From 0cf5a8ad15af795beff92f923eac9ba4b71e2790 Mon Sep 17 00:00:00 2001 From: LeSeulArtichaut Date: Wed, 18 Nov 2020 16:37:10 +0100 Subject: [PATCH] Create `rustc_ty_library` --- Cargo.lock | 11 ++ compiler/rustc_middle/Cargo.toml | 1 + compiler/rustc_middle/src/ty/mod.rs | 88 +----------- compiler/rustc_middle/src/ty/sty.rs | 110 +-------------- compiler/rustc_type_ir/Cargo.toml | 14 ++ compiler/rustc_type_ir/src/lib.rs | 204 ++++++++++++++++++++++++++++ 6 files changed, 234 insertions(+), 194 deletions(-) create mode 100644 compiler/rustc_type_ir/Cargo.toml create mode 100644 compiler/rustc_type_ir/src/lib.rs diff --git a/Cargo.lock b/Cargo.lock index ce1f705bdff..3f9d628b491 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -3918,6 +3918,7 @@ dependencies = [ "rustc_session", "rustc_span", "rustc_target", + "rustc_type_ir", "smallvec 1.4.2", "tracing", ] @@ -4251,6 +4252,16 @@ dependencies = [ "tracing", ] +[[package]] +name = "rustc_type_ir" +version = "0.0.0" +dependencies = [ + "bitflags", + "rustc_data_structures", + "rustc_index", + "rustc_serialize", +] + [[package]] name = "rustc_typeck" version = "0.0.0" diff --git a/compiler/rustc_middle/Cargo.toml b/compiler/rustc_middle/Cargo.toml index 3250f1830de..47b7768b410 100644 --- a/compiler/rustc_middle/Cargo.toml +++ b/compiler/rustc_middle/Cargo.toml @@ -30,3 +30,4 @@ chalk-ir = "0.36.0" smallvec = { version = "1.0", features = ["union", "may_dangle"] } measureme = "9.0.0" rustc_session = { path = "../rustc_session" } +rustc_type_ir = { path = "../rustc_type_ir" } diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs index 5d8edcf70bf..038de42a6f1 100644 --- a/compiler/rustc_middle/src/ty/mod.rs +++ b/compiler/rustc_middle/src/ty/mod.rs @@ -56,7 +56,7 @@ pub use self::sty::RegionKind; pub use self::sty::RegionKind::*; pub use self::sty::TyKind::*; -pub use self::sty::{Binder, BoundTy, BoundTyKind, BoundVar, DebruijnIndex, INNERMOST}; +pub use self::sty::{Binder, BoundTy, BoundTyKind, BoundVar}; pub use self::sty::{BoundRegion, EarlyBoundRegion, FreeRegion, Region}; pub use self::sty::{CanonicalPolyFnSig, FnSig, GenSig, PolyFnSig, PolyGenSig}; pub use self::sty::{ClosureSubsts, GeneratorSubsts, TypeAndMut, UpvarSubsts}; @@ -67,6 +67,7 @@ pub use self::sty::{ExistentialTraitRef, PolyExistentialTraitRef}; pub use self::sty::{PolyTraitRef, TraitRef, TyKind}; pub use crate::ty::diagnostics::*; +pub use rustc_type_ir::{DebruijnIndex, TypeFlags, INNERMOST}; pub use self::binding::BindingMode; pub use self::binding::BindingMode::*; @@ -497,91 +498,6 @@ pub struct CReaderCacheKey { pub pos: usize, } -bitflags! { - /// Flags that we track on types. These flags are propagated upwards - /// through the type during type construction, so that we can quickly check - /// whether the type has various kinds of types in it without recursing - /// over the type itself. - pub struct TypeFlags: u32 { - // Does this have parameters? Used to determine whether substitution is - // required. - /// Does this have [Param]? - const HAS_TY_PARAM = 1 << 0; - /// Does this have [ReEarlyBound]? - const HAS_RE_PARAM = 1 << 1; - /// Does this have [ConstKind::Param]? - const HAS_CT_PARAM = 1 << 2; - - const NEEDS_SUBST = TypeFlags::HAS_TY_PARAM.bits - | TypeFlags::HAS_RE_PARAM.bits - | TypeFlags::HAS_CT_PARAM.bits; - - /// Does this have [Infer]? - const HAS_TY_INFER = 1 << 3; - /// Does this have [ReVar]? - const HAS_RE_INFER = 1 << 4; - /// Does this have [ConstKind::Infer]? - const HAS_CT_INFER = 1 << 5; - - /// Does this have inference variables? Used to determine whether - /// inference is required. - const NEEDS_INFER = TypeFlags::HAS_TY_INFER.bits - | TypeFlags::HAS_RE_INFER.bits - | TypeFlags::HAS_CT_INFER.bits; - - /// Does this have [Placeholder]? - const HAS_TY_PLACEHOLDER = 1 << 6; - /// Does this have [RePlaceholder]? - const HAS_RE_PLACEHOLDER = 1 << 7; - /// Does this have [ConstKind::Placeholder]? - const HAS_CT_PLACEHOLDER = 1 << 8; - - /// `true` if there are "names" of regions and so forth - /// that are local to a particular fn/inferctxt - const HAS_FREE_LOCAL_REGIONS = 1 << 9; - - /// `true` if there are "names" of types and regions and so forth - /// that are local to a particular fn - const HAS_FREE_LOCAL_NAMES = TypeFlags::HAS_TY_PARAM.bits - | TypeFlags::HAS_CT_PARAM.bits - | TypeFlags::HAS_TY_INFER.bits - | TypeFlags::HAS_CT_INFER.bits - | TypeFlags::HAS_TY_PLACEHOLDER.bits - | TypeFlags::HAS_CT_PLACEHOLDER.bits - | TypeFlags::HAS_FREE_LOCAL_REGIONS.bits; - - /// Does this have [Projection]? - const HAS_TY_PROJECTION = 1 << 10; - /// Does this have [Opaque]? - const HAS_TY_OPAQUE = 1 << 11; - /// Does this have [ConstKind::Unevaluated]? - const HAS_CT_PROJECTION = 1 << 12; - - /// Could this type be normalized further? - const HAS_PROJECTION = TypeFlags::HAS_TY_PROJECTION.bits - | TypeFlags::HAS_TY_OPAQUE.bits - | TypeFlags::HAS_CT_PROJECTION.bits; - - /// Is an error type/const reachable? - const HAS_ERROR = 1 << 13; - - /// Does this have any region that "appears free" in the type? - /// Basically anything but [ReLateBound] and [ReErased]. - const HAS_FREE_REGIONS = 1 << 14; - - /// Does this have any [ReLateBound] regions? Used to check - /// if a global bound is safe to evaluate. - const HAS_RE_LATE_BOUND = 1 << 15; - - /// Does this have any [ReErased] regions? - const HAS_RE_ERASED = 1 << 16; - - /// Does this value have parameters/placeholders/inference variables which could be - /// replaced later, in a way that would change the results of `impl` specialization? - const STILL_FURTHER_SPECIALIZABLE = 1 << 17; - } -} - #[allow(rustc::usage_of_ty_tykind)] pub struct TyS<'tcx> { /// This field shouldn't be used directly and may be removed in the future. diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs index 78994c6e1c7..72c97dfcf5d 100644 --- a/compiler/rustc_middle/src/ty/sty.rs +++ b/compiler/rustc_middle/src/ty/sty.rs @@ -1289,53 +1289,6 @@ pub fn to_const(self, tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> &'tcx ty::Const<'tcx> } } -rustc_index::newtype_index! { - /// A [De Bruijn index][dbi] is a standard means of representing - /// regions (and perhaps later types) in a higher-ranked setting. In - /// particular, imagine a type like this: - /// - /// for<'a> fn(for<'b> fn(&'b isize, &'a isize), &'a char) - /// ^ ^ | | | - /// | | | | | - /// | +------------+ 0 | | - /// | | | - /// +----------------------------------+ 1 | - /// | | - /// +----------------------------------------------+ 0 - /// - /// In this type, there are two binders (the outer fn and the inner - /// fn). We need to be able to determine, for any given region, which - /// fn type it is bound by, the inner or the outer one. There are - /// various ways you can do this, but a De Bruijn index is one of the - /// more convenient and has some nice properties. The basic idea is to - /// count the number of binders, inside out. Some examples should help - /// clarify what I mean. - /// - /// Let's start with the reference type `&'b isize` that is the first - /// argument to the inner function. This region `'b` is assigned a De - /// Bruijn index of 0, meaning "the innermost binder" (in this case, a - /// fn). The region `'a` that appears in the second argument type (`&'a - /// isize`) would then be assigned a De Bruijn index of 1, meaning "the - /// second-innermost binder". (These indices are written on the arrays - /// in the diagram). - /// - /// What is interesting is that De Bruijn index attached to a particular - /// variable will vary depending on where it appears. For example, - /// the final type `&'a char` also refers to the region `'a` declared on - /// the outermost fn. But this time, this reference is not nested within - /// any other binders (i.e., it is not an argument to the inner fn, but - /// rather the outer one). Therefore, in this case, it is assigned a - /// De Bruijn index of 0, because the innermost binder in that location - /// is the outer fn. - /// - /// [dbi]: https://en.wikipedia.org/wiki/De_Bruijn_index - #[derive(HashStable)] - pub struct DebruijnIndex { - DEBUG_FORMAT = "DebruijnIndex({})", - const INNERMOST = 0, - } -} - pub type Region<'tcx> = &'tcx RegionKind; /// Representation of regions. Note that the NLL checker uses a distinct @@ -1450,7 +1403,7 @@ pub enum RegionKind { /// Region bound in a function scope, which will be substituted when the /// function is called. - ReLateBound(DebruijnIndex, BoundRegion), + ReLateBound(ty::DebruijnIndex, BoundRegion), /// When checking a function body, the types of all arguments and so forth /// that refer to bound region parameters are modified to refer to free @@ -1614,65 +1567,6 @@ pub fn item_def_id(&self) -> DefId { } } -impl DebruijnIndex { - /// Returns the resulting index when this value is moved into - /// `amount` number of new binders. So, e.g., if you had - /// - /// for<'a> fn(&'a x) - /// - /// and you wanted to change it to - /// - /// for<'a> fn(for<'b> fn(&'a x)) - /// - /// you would need to shift the index for `'a` into a new binder. - #[must_use] - pub fn shifted_in(self, amount: u32) -> DebruijnIndex { - DebruijnIndex::from_u32(self.as_u32() + amount) - } - - /// Update this index in place by shifting it "in" through - /// `amount` number of binders. - pub fn shift_in(&mut self, amount: u32) { - *self = self.shifted_in(amount); - } - - /// Returns the resulting index when this value is moved out from - /// `amount` number of new binders. - #[must_use] - pub fn shifted_out(self, amount: u32) -> DebruijnIndex { - DebruijnIndex::from_u32(self.as_u32() - amount) - } - - /// Update in place by shifting out from `amount` binders. - pub fn shift_out(&mut self, amount: u32) { - *self = self.shifted_out(amount); - } - - /// Adjusts any De Bruijn indices so as to make `to_binder` the - /// innermost binder. That is, if we have something bound at `to_binder`, - /// it will now be bound at INNERMOST. This is an appropriate thing to do - /// when moving a region out from inside binders: - /// - /// ``` - /// for<'a> fn(for<'b> for<'c> fn(&'a u32), _) - /// // Binder: D3 D2 D1 ^^ - /// ``` - /// - /// Here, the region `'a` would have the De Bruijn index D3, - /// because it is the bound 3 binders out. However, if we wanted - /// to refer to that region `'a` in the second argument (the `_`), - /// those two binders would not be in scope. In that case, we - /// might invoke `shift_out_to_binder(D3)`. This would adjust the - /// De Bruijn index of `'a` to D1 (the innermost binder). - /// - /// If we invoke `shift_out_to_binder` and the region is in fact - /// bound by one of the binders we are shifting out of, that is an - /// error (and should fail an assertion failure). - pub fn shifted_out_to_binder(self, to_binder: DebruijnIndex) -> Self { - self.shifted_out(to_binder.as_u32() - INNERMOST.as_u32()) - } -} - /// Region utilities impl RegionKind { /// Is this region named by the user? @@ -1703,7 +1597,7 @@ pub fn is_placeholder(&self) -> bool { } } - pub fn bound_at_or_above_binder(&self, index: DebruijnIndex) -> bool { + pub fn bound_at_or_above_binder(&self, index: ty::DebruijnIndex) -> bool { match *self { ty::ReLateBound(debruijn, _) => debruijn >= index, _ => false, diff --git a/compiler/rustc_type_ir/Cargo.toml b/compiler/rustc_type_ir/Cargo.toml new file mode 100644 index 00000000000..d50451b7794 --- /dev/null +++ b/compiler/rustc_type_ir/Cargo.toml @@ -0,0 +1,14 @@ +[package] +name = "rustc_type_ir" +version = "0.0.0" +authors = ["The Rust Project Developers"] +edition = "2018" + +[lib] +doctest = false + +[dependencies] +bitflags = "1.2.1" +rustc_index = { path = "../rustc_index" } +rustc_serialize = { path = "../rustc_serialize" } +rustc_data_structures = { path = "../rustc_data_structures" } diff --git a/compiler/rustc_type_ir/src/lib.rs b/compiler/rustc_type_ir/src/lib.rs new file mode 100644 index 00000000000..1c9475f7a66 --- /dev/null +++ b/compiler/rustc_type_ir/src/lib.rs @@ -0,0 +1,204 @@ +#![feature(never_type)] +#![feature(const_panic)] +#![feature(control_flow_enum)] + +#[macro_use] +extern crate bitflags; + +use rustc_data_structures::stable_hasher::{HashStable, StableHasher}; + +bitflags! { + /// Flags that we track on types. These flags are propagated upwards + /// through the type during type construction, so that we can quickly check + /// whether the type has various kinds of types in it without recursing + /// over the type itself. + pub struct TypeFlags: u32 { + // Does this have parameters? Used to determine whether substitution is + // required. + /// Does this have `Param`? + const HAS_TY_PARAM = 1 << 0; + /// Does this have `ReEarlyBound`? + const HAS_RE_PARAM = 1 << 1; + /// Does this have `ConstKind::Param`? + const HAS_CT_PARAM = 1 << 2; + + const NEEDS_SUBST = TypeFlags::HAS_TY_PARAM.bits + | TypeFlags::HAS_RE_PARAM.bits + | TypeFlags::HAS_CT_PARAM.bits; + + /// Does this have `Infer`? + const HAS_TY_INFER = 1 << 3; + /// Does this have `ReVar`? + const HAS_RE_INFER = 1 << 4; + /// Does this have `ConstKind::Infer`? + const HAS_CT_INFER = 1 << 5; + + /// Does this have inference variables? Used to determine whether + /// inference is required. + const NEEDS_INFER = TypeFlags::HAS_TY_INFER.bits + | TypeFlags::HAS_RE_INFER.bits + | TypeFlags::HAS_CT_INFER.bits; + + /// Does this have `Placeholder`? + const HAS_TY_PLACEHOLDER = 1 << 6; + /// Does this have `RePlaceholder`? + const HAS_RE_PLACEHOLDER = 1 << 7; + /// Does this have `ConstKind::Placeholder`? + const HAS_CT_PLACEHOLDER = 1 << 8; + + /// `true` if there are "names" of regions and so forth + /// that are local to a particular fn/inferctxt + const HAS_FREE_LOCAL_REGIONS = 1 << 9; + + /// `true` if there are "names" of types and regions and so forth + /// that are local to a particular fn + const HAS_FREE_LOCAL_NAMES = TypeFlags::HAS_TY_PARAM.bits + | TypeFlags::HAS_CT_PARAM.bits + | TypeFlags::HAS_TY_INFER.bits + | TypeFlags::HAS_CT_INFER.bits + | TypeFlags::HAS_TY_PLACEHOLDER.bits + | TypeFlags::HAS_CT_PLACEHOLDER.bits + | TypeFlags::HAS_FREE_LOCAL_REGIONS.bits; + + /// Does this have `Projection`? + const HAS_TY_PROJECTION = 1 << 10; + /// Does this have `Opaque`? + const HAS_TY_OPAQUE = 1 << 11; + /// Does this have `ConstKind::Unevaluated`? + const HAS_CT_PROJECTION = 1 << 12; + + /// Could this type be normalized further? + const HAS_PROJECTION = TypeFlags::HAS_TY_PROJECTION.bits + | TypeFlags::HAS_TY_OPAQUE.bits + | TypeFlags::HAS_CT_PROJECTION.bits; + + /// Is an error type/const reachable? + const HAS_ERROR = 1 << 13; + + /// Does this have any region that "appears free" in the type? + /// Basically anything but `ReLateBound` and `ReErased`. + const HAS_FREE_REGIONS = 1 << 14; + + /// Does this have any `ReLateBound` regions? Used to check + /// if a global bound is safe to evaluate. + const HAS_RE_LATE_BOUND = 1 << 15; + + /// Does this have any `ReErased` regions? + const HAS_RE_ERASED = 1 << 16; + + /// Does this value have parameters/placeholders/inference variables which could be + /// replaced later, in a way that would change the results of `impl` specialization? + const STILL_FURTHER_SPECIALIZABLE = 1 << 17; + } +} + +rustc_index::newtype_index! { + /// A [De Bruijn index][dbi] is a standard means of representing + /// regions (and perhaps later types) in a higher-ranked setting. In + /// particular, imagine a type like this: + /// + /// for<'a> fn(for<'b> fn(&'b isize, &'a isize), &'a char) + /// ^ ^ | | | + /// | | | | | + /// | +------------+ 0 | | + /// | | | + /// +----------------------------------+ 1 | + /// | | + /// +----------------------------------------------+ 0 + /// + /// In this type, there are two binders (the outer fn and the inner + /// fn). We need to be able to determine, for any given region, which + /// fn type it is bound by, the inner or the outer one. There are + /// various ways you can do this, but a De Bruijn index is one of the + /// more convenient and has some nice properties. The basic idea is to + /// count the number of binders, inside out. Some examples should help + /// clarify what I mean. + /// + /// Let's start with the reference type `&'b isize` that is the first + /// argument to the inner function. This region `'b` is assigned a De + /// Bruijn index of 0, meaning "the innermost binder" (in this case, a + /// fn). The region `'a` that appears in the second argument type (`&'a + /// isize`) would then be assigned a De Bruijn index of 1, meaning "the + /// second-innermost binder". (These indices are written on the arrays + /// in the diagram). + /// + /// What is interesting is that De Bruijn index attached to a particular + /// variable will vary depending on where it appears. For example, + /// the final type `&'a char` also refers to the region `'a` declared on + /// the outermost fn. But this time, this reference is not nested within + /// any other binders (i.e., it is not an argument to the inner fn, but + /// rather the outer one). Therefore, in this case, it is assigned a + /// De Bruijn index of 0, because the innermost binder in that location + /// is the outer fn. + /// + /// [dbi]: https://en.wikipedia.org/wiki/De_Bruijn_index + pub struct DebruijnIndex { + DEBUG_FORMAT = "DebruijnIndex({})", + const INNERMOST = 0, + } +} + +impl DebruijnIndex { + /// Returns the resulting index when this value is moved into + /// `amount` number of new binders. So, e.g., if you had + /// + /// for<'a> fn(&'a x) + /// + /// and you wanted to change it to + /// + /// for<'a> fn(for<'b> fn(&'a x)) + /// + /// you would need to shift the index for `'a` into a new binder. + #[must_use] + pub fn shifted_in(self, amount: u32) -> DebruijnIndex { + DebruijnIndex::from_u32(self.as_u32() + amount) + } + + /// Update this index in place by shifting it "in" through + /// `amount` number of binders. + pub fn shift_in(&mut self, amount: u32) { + *self = self.shifted_in(amount); + } + + /// Returns the resulting index when this value is moved out from + /// `amount` number of new binders. + #[must_use] + pub fn shifted_out(self, amount: u32) -> DebruijnIndex { + DebruijnIndex::from_u32(self.as_u32() - amount) + } + + /// Update in place by shifting out from `amount` binders. + pub fn shift_out(&mut self, amount: u32) { + *self = self.shifted_out(amount); + } + + /// Adjusts any De Bruijn indices so as to make `to_binder` the + /// innermost binder. That is, if we have something bound at `to_binder`, + /// it will now be bound at INNERMOST. This is an appropriate thing to do + /// when moving a region out from inside binders: + /// + /// ``` + /// for<'a> fn(for<'b> for<'c> fn(&'a u32), _) + /// // Binder: D3 D2 D1 ^^ + /// ``` + /// + /// Here, the region `'a` would have the De Bruijn index D3, + /// because it is the bound 3 binders out. However, if we wanted + /// to refer to that region `'a` in the second argument (the `_`), + /// those two binders would not be in scope. In that case, we + /// might invoke `shift_out_to_binder(D3)`. This would adjust the + /// De Bruijn index of `'a` to D1 (the innermost binder). + /// + /// If we invoke `shift_out_to_binder` and the region is in fact + /// bound by one of the binders we are shifting out of, that is an + /// error (and should fail an assertion failure). + pub fn shifted_out_to_binder(self, to_binder: DebruijnIndex) -> Self { + self.shifted_out(to_binder.as_u32() - INNERMOST.as_u32()) + } +} + +impl HashStable for DebruijnIndex { + fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher) { + self.as_u32().hash_stable(ctx, hasher); + } +}