Make a newtype for DefPathHash so they are not confused with content hashes

src/librustc/hir/map/definitions.rs

@@ -36,7 +36,7 @@
 pub struct DefPathTable {
     index_to_key: [Vec<DefKey>; 2],
     key_to_index: FxHashMap<DefKey, DefIndex>,
-    def_path_hashes: [Vec<Fingerprint>; 2],
+    def_path_hashes: [Vec<DefPathHash>; 2],
 }
 
 // Unfortunately we have to provide a manual impl of Clone because of the
@@ -57,7 +57,7 @@ impl DefPathTable {
 
     fn allocate(&mut self,
                 key: DefKey,
-                def_path_hash: Fingerprint,
+                def_path_hash: DefPathHash,
                 address_space: DefIndexAddressSpace)
                 -> DefIndex {
         let index = {
@@ -81,7 +81,7 @@ pub fn def_key(&self, index: DefIndex) -> DefKey {
     }
 
     #[inline(always)]
-    pub fn def_path_hash(&self, index: DefIndex) -> Fingerprint {
+    pub fn def_path_hash(&self, index: DefIndex) -> DefPathHash {
         self.def_path_hashes[index.address_space().index()]
                             [index.as_array_index()]
     }
@@ -148,8 +148,8 @@ fn decode<D: Decoder>(d: &mut D) -> Result<DefPathTable, D::Error> {
         let index_to_key_lo: Vec<DefKey> = Decodable::decode(d)?;
         let index_to_key_hi: Vec<DefKey> = Decodable::decode(d)?;
 
-        let def_path_hashes_lo: Vec<Fingerprint> = Decodable::decode(d)?;
-        let def_path_hashes_hi: Vec<Fingerprint> = Decodable::decode(d)?;
+        let def_path_hashes_lo: Vec<DefPathHash> = Decodable::decode(d)?;
+        let def_path_hashes_hi: Vec<DefPathHash> = Decodable::decode(d)?;
 
         let index_to_key = [index_to_key_lo, index_to_key_hi];
         let def_path_hashes = [def_path_hashes_lo, def_path_hashes_hi];
@@ -216,7 +216,7 @@ pub struct DefKey {
 }
 
 impl DefKey {
-    fn compute_stable_hash(&self, parent_hash: Fingerprint) -> Fingerprint {
+    fn compute_stable_hash(&self, parent_hash: DefPathHash) -> DefPathHash {
         let mut hasher = StableHasher::new();
 
         // We hash a 0u8 here to disambiguate between regular DefPath hashes,
@@ -224,17 +224,17 @@ fn compute_stable_hash(&self, parent_hash: Fingerprint) -> Fingerprint {
         0u8.hash(&mut hasher);
         parent_hash.hash(&mut hasher);
         self.disambiguated_data.hash(&mut hasher);
-        hasher.finish()
+        DefPathHash(hasher.finish())
     }
 
-    fn root_parent_stable_hash(crate_name: &str, crate_disambiguator: &str) -> Fingerprint {
+    fn root_parent_stable_hash(crate_name: &str, crate_disambiguator: &str) -> DefPathHash {
         let mut hasher = StableHasher::new();
         // Disambiguate this from a regular DefPath hash,
         // see compute_stable_hash() above.
         1u8.hash(&mut hasher);
         crate_name.hash(&mut hasher);
         crate_disambiguator.hash(&mut hasher);
-        hasher.finish()
+        DefPathHash(hasher.finish())
     }
 }
 
@@ -372,6 +372,12 @@ pub enum DefPathData {
     Typeof,
 }
 
+#[derive(Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord, Debug,
+         RustcEncodable, RustcDecodable)]
+pub struct DefPathHash(pub Fingerprint);
+
+impl_stable_hash_for!(tuple_struct DefPathHash { fingerprint });
+
 impl Definitions {
     /// Create new empty definition map.
     pub fn new() -> Definitions {
@@ -404,7 +410,7 @@ pub fn def_key(&self, index: DefIndex) -> DefKey {
     }
 
     #[inline(always)]
-    pub fn def_path_hash(&self, index: DefIndex) -> Fingerprint {
+    pub fn def_path_hash(&self, index: DefIndex) -> DefPathHash {
         self.table.def_path_hash(index)
     }
 

src/librustc/hir/map/mod.rs

@@ -13,7 +13,7 @@
 use self::collector::NodeCollector;
 pub use self::def_collector::{DefCollector, MacroInvocationData};
 pub use self::definitions::{Definitions, DefKey, DefPath, DefPathData,
-                            DisambiguatedDefPathData};
+                            DisambiguatedDefPathData, DefPathHash};
 
 use dep_graph::{DepGraph, DepNode};
 

src/librustc/ich/hcx.rs

@@ -10,6 +10,7 @@
 
 use hir;
 use hir::def_id::DefId;
+use hir::map::DefPathHash;
 use ich::{self, CachingCodemapView};
 use session::config::DebugInfoLevel::NoDebugInfo;
 use ty;
@@ -115,7 +116,7 @@ pub fn tcx(&self) -> ty::TyCtxt<'a, 'tcx, 'tcx> {
     }
 
     #[inline]
-    pub fn def_path_hash(&mut self, def_id: DefId) -> ich::Fingerprint {
+    pub fn def_path_hash(&mut self, def_id: DefId) -> DefPathHash {
         self.tcx.def_path_hash(def_id)
     }
 

src/librustc/middle/cstore.rs

@@ -281,7 +281,7 @@ fn retrace_path(&self,
                     -> Option<DefId>;
     fn def_key(&self, def: DefId) -> DefKey;
     fn def_path(&self, def: DefId) -> hir_map::DefPath;
-    fn def_path_hash(&self, def: DefId) -> ich::Fingerprint;
+    fn def_path_hash(&self, def: DefId) -> hir_map::DefPathHash;
     fn struct_field_names(&self, def: DefId) -> Vec<ast::Name>;
     fn item_children(&self, did: DefId) -> Vec<def::Export>;
     fn load_macro(&self, did: DefId, sess: &Session) -> LoadedMacro;
@@ -412,8 +412,8 @@ fn def_key(&self, def: DefId) -> DefKey { bug!("def_key") }
     fn def_path(&self, def: DefId) -> hir_map::DefPath {
         bug!("relative_def_path")
     }
-    fn def_path_hash(&self, def: DefId) -> ich::Fingerprint {
-        bug!("wa")
+    fn def_path_hash(&self, def: DefId) -> hir_map::DefPathHash {
+        bug!("def_path_hash")
     }
     fn struct_field_names(&self, def: DefId) -> Vec<ast::Name> { bug!("struct_field_names") }
     fn item_children(&self, did: DefId) -> Vec<def::Export> { bug!("item_children") }

src/librustc/ty/mod.rs

@@ -19,7 +19,7 @@
 use hir::{map as hir_map, FreevarMap, TraitMap};
 use hir::def::{Def, CtorKind, ExportMap};
 use hir::def_id::{CrateNum, DefId, DefIndex, CRATE_DEF_INDEX, LOCAL_CRATE};
-use ich::{self, StableHashingContext};
+use ich::StableHashingContext;
 use middle::const_val::ConstVal;
 use middle::lang_items::{FnTraitLangItem, FnMutTraitLangItem, FnOnceTraitLangItem};
 use middle::privacy::AccessLevels;
@@ -2244,7 +2244,7 @@ pub fn def_path(self, id: DefId) -> hir_map::DefPath {
     }
 
     #[inline]
-    pub fn def_path_hash(self, def_id: DefId) -> ich::Fingerprint {
+    pub fn def_path_hash(self, def_id: DefId) -> hir_map::DefPathHash {
         if def_id.is_local() {
             self.hir.definitions().def_path_hash(def_id.index)
         } else {

src/librustc/ty/sty.rs

@@ -11,6 +11,7 @@
 //! This module contains TypeVariants and its major components
 
 use hir::def_id::DefId;
+use hir::map::DefPathHash;
 
 use middle::region;
 use ty::subst::Substs;
@@ -29,7 +30,6 @@
 use serialize;
 
 use hir;
-use ich;
 
 use self::InferTy::*;
 use self::TypeVariants::*;
@@ -850,7 +850,7 @@ pub fn item_name(&self) -> Name {
         self.item_name // safe to skip the binder to access a name
     }
 
-    pub fn sort_key(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> (ich::Fingerprint, InternedString) {
+    pub fn sort_key(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> (DefPathHash, InternedString) {
         // We want something here that is stable across crate boundaries.
         // The DefId isn't but the `deterministic_hash` of the corresponding
         // DefPath is.
@@ -885,7 +885,7 @@ pub fn item_name(&self) -> Name {
         self.skip_binder().item_name()
     }
 
-    pub fn sort_key(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> (ich::Fingerprint, InternedString) {
+    pub fn sort_key(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> (DefPathHash, InternedString) {
         self.skip_binder().sort_key(tcx)
     }
 

src/librustc/ty/trait_def.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 use hir::def_id::DefId;
-use ich::Fingerprint;
+use hir::map::DefPathHash;
 use traits::specialization_graph;
 use ty::fast_reject;
 use ty::fold::TypeFoldable;
@@ -33,7 +33,7 @@ pub struct TraitDef {
 
     /// The ICH of this trait's DefPath, cached here so it doesn't have to be
     /// recomputed all the time.
-    pub def_path_hash: Fingerprint,
+    pub def_path_hash: DefPathHash,
 }
 
 // We don't store the list of impls in a flat list because each cached list of
@@ -95,7 +95,7 @@ pub fn new(def_id: DefId,
                unsafety: hir::Unsafety,
                paren_sugar: bool,
                has_default_impl: bool,
-               def_path_hash: Fingerprint)
+               def_path_hash: DefPathHash)
                -> TraitDef {
         TraitDef {
             def_id,

src/librustc_incremental/calculate_svh/mod.rs

@@ -32,6 +32,7 @@
 use rustc::dep_graph::DepNode;
 use rustc::hir;
 use rustc::hir::def_id::{CRATE_DEF_INDEX, DefId};
+use rustc::hir::map::DefPathHash;
 use rustc::hir::itemlikevisit::ItemLikeVisitor;
 use rustc::ich::{Fingerprint, StableHashingContext};
 use rustc::ty::TyCtxt;
@@ -218,7 +219,7 @@ fn compute_and_store_ich_for_trait_impls(&mut self, krate: &'tcx hir::Crate)
     {
         let tcx = self.hcx.tcx();
 
-        let mut impls: Vec<(Fingerprint, Fingerprint)> = krate
+        let mut impls: Vec<(DefPathHash, Fingerprint)> = krate
             .trait_impls
             .iter()
             .map(|(&trait_id, impls)| {

src/librustc_metadata/cstore_impl.rs

@@ -17,7 +17,6 @@
                             ExternCrate, NativeLibrary, MetadataLoader, LinkMeta,
                             LinkagePreference, LoadedMacro, EncodedMetadata};
 use rustc::hir::def;
-use rustc::ich;
 use rustc::middle::lang_items;
 use rustc::session::Session;
 use rustc::ty::{self, TyCtxt};
@@ -25,7 +24,7 @@
 use rustc::hir::def_id::{CrateNum, DefId, DefIndex, CRATE_DEF_INDEX, LOCAL_CRATE};
 
 use rustc::dep_graph::{DepNode, GlobalMetaDataKind};
-use rustc::hir::map::{DefKey, DefPath, DisambiguatedDefPathData};
+use rustc::hir::map::{DefKey, DefPath, DisambiguatedDefPathData, DefPathHash};
 use rustc::util::nodemap::{NodeSet, DefIdMap};
 use rustc_back::PanicStrategy;
 
@@ -334,7 +333,7 @@ fn def_path(&self, def: DefId) -> DefPath {
         self.get_crate_data(def.krate).def_path(def.index)
     }
 
-    fn def_path_hash(&self, def: DefId) -> ich::Fingerprint {
+    fn def_path_hash(&self, def: DefId) -> DefPathHash {
         self.get_crate_data(def.krate).def_path_hash(def.index)
     }
 

src/librustc_metadata/decoder.rs

@@ -14,9 +14,8 @@
 use schema::*;
 
 use rustc::dep_graph::{DepGraph, DepNode, GlobalMetaDataKind};
-use rustc::hir::map::{DefKey, DefPath, DefPathData};
+use rustc::hir::map::{DefKey, DefPath, DefPathData, DefPathHash};
 use rustc::hir;
-use rustc::ich;
 
 use rustc::middle::cstore::LinkagePreference;
 use rustc::hir::def::{self, Def, CtorKind};
@@ -1109,7 +1108,7 @@ pub fn def_path(&self, id: DefIndex) -> DefPath {
     }
 
     #[inline]
-    pub fn def_path_hash(&self, index: DefIndex) -> ich::Fingerprint {
+    pub fn def_path_hash(&self, index: DefIndex) -> DefPathHash {
         self.def_path_table.def_path_hash(index)
     }