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Elaborate on ip_addr bit conversion endianness #118505

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merged 1 commit into from
Dec 8, 2023

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CLEckhardt
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Adds explanation of how endianness is handled when converting Ipv4Addr and Ipv6Addr to and from bits. This is intended to unblock stabilization of the affected methods.

Addresses #113744

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rustbot commented Dec 1, 2023

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @cuviper (or someone else) soon.

Please see the contribution instructions for more information. Namely, in order to ensure the minimum review times lag, PR authors and assigned reviewers should ensure that the review label (S-waiting-on-review and S-waiting-on-author) stays updated, invoking these commands when appropriate:

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Dec 1, 2023
/// Although IPv4 addresses are big-endian, the `u32` value will use the target platform's
/// native byte order. That is, the `u32` value is an integer representation of the IPv4
/// address and not an integer interpretation of the IPv4 address's big-endian bitstring. This
/// means that the `u32` value `&` with `0xffffff00` will set the last octet in the address to
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Using the & operator as a verb seems confusing to me -- maybe we can leave that to the example and use "masked" here?

Suggested change
/// means that the `u32` value `&` with `0xffffff00` will set the last octet in the address to
/// means that the `u32` value masked with `0xffffff00` will set the last octet in the address to

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That sounds a lot better, thanks. Update pushed.

/// Although IPv6 addresses are big-endian, the `u128` value will use the target platform's
/// native byte order. That is, the `u128` value is an integer representation of the IPv6
/// address and not an integer interpretation of the IPv6 address's big-endian bitstring. This
/// means that the `u128` value `&` with `0xffffffffffffffffffffffffffff0000_u128` will set the
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Same confusion and suggestion as above.

Suggested change
/// means that the `u128` value `&` with `0xffffffffffffffffffffffffffff0000_u128` will set the
/// means that the `u128` value masked with `0xffffffffffffffffffffffffffff0000_u128` will set the

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Update pushed.

Adds explanation of how endianness is handled when converting `Ipv4Addr`
and `Ipv6Addr` to and from bits.

Addresses rust-lang#113744
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The job x86_64-gnu-llvm-16 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)
GITHUB_ACTION=__run_7
GITHUB_ACTIONS=true
GITHUB_ACTION_REF=
GITHUB_ACTION_REPOSITORY=
GITHUB_ACTOR=CLEckhardt
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GITHUB_REF=refs/pull/118505/merge
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GITHUB_REF_PROTECTED=false
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GITHUB_SERVER_URL=https://github.com
GITHUB_SHA=e1d61fd2d037a6d8a7937f7d4c141a2c7007e558
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GITHUB_WORKSPACE=/home/runner/work/rust/rust
GOROOT_1_19_X64=/opt/hostedtoolcache/go/1.19.13/x64
---
Built container sha256:9c3c93a371e5aed5c18185b24f130d95d5140dbd72a9b325e7b6b49e521a4faa
Looks like docker image is the same as before, not uploading
https://ci-caches.rust-lang.org/docker/7ebc15c01a233894034d277c8cce4e949f4e7791f66b4727c8fb6e058a0b8171d6152e1441d677cef0653843ceeee469c097b8699b2bb74249e674f6aa1a8813
sha256:9c3c93a371e5aed5c18185b24f130d95d5140dbd72a9b325e7b6b49e521a4faa
Setting extra environment values for docker:  --env ENABLE_GCC_CODEGEN=1 --env GCC_EXEC_PREFIX=/usr/lib/gcc/
[CI_JOB_NAME=x86_64-gnu-llvm-16]
##[group]Clock drift check
  local time: Thu Dec  7 15:18:44 UTC 2023
  network time: Thu, 07 Dec 2023 15:18:45 GMT
  network time: Thu, 07 Dec 2023 15:18:45 GMT
##[endgroup]
sccache: Starting the server...
##[group]Configure the build
configure: processing command line
configure: 
configure: build.configure-args := ['--build=x86_64-unknown-linux-gnu', '--llvm-root=/usr/lib/llvm-16', '--enable-llvm-link-shared', '--set', 'rust.thin-lto-import-instr-limit=10', '--enable-verbose-configure', '--enable-sccache', '--disable-manage-submodules', '--enable-locked-deps', '--enable-cargo-native-static', '--set', 'rust.codegen-units-std=1', '--set', 'dist.compression-profile=balanced', '--dist-compression-formats=xz', '--disable-dist-src', '--release-channel=nightly', '--enable-debug-assertions', '--enable-overflow-checks', '--enable-llvm-assertions', '--set', 'rust.verify-llvm-ir', '--set', 'rust.codegen-backends=llvm,cranelift,gcc', '--set', 'llvm.static-libstdcpp', '--enable-missing-tools', '--enable-new-symbol-mangling']
configure: target.x86_64-unknown-linux-gnu.llvm-config := /usr/lib/llvm-16/bin/llvm-config
configure: llvm.link-shared     := True
configure: rust.thin-lto-import-instr-limit := 10
configure: rust.codegen-units-std := 1
---
   Compiling bitflags v2.4.0
   Compiling linux-raw-sys v0.4.5
   Compiling fastrand v2.0.0
   Compiling smallvec v1.10.0
error: invalid `--check-cfg` argument: `values(freebsd10)` (expected `cfg(name, values("value1", "value2", ... "valueN"))`)
error: could not compile `libc` (lib) due to previous error
warning: build failed, waiting for other jobs to finish...
Build completed unsuccessfully in 0:10:37
  local time: Thu Dec  7 15:29:56 UTC 2023

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cuviper commented Dec 8, 2023

Looks good!

@bors r+ rollup

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bors commented Dec 8, 2023

📌 Commit c3bb1b5 has been approved by cuviper

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 Dec 8, 2023
bors added a commit to rust-lang-ci/rust that referenced this pull request Dec 8, 2023
…iaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#118505 (Elaborate on ip_addr bit conversion endianness)
 - rust-lang#118581 (OnceLock: Add note about drop and statics)
 - rust-lang#118677 ([rustdoc] Fix display of features)
 - rust-lang#118690 (coverage: Avoid unnecessary macros in unit tests)
 - rust-lang#118693 (Tell MirUsedCollector that the pointer alignment checks calls its panic symbol)
 - rust-lang#118695 (coverage: Merge refined spans in a separate final pass)
 - rust-lang#118709 (fix jobserver GLOBAL_CLIENT_CHECKED uninitialized before use)
 - rust-lang#118722 (rustdoc: remove unused parameter `reversed` from onEach(Lazy))

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 992f7ee into rust-lang:master Dec 8, 2023
8 of 11 checks passed
@rustbot rustbot added this to the 1.76.0 milestone Dec 8, 2023
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Dec 8, 2023
Rollup merge of rust-lang#118505 - CLEckhardt:update_ip_addr_bits_docs, r=cuviper

Elaborate on ip_addr bit conversion endianness

Adds explanation of how endianness is handled when converting `Ipv4Addr` and `Ipv6Addr` to and from bits. This is intended to unblock stabilization of the affected methods.

Addresses rust-lang#113744
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5 participants