| tag | 92cf0dbb293759d9cae186d32202d668e78d19b2 | |
|---|---|---|
| tagger | The Android Open Source Project <initial-contribution@android.com> | Tue Aug 06 22:40:27 2024 -0700 |
| object | fae6ca26cf70bbb5ac3d87ecfd8b0d40a60bee5d |
Android CTS 12.1 Release 11 (12178042)
| commit | fae6ca26cf70bbb5ac3d87ecfd8b0d40a60bee5d | [log] [tgz] |
|---|---|---|
| author | android-build-team Robot <android-build-team-robot@google.com> | Sat May 15 03:06:25 2021 +0000 |
| committer | android-build-team Robot <android-build-team-robot@google.com> | Sat May 15 03:06:25 2021 +0000 |
| tree | a7d702e71f38ae1597839c01ccca8820999c02e9 | |
| parent | c3e38f91f71baebb22aca2fcfd69b61561dd7309 [diff] | |
| parent | b76b73431a14eb8a763eb4a305103ac25721cee0 [diff] |
Snap for 7362794 from b76b73431a14eb8a763eb4a305103ac25721cee0 to sc-v2-release Change-Id: Ia2c230386df24b471fe075b03c5a5078f281da15
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(ptr_offset_from, const_ptr_offset_from, const_maybe_uninit_as_ptr, const_raw_ptr_deref)]
If you intend to use offset_of! inside a const fn, also add the const_fn compiler feature.