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ac43ba8bb8
rust/compiler/rustc_codegen_ssa
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Aaron Hill cac431ba75
Store a DefId instead of an AdtDef in AggregateKind::Adt 
The `AggregateKind` enum ends up in the final mir `Body`. Currently,
any changes to `AdtDef` (regardless of how significant they are)
will legitimately cause the overall result of `optimized_mir` to change,
invalidating any codegen re-use involving that mir.

This will get worse once we start hashing the `Span` inside `FieldDef`
(which is itself contained in `AdtDef`).

To try to reduce these kinds of invalidations, this commit changes
`AggregateKind::Adt` to store just the `DefId`, instead of the full
`AdtDef`. This allows the result of `optimized_mir` to be unchanged
if the `AdtDef` changes in a way that doesn't actually affect any
of the MIR we build.
2021-12-22 14:36:34 -05:00
..
src Store a DefId instead of an AdtDef in AggregateKind::Adt 2021-12-22 14:36:34 -05:00
Cargo.toml Use object crate for .rustc metadata generation 2021-12-07 09:39:05 +01:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

README.md

Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.