getRegion());
+ }
----------------
baloghadamsoftware wrote:
> Szelethus wrote:
> > NoQ wrote:
> > > baloghadamsoftware wrote:
> > > > NoQ wrote:
> > > > > I'm opposed to this code for the same reason that i'm opposed to it
> > > > > in the debug checker. Parent region is an undocumented implementation
> > > > > detail of `RegionStore`. It is supposed to be immaterial to the user.
> > > > > You should not rely on its exact value.
> > > > >
> > > > > @baloghadamsoftware Can we eliminate all such code from iterator
> > > > > checkers and instead identify all iterators by regions in which
> > > > > they're stored? Does my improved C++ support help with this anyhow
> > > > > whenever it kicks in?
> > > > How to find the region where it is stored? I am open to find better
> > > > solutions, but it was the only one I could find so far. If we ignore
> > > > `LazyCompoundVal` then everything falls apart, we can remove all the
> > > > iterator-related checkers.
> > > It's the region from which you loaded it. If you obtained it as
> > > `Call.getArgSVal()` then it's the parameter region for the call. If you
> > > obtained it as `Call.getReturnValue()` then it's the target region can be
> > > obtained by looking at the //construction context// for the call.
> > `LazyCompoundVal` and friends seem to be a constantly emerging headache for
> > almost everyone. For how long I've spent in the analyzer, and have
> > religiously studied conversations and your workbook about it, I still feel
> > anxious whenever it comes up.
> >
> > It would be great to have this documented in the code sometime.
> Do you mean `CallEvent::getParameterLocation()` for arguments? What is the
> //construction context// for the call? How can it be obtained?
I do not know exactly how many place `LazyCompoundVal` appears, but one place
for sure is in `MaterializeTemporaryExpr::getSubExpr()`. What to use there
instead?
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D75677/new/
https://reviews.llvm.org/D75677
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