rustc: use monomorphic const_eval for cross-crate enum discriminants.
This commit is contained in:
parent
63064ec190
commit
6dc21b71cf
14 changed files with 139 additions and 149 deletions
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@ -1660,7 +1660,7 @@ impl<'a, 'gcx, 'tcx> AdtDef {
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self.variants.iter().map(move |v| {
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let mut discr = prev_discr.map_or(initial, |d| d.wrap_incr());
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if let VariantDiscr::Explicit(expr_did) = v.discr {
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match tcx.maps.monomorphic_const_eval.borrow()[&expr_did] {
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match queries::monomorphic_const_eval::get(tcx, DUMMY_SP, expr_did) {
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Ok(ConstVal::Integral(v)) => {
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discr = v;
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}
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@ -1673,6 +1673,51 @@ impl<'a, 'gcx, 'tcx> AdtDef {
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})
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}
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/// Compute the discriminant value used by a specific variant.
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/// Unlike `discriminants`, this is (amortized) constant-time,
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/// only doing at most one query for evaluating an explicit
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/// discriminant (the last one before the requested variant),
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/// assuming there are no constant-evaluation errors there.
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pub fn discriminant_for_variant(&self,
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tcx: TyCtxt<'a, 'gcx, 'tcx>,
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variant_index: usize)
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-> ConstInt {
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let repr_type = self.repr.discr_type();
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let mut explicit_value = repr_type.initial_discriminant(tcx.global_tcx());
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let mut explicit_index = variant_index;
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loop {
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match self.variants[explicit_index].discr {
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ty::VariantDiscr::Relative(0) => break,
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ty::VariantDiscr::Relative(distance) => {
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explicit_index -= distance;
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}
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ty::VariantDiscr::Explicit(expr_did) => {
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match queries::monomorphic_const_eval::get(tcx, DUMMY_SP, expr_did) {
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Ok(ConstVal::Integral(v)) => {
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explicit_value = v;
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break;
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}
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_ => {
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explicit_index -= 1;
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}
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}
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}
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}
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}
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let discr = explicit_value.to_u128_unchecked()
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.wrapping_add((variant_index - explicit_index) as u128);
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match repr_type {
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attr::UnsignedInt(ty) => {
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ConstInt::new_unsigned_truncating(discr, ty,
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tcx.sess.target.uint_type)
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}
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attr::SignedInt(ty) => {
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ConstInt::new_signed_truncating(discr as i128, ty,
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tcx.sess.target.int_type)
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}
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}
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}
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pub fn destructor(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Destructor> {
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queries::adt_destructor::get(tcx, DUMMY_SP, self.did)
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}
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@ -804,10 +804,13 @@ pub fn provide(providers: &mut Providers) {
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fn monomorphic_const_eval<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
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def_id: DefId)
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-> EvalResult<'tcx> {
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ty::queries::mir_const_qualif::get(tcx, DUMMY_SP, def_id);
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let cx = ConstContext::with_tables(tcx, tcx.item_tables(def_id));
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let id = tcx.hir.as_local_node_id(def_id).unwrap();
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let body = tcx.hir.body_owned_by(id);
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cx.eval(&tcx.hir.body(body).value)
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let body = if let Some(id) = tcx.hir.as_local_node_id(def_id) {
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ty::queries::mir_const_qualif::get(tcx, DUMMY_SP, def_id);
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tcx.hir.body(tcx.hir.body_owned_by(id))
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} else {
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tcx.sess.cstore.maybe_get_item_body(tcx, def_id).unwrap()
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};
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cx.eval(&body.value)
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}
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@ -900,6 +900,8 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
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let mut extern_providers = ty::maps::Providers::default();
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cstore::provide(&mut extern_providers);
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ty::provide_extern(&mut extern_providers);
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// FIXME(eddyb) get rid of this once we replace const_eval with miri.
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rustc_const_eval::provide(&mut extern_providers);
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TyCtxt::create_and_enter(sess,
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local_providers,
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@ -266,6 +266,17 @@ impl<'a, 'tcx, 'm> intravisit::Visitor<'tcx> for DirtyCleanMetadataVisitor<'a, '
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intravisit::walk_item(self, item);
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}
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fn visit_variant(&mut self,
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variant: &'tcx hir::Variant,
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generics: &'tcx hir::Generics,
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parent_id: ast::NodeId) {
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if let Some(e) = variant.node.disr_expr {
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self.check_item(e.node_id, variant.span);
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}
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intravisit::walk_variant(self, variant, generics, parent_id);
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}
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fn visit_variant_data(&mut self,
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variant_data: &'tcx hir::VariantData,
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_: ast::Name,
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@ -511,11 +511,7 @@ impl<'a, 'tcx> CrateMetadata {
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def
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}
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fn get_variant(&self,
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item: &Entry<'tcx>,
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index: DefIndex,
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tcx: TyCtxt<'a, 'tcx, 'tcx>)
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-> (ty::VariantDef, Option<DefIndex>) {
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fn get_variant(&self, item: &Entry, index: DefIndex) -> ty::VariantDef {
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let data = match item.kind {
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EntryKind::Variant(data) |
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EntryKind::Struct(data, _) |
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@ -523,13 +519,7 @@ impl<'a, 'tcx> CrateMetadata {
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_ => bug!(),
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};
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if let ty::VariantDiscr::Explicit(def_id) = data.discr {
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// The original crate wouldn't have compiled if this is missing.
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let result = Ok(data.evaluated_discr.unwrap());
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tcx.maps.monomorphic_const_eval.borrow_mut().insert(def_id, result);
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}
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(ty::VariantDef {
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ty::VariantDef {
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did: self.local_def_id(data.struct_ctor.unwrap_or(index)),
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name: self.item_name(index),
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fields: item.children.decode(self).map(|index| {
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@ -542,7 +532,7 @@ impl<'a, 'tcx> CrateMetadata {
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}).collect(),
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discr: data.discr,
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ctor_kind: data.ctor_kind,
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}, data.struct_ctor)
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}
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}
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pub fn get_adt_def(&self,
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@ -561,15 +551,11 @@ impl<'a, 'tcx> CrateMetadata {
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item.children
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.decode(self)
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.map(|index| {
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let (variant, struct_ctor) =
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self.get_variant(&self.entry(index), index, tcx);
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assert_eq!(struct_ctor, None);
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variant
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self.get_variant(&self.entry(index), index)
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})
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.collect()
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} else {
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let (variant, _struct_ctor) = self.get_variant(&item, item_id, tcx);
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vec![variant]
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vec![self.get_variant(&item, item_id)]
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};
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let (kind, repr) = match item.kind {
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EntryKind::Enum(repr) => (ty::AdtKind::Enum, repr),
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@ -269,12 +269,6 @@ impl<'a, 'b: 'a, 'tcx: 'b> EntryBuilder<'a, 'b, 'tcx> {
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let data = VariantData {
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ctor_kind: variant.ctor_kind,
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discr: variant.discr,
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evaluated_discr: match variant.discr {
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ty::VariantDiscr::Explicit(def_id) => {
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ty::queries::monomorphic_const_eval::get(tcx, DUMMY_SP, def_id).ok()
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}
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ty::VariantDiscr::Relative(_) => None
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},
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struct_ctor: None,
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};
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@ -408,7 +402,6 @@ impl<'a, 'b: 'a, 'tcx: 'b> EntryBuilder<'a, 'b, 'tcx> {
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let data = VariantData {
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ctor_kind: variant.ctor_kind,
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discr: variant.discr,
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evaluated_discr: None,
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struct_ctor: Some(def_id.index),
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};
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@ -697,7 +690,6 @@ impl<'a, 'b: 'a, 'tcx: 'b> EntryBuilder<'a, 'b, 'tcx> {
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EntryKind::Struct(self.lazy(&VariantData {
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ctor_kind: variant.ctor_kind,
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discr: variant.discr,
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evaluated_discr: None,
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struct_ctor: struct_ctor,
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}), repr_options)
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}
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@ -708,7 +700,6 @@ impl<'a, 'b: 'a, 'tcx: 'b> EntryBuilder<'a, 'b, 'tcx> {
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EntryKind::Union(self.lazy(&VariantData {
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ctor_kind: variant.ctor_kind,
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discr: variant.discr,
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evaluated_discr: None,
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struct_ctor: None,
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}), repr_options)
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}
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@ -1037,6 +1028,17 @@ impl<'a, 'b, 'tcx> Visitor<'tcx> for EncodeVisitor<'a, 'b, 'tcx> {
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EntryBuilder::encode_info_for_foreign_item,
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(def_id, ni));
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}
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fn visit_variant(&mut self,
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v: &'tcx hir::Variant,
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g: &'tcx hir::Generics,
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id: ast::NodeId) {
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intravisit::walk_variant(self, v, g, id);
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if let Some(discr) = v.node.disr_expr {
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let def_id = self.index.tcx.hir.body_owner_def_id(discr);
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self.index.record(def_id, EntryBuilder::encode_info_for_embedded_const, def_id);
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}
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}
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fn visit_generics(&mut self, generics: &'tcx hir::Generics) {
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intravisit::walk_generics(self, generics);
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self.index.encode_info_for_generics(generics);
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@ -1160,6 +1162,32 @@ impl<'a, 'b: 'a, 'tcx: 'b> EntryBuilder<'a, 'b, 'tcx> {
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}
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}
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fn encode_info_for_embedded_const(&mut self, def_id: DefId) -> Entry<'tcx> {
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debug!("EntryBuilder::encode_info_for_embedded_const({:?})", def_id);
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let tcx = self.tcx;
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let id = tcx.hir.as_local_node_id(def_id).unwrap();
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let body = tcx.hir.body_owned_by(id);
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Entry {
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kind: EntryKind::Const(ty::queries::mir_const_qualif::get(tcx, DUMMY_SP, def_id)),
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visibility: self.lazy(&ty::Visibility::Public),
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span: self.lazy(&tcx.def_span(def_id)),
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attributes: LazySeq::empty(),
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children: LazySeq::empty(),
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stability: None,
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deprecation: None,
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ty: Some(self.encode_item_type(def_id)),
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inherent_impls: LazySeq::empty(),
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variances: LazySeq::empty(),
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generics: Some(self.encode_generics(def_id)),
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predicates: Some(self.encode_predicates(def_id)),
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ast: Some(self.encode_body(body)),
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mir: self.encode_mir(def_id),
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}
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}
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fn encode_attributes(&mut self, attrs: &[ast::Attribute]) -> LazySeq<ast::Attribute> {
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// NOTE: This must use lazy_seq_from_slice(), not lazy_seq() because
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// we really on the HashStable specialization for [Attribute]
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@ -15,7 +15,6 @@ use rustc::hir;
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use rustc::hir::def::{self, CtorKind};
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use rustc::hir::def_id::{DefIndex, DefId};
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use rustc::ich::StableHashingContext;
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use rustc::middle::const_val::ConstVal;
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use rustc::middle::cstore::{DepKind, LinkagePreference, NativeLibrary};
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use rustc::middle::lang_items;
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use rustc::mir;
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@ -271,9 +270,9 @@ pub enum EntryKind<'tcx> {
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Type,
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Enum(ReprOptions),
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Field,
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Variant(Lazy<VariantData<'tcx>>),
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Struct(Lazy<VariantData<'tcx>>, ReprOptions),
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Union(Lazy<VariantData<'tcx>>, ReprOptions),
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Variant(Lazy<VariantData>),
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Struct(Lazy<VariantData>, ReprOptions),
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Union(Lazy<VariantData>, ReprOptions),
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Fn(Lazy<FnData>),
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ForeignFn(Lazy<FnData>),
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Mod(Lazy<ModData>),
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@ -374,20 +373,18 @@ pub struct FnData {
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impl_stable_hash_for!(struct FnData { constness, arg_names });
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#[derive(RustcEncodable, RustcDecodable)]
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pub struct VariantData<'tcx> {
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pub struct VariantData {
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pub ctor_kind: CtorKind,
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pub discr: ty::VariantDiscr,
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pub evaluated_discr: Option<ConstVal<'tcx>>,
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/// If this is a struct's only variant, this
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/// is the index of the "struct ctor" item.
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pub struct_ctor: Option<DefIndex>,
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}
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impl_stable_hash_for!(struct VariantData<'tcx> {
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impl_stable_hash_for!(struct VariantData {
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ctor_kind,
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discr,
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evaluated_discr,
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struct_ctor
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});
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@ -41,8 +41,6 @@
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//! used unboxed and any field can have pointers (including mutable)
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//! taken to it, implementing them for Rust seems difficult.
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use super::Disr;
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use std;
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use llvm::{ValueRef, True, IntEQ, IntNE};
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@ -347,31 +345,31 @@ fn load_discr(bcx: &Builder, ity: layout::Integer, ptr: ValueRef,
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/// Set the discriminant for a new value of the given case of the given
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/// representation.
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pub fn trans_set_discr<'a, 'tcx>(bcx: &Builder<'a, 'tcx>, t: Ty<'tcx>, val: ValueRef, to: Disr) {
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pub fn trans_set_discr<'a, 'tcx>(bcx: &Builder<'a, 'tcx>, t: Ty<'tcx>, val: ValueRef, to: u64) {
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let l = bcx.ccx.layout_of(t);
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match *l {
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layout::CEnum{ discr, min, max, .. } => {
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assert_discr_in_range(Disr(min), Disr(max), to);
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bcx.store(C_integral(Type::from_integer(bcx.ccx, discr), to.0, true),
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assert_discr_in_range(min, max, to);
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bcx.store(C_integral(Type::from_integer(bcx.ccx, discr), to, true),
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val, None);
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}
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layout::General{ discr, .. } => {
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bcx.store(C_integral(Type::from_integer(bcx.ccx, discr), to.0, true),
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bcx.store(C_integral(Type::from_integer(bcx.ccx, discr), to, true),
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bcx.struct_gep(val, 0), None);
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}
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layout::Univariant { .. }
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| layout::UntaggedUnion { .. }
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| layout::Vector { .. } => {
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assert_eq!(to, Disr(0));
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assert_eq!(to, 0);
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}
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layout::RawNullablePointer { nndiscr, .. } => {
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if to.0 != nndiscr {
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if to != nndiscr {
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let llptrty = val_ty(val).element_type();
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bcx.store(C_null(llptrty), val, None);
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}
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}
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layout::StructWrappedNullablePointer { nndiscr, ref discrfield, ref nonnull, .. } => {
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if to.0 != nndiscr {
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if to != nndiscr {
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if target_sets_discr_via_memset(bcx) {
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// Issue #34427: As workaround for LLVM bug on
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// ARM, use memset of 0 on whole struct rather
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@ -397,7 +395,7 @@ fn target_sets_discr_via_memset<'a, 'tcx>(bcx: &Builder<'a, 'tcx>) -> bool {
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bcx.sess().target.target.arch == "arm" || bcx.sess().target.target.arch == "aarch64"
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}
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pub fn assert_discr_in_range(min: Disr, max: Disr, discr: Disr) {
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pub fn assert_discr_in_range<D: PartialOrd>(min: D, max: D, discr: D) {
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if min <= max {
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assert!(min <= discr && discr <= max)
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} else {
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@ -415,7 +413,7 @@ fn roundup(x: u64, a: u32) -> u64 { let a = a as u64; ((x + (a - 1)) / a) * a }
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/// (Not to be confused with `common::const_get_elt`, which operates on
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/// raw LLVM-level structs and arrays.)
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pub fn const_get_field<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, t: Ty<'tcx>,
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val: ValueRef, _discr: Disr,
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val: ValueRef,
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ix: usize) -> ValueRef {
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let l = ccx.layout_of(t);
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match *l {
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@ -1,82 +0,0 @@
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// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use rustc::middle::const_val::ConstVal;
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use rustc::ty::{self, TyCtxt};
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use rustc_const_math::ConstInt;
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#[derive(Debug, Eq, PartialEq, Copy, Clone)]
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pub struct Disr(pub u64);
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impl Disr {
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pub fn for_variant(tcx: TyCtxt,
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def: &ty::AdtDef,
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variant_index: usize) -> Self {
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let mut explicit_index = variant_index;
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let mut explicit_value = Disr(0);
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loop {
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match def.variants[explicit_index].discr {
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ty::VariantDiscr::Relative(0) => break,
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ty::VariantDiscr::Relative(distance) => {
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explicit_index -= distance;
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}
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ty::VariantDiscr::Explicit(expr_did) => {
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||||
match tcx.maps.monomorphic_const_eval.borrow()[&expr_did] {
|
||||
Ok(ConstVal::Integral(v)) => {
|
||||
explicit_value = Disr::from(v);
|
||||
break;
|
||||
}
|
||||
_ => {
|
||||
explicit_index -= 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
let distance = variant_index - explicit_index;
|
||||
explicit_value.wrapping_add(Disr::from(distance))
|
||||
}
|
||||
|
||||
pub fn wrapping_add(self, other: Self) -> Self {
|
||||
Disr(self.0.wrapping_add(other.0))
|
||||
}
|
||||
}
|
||||
|
||||
impl ::std::ops::BitAnd for Disr {
|
||||
type Output = Disr;
|
||||
fn bitand(self, other: Self) -> Self {
|
||||
Disr(self.0 & other.0)
|
||||
}
|
||||
}
|
||||
|
||||
impl From<ConstInt> for Disr {
|
||||
fn from(i: ConstInt) -> Disr {
|
||||
// FIXME: what if discr has 128 bit discr?
|
||||
Disr(i.to_u128_unchecked() as u64)
|
||||
}
|
||||
}
|
||||
|
||||
impl From<usize> for Disr {
|
||||
fn from(i: usize) -> Disr {
|
||||
Disr(i as u64)
|
||||
}
|
||||
}
|
||||
|
||||
impl PartialOrd for Disr {
|
||||
fn partial_cmp(&self, other: &Disr) -> Option<::std::cmp::Ordering> {
|
||||
self.0.partial_cmp(&other.0)
|
||||
}
|
||||
}
|
||||
|
||||
impl Ord for Disr {
|
||||
fn cmp(&self, other: &Disr) -> ::std::cmp::Ordering {
|
||||
self.0.cmp(&other.0)
|
||||
}
|
||||
}
|
|
@ -67,7 +67,6 @@ pub use rustc::lint;
|
|||
pub use rustc::util;
|
||||
|
||||
pub use base::trans_crate;
|
||||
pub use disr::Disr;
|
||||
|
||||
pub mod back {
|
||||
pub use rustc::hir::svh;
|
||||
|
@ -118,7 +117,6 @@ mod consts;
|
|||
mod context;
|
||||
mod debuginfo;
|
||||
mod declare;
|
||||
mod disr;
|
||||
mod glue;
|
||||
mod intrinsic;
|
||||
mod machine;
|
||||
|
|
|
@ -22,7 +22,7 @@ use rustc::ty::layout::{self, LayoutTyper};
|
|||
use rustc::ty::cast::{CastTy, IntTy};
|
||||
use rustc::ty::subst::{Kind, Substs, Subst};
|
||||
use rustc_data_structures::indexed_vec::{Idx, IndexVec};
|
||||
use {abi, adt, base, Disr, machine};
|
||||
use {abi, adt, base, machine};
|
||||
use callee;
|
||||
use builder::Builder;
|
||||
use common::{self, CrateContext, const_get_elt, val_ty};
|
||||
|
@ -428,7 +428,7 @@ impl<'a, 'tcx> MirConstContext<'a, 'tcx> {
|
|||
}
|
||||
mir::ProjectionElem::Field(ref field, _) => {
|
||||
let llprojected = adt::const_get_field(self.ccx, tr_base.ty, base.llval,
|
||||
Disr(0), field.index());
|
||||
field.index());
|
||||
let llextra = if is_sized {
|
||||
ptr::null_mut()
|
||||
} else {
|
||||
|
@ -987,13 +987,14 @@ fn trans_const<'a, 'tcx>(
|
|||
layout::CEnum { discr: d, min, max, .. } => {
|
||||
let discr = match *kind {
|
||||
mir::AggregateKind::Adt(adt_def, _, _, _) => {
|
||||
Disr::for_variant(ccx.tcx(), adt_def, variant_index)
|
||||
adt_def.discriminant_for_variant(ccx.tcx(), variant_index)
|
||||
.to_u128_unchecked() as u64
|
||||
},
|
||||
_ => Disr(0),
|
||||
_ => 0,
|
||||
};
|
||||
assert_eq!(vals.len(), 0);
|
||||
adt::assert_discr_in_range(Disr(min), Disr(max), discr);
|
||||
C_integral(Type::from_integer(ccx, d), discr.0, true)
|
||||
adt::assert_discr_in_range(min, max, discr);
|
||||
C_integral(Type::from_integer(ccx, d), discr, true)
|
||||
}
|
||||
layout::General { discr: d, ref variants, .. } => {
|
||||
let variant = &variants[variant_index];
|
||||
|
|
|
@ -28,7 +28,6 @@ use type_::Type;
|
|||
use type_of;
|
||||
use tvec;
|
||||
use value::Value;
|
||||
use Disr;
|
||||
|
||||
use super::MirContext;
|
||||
use super::constant::const_scalar_checked_binop;
|
||||
|
@ -107,9 +106,10 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
|
|||
mir::Rvalue::Aggregate(ref kind, ref operands) => {
|
||||
match *kind {
|
||||
mir::AggregateKind::Adt(adt_def, variant_index, substs, active_field_index) => {
|
||||
let disr = Disr::for_variant(bcx.tcx(), adt_def, variant_index);
|
||||
let discr = adt_def.discriminant_for_variant(bcx.tcx(), variant_index)
|
||||
.to_u128_unchecked() as u64;
|
||||
let dest_ty = dest.ty.to_ty(bcx.tcx());
|
||||
adt::trans_set_discr(&bcx, dest_ty, dest.llval, disr);
|
||||
adt::trans_set_discr(&bcx, dest_ty, dest.llval, discr);
|
||||
for (i, operand) in operands.iter().enumerate() {
|
||||
let op = self.trans_operand(&bcx, operand);
|
||||
// Do not generate stores and GEPis for zero-sized fields.
|
||||
|
|
|
@ -18,7 +18,6 @@ use builder::Builder;
|
|||
use super::MirContext;
|
||||
use super::LocalRef;
|
||||
use super::super::adt;
|
||||
use super::super::disr::Disr;
|
||||
|
||||
impl<'a, 'tcx> MirContext<'a, 'tcx> {
|
||||
pub fn trans_statement(&mut self,
|
||||
|
@ -65,7 +64,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
|
|||
adt::trans_set_discr(&bcx,
|
||||
ty,
|
||||
lvalue_transed.llval,
|
||||
Disr::from(variant_index));
|
||||
variant_index as u64);
|
||||
bcx
|
||||
}
|
||||
mir::StatementKind::StorageLive(ref lvalue) => {
|
||||
|
|
|
@ -27,6 +27,7 @@
|
|||
|
||||
#![allow(warnings)]
|
||||
#![feature(rustc_attrs)]
|
||||
#![feature(stmt_expr_attributes)]
|
||||
#![crate_type="rlib"]
|
||||
|
||||
|
||||
|
@ -125,9 +126,12 @@ enum EnumChangeValueCStyleVariant0 {
|
|||
enum EnumChangeValueCStyleVariant0 {
|
||||
Variant1,
|
||||
|
||||
#[rustc_metadata_dirty(cfg="cfail2")]
|
||||
#[rustc_metadata_clean(cfg="cfail2")]
|
||||
#[rustc_metadata_clean(cfg="cfail3")]
|
||||
Variant2 = 22,
|
||||
Variant2 =
|
||||
#[rustc_metadata_dirty(cfg="cfail2")]
|
||||
#[rustc_metadata_clean(cfg="cfail3")]
|
||||
22,
|
||||
}
|
||||
|
||||
#[cfg(cfail1)]
|
||||
|
|
Loading…
Reference in a new issue