nridge marked 4 inline comments as done. nridge added inline comments.
================ Comment at: clang-tools-extra/clangd/Selection.cpp:261 + // consider it selected. + if (!SeenMacroCalls.insert(ArgStart).second) { + return NoTokens; ---------------- sammccall wrote: > sammccall wrote: > > Given the following program: > > ``` > > #define SQUARE(x) x * x; > > int four = [[SQUARE(2)]]; > > ``` > > We're going to now report the binary operator and one of the operands as > > selected and not the other, which doesn't seem desirable. > > > > I think we want to accept macro-selected || arg-selected, so probably doing > > the current "non-argument macro expansion" first unconditionally or > > factoring it out into a function. > > > > This will change the behavior of `int four = [[SQUARE]](2)` to consider the > > literal children selected too, I think this is fine. > I don't think it's a good idea to add hidden state and side-effects to > testChunk() - it breaks a lot of assumptions that help reason about the code, > and using `mutable` hides the violation of them. > (And a possible source of bugs - this is first in traversal order rather than > first in source order - these are mostly but IIRC not always the same). > > Instead I think you can do this statelessly: from the top-level spelling > location, walk down with `SM.getMacroArgExpandedLocation` until you hit the > target FileID (this is the first-expansion of first-expansion of > first-expansion...) or the FileID stops changing (you've reached the > innermost macro invocation, and your target location was on a different > branch). I agree that adding state is not great. I thought it was icky as I was writing it, I just couldn't think of an alternative. Thank you for suggesting one! I implemented what you suggested, and it seems to work. I did want to ask a clarifying question to make sure I understand correctly: when an argument occurs multiple times in a macro exapnsion, the occurrences will have distinct `FileID`s (as opposed just different offsets in the same macro `FileID`)? Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D72041/new/ https://reviews.llvm.org/D72041 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits