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Auto merge of #60913 - spastorino:place2_4, r=<try>
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Place 2.0 change from enum to struct

r? @oli-obk
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@bors
bors committed Jul 20, 2019
2 parents f69b071 + a8ceeeb commit 0c7cf8c
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Showing 51 changed files with 1,735 additions and 989 deletions.
141 changes: 101 additions & 40 deletions src/librustc/mir/mod.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1718,11 +1718,11 @@ impl<'tcx> Debug for Statement<'tcx> {
#[derive(
Clone, PartialEq, Eq, PartialOrd, Ord, Hash, RustcEncodable, RustcDecodable, HashStable,
)]
pub enum Place<'tcx> {
Base(PlaceBase<'tcx>),
pub struct Place<'tcx> {
pub base: PlaceBase<'tcx>,

/// projection out of a place (access a field, deref a pointer, etc)
Projection(Box<Projection<'tcx>>),
pub projection: Option<Box<Projection<'tcx>>>,
}

#[derive(
Expand Down Expand Up @@ -1761,7 +1761,7 @@ impl_stable_hash_for!(struct Static<'tcx> {
Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, RustcEncodable, RustcDecodable, HashStable,
)]
pub struct Projection<'tcx> {
pub base: Place<'tcx>,
pub base: Option<Box<Projection<'tcx>>>,
pub elem: PlaceElem<'tcx>,
}

Expand Down Expand Up @@ -1826,8 +1826,17 @@ newtype_index! {
}
}

#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct PlaceRef<'a, 'tcx> {
pub base: &'a PlaceBase<'tcx>,
pub projection: &'a Option<Box<Projection<'tcx>>>,
}

impl<'tcx> Place<'tcx> {
pub const RETURN_PLACE: Place<'tcx> = Place::Base(PlaceBase::Local(RETURN_PLACE));
pub const RETURN_PLACE: Place<'tcx> = Place {
base: PlaceBase::Local(RETURN_PLACE),
projection: None,
};

pub fn field(self, f: Field, ty: Ty<'tcx>) -> Place<'tcx> {
self.elem(ProjectionElem::Field(f, ty))
Expand All @@ -1853,7 +1862,10 @@ impl<'tcx> Place<'tcx> {
}

pub fn elem(self, elem: PlaceElem<'tcx>) -> Place<'tcx> {
Place::Projection(Box::new(Projection { base: self, elem }))
Place {
base: self.base,
projection: Some(Box::new(Projection { base: self.projection, elem })),
}
}

/// Finds the innermost `Local` from this `Place`, *if* it is either a local itself or
Expand All @@ -1862,54 +1874,77 @@ impl<'tcx> Place<'tcx> {
// FIXME: can we safely swap the semantics of `fn base_local` below in here instead?
pub fn local_or_deref_local(&self) -> Option<Local> {
match self {
Place::Base(PlaceBase::Local(local))
| Place::Projection(box Projection {
base: Place::Base(PlaceBase::Local(local)),
elem: ProjectionElem::Deref,
}) => Some(*local),
Place {
base: PlaceBase::Local(local),
projection: None,
} |
Place {
base: PlaceBase::Local(local),
projection: Some(box Projection {
base: None,
elem: ProjectionElem::Deref,
}),
} => Some(*local),
_ => None,
}
}

/// Finds the innermost `Local` from this `Place`.
pub fn base_local(&self) -> Option<Local> {
let mut place = self;
loop {
match place {
Place::Projection(proj) => place = &proj.base,
Place::Base(PlaceBase::Static(_)) => return None,
Place::Base(PlaceBase::Local(local)) => return Some(*local),
}
}
}

/// Recursively "iterates" over place components, generating a `PlaceBase` and
/// `Projections` list and invoking `op` with a `ProjectionsIter`.
pub fn iterate<R>(
&self,
op: impl FnOnce(&PlaceBase<'tcx>, ProjectionsIter<'_, 'tcx>) -> R,
) -> R {
self.iterate2(&Projections::Empty, op)
Place::iterate_over(&self.base, &self.projection, op)
}

fn iterate2<R>(
&self,
next: &Projections<'_, 'tcx>,
pub fn iterate_over<R>(
place_base: &PlaceBase<'tcx>,
place_projection: &Option<Box<Projection<'tcx>>>,
op: impl FnOnce(&PlaceBase<'tcx>, ProjectionsIter<'_, 'tcx>) -> R,
) -> R {
match self {
Place::Projection(interior) => {
interior.base.iterate2(&Projections::List { projection: interior, next }, op)
fn iterate_over2<'tcx, R>(
place_base: &PlaceBase<'tcx>,
place_projection: &Option<Box<Projection<'tcx>>>,
next: &Projections<'_, 'tcx>,
op: impl FnOnce(&PlaceBase<'tcx>, ProjectionsIter<'_, 'tcx>) -> R,
) -> R {
match place_projection {
None => {
op(place_base, next.iter())
}

Some(interior) => {
iterate_over2(
place_base,
&interior.base,
&Projections::List {
projection: interior,
next,
},
op,
)
}
}
}

Place::Base(base) => op(base, next.iter()),
iterate_over2(place_base, place_projection, &Projections::Empty, op)
}

pub fn as_place_ref(&self) -> PlaceRef<'_, 'tcx> {
PlaceRef {
base: &self.base,
projection: &self.projection,
}
}
}

impl From<Local> for Place<'_> {
fn from(local: Local) -> Self {
Place::Base(local.into())
Place {
base: local.into(),
projection: None,
}
}
}

Expand All @@ -1919,6 +1954,36 @@ impl From<Local> for PlaceBase<'_> {
}
}

impl<'a, 'tcx> PlaceRef<'a, 'tcx> {
pub fn iterate<R>(
&self,
op: impl FnOnce(&PlaceBase<'tcx>, ProjectionsIter<'_, 'tcx>) -> R,
) -> R {
Place::iterate_over(self.base, self.projection, op)
}

/// Finds the innermost `Local` from this `Place`, *if* it is either a local itself or
/// a single deref of a local.
//
// FIXME: can we safely swap the semantics of `fn base_local` below in here instead?
pub fn local_or_deref_local(&self) -> Option<Local> {
match self {
PlaceRef {
base: PlaceBase::Local(local),
projection: None,
} |
PlaceRef {
base: PlaceBase::Local(local),
projection: Some(box Projection {
base: None,
elem: ProjectionElem::Deref,
}),
} => Some(*local),
_ => None,
}
}
}

/// A linked list of projections running up the stack; begins with the
/// innermost projection and extends to the outermost (e.g., `a.b.c`
/// would have the place `b` with a "next" pointer to `b.c`).
Expand Down Expand Up @@ -3155,18 +3220,14 @@ impl<'tcx> TypeFoldable<'tcx> for Terminator<'tcx> {

impl<'tcx> TypeFoldable<'tcx> for Place<'tcx> {
fn super_fold_with<F: TypeFolder<'tcx>>(&self, folder: &mut F) -> Self {
match self {
&Place::Projection(ref p) => Place::Projection(p.fold_with(folder)),
_ => self.clone(),
Place {
base: self.base.clone(),
projection: self.projection.fold_with(folder),
}
}

fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
if let &Place::Projection(ref p) = self {
p.visit_with(visitor)
} else {
false
}
self.projection.visit_with(visitor)
}
}

Expand Down
19 changes: 15 additions & 4 deletions src/librustc/mir/tcx.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -118,11 +118,15 @@ BraceStructTypeFoldableImpl! {
}

impl<'tcx> Place<'tcx> {
pub fn ty<D>(&self, local_decls: &D, tcx: TyCtxt<'tcx>) -> PlaceTy<'tcx>
where
D: HasLocalDecls<'tcx>,
pub fn ty_from<D>(
base: &PlaceBase<'tcx>,
projection: &Option<Box<Projection<'tcx>>>,
local_decls: &D,
tcx: TyCtxt<'tcx>
) -> PlaceTy<'tcx>
where D: HasLocalDecls<'tcx>
{
self.iterate(|place_base, place_projections| {
Place::iterate_over(base, projection, |place_base, place_projections| {
let mut place_ty = place_base.ty(local_decls);

for proj in place_projections {
Expand All @@ -132,6 +136,13 @@ impl<'tcx> Place<'tcx> {
place_ty
})
}

pub fn ty<D>(&self, local_decls: &D, tcx: TyCtxt<'tcx>) -> PlaceTy<'tcx>
where
D: HasLocalDecls<'tcx>,
{
Place::ty_from(&self.base, &self.projection, local_decls, tcx)
}
}

impl<'tcx> PlaceBase<'tcx> {
Expand Down
37 changes: 20 additions & 17 deletions src/librustc/mir/visit.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -159,10 +159,11 @@ macro_rules! make_mir_visitor {
}

fn visit_projection(&mut self,
place_base: & $($mutability)? PlaceBase<'tcx>,
place: & $($mutability)? Projection<'tcx>,
context: PlaceContext,
location: Location) {
self.super_projection(place, context, location);
self.super_projection(place_base, place, context, location);
}

fn visit_constant(&mut self,
Expand Down Expand Up @@ -676,19 +677,20 @@ macro_rules! make_mir_visitor {
place: & $($mutability)? Place<'tcx>,
context: PlaceContext,
location: Location) {
match place {
Place::Base(place_base) => {
self.visit_place_base(place_base, context, location);
}
Place::Projection(proj) => {
let context = if context.is_mutating_use() {
PlaceContext::MutatingUse(MutatingUseContext::Projection)
} else {
PlaceContext::NonMutatingUse(NonMutatingUseContext::Projection)
};
let mut context = context;

if place.projection.is_some() {
context = if context.is_mutating_use() {
PlaceContext::MutatingUse(MutatingUseContext::Projection)
} else {
PlaceContext::NonMutatingUse(NonMutatingUseContext::Projection)
};
}

self.visit_projection(proj, context, location);
}
self.visit_place_base(& $($mutability)? place.base, context, location);

if let Some(box proj) = & $($mutability)? place.projection {
self.visit_projection(& $($mutability)? place.base, proj, context, location);
}
}

Expand All @@ -707,13 +709,14 @@ macro_rules! make_mir_visitor {
}

fn super_projection(&mut self,
place_base: & $($mutability)? PlaceBase<'tcx>,
proj: & $($mutability)? Projection<'tcx>,
context: PlaceContext,
location: Location) {
// this is calling `super_place` in preparation for changing `Place` to be
// a struct with a base and a slice of projections. `visit_place` should only ever
// be called for the outermost place now.
self.super_place(& $($mutability)? proj.base, context, location);
if let Some(box proj_base) = & $($mutability)? proj.base {
self.visit_projection(place_base, proj_base, context, location);
}

match & $($mutability)? proj.elem {
ProjectionElem::Deref => {
}
Expand Down
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