Move rustc_mir::transform to rustc_mir_transform.

1 files changed, 2 insertions, 603 deletions

diff --git a/compiler/rustc_mir/src/transform/mod.rs b/compiler/rustc_mir/src/transform/mod.rs
index d4c2456e9a4..abf43dd1d23 100644
--- a/compiler/rustc_mir/src/transform/mod.rs
+++ b/compiler/rustc_mir/src/transform/mod.rs
@@ -1,149 +1,12 @@
-use crate::{shim, util};
-use required_consts::RequiredConstsVisitor;
-use rustc_data_structures::fx::FxHashSet;
-use rustc_data_structures::steal::Steal;
-use rustc_hir as hir;
-use rustc_hir::def_id::{DefId, LocalDefId};
-use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
-use rustc_index::vec::IndexVec;
-use rustc_middle::mir::visit::Visitor as _;
-use rustc_middle::mir::{traversal, Body, ConstQualifs, MirPhase, Promoted};
-use rustc_middle::ty::query::Providers;
-use rustc_middle::ty::{self, TyCtxt, TypeFoldable};
-use rustc_span::{Span, Symbol};
+use rustc_middle::mir::Body;
+use rustc_middle::ty::TyCtxt;
 use std::borrow::Cow;
 
-pub mod abort_unwinding_calls;
-pub mod add_call_guards;
-pub mod add_moves_for_packed_drops;
-pub mod add_retag;
-pub mod check_const_item_mutation;
 pub mod check_consts;
-pub mod check_packed_ref;
-pub mod check_unsafety;
-pub mod cleanup_post_borrowck;
-pub mod const_debuginfo;
-pub mod const_goto;
-pub mod const_prop;
-pub mod coverage;
-pub mod deaggregator;
-pub mod deduplicate_blocks;
-pub mod dest_prop;
-pub mod dump_mir;
-pub mod early_otherwise_branch;
-pub mod elaborate_drops;
-pub mod function_item_references;
-pub mod generator;
-pub mod inline;
-pub mod instcombine;
-pub mod lower_intrinsics;
-pub mod lower_slice_len;
-pub mod match_branches;
-pub mod multiple_return_terminators;
-pub mod nrvo;
 pub mod promote_consts;
-pub mod remove_noop_landing_pads;
-pub mod remove_storage_markers;
-pub mod remove_unneeded_drops;
-pub mod remove_zsts;
-pub mod required_consts;
 pub mod rustc_peek;
-pub mod separate_const_switch;
-pub mod simplify;
-pub mod simplify_branches;
-pub mod simplify_comparison_integral;
-pub mod simplify_try;
-pub mod uninhabited_enum_branching;
-pub mod unreachable_prop;
 pub mod validate;
 
-pub use rustc_middle::mir::MirSource;
-
-pub(crate) fn provide(providers: &mut Providers) {
-    self::check_unsafety::provide(providers);
-    self::check_packed_ref::provide(providers);
-    *providers = Providers {
-        mir_keys,
-        mir_const,
-        mir_const_qualif: |tcx, def_id| {
-            let def_id = def_id.expect_local();
-            if let Some(def) = ty::WithOptConstParam::try_lookup(def_id, tcx) {
-                tcx.mir_const_qualif_const_arg(def)
-            } else {
-                mir_const_qualif(tcx, ty::WithOptConstParam::unknown(def_id))
-            }
-        },
-        mir_const_qualif_const_arg: |tcx, (did, param_did)| {
-            mir_const_qualif(tcx, ty::WithOptConstParam { did, const_param_did: Some(param_did) })
-        },
-        mir_promoted,
-        mir_drops_elaborated_and_const_checked,
-        mir_for_ctfe,
-        mir_for_ctfe_of_const_arg,
-        optimized_mir,
-        is_mir_available,
-        is_ctfe_mir_available: |tcx, did| is_mir_available(tcx, did),
-        promoted_mir: |tcx, def_id| {
-            let def_id = def_id.expect_local();
-            if let Some(def) = ty::WithOptConstParam::try_lookup(def_id, tcx) {
-                tcx.promoted_mir_of_const_arg(def)
-            } else {
-                promoted_mir(tcx, ty::WithOptConstParam::unknown(def_id))
-            }
-        },
-        promoted_mir_of_const_arg: |tcx, (did, param_did)| {
-            promoted_mir(tcx, ty::WithOptConstParam { did, const_param_did: Some(param_did) })
-        },
-        ..*providers
-    };
-    coverage::query::provide(providers);
-}
-
-fn is_mir_available(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
-    let def_id = def_id.expect_local();
-    tcx.mir_keys(()).contains(&def_id)
-}
-
-/// Finds the full set of `DefId`s within the current crate that have
-/// MIR associated with them.
-fn mir_keys(tcx: TyCtxt<'_>, (): ()) -> FxHashSet<LocalDefId> {
-    let mut set = FxHashSet::default();
-
-    // All body-owners have MIR associated with them.
-    set.extend(tcx.body_owners());
-
-    // Additionally, tuple struct/variant constructors have MIR, but
-    // they don't have a BodyId, so we need to build them separately.
-    struct GatherCtors<'a, 'tcx> {
-        tcx: TyCtxt<'tcx>,
-        set: &'a mut FxHashSet<LocalDefId>,
-    }
-    impl<'a, 'tcx> Visitor<'tcx> for GatherCtors<'a, 'tcx> {
-        fn visit_variant_data(
-            &mut self,
-            v: &'tcx hir::VariantData<'tcx>,
-            _: Symbol,
-            _: &'tcx hir::Generics<'tcx>,
-            _: hir::HirId,
-            _: Span,
-        ) {
-            if let hir::VariantData::Tuple(_, hir_id) = *v {
-                self.set.insert(self.tcx.hir().local_def_id(hir_id));
-            }
-            intravisit::walk_struct_def(self, v)
-        }
-        type Map = intravisit::ErasedMap<'tcx>;
-        fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
-            NestedVisitorMap::None
-        }
-    }
-    tcx.hir()
-        .krate()
-        .visit_all_item_likes(&mut GatherCtors { tcx, set: &mut set }.as_deep_visitor());
-
-    set
-}
-
 /// Generates a default name for the pass based on the name of the
 /// type `T`.
 pub fn default_name<T: ?Sized>() -> Cow<'static, str> {
@@ -161,467 +24,3 @@ pub trait MirPass<'tcx> {
 
     fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>);
 }
-
-pub fn run_passes(
-    tcx: TyCtxt<'tcx>,
-    body: &mut Body<'tcx>,
-    mir_phase: MirPhase,
-    passes: &[&[&dyn MirPass<'tcx>]],
-) {
-    let phase_index = mir_phase.phase_index();
-    let validate = tcx.sess.opts.debugging_opts.validate_mir;
-
-    if body.phase >= mir_phase {
-        return;
-    }
-
-    if validate {
-        validate::Validator { when: format!("input to phase {:?}", mir_phase), mir_phase }
-            .run_pass(tcx, body);
-    }
-
-    let mut index = 0;
-    let mut run_pass = |pass: &dyn MirPass<'tcx>| {
-        let run_hooks = |body: &_, index, is_after| {
-            dump_mir::on_mir_pass(
-                tcx,
-                &format_args!("{:03}-{:03}", phase_index, index),
-                &pass.name(),
-                body,
-                is_after,
-            );
-        };
-        run_hooks(body, index, false);
-        pass.run_pass(tcx, body);
-        run_hooks(body, index, true);
-
-        if validate {
-            validate::Validator {
-                when: format!("after {} in phase {:?}", pass.name(), mir_phase),
-                mir_phase,
-            }
-            .run_pass(tcx, body);
-        }
-
-        index += 1;
-    };
-
-    for pass_group in passes {
-        for pass in *pass_group {
-            run_pass(*pass);
-        }
-    }
-
-    body.phase = mir_phase;
-
-    if mir_phase == MirPhase::Optimization {
-        validate::Validator { when: format!("end of phase {:?}", mir_phase), mir_phase }
-            .run_pass(tcx, body);
-    }
-}
-
-fn mir_const_qualif(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> ConstQualifs {
-    let const_kind = tcx.hir().body_const_context(def.did);
-
-    // No need to const-check a non-const `fn`.
-    if const_kind.is_none() {
-        return Default::default();
-    }
-
-    // N.B., this `borrow()` is guaranteed to be valid (i.e., the value
-    // cannot yet be stolen), because `mir_promoted()`, which steals
-    // from `mir_const(), forces this query to execute before
-    // performing the steal.
-    let body = &tcx.mir_const(def).borrow();
-
-    if body.return_ty().references_error() {
-        tcx.sess.delay_span_bug(body.span, "mir_const_qualif: MIR had errors");
-        return Default::default();
-    }
-
-    let ccx = check_consts::ConstCx { body, tcx, const_kind, param_env: tcx.param_env(def.did) };
-
-    let mut validator = check_consts::check::Checker::new(&ccx);
-    validator.check_body();
-
-    // We return the qualifs in the return place for every MIR body, even though it is only used
-    // when deciding to promote a reference to a `const` for now.
-    validator.qualifs_in_return_place()
-}
-
-/// Make MIR ready for const evaluation. This is run on all MIR, not just on consts!
-fn mir_const<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    def: ty::WithOptConstParam<LocalDefId>,
-) -> &'tcx Steal<Body<'tcx>> {
-    if let Some(def) = def.try_upgrade(tcx) {
-        return tcx.mir_const(def);
-    }
-
-    // Unsafety check uses the raw mir, so make sure it is run.
-    if !tcx.sess.opts.debugging_opts.thir_unsafeck {
-        if let Some(param_did) = def.const_param_did {
-            tcx.ensure().unsafety_check_result_for_const_arg((def.did, param_did));
-        } else {
-            tcx.ensure().unsafety_check_result(def.did);
-        }
-    }
-
-    let mut body = tcx.mir_built(def).steal();
-
-    util::dump_mir(tcx, None, "mir_map", &0, &body, |_, _| Ok(()));
-
-    run_passes(
-        tcx,
-        &mut body,
-        MirPhase::Const,
-        &[&[
-            // MIR-level lints.
-            &check_packed_ref::CheckPackedRef,
-            &check_const_item_mutation::CheckConstItemMutation,
-            &function_item_references::FunctionItemReferences,
-            // What we need to do constant evaluation.
-            &simplify::SimplifyCfg::new("initial"),
-            &rustc_peek::SanityCheck,
-        ]],
-    );
-    tcx.alloc_steal_mir(body)
-}
-
-/// Compute the main MIR body and the list of MIR bodies of the promoteds.
-fn mir_promoted(
-    tcx: TyCtxt<'tcx>,
-    def: ty::WithOptConstParam<LocalDefId>,
-) -> (&'tcx Steal<Body<'tcx>>, &'tcx Steal<IndexVec<Promoted, Body<'tcx>>>) {
-    if let Some(def) = def.try_upgrade(tcx) {
-        return tcx.mir_promoted(def);
-    }
-
-    // Ensure that we compute the `mir_const_qualif` for constants at
-    // this point, before we steal the mir-const result.
-    // Also this means promotion can rely on all const checks having been done.
-    let _ = tcx.mir_const_qualif_opt_const_arg(def);
-    let _ = tcx.mir_abstract_const_opt_const_arg(def.to_global());
-    let mut body = tcx.mir_const(def).steal();
-
-    let mut required_consts = Vec::new();
-    let mut required_consts_visitor = RequiredConstsVisitor::new(&mut required_consts);
-    for (bb, bb_data) in traversal::reverse_postorder(&body) {
-        required_consts_visitor.visit_basic_block_data(bb, bb_data);
-    }
-    body.required_consts = required_consts;
-
-    let promote_pass = promote_consts::PromoteTemps::default();
-    let promote: &[&dyn MirPass<'tcx>] = &[
-        // What we need to run borrowck etc.
-        &promote_pass,
-        &simplify::SimplifyCfg::new("promote-consts"),
-    ];
-
-    let opt_coverage: &[&dyn MirPass<'tcx>] =
-        if tcx.sess.instrument_coverage() { &[&coverage::InstrumentCoverage] } else { &[] };
-
-    run_passes(tcx, &mut body, MirPhase::ConstPromotion, &[promote, opt_coverage]);
-
-    let promoted = promote_pass.promoted_fragments.into_inner();
-    (tcx.alloc_steal_mir(body), tcx.alloc_steal_promoted(promoted))
-}
-
-/// Compute the MIR that is used during CTFE (and thus has no optimizations run on it)
-fn mir_for_ctfe<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId) -> &'tcx Body<'tcx> {
-    let did = def_id.expect_local();
-    if let Some(def) = ty::WithOptConstParam::try_lookup(did, tcx) {
-        tcx.mir_for_ctfe_of_const_arg(def)
-    } else {
-        tcx.arena.alloc(inner_mir_for_ctfe(tcx, ty::WithOptConstParam::unknown(did)))
-    }
-}
-
-/// Same as `mir_for_ctfe`, but used to get the MIR of a const generic parameter.
-/// The docs on `WithOptConstParam` explain this a bit more, but the TLDR is that
-/// we'd get cycle errors with `mir_for_ctfe`, because typeck would need to typeck
-/// the const parameter while type checking the main body, which in turn would try
-/// to type check the main body again.
-fn mir_for_ctfe_of_const_arg<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    (did, param_did): (LocalDefId, DefId),
-) -> &'tcx Body<'tcx> {
-    tcx.arena.alloc(inner_mir_for_ctfe(
-        tcx,
-        ty::WithOptConstParam { did, const_param_did: Some(param_did) },
-    ))
-}
-
-fn inner_mir_for_ctfe(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> Body<'_> {
-    // FIXME: don't duplicate this between the optimized_mir/mir_for_ctfe queries
-    if tcx.is_constructor(def.did.to_def_id()) {
-        // There's no reason to run all of the MIR passes on constructors when
-        // we can just output the MIR we want directly. This also saves const
-        // qualification and borrow checking the trouble of special casing
-        // constructors.
-        return shim::build_adt_ctor(tcx, def.did.to_def_id());
-    }
-
-    let context = tcx
-        .hir()
-        .body_const_context(def.did)
-        .expect("mir_for_ctfe should not be used for runtime functions");
-
-    let mut body = tcx.mir_drops_elaborated_and_const_checked(def).borrow().clone();
-
-    match context {
-        // Do not const prop functions, either they get executed at runtime or exported to metadata,
-        // so we run const prop on them, or they don't, in which case we const evaluate some control
-        // flow paths of the function and any errors in those paths will get emitted as const eval
-        // errors.
-        hir::ConstContext::ConstFn => {}
-        // Static items always get evaluated, so we can just let const eval see if any erroneous
-        // control flow paths get executed.
-        hir::ConstContext::Static(_) => {}
-        // Associated constants get const prop run so we detect common failure situations in the
-        // crate that defined the constant.
-        // Technically we want to not run on regular const items, but oli-obk doesn't know how to
-        // conveniently detect that at this point without looking at the HIR.
-        hir::ConstContext::Const => {
-            #[rustfmt::skip]
-            let optimizations: &[&dyn MirPass<'_>] = &[
-                &const_prop::ConstProp,
-            ];
-
-            #[rustfmt::skip]
-            run_passes(
-                tcx,
-                &mut body,
-                MirPhase::Optimization,
-                &[
-                    optimizations,
-                ],
-            );
-        }
-    }
-
-    debug_assert!(!body.has_free_regions(tcx), "Free regions in MIR for CTFE");
-
-    body
-}
-
-/// Obtain just the main MIR (no promoteds) and run some cleanups on it. This also runs
-/// mir borrowck *before* doing so in order to ensure that borrowck can be run and doesn't
-/// end up missing the source MIR due to stealing happening.
-fn mir_drops_elaborated_and_const_checked<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    def: ty::WithOptConstParam<LocalDefId>,
-) -> &'tcx Steal<Body<'tcx>> {
-    if let Some(def) = def.try_upgrade(tcx) {
-        return tcx.mir_drops_elaborated_and_const_checked(def);
-    }
-
-    // (Mir-)Borrowck uses `mir_promoted`, so we have to force it to
-    // execute before we can steal.
-    if let Some(param_did) = def.const_param_did {
-        tcx.ensure().mir_borrowck_const_arg((def.did, param_did));
-    } else {
-        tcx.ensure().mir_borrowck(def.did);
-    }
-
-    let hir_id = tcx.hir().local_def_id_to_hir_id(def.did);
-    use rustc_middle::hir::map::blocks::FnLikeNode;
-    let is_fn_like = FnLikeNode::from_node(tcx.hir().get(hir_id)).is_some();
-    if is_fn_like {
-        let did = def.did.to_def_id();
-        let def = ty::WithOptConstParam::unknown(did);
-
-        // Do not compute the mir call graph without said call graph actually being used.
-        if inline::is_enabled(tcx) {
-            let _ = tcx.mir_inliner_callees(ty::InstanceDef::Item(def));
-        }
-    }
-
-    let (body, _) = tcx.mir_promoted(def);
-    let mut body = body.steal();
-
-    run_post_borrowck_cleanup_passes(tcx, &mut body);
-    check_consts::post_drop_elaboration::check_live_drops(tcx, &body);
-    tcx.alloc_steal_mir(body)
-}
-
-/// After this series of passes, no lifetime analysis based on borrowing can be done.
-fn run_post_borrowck_cleanup_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
-    debug!("post_borrowck_cleanup({:?})", body.source.def_id());
-
-    let post_borrowck_cleanup: &[&dyn MirPass<'tcx>] = &[
-        // Remove all things only needed by analysis
-        &simplify_branches::SimplifyBranches::new("initial"),
-        &remove_noop_landing_pads::RemoveNoopLandingPads,
-        &cleanup_post_borrowck::CleanupNonCodegenStatements,
-        &simplify::SimplifyCfg::new("early-opt"),
-        // These next passes must be executed together
-        &add_call_guards::CriticalCallEdges,
-        &elaborate_drops::ElaborateDrops,
-        // This will remove extraneous landing pads which are no longer
-        // necessary as well as well as forcing any call in a non-unwinding
-        // function calling a possibly-unwinding function to abort the process.
-        &abort_unwinding_calls::AbortUnwindingCalls,
-        // AddMovesForPackedDrops needs to run after drop
-        // elaboration.
-        &add_moves_for_packed_drops::AddMovesForPackedDrops,
-        // `AddRetag` needs to run after `ElaborateDrops`. Otherwise it should run fairly late,
-        // but before optimizations begin.
-        &add_retag::AddRetag,
-        &lower_intrinsics::LowerIntrinsics,
-        &simplify::SimplifyCfg::new("elaborate-drops"),
-        // `Deaggregator` is conceptually part of MIR building, some backends rely on it happening
-        // and it can help optimizations.
-        &deaggregator::Deaggregator,
-    ];
-
-    run_passes(tcx, body, MirPhase::DropLowering, &[post_borrowck_cleanup]);
-}
-
-fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
-    let mir_opt_level = tcx.sess.mir_opt_level();
-
-    // Lowering generator control-flow and variables has to happen before we do anything else
-    // to them. We run some optimizations before that, because they may be harder to do on the state
-    // machine than on MIR with async primitives.
-    let optimizations_with_generators: &[&dyn MirPass<'tcx>] = &[
-        &lower_slice_len::LowerSliceLenCalls, // has to be done before inlining, otherwise actual call will be almost always inlined. Also simple, so can just do first
-        &unreachable_prop::UnreachablePropagation,
-        &uninhabited_enum_branching::UninhabitedEnumBranching,
-        &simplify::SimplifyCfg::new("after-uninhabited-enum-branching"),
-        &inline::Inline,
-        &generator::StateTransform,
-    ];
-
-    // Even if we don't do optimizations, we still have to lower generators for codegen.
-    let no_optimizations_with_generators: &[&dyn MirPass<'tcx>] = &[&generator::StateTransform];
-
-    // The main optimizations that we do on MIR.
-    let optimizations: &[&dyn MirPass<'tcx>] = &[
-        &remove_storage_markers::RemoveStorageMarkers,
-        &remove_zsts::RemoveZsts,
-        &const_goto::ConstGoto,
-        &remove_unneeded_drops::RemoveUnneededDrops,
-        &match_branches::MatchBranchSimplification,
-        // inst combine is after MatchBranchSimplification to clean up Ne(_1, false)
-        &multiple_return_terminators::MultipleReturnTerminators,
-        &instcombine::InstCombine,
-        &separate_const_switch::SeparateConstSwitch,
-        &const_prop::ConstProp,
-        &simplify_branches::SimplifyBranches::new("after-const-prop"),
-        &early_otherwise_branch::EarlyOtherwiseBranch,
-        &simplify_comparison_integral::SimplifyComparisonIntegral,
-        &simplify_try::SimplifyArmIdentity,
-        &simplify_try::SimplifyBranchSame,
-        &dest_prop::DestinationPropagation,
-        &simplify_branches::SimplifyBranches::new("final"),
-        &remove_noop_landing_pads::RemoveNoopLandingPads,
-        &simplify::SimplifyCfg::new("final"),
-        &nrvo::RenameReturnPlace,
-        &const_debuginfo::ConstDebugInfo,
-        &simplify::SimplifyLocals,
-        &multiple_return_terminators::MultipleReturnTerminators,
-        &deduplicate_blocks::DeduplicateBlocks,
-    ];
-
-    // Optimizations to run even if mir optimizations have been disabled.
-    let no_optimizations: &[&dyn MirPass<'tcx>] = &[
-        // FIXME(#70073): This pass is responsible for both optimization as well as some lints.
-        &const_prop::ConstProp,
-    ];
-
-    // Some cleanup necessary at least for LLVM and potentially other codegen backends.
-    let pre_codegen_cleanup: &[&dyn MirPass<'tcx>] = &[
-        &add_call_guards::CriticalCallEdges,
-        // Dump the end result for testing and debugging purposes.
-        &dump_mir::Marker("PreCodegen"),
-    ];
-
-    // End of pass declarations, now actually run the passes.
-    // Generator Lowering
-    #[rustfmt::skip]
-    run_passes(
-        tcx,
-        body,
-        MirPhase::GeneratorLowering,
-        &[
-            if mir_opt_level > 0 {
-                optimizations_with_generators
-            } else {
-                no_optimizations_with_generators
-            }
-        ],
-    );
-
-    // Main optimization passes
-    #[rustfmt::skip]
-    run_passes(
-        tcx,
-        body,
-        MirPhase::Optimization,
-        &[
-            if mir_opt_level > 0 { optimizations } else { no_optimizations },
-            pre_codegen_cleanup,
-        ],
-    );
-}
-
-/// Optimize the MIR and prepare it for codegen.
-fn optimized_mir<'tcx>(tcx: TyCtxt<'tcx>, did: DefId) -> &'tcx Body<'tcx> {
-    let did = did.expect_local();
-    assert_eq!(ty::WithOptConstParam::try_lookup(did, tcx), None);
-    tcx.arena.alloc(inner_optimized_mir(tcx, did))
-}
-
-fn inner_optimized_mir(tcx: TyCtxt<'_>, did: LocalDefId) -> Body<'_> {
-    if tcx.is_constructor(did.to_def_id()) {
-        // There's no reason to run all of the MIR passes on constructors when
-        // we can just output the MIR we want directly. This also saves const
-        // qualification and borrow checking the trouble of special casing
-        // constructors.
-        return shim::build_adt_ctor(tcx, did.to_def_id());
-    }
-
-    match tcx.hir().body_const_context(did) {
-        // Run the `mir_for_ctfe` query, which depends on `mir_drops_elaborated_and_const_checked`
-        // which we are going to steal below. Thus we need to run `mir_for_ctfe` first, so it
-        // computes and caches its result.
-        Some(hir::ConstContext::ConstFn) => tcx.ensure().mir_for_ctfe(did),
-        None => {}
-        Some(other) => panic!("do not use `optimized_mir` for constants: {:?}", other),
-    }
-    let mut body =
-        tcx.mir_drops_elaborated_and_const_checked(ty::WithOptConstParam::unknown(did)).steal();
-    run_optimization_passes(tcx, &mut body);
-
-    debug_assert!(!body.has_free_regions(tcx), "Free regions in optimized MIR");
-
-    body
-}
-
-/// Fetch all the promoteds of an item and prepare their MIR bodies to be ready for
-/// constant evaluation once all substitutions become known.
-fn promoted_mir<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    def: ty::WithOptConstParam<LocalDefId>,
-) -> &'tcx IndexVec<Promoted, Body<'tcx>> {
-    if tcx.is_constructor(def.did.to_def_id()) {
-        return tcx.arena.alloc(IndexVec::new());
-    }
-
-    if let Some(param_did) = def.const_param_did {
-        tcx.ensure().mir_borrowck_const_arg((def.did, param_did));
-    } else {
-        tcx.ensure().mir_borrowck(def.did);
-    }
-    let (_, promoted) = tcx.mir_promoted(def);
-    let mut promoted = promoted.steal();
-
-    for body in &mut promoted {
-        run_post_borrowck_cleanup_passes(tcx, body);
-    }
-
-    debug_assert!(!promoted.has_free_regions(tcx), "Free regions in promoted MIR");
-
-    tcx.arena.alloc(promoted)
-}