[PATCH] D117348: [Preprocessor] Reduce the memory overhead of `#define` directives

Aaron Ballman via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Thu Jan 20 08:16:55 PST 2022

aaron.ballman added inline comments.

Comment at: clang/lib/Lex/MacroInfo.cpp:33
+// MacroInfo is expected to take 40 bytes on platforms with an 8 byte pointer.
+template <int> class MacroInfoSizeChecker {
dexonsmith wrote:
> aaron.ballman wrote:
> > dexonsmith wrote:
> > > aaron.ballman wrote:
> > > > Should we do this dance for 32-bit systems as well?
> > > Do I remember correctly that `SourceLocation`'s size recently became configurable? Or maybe it will be soon? Should that be factored in somehow?
> > Are you thinking about this review https://reviews.llvm.org/D97204 or something else?
> Yes, I think that's the one.
Yeah, it's probably not a bad idea to use `sizeof(SourceLocation)` instead of calculating the size manually for that bit.



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