bjoernager/rust
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Make the randomize feature of rustc_abi additive

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This commit is contained in:
hkalbasi 2023-11-05 21:51:47 +03:30
parent a42d94ebb8
commit c8a25eddfe
4 changed files with 7 additions and 9 deletions
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5
compiler/rustc_abi/src/layout.rs
View file

@ -906,9 +906,8 @@ fn univariant<
use rand::{seq::SliceRandom, SeedableRng};
// `ReprOptions.layout_seed` is a deterministic seed we can use to randomize field
// ordering.
let mut rng = rand_xoshiro::Xoshiro128StarStar::seed_from_u64(
repr.field_shuffle_seed.as_u64(),
);
let mut rng =
rand_xoshiro::Xoshiro128StarStar::seed_from_u64(repr.field_shuffle_seed);
// Shuffle the ordering of the fields.
optimizing.shuffle(&mut rng);

5
compiler/rustc_abi/src/lib.rs
View file

@ -76,15 +76,14 @@ pub struct ReprOptions {
pub align: Option<Align>,
pub pack: Option<Align>,
pub flags: ReprFlags,
#[cfg(feature = "randomize")]
/// The seed to be used for randomizing a type's layout
///
/// Note: This could technically be a `Hash128` which would
/// Note: This could technically be a `u128` which would
/// be the "most accurate" hash as it'd encompass the item and crate
/// hash without loss, but it does pay the price of being larger.
/// Everything's a tradeoff, a 64-bit seed should be sufficient for our
/// purposes (primarily `-Z randomize-layout`)
pub field_shuffle_seed: rustc_data_structures::stable_hasher::Hash64,
pub field_shuffle_seed: u64,
}
impl ReprOptions {