73 lines
1.9 KiB
Rust
73 lines
1.9 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! 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 std::fmt;
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use std::hash::{Hash, Hasher};
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use serialize::{Encodable, Decodable, Encoder, Decoder};
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#[derive(Copy, Clone, PartialEq, Eq, Debug)]
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pub struct Svh {
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hash: u64,
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}
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impl Svh {
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/// Create 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 `librustc_incremental`.
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pub fn new(hash: u64) -> Svh {
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Svh { hash: hash }
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}
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pub fn as_u64(&self) -> u64 {
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self.hash
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}
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pub fn to_string(&self) -> String {
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format!("{:016x}", self.hash)
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}
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}
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impl Hash for Svh {
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fn hash<H>(&self, state: &mut H) where H: Hasher {
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self.hash.to_le().hash(state);
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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_string())
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}
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}
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impl Encodable for Svh {
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fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
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s.emit_u64(self.as_u64().to_le())
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}
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}
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impl Decodable for Svh {
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fn decode<D: Decoder>(d: &mut D) -> Result<Svh, D::Error> {
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d.read_u64()
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.map(u64::from_le)
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.map(Svh::new)
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}
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}
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impl_stable_hash_for!(struct Svh {
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hash
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});
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