This commit migrates the in-tree `libcompiler_builtins` to the upstream version
at https://github.com/rust-lang-nursery/compiler-builtins. The upstream version
has a number of intrinsics written in Rust and serves as an in-progress rewrite
of compiler-rt into Rust. Additionally it also contains all the existing
intrinsics defined in `libcompiler_builtins` for 128-bit integers.
It's been the intention since the beginning to make this transition but
previously it just lacked the manpower to get done. As this PR likely shows it
wasn't a trivial integration! Some highlight changes are:
* The PR rust-lang-nursery/compiler-builtins#166 contains a number of fixes
across platforms and also some refactorings to make the intrinsics easier to
read. The additional testing added there also fixed a number of integration
issues when pulling the repository into this tree.
* LTO with the compiler-builtins crate was fixed to link in the entire crate
after the LTO process as these intrinsics are excluded from LTO.
* Treatment of hidden symbols was updated as previously the
`#![compiler_builtins]` crate would mark all symbol *imports* as hidden
whereas it was only intended to mark *exports* as hidden.
Add `Iterator::for_each`
This works like a `for` loop in functional style, applying a closure to
every item in the `Iterator`. It doesn't allow `break`/`continue` like
a `for` loop, nor any other control flow outside the closure, but it may
be a more legible style for tying up the end of a long iterator chain.
This was tried before in #14911, but nobody made the case for using it
with longer iterators. There was also `Iterator::advance` at that time
which was more capable than `for_each`, but that no longer exists.
The `itertools` crate has `Itertools::foreach` with the same behavior,
but thankfully the names won't collide. The `rayon` crate also has a
`ParallelIterator::for_each` where simple `for` loops aren't possible.
> I really wish we had `for_each` on seq iterators. Having to use a
> dummy operation is annoying. - [@nikomatsakis][1]
[1]: https://github.com/nikomatsakis/rayon/pull/367#issuecomment-308455185
This works like a `for` loop in functional style, applying a closure to
every item in the `Iterator`. It doesn't allow `break`/`continue` like
a `for` loop, nor any other control flow outside the closure, but it may
be a more legible style for tying up the end of a long iterator chain.
This was tried before in #14911, but nobody made the case for using it
with longer iterators. There was also `Iterator::advance` at that time
which was more capable than `for_each`, but that no longer exists.
The `itertools` crate has `Itertools::foreach` with the same behavior,
but thankfully the names won't collide. The `rayon` crate also has a
`ParallelIterator::for_each` where simple `for` loops aren't possible.
> I really wish we had `for_each` on seq iterators. Having to use a
> dummy operation is annoying. - [@nikomatsakis][1]
[1]: https://github.com/nikomatsakis/rayon/pull/367#issuecomment-308455185
add `FromStr` Impl for `char`
fixes#24939.
is it possible to use pub(restricted) instead of using a stability attribute for the internal error representation? is it needed at all?
Allocator integration
Lets start getting some feedback on `trait Alloc`.
Here is:
* the `trait Alloc` itself,
* the `struct Layout` and `enum AllocErr` that its API relies on
* a `struct HeapAlloc` that exposes the system allocator as an instance of `Alloc`
* an integration of `Alloc` with `RawVec`
* ~~an integration of `Alloc` with `Vec`~~
TODO
* [x] split `fn realloc_in_place` into `grow` and `shrink` variants
* [x] add `# Unsafety` and `# Errors` sections to documentation for all relevant methods
* [x] remove `Vec` integration with `Allocator`
* [x] add `allocate_zeroed` impl to `HeapAllocator`
* [x] remove typedefs e.g. `type Size = usize;`
* [x] impl `trait Error` for all error types in PR
* [x] make `Layout::from_size_align` public
* [x] clarify docs of `fn padding_needed_for`.
* [x] revise `Layout` constructors to ensure that [size+align combination is valid](https://github.com/rust-lang/rust/pull/42313#issuecomment-306845446)
* [x] resolve mismatch re requirements of align on dealloc. See [comment](https://github.com/rust-lang/rust/pull/42313#issuecomment-306202489).
Add `_` to the list of keywords
also, make sure the keyword table is correctly spaced
note: the reference also needs to be updated. This is not the only way to do this in the grammar, but it's my preferred way.
Autogenerate stubs and SUMMARY.md in the unstable book
Removes a speed bump in compiler development by autogenerating stubs for features in the unstable book. See #42454 for discussion.
The PR contains three commits, separated in order to make review easy:
* The first commit converts the tidy tool from a binary crate to a crate that contains both a library and a binary. In the second commit, we'll use the tidy library
* The second and main commit introduces autogeneration of SUMMARY.md and feature stub files
* The third commit turns off the tidy lint that checks for features without a stub, and removes the stub files. A separate commit due to the large number of files touched
Members of the doc team who wish to document some features can either do this (where `$rustsrc` is the root of the rust repo git checkout):
1. cd to `$rustsrc/src/tools/unstable-book-gen` and then do `cargo run $rustsrc/src $rustsrc/src/doc/unstable-book` to put the stubs into the unstable book
2. cd to `$rustsrc` and run `git ls-files --others --exclude-standard` to list the newly added stubs
3. choose a file to edit, then `git add` it and `git commit`
4. afterwards, remove all changes by the tool by doing `git --reset hard` and `git clean -f`
Or they can do this:
1. remove the comment marker in `src/tools/tidy/src/unstable_book.rs` line 122
2. run `./x.py test src/tools/tidy` to list the unstable features which only have stubs
3. revert the change in 1
3. document one of the chosen unstable features
The changes done by this PR also allow for further development:
* tidy obtains information about tracking issues. We can now forbid differing tracking issues between differing `#![unstable]` annotations. I haven't done this but plan to in a future PR
* we now have a general framework for generating stuff for the unstable book at build time. Further changes can autogenerate a list of the API a given library feature exposes.
The old way to simply click through the documentation after it has been uploaded to rust-lang.org works as well.
r? @nagisa
Fixes#42454
Remove struct_field_attributes feature gate
Part of #41681. ~This PR only removes the feature gate; this *does not* update any documentations.~ This PR removes the feature gate and the corresponding chapter of the Unstable Book.
I'm not very sure about the changes I made though... Just followed the stabilization guideline.
r? @nikomatsakis
Build instruction profiler runtime as part of compiler-rt
r? @alexcrichton
This is #38608 with some fixes.
Still missing:
- [x] testing with profiler enabled on some builders (on which ones? Should I add the option to some of the already existing configurations, or create a new configuration?);
- [x] enabling distribution (on which builders?);
- [x] documentation.
Add max and min to Ord
Pursuant to issue #25663, this PR adds max and min methods with default implementations to std::cmp::Ord. It also modifies std::cmp::max|min to internally alias to Ord::max|min, so that any overrides of the default implementations are automatically used by std::cmp::max|min.
Closes#25663
The Rustdoc book
A work-in-progress start for docs for rustdoc.
This doesn't actually generate the docs yet; I wanted to open this PR to get feedback on this approach, the chapters headings themselves, and to see if anyone wanted to help fill in the ones that aren't done yet.
Start of #42322.
/cc @rust-lang/dev-tools @rust-lang/docs
Pursuant to issue #25663, this commit adds the max and min functions to the Ord trait, enabling items that implement Ord to use UFCS (ex. 1.max(2)) instead of the longer std::cmp::max(1,2) format.
Add an in-place rotate method for slices to libcore
A helpful primitive for moving chunks of data around inside a slice.
For example, if you have a range selected and are drag-and-dropping it somewhere else (Example from [Sean Parent's talk](https://youtu.be/qH6sSOr-yk8?t=560)).
(If this should be an RFC instead of a PR, please let me know.)
Edit: changed example
