rust-lang · michaelwoerister · Sep 5, 2017
diff --git a/src/librustc/hir/lowering.rs b/src/librustc/hir/lowering.rs
@@ -46,6 +46,7 @@ use hir::map::definitions::DefPathData;
 use hir::def_id::{DefIndex, DefId, CRATE_DEF_INDEX};
 use hir::def::{Def, PathResolution};
 use lint::builtin::PARENTHESIZED_PARAMS_IN_TYPES_AND_MODULES;
+use middle::cstore::CrateStore;
 use rustc_data_structures::indexed_vec::IndexVec;
 use session::Session;
 use util::common::FN_OUTPUT_NAME;
@@ -75,6 +76,8 @@ pub struct LoweringContext<'a> {
     // Use to assign ids to hir nodes that do not directly correspond to an ast node
     sess: &'a Session,
 
+    cstore: &'a CrateStore,
+
     // As we walk the AST we must keep track of the current 'parent' def id (in
     // the form of a DefIndex) so that if we create a new node which introduces
     // a definition, then we can properly create the def id.
@@ -119,6 +122,7 @@ pub trait Resolver {
 }
 
 pub fn lower_crate(sess: &Session,
+                   cstore: &CrateStore,
                    krate: &Crate,
                    resolver: &mut Resolver)
                    -> hir::Crate {
@@ -130,6 +134,7 @@ pub fn lower_crate(sess: &Session,
     LoweringContext {
         crate_root: std_inject::injected_crate_name(krate),
         sess,
+        cstore,
         parent_def: None,
         resolver,
         name_map: FxHashMap(),
@@ -535,7 +540,7 @@ impl<'a> LoweringContext<'a> {
         if id.is_local() {
             self.resolver.definitions().def_key(id.index)
         } else {
-            self.sess.cstore.def_key(id)
+            self.cstore.def_key(id)
         }
     }
 
@@ -787,7 +792,7 @@ 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.cstore.item_generics_cloned(def_id).regions.len();
                     self.type_def_lifetime_params.insert(def_id, n);
                     n
                 });

diff --git a/src/librustc/infer/error_reporting/mod.rs b/src/librustc/infer/error_reporting/mod.rs
@@ -357,7 +357,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
                 // for imported and non-imported crates
                 if exp_path == found_path
                 || exp_abs_path == found_abs_path {
-                    let crate_name = self.tcx.sess.cstore.crate_name(did1.krate);
+                    let crate_name = self.tcx.cstore().crate_name(did1.krate);
                     err.span_note(sp, &format!("Perhaps two different versions \
                                                 of crate `{}` are being used?",
                                                crate_name));

diff --git a/src/librustc/middle/dependency_format.rs b/src/librustc/middle/dependency_format.rs
@@ -66,7 +66,7 @@ use hir::def_id::CrateNum;
 use session;
 use session::config;
 use ty::TyCtxt;
-use middle::cstore::DepKind;
+use middle::cstore::{CrateStore, DepKind};
 use middle::cstore::LinkagePreference::{self, RequireStatic, RequireDynamic};
 use util::nodemap::FxHashMap;
 use rustc_back::PanicStrategy;
@@ -132,12 +132,12 @@ fn calculate_type<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
             if let Some(v) = attempt_static(tcx) {
                 return v;
             }
-            for cnum in sess.cstore.crates() {
-                if sess.cstore.dep_kind(cnum).macros_only() { continue }
-                let src = sess.cstore.used_crate_source(cnum);
+            for cnum in tcx.cstore().crates() {
+                if tcx.cstore().dep_kind(cnum).macros_only() { continue }
+                let src = tcx.cstore().used_crate_source(cnum);
                 if src.rlib.is_some() { continue }
                 sess.err(&format!("dependency `{}` not found in rlib format",
-                                  sess.cstore.crate_name(cnum)));
+                                  tcx.cstore().crate_name(cnum)));
             }
             return Vec::new();
         }
@@ -165,24 +165,24 @@ fn calculate_type<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     // Sweep all crates for found dylibs. Add all dylibs, as well as their
     // dependencies, ensuring there are no conflicts. The only valid case for a
     // dependency to be relied upon twice is for both cases to rely on a dylib.
-    for cnum in sess.cstore.crates() {
-        if sess.cstore.dep_kind(cnum).macros_only() { continue }
-        let name = sess.cstore.crate_name(cnum);
-        let src = sess.cstore.used_crate_source(cnum);
+    for cnum in tcx.cstore().crates() {
+        if tcx.cstore().dep_kind(cnum).macros_only() { continue }
+        let name = tcx.cstore().crate_name(cnum);
+        let src = tcx.cstore().used_crate_source(cnum);
         if src.dylib.is_some() {
             info!("adding dylib: {}", name);
-            add_library(sess, cnum, RequireDynamic, &mut formats);
+            add_library(sess, tcx.cstore(), cnum, RequireDynamic, &mut formats);
             let deps = tcx.dylib_dependency_formats(cnum.as_def_id());
             for &(depnum, style) in deps.iter() {
                 info!("adding {:?}: {}", style,
-                      sess.cstore.crate_name(depnum));
-                add_library(sess, depnum, style, &mut formats);
+                      tcx.cstore().crate_name(depnum));
+                add_library(sess, tcx.cstore(), depnum, style, &mut formats);
             }
         }
     }
 
     // Collect what we've got so far in the return vector.
-    let last_crate = sess.cstore.crates().len();
+    let last_crate = tcx.cstore().crates().len();
     let mut ret = (1..last_crate+1).map(|cnum| {
         match formats.get(&CrateNum::new(cnum)) {
             Some(&RequireDynamic) => Linkage::Dynamic,
@@ -196,14 +196,14 @@ fn calculate_type<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     //
     // If the crate hasn't been included yet and it's not actually required
     // (e.g. it's an allocator) then we skip it here as well.
-    for cnum in sess.cstore.crates() {
-        let src = sess.cstore.used_crate_source(cnum);
+    for cnum in tcx.cstore().crates() {
+        let src = tcx.cstore().used_crate_source(cnum);
         if src.dylib.is_none() &&
            !formats.contains_key(&cnum) &&
-           sess.cstore.dep_kind(cnum) == DepKind::Explicit {
+           tcx.cstore().dep_kind(cnum) == DepKind::Explicit {
             assert!(src.rlib.is_some() || src.rmeta.is_some());
-            info!("adding staticlib: {}", sess.cstore.crate_name(cnum));
-            add_library(sess, cnum, RequireStatic, &mut formats);
+            info!("adding staticlib: {}", tcx.cstore().crate_name(cnum));
+            add_library(sess, tcx.cstore(), cnum, RequireStatic, &mut formats);
             ret[cnum.as_usize() - 1] = Linkage::Static;
         }
     }
@@ -226,7 +226,7 @@ fn calculate_type<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     // making sure that everything is available in the requested format.
     for (cnum, kind) in ret.iter().enumerate() {
         let cnum = CrateNum::new(cnum + 1);
-        let src = sess.cstore.used_crate_source(cnum);
+        let src = tcx.cstore().used_crate_source(cnum);
         match *kind {
             Linkage::NotLinked |
             Linkage::IncludedFromDylib => {}
@@ -237,7 +237,7 @@ fn calculate_type<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
                     Linkage::Static => "rlib",
                     _ => "dylib",
                 };
-                let name = sess.cstore.crate_name(cnum);
+                let name = tcx.cstore().crate_name(cnum);
                 sess.err(&format!("crate `{}` required to be available in {}, \
                                   but it was not available in this form",
                                   name, kind));
@@ -249,6 +249,7 @@ fn calculate_type<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 }
 
 fn add_library(sess: &session::Session,
+               cstore: &CrateStore,
                cnum: CrateNum,
                link: LinkagePreference,
                m: &mut FxHashMap<CrateNum, LinkagePreference>) {
@@ -263,7 +264,7 @@ fn add_library(sess: &session::Session,
             // can be refined over time.
             if link2 != link || link == RequireStatic {
                 sess.struct_err(&format!("cannot satisfy dependencies so `{}` only \
-                                          shows up once", sess.cstore.crate_name(cnum)))
+                                          shows up once", cstore.crate_name(cnum)))
                     .help("having upstream crates all available in one format \
                            will likely make this go away")
                     .emit();
@@ -275,16 +276,16 @@ fn add_library(sess: &session::Session,
 
 fn attempt_static<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Option<DependencyList> {
     let sess = &tcx.sess;
-    let crates = sess.cstore.used_crates(RequireStatic);
+    let crates = tcx.cstore().used_crates(RequireStatic);
     if !crates.iter().by_ref().all(|&(_, ref p)| p.is_some()) {
         return None
     }
 
     // All crates are available in an rlib format, so we're just going to link
     // everything in explicitly so long as it's actually required.
-    let last_crate = sess.cstore.crates().len();
+    let last_crate = tcx.cstore().crates().len();
     let mut ret = (1..last_crate+1).map(|cnum| {
-        if sess.cstore.dep_kind(CrateNum::new(cnum)) == DepKind::Explicit {
+        if tcx.cstore().dep_kind(CrateNum::new(cnum)) == DepKind::Explicit {
             Linkage::Static
         } else {
             Linkage::NotLinked
@@ -357,13 +358,13 @@ fn verify_ok<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, list: &[Linkage]) {
 
         if tcx.is_panic_runtime(cnum.as_def_id()) {
             if let Some((prev, _)) = panic_runtime {
-                let prev_name = sess.cstore.crate_name(prev);
-                let cur_name = sess.cstore.crate_name(cnum);
+                let prev_name = tcx.cstore().crate_name(prev);
+                let cur_name = tcx.cstore().crate_name(cnum);
                 sess.err(&format!("cannot link together two \
                                    panic runtimes: {} and {}",
                                   prev_name, cur_name));
             }
-            panic_runtime = Some((cnum, sess.cstore.panic_strategy(cnum)));
+            panic_runtime = Some((cnum, tcx.cstore().panic_strategy(cnum)));
         }
     }
 
@@ -379,7 +380,7 @@ fn verify_ok<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, list: &[Linkage]) {
             sess.err(&format!("the linked panic runtime `{}` is \
                                not compiled with this crate's \
                                panic strategy `{}`",
-                              sess.cstore.crate_name(cnum),
+                              tcx.cstore().crate_name(cnum),
                               desired_strategy.desc()));
         }
 
@@ -395,8 +396,8 @@ fn verify_ok<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, list: &[Linkage]) {
                 continue
             }
             let cnum = CrateNum::new(i + 1);
-            let found_strategy = sess.cstore.panic_strategy(cnum);
-            let is_compiler_builtins = sess.cstore.is_compiler_builtins(cnum);
+            let found_strategy = tcx.cstore().panic_strategy(cnum);
+            let is_compiler_builtins = tcx.cstore().is_compiler_builtins(cnum);
             if is_compiler_builtins || desired_strategy == found_strategy {
                 continue
             }
@@ -405,7 +406,7 @@ fn verify_ok<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, list: &[Linkage]) {
                                panic strategy `{}` which is \
                                incompatible with this crate's \
                                strategy of `{}`",
-                              sess.cstore.crate_name(cnum),
+                              tcx.cstore().crate_name(cnum),
                               found_strategy.desc(),
                               desired_strategy.desc()));
         }

diff --git a/src/librustc/middle/lang_items.rs b/src/librustc/middle/lang_items.rs
@@ -25,6 +25,7 @@ use hir::map as hir_map;
 use session::Session;
 use hir::def_id::DefId;
 use ty;
+use middle::cstore::CrateStore;
 use middle::weak_lang_items;
 use util::nodemap::FxHashMap;
 
@@ -115,11 +116,9 @@ impl LanguageItems {
 
 struct LanguageItemCollector<'a, 'tcx: 'a> {
     items: LanguageItems,
-
     hir_map: &'a hir_map::Map<'tcx>,
-
     session: &'a Session,
-
+    cstore: &'a CrateStore,
     item_refs: FxHashMap<&'static str, usize>,
 }
 
@@ -149,14 +148,17 @@ impl<'a, 'v, 'tcx> ItemLikeVisitor<'v> for LanguageItemCollector<'a, 'tcx> {
 }
 
 impl<'a, 'tcx> LanguageItemCollector<'a, 'tcx> {
-    pub fn new(session: &'a Session, hir_map: &'a hir_map::Map<'tcx>)
+    pub fn new(session: &'a Session,
+               cstore: &'a CrateStore,
+               hir_map: &'a hir_map::Map<'tcx>)
                -> LanguageItemCollector<'a, 'tcx> {
         let mut item_refs = FxHashMap();
 
         $( item_refs.insert($name, $variant as usize); )*
 
         LanguageItemCollector {
             session,
+            cstore,
             hir_map,
             items: LanguageItems::new(),
             item_refs,
@@ -168,7 +170,7 @@ impl<'a, 'tcx> LanguageItemCollector<'a, 'tcx> {
         // Check for duplicates.
         match self.items.items[item_index] {
             Some(original_def_id) if original_def_id != item_def_id => {
-                let cstore = &self.session.cstore;
+                let cstore = self.cstore;
                 let name = LanguageItems::item_name(item_index);
                 let mut err = match self.hir_map.span_if_local(item_def_id) {
                     Some(span) => struct_span_err!(
@@ -205,10 +207,8 @@ impl<'a, 'tcx> LanguageItemCollector<'a, 'tcx> {
     }
 
     pub fn collect_external_language_items(&mut self) {
-        let cstore = &self.session.cstore;
-
-        for cnum in cstore.crates() {
-            for (index, item_index) in cstore.lang_items(cnum) {
+        for cnum in self.cstore.crates() {
+            for (index, item_index) in self.cstore.lang_items(cnum) {
                 let def_id = DefId { krate: cnum, index: index };
                 self.collect_item(item_index, def_id);
             }
@@ -234,13 +234,14 @@ pub fn extract(attrs: &[ast::Attribute]) -> Option<Symbol> {
 }
 
 pub fn collect_language_items(session: &Session,
+                              cstore: &CrateStore,
                               map: &hir_map::Map)
                               -> LanguageItems {
     let krate: &hir::Crate = map.krate();
-    let mut collector = LanguageItemCollector::new(session, map);
+    let mut collector = LanguageItemCollector::new(session, cstore, map);
     collector.collect(krate);
     let LanguageItemCollector { mut items, .. } = collector;
-    weak_lang_items::check_crate(krate, session, &mut items);
+    weak_lang_items::check_crate(krate, session, cstore, &mut items);
     items
 }
 

diff --git a/src/librustc/middle/resolve_lifetime.rs b/src/librustc/middle/resolve_lifetime.rs
@@ -16,9 +16,10 @@
 //! way. Therefore we break lifetime name resolution into a separate pass.
 
 use hir::map::Map;
-use session::Session;
 use hir::def::Def;
 use hir::def_id::DefId;
+use middle::cstore::CrateStore;
+use session::Session;
 use ty;
 
 use std::cell::Cell;
@@ -160,6 +161,7 @@ pub struct NamedRegionMap {
 
 struct LifetimeContext<'a, 'tcx: 'a> {
     sess: &'a Session,
+    cstore: &'a CrateStore,
     hir_map: &'a Map<'tcx>,
     map: &'a mut NamedRegionMap,
     scope: ScopeRef<'a>,
@@ -251,6 +253,7 @@ type ScopeRef<'a> = &'a Scope<'a>;
 const ROOT_SCOPE: ScopeRef<'static> = &Scope::Root;
 
 pub fn krate(sess: &Session,
+             cstore: &CrateStore,
              hir_map: &Map)
              -> Result<NamedRegionMap, ErrorReported> {
     let krate = hir_map.krate();
@@ -262,6 +265,7 @@ pub fn krate(sess: &Session,
     sess.track_errors(|| {
         let mut visitor = LifetimeContext {
             sess,
+            cstore,
             hir_map,
             map: &mut map,
             scope: ROOT_SCOPE,
@@ -765,12 +769,13 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
     fn with<F>(&mut self, wrap_scope: Scope, f: F) where
         F: for<'b> FnOnce(ScopeRef, &mut LifetimeContext<'b, 'tcx>),
     {
-        let LifetimeContext {sess, hir_map, ref mut map, ..} = *self;
+        let LifetimeContext {sess, cstore, hir_map, ref mut map, ..} = *self;
         let labels_in_fn = replace(&mut self.labels_in_fn, vec![]);
         let xcrate_object_lifetime_defaults =
             replace(&mut self.xcrate_object_lifetime_defaults, DefIdMap());
         let mut this = LifetimeContext {
             sess,
+            cstore,
             hir_map,
             map: *map,
             scope: &wrap_scope,
@@ -932,7 +937,7 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
             let def_key = if def_id.is_local() {
                 this.hir_map.def_key(def_id)
             } else {
-                this.sess.cstore.def_key(def_id)
+                this.cstore.def_key(def_id)
             };
             DefId {
                 krate: def_id.krate,
@@ -976,7 +981,7 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
             let unsubst = if let Some(id) = self.hir_map.as_local_node_id(def_id) {
                 &map.object_lifetime_defaults[&id]
             } else {
-                let cstore = &self.sess.cstore;
+                let cstore = self.cstore;
                 self.xcrate_object_lifetime_defaults.entry(def_id).or_insert_with(|| {
                     cstore.item_generics_cloned(def_id).types.into_iter().map(|def| {
                         def.object_lifetime_default