* simplify `ToTokens` impl for `Representation`
Instead of collecting the representation and modifier into `Option`s
and determining whether a comma is needed manually, we can use the
`Puncutuated` struct which handles commas automatically.
This will also make emitting the `align` modifier in the future easier.
* emit alignment modifier
This is required for correctly implementing `CheckedBitPattern` because
we need the layout of the type and its `Bits` type to have the same
layout.
* add unit test for `#[repr]` parsing
* allow multiple alignment modifiers
According to RFC #1358, if multiple alignment modifiers are specified,
the resulting alignment is the maximum of all alignment modifiers.
* actually return the error we just created
* factor out the integer Repr's into their own type
This is a preparation step for adding support for `#[repr(C, int)]`.
* allow parsing `#[repr(C, int)]`
This can be used on enums with fields.
* derive `CheckedBitPattern` for enums with fields
The implementation mostly mirrors the desugaring described at
https://doc.rust-lang.org/reference/type-layout.html
* add comments and rename some idents
* update error message
* update docs for `CheckedBitPattern` derive
* add new nested test case, change generated type naming scheme
* fix wrong comment
* small nit
---------
Co-authored-by: Gray Olson <gray@grayolson.com>
* Add functions for writing zeroed bytes to `&mut impl Zeroable` and `&mut [impl Zeroable]`
* Support `T: !Copy` in `fill_zero`/`write_zero`
* Zero bytes in the drop guard for write_zero
* Update src/lib.rs
Co-authored-by: Alphyr <47725341+a1phyr@users.noreply.github.com>
---------
Co-authored-by: Lokathor <zefria@gmail.com>
Co-authored-by: Alphyr <47725341+a1phyr@users.noreply.github.com>
`from_integer` and `into_integer` are usually provided by the trait's
default implementation. We override this implementation because it goes
through `transmute_copy`, which can lead to inefficient assembly as seen
in https://github.com/Lokathor/bytemuck/issues/175 .
- new feature `nightly_docs` enables `doc_cfg` unstable feature that allows showing explicit dependencies on features.
- new cargo alias `nightly_docs` for a more convenient local documentation build `cargo +nightly nightly_docs --open`.
- annotate exported items and implementations depending on some feature with the corresponding `doc(cfg())` attribute.
- add the `nightly_docs` feature to the `[package.metadata.docs.rs]` section.
Doctests only run in the crate proper; doctests inside of integration tests are not run.
Move the existing doctests from derive/tests/basic.rs to derive/lib.rs, expanding them to make them
better for documentation as well.
* Add space because rust-analyzer thinks it's a weird literal otherwise.
* Add custom bounds for Zeroable.
* Cleanup custom bounds code.
* Only parse explicit bounds for Zeroable.
* Qualify syn types.
* If no explicit bounds are given, apply the default bounds.
* Add perfect derive semantics to `#[zeroable(bound = "...")]`.
* cargo fmt src/must.rs
* Fix must.rs test failures.
* Under miri, use should_panic instead of compile_fail for must_cast doctests.
* Add description for workaround.
This upgrades the derives from `syn` 1.0 to `syn` 2.0. While the MSRV
for `syn` 2.0 is not Rust 1.56 which is higher than the MSRV of
`bytemuck`, the derives don't fall under the MSRV policy.
Uses the compiler to check that all non-wrapped fields are actually 1-ZSTs,
and uses Zeroable to check that all non-wrapped fields are "conjurable".
Additionally, relaxes the bound of `PhantomData<T: Zeroable>: Zeroable` to all `T: ?Sized`.
* parse `repr(usize)` and `repr(isize)`
This can be used with enums.
* emit packed repr without type suffix
Previously we emitted the packed attribute with a type suffix for the
value `packed(4u32)`. This is not allowed. Instead we should emit
`packed(4)`.
* read bits instead of creating reference
This is required for packed structs where creating a reference to
fields is not allowed. We can make a copy of the bits because the bits
are `AnyBitPattern` which implies `Copy`.
* emit generics on implied traits
