Add next_up and next_down for f32/f64 - take 2
This is a revival of https://github.com/rust-lang/rust/pull/88728 which staled due to inactivity of the original author. I've address the last review comment.
---
This is a pull request implementing the features described at https://github.com/rust-lang/rfcs/pull/3173.
`@rustbot` label +T-libs-api -T-libs
r? `@scottmcm`
cc `@orlp`
std: use realstd fast key when building tests
Under `cfg(test)`, the `std` crate is not the actual standard library, just any old crate we are testing. It imports the real standard library as `realstd`, and then does some careful `cfg` magic so that the crate built for testing uses the `realstd` global state rather than having its own copy of that.
However, this was not done for all global state hidden in std: the 'fast' version of thread-local keys, at least on some platforms, also involves some global state. Specifically its macOS version has this [`static REGISTERED`](bc63d5a26a/library/std/src/sys/unix/thread_local_dtor.rs (L62)) that would get duplicated. So this PR imports the 'fast' key type from `realstd` rather than using the local copy, to ensure its internal state (and that of the functions it calls) does not get duplicated.
I also noticed that the `__OsLocalKeyInner` is unused under `cfg(target_thread_local)`, so I removed it for that configuration. There was a comment saying macOS picks between `__OsLocalKeyInner` and `__FastLocalKeyInner` at runtime, but I think that comment is outdated -- I found no trace of such a runtime switching mechanism, and the library still check-builds on apple targets with this PR. (I don't have a Mac so I cannot actually run it.)
Don't lint literal `None` from expansion
This addresses https://github.com/rust-lang/rust-clippy/pull/9288#issuecomment-1229398524: If the literal `None` is from expansion, we never lint. This is correct because e.g. replacing the call to `option_env!` with whatever that macro expanded to at the time of linting is certainly wrong.
changelog: Don't lint [`partialeq_to_none`] for macro-expansions
Move empty diagnostics workaround back into the server
This only touches on the diagnostics in one place instead of multiple as was previously done, since all published diagnostics will go through this code path anyways.
Closes https://github.com/rust-lang/rust-analyzer/issues/13130
rustc_middle: Remove `Visibility::Invisible`
It had a different meaning in the past, but now it's only used as an implementation detail of import resolution.
no alignment check during interning
This should fix https://github.com/rust-lang/rust/issues/101034
r? `@oli-obk`
Unfortunately we don't have a self-contained testcase for this problem. I am not sure how it can be triggered...
Some papercuts on error::Error
Renames the chain method, since I chain could mean anything and doesn't refer to a chain of sources (cc #58520) (and adds a comment explaining why sources is not a provided method on Error). Renames arguments to the request method from `req` to `demand` since the type is `Demand` rather than Request or Requisition.
r? ``@yaahc``
Add mention of `BufReader` in `Read::bytes` docs
There is a general paragraph about `BufRead` in the `Read` trait's docs, however using `bytes` without `BufRead` *always* has a large impact, due to reads of size 1.
`@rustbot` label +A-docs
Add standard C error function aliases to last_os_error
This aids the discoverability of `io::Error::last_os_error()` by linking to commonly used error number functions from C/C++.
I've seen a few people not realize this exists, so hopefully this helps draw attention to the API to encourage using it over integer error codes.
Box::from(slice): Clarify that contents are copied
A colleague mentioned that they interpreted the old text
as saying that only the pointer and the length are copied.
Add a clause so it is more clear that the pointed to contents
are also copied.
Add GDB/LLDB pretty-printers for NonZero types
Add GDB/LLDB pretty-printers for `NonZero` types.
These pretty-printers were originally implemented for IntelliJ Rust by ```@Kobzol``` in https://github.com/intellij-rust/intellij-rust/pull/5270.
Part of #29392.
std::io: migrate ReadBuf to BorrowBuf/BorrowCursor
This PR replaces `ReadBuf` (used by the `Read::read_buf` family of methods) with `BorrowBuf` and `BorrowCursor`.
The general idea is to split `ReadBuf` because its API is large and confusing. `BorrowBuf` represents a borrowed buffer which is mostly read-only and (other than for construction) deals only with filled vs unfilled segments. a `BorrowCursor` is a mostly write-only view of the unfilled part of a `BorrowBuf` which distinguishes between initialized and uninitialized segments. For `Read::read_buf`, the caller would create a `BorrowBuf`, then pass a `BorrowCursor` to `read_buf`.
In addition to the major API split, I've made the following smaller changes:
* Removed some methods entirely from the API (mostly the functionality can be replicated with two calls rather than a single one)
* Unified naming, e.g., by replacing initialized with init and assume_init with set_init
* Added an easy way to get the number of bytes written to a cursor (`written` method)
As well as simplifying the API (IMO), this approach has the following advantages:
* Since we pass the cursor by value, we remove the 'unsoundness footgun' where a malicious `read_buf` could swap out the `ReadBuf`.
* Since `read_buf` cannot write into the filled part of the buffer, we prevent the filled part shrinking or changing which could cause underflow for the caller or unexpected behaviour.
## Outline
```rust
pub struct BorrowBuf<'a>
impl Debug for BorrowBuf<'_>
impl<'a> From<&'a mut [u8]> for BorrowBuf<'a>
impl<'a> From<&'a mut [MaybeUninit<u8>]> for BorrowBuf<'a>
impl<'a> BorrowBuf<'a> {
pub fn capacity(&self) -> usize
pub fn len(&self) -> usize
pub fn init_len(&self) -> usize
pub fn filled(&self) -> &[u8]
pub fn unfilled<'this>(&'this mut self) -> BorrowCursor<'this, 'a>
pub fn clear(&mut self) -> &mut Self
pub unsafe fn set_init(&mut self, n: usize) -> &mut Self
}
pub struct BorrowCursor<'buf, 'data>
impl<'buf, 'data> BorrowCursor<'buf, 'data> {
pub fn clone<'this>(&'this mut self) -> BorrowCursor<'this, 'data>
pub fn capacity(&self) -> usize
pub fn written(&self) -> usize
pub fn init_ref(&self) -> &[u8]
pub fn init_mut(&mut self) -> &mut [u8]
pub fn uninit_mut(&mut self) -> &mut [MaybeUninit<u8>]
pub unsafe fn as_mut(&mut self) -> &mut [MaybeUninit<u8>]
pub unsafe fn advance(&mut self, n: usize) -> &mut Self
pub fn ensure_init(&mut self) -> &mut Self
pub unsafe fn set_init(&mut self, n: usize) -> &mut Self
pub fn append(&mut self, buf: &[u8])
}
```
## TODO
* ~~Migrate non-unix libs and tests~~
* ~~Naming~~
* ~~`BorrowBuf` or `BorrowedBuf` or `SliceBuf`? (We might want an owned equivalent for the async IO traits)~~
* ~~Should we rename the `readbuf` module? We might keep the name indicate it includes both the buf and cursor variations and someday the owned version too. Or we could change it. It is not publicly exposed, so it is not that important~~.
* ~~`read_buf` method: we read into the cursor now, so the `_buf` suffix is a bit weird.~~
* ~~Documentation~~
* Tests are incomplete (I adjusted existing tests, but did not add new ones).
cc https://github.com/rust-lang/rust/issues/78485, https://github.com/rust-lang/rust/issues/94741
supersedes: https://github.com/rust-lang/rust/pull/95770, https://github.com/rust-lang/rust/pull/93359fixes#93305
Ignore `match_like_matches_macro` when there is comment
Closes#9164
changelog: [`match_like_matches_macro`] is ignored when there is some comment inside the match block.
Also add `span_contains_comment` util to check if given span contains comments.
Sunset RLS
This removes RLS per the plan outlined in https://blog.rust-lang.org/2022/07/01/RLS-deprecation.html. This replaces the `rls` executable with a small program which will display an alert telling the user that RLS is no longer available.
An overview of the changes here:
* Removes the rls submodule and replaces it with a small stub program.
* `rls` is removed from `./x.py install`. I do not think users running `install` will need the stub.
* `rls` is removed from `./x.py test`, it doesn't have any tests.
Other things of note:
* I kept `DIST_REQUIRE_ALL_TOOLS` even though it is no longer needed, with the thought that it could be useful in the feature. However, I could remove it if desired.
* I kept `extra_deps` in `tool_extended` (which allows tools to depend on other things), even though it is no longer needed. This can also be removed if desired.
* ~~This keeps RLS in the macOS `pkg` installer and the Windows `msi` installer. I kinda lean towards removing it from those, but I'm not sure?~~ RLS has been removed from pkg and msi.
* This does not remove the analysis component. It is not clear if we should keep this or not. RLS was the primary user, but I think there are a few users that have made tools around it.
* There will be several followup steps after this PR:
* Updating the toolstate repo to remove RLS.
* Updating documentation, such as rustc-dev-guide, to remove references to RLS.
The alert looks like this in VSCode:
<img width="989" alt="image" src="https://user-images.githubusercontent.com/43198/185817530-930c5842-24b5-4162-a213-016a25810955.png">
In Sublime it looks similar.
I would appreciate if others could help test with other editors such as vim or Emacs.
Move EH personality functions to std
These were previously in the panic_unwind crate with dummy stubs in the
panic_abort crate. However it turns out that this is insufficient: we
still need a proper personality function even with -C panic=abort to
handle the following cases:
1) `extern "C-unwind"` still needs to catch foreign exceptions with -C
panic=abort to turn them into aborts. This requires landing pads and a
personality function.
2) ARM EHABI uses the personality function when creating backtraces.
The dummy personality function in panic_abort was causing backtrace
generation to get stuck in a loop since the personality function is
responsible for advancing the unwind state to the next frame.
Fixes#41004
Add pointer masking convenience functions
This PR adds the following public API:
```rust
impl<T: ?Sized> *const T {
fn mask(self, mask: usize) -> *const T;
}
impl<T: ?Sized> *mut T {
fn mask(self, mask: usize) -> *const T;
}
// mod intrinsics
fn mask<T>(ptr: *const T, mask: usize) -> *const T
```
This is equivalent to `ptr.map_addr(|a| a & mask)` but also uses a cool llvm intrinsic.
Proposed in https://github.com/rust-lang/rust/pull/95643#issuecomment-1121562352
cc `@Gankra` `@scottmcm` `@RalfJung`
r? rust-lang/libs-api
