librustc_middle: Rename upvars query to upvars_mentioned

As part of supporting RFC 2229, we will be capturing all the Places that
were mentioned in the closure.

This commit modifies the name of the upvars query to upvars_mentioned.

Co-authored-by: Aman Arora <me@aman-arora.com>
Co-authored-by: Chris Pardy <chrispardy36@gmail.com>

src/librustc_middle/arena.rs

@@ -61,7 +61,7 @@ macro_rules! arena_types {
             [few] privacy_access_levels: rustc_middle::middle::privacy::AccessLevels,
             [few] foreign_module: rustc_middle::middle::cstore::ForeignModule,
             [few] foreign_modules: Vec<rustc_middle::middle::cstore::ForeignModule>,
-            [] upvars: rustc_data_structures::fx::FxIndexMap<rustc_hir::HirId, rustc_hir::Upvar>,
+            [] upvars_mentioned: rustc_data_structures::fx::FxIndexMap<rustc_hir::HirId, rustc_hir::Upvar>,
             [] object_safety_violations: rustc_middle::traits::ObjectSafetyViolation,
             [] codegen_unit: rustc_middle::mir::mono::CodegenUnit<$tcx>,
             [] attribute: rustc_ast::ast::Attribute,

src/librustc_middle/mir/mod.rs

@@ -2439,7 +2439,7 @@ impl<'tcx> Debug for Rvalue<'tcx> {
                             };
                             let mut struct_fmt = fmt.debug_struct(&name);
 
-                            if let Some(upvars) = tcx.upvars(def_id) {
+                            if let Some(upvars) = tcx.upvars_mentioned(def_id) {
                                 for (&var_id, place) in upvars.keys().zip(places) {
                                     let var_name = tcx.hir().name(var_id);
                                     struct_fmt.field(&var_name.as_str(), place);
@@ -2458,7 +2458,7 @@ impl<'tcx> Debug for Rvalue<'tcx> {
                             let name = format!("[generator@{:?}]", tcx.hir().span(hir_id));
                             let mut struct_fmt = fmt.debug_struct(&name);
 
-                            if let Some(upvars) = tcx.upvars(def_id) {
+                            if let Some(upvars) = tcx.upvars_mentioned(def_id) {
                                 for (&var_id, place) in upvars.keys().zip(places) {
                                     let var_name = tcx.hir().name(var_id);
                                     struct_fmt.field(&var_name.as_str(), place);

src/librustc_middle/query/mod.rs

@@ -1040,7 +1040,7 @@ rustc_queries! {
             desc { "generating a postorder list of CrateNums" }
         }
 
-        query upvars(_: DefId) -> Option<&'tcx FxIndexMap<hir::HirId, hir::Upvar>> {
+        query upvars_mentioned(_: DefId) -> Option<&'tcx FxIndexMap<hir::HirId, hir::Upvar>> {
             eval_always
         }
         query maybe_unused_trait_import(def_id: LocalDefId) -> bool {

src/librustc_middle/ty/print/pretty.rs

@@ -611,7 +611,7 @@ pub trait PrettyPrinter<'tcx>:
                         let mut sep = " ";
                         for (&var_id, upvar_ty) in self
                             .tcx()
-                            .upvars(did)
+                            .upvars_mentioned(did)
                             .as_ref()
                             .iter()
                             .flat_map(|v| v.keys())
@@ -660,7 +660,7 @@ pub trait PrettyPrinter<'tcx>:
                         let mut sep = " ";
                         for (&var_id, upvar_ty) in self
                             .tcx()
-                            .upvars(did)
+                            .upvars_mentioned(did)
                             .as_ref()
                             .iter()
                             .flat_map(|v| v.keys())

src/librustc_mir/borrow_check/diagnostics/mod.rs

@@ -377,11 +377,16 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                     self.describe_field_from_ty(&ty, field, variant_index)
                 }
                 ty::Closure(def_id, _) | ty::Generator(def_id, _, _) => {
-                    // `tcx.upvars(def_id)` returns an `Option`, which is `None` in case
+                    // `tcx.upvars_mentioned(def_id)` returns an `Option`, which is `None` in case
                     // the closure comes from another crate. But in that case we wouldn't
                     // be borrowck'ing it, so we can just unwrap:
-                    let (&var_id, _) =
-                        self.infcx.tcx.upvars(def_id).unwrap().get_index(field.index()).unwrap();
+                    let (&var_id, _) = self
+                        .infcx
+                        .tcx
+                        .upvars_mentioned(def_id)
+                        .unwrap()
+                        .get_index(field.index())
+                        .unwrap();
 
                     self.infcx.tcx.hir().name(var_id).to_string()
                 }
@@ -809,7 +814,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         let expr = &self.infcx.tcx.hir().expect_expr(hir_id).kind;
         debug!("closure_span: hir_id={:?} expr={:?}", hir_id, expr);
         if let hir::ExprKind::Closure(.., body_id, args_span, _) = expr {
-            for (upvar, place) in self.infcx.tcx.upvars(def_id)?.values().zip(places) {
+            for (upvar, place) in self.infcx.tcx.upvars_mentioned(def_id)?.values().zip(places) {
                 match place {
                     Operand::Copy(place) | Operand::Move(place)
                         if target_place == place.as_ref() =>

src/librustc_mir_build/hair/cx/expr.rs

@@ -386,7 +386,7 @@ fn make_mirror_unadjusted<'a, 'tcx>(
             };
             let upvars = cx
                 .tcx
-                .upvars(def_id)
+                .upvars_mentioned(def_id)
                 .iter()
                 .flat_map(|upvars| upvars.iter())
                 .zip(substs.upvar_tys())

src/librustc_passes/liveness.rs

@@ -463,7 +463,7 @@ fn visit_expr<'tcx>(ir: &mut IrMaps<'tcx>, expr: &'tcx Expr<'tcx>) {
         hir::ExprKind::Path(hir::QPath::Resolved(_, ref path)) => {
             debug!("expr {}: path that leads to {:?}", expr.hir_id, path.res);
             if let Res::Local(var_hir_id) = path.res {
-                let upvars = ir.tcx.upvars(ir.body_owner);
+                let upvars = ir.tcx.upvars_mentioned(ir.body_owner);
                 if !upvars.map_or(false, |upvars| upvars.contains_key(&var_hir_id)) {
                     ir.add_live_node_for_node(expr.hir_id, ExprNode(expr.span));
                 }
@@ -481,8 +481,8 @@ fn visit_expr<'tcx>(ir: &mut IrMaps<'tcx>, expr: &'tcx Expr<'tcx>) {
             // construction site.
             let mut call_caps = Vec::new();
             let closure_def_id = ir.tcx.hir().local_def_id(expr.hir_id);
-            if let Some(upvars) = ir.tcx.upvars(closure_def_id) {
-                let parent_upvars = ir.tcx.upvars(ir.body_owner);
+            if let Some(upvars) = ir.tcx.upvars_mentioned(closure_def_id) {
+                let parent_upvars = ir.tcx.upvars_mentioned(ir.body_owner);
                 call_caps.extend(upvars.iter().filter_map(|(&var_id, upvar)| {
                     let has_parent =
                         parent_upvars.map_or(false, |upvars| upvars.contains_key(&var_id));
@@ -1364,7 +1364,7 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
     ) -> LiveNode {
         match path.res {
             Res::Local(hid) => {
-                let upvars = self.ir.tcx.upvars(self.ir.body_owner);
+                let upvars = self.ir.tcx.upvars_mentioned(self.ir.body_owner);
                 if !upvars.map_or(false, |upvars| upvars.contains_key(&hid)) {
                     self.access_var(hir_id, hid, succ, acc, path.span)
                 } else {
@@ -1535,7 +1535,7 @@ impl<'tcx> Liveness<'_, 'tcx> {
         match expr.kind {
             hir::ExprKind::Path(hir::QPath::Resolved(_, ref path)) => {
                 if let Res::Local(var_hid) = path.res {
-                    let upvars = self.ir.tcx.upvars(self.ir.body_owner);
+                    let upvars = self.ir.tcx.upvars_mentioned(self.ir.body_owner);
                     if !upvars.map_or(false, |upvars| upvars.contains_key(&var_hid)) {
                         // Assignment to an immutable variable or argument: only legal
                         // if there is no later assignment. If this local is actually

src/librustc_passes/upvars.rs

@@ -10,7 +10,7 @@ use rustc_middle::ty::TyCtxt;
 use rustc_span::Span;
 
 pub fn provide(providers: &mut Providers<'_>) {
-    providers.upvars = |tcx, def_id| {
+    providers.upvars_mentioned = |tcx, def_id| {
         if !tcx.is_closure(def_id) {
             return None;
         }
@@ -89,7 +89,7 @@ impl Visitor<'tcx> for CaptureCollector<'a, 'tcx> {
     fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
         if let hir::ExprKind::Closure(..) = expr.kind {
             let closure_def_id = self.tcx.hir().local_def_id(expr.hir_id);
-            if let Some(upvars) = self.tcx.upvars(closure_def_id) {
+            if let Some(upvars) = self.tcx.upvars_mentioned(closure_def_id) {
                 // Every capture of a closure expression is a local in scope,
                 // that is moved/copied/borrowed into the closure value, and
                 // for this analysis they are like any other access to a local.

src/librustc_trait_selection/traits/error_reporting/suggestions.rs

@@ -1380,7 +1380,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
         let mut interior_or_upvar_span = None;
         let mut interior_extra_info = None;
 
-        if let Some(upvars) = self.tcx.upvars(generator_did) {
+        if let Some(upvars) = self.tcx.upvars_mentioned(generator_did) {
             interior_or_upvar_span = upvars.iter().find_map(|(upvar_id, upvar)| {
                 let upvar_ty = tables.node_type(*upvar_id);
                 let upvar_ty = self.resolve_vars_if_possible(&upvar_ty);

src/librustc_typeck/check/closure.rs

@@ -92,18 +92,20 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             base_substs.extend_to(self.tcx, expr_def_id.to_def_id(), |param, _| match param.kind {
                 GenericParamDefKind::Lifetime => span_bug!(expr.span, "closure has lifetime param"),
                 GenericParamDefKind::Type { .. } => if param.index as usize == tupled_upvars_idx {
-                    self.tcx.mk_tup(self.tcx.upvars(expr_def_id).iter().flat_map(|upvars| {
-                        upvars.iter().map(|(&var_hir_id, _)| {
-                            // Create type variables (for now) to represent the transformed
-                            // types of upvars. These will be unified during the upvar
-                            // inference phase (`upvar.rs`).
-                            self.infcx.next_ty_var(TypeVariableOrigin {
-                                // FIXME(eddyb) distinguish upvar inference variables from the rest.
-                                kind: TypeVariableOriginKind::ClosureSynthetic,
-                                span: self.tcx.hir().span(var_hir_id),
+                    self.tcx.mk_tup(self.tcx.upvars_mentioned(expr_def_id).iter().flat_map(
+                        |upvars| {
+                            upvars.iter().map(|(&var_hir_id, _)| {
+                                // Create type variables (for now) to represent the transformed
+                                // types of upvars. These will be unified during the upvar
+                                // inference phase (`upvar.rs`).
+                                self.infcx.next_ty_var(TypeVariableOrigin {
+                                    // FIXME(eddyb) distinguish upvar inference variables from the rest.
+                                    kind: TypeVariableOriginKind::ClosureSynthetic,
+                                    span: self.tcx.hir().span(var_hir_id),
+                                })
                             })
-                        })
-                    }))
+                        },
+                    ))
                 } else {
                     // Create type variables (for now) to represent the various
                     // pieces of information kept in `{Closure,Generic}Substs`.

src/librustc_typeck/check/upvar.rs

@@ -111,7 +111,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             None
         };
 
-        if let Some(upvars) = self.tcx.upvars(closure_def_id) {
+        if let Some(upvars) = self.tcx.upvars_mentioned(closure_def_id) {
             let mut upvar_list: FxIndexMap<hir::HirId, ty::UpvarId> =
                 FxIndexMap::with_capacity_and_hasher(upvars.len(), Default::default());
             for (&var_hir_id, _) in upvars.iter() {
@@ -218,7 +218,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         let tcx = self.tcx;
         let closure_def_id = tcx.hir().local_def_id(closure_id);
 
-        tcx.upvars(closure_def_id)
+        tcx.upvars_mentioned(closure_def_id)
             .iter()
             .flat_map(|upvars| {
                 upvars.iter().map(|(&var_hir_id, _)| {

src/librustc_typeck/expr_use_visitor.rs

@@ -539,7 +539,7 @@ impl<'a, 'tcx> ExprUseVisitor<'a, 'tcx> {
         debug!("walk_captures({:?})", closure_expr);
 
         let closure_def_id = self.tcx().hir().local_def_id(closure_expr.hir_id);
-        if let Some(upvars) = self.tcx().upvars(closure_def_id) {
+        if let Some(upvars) = self.tcx().upvars_mentioned(closure_def_id) {
             for &var_id in upvars.keys() {
                 let upvar_id = ty::UpvarId {
                     var_path: ty::UpvarPath { hir_id: var_id },

src/librustc_typeck/mem_categorization.rs

@@ -159,7 +159,7 @@ impl<'a, 'tcx> MemCategorizationContext<'a, 'tcx> {
             infcx,
             param_env,
             body_owner,
-            upvars: infcx.tcx.upvars(body_owner),
+            upvars: infcx.tcx.upvars_mentioned(body_owner),
         }
     }