"on-demandify" privacy and access levels

src/librustc/dep_graph/dep_node.rs

@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+use hir::def_id::CrateNum;
 use std::fmt::Debug;
 use std::sync::Arc;
 
@@ -81,7 +82,7 @@ pub enum DepNode<D: Clone + Debug> {
     TypeckItemType(D),
     UnusedTraitCheck,
     CheckConst(D),
-    Privacy,
+    PrivacyAccessLevels(CrateNum),
     IntrinsicCheck(D),
     MatchCheck(D),
 
@@ -230,7 +231,7 @@ impl<D: Clone + Debug> DepNode<D> {
             CheckEntryFn => Some(CheckEntryFn),
             Variance => Some(Variance),
             UnusedTraitCheck => Some(UnusedTraitCheck),
-            Privacy => Some(Privacy),
+            PrivacyAccessLevels(k) => Some(PrivacyAccessLevels(k)),
             Reachability => Some(Reachability),
             DeadCheck => Some(DeadCheck),
             LateLintCheck => Some(LateLintCheck),

src/librustc/dep_graph/edges.rs

@@ -101,11 +101,15 @@ impl<D: Clone + Debug + Eq + Hash> DepGraphEdges<D> {
     }
 
     /// Indicates that the current task `C` reads `v` by adding an
-    /// edge from `v` to `C`. If there is no current task, panics. If
-    /// you want to suppress this edge, use `ignore`.
+    /// edge from `v` to `C`. If there is no current task, has no
+    /// effect. Note that *reading* from tracked state is harmless if
+    /// you are not in a task; what is bad is *writing* to tracked
+    /// state (and leaking data that you read into a tracked task).
     pub fn read(&mut self, v: DepNode<D>) {
-        let source = self.make_node(v);
-        self.add_edge_from_current_node(|current| (source, current))
+        if self.current_node().is_some() {
+            let source = self.make_node(v);
+            self.add_edge_from_current_node(|current| (source, current))
+        }
     }
 
     /// Indicates that the current task `C` writes `v` by adding an

src/librustc/dep_graph/shadow.rs

@@ -80,7 +80,13 @@ impl ShadowGraph {
 
             let mut stack = self.stack.borrow_mut();
             match *message {
-                DepMessage::Read(ref n) => self.check_edge(Some(Some(n)), top(&stack)),
+                // It is ok to READ shared state outside of a
+                // task. That can't do any harm (at least, the only
+                // way it can do harm is by leaking that data into a
+                // query or task, which would be a problem
+                // anyway). What would be bad is WRITING to that
+                // state.
+                DepMessage::Read(_) => { }
                 DepMessage::Write(ref n) => self.check_edge(top(&stack), Some(Some(n))),
                 DepMessage::PushTask(ref n) => stack.push(Some(n.clone())),
                 DepMessage::PushIgnore => stack.push(None),
@@ -116,7 +122,7 @@ impl ShadowGraph {
             (None, None) => unreachable!(),
 
             // nothing on top of the stack
-            (None, Some(n)) | (Some(n), None) => bug!("read/write of {:?} but no current task", n),
+            (None, Some(n)) | (Some(n), None) => bug!("write of {:?} but no current task", n),
 
             // this corresponds to an Ignore being top of the stack
             (Some(None), _) | (_, Some(None)) => (),

src/librustc/lint/context.rs

@@ -44,9 +44,10 @@ use std::ops::Deref;
 use syntax::attr;
 use syntax::ast;
 use syntax::symbol::Symbol;
-use syntax_pos::{MultiSpan, Span};
+use syntax_pos::{DUMMY_SP, MultiSpan, Span};
 use errors::{self, Diagnostic, DiagnosticBuilder};
 use hir;
+use hir::def_id::LOCAL_CRATE;
 use hir::intravisit as hir_visit;
 use syntax::visit as ast_visit;
 
@@ -1231,10 +1232,11 @@ fn check_lint_name_cmdline(sess: &Session, lint_cx: &LintStore,
 /// Perform lint checking on a crate.
 ///
 /// Consumes the `lint_store` field of the `Session`.
-pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
-                             access_levels: &AccessLevels) {
+pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
     let _task = tcx.dep_graph.in_task(DepNode::LateLintCheck);
 
+    let access_levels = &ty::queries::privacy_access_levels::get(tcx, DUMMY_SP, LOCAL_CRATE);
+
     let krate = tcx.hir.krate();
 
     // We want to own the lint store, so move it out of the session.

src/librustc/middle/cstore.rs

@@ -255,8 +255,8 @@ pub trait CrateStore {
     fn used_crates(&self, prefer: LinkagePreference) -> Vec<(CrateNum, LibSource)>;
     fn used_crate_source(&self, cnum: CrateNum) -> CrateSource;
     fn extern_mod_stmt_cnum(&self, emod_id: ast::NodeId) -> Option<CrateNum>;
-    fn encode_metadata<'a, 'tcx>(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>,
-                                 reexports: &def::ExportMap,
+    fn encode_metadata<'a, 'tcx>(&self,
+                                 tcx: TyCtxt<'a, 'tcx, 'tcx>,
                                  link_meta: &LinkMeta,
                                  reachable: &NodeSet) -> Vec<u8>;
     fn metadata_encoding_version(&self) -> &[u8];
@@ -412,10 +412,10 @@ impl CrateStore for DummyCrateStore {
         { vec![] }
     fn used_crate_source(&self, cnum: CrateNum) -> CrateSource { bug!("used_crate_source") }
     fn extern_mod_stmt_cnum(&self, emod_id: ast::NodeId) -> Option<CrateNum> { None }
-    fn encode_metadata<'a, 'tcx>(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>,
-                           reexports: &def::ExportMap,
-                           link_meta: &LinkMeta,
-                           reachable: &NodeSet) -> Vec<u8> { vec![] }
+    fn encode_metadata<'a, 'tcx>(&self,
+                                 tcx: TyCtxt<'a, 'tcx, 'tcx>,
+                                 link_meta: &LinkMeta,
+                                 reachable: &NodeSet) -> Vec<u8> { vec![] }
     fn metadata_encoding_version(&self) -> &[u8] { bug!("metadata_encoding_version") }
 }
 

src/librustc/middle/dead.rs

@@ -21,12 +21,13 @@ use hir::itemlikevisit::ItemLikeVisitor;
 use middle::privacy;
 use ty::{self, TyCtxt};
 use hir::def::Def;
-use hir::def_id::{DefId};
+use hir::def_id::{DefId, LOCAL_CRATE};
 use lint;
 use util::nodemap::FxHashSet;
 
 use syntax::{ast, codemap};
 use syntax::attr;
+use syntax::codemap::DUMMY_SP;
 use syntax_pos;
 
 // Any local node that may call something in its body block should be
@@ -592,9 +593,9 @@ impl<'a, 'tcx> Visitor<'tcx> for DeadVisitor<'a, 'tcx> {
     }
 }
 
-pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
-                             access_levels: &privacy::AccessLevels) {
+pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
     let _task = tcx.dep_graph.in_task(DepNode::DeadCheck);
+    let access_levels = &ty::queries::privacy_access_levels::get(tcx, DUMMY_SP, LOCAL_CRATE);
     let krate = tcx.hir.krate();
     let live_symbols = find_live(tcx, access_levels, krate);
     let mut visitor = DeadVisitor { tcx: tcx, live_symbols: live_symbols };

src/librustc/middle/reachable.rs

@@ -27,7 +27,9 @@ use util::nodemap::{NodeSet, FxHashSet};
 use syntax::abi::Abi;
 use syntax::ast;
 use syntax::attr;
+use syntax::codemap::DUMMY_SP;
 use hir;
+use hir::def_id::LOCAL_CRATE;
 use hir::intravisit::{Visitor, NestedVisitorMap};
 use hir::itemlikevisit::ItemLikeVisitor;
 use hir::intravisit;
@@ -359,11 +361,11 @@ impl<'a, 'tcx: 'a> ItemLikeVisitor<'tcx> for CollectPrivateImplItemsVisitor<'a,
     }
 }
 
-pub fn find_reachable<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
-                                access_levels: &privacy::AccessLevels)
-                                -> NodeSet {
+pub fn find_reachable<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> NodeSet {
     let _task = tcx.dep_graph.in_task(DepNode::Reachability);
 
+    let access_levels = &ty::queries::privacy_access_levels::get(tcx, DUMMY_SP, LOCAL_CRATE);
+
     let any_library = tcx.sess.crate_types.borrow().iter().any(|ty| {
         *ty == config::CrateTypeRlib || *ty == config::CrateTypeDylib ||
         *ty == config::CrateTypeProcMacro

src/librustc/middle/stability.rs

@@ -656,10 +656,11 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
 /// Given the list of enabled features that were not language features (i.e. that
 /// were expected to be library features), and the list of features used from
 /// libraries, identify activated features that don't exist and error about them.
-pub fn check_unused_or_stable_features<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
-                                                 access_levels: &AccessLevels) {
+pub fn check_unused_or_stable_features<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
     let sess = &tcx.sess;
 
+    let access_levels = &ty::queries::privacy_access_levels::get(tcx, DUMMY_SP, LOCAL_CRATE);
+
     if tcx.stability.borrow().staged_api[&LOCAL_CRATE] && tcx.sess.features.borrow().staged_api {
         let _task = tcx.dep_graph.in_task(DepNode::StabilityIndex);
         let krate = tcx.hir.krate();

src/librustc/ty/context.rs

@@ -15,7 +15,7 @@ use session::Session;
 use lint;
 use middle;
 use hir::TraitMap;
-use hir::def::Def;
+use hir::def::{Def, ExportMap};
 use hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
 use hir::map as hir_map;
 use hir::map::DisambiguatedDefPathData;
@@ -416,6 +416,9 @@ pub struct GlobalCtxt<'tcx> {
     /// is relevant; generated by resolve.
     pub trait_map: TraitMap,
 
+    /// Export map produced by name resolution.
+    pub export_map: ExportMap,
+
     pub named_region_map: resolve_lifetime::NamedRegionMap,
 
     pub region_maps: RegionMaps,
@@ -698,6 +701,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
             region_maps: region_maps,
             variance_computed: Cell::new(false),
             trait_map: resolutions.trait_map,
+            export_map: resolutions.export_map,
             fulfilled_predicates: RefCell::new(fulfilled_predicates),
             hir: hir,
             maps: maps::Maps::new(dep_graph, providers),

src/librustc/ty/maps.rs

@@ -11,6 +11,7 @@
 use dep_graph::{DepGraph, DepNode, DepTrackingMap, DepTrackingMapConfig};
 use hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
 use middle::const_val::ConstVal;
+use middle::privacy::AccessLevels;
 use mir;
 use ty::{self, Ty, TyCtxt};
 
@@ -189,6 +190,12 @@ impl<'tcx> QueryDescription for queries::mir_shims<'tcx> {
     }
 }
 
+impl<'tcx> QueryDescription for queries::privacy_access_levels<'tcx> {
+    fn describe(_: TyCtxt, _: CrateNum) -> String {
+        format!("privacy access levels")
+    }
+}
+
 macro_rules! define_maps {
     (<$tcx:tt>
      $($(#[$attr:meta])*
@@ -406,6 +413,9 @@ define_maps! { <'tcx>
     /// other items, such as enum variant explicit discriminants.
     pub monomorphic_const_eval: MonomorphicConstEval(DefId) -> Result<ConstVal<'tcx>, ()>,
 
+    /// Performs the privacy check and computes "access levels".
+    pub privacy_access_levels: PrivacyAccessLevels(CrateNum) -> Rc<AccessLevels>,
+
     pub mir_shims: mir_shim(ty::InstanceDef<'tcx>) -> &'tcx RefCell<mir::Mir<'tcx>>
 }
 

src/librustc/ty/mod.rs

@@ -17,11 +17,11 @@ pub use self::fold::TypeFoldable;
 
 use dep_graph::{self, DepNode};
 use hir::{map as hir_map, FreevarMap, TraitMap};
-use middle;
 use hir::def::{Def, CtorKind, ExportMap};
 use hir::def_id::{CrateNum, DefId, DefIndex, CRATE_DEF_INDEX, LOCAL_CRATE};
 use middle::const_val::ConstVal;
 use middle::lang_items::{FnTraitLangItem, FnMutTraitLangItem, FnOnceTraitLangItem};
+use middle::privacy::AccessLevels;
 use middle::region::{CodeExtent, ROOT_CODE_EXTENT};
 use middle::resolve_lifetime::ObjectLifetimeDefault;
 use mir::Mir;
@@ -108,10 +108,12 @@ mod sty;
 
 /// The complete set of all analyses described in this module. This is
 /// produced by the driver and fed to trans and later passes.
+///
+/// NB: These contents are being migrated into queries using the
+/// *on-demand* infrastructure.
 #[derive(Clone)]
 pub struct CrateAnalysis {
-    pub export_map: ExportMap,
-    pub access_levels: middle::privacy::AccessLevels,
+    pub access_levels: Rc<AccessLevels>,
     pub reachable: NodeSet,
     pub name: String,
     pub glob_map: Option<hir::GlobMap>,
@@ -122,6 +124,7 @@ pub struct Resolutions {
     pub freevars: FreevarMap,
     pub trait_map: TraitMap,
     pub maybe_unused_trait_imports: NodeSet,
+    pub export_map: ExportMap,
 }
 
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]

src/librustc_driver/driver.rs

@@ -48,6 +48,7 @@ use std::fs;
 use std::io::{self, Write};
 use std::iter;
 use std::path::{Path, PathBuf};
+use std::rc::Rc;
 use syntax::{ast, diagnostics, visit};
 use syntax::attr;
 use syntax::ext::base::ExtCtxt;
@@ -807,18 +808,18 @@ pub fn phase_2_configure_and_expand<F>(sess: &Session,
         expanded_crate: krate,
         defs: resolver.definitions,
         analysis: ty::CrateAnalysis {
-            export_map: resolver.export_map,
-            access_levels: AccessLevels::default(),
+            access_levels: Rc::new(AccessLevels::default()),
             reachable: NodeSet(),
             name: crate_name.to_string(),
             glob_map: if resolver.make_glob_map { Some(resolver.glob_map) } else { None },
         },
         resolutions: Resolutions {
             freevars: resolver.freevars,
+            export_map: resolver.export_map,
             trait_map: resolver.trait_map,
             maybe_unused_trait_imports: resolver.maybe_unused_trait_imports,
         },
-        hir_forest: hir_forest
+        hir_forest: hir_forest,
     })
 }
 
@@ -888,6 +889,7 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
 
     let mut local_providers = ty::maps::Providers::default();
     mir::provide(&mut local_providers);
+    rustc_privacy::provide(&mut local_providers);
     typeck::provide(&mut local_providers);
     ty::provide(&mut local_providers);
 
@@ -931,9 +933,7 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
              || consts::check_crate(tcx));
 
         analysis.access_levels =
-            time(time_passes, "privacy checking", || {
-                rustc_privacy::check_crate(tcx, &analysis.export_map)
-            });
+            time(time_passes, "privacy checking", || rustc_privacy::check_crate(tcx));
 
         time(time_passes,
              "intrinsic checking",
@@ -1000,19 +1000,15 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
         analysis.reachable =
             time(time_passes,
                  "reachability checking",
-                 || reachable::find_reachable(tcx, &analysis.access_levels));
+                 || reachable::find_reachable(tcx));
 
-        time(time_passes, "death checking", || {
-            middle::dead::check_crate(tcx, &analysis.access_levels);
-        });
+        time(time_passes, "death checking", || middle::dead::check_crate(tcx));
 
         time(time_passes, "unused lib feature checking", || {
-            stability::check_unused_or_stable_features(tcx, &analysis.access_levels)
+            stability::check_unused_or_stable_features(tcx)
         });
 
-        time(time_passes,
-             "lint checking",
-             || lint::check_crate(tcx, &analysis.access_levels));
+        time(time_passes, "lint checking", || lint::check_crate(tcx));
 
         // The above three passes generate errors w/o aborting
         if sess.err_count() > 0 {

src/librustc_metadata/cstore_impl.rs

@@ -496,12 +496,12 @@ impl CrateStore for cstore::CStore {
         self.do_extern_mod_stmt_cnum(emod_id)
     }
 
-    fn encode_metadata<'a, 'tcx>(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>,
-                                 reexports: &def::ExportMap,
+    fn encode_metadata<'a, 'tcx>(&self,
+                                 tcx: TyCtxt<'a, 'tcx, 'tcx>,
                                  link_meta: &LinkMeta,
                                  reachable: &NodeSet) -> Vec<u8>
     {
-        encoder::encode_metadata(tcx, self, reexports, link_meta, reachable)
+        encoder::encode_metadata(tcx, self, link_meta, reachable)
     }
 
     fn metadata_encoding_version(&self) -> &[u8]

src/librustc_metadata/encoder.rs

@@ -13,7 +13,6 @@ use index::Index;
 use schema::*;
 
 use rustc::middle::cstore::{LinkMeta, LinkagePreference, NativeLibrary};
-use rustc::hir::def;
 use rustc::hir::def_id::{CrateNum, CRATE_DEF_INDEX, DefIndex, DefId};
 use rustc::hir::map::definitions::DefPathTable;
 use rustc::middle::dependency_format::Linkage;
@@ -48,7 +47,6 @@ use super::index_builder::{FromId, IndexBuilder, Untracked};
 pub struct EncodeContext<'a, 'tcx: 'a> {
     opaque: opaque::Encoder<'a>,
     pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
-    reexports: &'a def::ExportMap,
     link_meta: &'a LinkMeta,
     cstore: &'a cstore::CStore,
     exported_symbols: &'a NodeSet,
@@ -306,7 +304,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         let def_id = tcx.hir.local_def_id(id);
 
         let data = ModData {
-            reexports: match self.reexports.get(&id) {
+            reexports: match tcx.export_map.get(&id) {
                 Some(exports) if *vis == hir::Public => self.lazy_seq_ref(exports),
                 _ => LazySeq::empty(),
             },
@@ -1423,7 +1421,6 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
 
 pub fn encode_metadata<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
                                  cstore: &cstore::CStore,
-                                 reexports: &def::ExportMap,
                                  link_meta: &LinkMeta,
                                  exported_symbols: &NodeSet)
                                  -> Vec<u8> {
@@ -1437,7 +1434,6 @@ pub fn encode_metadata<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
         let mut ecx = EncodeContext {
             opaque: opaque::Encoder::new(&mut cursor),
             tcx: tcx,
-            reexports: reexports,
             link_meta: link_meta,
             cstore: cstore,
             exported_symbols: exported_symbols,

src/librustc_privacy/lib.rs

@@ -17,6 +17,7 @@
       html_root_url = "https://doc.rust-lang.org/nightly/")]
 #![deny(warnings)]
 
+#![cfg_attr(stage0, feature(field_init_shorthand))]
 #![feature(rustc_diagnostic_macros)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
@@ -25,23 +26,24 @@ extern crate rustc;
 #[macro_use] extern crate syntax;
 extern crate syntax_pos;
 
-use rustc::dep_graph::DepNode;
 use rustc::hir::{self, PatKind};
-use rustc::hir::def::{self, Def};
-use rustc::hir::def_id::{CRATE_DEF_INDEX, DefId};
+use rustc::hir::def::Def;
+use rustc::hir::def_id::{CRATE_DEF_INDEX, LOCAL_CRATE, CrateNum, DefId};
 use rustc::hir::intravisit::{self, Visitor, NestedVisitorMap};
 use rustc::hir::itemlikevisit::DeepVisitor;
 use rustc::hir::pat_util::EnumerateAndAdjustIterator;
 use rustc::lint;
 use rustc::middle::privacy::{AccessLevel, AccessLevels};
 use rustc::ty::{self, TyCtxt, Ty, TypeFoldable};
 use rustc::ty::fold::TypeVisitor;
+use rustc::ty::maps::Providers;
 use rustc::util::nodemap::NodeSet;
 use syntax::ast;
-use syntax_pos::Span;
+use syntax_pos::{DUMMY_SP, Span};
 
 use std::cmp;
 use std::mem::replace;
+use std::rc::Rc;
 
 pub mod diagnostics;
 
@@ -71,7 +73,6 @@ impl<'a, 'tcx> Visitor<'tcx> for PubRestrictedVisitor<'a, 'tcx> {
 
 struct EmbargoVisitor<'a, 'tcx: 'a> {
     tcx: TyCtxt<'a, 'tcx, 'tcx>,
-    export_map: &'a def::ExportMap,
 
     // Accessibility levels for reachable nodes
     access_levels: AccessLevels,
@@ -324,7 +325,7 @@ impl<'a, 'tcx> Visitor<'tcx> for EmbargoVisitor<'a, 'tcx> {
         // This code is here instead of in visit_item so that the
         // crate module gets processed as well.
         if self.prev_level.is_some() {
-            if let Some(exports) = self.export_map.get(&id) {
+            if let Some(exports) = self.tcx.export_map.get(&id) {
                 for export in exports {
                     if let Some(node_id) = self.tcx.hir.as_local_node_id(export.def.def_id()) {
                         self.update(node_id, Some(AccessLevel::Exported));
@@ -1204,10 +1205,23 @@ impl<'a, 'tcx> Visitor<'tcx> for PrivateItemsInPublicInterfacesVisitor<'a, 'tcx>
     fn visit_pat(&mut self, _: &'tcx hir::Pat) {}
 }
 
-pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
-                             export_map: &def::ExportMap)
-                             -> AccessLevels {
-    let _task = tcx.dep_graph.in_task(DepNode::Privacy);
+pub fn provide(providers: &mut Providers) {
+    *providers = Providers {
+        privacy_access_levels,
+        ..*providers
+    };
+}
+
+pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Rc<AccessLevels> {
+    tcx.dep_graph.with_ignore(|| { // FIXME
+        ty::queries::privacy_access_levels::get(tcx, DUMMY_SP, LOCAL_CRATE)
+    })
+}
+
+fn privacy_access_levels<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
+                                   krate: CrateNum)
+                                   -> Rc<AccessLevels> {
+    assert_eq!(krate, LOCAL_CRATE);
 
     let krate = tcx.hir.krate();
 
@@ -1226,7 +1240,6 @@ pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     // items which are reachable from external crates based on visibility.
     let mut visitor = EmbargoVisitor {
         tcx: tcx,
-        export_map: export_map,
         access_levels: Default::default(),
         prev_level: Some(AccessLevel::Public),
         changed: false,
@@ -1270,7 +1283,7 @@ pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
         krate.visit_all_item_likes(&mut DeepVisitor::new(&mut visitor));
     }
 
-    visitor.access_levels
+    Rc::new(visitor.access_levels)
 }
 
 __build_diagnostic_array! { librustc_privacy, DIAGNOSTICS }

src/librustc_trans/base.rs

@@ -755,7 +755,6 @@ fn write_metadata(cx: &SharedCrateContext,
 
     let cstore = &cx.tcx().sess.cstore;
     let metadata = cstore.encode_metadata(cx.tcx(),
-                                          cx.export_map(),
                                           cx.link_meta(),
                                           exported_symbols);
     if kind == MetadataKind::Uncompressed {
@@ -1056,15 +1055,14 @@ pub fn trans_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     // particular items that will be processed.
     let krate = tcx.hir.krate();
 
-    let ty::CrateAnalysis { export_map, reachable, name, .. } = analysis;
+    let ty::CrateAnalysis { reachable, name, .. } = analysis;
     let exported_symbols = find_exported_symbols(tcx, reachable);
 
     let check_overflow = tcx.sess.overflow_checks();
 
     let link_meta = link::build_link_meta(incremental_hashes_map, &name);
 
     let shared_ccx = SharedCrateContext::new(tcx,
-                                             export_map,
                                              link_meta.clone(),
                                              exported_symbols,
                                              check_overflow);

src/librustc_trans/context.rs

@@ -14,7 +14,6 @@ use rustc::dep_graph::{DepGraph, DepGraphSafe, DepNode, DepTrackingMap,
                        DepTrackingMapConfig, WorkProduct};
 use middle::cstore::LinkMeta;
 use rustc::hir;
-use rustc::hir::def::ExportMap;
 use rustc::hir::def_id::DefId;
 use rustc::traits;
 use debuginfo;
@@ -68,7 +67,6 @@ pub struct SharedCrateContext<'a, 'tcx: 'a> {
     metadata_llmod: ModuleRef,
     metadata_llcx: ContextRef,
 
-    export_map: ExportMap,
     exported_symbols: NodeSet,
     link_meta: LinkMeta,
     tcx: TyCtxt<'a, 'tcx, 'tcx>,
@@ -402,7 +400,6 @@ unsafe fn create_context_and_module(sess: &Session, mod_name: &str) -> (ContextR
 
 impl<'b, 'tcx> SharedCrateContext<'b, 'tcx> {
     pub fn new(tcx: TyCtxt<'b, 'tcx, 'tcx>,
-               export_map: ExportMap,
                link_meta: LinkMeta,
                exported_symbols: NodeSet,
                check_overflow: bool)
@@ -459,7 +456,6 @@ impl<'b, 'tcx> SharedCrateContext<'b, 'tcx> {
         SharedCrateContext {
             metadata_llmod: metadata_llmod,
             metadata_llcx: metadata_llcx,
-            export_map: export_map,
             exported_symbols: exported_symbols,
             link_meta: link_meta,
             empty_param_env: tcx.empty_parameter_environment(),
@@ -499,10 +495,6 @@ impl<'b, 'tcx> SharedCrateContext<'b, 'tcx> {
         self.metadata_llcx
     }
 
-    pub fn export_map<'a>(&'a self) -> &'a ExportMap {
-        &self.export_map
-    }
-
     pub fn exported_symbols<'a>(&'a self) -> &'a NodeSet {
         &self.exported_symbols
     }
@@ -702,10 +694,6 @@ impl<'b, 'tcx> CrateContext<'b, 'tcx> {
         unsafe { llvm::LLVMRustGetModuleDataLayout(self.llmod()) }
     }
 
-    pub fn export_map<'a>(&'a self) -> &'a ExportMap {
-        &self.shared.export_map
-    }
-
     pub fn exported_symbols<'a>(&'a self) -> &'a NodeSet {
         &self.shared.exported_symbols
     }

src/librustdoc/core.rs

@@ -13,7 +13,7 @@ use rustc_driver::{driver, target_features, abort_on_err};
 use rustc::dep_graph::DepGraph;
 use rustc::session::{self, config};
 use rustc::hir::def_id::DefId;
-use rustc::hir::def::{Def, ExportMap};
+use rustc::hir::def::Def;
 use rustc::middle::privacy::AccessLevels;
 use rustc::ty::{self, TyCtxt, GlobalArenas};
 use rustc::hir::map as hir_map;
@@ -64,7 +64,6 @@ pub struct DocContext<'a, 'tcx: 'a> {
     pub ty_substs: RefCell<FxHashMap<Def, clean::Type>>,
     /// Table node id of lifetime parameter definition -> substituted lifetime
     pub lt_substs: RefCell<FxHashMap<ast::NodeId, clean::Lifetime>>,
-    pub export_map: ExportMap,
 }
 
 impl<'a, 'tcx> DocContext<'a, 'tcx> {
@@ -180,13 +179,13 @@ pub fn run_core(search_paths: SearchPaths,
             sess.fatal("Compilation failed, aborting rustdoc");
         }
 
-        let ty::CrateAnalysis { access_levels, export_map, .. } = analysis;
+        let ty::CrateAnalysis { access_levels, .. } = analysis;
 
         // Convert from a NodeId set to a DefId set since we don't always have easy access
         // to the map from defid -> nodeid
         let access_levels = AccessLevels {
-            map: access_levels.map.into_iter()
-                                  .map(|(k, v)| (tcx.hir.local_def_id(k), v))
+            map: access_levels.map.iter()
+                                  .map(|(&k, &v)| (tcx.hir.local_def_id(k), v))
                                   .collect()
         };
 
@@ -198,7 +197,6 @@ pub fn run_core(search_paths: SearchPaths,
             renderinfo: Default::default(),
             ty_substs: Default::default(),
             lt_substs: Default::default(),
-            export_map: export_map,
         };
         debug!("crate: {:?}", tcx.hir.krate());
 

src/librustdoc/visit_ast.rs

@@ -198,7 +198,7 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
             self.visit_item(item, None, &mut om);
         }
         self.inside_public_path = orig_inside_public_path;
-        if let Some(exports) = self.cx.export_map.get(&id) {
+        if let Some(exports) = self.cx.tcx.export_map.get(&id) {
             for export in exports {
                 if let Def::Macro(def_id, ..) = export.def {
                     if def_id.krate == LOCAL_CRATE {