47 lines
1.3 KiB
Rust
47 lines
1.3 KiB
Rust
//! Calculation and management of a Strict Version Hash for crates
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//!
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//! The SVH is used for incremental compilation to track when HIR
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//! nodes have changed between compilations, and also to detect
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//! mismatches where we have two versions of the same crate that were
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//! compiled from distinct sources.
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use crate::fingerprint::Fingerprint;
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use std::fmt;
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use crate::stable_hasher;
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#[derive(Copy, Clone, PartialEq, Eq, Debug, Encodable, Decodable, Hash)]
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pub struct Svh {
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hash: Fingerprint,
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}
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impl Svh {
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/// Creates a new `Svh` given the hash. If you actually want to
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/// compute the SVH from some HIR, you want the `calculate_svh`
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/// function found in `rustc_incremental`.
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pub fn new(hash: Fingerprint) -> Svh {
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Svh { hash }
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}
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pub fn as_u128(self) -> u128 {
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self.hash.as_u128()
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}
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pub fn to_hex(self) -> String {
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format!("{:032x}", self.hash.as_u128())
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}
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}
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impl fmt::Display for Svh {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.pad(&self.to_hex())
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}
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}
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impl<T> stable_hasher::HashStable<T> for Svh {
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#[inline]
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fn hash_stable(&self, ctx: &mut T, hasher: &mut stable_hasher::StableHasher) {
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let Svh { hash } = *self;
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hash.hash_stable(ctx, hasher);
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}
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}
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