8c9e3749a1
Do not ignore uninhabited types for function-call ABI purposes. (Remove BackendRepr::Uninhabited) Accepted MCP: https://github.com/rust-lang/compiler-team/issues/832 Fixes #135802 Do not consider the inhabitedness of a type for function call ABI purposes. * Remove the [`rustc_abi::BackendRepr::Uninhabited`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_abi/enum.BackendRepr.html) variant * Instead calculate the `BackendRepr` of uninhabited types "normally" (as though they were not uninhabited "at the top level", but still considering inhabitedness of variants to determine enum layout, etc) * Add an `uninhabited: bool` field to [`rustc_abi::LayoutData`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_abi/struct.LayoutData.html) so inhabitedness of a `LayoutData` can still be queried when necessary (e.g. when determining if an enum variant needs a tag value allocated to it). This should not affect type layouts (size/align/field offset); this should only affect function call ABI, and only of uninhabited types. cc ``@RalfJung`` |
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| README.md | ||
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.