[PATCH] D89749: SourceManager: Don't allocate an SLocEntry until it's loaded
Duncan P. N. Exon Smith via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Mon Oct 19 16:17:28 PDT 2020
dexonsmith created this revision.
dexonsmith added reviewers: teemperor, Bigcheese.
Herald added a subscriber: ributzka.
dexonsmith requested review of this revision.
Convert `SLocEntryLoaded` into an index vector into
`LoadedSLocEntryTable`, where 0 indicates "not loaded", and change
`LoadedSLocEntryTable` to only include an `SLocEntry` if it has been
loaded. This makes the allocation for an unloaded `SLocEntry` 6x smaller
(24B => 4B), dramatically improving memory usage with large / many
modules.
This increases memory usage for a *loaded* `SLocEntry` slightly.
https://reviews.llvm.org/D89749
Files:
clang/include/clang/Basic/SourceManager.h
clang/lib/Basic/SourceManager.cpp
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