libcore: Add VaList and variadic arg handling intrinsics
## Summary
- Add intrinsics for `va_start`, `va_end`, `va_copy`, and `va_arg`.
- Add `core::va_list::VaList` to `libcore`.
Part 1 of (at least) 3 for #44930
Comments and critiques are very much welcomed 😄
Rollup of 22 pull requests
Successful merges:
- #55391 (bootstrap: clean up a few clippy findings)
- #56021 (avoid features_untracked)
- #56023 (atomic::Ordering: Get rid of misleading parts of intro)
- #56080 (Reduce the amount of bold text at doc.rlo)
- #56114 (Enclose type in backticks for "non-exhaustive patterns" error)
- #56124 (Fix small doc mistake on std::io::read::read_to_end)
- #56127 (Update an outdated comment in mir building)
- #56148 (Add rustc-guide as a submodule)
- #56149 (Make std::os::unix/linux::fs::MetadataExt::a/m/ctime* documentation clearer)
- #56220 (Suggest appropriate place for lifetime when declared after type arguments)
- #56223 (Make JSON output from -Zprofile-json valid)
- #56236 (Remove unsafe `unsafe` inner function.)
- #56255 (Update outdated code comments in StringReader)
- #56257 (rustc-guide has moved to rust-lang/)
- #56273 (Add missing doc link)
- #56289 (Fix small typo in comment of thread::stack_size)
- #56294 (Fix a typo in the documentation of std::ffi)
- #56312 (Deduplicate literal -> constant lowering)
- #56319 (fix futures creating aliasing mutable and shared ref)
- #56321 (rustdoc: add bottom margin spacing to nested lists)
- #56322 (resolve: Fix false-positives from lint `absolute_paths_not_starting_with_crate`)
- #56330 (Clean up span in non-trailing `..` suggestion)
Failed merges:
r? @ghost
fix futures creating aliasing mutable and shared ref
Fixes the problem described in https://github.com/solson/miri/issues/532#issuecomment-442552764: `set_task_waker` takes a shared reference and puts a copy into the TLS (in a `NonNull`), but `get_task_waker` gets it back out as a mutable reference. That violates "mutable references must not alias anything"!
Remove unsafe `unsafe` inner function.
Within this `Iterator` implementation, a function `unsafe_get` is
defined which unsafely allows _unchecked_ indexing of any element in a
slice. This should be marked as _unsafe_, but it is not.
To address this issue, I removed that inner function.
Make std::os::unix/linux::fs::MetadataExt::a/m/ctime* documentation clearer
I was confused by this API so I clarified what they are doing.
I was wondering if I should try to unify more documentation and examples between `unix` and `linux` (e.g. “of the file” is used in `unix` to refer to the file these metadata is for, “of this file” in `linux`, “of the underlying file” in `std::fs::File`).
Add rustc-guide as a submodule
Adding this as a submodule will allow two things:
- Linking to the guide from doc.rlo
- Doing a link check as part of the rust CI build
Key question: Do we want to wait for the book to be filled out more? e.g. do we ever want to move it out of the nursery?
r? @nikomatsakis
cc @steveklabnik
Fix small doc mistake on std::io::read::read_to_end
The std::io::read main documentation can lead to error because the buffer is prefilled with 10 zeros that will pad the response.
Using an empty vector is better.
The `read_to_end` documentation is already correct though.
This is my first rust PR, don't hesitate to tell me if I did something wrong.
atomic::Ordering: Get rid of misleading parts of intro
Remove the parts of atomic::Ordering's intro that wrongly claimed that
SeqCst prevents all reorderings around it.
Closes#55196
This is a (minimal) alternative to #55233.
I also wonder if it would be worth adding at least some warnings that atomics are often a footgun/hard to use correctly, similarly like `mem::transmute` or other functions have.
avoid features_untracked
The docs say to not use `features_untracked` when we have a tcx.
@oli-obk any particular reason why the untracked version is used all over const qualification?
bootstrap: clean up a few clippy findings
remove useless format!()s
remove redundant field names in a few struct initializations
pass slice instead of a vector to a function
use is_empty() instead of comparisons to .len()
No functional change intended.
Fix alignment of stores to scalar pair
The alignment for the second element of a scalar pair is not the same as for the first element, make sure it is calculated correctly. This fixes#56267.
r? @eddyb
set to zero meant that the nested list was squished up against
subsequent list items/paragraphs
this changes the bottom margin to .6em, same as for paragraphs
an example demonstrating the difference with screenshots is given in the
pull request
The alignment for the second element of a scalar pair is not the
same as for the first element. Make sure it is computed correctly
based on the element size.
submodules: update clippy from 754b4c07 to b2601beb
Changes:
````
Fix NAIVE_BYTECOUNT applicability
Fix dogfood error
Change Applicability of MISTYPED_LITERAL_SUFFIX
Add applicability level to (nearly) every span_lint_and_sugg function
Update stderr file
Fix bugs and improve documentation
Add Applicability::Unspecified to span_lint_and_sugg functions
Introduce snippet_with_applicability and hir_with_applicability functions
readme: tell how to install clippy on travis from git if it is not shipped with a nightly.
constants: add u128 i128 builtin types and fix outdated url
Update lints
Lint only the first statment/expression after alloc
Fix some warnings related to Self
Rename some symbols
Split lint into slow and unsafe vector initalization
Add unsafe set_len initialization
Add slow zero-filled vector initialization lint
Travis: Remove `sudo: false`
Downgrade needless_pass_by_value to allow by default
````
Changes:
````
Fix NAIVE_BYTECOUNT applicability
Fix dogfood error
Change Applicability of MISTYPED_LITERAL_SUFFIX
Add applicability level to (nearly) every span_lint_and_sugg function
Update stderr file
Fix bugs and improve documentation
Add Applicability::Unspecified to span_lint_and_sugg functions
Introduce snippet_with_applicability and hir_with_applicability functions
readme: tell how to install clippy on travis from git if it is not shipped with a nightly.
constants: add u128 i128 builtin types and fix outdated url
Update lints
Lint only the first statment/expression after alloc
Fix some warnings related to Self
Rename some symbols
Split lint into slow and unsafe vector initalization
Add unsafe set_len initialization
Add slow zero-filled vector initialization lint
Travis: Remove `sudo: false`
Downgrade needless_pass_by_value to allow by default
````
