If we have a cause containing `ValuePairs::PolyTraitRefs` but neither
TraitRef has any escaping bound regions then we report the same error as
for `ValuePairs::TraitRefs`.
Borrowck: refactor visited map to a bitset
This PR refactors `Borrows` and the `precompute_borrows_out_of_scope` function so that this initial phase has a much reduced memory pressure. This is achieved by reducing what is stored on the heap, and also reusing heap memory as much as possible.
[experiment] remove `#[inline]` from rustc_query_system::plumbing
These functions have a ton of generic parameters and are instantiated
over and over again. Hopefully this will reduce binary bloat and speed
up bootstrapping times.
r? `@cjgillot`
Allow building rustdoc without first building rustc (MVP)
## Motivation
The compile times for rustc are extremely long and a major issue for
recruiting new contributors to rustdoc. People interested in joining
often give up after running into issues with submodules or python
versions. stage1 rustdoc fundamentally doesn't care about bootstrapping
or stages, it just needs `rustc_private` available.
## Summary of Changes
- Add an opt-in `[rust] download_rustc` option
- Determine the version of the compiler to download using `log --author=bors`
- Do no work for any component other than `Rustdoc` for any stage. Instead, copy the CI artifacts from the downloaded sysroot stage0/ to stage0-sysroot/ or stage1/ in `Sysroot`. This is done with an `ENABLE_DOWNLOAD_STAGE1` constant which is off by default.
- Don't download different versions of rustfmt or cargo - those should still use the beta version (rustfmt especially).
The vast majority of work is done in bootstrap.py, which downloads the artifacts and extracts them to stage0/ in place of the beta compiler. Rustbuild just takes care of copying the artifacts to stage1 if necessary.
## Future work
- I turned off verification for the commit tarballs because the .sha256 URLs gave a 404. This seems not ideal, it would be nice to start signing them.
- This will break if you rebase an old enough branch (I think commits are kept at most 160 days?). This doesn't need to be supported, but it would be nice to give a reasonable error. https://github.com/rust-lang/rust/pull/79540#issuecomment-751481291
- Right now, every time you rebase, stage0 tools (bootstrap, tidy, ...) will have to be recompiled. Additionally running `x.py setup tools` will compile rustbuild twice. Instead, this should download a separate beta compiler for stage0 and only use CI artifacts for stage1 onward. https://github.com/rust-lang/rust/pull/79540#issuecomment-757047321
- Add `x.py setup tools` to enable this conveniently (it doesn't make sense to use this for compiler developers). cb5d8c8522
- Compile a new version of tracing so that rustdoc still gets debug logging (since CI artifacts always disable `debug` and `trace` logging). https://github.com/rust-lang/rust/pull/79540#issuecomment-742756411, 6a5d512420
- Right now only rustdoc is ever rebuilt. This is not ideal and should probably at least compile compiler tools (rustfmt, clippy, miri). https://github.com/rust-lang/rust/pull/79540#issuecomment-775634693
- Using `git log --author=bors` sometimes breaks. This should use `git merge-base` instead. https://github.com/rust-lang/rust/pull/79540#discussion_r572572280
- It would be nice to support cross-compiling the standard library. Right now this gives an assertion failure I think.
Some of this work has already been done in (the history for) 673476c785.
Fix derived PartialOrd operators
The derived implementation of `partial_cmp` compares matching fields one
by one, stopping the computation when the result of a comparison is not
equal to `Some(Equal)`.
On the other hand the derived implementation for `lt`, `le`, `gt` and
`ge` continues the computation when the result of a field comparison is
`None`, consequently those operators are not transitive and inconsistent
with `partial_cmp`.
Fix the inconsistency by using the default implementation that fall-backs
to the `partial_cmp`. This also avoids creating very deeply nested
closures that were quite costly to compile.
Fixes#81373.
Helps with #81278, #80118.
This renames the variants in HIR UnOp from
enum UnOp {
UnDeref,
UnNot,
UnNeg,
}
to
enum UnOp {
Deref,
Not,
Neg,
}
Motivations:
- This is more consistent with the rest of the code base where most enum
variants don't have a prefix.
- These variants are never used without the `UnOp` prefix so the extra
`Un` prefix doesn't help with readability. E.g. we don't have any
`UnDeref`s in the code, we only have `UnOp::UnDeref`.
- MIR `UnOp` type variants don't have a prefix so this is more
consistent with MIR types.
- "un" prefix reads like "inverse" or "reverse", so as a beginner in
rustc code base when I see "UnDeref" what comes to my mind is
something like "&*" instead of just "*".
This renames the variants in HIR UnOp from
enum UnOp {
UnDeref,
UnNot,
UnNeg,
}
to
enum UnOp {
Deref,
Not,
Neg,
}
Motivations:
- This is more consistent with the rest of the code base where most enum
variants don't have a prefix.
- These variants are never used without the `UnOp` prefix so the extra
`Un` prefix doesn't help with readability. E.g. we don't have any
`UnDeref`s in the code, we only have `UnOp::UnDeref`.
- MIR `UnOp` type variants don't have a prefix so this is more
consistent with MIR types.
- "un" prefix reads like "inverse" or "reverse", so as a beginner in
rustc code base when I see "UnDeref" what comes to my mind is
something like "&*" instead of just "*".
