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Remove the ThinLTO CU hack
This reverts #46722, commit e0ab5d5feb4eb2d8af11b8dd9446c2b45fada8af.
Since #111167, commit 10b69dde3fd15334ea2382d2dc9e9a261de1afaf, we are
generating DWARF subprograms in a way that is meant to be more compatible
with LLVM's expectations, so hopefully we don't need this workaround
rewriting CUs anymore.
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This reverts #46722, commit e0ab5d5feb4eb2d8af11b8dd9446c2b45fada8af.
Since #111167, commit 10b69dde3fd15334ea2382d2dc9e9a261de1afaf, we are
generating DWARF subprograms in a way that is meant to be more compatible
with LLVM's expectations, so hopefully we don't need this workaround
rewriting CUs anymore.
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Update to LLVM 16.0.4
Fixes #109918.
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Stop turning transmutes into discriminant reads in mir-opt
Partially reverts #109612, as after #109993 these aren't actually equivalent any more, and I'm no longer confident this was ever an improvement in the first place.
Having this "simplification" meant that similar-looking code actually did somewhat different things. For example,
```rust
pub unsafe fn demo1(x: std::cmp::Ordering) -> u8 {
std::mem::transmute(x)
}
pub unsafe fn demo2(x: std::cmp::Ordering) -> i8 {
std::mem::transmute(x)
}
```
in nightly today is generating <https://rust.godbolt.org/z/dPK58zW18>
```llvm
define noundef i8 `@_ZN7example5demo117h341ef313673d2ee6E(i8` noundef %x) unnamed_addr #0 {
%0 = icmp uge i8 %x, -1
%1 = icmp ule i8 %x, 1
%2 = or i1 %0, %1
call void `@llvm.assume(i1` %2)
ret i8 %x
}
define noundef i8 `@_ZN7example5demo217h5ad29f361a3f5700E(i8` noundef %0) unnamed_addr #0 {
%x = alloca i8, align 1
store i8 %0, ptr %x, align 1
%1 = load i8, ptr %x, align 1, !range !2, !noundef !3
ret i8 %1
}
```
Which feels too different when the original code is essentially identical.
---
Aside: that example is different *after* optimizations too:
```llvm
define noundef i8 `@_ZN7example5demo117h341ef313673d2ee6E(i8` noundef returned %x) unnamed_addr #0 {
%0 = add i8 %x, 1
%1 = icmp ult i8 %0, 3
tail call void `@llvm.assume(i1` %1)
ret i8 %x
}
define noundef i8 `@_ZN7example5demo217h5ad29f361a3f5700E(i8` noundef returned %0) unnamed_addr #1 {
ret i8 %0
}
```
so turning the `Transmute` into a `Discriminant` was arguably just making things worse, so leaving it alone instead -- and thus having less code in rustc -- seems clearly better.
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Partially reverts 109612, as after 109993 these aren't actually equivalent any more, and I'm no longer confident this was ever an improvement in the first place.
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Rollup of 6 pull requests
Successful merges:
- #110930 (Don't expect normalization to succeed in elaborate_drops)
- #111557 (Revert "Validate resolution for SelfCtor too.")
- #111565 (rustdoc-json: Add tests for visibility of impls)
- #111588 (Emits E0599 when meeting `MyTrait::missing_method`)
- #111625 (Move rustc_middle/src/ty/query.rs to rustc_middle/src/query/plumbing.rs)
- #111674 (Add missing backslash in HTML string)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
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Add missing backslash in HTML string
Found this missing one when looking at code.
r? `@notriddle`
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Move rustc_middle/src/ty/query.rs to rustc_middle/src/query/plumbing.rs
This just keeps the query modules together.
r? `@cjgillot`
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Emits E0599 when meeting `MyTrait::missing_method`
Fixes #111312
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rustdoc-json: Add tests for visibility of impls
[Apparrently rustdoc use to give these `crate` instead of `default`](https://github.com/obi1kenobi/trustfall-rustdoc-adapter/compare/rustdoc-v24...rustdoc-v25#diff-58e57a0fc73d1353fa3a057f0fe81c6ecfd4548b429cef1aee36b1c84d8d15a4L366). CC `@obi1kenobi`
The output is arguably still buggy as to weather some of these impls should be stripped, but that's a seperate issue and shouldn't block adding these tests (#111564)
r? `@GuillaumeGomez`
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Revert "Validate resolution for SelfCtor too."
This reverts commit 83453408a0ce91b9e3d3ae6e7f117b1fd28b487d.
That PR introduced a breaking change.
Fixes https://github.com/rust-lang/rust/issues/111541
Reopens https://github.com/rust-lang/rust/issues/89868
r? `@petrochenkov`
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This reverts commit 83453408a0ce91b9e3d3ae6e7f117b1fd28b487d.
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Don't expect normalization to succeed in elaborate_drops
Fixes https://github.com/rust-lang/rust/issues/110682
This was exposed through the changes in https://github.com/rust-lang/rust/pull/109247, which causes more things to be inlined. Inlining can happen before monomorphization, so we can't expect normalization to succeed. In the elaborate_drops analysis we currently have [this call](https://github.com/rust-lang/rust/blob/033aa092ab23ba14cdad27073c5e37ba0eddb428/compiler/rustc_mir_dataflow/src/elaborate_drops.rs#L278) to `normalize_erasing_regions`, which ICEs when normalization fails. The types are used to infer [whether the type needs a drop](https://github.com/rust-lang/rust/blob/033aa092ab23ba14cdad27073c5e37ba0eddb428/compiler/rustc_mir_dataflow/src/elaborate_drops.rs#L374), where `needs_drop` itself [uses `try_normalize_erasing_regions`](https://github.com/rust-lang/rust/blob/033aa092ab23ba14cdad27073c5e37ba0eddb428/compiler/rustc_middle/src/ty/util.rs#L1121).
~[`instance_mir`](https://doc.rust-lang.org/stable/nightly-rustc/rustc_middle/ty/context/struct.TyCtxt.html#method.instance_mir) isn't explicit about whether it expects the instances corresponding to the `InstanceDef`s to be monomorphized (though I think in all other contexts the function is used post-monomorphization), so the use of `instance_mir` in inlining doesn't necessarily seem wrong to me.~
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in DropGlue.
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Rollup of 6 pull requests
Successful merges:
- #110145 (Share slice of bytes)
- #111043 (Stabilize feature `cstr_is_empty`)
- #111648 (Remove `LangItems::require`)
- #111649 (Add derive for `core::marker::ConstParamTy`)
- #111654 (Add a conversion from `&mut T` to `&mut UnsafeCell<T>`)
- #111661 (Erase regions of type in `offset_of!`)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
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Erase regions of type in `offset_of!`
Fixes #111657
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Add a conversion from `&mut T` to `&mut UnsafeCell<T>`
Provides a safe way of downgrading an exclusive reference into an alias-able `&UnsafeCell<T>` reference.
ACP: https://github.com/rust-lang/libs-team/issues/198.
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Add derive for `core::marker::ConstParamTy`
This makes it easier to implement it for a type, just like `Copy`.
`@BoxyUwU` half asked me to add it
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This makes it easier to implement it for a type, just like `Copy`.
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Remove `LangItems::require`
It's just a short wrapper used by `tcx.require_lang_item`. Deleting it gives us a negative diff.
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It's just a short wrapper used by `tcx.require_lang_item`. Deleting it
gives us a negative diff.
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Stabilize feature `cstr_is_empty`
Fixes #102444
ACP: https://github.com/rust-lang/libs-team/issues/106
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Share slice of bytes
r? `@Nilstrieb`
cc `@noamtashma`
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debug format `Const`'s less verbosely
Not user visible change only visible to people debugging const generics.
Currently debug output for `ty::Const` is super verbose (even for `-Zverbose` lol), things like printing infer vars as `Infer(Var(?0c))` instead of just `?0c`, bound vars and placeholders not using `^0_1` or `!0_1` syntax respectively. With these changes its imo better but not perfect:
`Const { ty: usize, kind: ^0_1 }`
is still a lot for not much information. not entirely sure what to do about that so not dealing with it yet.
Need to do formatting for `ConstKind::Expr` at some point too since rn it sucks (doesn't even print anything with `Display`) not gonna do that in this PR either.
r? `@compiler-errors`
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Update cargo
8 commits in 13413c64ff88dd6c2824e9eb9374fc5f10895d28..09276c703a473ab33daaeb94917232e80eefd628
2023-05-10 13:46:18 +0000 to 2023-05-16 21:43:35 +0000
- docs: Clarify that crates.io doesn't link to docs.rs right away. (rust-lang/cargo#12146)
- docs(ref): Clarify MSRV is generally minor (rust-lang/cargo#12122)
- Fix `check_for_file_and_add`'s check for conflict file (rust-lang/cargo#12135)
- Fixes: Incorrect document link (rust-lang/cargo#12143)
- doc: intra-doc links and doc comments for build script (rust-lang/cargo#12133)
- Add Cargo team charter. (rust-lang/cargo#12010)
- Remove useless drop of copy type (rust-lang/cargo#12136)
- Fix dep/feat syntax with hidden implicit optional dependencies (rust-lang/cargo#12130)
r? ghost
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Merge return place with other locals in CopyProp.
This reintroduces a limited form of NRVO.
r? wg-mir-opt
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Rollup of 7 pull requests
Successful merges:
- #107680 (Hide repr attribute from doc of types without guaranteed repr)
- #111488 (Use error term in projection if missing associated item in new solver)
- #111533 (Handle error body in generator layout)
- #111573 (Erase `ReError` properly)
- #111592 (Change Vec examples to not assert exact capacity except where it is guaranteed)
- #111610 (fix(diagnostic): wrap parens for ref impl trait param)
- #111642 ([rustdoc] Only keep impl blocks from bodies)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
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[rustdoc] Only keep impl blocks from bodies
Fixes https://github.com/rust-lang/rust/issues/111415.
The problem was that we kept everything inside bodies whereas only impl blocks are actually accessible from outside bodies.
r? `@notriddle`
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