New values:
- Split Dynamic into Open/Preamble
- Add Background (previously was just Unknown)
- Soon: stdlib index
This requires extending to 16 bits, which fits within the padding of Symbol.
Unfortunately we're also *serializing* SymbolOrigin as a fixed 8 bits.
Stop serializing SymbolOrigin:
- conceptually, the source is whoever indexes or *deserializes* a symbol
- deserialization takes SymbolOrigin as a parameter and stamps it on each sym
- this is a breaking format change
Differential Revision: https://reviews.llvm.org/D115243
Previously we did not record local class declarations. Now with features like
findImplementation and typeHierarchy, we have a need to index such local
classes to accurately report subclasses and implementations of methods.
Performance testing results:
- No changes in indexing timing.
- No significant change in memory usage.
- **1%** increase in #relations.
- **0.17%** increase in #refs.
- **0.22%** increase #symbols.
**New index stats**
Time to index: **4:13 min**
memory usage **543MB**
number of symbols: **521.5K**
number of refs: **8679K**
number of relations: **49K**
**Base Index stats**
Time to index: **4:15 min**
memory usage **542MB**
number of symbols: **520K**
number of refs: **8664K**
number of relations: **48.5K**
Fixes: https://github.com/clangd/clangd/issues/644
Differential Revision: https://reviews.llvm.org/D94785
Sam McCall