Rollup of 7 pull requests
Successful merges:
- #109981 (Set commit information environment variables when building tools)
- #110348 (Add list of supported disambiguators and suffixes for intra-doc links in the rustdoc book)
- #110409 (Don't use `serde_json` to serialize a simple JSON object)
- #110442 (Avoid including dry run steps in the build metrics)
- #110450 (rustdoc: Fix invalid handling of nested items with `--document-private-items`)
- #110461 (Use `Item::expect_*` and `ImplItem::expect_*` more)
- #110465 (Assure everyone that `has_type_flags` is fast)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Don't use `serde_json` to serialize a simple JSON object
This avoids `rustc_data_structures` depending on `serde_json` which allows it to be compiled much earlier, unlocking most of rustc.
This used to not matter, but after #110407 we're not blocked on fluent anymore, which means that it's now a blocking edge.
This saves a few more seconds.
cc ````@Zoxc```` who added it recently
Implement StableHasher::write_u128 via write_u64
In https://github.com/rust-lang/rust/pull/110367#issuecomment-1510114777 the cachegrind diffs indicate that nearly all the regression is from this:
```
22,892,558 ???:<rustc_data_structures::sip128::SipHasher128>::slice_write_process_buffer
-9,502,262 ???:<rustc_data_structures::sip128::SipHasher128>::short_write_process_buffer::<8>
```
Which happens because the diff for that perf run swaps a `Hash::hash` of a `u64` to a `u128`. But `slice_write_process_buffer` is a `#[cold]` function, and is for handling hashes of arbitrary-length byte arrays.
Using the much more optimizer-friendly `u64` path twice to hash a `u128` provides a nice perf boost in some benchmarks.
Tagged pointers, now with strict provenance!
This is a big refactor of tagged pointers in rustc, with three main goals:
1. Porting the code to the strict provenance
2. Cleanup the code
3. Document the code (and safety invariants) better
This PR has grown quite a bit (almost a complete rewrite at this point...), so I'm not sure what's the best way to review this, but reviewing commit-by-commit should be fine.
r? `@Nilstrieb`
Remove some suspicious cast truncations
These truncations were added a long time ago, and as best I can tell without a perf justification. And with rust-lang/rust#110410 it has become perf-neutral to not truncate anymore. We worked hard for all these bits, let's use them.
Turns out
- `owning_ref` is unsound due to `Box` aliasing stuff
- `rustc` doesn't need 99% of the `owning_ref` API
- `rustc` can use a far simpler abstraction that is `OwnedSlice`
