rust/compiler/rustc_const_eval/src/interpret/operand.rs, branch 1.60.0

Overhaul `Const`.

2022-02-15T05:19:59+00:00

Specifically, rename the `Const` struct as `ConstS` and re-introduce `Const` as this: ``` pub struct Const<'tcx>(&'tcx Interned); ``` This now matches `Ty` and `Predicate` more closely, including using pointer-based `eq` and `hash`. Notable changes: - `mk_const` now takes a `ConstS`. - `Const` was copy, despite being 48 bytes. Now `ConstS` is not, so need a we need separate arena for it, because we can't use the `Dropless` one any more. - Many `&'tcx Const<'tcx>`/`&Const<'tcx>` to `Const<'tcx>` changes - Many `ct.ty` to `ct.ty()` and `ct.val` to `ct.val()` changes. - Lots of tedious sigil fiddling.

Overhaul `TyS` and `Ty`.

2022-02-15T05:03:24+00:00

Specifically, change `Ty` from this: ``` pub type Ty<'tcx> = &'tcx TyS<'tcx>; ``` to this ``` pub struct Ty<'tcx>(Interned<'tcx, TyS<'tcx>>); ``` There are two benefits to this. - It's now a first class type, so we can define methods on it. This means we can move a lot of methods away from `TyS`, leaving `TyS` as a barely-used type, which is appropriate given that it's not meant to be used directly. - The uniqueness requirement is now explicit, via the `Interned` type. E.g. the pointer-based `Eq` and `Hash` comes from `Interned`, rather than via `TyS`, which wasn't obvious at all. Much of this commit is boring churn. The interesting changes are in these files: - compiler/rustc_middle/src/arena.rs - compiler/rustc_middle/src/mir/visit.rs - compiler/rustc_middle/src/ty/context.rs - compiler/rustc_middle/src/ty/mod.rs Specifically: - Most mentions of `TyS` are removed. It's very much a dumb struct now; `Ty` has all the smarts. - `TyS` now has `crate` visibility instead of `pub`. - `TyS::make_for_test` is removed in favour of the static `BOOL_TY`, which just works better with the new structure. - The `Eq`/`Ord`/`Hash` impls are removed from `TyS`. `Interned`s impls of `Eq`/`Hash` now suffice. `Ord` is now partly on `Interned` (pointer-based, for the `Equal` case) and partly on `TyS` (contents-based, for the other cases). - There are many tedious sigil adjustments, i.e. adding or removing `*` or `&`. They seem to be unavoidable.

initial revert

2022-01-15T01:16:55+00:00

Remove `in_band_lifetimes` from `rustc_const_eval`

2021-12-14T03:39:00+00:00

See #91867 for more information.

allow for failure of subst_normalize_erasing_regions in const_eval

2021-12-05T11:43:39+00:00

fix CTFE/Miri simd_insert/extract on array-style repr(simd) types

2021-11-18T14:10:35+00:00

add dedicated error variant for writing the discriminant of an uninhabited enum variant

2021-10-14T14:03:20+00:00

Make `abi::Abi` `Copy` and remove a lot of refs

2021-09-09T08:41:19+00:00

fix fix Remove more refs and clones fix more fix

Rename rustc_mir to rustc_const_eval.

2021-09-07T18:46:26+00:00