diff options
Diffstat (limited to 'compiler/rustc_mir_transform/src/lib.rs')
| -rw-r--r-- | compiler/rustc_mir_transform/src/lib.rs | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/compiler/rustc_mir_transform/src/lib.rs b/compiler/rustc_mir_transform/src/lib.rs index bf798adee..c0a09b7a7 100644 --- a/compiler/rustc_mir_transform/src/lib.rs +++ b/compiler/rustc_mir_transform/src/lib.rs @@ -2,6 +2,7 @@ #![deny(rustc::untranslatable_diagnostic)] #![deny(rustc::diagnostic_outside_of_impl)] #![feature(box_patterns)] +#![feature(decl_macro)] #![feature(is_sorted)] #![feature(let_chains)] #![feature(map_try_insert)] @@ -30,9 +31,9 @@ use rustc_hir::intravisit::{self, Visitor}; use rustc_index::IndexVec; use rustc_middle::mir::visit::Visitor as _; use rustc_middle::mir::{ - traversal, AnalysisPhase, Body, CallSource, ClearCrossCrate, ConstQualifs, Constant, LocalDecl, - MirPass, MirPhase, Operand, Place, ProjectionElem, Promoted, RuntimePhase, Rvalue, SourceInfo, - Statement, StatementKind, TerminatorKind, START_BLOCK, + traversal, AnalysisPhase, Body, CallSource, ClearCrossCrate, ConstOperand, ConstQualifs, + LocalDecl, MirPass, MirPhase, Operand, Place, ProjectionElem, Promoted, RuntimePhase, Rvalue, + SourceInfo, Statement, StatementKind, TerminatorKind, START_BLOCK, }; use rustc_middle::query::Providers; use rustc_middle::ty::{self, TyCtxt, TypeVisitableExt}; @@ -53,6 +54,7 @@ mod check_packed_ref; pub mod check_unsafety; mod remove_place_mention; // This pass is public to allow external drivers to perform MIR cleanup +mod add_subtyping_projections; pub mod cleanup_post_borrowck; mod const_debuginfo; mod const_goto; @@ -75,6 +77,7 @@ mod errors; mod ffi_unwind_calls; mod function_item_references; mod generator; +mod gvn; pub mod inline; mod instsimplify; mod large_enums; @@ -148,14 +151,14 @@ fn remap_mir_for_const_eval_select<'tcx>( let terminator = bb.terminator.as_mut().expect("invalid terminator"); match terminator.kind { TerminatorKind::Call { - func: Operand::Constant(box Constant { ref literal, .. }), + func: Operand::Constant(box ConstOperand { ref const_, .. }), ref mut args, destination, target, unwind, fn_span, .. - } if let ty::FnDef(def_id, _) = *literal.ty().kind() + } if let ty::FnDef(def_id, _) = *const_.ty().kind() && tcx.item_name(def_id) == sym::const_eval_select && tcx.is_intrinsic(def_id) => { @@ -342,7 +345,7 @@ fn inner_mir_for_ctfe(tcx: TyCtxt<'_>, def: LocalDefId) -> Body<'_> { let body = match tcx.hir().body_const_context(def) { // consts and statics do not have `optimized_mir`, so we can steal the body instead of // cloning it. - Some(hir::ConstContext::Const | hir::ConstContext::Static(_)) => body.steal(), + Some(hir::ConstContext::Const { .. } | hir::ConstContext::Static(_)) => body.steal(), Some(hir::ConstContext::ConstFn) => body.borrow().clone(), None => bug!("`mir_for_ctfe` called on non-const {def:?}"), }; @@ -357,9 +360,7 @@ fn inner_mir_for_ctfe(tcx: TyCtxt<'_>, def: LocalDefId) -> Body<'_> { /// 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: TyCtxt<'_>, def: LocalDefId) -> &Steal<Body<'_>> { - if tcx.sess.opts.unstable_opts.drop_tracking_mir - && let DefKind::Generator = tcx.def_kind(def) - { + if let DefKind::Generator = tcx.def_kind(def) { tcx.ensure_with_value().mir_generator_witnesses(def); } let mir_borrowck = tcx.mir_borrowck(def); @@ -480,6 +481,8 @@ fn run_runtime_lowering_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) { let passes: &[&dyn MirPass<'tcx>] = &[ // These next passes must be executed together &add_call_guards::CriticalCallEdges, + &reveal_all::RevealAll, // has to be done before drop elaboration, since we need to drop opaque types, too. + &add_subtyping_projections::Subtyper, // calling this after reveal_all ensures that we don't deal with opaque types &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 @@ -526,7 +529,6 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) { body, &[ &check_alignment::CheckAlignment, - &reveal_all::RevealAll, // has to be done before inlining, since inlined code is in RevealAll mode. &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, @@ -550,6 +552,7 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) { // latter pass will leverage the created opportunities. &separate_const_switch::SeparateConstSwitch, &const_prop::ConstProp, + &gvn::GVN, &dataflow_const_prop::DataflowConstProp, // // Const-prop runs unconditionally, but doesn't mutate the MIR at mir-opt-level=0. @@ -605,6 +608,11 @@ fn inner_optimized_mir(tcx: TyCtxt<'_>, did: LocalDefId) -> Body<'_> { let body = tcx.mir_drops_elaborated_and_const_checked(did).steal(); let mut body = remap_mir_for_const_eval_select(tcx, body, hir::Constness::NotConst); debug!("body: {:#?}", body); + + if body.tainted_by_errors.is_some() { + return body; + } + run_optimization_passes(tcx, &mut body); body |