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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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| .. | ||
| huge-len.rs | ||
| huge-len.stderr | ||
| issue-103783-array-length.rs | ||
| issue-103783-array-length.stderr | ||
| should_have_correct_length.rs | ||
| should_inherit_alignment.rs | ||
| should_require_well_defined_layout.rs | ||
| should_require_well_defined_layout.stderr | ||