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Extend -Cdebuginfo with new options and named aliases #109808

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merged 3 commits into from
Apr 4, 2023

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@jyn514 jyn514 commented Mar 31, 2023

This is a rebase of #83947, along with my best guess at what the new options mean. I tried to follow the LLVM source code to get a better idea but ran into quite a lot of trouble (https://rust-lang.zulipchat.com/#narrow/stream/187780-t-compiler.2Fwg-llvm/topic/go-to-definition.20in.20src.2Fllvm-project.3F). The description for the original PR follows below.

Note that the changes in this PR have already been through FCP: #83947 (comment)

Closes #109311. Helps with #104968.
r? @michaelwoerister cc @cuviper


The -Cdebuginfo=1 option was never line tables only and can't be due to backwards compatibility issues. This was clarified and an option for emitting line tables only was added. Additionally an option for emitting line info directives only was added, which is needed for some targets, i.e. nvptx. The debug info options should now behave similarly to clang's debug info options.

Fix #60020
Fix #64405

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Mar 31, 2023
@jyn514 jyn514 changed the title Extend -Cdebuginfo with new options and named aliases #83947 Extend -Cdebuginfo with new options and named aliases Mar 31, 2023
* `1`: line tables only.
* `2`: full debug info.
* `0` or `none`: no debug info at all (the default).
* `line-directives-only`: line info directives only. For the nvptx* targets this enables [profiling](https://reviews.llvm.org/D46061). On other targets this behaves the same as `none`.
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@jdtatz do you know if this second sentence here is correct?

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@michaelwoerister michaelwoerister Apr 4, 2023

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This does not seem to be true. Looking at the output of objdump --section-header and objdump -W, there are a few differences between none, line-directives-only, and line-tables-only:

  • none is the smallest and contains no debuginfo related sections
  • line-directives-only contains the .debug_line section and (an empty) .debug_aranges.
  • line-tables-only adds .debug_abbrev, .debug_info, .debug_str, and a proper .debug_aranges section.

So line-directives-only is a reduced (degraded?) version of line-tables-only. I could imagine that for most tools line-directives-only is effectively the same as none.

In terms of documentation, my suggestion would be

* `line-directives-only`: line info directives only; a stripped down version of `line-tables-only`. 
  For the nvptx* targets this enables [profiling](https://reviews.llvm.org/D46061). 
  For other use cases, `line-tables-only` is the better, more compatible choice.

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This is amazing, thank you so much ❤️ I didn't even think about using objdump.

@jyn514 jyn514 added A-debuginfo Area: Debugging information in compiled programs (DWARF, PDB, etc.) finished-final-comment-period The final comment period is finished for this PR / Issue. labels Mar 31, 2023
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Thanks, @jyn514! I'll take a closer look early next week.

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jdtatz added 2 commits March 31, 2023 07:28
`-Cdebuginfo=1` was never line tables only and
can't be due to backwards compatibility issues.
This was clarified and an option for line tables only
was added. Additionally an option for line info
directives only was added, which is well needed for
some targets. The debug info options should now
behave the same as clang's debug info options.
@jyn514 jyn514 force-pushed the debuginfo-options branch from d5c9c0b to 9648677 Compare March 31, 2023 11:28
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cuviper commented Apr 2, 2023

@rust-lang/cargo may also want to think about exposing this in Cargo.toml.

@rustbot rustbot added A-testsuite Area: The testsuite used to check the correctness of rustc T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue. labels Apr 2, 2023
@jyn514 jyn514 force-pushed the debuginfo-options branch from 32498ee to 9648677 Compare April 2, 2023 21:04
@michaelwoerister michaelwoerister added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Apr 4, 2023
@jyn514 jyn514 force-pushed the debuginfo-options branch from 9648677 to 92b7591 Compare April 4, 2023 11:38
@jyn514 jyn514 added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Apr 4, 2023
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@bors r+

Thanks for pushing this over the finish line, @jyn514!
And thanks for the original implementation, @jdtatz!

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bors commented Apr 4, 2023

📌 Commit 92b7591 has been approved by michaelwoerister

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Apr 4, 2023
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bors commented Apr 4, 2023

⌛ Testing commit 92b7591 with merge 700938c...

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bors commented Apr 4, 2023

☀️ Test successful - checks-actions
Approved by: michaelwoerister
Pushing 700938c to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Apr 4, 2023
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Finished benchmarking commit (700938c): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-0.2% [-0.3%, -0.2%] 5
All ❌✅ (primary) - - 0

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-2.2% [-2.2%, -2.2%] 1
Improvements ✅
(secondary)
-1.5% [-2.7%, -1.0%] 4
All ❌✅ (primary) -2.2% [-2.2%, -2.2%] 1

Cycles

This benchmark run did not return any relevant results for this metric.

@jyn514 jyn514 deleted the debuginfo-options branch April 5, 2023 00:05
jyn514 added a commit to jyn514/cargo that referenced this pull request Apr 11, 2023
Rustc supports these since rust-lang/rust#109808. It's technically
possible to set a named debuginfo level through `RUSTFLAGS`, but in
practice cargo always passes its own opinion of what the debuginfo level
is, so allow it to be configured through cargo too.
jyn514 added a commit to jyn514/cargo that referenced this pull request Apr 11, 2023
Rustc supports these since rust-lang/rust#109808. It's technically
possible to set a named debuginfo level through `RUSTFLAGS`, but in
practice cargo always passes its own opinion of what the debuginfo level
is, so allow it to be configured through cargo too.
charles-r-earp pushed a commit to charles-r-earp/cargo that referenced this pull request May 3, 2023
Rustc supports these since rust-lang/rust#109808. It's technically
possible to set a named debuginfo level through `RUSTFLAGS`, but in
practice cargo always passes its own opinion of what the debuginfo level
is, so allow it to be configured through cargo too.
wip-sync pushed a commit to NetBSD/pkgsrc-wip that referenced this pull request Jun 3, 2023
Pkgsrc changes:
 * Adjust patches and cargo checksums to new versions.
 * Adjust to not cross-build to 8.0, due to LLVM using c++17,
   so adjust USE_LANGUAGES.

Upstream changes:

Version 1.70.0 (2023-06-01)
==========================

Language
--------
- [Relax ordering rules for `asm!` operands]
  (rust-lang/rust#105798)
- [Properly allow macro expanded `format_args` invocations to uses
  captures] (rust-lang/rust#106505)
- [Lint ambiguous glob re-exports]
  (rust-lang/rust#107880)
- [Perform const and unsafe checking for expressions in `let _ =
  expr` position.]
  (rust-lang/rust#102256)

Compiler
--------
- [Extend -Cdebuginfo with new options and named aliases]
  (rust-lang/rust#109808)
  This provides a smaller version of debuginfo for cases that only
  need line number information (`-Cdebuginfo=line-tables-only`),
  which may eventually become the default for `-Cdebuginfo=1`.
- [Make `unused_allocation` lint against `Box::new` too]
  (rust-lang/rust#104363)
- [Detect uninhabited types early in const eval]
  (rust-lang/rust#109435)
- [Switch to LLD as default linker for {arm,thumb}v4t-none-eabi]
  (rust-lang/rust#109721)
- [Add tier 3 target `loongarch64-unknown-linux-gnu`]
  (rust-lang/rust#96971)
- [Add tier 3 target for `i586-pc-nto-qnx700` (QNX Neutrino RTOS,
  version 7.0)] (rust-lang/rust#109173),
- [Insert alignment checks for pointer dereferences as debug assertions]
  (rust-lang/rust#98112)
  This catches undefined behavior at runtime, and may cause existing
  code to fail.

Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.

Libraries
---------
- [Document NonZeroXxx layout guarantees]
  (rust-lang/rust#94786)
- [Windows: make `Command` prefer non-verbatim paths]
  (rust-lang/rust#96391)
- [Implement Default for some alloc/core iterators]
  (rust-lang/rust#99929)
- [Fix handling of trailing bare CR in str::lines]
  (rust-lang/rust#100311)
- [allow negative numeric literals in `concat!`]
  (rust-lang/rust#106844)
- [Add documentation about the memory layout of `Cell`]
  (rust-lang/rust#106921)
- [Use `partial_cmp` to implement tuple `lt`/`le`/`ge`/`gt`]
  (rust-lang/rust#108157)
- [Stabilize `atomic_as_ptr`]
  (rust-lang/rust#108419)
- [Stabilize `nonnull_slice_from_raw_parts`]
  (rust-lang/rust#97506)
- [Partial stabilization of `once_cell`]
  (rust-lang/rust#105587)
- [Stabilize `nonzero_min_max`]
  (rust-lang/rust#106633)
- [Flatten/inline format_args!() and (string and int) literal
  arguments into format_args!()]
  (rust-lang/rust#106824)
- [Stabilize movbe target feature]
  (rust-lang/rust#107711)
- [don't splice from files into pipes in io::copy]
  (rust-lang/rust#108283)
- [Add a builtin unstable `FnPtr` trait that is implemented for
  all function pointers]
  (rust-lang/rust#108080)
  This extends `Debug`, `Pointer`, `Hash`, `PartialEq`, `Eq`,
  `PartialOrd`, and `Ord` implementations for function pointers
  with all ABIs.

Stabilized APIs
---------------

- [`NonZero*::MIN/MAX`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroI8.html#associatedconstant.MIN)
- [`BinaryHeap::retain`]
  (https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.retain)
- [`Default for std::collections::binary_heap::IntoIter`]
  (https://doc.rust-lang.org/stable/std/collections/binary_heap/struct.IntoIter.html)
- [`Default for std::collections::btree_map::{IntoIter, Iter, IterMut}`]
  (https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoIter.html)
- [`Default for std::collections::btree_map::{IntoKeys, Keys}`]
  (https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoKeys.html)
- [`Default for std::collections::btree_map::{IntoValues, Values}`]
  (https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoKeys.html)
- [`Default for std::collections::btree_map::Range`]
  (https://doc.rust-lang.org/stable/std/collections/btree_map/struct.Range.html)
- [`Default for std::collections::btree_set::{IntoIter, Iter}`]
  (https://doc.rust-lang.org/stable/std/collections/btree_set/struct.IntoIter.html)
- [`Default for std::collections::btree_set::Range`]
  (https://doc.rust-lang.org/stable/std/collections/btree_set/struct.Range.html)
- [`Default for std::collections::linked_list::{IntoIter, Iter, IterMut}`]
  (https://doc.rust-lang.org/stable/alloc/collections/linked_list/struct.IntoIter.html)
- [`Default for std::vec::IntoIter`]
  (https://doc.rust-lang.org/stable/alloc/vec/struct.IntoIter.html#impl-Default-for-IntoIter%3CT,+A%3E)
- [`Default for std::iter::Chain`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Chain.html)
- [`Default for std::iter::Cloned`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Cloned.html)
- [`Default for std::iter::Copied`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Copied.html)
- [`Default for std::iter::Enumerate`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Enumerate.html)
- [`Default for std::iter::Flatten`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Flatten.html)
- [`Default for std::iter::Fuse`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Fuse.html)
- [`Default for std::iter::Rev`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Rev.html)
- [`Default for std::slice::Iter`]
  (https://doc.rust-lang.org/stable/std/slice/struct.Iter.html)
- [`Default for std::slice::IterMut`]
  (https://doc.rust-lang.org/stable/std/slice/struct.IterMut.html)
- [`Rc::into_inner`]
  (https://doc.rust-lang.org/stable/alloc/rc/struct.Rc.html#method.into_inner)
- [`Arc::into_inner`]
  (https://doc.rust-lang.org/stable/alloc/sync/struct.Arc.html#method.into_inner)
- [`std::cell::OnceCell`]
  (https://doc.rust-lang.org/stable/std/cell/struct.OnceCell.html)
- [`Option::is_some_and`]
  (https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.is_some_and)
- [`NonNull::slice_from_raw_parts`]
  (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.slice_from_raw_parts)
- [`Result::is_ok_and`]
  (https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.is_ok_and)
- [`Result::is_err_and`]
  (https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.is_err_and)
- [`std::sync::atomic::Atomic*::as_ptr`]
  (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicU8.html#method.as_ptr)
- [`std::io::IsTerminal`]
  (https://doc.rust-lang.org/stable/std/io/trait.IsTerminal.html)
- [`std::os::linux::net::SocketAddrExt`]
  (https://doc.rust-lang.org/stable/std/os/linux/net/trait.SocketAddrExt.html)
- [`std::os::unix::net::UnixDatagram::bind_addr`]
  (https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.bind_addr)
- [`std::os::unix::net::UnixDatagram::connect_addr`]
  (https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.connect_addr)
- [`std::os::unix::net::UnixDatagram::send_to_addr`]
  (https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.send_to_addr)
- [`std::os::unix::net::UnixListener::bind_addr`]
  (https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixListener.html#method.bind_addr)
- [`std::path::Path::as_mut_os_str`]
  (https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.as_mut_os_str)
- [`std::sync::OnceLock`]
  (https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html)

Cargo
-----

- [Add `CARGO_PKG_README`]
  (rust-lang/cargo#11645)
- [Make `sparse` the default protocol for crates.io]
  (rust-lang/cargo#11791)
- [Accurately show status when downgrading dependencies]
  (rust-lang/cargo#11839)
- [Use registry.default for login/logout]
  (rust-lang/cargo#11949)
- [Stabilize `cargo logout`]
  (rust-lang/cargo#11950)

Misc
----

- [Stabilize rustdoc `--test-run-directory`]
  (rust-lang/rust#103682)

Compatibility Notes
-------------------

- [Prevent stable `libtest` from supporting `-Zunstable-options`]
  (rust-lang/rust#109044)
- [Perform const and unsafe checking for expressions in `let _ =
  expr` position.] (rust-lang/rust#102256)
- [WebAssembly targets enable `sign-ext` and `mutable-globals`
  features in codegen] (rust-lang/rust#109807)
  This may cause incompatibility with older execution environments.
- [Insert alignment checks for pointer dereferences as debug assertions]
  (rust-lang/rust#98112)
  This catches undefined behavior at runtime, and may cause existing
  code to fail.

Internal Changes
----------------

These changes do not affect any public interfaces of Rust, but they represent
significant improvements to the performance or internals of rustc and related
tools.

- [Upgrade to LLVM 16]
  (rust-lang/rust#109474)
- [Use SipHash-1-3 instead of SipHash-2-4 for StableHasher]
  (rust-lang/rust#107925)
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Jul 10, 2023
Pkgsrc changes:
 * Adjust patches and cargo checksums to new versions.
 * Add support for NetBSD/riscv64.

Upstream changes:

Version 1.70.0 (2023-06-01)
==========================

Language
--------
- [Relax ordering rules for `asm!` operands]
  (rust-lang/rust#105798)
- [Properly allow macro expanded `format_args` invocations to uses captures]
  (rust-lang/rust#106505)
- [Lint ambiguous glob re-exports]
  (rust-lang/rust#107880)
- [Perform const and unsafe checking for expressions in `let _ =
  expr` position.]
  (rust-lang/rust#102256)

Compiler
--------
- [Extend -Cdebuginfo with new options and named aliases]
  (rust-lang/rust#109808)
  This provides a smaller version of debuginfo for cases that only
  need line number information (`-Cdebuginfo=line-tables-only`),
  which may eventually become the default for `-Cdebuginfo=1`.
- [Make `unused_allocation` lint against `Box::new` too]
  (rust-lang/rust#104363)
- [Detect uninhabited types early in const eval]
  (rust-lang/rust#109435)
- [Switch to LLD as default linker for {arm,thumb}v4t-none-eabi]
  (rust-lang/rust#109721)
- [Add tier 3 target `loongarch64-unknown-linux-gnu`]
  (rust-lang/rust#96971)
- [Add tier 3 target for `i586-pc-nto-qnx700`(QNX Neutrino RTOS, version 7.0)]
  (rust-lang/rust#109173),
- [Insert alignment checks for pointer dereferences as debug assertions]
  (rust-lang/rust#98112)
  This catches undefined behavior at runtime, and may cause existing
  code to fail.

Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.

Libraries
---------
- [Document NonZeroXxx layout guarantees]
  (rust-lang/rust#94786)
- [Windows: make `Command` prefer non-verbatim paths]
  (rust-lang/rust#96391)
- [Implement Default for some alloc/core iterators]
  (rust-lang/rust#99929)
- [Fix handling of trailing bare CR in str::lines]
  (rust-lang/rust#100311)
- [allow negative numeric literals in `concat!`]
  (rust-lang/rust#106844)
- [Add documentation about the memory layout of `Cell`]
  (rust-lang/rust#106921)
- [Use `partial_cmp` to implement tuple `lt`/`le`/`ge`/`gt`]
  (rust-lang/rust#108157)
- [Stabilize `atomic_as_ptr`]
  (rust-lang/rust#108419)
- [Stabilize `nonnull_slice_from_raw_parts`]
  (rust-lang/rust#97506)
- [Partial stabilization of `once_cell`]
  (rust-lang/rust#105587)
- [Stabilize `nonzero_min_max`]
  (rust-lang/rust#106633)
- [Flatten/inline format_args!() and (string and int) literal
  arguments into format_args!()]
  (rust-lang/rust#106824)
- [Stabilize movbe target feature]
  (rust-lang/rust#107711)
- [don't splice from files into pipes in io::copy]
  (rust-lang/rust#108283)
- [Add a builtin unstable `FnPtr` trait that is implemented for
  all function pointers]
  (rust-lang/rust#108080)
  This extends `Debug`, `Pointer`, `Hash`, `PartialEq`, `Eq`,
  `PartialOrd`, and `Ord` implementations for function pointers
  with all ABIs.


Stabilized APIs
---------------

- [`NonZero*::MIN/MAX`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroI8.html#associatedconstant.MIN)
- [`BinaryHeap::retain`]
  (https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.retain)
- [`Default for std::collections::binary_heap::IntoIter`]
  (https://doc.rust-lang.org/stable/std/collections/binary_heap/struct.IntoIter.html)
- [`Default for std::collections::btree_map::{IntoIter, Iter, IterMut}`]
  (https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoIter.html)
- [`Default for std::collections::btree_map::{IntoKeys, Keys}`]
  (https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoKeys.html)
- [`Default for std::collections::btree_map::{IntoValues, Values}`]
  (https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoKeys.html)
- [`Default for std::collections::btree_map::Range`]
  (https://doc.rust-lang.org/stable/std/collections/btree_map/struct.Range.html)
- [`Default for std::collections::btree_set::{IntoIter, Iter}`]
  (https://doc.rust-lang.org/stable/std/collections/btree_set/struct.IntoIter.html)
- [`Default for std::collections::btree_set::Range`]
  (https://doc.rust-lang.org/stable/std/collections/btree_set/struct.Range.html)
- [`Default for std::collections::linked_list::{IntoIter, Iter, IterMut}`]
  (https://doc.rust-lang.org/stable/alloc/collections/linked_list/struct.IntoIter.html)
- [`Default for std::vec::IntoIter`]
  (https://doc.rust-lang.org/stable/alloc/vec/struct.IntoIter.html#impl-Default-for-IntoIter%3CT,+A%3E)
- [`Default for std::iter::Chain`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Chain.html)
- [`Default for std::iter::Cloned`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Cloned.html)
- [`Default for std::iter::Copied`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Copied.html)
- [`Default for std::iter::Enumerate`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Enumerate.html)
- [`Default for std::iter::Flatten`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Flatten.html)
- [`Default for std::iter::Fuse`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Fuse.html)
- [`Default for std::iter::Rev`]
  (https://doc.rust-lang.org/stable/std/iter/struct.Rev.html)
- [`Default for std::slice::Iter`]
  (https://doc.rust-lang.org/stable/std/slice/struct.Iter.html)
- [`Default for std::slice::IterMut`]
  (https://doc.rust-lang.org/stable/std/slice/struct.IterMut.html)
- [`Rc::into_inner`]
  (https://doc.rust-lang.org/stable/alloc/rc/struct.Rc.html#method.into_inner)
- [`Arc::into_inner`]
  (https://doc.rust-lang.org/stable/alloc/sync/struct.Arc.html#method.into_inner)
- [`std::cell::OnceCell`]
  (https://doc.rust-lang.org/stable/std/cell/struct.OnceCell.html)
- [`Option::is_some_and`]
  (https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.is_some_and)
- [`NonNull::slice_from_raw_parts`]
  (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.slice_from_raw_parts)
- [`Result::is_ok_and`]
  (https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.is_ok_and)
- [`Result::is_err_and`]
  (https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.is_err_and)
- [`std::sync::atomic::Atomic*::as_ptr`]
  (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicU8.html#method.as_ptr)
- [`std::io::IsTerminal`]
  (https://doc.rust-lang.org/stable/std/io/trait.IsTerminal.html)
- [`std::os::linux::net::SocketAddrExt`]
  (https://doc.rust-lang.org/stable/std/os/linux/net/trait.SocketAddrExt.html)
- [`std::os::unix::net::UnixDatagram::bind_addr`]
  (https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.bind_addr)
- [`std::os::unix::net::UnixDatagram::connect_addr`]
  (https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.connect_addr)
- [`std::os::unix::net::UnixDatagram::send_to_addr`]
  (https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.send_to_addr)
- [`std::os::unix::net::UnixListener::bind_addr`]
  (https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixListener.html#method.bind_addr)
- [`std::path::Path::as_mut_os_str`]
  (https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.as_mut_os_str)
- [`std::sync::OnceLock`]
  (https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html)

Cargo
-----

- [Add `CARGO_PKG_README`]
  (rust-lang/cargo#11645)
- [Make `sparse` the default protocol for crates.io]
  (rust-lang/cargo#11791)
- [Accurately show status when downgrading dependencies]
  (rust-lang/cargo#11839)
- [Use registry.default for login/logout]
  (rust-lang/cargo#11949)
- [Stabilize `cargo logout`]
  (rust-lang/cargo#11950)

Misc
----

- [Stabilize rustdoc `--test-run-directory`]
  (rust-lang/rust#103682)

Compatibility Notes
-------------------

- [Prevent stable `libtest` from supporting `-Zunstable-options`]
  (rust-lang/rust#109044)
- [Perform const and unsafe checking for expressions in `let _ =
  expr` position.]
  (rust-lang/rust#102256)
- [WebAssembly targets enable `sign-ext` and `mutable-globals`
  features in codegen]
  (rust-lang/rust#109807)
  This may cause incompatibility with older execution environments.
- [Insert alignment checks for pointer dereferences as debug assertions]
  (rust-lang/rust#98112)
  This catches undefined behavior at runtime, and may cause existing
  code to fail.

Internal Changes
----------------

These changes do not affect any public interfaces of Rust, but they represent
significant improvements to the performance or internals of rustc and related
tools.

- [Upgrade to LLVM 16]
  (rust-lang/rust#109474)
- [Use SipHash-1-3 instead of SipHash-2-4 for StableHasher]
  (rust-lang/rust#107925)
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