Use &IndexSlice instead of &IndexVec where possible

All the same reasons as for `[T]`: more general, less pointer chasing, and `&mut IndexSlice` emphasizes that it doesn't change *length*.

compiler/rustc_mir_transform/src/check_alignment.rs

@@ -128,7 +128,7 @@ fn split_block(
 
 fn insert_alignment_check<'tcx>(
     tcx: TyCtxt<'tcx>,
-    local_decls: &mut LocalDecls<'tcx>,
+    local_decls: &mut IndexVec<Local, LocalDecl<'tcx>>,
     block_data: &mut BasicBlockData<'tcx>,
     pointer: Place<'tcx>,
     pointee_ty: Ty<'tcx>,

compiler/rustc_mir_transform/src/const_prop.rs

@@ -7,7 +7,7 @@ use rustc_const_eval::const_eval::CheckAlignment;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def::DefKind;
 use rustc_index::bit_set::BitSet;
-use rustc_index::vec::IndexVec;
+use rustc_index::vec::{IndexSlice, IndexVec};
 use rustc_middle::mir::visit::{
     MutVisitor, MutatingUseContext, NonMutatingUseContext, PlaceContext, Visitor,
 };
@@ -127,7 +127,7 @@ impl<'tcx> MirPass<'tcx> for ConstProp {
 
         let dummy_body = &Body::new(
             body.source,
-            (*body.basic_blocks).clone(),
+            (*body.basic_blocks).to_owned(),
             body.source_scopes.clone(),
             body.local_decls.clone(),
             Default::default(),
@@ -319,7 +319,7 @@ struct ConstPropagator<'mir, 'tcx> {
     ecx: InterpCx<'mir, 'tcx, ConstPropMachine<'mir, 'tcx>>,
     tcx: TyCtxt<'tcx>,
     param_env: ParamEnv<'tcx>,
-    local_decls: &'mir IndexVec<Local, LocalDecl<'tcx>>,
+    local_decls: &'mir IndexSlice<Local, LocalDecl<'tcx>>,
 }
 
 impl<'tcx> LayoutOfHelpers<'tcx> for ConstPropagator<'_, 'tcx> {

compiler/rustc_mir_transform/src/const_prop_lint.rs

@@ -9,7 +9,7 @@ use rustc_const_eval::interpret::{
 };
 use rustc_hir::def::DefKind;
 use rustc_hir::HirId;
-use rustc_index::vec::IndexVec;
+use rustc_index::vec::IndexSlice;
 use rustc_middle::mir::visit::Visitor;
 use rustc_middle::mir::*;
 use rustc_middle::ty::layout::{LayoutError, LayoutOf, LayoutOfHelpers, TyAndLayout};
@@ -103,7 +103,7 @@ impl<'tcx> MirLint<'tcx> for ConstProp {
 
         let dummy_body = &Body::new(
             body.source,
-            (*body.basic_blocks).clone(),
+            (*body.basic_blocks).to_owned(),
             body.source_scopes.clone(),
             body.local_decls.clone(),
             Default::default(),
@@ -130,8 +130,8 @@ struct ConstPropagator<'mir, 'tcx> {
     ecx: InterpCx<'mir, 'tcx, ConstPropMachine<'mir, 'tcx>>,
     tcx: TyCtxt<'tcx>,
     param_env: ParamEnv<'tcx>,
-    source_scopes: &'mir IndexVec<SourceScope, SourceScopeData<'tcx>>,
-    local_decls: &'mir IndexVec<Local, LocalDecl<'tcx>>,
+    source_scopes: &'mir IndexSlice<SourceScope, SourceScopeData<'tcx>>,
+    local_decls: &'mir IndexSlice<Local, LocalDecl<'tcx>>,
     // Because we have `MutVisitor` we can't obtain the `SourceInfo` from a `Location`. So we store
     // the last known `SourceInfo` here and just keep revisiting it.
     source_info: Option<SourceInfo>,

compiler/rustc_mir_transform/src/copy_prop.rs

@@ -1,5 +1,5 @@
 use rustc_index::bit_set::BitSet;
-use rustc_index::vec::IndexVec;
+use rustc_index::vec::IndexSlice;
 use rustc_middle::mir::visit::*;
 use rustc_middle::mir::*;
 use rustc_middle::ty::TyCtxt;
@@ -102,7 +102,7 @@ struct Replacer<'a, 'tcx> {
     fully_moved: BitSet<Local>,
     storage_to_remove: BitSet<Local>,
     borrowed_locals: BitSet<Local>,
-    copy_classes: &'a IndexVec<Local, Local>,
+    copy_classes: &'a IndexSlice<Local, Local>,
 }
 
 impl<'tcx> MutVisitor<'tcx> for Replacer<'_, 'tcx> {

compiler/rustc_mir_transform/src/coverage/graph.rs

@@ -5,7 +5,7 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::graph::dominators::{self, Dominators};
 use rustc_data_structures::graph::{self, GraphSuccessors, WithNumNodes, WithStartNode};
 use rustc_index::bit_set::BitSet;
-use rustc_index::vec::IndexVec;
+use rustc_index::vec::{IndexSlice, IndexVec};
 use rustc_middle::mir::coverage::*;
 use rustc_middle::mir::{self, BasicBlock, BasicBlockData, Terminator, TerminatorKind};
 
@@ -176,10 +176,10 @@ impl CoverageGraph {
 
     fn add_basic_coverage_block(
         bcbs: &mut IndexVec<BasicCoverageBlock, BasicCoverageBlockData>,
-        bb_to_bcb: &mut IndexVec<BasicBlock, Option<BasicCoverageBlock>>,
+        bb_to_bcb: &mut IndexSlice<BasicBlock, Option<BasicCoverageBlock>>,
         basic_blocks: Vec<BasicBlock>,
     ) {
-        let bcb = BasicCoverageBlock::from_usize(bcbs.len());
+        let bcb = bcbs.next_index();
         for &bb in basic_blocks.iter() {
             bb_to_bcb[bb] = Some(bcb);
         }

compiler/rustc_mir_transform/src/lower_slice_len.rs

@@ -3,7 +3,7 @@
 
 use crate::MirPass;
 use rustc_hir::def_id::DefId;
-use rustc_index::vec::IndexVec;
+use rustc_index::vec::IndexSlice;
 use rustc_middle::mir::*;
 use rustc_middle::ty::{self, TyCtxt};
 
@@ -42,7 +42,7 @@ struct SliceLenPatchInformation<'tcx> {
 fn lower_slice_len_call<'tcx>(
     tcx: TyCtxt<'tcx>,
     block: &mut BasicBlockData<'tcx>,
-    local_decls: &IndexVec<Local, LocalDecl<'tcx>>,
+    local_decls: &IndexSlice<Local, LocalDecl<'tcx>>,
     slice_len_fn_item_def_id: DefId,
 ) {
     let mut patch_found: Option<SliceLenPatchInformation<'_>> = None;

compiler/rustc_mir_transform/src/simplify.rs

@@ -29,7 +29,7 @@
 
 use crate::MirPass;
 use rustc_data_structures::fx::{FxHashSet, FxIndexSet};
-use rustc_index::vec::{Idx, IndexVec};
+use rustc_index::vec::{Idx, IndexSlice, IndexVec};
 use rustc_middle::mir::coverage::*;
 use rustc_middle::mir::visit::{MutVisitor, MutatingUseContext, PlaceContext, Visitor};
 use rustc_middle::mir::*;
@@ -67,7 +67,7 @@ impl<'tcx> MirPass<'tcx> for SimplifyCfg {
 }
 
 pub struct CfgSimplifier<'a, 'tcx> {
-    basic_blocks: &'a mut IndexVec<BasicBlock, BasicBlockData<'tcx>>,
+    basic_blocks: &'a mut IndexSlice<BasicBlock, BasicBlockData<'tcx>>,
     pred_count: IndexVec<BasicBlock, u32>,
 }
 
@@ -369,8 +369,8 @@ pub fn remove_dead_blocks<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
 /// instances in a single body, so the strategy described above is applied to
 /// coverage counters from each instance individually.
 fn save_unreachable_coverage(
-    basic_blocks: &mut IndexVec<BasicBlock, BasicBlockData<'_>>,
-    source_scopes: &IndexVec<SourceScope, SourceScopeData<'_>>,
+    basic_blocks: &mut IndexSlice<BasicBlock, BasicBlockData<'_>>,
+    source_scopes: &IndexSlice<SourceScope, SourceScopeData<'_>>,
     first_dead_block: usize,
 ) {
     // Identify instances that still have some live coverage counters left.
@@ -489,7 +489,7 @@ fn make_local_map<V>(
     local_decls: &mut IndexVec<Local, V>,
     used_locals: &UsedLocals,
 ) -> IndexVec<Local, Option<Local>> {
-    let mut map: IndexVec<Local, Option<Local>> = IndexVec::from_elem(None, &*local_decls);
+    let mut map: IndexVec<Local, Option<Local>> = IndexVec::from_elem(None, local_decls);
     let mut used = Local::new(0);
 
     for alive_index in local_decls.indices() {

compiler/rustc_mir_transform/src/ssa.rs

@@ -1,7 +1,7 @@
 use either::Either;
 use rustc_data_structures::graph::dominators::Dominators;
 use rustc_index::bit_set::BitSet;
-use rustc_index::vec::IndexVec;
+use rustc_index::vec::{IndexSlice, IndexVec};
 use rustc_middle::middle::resolve_bound_vars::Set1;
 use rustc_middle::mir::visit::*;
 use rustc_middle::mir::*;
@@ -135,7 +135,7 @@ impl SsaLocals {
     ///   _d => _a // transitively through _c
     ///
     /// Exception: we do not see through the return place, as it cannot be substituted.
-    pub fn copy_classes(&self) -> &IndexVec<Local, Local> {
+    pub fn copy_classes(&self) -> &IndexSlice<Local, Local> {
         &self.copy_classes
     }