tag | 3e9b7fe4be5adbe86dfcb62fe40be091d3730a5e | |
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tagger | The Android Open Source Project <initial-contribution@android.com> | Wed Jan 12 10:36:39 2022 -0800 |
object | 52378f7d3c30d52d4519e4e3c9abf9fbd0afe985 |
Android S v2 Preview 2 (S2B2.211203.006)
commit | 52378f7d3c30d52d4519e4e3c9abf9fbd0afe985 | [log] [tgz] |
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author | Joel Galenson <jgalenson@google.com> | Tue Aug 24 18:24:03 2021 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Tue Aug 24 18:24:03 2021 +0000 |
tree | aa92a514c5571fc3ae19b8e72d0f837897298b6e | |
parent | 50e03f477032b904fb5f5e33f6a7e72aaa210233 [diff] | |
parent | 06ca3ea500ed863624da32752bf0a4d14b9270f4 [diff] |
Update TEST_MAPPING am: 06ca3ea500 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/memoffset/+/1804903 Change-Id: Ie3b69eaf19f7579f3e69e5b1fa636d44265dcfd7
C-Like offset_of
functionality for Rust structs.
Introduces the following macros:
offset_of!
for obtaining the offset of a member of a struct.offset_of_tuple!
for obtaining the offset of a member of a tuple. (Requires Rust 1.20+)span_of!
for obtaining the range that a field, or fields, span.memoffset
works under no_std
environments.
Add the following dependency to your Cargo.toml
:
[dependencies] memoffset = "0.6"
These versions will compile fine with rustc versions greater or equal to 1.19.
Add the following lines at the top of your main.rs
or lib.rs
files.
#[macro_use] extern crate memoffset;
#[macro_use] extern crate memoffset; #[repr(C, packed)] struct Foo { a: u32, b: u32, c: [u8; 5], d: u32, } fn main() { assert_eq!(offset_of!(Foo, b), 4); assert_eq!(offset_of!(Foo, d), 4+4+5); assert_eq!(span_of!(Foo, a), 0..4); assert_eq!(span_of!(Foo, a .. c), 0..8); assert_eq!(span_of!(Foo, a ..= c), 0..13); assert_eq!(span_of!(Foo, ..= d), 0..17); assert_eq!(span_of!(Foo, b ..), 4..17); }
memoffset
has experimental support for compile-time offset_of!
on a nightly compiler.
In order to use it, you must enable the unstable_const
crate feature and several compiler features.
Cargo.toml:
[dependencies.memoffset] version = "0.6" features = ["unstable_const"]
Your crate root: (lib.rs
/main.rs
)
#![feature(const_ptr_offset_from, const_maybe_uninit_as_ptr, const_raw_ptr_deref, const_refs_to_cell)]