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mir constants: type traversing bye bye

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This commit is contained in:
lcnr 2022-09-27 11:59:25 +02:00
parent 1536ab1b38
commit e8150fa60c
12 changed files with 26 additions and 232 deletions
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26
compiler/rustc_borrowck/src/renumber.rs
View File

@ -1,8 +1,8 @@
use rustc_index::vec::IndexVec;
use rustc_infer::infer::{InferCtxt, NllRegionVariableOrigin};
use rustc_middle::mir::visit::{MutVisitor, TyContext};
use rustc_middle::mir::Constant;
use rustc_middle::mir::{Body, Location, Promoted};
use rustc_middle::mir::{Constant, ConstantKind};
use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable};
@ -38,21 +38,6 @@ where
})
}
// FIXME(valtrees): This function is necessary because `fold_regions`
// panics for mir constants in the visitor.
//
// Once `visit_mir_constant` is removed we can also remove this function
// and just use `renumber_regions`.
fn renumber_regions_in_mir_constant<'tcx>(
infcx: &InferCtxt<'tcx>,
value: ConstantKind<'tcx>,
) -> ConstantKind<'tcx> {
infcx.tcx.super_fold_regions(value, |_region, _depth| {
let origin = NllRegionVariableOrigin::Existential { from_forall: false };
infcx.next_nll_region_var(origin)
})
}
struct NllVisitor<'a, 'tcx> {
infcx: &'a InferCtxt<'tcx>,
}
@ -64,13 +49,6 @@ impl<'a, 'tcx> NllVisitor<'a, 'tcx> {
{
renumber_regions(self.infcx, value)
}
fn renumber_regions_in_mir_constant(
&mut self,
value: ConstantKind<'tcx>,
) -> ConstantKind<'tcx> {
renumber_regions_in_mir_constant(self.infcx, value)
}
}
impl<'a, 'tcx> MutVisitor<'tcx> for NllVisitor<'a, 'tcx> {
@ -103,7 +81,7 @@ impl<'a, 'tcx> MutVisitor<'tcx> for NllVisitor<'a, 'tcx> {
#[instrument(skip(self), level = "debug")]
fn visit_constant(&mut self, constant: &mut Constant<'tcx>, _location: Location) {
let literal = constant.literal;
constant.literal = self.renumber_regions_in_mir_constant(literal);
constant.literal = self.renumber_regions(literal);
debug!("constant: {:#?}", constant);
}
}

5
compiler/rustc_infer/src/infer/resolve.rs
View File

@ -1,6 +1,5 @@
use super::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
use super::{FixupError, FixupResult, InferCtxt, Span};
use rustc_middle::mir;
use rustc_middle::ty::fold::{FallibleTypeFolder, TypeFolder, TypeSuperFoldable};
use rustc_middle::ty::visit::{TypeSuperVisitable, TypeVisitor};
use rustc_middle::ty::{self, Const, InferConst, Ty, TyCtxt, TypeFoldable, TypeVisitable};
@ -48,10 +47,6 @@ impl<'a, 'tcx> TypeFolder<'tcx> for OpportunisticVarResolver<'a, 'tcx> {
ct.super_fold_with(self)
}
}
fn fold_mir_const(&mut self, constant: mir::ConstantKind<'tcx>) -> mir::ConstantKind<'tcx> {
constant.super_fold_with(self)
}
}
/// The opportunistic region resolver opportunistically resolves regions

8
compiler/rustc_middle/src/mir/mod.rs
View File

@ -7,9 +7,9 @@ use crate::mir::interpret::{
};
use crate::mir::visit::MirVisitable;
use crate::ty::codec::{TyDecoder, TyEncoder};
use crate::ty::fold::{FallibleTypeFolder, TypeFoldable, TypeSuperFoldable};
use crate::ty::fold::{FallibleTypeFolder, TypeFoldable};
use crate::ty::print::{FmtPrinter, Printer};
use crate::ty::visit::{TypeSuperVisitable, TypeVisitable, TypeVisitor};
use crate::ty::visit::{TypeVisitable, TypeVisitor};
use crate::ty::{self, List, Ty, TyCtxt};
use crate::ty::{AdtDef, InstanceDef, ScalarInt, UserTypeAnnotationIndex};
use crate::ty::{GenericArg, InternalSubsts, SubstsRef};
@ -2056,7 +2056,7 @@ pub struct Constant<'tcx> {
}
#[derive(Clone, Copy, PartialEq, Eq, TyEncodable, TyDecodable, Hash, HashStable, Debug)]
#[derive(Lift)]
#[derive(Lift, TypeFoldable, TypeVisitable)]
pub enum ConstantKind<'tcx> {
/// This constant came from the type system
Ty(ty::Const<'tcx>),
@ -2448,7 +2448,7 @@ impl<'tcx> ConstantKind<'tcx> {
/// An unevaluated (potentially generic) constant used in MIR.
#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord, TyEncodable, TyDecodable, Lift)]
#[derive(Hash, HashStable)]
#[derive(Hash, HashStable, TypeFoldable, TypeVisitable)]
pub struct UnevaluatedConst<'tcx> {
pub def: ty::WithOptConstParam<DefId>,
pub substs: SubstsRef<'tcx>,

42
compiler/rustc_middle/src/mir/type_foldable.rs
View File

@ -3,7 +3,6 @@
use rustc_ast::InlineAsmTemplatePiece;
use super::*;
use crate::mir;
use crate::ty;
TrivialTypeTraversalAndLiftImpls! {
@ -51,43 +50,8 @@ impl<'tcx, R: Idx, C: Idx> TypeFoldable<'tcx> for BitMatrix<R, C> {
}
}
impl<'tcx> TypeFoldable<'tcx> for mir::UnevaluatedConst<'tcx> {
fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
folder.try_fold_mir_unevaluated(self)
}
}
impl<'tcx> TypeSuperFoldable<'tcx> for mir::UnevaluatedConst<'tcx> {
fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
self,
folder: &mut F,
) -> Result<Self, F::Error> {
Ok(mir::UnevaluatedConst {
def: self.def,
substs: self.substs.try_fold_with(folder)?,
promoted: self.promoted,
})
}
}
impl<'tcx> TypeFoldable<'tcx> for ConstantKind<'tcx> {
#[inline(always)]
fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
folder.try_fold_mir_const(self)
}
}
impl<'tcx> TypeSuperFoldable<'tcx> for ConstantKind<'tcx> {
fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
self,
folder: &mut F,
) -> Result<Self, F::Error> {
match self {
ConstantKind::Ty(c) => Ok(ConstantKind::Ty(c.try_fold_with(folder)?)),
ConstantKind::Val(v, t) => Ok(ConstantKind::Val(v, t.try_fold_with(folder)?)),
ConstantKind::Unevaluated(uv, t) => {
Ok(ConstantKind::Unevaluated(uv.try_fold_with(folder)?, t.try_fold_with(folder)?))
}
}
impl<'tcx> TypeFoldable<'tcx> for ConstValue<'tcx> {
fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
Ok(self)
}
}

32
compiler/rustc_middle/src/mir/type_visitable.rs
View File

@ -1,7 +1,6 @@
//! `TypeVisitable` implementations for MIR types
use super::*;
use crate::mir;
impl<'tcx, R: Idx, C: Idx> TypeVisitable<'tcx> for BitMatrix<R, C> {
fn visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
@ -9,33 +8,8 @@ impl<'tcx, R: Idx, C: Idx> TypeVisitable<'tcx> for BitMatrix<R, C> {
}
}
impl<'tcx> TypeVisitable<'tcx> for mir::UnevaluatedConst<'tcx> {
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
visitor.visit_mir_unevaluated(*self)
}
}
impl<'tcx> TypeSuperVisitable<'tcx> for mir::UnevaluatedConst<'tcx> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.substs.visit_with(visitor)
}
}
impl<'tcx> TypeVisitable<'tcx> for ConstantKind<'tcx> {
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
visitor.visit_mir_const(*self)
}
}
impl<'tcx> TypeSuperVisitable<'tcx> for ConstantKind<'tcx> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
match *self {
ConstantKind::Ty(c) => c.visit_with(visitor),
ConstantKind::Val(_, t) => t.visit_with(visitor),
ConstantKind::Unevaluated(uv, t) => {
uv.visit_with(visitor)?;
t.visit_with(visitor)
}
}
impl<'tcx> TypeVisitable<'tcx> for ConstValue<'tcx> {
fn visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
ControlFlow::CONTINUE
}
}

5
compiler/rustc_middle/src/ty/erase_regions.rs
View File

@ -1,4 +1,3 @@
use crate::mir;
use crate::ty::fold::{TypeFoldable, TypeFolder, TypeSuperFoldable};
use crate::ty::visit::TypeVisitable;
use crate::ty::{self, Ty, TyCtxt, TypeFlags};
@ -67,8 +66,4 @@ impl<'tcx> TypeFolder<'tcx> for RegionEraserVisitor<'tcx> {
_ => self.tcx.lifetimes.re_erased,
}
}
fn fold_mir_const(&mut self, c: mir::ConstantKind<'tcx>) -> mir::ConstantKind<'tcx> {
c.super_fold_with(self)
}
}

40
compiler/rustc_middle/src/ty/fold.rs
View File

@ -42,7 +42,6 @@
//! - ty.super_fold_with(folder)
//! - u.fold_with(folder)
//! ```
use crate::mir;
use crate::ty::{self, Binder, BoundTy, Ty, TyCtxt, TypeVisitable};
use rustc_data_structures::fx::FxIndexMap;
use rustc_hir::def_id::DefId;
@ -134,20 +133,9 @@ pub trait TypeFolder<'tcx>: FallibleTypeFolder<'tcx, Error = !> {
uv.super_fold_with(self)
}
fn fold_mir_unevaluated(
&mut self,
uv: mir::UnevaluatedConst<'tcx>,
) -> mir::UnevaluatedConst<'tcx> {
uv.super_fold_with(self)
}
fn fold_predicate(&mut self, p: ty::Predicate<'tcx>) -> ty::Predicate<'tcx> {
p.super_fold_with(self)
}
fn fold_mir_const(&mut self, c: mir::ConstantKind<'tcx>) -> mir::ConstantKind<'tcx> {
bug!("most type folders should not be folding MIR datastructures: {:?}", c)
}
}
/// This trait is implemented for every folding traversal. There is a fold
@ -188,26 +176,12 @@ pub trait FallibleTypeFolder<'tcx>: Sized {
c.try_super_fold_with(self)
}
fn try_fold_mir_unevaluated(
&mut self,
c: mir::UnevaluatedConst<'tcx>,
) -> Result<mir::UnevaluatedConst<'tcx>, Self::Error> {
c.try_super_fold_with(self)
}
fn try_fold_predicate(
&mut self,
p: ty::Predicate<'tcx>,
) -> Result<ty::Predicate<'tcx>, Self::Error> {
p.try_super_fold_with(self)
}
fn try_fold_mir_const(
&mut self,
c: mir::ConstantKind<'tcx>,
) -> Result<mir::ConstantKind<'tcx>, Self::Error> {
bug!("most type folders should not be folding MIR datastructures: {:?}", c)
}
}
// This blanket implementation of the fallible trait for infallible folders
@ -248,23 +222,9 @@ where
Ok(self.fold_ty_unevaluated(c))
}
fn try_fold_mir_unevaluated(
&mut self,
c: mir::UnevaluatedConst<'tcx>,
) -> Result<mir::UnevaluatedConst<'tcx>, !> {
Ok(self.fold_mir_unevaluated(c))
}
fn try_fold_predicate(&mut self, p: ty::Predicate<'tcx>) -> Result<ty::Predicate<'tcx>, !> {
Ok(self.fold_predicate(p))
}
fn try_fold_mir_const(
&mut self,
c: mir::ConstantKind<'tcx>,
) -> Result<mir::ConstantKind<'tcx>, !> {
Ok(self.fold_mir_const(c))
}
}
///////////////////////////////////////////////////////////////////////////

21
compiler/rustc_middle/src/ty/normalize_erasing_regions.rs
View File

@ -214,15 +214,6 @@ impl<'tcx> TypeFolder<'tcx> for NormalizeAfterErasingRegionsFolder<'tcx> {
fn fold_const(&mut self, c: ty::Const<'tcx>) -> ty::Const<'tcx> {
self.normalize_generic_arg_after_erasing_regions(c.into()).expect_const()
}
#[inline]
fn fold_mir_const(&mut self, c: mir::ConstantKind<'tcx>) -> mir::ConstantKind<'tcx> {
// FIXME: This *probably* needs canonicalization too!
let arg = self.param_env.and(c);
self.tcx
.try_normalize_mir_const_after_erasing_regions(arg)
.unwrap_or_else(|_| bug!("failed to normalize {:?}", c))
}
}
struct TryNormalizeAfterErasingRegionsFolder<'tcx> {
@ -267,16 +258,4 @@ impl<'tcx> FallibleTypeFolder<'tcx> for TryNormalizeAfterErasingRegionsFolder<'t
Err(_) => Err(NormalizationError::Const(c)),
}
}
fn try_fold_mir_const(
&mut self,
c: mir::ConstantKind<'tcx>,
) -> Result<mir::ConstantKind<'tcx>, Self::Error> {
// FIXME: This *probably* needs canonicalization too!
let arg = self.param_env.and(c);
match self.tcx.try_normalize_mir_const_after_erasing_regions(arg) {
Ok(c) => Ok(c),
Err(_) => Err(NormalizationError::ConstantKind(c)),
}
}
}

6
compiler/rustc_middle/src/ty/subst.rs
View File

@ -1,6 +1,5 @@
// Type substitutions.
use crate::mir;
use crate::ty::codec::{TyDecoder, TyEncoder};
use crate::ty::fold::{FallibleTypeFolder, TypeFoldable, TypeFolder, TypeSuperFoldable};
use crate::ty::sty::{ClosureSubsts, GeneratorSubsts, InlineConstSubsts};
@ -662,11 +661,6 @@ impl<'a, 'tcx> TypeFolder<'tcx> for SubstFolder<'a, 'tcx> {
c.super_fold_with(self)
}
}
#[inline]
fn fold_mir_const(&mut self, c: mir::ConstantKind<'tcx>) -> mir::ConstantKind<'tcx> {
c.super_fold_with(self)
}
}
impl<'a, 'tcx> SubstFolder<'a, 'tcx> {

25
compiler/rustc_middle/src/ty/visit.rs
View File

@ -38,7 +38,6 @@
//! - ty.super_visit_with(visitor)
//! - u.visit_with(visitor)
//! ```
use crate::mir;
use crate::ty::{self, flags::FlagComputation, Binder, Ty, TyCtxt, TypeFlags};
use rustc_errors::ErrorGuaranteed;
@ -205,20 +204,9 @@ pub trait TypeVisitor<'tcx>: Sized {
uv.super_visit_with(self)
}
fn visit_mir_unevaluated(
&mut self,
uv: mir::UnevaluatedConst<'tcx>,
) -> ControlFlow<Self::BreakTy> {
uv.super_visit_with(self)
}
fn visit_predicate(&mut self, p: ty::Predicate<'tcx>) -> ControlFlow<Self::BreakTy> {
p.super_visit_with(self)
}
fn visit_mir_const(&mut self, c: mir::ConstantKind<'tcx>) -> ControlFlow<Self::BreakTy> {
c.super_visit_with(self)
}
}
///////////////////////////////////////////////////////////////////////////
@ -619,19 +607,6 @@ impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
}
}
fn visit_mir_unevaluated(
&mut self,
uv: mir::UnevaluatedConst<'tcx>,
) -> ControlFlow<Self::BreakTy> {
let flags = FlagComputation::for_unevaluated_const(uv.shrink());
trace!(r.flags=?flags);
if flags.intersects(self.flags) {
ControlFlow::Break(FoundFlags)
} else {
ControlFlow::CONTINUE
}
}
#[inline]
#[instrument(level = "trace", ret)]
fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<Self::BreakTy> {

40
compiler/rustc_monomorphize/src/polymorphize.rs
View File

@ -276,9 +276,21 @@ impl<'a, 'tcx> Visitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
ConstantKind::Ty(c) => {
c.visit_with(self);
}
ConstantKind::Val(_, ty) | ConstantKind::Unevaluated(_, ty) => {
Visitor::visit_ty(self, ty, TyContext::Location(location))
ConstantKind::Unevaluated(mir::UnevaluatedConst { def, substs: _, promoted }, ty) => {
// Avoid considering `T` unused when constants are of the form:
// `<Self as Foo<T>>::foo::promoted[p]`
if let Some(p) = promoted {
if self.def_id == def.did && !self.tcx.generics_of(def.did).has_self {
// If there is a promoted, don't look at the substs - since it will always contain
// the generic parameters, instead, traverse the promoted MIR.
let promoted = self.tcx.promoted_mir(def.did);
self.visit_body(&promoted[p]);
}
}
Visitor::visit_ty(self, ty, TyContext::Location(location));
}
ConstantKind::Val(_, ty) => Visitor::visit_ty(self, ty, TyContext::Location(location)),
}
}
@ -310,30 +322,6 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
}
}
fn visit_mir_const(&mut self, constant: ConstantKind<'tcx>) -> ControlFlow<Self::BreakTy> {
if !constant.has_non_region_param() {
return ControlFlow::CONTINUE;
}
match constant {
ConstantKind::Ty(ct) => ct.visit_with(self),
ConstantKind::Unevaluated(mir::UnevaluatedConst { def, substs: _, promoted: Some(p) }, _)
// Avoid considering `T` unused when constants are of the form:
// `<Self as Foo<T>>::foo::promoted[p]`
if self.def_id == def.did && !self.tcx.generics_of(def.did).has_self =>
{
// If there is a promoted, don't look at the substs - since it will always contain
// the generic parameters, instead, traverse the promoted MIR.
let promoted = self.tcx.promoted_mir(def.did);
self.visit_body(&promoted[p]);
ControlFlow::CONTINUE
}
ConstantKind::Val(..) | ConstantKind::Unevaluated(..) => {
constant.super_visit_with(self)
}
}
}
#[instrument(level = "debug", skip(self))]
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
if !ty.has_non_region_param() {

8
compiler/rustc_trait_selection/src/traits/query/normalize.rs
View File

@ -11,7 +11,6 @@ use crate::traits::{Obligation, ObligationCause, PredicateObligation, Reveal};
use rustc_data_structures::sso::SsoHashMap;
use rustc_data_structures::stack::ensure_sufficient_stack;
use rustc_infer::traits::Normalized;
use rustc_middle::mir;
use rustc_middle::ty::fold::{FallibleTypeFolder, TypeFoldable, TypeSuperFoldable};
use rustc_middle::ty::visit::{TypeSuperVisitable, TypeVisitable};
use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitor};
@ -347,13 +346,6 @@ impl<'cx, 'tcx> FallibleTypeFolder<'tcx> for QueryNormalizer<'cx, 'tcx> {
))
}
fn try_fold_mir_const(
&mut self,
constant: mir::ConstantKind<'tcx>,
) -> Result<mir::ConstantKind<'tcx>, Self::Error> {
constant.try_super_fold_with(self)
}
#[inline]
fn try_fold_predicate(
&mut self,