Auto merge of #127479 - Urgau:rustc-stable-hash, r=michaelwoerister

Use rustc-stable-hash in the compiler

Following rust-lang/compiler-team#755 and the release of the crate on crates.io, let's now use it in the compiler and remove the old implementation.

cc `@michaelwoerister`
r? ghost

Author: bors

Cargo.lock

@@ -3514,6 +3514,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5be1bdc7edf596692617627bbfeaba522131b18e06ca4df2b6b689e3c5d5ce84"
 
+[[package]]
+name = "rustc-stable-hash"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5c9f15eec8235d7cb775ee6f81891db79b98fd54ba1ad8fae565b88ef1ae4e2"
+
 [[package]]
 name = "rustc-std-workspace-alloc"
 version = "1.99.0"
@@ -3852,6 +3858,7 @@ dependencies = [
  "portable-atomic",
  "rustc-hash",
  "rustc-rayon",
+ "rustc-stable-hash",
  "rustc_arena",
  "rustc_graphviz",
  "rustc_index",

compiler/rustc_data_structures/Cargo.toml

@@ -15,6 +15,7 @@ jobserver_crate = { version = "0.1.28", package = "jobserver" }
 measureme = "11"
 rustc-hash = "1.1.0"
 rustc-rayon = { version = "0.5.0", optional = true }
+rustc-stable-hash = { version = "0.1.0", features = ["nightly"] }
 rustc_arena = { path = "../rustc_arena" }
 rustc_graphviz = { path = "../rustc_graphviz" }
 rustc_index = { path = "../rustc_index", package = "rustc_index" }

compiler/rustc_data_structures/src/fingerprint.rs

@@ -1,5 +1,5 @@
 use crate::stable_hasher::impl_stable_traits_for_trivial_type;
-use crate::stable_hasher::{Hash64, StableHasher, StableHasherResult};
+use crate::stable_hasher::{FromStableHash, Hash64, StableHasherHash};
 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
 use std::hash::{Hash, Hasher};
 
@@ -154,10 +154,11 @@ impl FingerprintHasher for crate::unhash::Unhasher {
     }
 }
 
-impl StableHasherResult for Fingerprint {
+impl FromStableHash for Fingerprint {
+    type Hash = StableHasherHash;
+
     #[inline]
-    fn finish(hasher: StableHasher) -> Self {
-        let (_0, _1) = hasher.finalize();
+    fn from(StableHasherHash([_0, _1]): Self::Hash) -> Self {
         Fingerprint(_0, _1)
     }
 }

compiler/rustc_data_structures/src/hashes.rs

@@ -11,7 +11,7 @@
 //! connect the fact that they can only be produced by a `StableHasher` to their
 //! `Encode`/`Decode` impls.
 
-use crate::stable_hasher::{StableHasher, StableHasherResult};
+use crate::stable_hasher::{FromStableHash, StableHasherHash};
 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
 use std::fmt;
 use std::ops::BitXorAssign;
@@ -56,10 +56,12 @@ impl<D: Decoder> Decodable<D> for Hash64 {
     }
 }
 
-impl StableHasherResult for Hash64 {
+impl FromStableHash for Hash64 {
+    type Hash = StableHasherHash;
+
     #[inline]
-    fn finish(hasher: StableHasher) -> Self {
-        Self { inner: hasher.finalize().0 }
+    fn from(StableHasherHash([_0, __1]): Self::Hash) -> Self {
+        Self { inner: _0 }
     }
 }
 
@@ -121,10 +123,11 @@ impl<D: Decoder> Decodable<D> for Hash128 {
     }
 }
 
-impl StableHasherResult for Hash128 {
+impl FromStableHash for Hash128 {
+    type Hash = StableHasherHash;
+
     #[inline]
-    fn finish(hasher: StableHasher) -> Self {
-        let (_0, _1) = hasher.finalize();
+    fn from(StableHasherHash([_0, _1]): Self::Hash) -> Self {
         Self { inner: u128::from(_0) | (u128::from(_1) << 64) }
     }
 }

compiler/rustc_data_structures/src/lib.rs

@@ -24,7 +24,6 @@
 #![feature(core_intrinsics)]
 #![feature(extend_one)]
 #![feature(hash_raw_entry)]
-#![feature(hasher_prefixfree_extras)]
 #![feature(macro_metavar_expr)]
 #![feature(map_try_insert)]
 #![feature(min_specialization)]
@@ -67,7 +66,6 @@ pub mod owned_slice;
 pub mod packed;
 pub mod profiling;
 pub mod sharded;
-pub mod sip128;
 pub mod small_c_str;
 pub mod snapshot_map;
 pub mod sorted_map;