just take `tcx` where we can

The more we can things dependent on just tcx, the easier it will
be to make queries etc later on.

src/librustc_trans/back/symbol_export.rs

@@ -53,7 +53,7 @@ pub fn compute_from<'a, 'tcx>(scx: &SharedCrateContext<'a, 'tcx>,
                 scx.tcx().hir.local_def_id(node_id)
             })
             .map(|def_id| {
-                let name = symbol_for_def_id(scx, def_id, symbol_map);
+                let name = symbol_for_def_id(scx.tcx(), def_id, symbol_map);
                 let export_level = export_level(scx, def_id);
                 debug!("EXPORTED SYMBOL (local): {} ({:?})", name, export_level);
                 (name, export_level)
@@ -108,7 +108,7 @@ pub fn compute_from<'a, 'tcx>(scx: &SharedCrateContext<'a, 'tcx>,
                 .exported_symbols(cnum)
                 .iter()
                 .map(|&def_id| {
-                    let name = symbol_name(Instance::mono(scx.tcx(), def_id), scx);
+                    let name = symbol_name(Instance::mono(scx.tcx(), def_id), scx.tcx());
                     let export_level = if special_runtime_crate {
                         // We can probably do better here by just ensuring that
                         // it has hidden visibility rather than public
@@ -214,21 +214,21 @@ pub fn is_below_threshold(level: SymbolExportLevel,
     }
 }
 
-fn symbol_for_def_id<'a, 'tcx>(scx: &SharedCrateContext<'a, 'tcx>,
+fn symbol_for_def_id<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
                                def_id: DefId,
                                symbol_map: &SymbolMap<'tcx>)
                                -> String {
     // Just try to look things up in the symbol map. If nothing's there, we
     // recompute.
-    if let Some(node_id) = scx.tcx().hir.as_local_node_id(def_id) {
+    if let Some(node_id) = tcx.hir.as_local_node_id(def_id) {
         if let Some(sym) = symbol_map.get(TransItem::Static(node_id)) {
             return sym.to_owned();
         }
     }
 
-    let instance = Instance::mono(scx.tcx(), def_id);
+    let instance = Instance::mono(tcx, def_id);
 
     symbol_map.get(TransItem::Fn(instance))
               .map(str::to_owned)
-              .unwrap_or_else(|| symbol_name(instance, scx))
+              .unwrap_or_else(|| symbol_name(instance, tcx))
 }

src/librustc_trans/back/symbol_names.rs

@@ -97,13 +97,12 @@
 //! virtually impossible. Thus, symbol hash generation exclusively relies on
 //! DefPaths which are much more robust in the face of changes to the code base.
 
-use common::SharedCrateContext;
 use monomorphize::Instance;
 
 use rustc::middle::weak_lang_items;
 use rustc::hir::def_id::DefId;
 use rustc::hir::map as hir_map;
-use rustc::ty::{self, Ty, TypeFoldable};
+use rustc::ty::{self, Ty, TyCtxt, TypeFoldable};
 use rustc::ty::fold::TypeVisitor;
 use rustc::ty::item_path::{self, ItemPathBuffer, RootMode};
 use rustc::ty::subst::Substs;
@@ -113,7 +112,7 @@
 use syntax::attr;
 use syntax::symbol::{Symbol, InternedString};
 
-fn get_symbol_hash<'a, 'tcx>(scx: &SharedCrateContext<'a, 'tcx>,
+fn get_symbol_hash<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 
                              // the DefId of the item this name is for
                              def_id: Option<DefId>,
@@ -130,8 +129,6 @@ fn get_symbol_hash<'a, 'tcx>(scx: &SharedCrateContext<'a, 'tcx>,
                              -> String {
     debug!("get_symbol_hash(def_id={:?}, parameters={:?})", def_id, substs);
 
-    let tcx = scx.tcx();
-
     let mut hasher = ty::util::TypeIdHasher::<u64>::new(tcx);
 
     record_time(&tcx.sess.perf_stats.symbol_hash_time, || {
@@ -157,8 +154,8 @@ fn get_symbol_hash<'a, 'tcx>(scx: &SharedCrateContext<'a, 'tcx>,
             // in case the same instances is emitted in two crates of the same
             // project.
             if substs.types().next().is_some() {
-                hasher.hash(scx.tcx().crate_name.as_str());
-                hasher.hash(scx.sess().local_crate_disambiguator().as_str());
+                hasher.hash(tcx.crate_name.as_str());
+                hasher.hash(tcx.sess.local_crate_disambiguator().as_str());
             }
         }
     });
@@ -168,37 +165,37 @@ fn get_symbol_hash<'a, 'tcx>(scx: &SharedCrateContext<'a, 'tcx>,
 }
 
 pub fn symbol_name<'a, 'tcx>(instance: Instance<'tcx>,
-                             scx: &SharedCrateContext<'a, 'tcx>) -> String {
+                             tcx: TyCtxt<'a, 'tcx, 'tcx>) -> String {
     let def_id = instance.def_id();
     let substs = instance.substs;
 
     debug!("symbol_name(def_id={:?}, substs={:?})",
            def_id, substs);
 
-    let node_id = scx.tcx().hir.as_local_node_id(def_id);
+    let node_id = tcx.hir.as_local_node_id(def_id);
 
     if let Some(id) = node_id {
-        if scx.sess().plugin_registrar_fn.get() == Some(id) {
+        if tcx.sess.plugin_registrar_fn.get() == Some(id) {
             let idx = def_id.index;
-            let disambiguator = scx.sess().local_crate_disambiguator();
-            return scx.sess().generate_plugin_registrar_symbol(disambiguator, idx);
+            let disambiguator = tcx.sess.local_crate_disambiguator();
+            return tcx.sess.generate_plugin_registrar_symbol(disambiguator, idx);
         }
-        if scx.sess().derive_registrar_fn.get() == Some(id) {
+        if tcx.sess.derive_registrar_fn.get() == Some(id) {
             let idx = def_id.index;
-            let disambiguator = scx.sess().local_crate_disambiguator();
-            return scx.sess().generate_derive_registrar_symbol(disambiguator, idx);
+            let disambiguator = tcx.sess.local_crate_disambiguator();
+            return tcx.sess.generate_derive_registrar_symbol(disambiguator, idx);
         }
     }
 
     // FIXME(eddyb) Precompute a custom symbol name based on attributes.
-    let attrs = scx.tcx().get_attrs(def_id);
+    let attrs = tcx.get_attrs(def_id);
     let is_foreign = if let Some(id) = node_id {
-        match scx.tcx().hir.get(id) {
+        match tcx.hir.get(id) {
             hir_map::NodeForeignItem(_) => true,
             _ => false
         }
     } else {
-        scx.sess().cstore.is_foreign_item(def_id)
+        tcx.sess.cstore.is_foreign_item(def_id)
     };
 
     if let Some(name) = weak_lang_items::link_name(&attrs) {
@@ -210,17 +207,17 @@ pub fn symbol_name<'a, 'tcx>(instance: Instance<'tcx>,
             return name.to_string();
         }
         // Don't mangle foreign items.
-        return scx.tcx().item_name(def_id).as_str().to_string();
+        return tcx.item_name(def_id).as_str().to_string();
     }
 
-    if let Some(name) = attr::find_export_name_attr(scx.sess().diagnostic(), &attrs) {
+    if let Some(name) = attr::find_export_name_attr(tcx.sess.diagnostic(), &attrs) {
         // Use provided name
         return name.to_string();
     }
 
     if attr::contains_name(&attrs, "no_mangle") {
         // Don't mangle
-        return scx.tcx().item_name(def_id).as_str().to_string();
+        return tcx.item_name(def_id).as_str().to_string();
     }
 
     // We want to compute the "type" of this item. Unfortunately, some
@@ -230,11 +227,11 @@ pub fn symbol_name<'a, 'tcx>(instance: Instance<'tcx>,
     let mut ty_def_id = def_id;
     let instance_ty;
     loop {
-        let key = scx.tcx().def_key(ty_def_id);
+        let key = tcx.def_key(ty_def_id);
         match key.disambiguated_data.data {
             DefPathData::TypeNs(_) |
             DefPathData::ValueNs(_) => {
-                instance_ty = scx.tcx().item_type(ty_def_id);
+                instance_ty = tcx.item_type(ty_def_id);
                 break;
             }
             _ => {
@@ -251,16 +248,16 @@ pub fn symbol_name<'a, 'tcx>(instance: Instance<'tcx>,
 
     // Erase regions because they may not be deterministic when hashed
     // and should not matter anyhow.
-    let instance_ty = scx.tcx().erase_regions(&instance_ty);
+    let instance_ty = tcx.erase_regions(&instance_ty);
 
-    let hash = get_symbol_hash(scx, Some(def_id), instance_ty, Some(substs));
+    let hash = get_symbol_hash(tcx, Some(def_id), instance_ty, Some(substs));
 
     let mut buffer = SymbolPathBuffer {
         names: Vec::new()
     };
 
     item_path::with_forced_absolute_paths(|| {
-        scx.tcx().push_item_path(&mut buffer, def_id);
+        tcx.push_item_path(&mut buffer, def_id);
     });
 
     mangle(buffer.names.into_iter(), &hash)
@@ -281,11 +278,11 @@ fn push(&mut self, text: &str) {
     }
 }
 
-pub fn exported_name_from_type_and_prefix<'a, 'tcx>(scx: &SharedCrateContext<'a, 'tcx>,
+pub fn exported_name_from_type_and_prefix<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
                                                     t: Ty<'tcx>,
                                                     prefix: &str)
                                                     -> String {
-    let hash = get_symbol_hash(scx, None, t, None);
+    let hash = get_symbol_hash(tcx, None, t, None);
     let path = [Symbol::intern(prefix).as_str()];
     mangle(path.iter().cloned(), &hash)
 }

src/librustc_trans/base.rs

@@ -1139,7 +1139,7 @@ fn module_translation<'a, 'tcx>(
 
         let cgu_name = String::from(cgu.name());
         let cgu_id = cgu.work_product_id();
-        let symbol_cache = SymbolCache::new(scx);
+        let symbol_cache = SymbolCache::new(scx.tcx());
         let symbol_name_hash = cgu.compute_symbol_name_hash(scx, &symbol_cache);
 
         // Check whether there is a previous work-product we can
@@ -1239,7 +1239,7 @@ fn module_translation<'a, 'tcx>(
 
     assert_module_sources::assert_module_sources(tcx, &modules);
 
-    symbol_names_test::report_symbol_names(&shared_ccx);
+    symbol_names_test::report_symbol_names(tcx);
 
     if shared_ccx.sess().trans_stats() {
         println!("--- trans stats ---");

src/librustc_trans/consts.rs

@@ -113,7 +113,7 @@ pub fn get_static(ccx: &CrateContext, def_id: DefId) -> ValueRef {
             hir_map::NodeForeignItem(&hir::ForeignItem {
                 ref attrs, span, node: hir::ForeignItemStatic(..), ..
             }) => {
-                let sym = symbol_names::symbol_name(instance, ccx.shared());
+                let sym = symbol_names::symbol_name(instance, ccx.tcx());
                 let g = if let Some(name) =
                         attr::first_attr_value_str_by_name(&attrs, "linkage") {
                     // If this is a static with a linkage specified, then we need to handle
@@ -173,7 +173,7 @@ pub fn get_static(ccx: &CrateContext, def_id: DefId) -> ValueRef {
 
         g
     } else {
-        let sym = symbol_names::symbol_name(instance, ccx.shared());
+        let sym = symbol_names::symbol_name(instance, ccx.tcx());
 
         // FIXME(nagisa): perhaps the map of externs could be offloaded to llvm somehow?
         // FIXME(nagisa): investigate whether it can be changed into define_global

src/librustc_trans/partitioning.rs

@@ -177,7 +177,7 @@ pub fn work_product_dep_node(&self) -> DepNode<DefId> {
     pub fn compute_symbol_name_hash<'a>(&self,
                                         scx: &SharedCrateContext<'a, 'tcx>,
                                         symbol_cache: &SymbolCache<'a, 'tcx>)
-                                    -> u64 {
+                                        -> u64 {
         let mut state = IchHasher::new();
         let exported_symbols = scx.exported_symbols();
         let all_items = self.items_in_deterministic_order(scx.tcx(), symbol_cache);
@@ -272,14 +272,14 @@ pub fn partition<'a, 'tcx, I>(scx: &SharedCrateContext<'a, 'tcx>,
     let mut initial_partitioning = place_root_translation_items(scx,
                                                                 trans_items);
 
-    debug_dump(scx, "INITIAL PARTITONING:", initial_partitioning.codegen_units.iter());
+    debug_dump(tcx, "INITIAL PARTITONING:", initial_partitioning.codegen_units.iter());
 
     // If the partitioning should produce a fixed count of codegen units, merge
     // until that count is reached.
     if let PartitioningStrategy::FixedUnitCount(count) = strategy {
         merge_codegen_units(&mut initial_partitioning, count, &tcx.crate_name.as_str());
 
-        debug_dump(scx, "POST MERGING:", initial_partitioning.codegen_units.iter());
+        debug_dump(tcx, "POST MERGING:", initial_partitioning.codegen_units.iter());
     }
 
     // In the next step, we use the inlining map to determine which addtional
@@ -289,7 +289,7 @@ pub fn partition<'a, 'tcx, I>(scx: &SharedCrateContext<'a, 'tcx>,
     let post_inlining = place_inlined_translation_items(initial_partitioning,
                                                         inlining_map);
 
-    debug_dump(scx, "POST INLINING:", post_inlining.0.iter());
+    debug_dump(tcx, "POST INLINING:", post_inlining.0.iter());
 
     // Finally, sort by codegen unit name, so that we get deterministic results
     let mut result = post_inlining.0;
@@ -529,7 +529,7 @@ fn numbered_codegen_unit_name(crate_name: &str, index: usize) -> InternedString
     Symbol::intern(&format!("{}{}{}", crate_name, NUMBERED_CODEGEN_UNIT_MARKER, index)).as_str()
 }
 
-fn debug_dump<'a, 'b, 'tcx, I>(scx: &SharedCrateContext<'a, 'tcx>,
+fn debug_dump<'a, 'b, 'tcx, I>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
                                label: &str,
                                cgus: I)
     where I: Iterator<Item=&'b CodegenUnit<'tcx>>,
@@ -537,7 +537,7 @@ fn debug_dump<'a, 'b, 'tcx, I>(scx: &SharedCrateContext<'a, 'tcx>,
 {
     if cfg!(debug_assertions) {
         debug!("{}", label);
-        let symbol_cache = SymbolCache::new(scx);
+        let symbol_cache = SymbolCache::new(tcx);
         for cgu in cgus {
             debug!("CodegenUnit {}:", cgu.name);
 
@@ -548,7 +548,7 @@ fn debug_dump<'a, 'b, 'tcx, I>(scx: &SharedCrateContext<'a, 'tcx>,
                                                    .unwrap_or("<no hash>");
 
                 debug!(" - {} [{:?}] [{}]",
-                       trans_item.to_string(scx.tcx()),
+                       trans_item.to_string(tcx),
                        linkage,
                        symbol_hash);
             }

src/librustc_trans/symbol_cache.rs

@@ -8,9 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use context::SharedCrateContext;
 use std::cell::RefCell;
 use std::rc::Rc;
+use rustc::ty::TyCtxt;
 use trans_item::TransItem;
 use util::nodemap::FxHashMap;
 
@@ -21,14 +21,14 @@
 // Thus they can always be recomputed if needed.
 
 pub struct SymbolCache<'a, 'tcx: 'a> {
-    scx: &'a SharedCrateContext<'a, 'tcx>,
+    tcx: TyCtxt<'a, 'tcx, 'tcx>,
     index: RefCell<FxHashMap<TransItem<'tcx>, Rc<String>>>,
 }
 
 impl<'a, 'tcx> SymbolCache<'a, 'tcx> {
-    pub fn new(scx: &'a SharedCrateContext<'a, 'tcx>) -> Self {
+    pub fn new(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Self {
         SymbolCache {
-            scx,
+            tcx: tcx,
             index: RefCell::new(FxHashMap())
         }
     }
@@ -36,7 +36,7 @@ pub fn new(scx: &'a SharedCrateContext<'a, 'tcx>) -> Self {
     pub fn get(&self, trans_item: TransItem<'tcx>) -> Rc<String> {
         let mut index = self.index.borrow_mut();
         index.entry(trans_item)
-             .or_insert_with(|| Rc::new(trans_item.compute_symbol_name(self.scx)))
+             .or_insert_with(|| Rc::new(trans_item.compute_symbol_name(self.tcx)))
              .clone()
     }
 }

src/librustc_trans/symbol_map.rs

@@ -34,8 +34,9 @@ pub fn build<'a, I>(scx: &SharedCrateContext<'a, 'tcx>,
         where I: Iterator<Item=TransItem<'tcx>>
     {
         // Check for duplicate symbol names
+        let tcx = scx.tcx();
         let mut symbols: Vec<_> = trans_items.map(|trans_item| {
-            (trans_item, trans_item.compute_symbol_name(scx))
+            (trans_item, trans_item.compute_symbol_name(tcx))
         }).collect();
 
         (&mut symbols[..]).sort_by(|&(_, ref sym1), &(_, ref sym2)|{
@@ -124,7 +125,7 @@ pub fn get_or_compute<'map, 'scx>(&'map self,
         if let Some(sym) = self.get(trans_item) {
             Cow::from(sym)
         } else {
-            Cow::from(trans_item.compute_symbol_name(scx))
+            Cow::from(trans_item.compute_symbol_name(scx.tcx()))
         }
     }
 }

src/librustc_trans/symbol_names_test.rs

@@ -17,43 +17,42 @@
 use back::symbol_names;
 use rustc::hir;
 use rustc::hir::intravisit::{self, Visitor, NestedVisitorMap};
+use rustc::ty::TyCtxt;
 use syntax::ast;
 
-use common::SharedCrateContext;
 use monomorphize::Instance;
 
 const SYMBOL_NAME: &'static str = "rustc_symbol_name";
 const ITEM_PATH: &'static str = "rustc_item_path";
 
-pub fn report_symbol_names(scx: &SharedCrateContext) {
+pub fn report_symbol_names<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
     // if the `rustc_attrs` feature is not enabled, then the
     // attributes we are interested in cannot be present anyway, so
     // skip the walk.
-    let tcx = scx.tcx();
     if !tcx.sess.features.borrow().rustc_attrs {
         return;
     }
 
     let _ignore = tcx.dep_graph.in_ignore();
-    let mut visitor = SymbolNamesTest { scx: scx };
+    let mut visitor = SymbolNamesTest { tcx: tcx };
     // FIXME(#37712) could use ItemLikeVisitor if trait items were item-like
     tcx.hir.krate().visit_all_item_likes(&mut visitor.as_deep_visitor());
 }
 
 struct SymbolNamesTest<'a, 'tcx:'a> {
-    scx: &'a SharedCrateContext<'a, 'tcx>,
+    tcx: TyCtxt<'a, 'tcx, 'tcx>,
 }
 
 impl<'a, 'tcx> SymbolNamesTest<'a, 'tcx> {
     fn process_attrs(&mut self,
                      node_id: ast::NodeId) {
-        let tcx = self.scx.tcx();
+        let tcx = self.tcx;
         let def_id = tcx.hir.local_def_id(node_id);
         for attr in tcx.get_attrs(def_id).iter() {
             if attr.check_name(SYMBOL_NAME) {
                 // for now, can only use on monomorphic names
                 let instance = Instance::mono(tcx, def_id);
-                let name = symbol_names::symbol_name(instance, self.scx);
+                let name = symbol_names::symbol_name(instance, self.tcx);
                 tcx.sess.span_err(attr.span, &format!("symbol-name({})", name));
             } else if attr.check_name(ITEM_PATH) {
                 let path = tcx.item_path_str(def_id);

src/librustc_trans/trans_item.rs

@@ -18,7 +18,7 @@
 use attributes;
 use base;
 use consts;
-use context::{CrateContext, SharedCrateContext};
+use context::CrateContext;
 use common;
 use declare;
 use llvm;
@@ -184,16 +184,15 @@ fn predefine_fn(ccx: &CrateContext<'a, 'tcx>,
         ccx.instances().borrow_mut().insert(instance, lldecl);
     }
 
-    pub fn compute_symbol_name(&self,
-                               scx: &SharedCrateContext<'a, 'tcx>) -> String {
+    pub fn compute_symbol_name(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>) -> String {
         match *self {
-            TransItem::Fn(instance) => symbol_names::symbol_name(instance, scx),
+            TransItem::Fn(instance) => symbol_names::symbol_name(instance, tcx),
             TransItem::Static(node_id) => {
-                let def_id = scx.tcx().hir.local_def_id(node_id);
-                symbol_names::symbol_name(Instance::mono(scx.tcx(), def_id), scx)
+                let def_id = tcx.hir.local_def_id(node_id);
+                symbol_names::symbol_name(Instance::mono(tcx, def_id), tcx)
             }
             TransItem::GlobalAsm(node_id) => {
-                let def_id = scx.tcx().hir.local_def_id(node_id);
+                let def_id = tcx.hir.local_def_id(node_id);
                 format!("global_asm_{:?}", def_id)
             }
         }