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Only compute captures once when building MIR.

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This commit is contained in:
Camille GILLOT 2022-08-23 22:22:15 +02:00
parent a785176741
commit 389c6041a4
8 changed files with 83 additions and 151 deletions
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134
compiler/rustc_mir_build/src/build/expr/as_place.rs
View File

@ -2,7 +2,7 @@
use crate::build::expr::category::Category;
use crate::build::ForGuard::{OutsideGuard, RefWithinGuard};
use crate::build::{BlockAnd, BlockAndExtension, Builder};
use crate::build::{BlockAnd, BlockAndExtension, Builder, Capture, CaptureMap};
use rustc_hir::def_id::LocalDefId;
use rustc_middle::hir::place::Projection as HirProjection;
use rustc_middle::hir::place::ProjectionKind as HirProjectionKind;
@ -59,8 +59,6 @@ pub(crate) enum PlaceBase {
var_hir_id: LocalVarId,
/// DefId of the closure
closure_def_id: LocalDefId,
/// The trait closure implements, `Fn`, `FnMut`, `FnOnce`
closure_kind: ty::ClosureKind,
},
}
@ -145,27 +143,6 @@ fn is_ancestor_or_same_capture(
iter::zip(proj_possible_ancestor, proj_capture).all(|(a, b)| a == b)
}
/// Computes the index of a capture within the desugared closure provided the closure's
/// `closure_min_captures` and the capture's index of the capture in the
/// `ty::MinCaptureList` of the root variable `var_hir_id`.
fn compute_capture_idx<'tcx>(
closure_min_captures: &ty::RootVariableMinCaptureList<'tcx>,
var_hir_id: LocalVarId,
root_var_idx: usize,
) -> usize {
let mut res = 0;
for (var_id, capture_list) in closure_min_captures {
if *var_id == var_hir_id.0 {
res += root_var_idx;
break;
} else {
res += capture_list.len();
}
}
res
}
/// Given a closure, returns the index of a capture within the desugared closure struct and the
/// `ty::CapturedPlace` which is the ancestor of the Place represented using the `var_hir_id`
/// and `projection`.
@ -174,27 +151,17 @@ fn compute_capture_idx<'tcx>(
///
/// Returns None, when the ancestor is not found.
fn find_capture_matching_projections<'a, 'tcx>(
typeck_results: &'a ty::TypeckResults<'tcx>,
upvars: &'a CaptureMap<'tcx>,
var_hir_id: LocalVarId,
closure_def_id: LocalDefId,
projections: &[PlaceElem<'tcx>],
) -> Option<(usize, &'a ty::CapturedPlace<'tcx>)> {
let closure_min_captures = typeck_results.closure_min_captures.get(&closure_def_id)?;
let root_variable_min_captures = closure_min_captures.get(&var_hir_id.0)?;
) -> Option<(usize, &'a Capture<'tcx>)> {
let hir_projections = convert_to_hir_projections_and_truncate_for_capture(projections);
// If an ancestor is found, `idx` is the index within the list of captured places
// for root variable `var_hir_id` and `capture` is the `ty::CapturedPlace` itself.
let (idx, capture) = root_variable_min_captures.iter().enumerate().find(|(_, capture)| {
upvars.get_by_key_enumerated(var_hir_id.0).find(|(_, capture)| {
let possible_ancestor_proj_kinds: Vec<_> =
capture.place.projections.iter().map(|proj| proj.kind).collect();
capture.captured_place.place.projections.iter().map(|proj| proj.kind).collect();
is_ancestor_or_same_capture(&possible_ancestor_proj_kinds, &hir_projections)
})?;
// Convert index to be from the perspective of the entire closure_min_captures map
// instead of just the root variable capture list
Some((compute_capture_idx(closure_min_captures, var_hir_id, idx), capture))
})
}
/// Takes a PlaceBuilder and resolves the upvar (if any) within it, so that the
@ -204,24 +171,15 @@ fn find_capture_matching_projections<'a, 'tcx>(
fn to_upvars_resolved_place_builder<'a, 'tcx>(
from_builder: PlaceBuilder<'tcx>,
tcx: TyCtxt<'tcx>,
typeck_results: &'a ty::TypeckResults<'tcx>,
upvars: &'a CaptureMap<'tcx>,
) -> Result<PlaceBuilder<'tcx>, PlaceBuilder<'tcx>> {
match from_builder.base {
PlaceBase::Local(_) => Ok(from_builder),
PlaceBase::Upvar { var_hir_id, closure_def_id, closure_kind } => {
let mut upvar_resolved_place_builder = PlaceBuilder::from(ty::CAPTURE_STRUCT_LOCAL);
match closure_kind {
ty::ClosureKind::Fn | ty::ClosureKind::FnMut => {
upvar_resolved_place_builder = upvar_resolved_place_builder.deref();
}
ty::ClosureKind::FnOnce => {}
}
PlaceBase::Upvar { var_hir_id, closure_def_id } => {
let Some((capture_index, capture)) =
find_capture_matching_projections(
typeck_results,
upvars,
var_hir_id,
closure_def_id,
&from_builder.projection,
) else {
let closure_span = tcx.def_span(closure_def_id);
@ -241,39 +199,17 @@ fn to_upvars_resolved_place_builder<'a, 'tcx>(
return Err(from_builder);
};
// We won't be building MIR if the closure wasn't local
let closure_hir_id = tcx.hir().local_def_id_to_hir_id(closure_def_id);
let closure_ty = typeck_results.node_type(closure_hir_id);
let substs = match closure_ty.kind() {
ty::Closure(_, substs) => ty::UpvarSubsts::Closure(substs),
ty::Generator(_, substs, _) => ty::UpvarSubsts::Generator(substs),
_ => bug!("Lowering capture for non-closure type {:?}", closure_ty),
};
// Access the capture by accessing the field within the Closure struct.
//
// We must have inferred the capture types since we are building MIR, therefore
// it's safe to call `tuple_element_ty` and we can unwrap here because
// we know that the capture exists and is the `capture_index`-th capture.
let var_ty = substs.tupled_upvars_ty().tuple_fields()[capture_index];
let capture_info = &upvars[capture_index];
upvar_resolved_place_builder =
upvar_resolved_place_builder.field(Field::new(capture_index), var_ty);
// If the variable is captured via ByRef(Immutable/Mutable) Borrow,
// we need to deref it
upvar_resolved_place_builder = match capture.info.capture_kind {
ty::UpvarCapture::ByRef(_) => upvar_resolved_place_builder.deref(),
ty::UpvarCapture::ByValue => upvar_resolved_place_builder,
};
let mut upvar_resolved_place_builder = PlaceBuilder::from(capture_info.use_place);
// We used some of the projections to build the capture itself,
// now we apply the remaining to the upvar resolved place.
let remaining_projections = strip_prefix(
capture.place.base_ty,
capture.captured_place.place.base_ty,
from_builder.projection,
&capture.place.projections,
&capture.captured_place.place.projections,
);
upvar_resolved_place_builder.projection.extend(remaining_projections);
@ -315,24 +251,24 @@ fn strip_prefix<'tcx>(
}
impl<'tcx> PlaceBuilder<'tcx> {
pub(crate) fn into_place<'a>(
pub(in crate::build) fn into_place<'a>(
self,
tcx: TyCtxt<'tcx>,
typeck_results: &'a ty::TypeckResults<'tcx>,
upvars: &'a CaptureMap<'tcx>,
) -> Place<'tcx> {
if let PlaceBase::Local(local) = self.base {
Place { local, projection: tcx.intern_place_elems(&self.projection) }
} else {
self.expect_upvars_resolved(tcx, typeck_results).into_place(tcx, typeck_results)
self.expect_upvars_resolved(tcx, upvars).into_place(tcx, upvars)
}
}
fn expect_upvars_resolved<'a>(
self,
tcx: TyCtxt<'tcx>,
typeck_results: &'a ty::TypeckResults<'tcx>,
upvars: &'a CaptureMap<'tcx>,
) -> PlaceBuilder<'tcx> {
to_upvars_resolved_place_builder(self, tcx, typeck_results).unwrap()
to_upvars_resolved_place_builder(self, tcx, upvars).unwrap()
}
/// Attempts to resolve the `PlaceBuilder`.
@ -346,12 +282,12 @@ impl<'tcx> PlaceBuilder<'tcx> {
/// not captured. This can happen because the final mir that will be
/// generated doesn't require a read for this place. Failures will only
/// happen inside closures.
pub(crate) fn try_upvars_resolved<'a>(
pub(in crate::build) fn try_upvars_resolved<'a>(
self,
tcx: TyCtxt<'tcx>,
typeck_results: &'a ty::TypeckResults<'tcx>,
upvars: &'a CaptureMap<'tcx>,
) -> Result<PlaceBuilder<'tcx>, PlaceBuilder<'tcx>> {
to_upvars_resolved_place_builder(self, tcx, typeck_results)
to_upvars_resolved_place_builder(self, tcx, upvars)
}
pub(crate) fn base(&self) -> PlaceBase {
@ -392,6 +328,12 @@ impl<'tcx> From<PlaceBase> for PlaceBuilder<'tcx> {
}
}
impl<'tcx> From<Place<'tcx>> for PlaceBuilder<'tcx> {
fn from(p: Place<'tcx>) -> Self {
Self { base: PlaceBase::Local(p.local), projection: p.projection.to_vec() }
}
}
impl<'a, 'tcx> Builder<'a, 'tcx> {
/// Compile `expr`, yielding a place that we can move from etc.
///
@ -411,7 +353,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
expr: &Expr<'tcx>,
) -> BlockAnd<Place<'tcx>> {
let place_builder = unpack!(block = self.as_place_builder(block, expr));
block.and(place_builder.into_place(self.tcx, self.typeck_results))
block.and(place_builder.into_place(self.tcx, &self.upvars))
}
/// This is used when constructing a compound `Place`, so that we can avoid creating
@ -435,7 +377,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
expr: &Expr<'tcx>,
) -> BlockAnd<Place<'tcx>> {
let place_builder = unpack!(block = self.as_read_only_place_builder(block, expr));
block.and(place_builder.into_place(self.tcx, self.typeck_results))
block.and(place_builder.into_place(self.tcx, &self.upvars))
}
/// This is used when constructing a compound `Place`, so that we can avoid creating
@ -530,7 +472,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
inferred_ty: expr.ty,
});
let place = place_builder.clone().into_place(this.tcx, this.typeck_results);
let place = place_builder.clone().into_place(this.tcx, &this.upvars);
this.cfg.push(
block,
Statement {
@ -629,17 +571,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
closure_def_id: LocalDefId,
var_hir_id: LocalVarId,
) -> BlockAnd<PlaceBuilder<'tcx>> {
let closure_ty =
self.typeck_results.node_type(self.tcx.hir().local_def_id_to_hir_id(closure_def_id));
let closure_kind = if let ty::Closure(_, closure_substs) = closure_ty.kind() {
self.infcx.closure_kind(closure_substs).unwrap()
} else {
// Generators are considered FnOnce.
ty::ClosureKind::FnOnce
};
block.and(PlaceBuilder::from(PlaceBase::Upvar { var_hir_id, closure_def_id, closure_kind }))
block.and(PlaceBuilder::from(PlaceBase::Upvar { var_hir_id, closure_def_id }))
}
/// Lower an index expression
@ -678,7 +610,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
if is_outermost_index {
self.read_fake_borrows(block, fake_borrow_temps, source_info)
} else {
base_place = base_place.expect_upvars_resolved(self.tcx, self.typeck_results);
base_place = base_place.expect_upvars_resolved(self.tcx, &self.upvars);
self.add_fake_borrows_of_base(
&base_place,
block,
@ -710,7 +642,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
block,
source_info,
len,
Rvalue::Len(slice.into_place(self.tcx, self.typeck_results)),
Rvalue::Len(slice.into_place(self.tcx, &self.upvars)),
);
// lt = idx < len
self.cfg.push_assign(

17
compiler/rustc_mir_build/src/build/expr/as_rvalue.rs
View File

@ -322,10 +322,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
unpack!(block = this.as_place_builder(block, &this.thir[*thir_place]));
if let Ok(place_builder_resolved) =
place_builder.try_upvars_resolved(this.tcx, this.typeck_results)
place_builder.try_upvars_resolved(this.tcx, &this.upvars)
{
let mir_place =
place_builder_resolved.into_place(this.tcx, this.typeck_results);
let mir_place = place_builder_resolved.into_place(this.tcx, &this.upvars);
this.cfg.push_fake_read(
block,
this.source_info(this.tcx.hir().span(*hir_id)),
@ -617,7 +616,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// is same as that of the capture in the parent closure.
PlaceBase::Upvar { .. } => {
let enclosing_upvars_resolved =
arg_place_builder.clone().into_place(this.tcx, this.typeck_results);
arg_place_builder.clone().into_place(this.tcx, &this.upvars);
match enclosing_upvars_resolved.as_ref() {
PlaceRef {
@ -637,12 +636,12 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
);
// Not in a closure
debug_assert!(
this.upvar_mutbls.len() > upvar_index.index(),
"Unexpected capture place, upvar_mutbls={:#?}, upvar_index={:?}",
this.upvar_mutbls,
this.upvars.len() > upvar_index.index(),
"Unexpected capture place, upvars={:#?}, upvar_index={:?}",
this.upvars,
upvar_index
);
this.upvar_mutbls[upvar_index.index()]
this.upvars[upvar_index.index()].mutability
}
_ => bug!("Unexpected capture place"),
}
@ -654,7 +653,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
Mutability::Mut => BorrowKind::Mut { allow_two_phase_borrow: false },
};
let arg_place = arg_place_builder.into_place(this.tcx, this.typeck_results);
let arg_place = arg_place_builder.into_place(this.tcx, &this.upvars);
this.cfg.push_assign(
block,

4
compiler/rustc_mir_build/src/build/expr/into.rs
View File

@ -366,9 +366,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
None => {
let place_builder = place_builder.clone();
this.consume_by_copy_or_move(
place_builder
.field(n, *ty)
.into_place(this.tcx, this.typeck_results),
place_builder.field(n, *ty).into_place(this.tcx, &this.upvars),
)
}
})

26
compiler/rustc_mir_build/src/build/matches/mod.rs
View File

@ -221,9 +221,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let source_info = self.source_info(scrutinee_span);
if let Ok(scrutinee_builder) =
scrutinee_place_builder.clone().try_upvars_resolved(self.tcx, self.typeck_results)
scrutinee_place_builder.clone().try_upvars_resolved(self.tcx, &self.upvars)
{
let scrutinee_place = scrutinee_builder.into_place(self.tcx, self.typeck_results);
let scrutinee_place = scrutinee_builder.into_place(self.tcx, &self.upvars);
self.cfg.push_fake_read(block, source_info, cause_matched_place, scrutinee_place);
}
@ -348,12 +348,10 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// ```
let mut opt_scrutinee_place: Option<(Option<&Place<'tcx>>, Span)> = None;
let scrutinee_place: Place<'tcx>;
if let Ok(scrutinee_builder) = scrutinee_place_builder
.clone()
.try_upvars_resolved(this.tcx, this.typeck_results)
if let Ok(scrutinee_builder) =
scrutinee_place_builder.clone().try_upvars_resolved(this.tcx, &this.upvars)
{
scrutinee_place =
scrutinee_builder.into_place(this.tcx, this.typeck_results);
scrutinee_place = scrutinee_builder.into_place(this.tcx, &this.upvars);
opt_scrutinee_place = Some((Some(&scrutinee_place), scrutinee_span));
}
let scope = this.declare_bindings(
@ -623,9 +621,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// };
// ```
if let Ok(match_pair_resolved) =
initializer.clone().try_upvars_resolved(self.tcx, self.typeck_results)
initializer.clone().try_upvars_resolved(self.tcx, &self.upvars)
{
let place = match_pair_resolved.into_place(self.tcx, self.typeck_results);
let place = match_pair_resolved.into_place(self.tcx, &self.upvars);
*match_place = Some(place);
}
}
@ -1605,9 +1603,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// Insert a Shallow borrow of any places that is switched on.
if let Some(fb) = fake_borrows && let Ok(match_place_resolved) =
match_place.clone().try_upvars_resolved(self.tcx, self.typeck_results)
match_place.clone().try_upvars_resolved(self.tcx, &self.upvars)
{
let resolved_place = match_place_resolved.into_place(self.tcx, self.typeck_results);
let resolved_place = match_place_resolved.into_place(self.tcx, &self.upvars);
fb.insert(resolved_place);
}
@ -1794,10 +1792,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
);
let mut opt_expr_place: Option<(Option<&Place<'tcx>>, Span)> = None;
let expr_place: Place<'tcx>;
if let Ok(expr_builder) =
expr_place_builder.try_upvars_resolved(self.tcx, self.typeck_results)
{
expr_place = expr_builder.into_place(self.tcx, self.typeck_results);
if let Ok(expr_builder) = expr_place_builder.try_upvars_resolved(self.tcx, &self.upvars) {
expr_place = expr_builder.into_place(self.tcx, &self.upvars);
opt_expr_place = Some((Some(&expr_place), expr_span));
}
let otherwise_post_guard_block = otherwise_candidate.pre_binding_block.unwrap();

8
compiler/rustc_mir_build/src/build/matches/simplify.rs
View File

@ -156,11 +156,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
} => {
// Apply the type ascription to the value at `match_pair.place`, which is the
if let Ok(place_resolved) =
match_pair.place.clone().try_upvars_resolved(self.tcx, self.typeck_results)
match_pair.place.clone().try_upvars_resolved(self.tcx, &self.upvars)
{
candidate.ascriptions.push(Ascription {
annotation: annotation.clone(),
source: place_resolved.into_place(self.tcx, self.typeck_results),
source: place_resolved.into_place(self.tcx, &self.upvars),
variance,
});
}
@ -185,11 +185,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
is_primary: _,
} => {
if let Ok(place_resolved) =
match_pair.place.clone().try_upvars_resolved(self.tcx, self.typeck_results)
match_pair.place.clone().try_upvars_resolved(self.tcx, &self.upvars)
{
candidate.bindings.push(Binding {
span: match_pair.pattern.span,
source: place_resolved.into_place(self.tcx, self.typeck_results),
source: place_resolved.into_place(self.tcx, &self.upvars),
var_id: var,
binding_mode: mode,
});

6
compiler/rustc_mir_build/src/build/matches/test.rs
View File

@ -154,10 +154,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
make_target_blocks: impl FnOnce(&mut Self) -> Vec<BasicBlock>,
) {
let place: Place<'tcx>;
if let Ok(test_place_builder) =
place_builder.try_upvars_resolved(self.tcx, self.typeck_results)
{
place = test_place_builder.into_place(self.tcx, self.typeck_results);
if let Ok(test_place_builder) = place_builder.try_upvars_resolved(self.tcx, &self.upvars) {
place = test_place_builder.into_place(self.tcx, &self.upvars);
} else {
return;
}

8
compiler/rustc_mir_build/src/build/matches/util.rs
View File

@ -32,13 +32,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
) {
let tcx = self.tcx;
let (min_length, exact_size) = if let Ok(place_resolved) =
place.clone().try_upvars_resolved(tcx, self.typeck_results)
place.clone().try_upvars_resolved(tcx, &self.upvars)
{
match place_resolved
.into_place(tcx, self.typeck_results)
.ty(&self.local_decls, tcx)
.ty
.kind()
match place_resolved.into_place(tcx, &self.upvars).ty(&self.local_decls, tcx).ty.kind()
{
ty::Array(_, length) => (length.eval_usize(tcx, self.param_env), true),
_ => ((prefix.len() + suffix.len()).try_into().unwrap(), false),

31
compiler/rustc_mir_build/src/build/mod.rs
View File

@ -6,6 +6,7 @@ use crate::thir::pattern::pat_from_hir;
use rustc_apfloat::ieee::{Double, Single};
use rustc_apfloat::Float;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::sorted_map::SortedIndexMultiMap;
use rustc_errors::ErrorGuaranteed;
use rustc_hir as hir;
use rustc_hir::def_id::{DefId, LocalDefId};
@ -415,12 +416,21 @@ struct Builder<'a, 'tcx> {
var_indices: FxHashMap<LocalVarId, LocalsForNode>,
local_decls: IndexVec<Local, LocalDecl<'tcx>>,
canonical_user_type_annotations: ty::CanonicalUserTypeAnnotations<'tcx>,
upvar_mutbls: Vec<Mutability>,
upvars: CaptureMap<'tcx>,
unit_temp: Option<Place<'tcx>>,
var_debug_info: Vec<VarDebugInfo<'tcx>>,
}
type CaptureMap<'tcx> = SortedIndexMultiMap<usize, hir::HirId, Capture<'tcx>>;
#[derive(Debug)]
struct Capture<'tcx> {
captured_place: &'tcx ty::CapturedPlace<'tcx>,
use_place: Place<'tcx>,
mutability: Mutability,
}
impl<'a, 'tcx> Builder<'a, 'tcx> {
fn is_bound_var_in_guard(&self, id: LocalVarId) -> bool {
self.guard_context.iter().any(|frame| frame.locals.iter().any(|local| local.id == id))
@ -865,7 +875,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
in_scope_unsafe: safety,
local_decls: IndexVec::from_elem_n(LocalDecl::new(return_ty, return_span), 1),
canonical_user_type_annotations: IndexVec::new(),
upvar_mutbls: vec![],
upvars: CaptureMap::new(),
var_indices: Default::default(),
unit_temp: None,
var_debug_info: vec![],
@ -934,7 +944,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// indexed closure and we stored in a map called closure_min_captures in TypeckResults
// with the closure's DefId. Here, we run through that vec of UpvarIds for
// the given closure and use the necessary information to create upvar
// debuginfo and to fill `self.upvar_mutbls`.
// debuginfo and to fill `self.upvars`.
if hir_typeck_results.closure_min_captures.get(&fn_def_id).is_some() {
let mut closure_env_projs = vec![];
let mut closure_ty = self.local_decls[ty::CAPTURE_STRUCT_LOCAL].ty;
@ -954,7 +964,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
.closure_min_captures_flattened(fn_def_id)
.zip(capture_tys.zip(capture_syms));
self.upvar_mutbls = captures_with_tys
self.upvars = captures_with_tys
.enumerate()
.map(|(i, (captured_place, (ty, sym)))| {
let capture = captured_place.info.capture_kind;
@ -974,16 +984,19 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
}
};
let env_place = Place {
local: ty::CAPTURE_STRUCT_LOCAL,
projection: tcx.intern_place_elems(&projs),
};
let use_place = env_place;
self.var_debug_info.push(VarDebugInfo {
name: *sym,
source_info: SourceInfo::outermost(tcx_hir.span(var_id)),
value: VarDebugInfoContents::Place(Place {
local: ty::CAPTURE_STRUCT_LOCAL,
projection: tcx.intern_place_elems(&projs),
}),
value: VarDebugInfoContents::Place(use_place),
});
mutability
let capture = Capture { captured_place, use_place, mutability };
(var_id, capture)
})
.collect();
}