Auto merge of #44142 - alexcrichton:dllimport-query, r=nikomatsakis

Migrate a slew of metadata methods to queries

This PR intends to make more progress on #41417, knocking off some low-hanging fruit.

Closes #44190
cc #44137

Author: bors

src/librustc/dep_graph/dep_node.rs

@@ -511,8 +511,8 @@ define_dep_nodes!( <'tcx>
     [] ParamEnv(DefId),
     [] DescribeDef(DefId),
     [] DefSpan(DefId),
-    [] Stability(DefId),
-    [] Deprecation(DefId),
+    [] LookupStability(DefId),
+    [] LookupDeprecationEntry(DefId),
     [] ItemBodyNestedBodies(DefId),
     [] ConstIsRvaluePromotableToStatic(DefId),
     [] ImplParent(DefId),
@@ -521,16 +521,60 @@ define_dep_nodes!( <'tcx>
     [] IsMirAvailable(DefId),
     [] ItemAttrs(DefId),
     [] FnArgNames(DefId),
-    [] DylibDepFormats(DefId),
-    [] IsAllocator(DefId),
-    [] IsPanicRuntime(DefId),
-    [] IsCompilerBuiltins(DefId),
-    [] HasGlobalAllocator(DefId),
+    [] DylibDepFormats(CrateNum),
+    [] IsPanicRuntime(CrateNum),
+    [] IsCompilerBuiltins(CrateNum),
+    [] HasGlobalAllocator(CrateNum),
     [] ExternCrate(DefId),
     [] LintLevels,
     [] Specializes { impl1: DefId, impl2: DefId },
     [] InScopeTraits(HirId),
     [] ModuleExports(HirId),
+    [] IsSanitizerRuntime(CrateNum),
+    [] IsProfilerRuntime(CrateNum),
+    [] GetPanicStrategy(CrateNum),
+    [] IsNoBuiltins(CrateNum),
+    [] ImplDefaultness(DefId),
+    [] ExportedSymbols(CrateNum),
+    [] NativeLibraries(CrateNum),
+    [] PluginRegistrarFn(CrateNum),
+    [] DeriveRegistrarFn(CrateNum),
+    [] CrateDisambiguator(CrateNum),
+    [] CrateHash(CrateNum),
+    [] OriginalCrateName(CrateNum),
+
+    [] ImplementationsOfTrait { krate: CrateNum, trait_id: DefId },
+    [] AllTraitImplementations(CrateNum),
+
+    [] IsDllimportForeignItem(DefId),
+    [] IsStaticallyIncludedForeignItem(DefId),
+    [] NativeLibraryKind(DefId),
+    [] LinkArgs,
+
+    [] NamedRegion(HirId),
+    [] IsLateBound(HirId),
+    [] ObjectLifetimeDefaults(HirId),
+
+    [] Visibility(DefId),
+    [] DepKind(CrateNum),
+    [] CrateName(CrateNum),
+    [] ItemChildren(DefId),
+    [] ExternModStmtCnum(HirId),
+    [] GetLangItems,
+    [] DefinedLangItems(CrateNum),
+    [] MissingLangItems(CrateNum),
+    [] ExternConstBody(DefId),
+    [] VisibleParentMap,
+    [] IsDirectExternCrate(CrateNum),
+    [] MissingExternCrateItem(CrateNum),
+    [] UsedCrateSource(CrateNum),
+    [] PostorderCnums,
+
+    [] Freevars(HirId),
+    [] MaybeUnusedTraitImport(HirId),
+    [] MaybeUnusedExternCrates,
+    [] StabilityIndex,
+    [] AllCrateNums,
 );
 
 trait DepNodeParams<'a, 'gcx: 'tcx + 'a, 'tcx: 'a> : fmt::Debug {

src/librustc/dep_graph/graph.rs

@@ -235,10 +235,13 @@ impl DepGraph {
                                           debug_str_gen: F)
         where F: FnOnce() -> String
     {
-        let mut dep_node_debug = self.data.as_ref().unwrap().dep_node_debug.borrow_mut();
+        let dep_node_debug = &self.data.as_ref().unwrap().dep_node_debug;
 
-        dep_node_debug.entry(dep_node)
-                      .or_insert_with(debug_str_gen);
+        if dep_node_debug.borrow().contains_key(&dep_node) {
+            return
+        }
+        let debug_str = debug_str_gen();
+        dep_node_debug.borrow_mut().insert(dep_node, debug_str);
     }
 
     pub(super) fn dep_node_debug_str(&self, dep_node: DepNode) -> Option<String> {

src/librustc/hir/lowering.rs

@@ -787,7 +787,7 @@ impl<'a> LoweringContext<'a> {
                         return n;
                     }
                     assert!(!def_id.is_local());
-                    let n = self.sess.cstore.item_generics_cloned(def_id).regions.len();
+                    let n = self.sess.cstore.item_generics_cloned_untracked(def_id).regions.len();
                     self.type_def_lifetime_params.insert(def_id, n);
                     n
                 });
@@ -2863,7 +2863,7 @@ impl<'a> LoweringContext<'a> {
         let parent_def = self.parent_def.unwrap();
         let def_id = {
             let defs = self.resolver.definitions();
-            let def_path_data = DefPathData::Binding(name);
+            let def_path_data = DefPathData::Binding(name.as_str());
             let def_index = defs.create_def_with_parent(parent_def,
                                                         node_id,
                                                         def_path_data,

src/librustc/hir/map/def_collector.rs

@@ -104,14 +104,14 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
                 DefPathData::Impl,
             ItemKind::Enum(..) | ItemKind::Struct(..) | ItemKind::Union(..) | ItemKind::Trait(..) |
             ItemKind::ExternCrate(..) | ItemKind::ForeignMod(..) | ItemKind::Ty(..) =>
-                DefPathData::TypeNs(i.ident.name),
+                DefPathData::TypeNs(i.ident.name.as_str()),
             ItemKind::Mod(..) if i.ident == keywords::Invalid.ident() => {
                 return visit::walk_item(self, i);
             }
-            ItemKind::Mod(..) => DefPathData::Module(i.ident.name),
+            ItemKind::Mod(..) => DefPathData::Module(i.ident.name.as_str()),
             ItemKind::Static(..) | ItemKind::Const(..) | ItemKind::Fn(..) =>
-                DefPathData::ValueNs(i.ident.name),
-            ItemKind::MacroDef(..) => DefPathData::MacroDef(i.ident.name),
+                DefPathData::ValueNs(i.ident.name.as_str()),
+            ItemKind::MacroDef(..) => DefPathData::MacroDef(i.ident.name.as_str()),
             ItemKind::Mac(..) => return self.visit_macro_invoc(i.id, false),
             ItemKind::GlobalAsm(..) => DefPathData::Misc,
             ItemKind::Use(ref view_path) => {
@@ -139,13 +139,15 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
                     for v in &enum_definition.variants {
                         let variant_def_index =
                             this.create_def(v.node.data.id(),
-                                            DefPathData::EnumVariant(v.node.name.name),
+                                            DefPathData::EnumVariant(v.node.name.name.as_str()),
                                             REGULAR_SPACE);
                         this.with_parent(variant_def_index, |this| {
                             for (index, field) in v.node.data.fields().iter().enumerate() {
                                 let name = field.ident.map(|ident| ident.name)
                                     .unwrap_or_else(|| Symbol::intern(&index.to_string()));
-                                this.create_def(field.id, DefPathData::Field(name), REGULAR_SPACE);
+                                this.create_def(field.id,
+                                                DefPathData::Field(name.as_str()),
+                                                REGULAR_SPACE);
                             }
 
                             if let Some(ref expr) = v.node.disr_expr {
@@ -165,7 +167,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
                     for (index, field) in struct_def.fields().iter().enumerate() {
                         let name = field.ident.map(|ident| ident.name)
                             .unwrap_or_else(|| Symbol::intern(&index.to_string()));
-                        this.create_def(field.id, DefPathData::Field(name), REGULAR_SPACE);
+                        this.create_def(field.id, DefPathData::Field(name.as_str()), REGULAR_SPACE);
                     }
                 }
                 _ => {}
@@ -176,7 +178,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
 
     fn visit_foreign_item(&mut self, foreign_item: &'a ForeignItem) {
         let def = self.create_def(foreign_item.id,
-                                  DefPathData::ValueNs(foreign_item.ident.name),
+                                  DefPathData::ValueNs(foreign_item.ident.name.as_str()),
                                   REGULAR_SPACE);
 
         self.with_parent(def, |this| {
@@ -187,7 +189,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
     fn visit_generics(&mut self, generics: &'a Generics) {
         for ty_param in generics.ty_params.iter() {
             self.create_def(ty_param.id,
-                            DefPathData::TypeParam(ty_param.ident.name),
+                            DefPathData::TypeParam(ty_param.ident.name.as_str()),
                             REGULAR_SPACE);
         }
 
@@ -197,8 +199,8 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
     fn visit_trait_item(&mut self, ti: &'a TraitItem) {
         let def_data = match ti.node {
             TraitItemKind::Method(..) | TraitItemKind::Const(..) =>
-                DefPathData::ValueNs(ti.ident.name),
-            TraitItemKind::Type(..) => DefPathData::TypeNs(ti.ident.name),
+                DefPathData::ValueNs(ti.ident.name.as_str()),
+            TraitItemKind::Type(..) => DefPathData::TypeNs(ti.ident.name.as_str()),
             TraitItemKind::Macro(..) => return self.visit_macro_invoc(ti.id, false),
         };
 
@@ -215,8 +217,8 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
     fn visit_impl_item(&mut self, ii: &'a ImplItem) {
         let def_data = match ii.node {
             ImplItemKind::Method(..) | ImplItemKind::Const(..) =>
-                DefPathData::ValueNs(ii.ident.name),
-            ImplItemKind::Type(..) => DefPathData::TypeNs(ii.ident.name),
+                DefPathData::ValueNs(ii.ident.name.as_str()),
+            ImplItemKind::Type(..) => DefPathData::TypeNs(ii.ident.name.as_str()),
             ImplItemKind::Macro(..) => return self.visit_macro_invoc(ii.id, false),
         };
 
@@ -237,7 +239,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
             PatKind::Mac(..) => return self.visit_macro_invoc(pat.id, false),
             PatKind::Ident(_, id, _) => {
                 let def = self.create_def(pat.id,
-                                          DefPathData::Binding(id.node.name),
+                                          DefPathData::Binding(id.node.name.as_str()),
                                           REGULAR_SPACE);
                 self.parent_def = Some(def);
             }
@@ -282,7 +284,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
 
     fn visit_lifetime_def(&mut self, def: &'a LifetimeDef) {
         self.create_def(def.lifetime.id,
-                        DefPathData::LifetimeDef(def.lifetime.ident.name),
+                        DefPathData::LifetimeDef(def.lifetime.ident.name.as_str()),
                         REGULAR_SPACE);
     }
 

src/librustc/hir/map/definitions.rs

@@ -80,8 +80,10 @@ impl DefPathTable {
 
     #[inline(always)]
     pub fn def_path_hash(&self, index: DefIndex) -> DefPathHash {
-        self.def_path_hashes[index.address_space().index()]
-                            [index.as_array_index()]
+        let ret = self.def_path_hashes[index.address_space().index()]
+                                      [index.as_array_index()];
+        debug!("def_path_hash({:?}) = {:?}", index, ret);
+        return ret
     }
 
     pub fn add_def_path_hashes_to(&self,
@@ -213,7 +215,7 @@ impl DefKey {
             DefPathData::Binding(name) |
             DefPathData::Field(name) |
             DefPathData::GlobalMetaData(name) => {
-                (*name.as_str()).hash(&mut hasher);
+                name.hash(&mut hasher);
             }
 
             DefPathData::Impl |
@@ -347,31 +349,31 @@ pub enum DefPathData {
     /// An impl
     Impl,
     /// Something in the type NS
-    TypeNs(Symbol),
+    TypeNs(InternedString),
     /// Something in the value NS
-    ValueNs(Symbol),
+    ValueNs(InternedString),
     /// A module declaration
-    Module(Symbol),
+    Module(InternedString),
     /// A macro rule
-    MacroDef(Symbol),
+    MacroDef(InternedString),
     /// A closure expression
     ClosureExpr,
 
     // Subportions of items
     /// A type parameter (generic parameter)
-    TypeParam(Symbol),
+    TypeParam(InternedString),
     /// A lifetime definition
-    LifetimeDef(Symbol),
+    LifetimeDef(InternedString),
     /// A variant of a enum
-    EnumVariant(Symbol),
+    EnumVariant(InternedString),
     /// A struct field
-    Field(Symbol),
+    Field(InternedString),
     /// Implicit ctor for a tuple-like struct
     StructCtor,
     /// Initializer for a const
     Initializer,
     /// Pattern binding
-    Binding(Symbol),
+    Binding(InternedString),
     /// An `impl Trait` type node.
     ImplTrait,
     /// A `typeof` type node.
@@ -380,7 +382,7 @@ pub enum DefPathData {
     /// GlobalMetaData identifies a piece of crate metadata that is global to
     /// a whole crate (as opposed to just one item). GlobalMetaData components
     /// are only supposed to show up right below the crate root.
-    GlobalMetaData(Symbol)
+    GlobalMetaData(InternedString)
 }
 
 #[derive(Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord, Debug,
@@ -601,7 +603,7 @@ impl Definitions {
 }
 
 impl DefPathData {
-    pub fn get_opt_name(&self) -> Option<Symbol> {
+    pub fn get_opt_name(&self) -> Option<InternedString> {
         use self::DefPathData::*;
         match *self {
             TypeNs(name) |
@@ -639,7 +641,7 @@ impl DefPathData {
             Binding(name) |
             Field(name) |
             GlobalMetaData(name) => {
-                return name.as_str();
+                return name
             }
 
             // note that this does not show up in user printouts
@@ -684,7 +686,7 @@ macro_rules! define_global_metadata_kind {
                     definitions.create_def_with_parent(
                         CRATE_DEF_INDEX,
                         ast::DUMMY_NODE_ID,
-                        DefPathData::GlobalMetaData(instance.name()),
+                        DefPathData::GlobalMetaData(instance.name().as_str()),
                         GLOBAL_MD_ADDRESS_SPACE,
                         Mark::root()
                     );
@@ -698,7 +700,7 @@ macro_rules! define_global_metadata_kind {
                 let def_key = DefKey {
                     parent: Some(CRATE_DEF_INDEX),
                     disambiguated_data: DisambiguatedDefPathData {
-                        data: DefPathData::GlobalMetaData(self.name()),
+                        data: DefPathData::GlobalMetaData(self.name().as_str()),
                         disambiguator: 0,
                     }
                 };

src/librustc/hir/map/mod.rs

@@ -878,7 +878,17 @@ impl<'hir> Map<'hir> {
 
             Some(RootCrate(_)) => self.forest.krate.span,
             Some(NotPresent) | None => {
-                bug!("hir::map::Map::span: id not in map: {:?}", id)
+                // Some nodes, notably macro definitions, are not
+                // present in the map for whatever reason, but
+                // they *do* have def-ids. So if we encounter an
+                // empty hole, check for that case.
+                if let Some(def_index) = self.definitions.opt_def_index(id) {
+                    let def_path_hash = self.definitions.def_path_hash(def_index);
+                    self.dep_graph.read(def_path_hash.to_dep_node(DepKind::Hir));
+                    DUMMY_SP
+                } else {
+                    bug!("hir::map::Map::span: id not in map: {:?}", id)
+                }
             }
         }
     }

src/librustc/infer/error_reporting/anon_anon_conflict.rs

@@ -209,18 +209,19 @@ impl<'a, 'gcx, 'tcx> Visitor<'gcx> for FindNestedTypeVisitor<'a, 'gcx, 'tcx> {
 
         match arg.node {
             hir::TyRptr(ref lifetime, _) => {
-                match self.infcx.tcx.named_region_map.defs.get(&lifetime.id) {
+                let hir_id = self.infcx.tcx.hir.node_to_hir_id(lifetime.id);
+                match self.infcx.tcx.named_region(hir_id) {
                     // the lifetime of the TyRptr
-                    Some(&rl::Region::LateBoundAnon(debruijn_index, anon_index)) => {
+                    Some(rl::Region::LateBoundAnon(debruijn_index, anon_index)) => {
                         if debruijn_index.depth == 1 && anon_index == br_index {
                             self.found_type = Some(arg);
                             return; // we can stop visiting now
                         }
                     }
-                    Some(&rl::Region::Static) |
-                    Some(&rl::Region::EarlyBound(_, _)) |
-                    Some(&rl::Region::LateBound(_, _)) |
-                    Some(&rl::Region::Free(_, _)) |
+                    Some(rl::Region::Static) |
+                    Some(rl::Region::EarlyBound(_, _)) |
+                    Some(rl::Region::LateBound(_, _)) |
+                    Some(rl::Region::Free(_, _)) |
                     None => {
                         debug!("no arg found");
                     }
@@ -272,17 +273,18 @@ impl<'a, 'gcx, 'tcx> Visitor<'gcx> for TyPathVisitor<'a, 'gcx, 'tcx> {
             _ => return,
         };
 
-        match self.infcx.tcx.named_region_map.defs.get(&lifetime.id) {
+        let hir_id = self.infcx.tcx.hir.node_to_hir_id(lifetime.id);
+        match self.infcx.tcx.named_region(hir_id) {
             // the lifetime of the TyPath!
-            Some(&rl::Region::LateBoundAnon(debruijn_index, anon_index)) => {
+            Some(rl::Region::LateBoundAnon(debruijn_index, anon_index)) => {
                 if debruijn_index.depth == 1 && anon_index == br_index {
                     self.found_it = true;
                 }
             }
-            Some(&rl::Region::Static) |
-            Some(&rl::Region::EarlyBound(_, _)) |
-            Some(&rl::Region::LateBound(_, _)) |
-            Some(&rl::Region::Free(_, _)) |
+            Some(rl::Region::Static) |
+            Some(rl::Region::EarlyBound(_, _)) |
+            Some(rl::Region::LateBound(_, _)) |
+            Some(rl::Region::Free(_, _)) |
             None => {
                 debug!("no arg found");
             }