Declare DefIndex with the newtype_index macro

Author: fdrinck

src/librustc/hir/def_id.rs

@@ -96,34 +96,20 @@ impl fmt::Display for CrateNum {
 impl serialize::UseSpecializedEncodable for CrateNum {}
 impl serialize::UseSpecializedDecodable for CrateNum {}
 
-/// A DefIndex is an index into the hir-map for a crate, identifying a
-/// particular definition. It should really be considered an interned
-/// shorthand for a particular DefPath.
-#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Copy)]
-pub struct DefIndex(u32);
-
-/// The crate root is always assigned index 0 by the AST Map code,
-/// thanks to `NodeCollector::new`.
-pub const CRATE_DEF_INDEX: DefIndex = DefIndex(0);
+newtype_index! {
+    /// A DefIndex is an index into the hir-map for a crate, identifying a
+    /// particular definition. It should really be considered an interned
+    /// shorthand for a particular DefPath.
+    pub struct DefIndex {
+        DEBUG_FORMAT = "DefIndex({})",
 
-impl fmt::Debug for DefIndex {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "DefIndex({})", self.as_array_index())
+        /// The crate root is always assigned index 0 by the AST Map code,
+        /// thanks to `NodeCollector::new`.
+        const CRATE_DEF_INDEX = 0,
     }
 }
 
 impl DefIndex {
-    /// Converts this DefIndex into a zero-based array index.
-    #[inline]
-    pub fn as_array_index(&self) -> usize {
-        self.0 as usize
-    }
-
-    #[inline]
-    pub fn from_array_index(i: usize) -> DefIndex {
-        DefIndex(i as u32)
-    }
-
     // Proc macros from a proc-macro crate have a kind of virtual DefIndex. This
     // function maps the index of the macro within the crate (which is also the
     // index of the macro in the CrateMetadata::proc_macros array) to the
@@ -132,7 +118,7 @@ impl DefIndex {
         // DefIndex for proc macros start from FIRST_FREE_DEF_INDEX,
         // because the first FIRST_FREE_DEF_INDEX indexes are reserved
         // for internal use.
-        let def_index = DefIndex::from_array_index(
+        let def_index = DefIndex::from(
             proc_macro_index.checked_add(FIRST_FREE_DEF_INDEX)
                 .expect("integer overflow adding `proc_macro_index`"));
         assert!(def_index != CRATE_DEF_INDEX);
@@ -141,19 +127,11 @@ impl DefIndex {
 
     // This function is the reverse of from_proc_macro_index() above.
     pub fn to_proc_macro_index(self: DefIndex) -> usize {
-        self.as_array_index().checked_sub(FIRST_FREE_DEF_INDEX)
+        self.index().checked_sub(FIRST_FREE_DEF_INDEX)
             .unwrap_or_else(|| {
                 bug!("using local index {:?} as proc-macro index", self)
             })
     }
-
-    pub fn from_raw_u32(x: u32) -> DefIndex {
-        DefIndex(x)
-    }
-
-    pub fn as_raw_u32(&self) -> u32 {
-        self.0
-    }
 }
 
 impl serialize::UseSpecializedEncodable for DefIndex {}
@@ -169,7 +147,7 @@ pub struct DefId {
 
 impl fmt::Debug for DefId {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "DefId({}:{}", self.krate, self.index.as_array_index())?;
+        write!(f, "DefId({}:{}", self.krate, self.index.index())?;
 
         ty::tls::with_opt(|opt_tcx| {
             if let Some(tcx) = opt_tcx {

src/librustc/hir/map/collector.rs

@@ -226,7 +226,7 @@ impl<'a, 'hir> NodeCollector<'a, 'hir> {
 
     fn insert_entry(&mut self, id: HirId, entry: Entry<'hir>) {
         debug!("hir_map: {:?} => {:?}", id, entry);
-        let local_map = &mut self.map[id.owner.as_array_index()];
+        let local_map = &mut self.map[id.owner.index()];
         let i = id.local_id.as_u32() as usize;
         if local_map.is_none() {
             *local_map = Some(IndexVec::with_capacity(i + 1));

src/librustc/hir/map/definitions.rs

@@ -38,7 +38,7 @@ impl DefPathTable {
                 def_path_hash: DefPathHash)
                 -> DefIndex {
         let index = {
-            let index = DefIndex::from_array_index(self.index_to_key.len());
+            let index = DefIndex::from(self.index_to_key.len());
             debug!("DefPathTable::insert() - {:?} <-> {:?}", key, index);
             self.index_to_key.push(key);
             index
@@ -49,17 +49,17 @@ impl DefPathTable {
     }
 
     pub fn next_id(&self) -> DefIndex {
-        DefIndex::from_array_index(self.index_to_key.len())
+        DefIndex::from(self.index_to_key.len())
     }
 
     #[inline(always)]
     pub fn def_key(&self, index: DefIndex) -> DefKey {
-        self.index_to_key[index.as_array_index()].clone()
+        self.index_to_key[index.index()].clone()
     }
 
     #[inline(always)]
     pub fn def_path_hash(&self, index: DefIndex) -> DefPathHash {
-        let ret = self.def_path_hashes[index.as_array_index()];
+        let ret = self.def_path_hashes[index.index()];
         debug!("def_path_hash({:?}) = {:?}", index, ret);
         return ret
     }
@@ -74,7 +74,7 @@ impl DefPathTable {
                 .map(|(index, &hash)| {
                     let def_id = DefId {
                         krate: cnum,
-                        index: DefIndex::from_array_index(index),
+                        index: DefIndex::from(index),
                     };
                     (hash, def_id)
                 })
@@ -387,7 +387,7 @@ impl Definitions {
     #[inline]
     pub fn as_local_node_id(&self, def_id: DefId) -> Option<ast::NodeId> {
         if def_id.krate == LOCAL_CRATE {
-            let node_id = self.def_index_to_node[def_id.index.as_array_index()];
+            let node_id = self.def_index_to_node[def_id.index.index()];
             if node_id != ast::DUMMY_NODE_ID {
                 return Some(node_id);
             }
@@ -417,7 +417,7 @@ impl Definitions {
 
     #[inline]
     pub fn def_index_to_hir_id(&self, def_index: DefIndex) -> hir::HirId {
-        let node_id = self.def_index_to_node[def_index.as_array_index()];
+        let node_id = self.def_index_to_node[def_index.index()];
         self.node_to_hir_id[node_id]
     }
 
@@ -508,7 +508,7 @@ impl Definitions {
 
         // Create the definition.
         let index = self.table.allocate(key, def_path_hash);
-        assert_eq!(index.as_array_index(), self.def_index_to_node.len());
+        assert_eq!(index.index(), self.def_index_to_node.len());
         self.def_index_to_node.push(node_id);
 
         // Some things for which we allocate DefIndices don't correspond to
@@ -653,7 +653,7 @@ macro_rules! define_global_metadata_kind {
                                           .position(|k| *k == def_key)
                                           .unwrap();
 
-                DefIndex::from_array_index(index)
+                DefIndex::from(index)
             }
 
             fn name(&self) -> Symbol {

src/librustc/hir/map/mod.rs

@@ -189,7 +189,7 @@ pub struct Map<'hir> {
 impl<'hir> Map<'hir> {
     #[inline]
     fn lookup(&self, id: HirId) -> Option<&Entry<'hir>> {
-        let local_map = self.map.get(id.owner.as_array_index())?;
+        let local_map = self.map.get(id.owner.index())?;
         local_map.as_ref()?.get(id.local_id)?.as_ref()
     }
 
@@ -1023,7 +1023,7 @@ impl<'hir> Map<'hir> {
             local_map.iter_enumerated().filter_map(move |(i, entry)| entry.map(move |_| {
                 // Reconstruct the HirId based on the 3 indices we used to find it
                 HirId {
-                    owner: DefIndex::from_array_index(array_index),
+                    owner: DefIndex::from(array_index),
                     local_id: i,
                 }
             }))

src/librustc/infer/lexical_region_resolve/graphviz.rs

@@ -56,7 +56,7 @@ pub fn maybe_print_constraints_for<'a, 'gcx, 'tcx>(
     }
 
     let requested_node = env::var("RUST_REGION_GRAPH_NODE")
-        .ok().and_then(|s| s.parse().map(DefIndex::from_raw_u32).ok());
+        .ok().and_then(|s| s.parse().map(DefIndex::from_u32).ok());
 
     if requested_node.is_some() && requested_node != Some(context.index) {
         return;
@@ -90,7 +90,7 @@ pub fn maybe_print_constraints_for<'a, 'gcx, 'tcx>(
             let mut new_str = String::new();
             for c in output_template.chars() {
                 if c == '%' {
-                    new_str.push_str(&context.index.as_raw_u32().to_string());
+                    new_str.push_str(&context.index.as_u32().to_string());
                 } else {
                     new_str.push(c);
                 }

src/librustc/traits/specialize/mod.rs

@@ -298,7 +298,7 @@ pub(super) fn specialization_graph_provider<'a, 'tcx>(
     // negated `CrateNum` (so remote definitions are visited first) and then
     // by a flattened version of the `DefIndex`.
     trait_impls.sort_unstable_by_key(|def_id| {
-        (-(def_id.krate.as_u32() as i64), def_id.index.as_array_index())
+        (-(def_id.krate.as_u32() as i64), def_id.index.index())
     });
 
     for impl_def_id in trait_impls {

src/librustc_driver/pretty.rs

@@ -648,7 +648,7 @@ fn print_flowgraph<'a, 'tcx, W: Write>(variants: Vec<borrowck_dot::Variant>,
     // have to be user friendly.
     let name = format!(
         "hir_id_{}_{}",
-        hir_id.owner.as_array_index(),
+        hir_id.owner.index(),
         hir_id.local_id.index(),
     );
     let lcfg = LabelledCFG {

src/librustc_metadata/decoder.rs

@@ -264,7 +264,7 @@ impl<'a, 'tcx> SpecializedDecoder<DefId> for DecodeContext<'a, 'tcx> {
 impl<'a, 'tcx> SpecializedDecoder<DefIndex> for DecodeContext<'a, 'tcx> {
     #[inline]
     fn specialized_decode(&mut self) -> Result<DefIndex, Self::Error> {
-        Ok(DefIndex::from_raw_u32(self.read_u32()?))
+        Ok(DefIndex::from_u32(self.read_u32()?))
     }
 }
 

src/librustc_metadata/encoder.rs

@@ -134,7 +134,7 @@ impl<'a, 'tcx> SpecializedEncoder<DefId> for EncodeContext<'a, 'tcx> {
 impl<'a, 'tcx> SpecializedEncoder<DefIndex> for EncodeContext<'a, 'tcx> {
     #[inline]
     fn specialized_encode(&mut self, def_index: &DefIndex) -> Result<(), Self::Error> {
-        self.emit_u32(def_index.as_raw_u32())
+        self.emit_u32(def_index.as_u32())
     }
 }
 

src/librustc_metadata/index.rs

@@ -93,7 +93,7 @@ impl Index {
     pub fn record_index(&mut self, item: DefIndex, entry: Lazy<Entry<'_>>) {
         assert!(entry.position < (u32::MAX as usize));
         let position = entry.position as u32;
-        let array_index = item.as_array_index();
+        let array_index = item.index();
 
         let positions = &mut self.positions;
         assert!(u32::read_from_bytes_at(positions, array_index) == u32::MAX,
@@ -126,7 +126,7 @@ impl<'tcx> LazySeq<Index> {
                def_index,
                self.len);
 
-        let position = u32::read_from_bytes_at(bytes, 1 + def_index.as_array_index());
+        let position = u32::read_from_bytes_at(bytes, 1 + def_index.index());
         if position == u32::MAX {
             debug!("Index::lookup: position=u32::MAX");
             None