Rollup merge of #57634 - oli-obk:remove_unused_argument, r=davidtwco

Remove an unused function argument

The only use was a debug printing, which might help someone with debugging dataflow problems, but seems otherwise useless

src/librustc/hir/intravisit.rs

@@ -35,11 +35,9 @@ use syntax::ast::{NodeId, CRATE_NODE_ID, Ident, Name, Attribute};
 use syntax_pos::Span;
 use hir::*;
 use hir::def::Def;
-use hir::map::{self, Map};
+use hir::map::Map;
 use super::itemlikevisit::DeepVisitor;
 
-use std::cmp;
-
 #[derive(Copy, Clone)]
 pub enum FnKind<'a> {
     /// `#[xxx] pub async/const/extern "Abi" fn foo()`
@@ -1133,57 +1131,3 @@ pub fn walk_defaultness<'v, V: Visitor<'v>>(_: &mut V, _: &'v Defaultness) {
     // the right thing to do, should content be added in the future,
     // would be to walk it.
 }
-
-#[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug)]
-pub struct IdRange {
-    pub min: NodeId,
-    pub max: NodeId,
-}
-
-impl IdRange {
-    pub fn max() -> IdRange {
-        IdRange {
-            min: NodeId::MAX,
-            max: NodeId::from_u32(0),
-        }
-    }
-
-    pub fn empty(&self) -> bool {
-        self.min >= self.max
-    }
-
-    pub fn contains(&self, id: NodeId) -> bool {
-        id >= self.min && id < self.max
-    }
-
-    pub fn add(&mut self, id: NodeId) {
-        self.min = cmp::min(self.min, id);
-        self.max = cmp::max(self.max, NodeId::from_u32(id.as_u32() + 1));
-    }
-}
-
-
-pub struct IdRangeComputingVisitor<'a, 'hir: 'a> {
-    result: IdRange,
-    map: &'a map::Map<'hir>,
-}
-
-impl<'a, 'hir> IdRangeComputingVisitor<'a, 'hir> {
-    pub fn new(map: &'a map::Map<'hir>) -> IdRangeComputingVisitor<'a, 'hir> {
-        IdRangeComputingVisitor { result: IdRange::max(), map: map }
-    }
-
-    pub fn result(&self) -> IdRange {
-        self.result
-    }
-}
-
-impl<'a, 'hir> Visitor<'hir> for IdRangeComputingVisitor<'a, 'hir> {
-    fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'hir> {
-        NestedVisitorMap::OnlyBodies(&self.map)
-    }
-
-    fn visit_id(&mut self, id: NodeId) {
-        self.result.add(id);
-    }
-}

src/librustc_borrowck/borrowck/mod.rs

@@ -39,7 +39,6 @@ use syntax_pos::{MultiSpan, Span};
 use errors::{Applicability, DiagnosticBuilder, DiagnosticId};
 
 use rustc::hir;
-use rustc::hir::intravisit::{self, Visitor};
 
 use dataflow::{DataFlowContext, BitwiseOperator, DataFlowOperator, KillFrom};
 
@@ -157,12 +156,6 @@ fn build_borrowck_dataflow_data<'a, 'c, 'tcx, F>(this: &mut BorrowckCtxt<'a, 'tc
     where F: FnOnce(&mut BorrowckCtxt<'a, 'tcx>) -> &'c cfg::CFG
 {
     // Check the body of fn items.
-    let tcx = this.tcx;
-    let id_range = {
-        let mut visitor = intravisit::IdRangeComputingVisitor::new(&tcx.hir());
-        visitor.visit_body(this.body);
-        visitor.result()
-    };
     let (all_loans, move_data) =
         gather_loans::gather_loans_in_fn(this, body_id);
 
@@ -184,7 +177,6 @@ fn build_borrowck_dataflow_data<'a, 'c, 'tcx, F>(this: &mut BorrowckCtxt<'a, 'tc
                              Some(this.body),
                              cfg,
                              LoanDataFlowOperator,
-                             id_range,
                              all_loans.len());
     for (loan_idx, loan) in all_loans.iter().enumerate() {
         loan_dfcx.add_gen(loan.gen_scope.item_local_id(), loan_idx);
@@ -198,7 +190,6 @@ fn build_borrowck_dataflow_data<'a, 'c, 'tcx, F>(this: &mut BorrowckCtxt<'a, 'tc
     let flowed_moves = move_data::FlowedMoveData::new(move_data,
                                                       this,
                                                       cfg,
-                                                      id_range,
                                                       this.body);
 
     Some(AnalysisData { all_loans,

src/librustc_borrowck/borrowck/move_data.rs

@@ -15,7 +15,6 @@ use std::rc::Rc;
 use std::usize;
 use syntax_pos::Span;
 use rustc::hir;
-use rustc::hir::intravisit::IdRange;
 
 #[derive(Default)]
 pub struct MoveData<'tcx> {
@@ -559,7 +558,6 @@ impl<'a, 'tcx> FlowedMoveData<'a, 'tcx> {
     pub fn new(move_data: MoveData<'tcx>,
                bccx: &BorrowckCtxt<'a, 'tcx>,
                cfg: &cfg::CFG,
-               id_range: IdRange,
                body: &hir::Body)
                -> FlowedMoveData<'a, 'tcx> {
         let tcx = bccx.tcx;
@@ -570,7 +568,6 @@ impl<'a, 'tcx> FlowedMoveData<'a, 'tcx> {
                                  Some(body),
                                  cfg,
                                  MoveDataFlowOperator,
-                                 id_range,
                                  move_data.moves.borrow().len());
         let mut dfcx_assign =
             DataFlowContext::new(tcx,
@@ -578,7 +575,6 @@ impl<'a, 'tcx> FlowedMoveData<'a, 'tcx> {
                                  Some(body),
                                  cfg,
                                  AssignDataFlowOperator,
-                                 id_range,
                                  move_data.var_assignments.borrow().len());
 
         move_data.add_gen_kills(bccx,

src/librustc_borrowck/dataflow.rs

@@ -15,7 +15,7 @@ use rustc_data_structures::graph::implementation::OUTGOING;
 
 use rustc::util::nodemap::FxHashMap;
 use rustc::hir;
-use rustc::hir::intravisit::{self, IdRange};
+use rustc::hir::intravisit;
 use rustc::hir::print as pprust;
 
 
@@ -230,16 +230,15 @@ impl<'a, 'tcx, O:DataFlowOperator> DataFlowContext<'a, 'tcx, O> {
                body: Option<&hir::Body>,
                cfg: &cfg::CFG,
                oper: O,
-               id_range: IdRange,
                bits_per_id: usize) -> DataFlowContext<'a, 'tcx, O> {
         let usize_bits = mem::size_of::<usize>() * 8;
         let words_per_id = (bits_per_id + usize_bits - 1) / usize_bits;
         let num_nodes = cfg.graph.all_nodes().len();
 
-        debug!("DataFlowContext::new(analysis_name: {}, id_range={:?}, \
+        debug!("DataFlowContext::new(analysis_name: {}, \
                                      bits_per_id={}, words_per_id={}) \
                                      num_nodes: {}",
-               analysis_name, id_range, bits_per_id, words_per_id,
+               analysis_name, bits_per_id, words_per_id,
                num_nodes);
 
         let entry = if oper.initial_value() { usize::MAX } else {0};