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Auto merge of #79169 - LeSeulArtichaut:ty-lib, r=nikomatsakis

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Create `rustc_type_ir`

Decided to start small 😄

This PR creates a `rustc_type_ir` crate as part of the WG-Traits plan to create a shared type library.
~~There already exists a `rustc_ty` crate, so I named the new crate `rustc_ty_library`. However I think it would make sense to rename the current `rustc_ty` to something else (e.g. `rustc_ty_passes`) to free the name for this new crate.~~

r? `@jackh726`
This commit is contained in:
bors 2020-12-12 12:36:18 +00:00
commit 3f2088aa60
6 changed files with 234 additions and 194 deletions
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88
compiler/rustc_middle/src/ty/mod.rs
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@ -56,7 +56,7 @@ pub use self::sty::InferTy::*;
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::{ExistentialProjection, PolyExistentialProjection};
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.