compiler/rustc_span/src/crate_disambiguator.rs

   1 // This is here because `rustc_session` wants to refer to it,
   2 // and so does `rustc_hir`, but `rustc_hir` shouldn't refer to `rustc_session`.
   3
   4 use rustc_data_structures::fingerprint::Fingerprint;
   5 use rustc_data_structures::{base_n, impl_stable_hash_via_hash};
   6
   7 use std::fmt;
   8
   9 /// Hash value constructed out of all the `-C metadata` arguments passed to the
  10 /// compiler. Together with the crate-name forms a unique global identifier for
  11 /// the crate.
  12 #[derive(Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Clone, Copy, Encodable, Decodable)]
  13 pub struct CrateDisambiguator(Fingerprint);
  14
  15 impl CrateDisambiguator {
  16     pub fn to_fingerprint(self) -> Fingerprint {
  17         self.0
  18     }
  19 }
  20
  21 impl fmt::Display for CrateDisambiguator {
  22     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
  23         let (a, b) = self.0.as_value();
  24         let as_u128 = a as u128 | ((b as u128) << 64);
  25         f.write_str(&base_n::encode(as_u128, base_n::CASE_INSENSITIVE))
  26     }
  27 }
  28
  29 impl From<Fingerprint> for CrateDisambiguator {
  30     fn from(fingerprint: Fingerprint) -> CrateDisambiguator {
  31         CrateDisambiguator(fingerprint)
  32     }
  33 }
  34
  35 impl_stable_hash_via_hash!(CrateDisambiguator);