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10 Commits

Author SHA1 Message Date
mu001999
e7f11b6913 Removes dead code from the compiler 2024-08-25 13:41:39 +08:00
Nicholas Nethercote
84ac80f192 Reformat use declarations. 
The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.
 2024-07-29 08:26:52 +10:00
Jack Wrenn
3aa14e3b2e Compute transmutability from rustc_target::abi::Layout 
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.).
 2024-04-08 15:36:52 +00:00
Jack Wrenn
23ab1bda92 safe transmute: revise safety analysis 
Migrate to a simplified safety analysis that does not use visibility.

Closes https://github.com/rust-lang/project-safe-transmute/issues/15
 2024-02-27 16:22:32 +00:00
Vadim Petrochenkov
c83553da31 rustc_middle: Remove trait DefIdTree 
This trait was a way to generalize over both `TyCtxt` and `Resolver`, but now `Resolver` has access to `TyCtxt`, so this trait is no longer necessary.
 2023-03-02 23:46:44 +04:00
Matthias Krüger
1da4a49912 clippy::complexity fixes 
filter_next
needless_question_mark
bind_instead_of_map
manual_find
derivable_impls
map_identity
redundant_slicing
skip_while_next
unnecessary_unwrap
needless_bool
 2022-12-19 00:04:28 +01:00
Oli Scherer
ee3c835018 Always import all tracing macros for the entire crate instead of piecemeal by module 2022-09-01 14:54:27 +00:00
Jack Wrenn
aee5f31c68 safe transmute: lowercase tracing levels 
ref: https://github.com/rust-lang/rust/pull/92268#discussion_r927095154
 2022-07-27 17:33:57 +00:00
Jack Wrenn
c0d0ce95eb safe transmute: tweak tracing 
ref: https://github.com/rust-lang/rust/pull/92268#discussion_r925246903
ref: https://github.com/rust-lang/rust/pull/92268#discussion_r925250811
ref: https://github.com/rust-lang/rust/pull/92268#discussion_r925255782
 2022-07-27 17:33:56 +00:00
Jack Wrenn
bc4a1dea41 Initial (incomplete) implementation of transmutability trait. 
This initial implementation handles transmutations between types with specified layouts, except when references are involved.

Co-authored-by: Igor null <m1el.2027@gmail.com>
 2022-07-27 17:33:56 +00:00