Sometimes it is necessary for handling vector to scalar pair transmutes,
but if the types are the same there is no need for this.
This improves runtime performance on simple-raytracer by 12%.
Strengthen validation of FFI attributes
Previously, `codegen_attrs` validated the attributes `#[ffi_pure]`, `#[ffi_const]`, and `#[ffi_returns_twice]` to make sure that they were only used on foreign functions. However, this validation was insufficient in two ways:
1. `codegen_attrs` only sees items for which code must be generated, so it was unable to raise errors when the attribute was incorrectly applied to macros and the like.
2. the validation code only checked that the item with the attr was foreign, but not that it was a foreign function, allowing these attributes to be applied to foreign statics as well.
This PR moves the validation to `check_attr`, which sees all items. It additionally changes the validation to ensure that the attribute's target is `Target::ForeignFunction`, only allowing the attributes on foreign functions and not foreign statics. Because these attributes are unstable, there is no risk for backwards compatibility. The changes also ending up making the code much easier to read.
This PR is best reviewed commit by commit. Additionally, I was considering moving the tests to the `attribute` subdirectory, to get them out of the general UI directory. I could do that as part of this PR or a follow-up, as the reviewer prefers.
CC: #58328, #58329
Rollup of 6 pull requests
Successful merges:
- #107389 (Fixing confusion between mod and remainder)
- #107442 (improve panic message for slice windows and chunks)
- #107470 (Small bootstrap improvements)
- #107487 (Make the "extra if in let...else block" hint a suggestion)
- #107499 (Do not depend on Generator trait when deducing closure signature)
- #107533 (Extend `-Z print-type-sizes` to distinguish generator upvars+locals from "normal" fields.)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Do not depend on Generator trait when deducing closure signature
1. Do not depend on `Generator` trait when deducing closure signature.
2. Compare the name of the `Generator::Return` associated item, rather than its order in the trait. Seems more stable this way.
Small bootstrap improvements
- i/o-less check for `xz` availability
- cache result of NixOS detection
- load correct `bootstrap` module even when a package of that name is installed
- no `-W semicolon_in_expressions_from_macros` – it is warn-by-default
- one type per variable (making dynamic typing less confusing)
- integrate python-side `--help` flag into the argument parser (makes `-hv` work as a short form of `--help --verbose`)
I even checked that it works with Python 2.
improve panic message for slice windows and chunks
before:
```text
thread 'main' panicked at 'size is zero', /rustc/1e225413a21fa69570bd3fefea9eb05e33f8b917/library/core/src/slice/mod.rs:809:44
```
```text
thread 'main' panicked at 'assertion failed: `(left != right)`
left: `0`,
right: `0`: chunks cannot have a size of zero', /rustc/1e225413a21fa69570bd3fefea9eb05e33f8b917/library/core/src/slice/mod.rs:843:9
```
after:
```text
thread 'main' panicked at 'chunk size must be non-zero', src/main.rs:4:22
```
fixes https://github.com/rust-lang/rust/issues/107437
Fixing confusion between mod and remainder
Like many programming languages, rust too confuses remainder and modulus. The `%` operator and the associated `Rem` trait is (as the trait name suggests) the remainder, but since most people are linguistically more familiar with the modulus the documentation sometimes claims otherwise. This PR tries to fix this problem in rustc.
Update cargo
18 commits in 3c5af6bed9a1a243a693e8e22ee2486bd5b82a6c..e84a7928d93a31f284b497c214a2ece69b4d7719 2023-01-24 15:48:15 +0000 to 2023-01-31 22:18:09 +0000
- chore: Add autolabel for `Command-*` labels (rust-lang/cargo#11664)
- Update cross test instructions for aarch64-apple-darwin (rust-lang/cargo#11663)
- Make cargo install report needed features (rust-lang/cargo#11647)
- docs(contrib): Remove out-of-date process step (rust-lang/cargo#11662)
- Do not error for `auth-required: true` without `-Z sparse-registry` (rust-lang/cargo#11661)
- Warn on commits to non-default branches. (rust-lang/cargo#11655)
- Avoid saving the same future_incompat warning multiple times (rust-lang/cargo#11648)
- Mention current default value in `publish.timeout` docs (rust-lang/cargo#11652)
- Make cargo aware of dwp files. (rust-lang/cargo#11572)
- Reduce target info rustc query calls (rust-lang/cargo#11633)
- Bump to 0.70.0; update changelog (rust-lang/cargo#11640)
- Enable sparse protocol in CI (rust-lang/cargo#11632)
- Fix split-debuginfo support detection (rust-lang/cargo#11347)
- refactor(toml): Move `TomlWorkspaceDependency` out of `TomlDependency` (rust-lang/cargo#11565)
- book: describe how the current resolver sometimes duplicates deps (rust-lang/cargo#11604)
- `cargo add` check `[dependencies]` order without considering the dotted item (rust-lang/cargo#11612)
- Link CoC to www.rust-lang.org/conduct.html (rust-lang/cargo#11622)
- Add more labels to triagebot (rust-lang/cargo#11621)
r? `@ghost`
If you do `derive(PartialEq)` on a packed struct, the output shown by
`-Zunpretty=expanded` includes expressions like this:
```
{ self.x } == { other.x }
```
This is invalid syntax. This doesn't break compilation, because the AST
nodes are constructed within the compiler. But it does mean anyone using
`-Zunpretty=expanded` output as a guide for hand-written impls could get
a nasty surprise.
This commit fixes things by instead using this form:
```
({ self.x }) == ({ other.x })
```
Fix version declared for semicolon_inside_block and semicolon_outside…
As per Issue #10244, the lint were documentated
as being part of 1.66.0 but will actually be
released 1.68.0 .
changelog: [`semicolon_inside_block`]: Documentation fix
Fixes#10244
Replace unwrap with ? in TcpListener doc
The example in TcpListener doc returns `std::io::Result<()>` but the code inside the function uses `unwrap()` instead of `?`.
PointeeInfo is advisory only
https://github.com/rust-lang/rust/pull/107248 fixed PointeeInfo being used in ways that don't actually work. Hopefully this comments helps avoid such issues in the future.
Cc ``@eddyb``
Track bound types like bound regions
When we instantiate bound types into placeholder types, we throw away the names for some reason. These names are particularly useful for error reporting once we have `for<T>` binders.
r? types
small refactor to new projection code
extract `eq_term_and_make_canonical_response` into a helper function which also is another guarantee that the expected term does not influence candidate selection for projections.
also change `evaluate_all(vec![single_goal])` to use `evaluate_goal`.
the second commit now also adds a `debug_assert!` to `evaluate_goal`.
