aaron.ballman added inline comments.
================
Comment at: clang-tools-extra/clang-tidy/llvm/AvoidCastInConditionalCheck.cpp:18
+
+AST_MATCHER(Expr, isMacroID) { return Node.getExprLoc().isMacroID(); }
+} // namespace ast_matchers
----------------
hintonda wrote:
> aaron.ballman wrote:
> > hintonda wrote:
> > > @aaron.ballman: This matcher seems genuinely useful. What do you think
> > > about moving it to ASTMatchers.h?
> > I think that adding something like this might be a good idea. We don't have
> > any notion of source locations in the AST matching syntax currently, and
> > I'm not certain whether that's a good thing or not here. I'm mildly
> > uncomfortable that this matcher operates on an `Expr` but then internally
> > uses a source location from that expression and I wonder if we would rather
> > introduce source location matching. For instance, what if the user cares
> > about the difference between `getExprLoc()` and `getBeginLoc()` for some
> > reason?
> Well, you can attach it to whatever you want, so I'm not sure that's a
> problem. Alternatively, you have to check each location yourself. In my
> case, that was multiple places, so putting it in the matcher cleaned up the
> code.
>
> I need to verify it, but it seems that it triggered when any macros were in
> the range, but I need to look closer into that to understand the behavior.
> I'll check it out and get back to you.
> Well, you can attach it to whatever you want, so I'm not sure that's a
> problem.
How does a caller of this AST matcher indicate that they want it to match on
`Node.getBeingLoc().isMacroID()` instead of what's written now? If the answer
is "they write a different matcher", then that's what I think could be a
problem. There's a lot of ways to get a source location (and a lot of different
kinds of source locations), and I think matching on those can be very useful
functionality. So I think the idea of the matcher is good, I'm just not certain
whether we want it to look like `AST_MATCHER(Expr, isMacroID);` or
`AST_MATCHER(SourceLocation, isMacroID);` or something else.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D59802/new/
https://reviews.llvm.org/D59802
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