bors [Wed, 16 Mar 2022 09:39:22 +0000 (09:39 +0000)]
Auto merge of #8547 - Jarcho:transmute_8501, r=flip1995
More `transmute_undefined_repr` fixes
fixes: #8498
fixes: #8501
fixes: #8503
changelog: Allow `transumte_undefined_repr` between fat pointers and `(usize, usize)`
changelog: Allow `transumte_undefined_repr` when one side is a union
changelog: Fix `transumte_undefined_repr` on tuples with one non-zero-sized type.
bors [Mon, 14 Mar 2022 23:39:50 +0000 (23:39 +0000)]
Auto merge of #8537 - xFrednet:7923-single-component-path-imports-for-macros, r=llogiq
Allow `single_component_path_imports` for all macros
Closes: https://github.com/rust-lang/rust-clippy/issues/7923
It can be useful to have `use macro_name` regardless of the visibility. This removes the visibility filter.
changelog: [`single_component_path_imports`]: no longer triggers on macros
The suggestion seems to work well, as we've received no error reports since the implementation in December. This PR therefore promotes the suggestion to `MachineApplicable`. The tests already include `.fixed` files :)
changelog: [`search_is_some`]: Make more suggestions `MachineApplicable`
This commit makes `AdtDef` use `Interned`. Much the commit is tedious
changes to introduce getter functions. The interesting changes are in
`compiler/rustc_middle/src/ty/adt.rs`.
bors [Mon, 7 Mar 2022 18:06:31 +0000 (18:06 +0000)]
Auto merge of #94706 - matthiaskrgr:rollup-l5erynr, r=matthiaskrgr
Rollup of 4 pull requests
Successful merges:
- #93350 (libunwind: readd link attrs to _Unwind_Backtrace)
- #93827 (Stabilize const_fn_fn_ptr_basics, const_fn_trait_bound, and const_impl_trait)
- #94696 (Remove whitespaces and use CSS to align line numbers to the right instead)
- #94700 (rustdoc: Update minifier version)
`Layout` is another type that is sometimes interned, sometimes not, and
we always use references to refer to it so we can't take any advantage
of the uniqueness properties for hashing or equality checks.
This commit renames `Layout` as `LayoutS`, and then introduces a new
`Layout` that is a newtype around an `Interned<LayoutS>`. It also
interns more layouts than before. Previously layouts within layouts
(via the `variants` field) were never interned, but now they are. Hence
the lifetime on the new `Layout` type.
Unlike other interned types, these ones are in `rustc_target` instead of
`rustc_middle`. This reflects the existing structure of the code, which
does layout-specific stuff in `rustc_target` while `TyAndLayout` is
generic over the `Ty`, allowing the type-specific stuff to occur in
`rustc_middle`.
The commit also adds a `HashStable` impl for `Interned`, which was
needed. It hashes the contents, unlike the `Hash` impl which hashes the
pointer.
Currently some `Allocation`s are interned, some are not, and it's very
hard to tell at a use point which is which.
This commit introduces `ConstAllocation` for the known-interned ones,
which makes the division much clearer. `ConstAllocation::inner()` is
used to get the underlying `Allocation`.
In some places it's natural to use an `Allocation`, in some it's natural
to use a `ConstAllocation`, and in some places there's no clear choice.
I've tried to make things look as nice as possible, while generally
favouring `ConstAllocation`, which is the type that embodies more
information. This does require quite a few calls to `inner()`.
The commit also tweaks how `PartialOrd` works for `Interned`. The
previous code was too clever by half, building on `T: Ord` to make the
code shorter. That caused problems with deriving `PartialOrd` and `Ord`
for `ConstAllocation`, so I changed it to build on `T: PartialOrd`,
which is slightly more verbose but much more standard and avoided the
problems.
bors [Sun, 6 Mar 2022 07:46:56 +0000 (07:46 +0000)]
Auto merge of #8445 - asquared31415:slice_ptr_cast, r=llogiq
Llint for casting between raw slice pointers with different element sizes
This lint disallows using `as` to convert from a raw pointer to a slice (e.g. `*const [i32]`, `*mut [Foo]`) to any other raw pointer to a slice if the element types have different sizes. When a raw slice pointer is cast, the data pointer and count metadata are preserved. This means that when the size of the inner slice's element type changes, the total number of bytes pointed to by the count changes. For example a `*const [i32]` with length 4 (four `i32` elements) is cast `as *const [u8]` the resulting pointer points to four `u8` elements at the same address, losing most of the data. When the size *increases* the resulting pointer will point to *more* data, and accessing that data will be UB.
On its own, *producing* the pointer isn't actually a problem, but because any use of the pointer as a slice will either produce surprising behavior or cause UB I believe this is a correctness lint. If the pointer is not intended to be used as a slice, the user should instead use any of a number of methods to produce just a data pointer including an `as` cast to a thin pointer (e.g. `p as *const i32`) or if the pointer is being created from a slice, the `as_ptr` method on slices. Detecting the intended use of the pointer is outside the scope of this lint, but I believe this lint will also lead users to realize that a slice pointer is only for slices.
There is an exception to this lint when either of the slice element types are zero sized (e.g `*mut [()]`). The total number of bytes pointed to by the slice with a zero sized element is zero. In that case preserving the length metadata is likely intended as a workaround to get the length metadata of a slice pointer though a zero sized slice.
The lint does not forbid casting pointers to slices with the *same* element size as the cast was likely intended to reinterpret the data in the slice as some equivalently sized data and the resulting pointer will behave as intended.
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changelog: Added ``[`cast_slice_different_sizes`]``, a lint that disallows using `as`-casts to convert between raw pointers to slices when the elements have different sizes.
Esteban Kuber [Fri, 21 Jan 2022 00:15:39 +0000 (00:15 +0000)]
Do not point at whole file missing `fn main`
Only point at the end of the crate. We could try making it point at the
beginning of the crate, but that is confused with `DUMMY_SP`, causing
the output to be *worse*.
This change will make it so that VSCode will *not* underline the whole
file when `main` is missing, so other errors will be visible.
bors [Fri, 4 Mar 2022 19:23:39 +0000 (19:23 +0000)]
Auto merge of #8504 - xFrednet:8502-allow-lint-without-reason, r=flip1995
Add lint to detect `allow` attributes without reason
I was considering putting this lint into the pedantic group. However, that would result in countless warnings for existing projects. Having it in restriction also seems good to me :upside_down_face: (And now I need sleep :zzz: )
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changelog: New lint [`allow_lint_without_reason`] (Requires the `lint_reasons` feature)
bors [Thu, 3 Mar 2022 12:56:24 +0000 (12:56 +0000)]
Auto merge of #94512 - RalfJung:sdiv-ub, r=oli-obk
Miri/CTFE: properly treat overflow in (signed) division/rem as UB
To my surprise, it looks like LLVM treats overflow of signed div/rem as UB. From what I can tell, MIR `Div`/`Rem` directly lowers to the corresponding LLVM operation, so to make that correct we also have to consider these overflows UB in the CTFE/Miri interpreter engine.
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