xazax.hun added inline comments.
================ Comment at: clang-tools-extra/clang-tidy/bugprone/UncheckedOptionalAccessCheck.cpp:84 + if (!BlockToOutputState || + BlockToOutputState->size() <= Context->getCFG().getExit().getBlockID()) + return; ---------------- xazax.hun wrote: > ymandel wrote: > > xazax.hun wrote: > > > xazax.hun wrote: > > > > Could the size of the vector ever be wrong? Should this be an assert > > > > instead? > > > Whoops, after the update this comment is out of place, now it supposed to > > > be on line 60. > > Based on my reading, it is a rare, but possible condition. Basically, we > > need code where the exit block is unreachable, which I believe can happen > > in weird cases like: > > > > ``` > > while(true) {...} > > ``` > > https://godbolt.org/z/rfEnfaWTv -- notice the lack of predecessors for the > > exit block. > > > > See the code here, which follows the ordering of the blocks and doesn't > > force blocks to be processed: > > > > https://github.com/llvm/llvm-project/blob/main/clang/lib/Analysis/FlowSensitive/TypeErasedDataflowAnalysis.cpp#L337-L364 > Interesting. Since we already have optionals in the vector, I assumed we will > always have matching size. I think we might want to change this so there is > only one way for the analysis to not provide a state for a basic block to > make this a bit less confusing, Actually, in the linked code I see ` BlockStates.resize(CFCtx.getCFG().size(), llvm::None);`. So I would expect the size to be always right with possibly some `None`s for the nodes that were not processed. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D121120/new/ https://reviews.llvm.org/D121120 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits