Make more passes incremental

src/librustc/dep_graph/dep_node.rs

@@ -472,6 +472,12 @@ define_dep_nodes!( <'tcx>
     [] UnsafetyCheckResult(DefId),
     [] UnsafeDeriveOnReprPacked(DefId),
 
+    [] CheckModAttrs(DefId),
+    [] CheckModLoops(DefId),
+    [] CheckModUnstableApiUsage(DefId),
+    [] CheckModItemTypes(DefId),
+    [] CollectModItemTypes(DefId),
+
     [] Reachability,
     [] MirKeys,
     [eval_always] CrateVariances,

src/librustc/hir/check_attr.rs

@@ -4,9 +4,14 @@
 //! conflicts between multiple such attributes attached to the same
 //! item.
 
+
+use ty::TyCtxt;
+use ty::query::Providers;
+use ty::query::queries;
+
 use hir;
+use hir::def_id::DefId;
 use hir::intravisit::{self, Visitor, NestedVisitorMap};
-use ty::TyCtxt;
 use std::fmt::{self, Display};
 use syntax_pos::Span;
 
@@ -364,8 +369,9 @@ impl<'a, 'tcx> Visitor<'tcx> for CheckAttrVisitor<'a, 'tcx> {
 }
 
 pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
-    let mut checker = CheckAttrVisitor { tcx };
-    tcx.hir().krate().visit_all_item_likes(&mut checker.as_deep_visitor());
+    for &module in tcx.hir().krate().modules.keys() {
+        queries::check_mod_attrs::ensure(tcx, tcx.hir().local_def_id(module));
+    }
 }
 
 fn is_c_like_enum(item: &hir::Item) -> bool {
@@ -381,3 +387,17 @@ fn is_c_like_enum(item: &hir::Item) -> bool {
         false
     }
 }
+
+pub fn check_mod_attrs<'tcx>(tcx: TyCtxt<'_, 'tcx, 'tcx>, module_def_id: DefId) {
+    tcx.hir().visit_module_item_likes(
+        module_def_id,
+        &mut CheckAttrVisitor { tcx }.as_deep_visitor()
+    );
+}
+
+pub(crate) fn provide(providers: &mut Providers<'_>) {
+    *providers = Providers {
+        check_mod_attrs,
+        ..*providers
+    };
+}

src/librustc/hir/def_id.rs

@@ -1,4 +1,5 @@
 use ty;
+use ty::TyCtxt;
 use hir::map::definitions::FIRST_FREE_HIGH_DEF_INDEX;
 use rustc_data_structures::indexed_vec::Idx;
 use serialize;
@@ -247,6 +248,14 @@ impl DefId {
     pub fn to_local(self) -> LocalDefId {
         LocalDefId::from_def_id(self)
     }
+
+    pub fn describe_as_module(&self, tcx: TyCtxt<'_, '_, '_>) -> String {
+        if self.is_local() && self.index == CRATE_DEF_INDEX {
+            format!("top-level module")
+        } else {
+            format!("module `{}`", tcx.item_path_str(*self))
+        }
+    }
 }
 
 impl serialize::UseSpecializedEncodable for DefId {}

src/librustc/hir/lowering.rs

@@ -48,7 +48,7 @@ use session::config::nightly_options;
 use util::common::FN_OUTPUT_NAME;
 use util::nodemap::{DefIdMap, NodeMap};
 
-use std::collections::BTreeMap;
+use std::collections::{BTreeSet, BTreeMap};
 use std::fmt::Debug;
 use std::mem;
 use smallvec::SmallVec;
@@ -90,6 +90,8 @@ pub struct LoweringContext<'a> {
     trait_impls: BTreeMap<DefId, Vec<NodeId>>,
     trait_auto_impl: BTreeMap<DefId, NodeId>,
 
+    modules: BTreeMap<NodeId, hir::ModuleItems>,
+
     is_generator: bool,
 
     catch_scopes: Vec<NodeId>,
@@ -124,6 +126,8 @@ pub struct LoweringContext<'a> {
     // needs to be created for it.
     in_scope_lifetimes: Vec<Ident>,
 
+    current_module: NodeId,
+
     type_def_lifetime_params: DefIdMap<usize>,
 
     current_hir_id_owner: Vec<(DefIndex, u32)>,
@@ -228,12 +232,14 @@ pub fn lower_crate(
         bodies: BTreeMap::new(),
         trait_impls: BTreeMap::new(),
         trait_auto_impl: BTreeMap::new(),
+        modules: BTreeMap::new(),
         exported_macros: Vec::new(),
         catch_scopes: Vec::new(),
         loop_scopes: Vec::new(),
         is_in_loop_condition: false,
         anonymous_lifetime_mode: AnonymousLifetimeMode::PassThrough,
         type_def_lifetime_params: Default::default(),
+        current_module: CRATE_NODE_ID,
         current_hir_id_owner: vec![(CRATE_DEF_INDEX, 0)],
         item_local_id_counters: Default::default(),
         node_id_to_hir_id: IndexVec::new(),
@@ -356,6 +362,15 @@ impl<'a> LoweringContext<'a> {
         }
 
         impl<'lcx, 'interner> Visitor<'lcx> for MiscCollector<'lcx, 'interner> {
+            fn visit_mod(&mut self, m: &'lcx Mod, _s: Span, _attrs: &[Attribute], n: NodeId) {
+                self.lctx.modules.insert(n, hir::ModuleItems {
+                    items: BTreeSet::new(),
+                    trait_items: BTreeSet::new(),
+                    impl_items: BTreeSet::new(),
+                });
+                visit::walk_mod(self, m);
+            }
+
             fn visit_item(&mut self, item: &'lcx Item) {
                 self.lctx.allocate_hir_id_counter(item.id, item);
 
@@ -414,11 +429,18 @@ impl<'a> LoweringContext<'a> {
         }
 
         impl<'lcx, 'interner> Visitor<'lcx> for ItemLowerer<'lcx, 'interner> {
+            fn visit_mod(&mut self, m: &'lcx Mod, _s: Span, _attrs: &[Attribute], n: NodeId) {
+                let old = self.lctx.current_module;
+                self.lctx.current_module = n;
+                visit::walk_mod(self, m);
+                self.lctx.current_module = old;
+            }
+
             fn visit_item(&mut self, item: &'lcx Item) {
                 let mut item_lowered = true;
                 self.lctx.with_hir_id_owner(item.id, |lctx| {
                     if let Some(hir_item) = lctx.lower_item(item) {
-                        lctx.items.insert(item.id, hir_item);
+                        lctx.insert_item(item.id, hir_item);
                     } else {
                         item_lowered = false;
                     }
@@ -451,6 +473,7 @@ impl<'a> LoweringContext<'a> {
                     let id = hir::TraitItemId { node_id: item.id };
                     let hir_item = lctx.lower_trait_item(item);
                     lctx.trait_items.insert(id, hir_item);
+                    lctx.modules.get_mut(&lctx.current_module).unwrap().trait_items.insert(id);
                 });
 
                 visit::walk_trait_item(self, item);
@@ -461,6 +484,7 @@ impl<'a> LoweringContext<'a> {
                     let id = hir::ImplItemId { node_id: item.id };
                     let hir_item = lctx.lower_impl_item(item);
                     lctx.impl_items.insert(id, hir_item);
+                    lctx.modules.get_mut(&lctx.current_module).unwrap().impl_items.insert(id);
                 });
                 visit::walk_impl_item(self, item);
             }
@@ -492,9 +516,15 @@ impl<'a> LoweringContext<'a> {
             body_ids,
             trait_impls: self.trait_impls,
             trait_auto_impl: self.trait_auto_impl,
+            modules: self.modules,
         }
     }
 
+    fn insert_item(&mut self, id: NodeId, item: hir::Item) {
+        self.items.insert(id, item);
+        self.modules.get_mut(&self.current_module).unwrap().items.insert(id);
+    }
+
     fn allocate_hir_id_counter<T: Debug>(&mut self, owner: NodeId, debug: &T) -> LoweredNodeId {
         if self.item_local_id_counters.insert(owner, 0).is_some() {
             bug!(
@@ -1370,7 +1400,7 @@ impl<'a> LoweringContext<'a> {
             // Insert the item into the global list. This usually happens
             // automatically for all AST items. But this existential type item
             // does not actually exist in the AST.
-            lctx.items.insert(exist_ty_id.node_id, exist_ty_item);
+            lctx.insert_item(exist_ty_id.node_id, exist_ty_item);
 
             // `impl Trait` now just becomes `Foo<'a, 'b, ..>`.
             hir::TyKind::Def(hir::ItemId { id: exist_ty_id.node_id }, lifetimes)
@@ -3026,7 +3056,7 @@ impl<'a> LoweringContext<'a> {
                         };
                         let vis = respan(vis.span, vis_kind);
 
-                        this.items.insert(
+                        this.insert_item(
                             new_id.node_id,
                             hir::Item {
                                 id: new_id.node_id,
@@ -3133,7 +3163,7 @@ impl<'a> LoweringContext<'a> {
                         };
                         let vis = respan(vis.span, vis_kind);
 
-                        this.items.insert(
+                        this.insert_item(
                             new_id,
                             hir::Item {
                                 id: new_id,

src/librustc/hir/map/collector.rs

@@ -119,6 +119,7 @@ impl<'a, 'hir> NodeCollector<'a, 'hir> {
                 trait_impls: _,
                 trait_auto_impl: _,
                 body_ids: _,
+                modules: _,
             } = *krate;
 
             alloc_hir_dep_nodes(

src/librustc/hir/map/mod.rs

@@ -17,6 +17,7 @@ use syntax::ext::base::MacroKind;
 use syntax_pos::{Span, DUMMY_SP};
 
 use hir::*;
+use hir::itemlikevisit::ItemLikeVisitor;
 use hir::print::Nested;
 use util::nodemap::FxHashMap;
 
@@ -506,6 +507,35 @@ impl<'hir> Map<'hir> {
         &self.forest.krate.attrs
     }
 
+    pub fn visit_module_item_likes<V>(&self, module: DefId, visitor: &mut V)
+        where V: ItemLikeVisitor<'hir>
+    {
+        let node_id = self.as_local_node_id(module).unwrap();
+
+        // Read the module so we'll be re-executed if new items
+        // appear immediately under in the module. If some new item appears
+        // in some nested item in the module, we'll be re-executed due to the reads
+        // in the loops below
+        self.read(node_id);
+
+        let module = &self.forest.krate.modules[&node_id];
+
+        for id in &module.items {
+            self.read(*id);
+            visitor.visit_item(&self.forest.krate.items[id]);
+        }
+
+        for id in &module.trait_items {
+            self.read(id.node_id);
+            visitor.visit_trait_item(&self.forest.krate.trait_items[id]);
+        }
+
+        for id in &module.impl_items {
+            self.read(id.node_id);
+            visitor.visit_impl_item(&self.forest.krate.impl_items[id]);
+        }
+    }
+
     /// Retrieve the Node corresponding to `id`, panicking if it cannot
     /// be found.
     pub fn get(&self, id: NodeId) -> Node<'hir> {

src/librustc/hir/mod.rs

@@ -33,7 +33,7 @@ use rustc_data_structures::sync::{ParallelIterator, par_iter, Send, Sync, scope}
 use rustc_data_structures::thin_vec::ThinVec;
 
 use serialize::{self, Encoder, Encodable, Decoder, Decodable};
-use std::collections::BTreeMap;
+use std::collections::{BTreeSet, BTreeMap};
 use std::fmt;
 
 /// HIR doesn't commit to a concrete storage type and has its own alias for a vector.
@@ -676,6 +676,15 @@ pub struct WhereEqPredicate {
     pub rhs_ty: P<Ty>,
 }
 
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
+pub struct ModuleItems {
+    // Use BTreeSets here so items are in the same order as in the
+    // list of all items in Crate
+    pub items: BTreeSet<NodeId>,
+    pub trait_items: BTreeSet<TraitItemId>,
+    pub impl_items: BTreeSet<ImplItemId>,
+}
+
 /// The top-level data structure that stores the entire contents of
 /// the crate currently being compiled.
 ///
@@ -708,6 +717,10 @@ pub struct Crate {
     /// in the crate, you should iterate over this list rather than the keys
     /// of bodies.
     pub body_ids: Vec<BodyId>,
+
+    /// A list of modules written out in the order in which they
+    /// appear in the crate. This includes the main crate module.
+    pub modules: BTreeMap<NodeId, ModuleItems>,
 }
 
 impl Crate {
@@ -2408,6 +2421,7 @@ pub type GlobMap = NodeMap<FxHashSet<Name>>;
 
 
 pub fn provide(providers: &mut Providers<'_>) {
+    check_attr::provide(providers);
     providers.describe_def = map::describe_def;
 }
 

src/librustc/middle/stability.rs

@@ -8,6 +8,8 @@ use hir::{self, Item, Generics, StructField, Variant, HirId};
 use hir::def::Def;
 use hir::def_id::{CrateNum, CRATE_DEF_INDEX, DefId, LOCAL_CRATE};
 use hir::intravisit::{self, Visitor, NestedVisitorMap};
+use ty::query::Providers;
+use ty::query::queries;
 use middle::privacy::AccessLevels;
 use session::{DiagnosticMessageId, Session};
 use syntax::symbol::Symbol;
@@ -454,11 +456,23 @@ impl<'a, 'tcx> Index<'tcx> {
     }
 }
 
+pub fn check_unstable_api_usage<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
+    for &module in tcx.hir().krate().modules.keys() {
+        queries::check_mod_unstable_api_usage::ensure(tcx, tcx.hir().local_def_id(module));
+    }
+}
+
 /// Cross-references the feature names of unstable APIs with enabled
 /// features and possibly prints errors.
-pub fn check_unstable_api_usage<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
-    let mut checker = Checker { tcx };
-    tcx.hir().krate().visit_all_item_likes(&mut checker.as_deep_visitor());
+pub fn check_mod_unstable_api_usage<'tcx>(tcx: TyCtxt<'_, 'tcx, 'tcx>, module_def_id: DefId) {
+    tcx.hir().visit_module_item_likes(module_def_id, &mut Checker { tcx }.as_deep_visitor());
+}
+
+pub fn provide(providers: &mut Providers<'_>) {
+    *providers = Providers {
+        check_mod_unstable_api_usage,
+        ..*providers
+    };
 }
 
 /// Check whether an item marked with `deprecated(since="X")` is currently