bjoernager/rust
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Add StableOrd trait as proposed in MCP 533.

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The StableOrd trait can be used to mark types as having a stable
sort order across compilation sessions. Collections that sort their
items in a stable way can safely implement HashStable by
hashing items in sort order.
This commit is contained in:
Michael Woerister 2022-12-02 15:14:49 +01:00
parent 11663b1b48
commit 3a58309798
7 changed files with 96 additions and 36 deletions
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5
compiler/rustc_session/src/config.rs
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@ -10,7 +10,7 @@ use crate::{lint, HashStableContext};
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::stable_hasher::ToStableHashKey;
use rustc_data_structures::stable_hasher::{StableOrd, ToStableHashKey};
use rustc_target::abi::Align;
use rustc_target::spec::{PanicStrategy, SanitizerSet, SplitDebuginfo};
use rustc_target::spec::{Target, TargetTriple, TargetWarnings, TARGETS};
@ -288,6 +288,9 @@ pub enum OutputType {
DepInfo,
}
// Safety: Trivial C-Style enums have a stable sort order across compilation sessions.
unsafe impl StableOrd for OutputType {}
impl<HCX: HashStableContext> ToStableHashKey<HCX> for OutputType {
type KeyType = Self;