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3aa14e3b2e
In its first step of computing transmutability, `rustc_transmutability` constructs a byte-level representation of type layout (`Tree`). Previously, this representation was computed for ADTs by inspecting the ADT definition and performing our own layout computations. This process was error-prone, verbose, and limited our ability to analyze many types (particularly default-repr types). In this PR, we instead construct `Tree`s from `rustc_target::abi::Layout`s. This helps ensure that layout optimizations are reflected our analyses, and increases the kinds of types we can now analyze, including: - default repr ADTs - transparent unions - `UnsafeCell`-containing types Overall, this PR expands the expressvity of `rustc_transmutability` to be much closer to the transmutability analysis performed by miri. Future PRs will work to close the remaining gaps (e.g., support for `Box`, raw pointers, `NonZero*`, coroutines, etc.). |
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| .. | ||
| recursive-wrapper-types-bit-compatible-mut.rs | ||
| recursive-wrapper-types-bit-compatible-mut.stderr | ||
| recursive-wrapper-types-bit-compatible.rs | ||
| recursive-wrapper-types-bit-incompatible.rs | ||
| recursive-wrapper-types-bit-incompatible.stderr | ||
| recursive-wrapper-types.rs | ||
| reject_extension.rs | ||
| reject_extension.stderr | ||
| u8-to-unit.rs | ||
| unit-to-itself.rs | ||
| unit-to-u8.rs | ||
| unit-to-u8.stderr | ||
| unsafecell.rs | ||
| unsafecell.stderr | ||