get_vtable_methods => vtable_methods query

src/librustc/dep_graph/dep_node.rs

@@ -506,6 +506,7 @@ pub fn fingerprint_needed_for_crate_hash(self) -> bool {
     [] SpecializationGraph(DefId),
     [] ObjectSafety(DefId),
     [] FulfillObligation { param_env: ParamEnv<'tcx>, trait_ref: PolyTraitRef<'tcx> },
+    [] VtableMethods { trait_ref: PolyTraitRef<'tcx> },
 
     [] IsCopy { param_env: ParamEnvAnd<'tcx, Ty<'tcx>> },
     [] IsSized { param_env: ParamEnvAnd<'tcx, Ty<'tcx>> },

src/librustc/traits/mod.rs

@@ -650,12 +650,12 @@ pub fn normalize_and_test_predicates<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 /// Given a trait `trait_ref`, iterates the vtable entries
 /// that come from `trait_ref`, including its supertraits.
 #[inline] // FIXME(#35870) Avoid closures being unexported due to impl Trait.
-pub fn get_vtable_methods<'a, 'tcx>(
+pub fn vtable_methods<'a, 'tcx>(
     tcx: TyCtxt<'a, 'tcx, 'tcx>,
     trait_ref: ty::PolyTraitRef<'tcx>)
     -> Vec<Option<(DefId, &'tcx Substs<'tcx>)>>
 {
-    debug!("get_vtable_methods({:?})", trait_ref);
+    debug!("vtable_methods({:?})", trait_ref);
 
     supertraits(tcx, trait_ref).flat_map(move |trait_ref| {
         let trait_methods = tcx.associated_items(trait_ref.def_id())
@@ -664,12 +664,12 @@ pub fn get_vtable_methods<'a, 'tcx>(
         // Now list each method's DefId and Substs (for within its trait).
         // If the method can never be called from this object, produce None.
         trait_methods.map(move |trait_method| {
-            debug!("get_vtable_methods: trait_method={:?}", trait_method);
+            debug!("vtable_methods: trait_method={:?}", trait_method);
             let def_id = trait_method.def_id;
 
             // Some methods cannot be called on an object; skip those.
             if !tcx.is_vtable_safe_method(trait_ref.def_id(), &trait_method) {
-                debug!("get_vtable_methods: not vtable safe");
+                debug!("vtable_methods: not vtable safe");
                 return None;
             }
 
@@ -690,7 +690,7 @@ pub fn get_vtable_methods<'a, 'tcx>(
             // do not want to try and trans it, in that case (see #23435).
             let predicates = tcx.predicates_of(def_id).instantiate_own(tcx, substs);
             if !normalize_and_test_predicates(tcx, predicates.predicates) {
-                debug!("get_vtable_methods: predicates do not hold");
+                debug!("vtable_methods: predicates do not hold");
                 return None;
             }
 
@@ -836,6 +836,7 @@ pub fn provide(providers: &mut ty::maps::Providers) {
         specialization_graph_of: specialize::specialization_graph_provider,
         specializes: specialize::specializes,
         trans_fulfill_obligation: trans::trans_fulfill_obligation,
+        vtable_methods,
         ..*providers
     };
 }
@@ -846,6 +847,7 @@ pub fn provide_extern(providers: &mut ty::maps::Providers) {
         specialization_graph_of: specialize::specialization_graph_provider,
         specializes: specialize::specializes,
         trans_fulfill_obligation: trans::trans_fulfill_obligation,
+        vtable_methods,
         ..*providers
     };
 }

src/librustc/ty/maps/config.rs

@@ -503,6 +503,12 @@ fn describe(_tcx: TyCtxt, _: CrateNum) -> String {
     }
 }
 
+impl<'tcx> QueryDescription for queries::vtable_methods<'tcx> {
+    fn describe(tcx: TyCtxt, key: ty::PolyTraitRef<'tcx> ) -> String {
+        format!("finding all methods for trait {}", tcx.item_path_str(key.def_id()))
+    }
+}
+
 impl<'tcx> QueryDescription for queries::has_copy_closures<'tcx> {
     fn describe(_tcx: TyCtxt, _: CrateNum) -> String {
         format!("seeing if the crate has enabled `Copy` closures")

src/librustc/ty/maps/keys.rs

@@ -143,6 +143,15 @@ fn default_span(&self, tcx: TyCtxt) -> Span {
     }
 }
 
+impl<'tcx> Key for ty::PolyTraitRef<'tcx>{
+    fn map_crate(&self) -> CrateNum {
+        self.def_id().krate
+    }
+    fn default_span(&self, tcx: TyCtxt) -> Span {
+        tcx.def_span(self.def_id())
+    }
+}
+
 impl<'tcx> Key for Ty<'tcx> {
     fn map_crate(&self) -> CrateNum {
         LOCAL_CRATE

src/librustc/ty/maps/mod.rs

@@ -228,6 +228,8 @@
     [] fn item_body_nested_bodies: ItemBodyNestedBodies(DefId) -> ExternBodyNestedBodies,
     [] fn const_is_rvalue_promotable_to_static: ConstIsRvaluePromotableToStatic(DefId) -> bool,
     [] fn is_mir_available: IsMirAvailable(DefId) -> bool,
+    [] fn vtable_methods: vtable_methods_node(ty::PolyTraitRef<'tcx>)
+                          -> Vec<Option<(DefId, &'tcx Substs<'tcx>)>>,
 
     [] fn trans_fulfill_obligation: fulfill_obligation_dep_node(
         (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>)) -> Vtable<'tcx, ()>,
@@ -470,3 +472,7 @@ fn collect_and_partition_translation_items_node<'tcx>(_: CrateNum) -> DepConstru
 fn output_filenames_node<'tcx>(_: CrateNum) -> DepConstructor<'tcx> {
     DepConstructor::OutputFilenames
 }
+
+fn vtable_methods_node<'tcx>(trait_ref: ty::PolyTraitRef<'tcx>) -> DepConstructor<'tcx> {
+    DepConstructor::VtableMethods{ trait_ref }
+}

src/librustc/ty/maps/plumbing.rs

@@ -749,6 +749,7 @@ pub fn force_from_dep_node<'a, 'gcx, 'lcx>(tcx: TyCtxt<'a, 'gcx, 'lcx>,
         DepKind::CodegenUnit |
         DepKind::CompileCodegenUnit |
         DepKind::FulfillObligation |
+        DepKind::VtableMethods |
 
         // These are just odd
         DepKind::Null |

src/librustc_trans/collector.rs

@@ -849,7 +849,7 @@ fn create_trans_items_for_vtable_methods<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
             assert!(!poly_trait_ref.has_escaping_regions());
 
             // Walk all methods of the trait, including those of its supertraits
-            let methods = traits::get_vtable_methods(tcx, poly_trait_ref);
+            let methods = tcx.vtable_methods(poly_trait_ref);
             let methods = methods.into_iter().filter_map(|method| method)
                 .map(|(def_id, substs)| ty::Instance::resolve(
                         tcx,

src/librustc_trans/meth.rs

@@ -9,7 +9,6 @@
 // except according to those terms.
 
 use llvm::ValueRef;
-use rustc::traits;
 use callee;
 use common::*;
 use builder::Builder;
@@ -87,7 +86,7 @@ pub fn get_vtable<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
 
     if let Some(trait_ref) = trait_ref {
         let trait_ref = trait_ref.with_self_ty(tcx, ty);
-        let methods = traits::get_vtable_methods(tcx, trait_ref).into_iter().map(|opt_mth| {
+        let methods = tcx.vtable_methods(trait_ref).into_iter().map(|opt_mth| {
             opt_mth.map_or(nullptr, |(def_id, substs)| {
                 callee::resolve_and_get_fn(ccx, def_id, substs)
             })