convert privacy access levels into a query

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/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/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/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;
@@ -108,9 +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 access_levels: middle::privacy::AccessLevels,
+    pub access_levels: Rc<AccessLevels>,
     pub reachable: NodeSet,
     pub name: String,
     pub glob_map: Option<hir::GlobMap>,

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;
@@ -807,7 +808,7 @@ pub fn phase_2_configure_and_expand<F>(sess: &Session,
         expanded_crate: krate,
         defs: resolver.definitions,
         analysis: ty::CrateAnalysis {
-            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 },
@@ -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)
-            });
+            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_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)]
@@ -25,10 +26,9 @@ 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::Def;
-use rustc::hir::def_id::{CRATE_DEF_INDEX, DefId};
+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;
@@ -36,12 +36,14 @@ 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;
 
@@ -1203,8 +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>) -> 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();
 
@@ -1266,7 +1283,7 @@ pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> AccessLevels {
         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/librustdoc/core.rs

@@ -184,8 +184,8 @@ pub fn run_core(search_paths: SearchPaths,
         // 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()
         };