// option. This file may not be copied, modified, or distributed
// except according to those terms.
-pub mod simplify_cfg;
+use build;
+use rustc::hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
+use rustc::mir::{Mir, Promoted};
+use rustc::ty::TyCtxt;
+use rustc::ty::maps::Providers;
+use rustc::ty::steal::Steal;
+use rustc::hir;
+use rustc::hir::intravisit::{self, Visitor, NestedVisitorMap};
+use rustc::util::nodemap::DefIdSet;
+use std::borrow::Cow;
+use std::rc::Rc;
+use syntax::ast;
+use syntax_pos::Span;
+
+pub mod add_validation;
+pub mod clean_end_regions;
+pub mod check_unsafety;
+pub mod simplify_branches;
+pub mod simplify;
pub mod erase_regions;
-mod util;
+pub mod no_landing_pads;
+pub mod type_check;
+pub mod rustc_peek;
+pub mod elaborate_drops;
+pub mod add_call_guards;
+pub mod promote_consts;
+pub mod qualify_consts;
+pub mod dump_mir;
+pub mod deaggregator;
+pub mod instcombine;
+pub mod copy_prop;
+pub mod generator;
+pub mod inline;
+pub mod nll;
+
+pub(crate) fn provide(providers: &mut Providers) {
+ self::qualify_consts::provide(providers);
+ self::check_unsafety::provide(providers);
+ *providers = Providers {
+ mir_keys,
+ mir_built,
+ mir_const,
+ mir_validated,
+ optimized_mir,
+ is_mir_available,
+ ..*providers
+ };
+}
+
+fn is_mir_available<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> bool {
+ tcx.mir_keys(def_id.krate).contains(&def_id)
+}
+
+/// Finds the full set of def-ids within the current crate that have
+/// MIR associated with them.
+fn mir_keys<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, krate: CrateNum)
+ -> Rc<DefIdSet> {
+ assert_eq!(krate, LOCAL_CRATE);
+
+ let mut set = DefIdSet();
+
+ // 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: 'a> {
+ tcx: TyCtxt<'a, 'tcx, 'tcx>,
+ set: &'a mut DefIdSet,
+ }
+ impl<'a, 'tcx> Visitor<'tcx> for GatherCtors<'a, 'tcx> {
+ fn visit_variant_data(&mut self,
+ v: &'tcx hir::VariantData,
+ _: ast::Name,
+ _: &'tcx hir::Generics,
+ _: ast::NodeId,
+ _: Span) {
+ if let hir::VariantData::Tuple(_, node_id) = *v {
+ self.set.insert(self.tcx.hir.local_def_id(node_id));
+ }
+ intravisit::walk_struct_def(self, v)
+ }
+ fn nested_visit_map<'b>(&'b mut self) -> NestedVisitorMap<'b, 'tcx> {
+ NestedVisitorMap::None
+ }
+ }
+ tcx.hir.krate().visit_all_item_likes(&mut GatherCtors {
+ tcx,
+ set: &mut set,
+ }.as_deep_visitor());
+
+ Rc::new(set)
+}
+
+fn mir_built<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> &'tcx Steal<Mir<'tcx>> {
+ let mir = build::mir_build(tcx, def_id);
+ tcx.alloc_steal_mir(mir)
+}
+
+/// Where a specific Mir comes from.
+#[derive(Debug, Copy, Clone)]
+pub struct MirSource {
+ pub def_id: DefId,
+
+ /// If `Some`, this is a promoted rvalue within the parent function.
+ pub promoted: Option<Promoted>,
+}
+
+impl MirSource {
+ pub fn item(def_id: DefId) -> Self {
+ MirSource {
+ def_id,
+ promoted: None
+ }
+ }
+}
+
+/// Generates a default name for the pass based on the name of the
+/// type `T`.
+pub fn default_name<T: ?Sized>() -> Cow<'static, str> {
+ let name = unsafe { ::std::intrinsics::type_name::<T>() };
+ if let Some(tail) = name.rfind(":") {
+ Cow::from(&name[tail+1..])
+ } else {
+ Cow::from(name)
+ }
+}
+
+/// A streamlined trait that you can implement to create a pass; the
+/// pass will be named after the type, and it will consist of a main
+/// loop that goes over each available MIR and applies `run_pass`.
+pub trait MirPass {
+ fn name<'a>(&'a self) -> Cow<'a, str> {
+ default_name::<Self>()
+ }
+
+ fn run_pass<'a, 'tcx>(&self,
+ tcx: TyCtxt<'a, 'tcx, 'tcx>,
+ source: MirSource,
+ mir: &mut Mir<'tcx>);
+}
+
+pub macro run_passes($tcx:ident, $mir:ident, $def_id:ident, $suite_index:expr; $($pass:expr,)*) {{
+ let suite_index: usize = $suite_index;
+ let run_passes = |mir: &mut _, promoted| {
+ let source = MirSource {
+ def_id: $def_id,
+ promoted
+ };
+ let mut index = 0;
+ let mut run_pass = |pass: &MirPass| {
+ let run_hooks = |mir: &_, index, is_after| {
+ dump_mir::on_mir_pass($tcx, &format_args!("{:03}-{:03}", suite_index, index),
+ &pass.name(), source, mir, is_after);
+ };
+ run_hooks(mir, index, false);
+ pass.run_pass($tcx, source, mir);
+ run_hooks(mir, index, true);
+
+ index += 1;
+ };
+ $(run_pass(&$pass);)*
+ };
+
+ run_passes(&mut $mir, None);
+
+ for (index, promoted_mir) in $mir.promoted.iter_enumerated_mut() {
+ run_passes(promoted_mir, Some(index));
+
+ // Let's make sure we don't miss any nested instances
+ assert!(promoted_mir.promoted.is_empty());
+ }
+}}
+
+fn mir_const<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> &'tcx Steal<Mir<'tcx>> {
+ // Unsafety check uses the raw mir, so make sure it is run
+ let _ = tcx.unsafety_check_result(def_id);
+
+ let mut mir = tcx.mir_built(def_id).steal();
+ run_passes![tcx, mir, def_id, 0;
+ // Remove all `EndRegion` statements that are not involved in borrows.
+ clean_end_regions::CleanEndRegions,
+
+ // What we need to do constant evaluation.
+ simplify::SimplifyCfg::new("initial"),
+ type_check::TypeckMir,
+ rustc_peek::SanityCheck,
+ ];
+ tcx.alloc_steal_mir(mir)
+}
+
+fn mir_validated<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> &'tcx Steal<Mir<'tcx>> {
+ let node_id = tcx.hir.as_local_node_id(def_id).unwrap();
+ if let hir::BodyOwnerKind::Const = tcx.hir.body_owner_kind(node_id) {
+ // Ensure that we compute the `mir_const_qualif` for constants at
+ // this point, before we steal the mir-const result.
+ let _ = tcx.mir_const_qualif(def_id);
+ }
+
+ let mut mir = tcx.mir_const(def_id).steal();
+ run_passes![tcx, mir, def_id, 1;
+ // What we need to run borrowck etc.
+ qualify_consts::QualifyAndPromoteConstants,
+ simplify::SimplifyCfg::new("qualify-consts"),
+ ];
+ tcx.alloc_steal_mir(mir)
+}
+
+fn optimized_mir<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> &'tcx Mir<'tcx> {
+ // (Mir-)Borrowck uses `mir_validated`, so we have to force it to
+ // execute before we can steal.
+ let _ = tcx.mir_borrowck(def_id);
+ let _ = tcx.borrowck(def_id);
+
+ let mut mir = tcx.mir_validated(def_id).steal();
+ run_passes![tcx, mir, def_id, 2;
+ no_landing_pads::NoLandingPads,
+ simplify_branches::SimplifyBranches::new("initial"),
+
+ // These next passes must be executed together
+ add_call_guards::CriticalCallEdges,
+ elaborate_drops::ElaborateDrops,
+ no_landing_pads::NoLandingPads,
+ // AddValidation needs to run after ElaborateDrops and before EraseRegions, and it needs
+ // an AllCallEdges pass right before it.
+ add_call_guards::AllCallEdges,
+ add_validation::AddValidation,
+ simplify::SimplifyCfg::new("elaborate-drops"),
+ // No lifetime analysis based on borrowing can be done from here on out.
+
+ // From here on out, regions are gone.
+ erase_regions::EraseRegions,
-use rustc::mir::repr::Mir;
+ // Optimizations begin.
+ inline::Inline,
+ instcombine::InstCombine,
+ deaggregator::Deaggregator,
+ copy_prop::CopyPropagation,
+ simplify::SimplifyLocals,
-pub trait MirPass<'tcx> {
- fn run_on_mir(&mut self, mir: &mut Mir<'tcx>);
+ generator::StateTransform,
+ add_call_guards::CriticalCallEdges,
+ dump_mir::Marker("PreTrans"),
+ ];
+ tcx.alloc_mir(mir)
}
projects / rustc.git / blobdiff