mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-30 18:53:39 +00:00
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.).
87 lines
3.2 KiB
Plaintext
87 lines
3.2 KiB
Plaintext
error[E0080]: evaluation of constant value failed
|
|
--> $DIR/uninhabited.rs:41:9
|
|
|
|
|
LL | assert!(false);
|
|
| ^^^^^^^^^^^^^^ the evaluated program panicked at 'assertion failed: false', $DIR/uninhabited.rs:41:9
|
|
|
|
|
= note: this error originates in the macro `assert` (in Nightly builds, run with -Z macro-backtrace for more info)
|
|
|
|
error[E0080]: evaluation of constant value failed
|
|
--> $DIR/uninhabited.rs:65:9
|
|
|
|
|
LL | assert!(false);
|
|
| ^^^^^^^^^^^^^^ the evaluated program panicked at 'assertion failed: false', $DIR/uninhabited.rs:65:9
|
|
|
|
|
= note: this error originates in the macro `assert` (in Nightly builds, run with -Z macro-backtrace for more info)
|
|
|
|
error[E0277]: `()` cannot be safely transmuted into `void::Void`
|
|
--> $DIR/uninhabited.rs:29:41
|
|
|
|
|
LL | assert::is_maybe_transmutable::<(), Void>();
|
|
| ^^^^ `void::Void` is uninhabited
|
|
|
|
|
note: required by a bound in `is_maybe_transmutable`
|
|
--> $DIR/uninhabited.rs:10:14
|
|
|
|
|
LL | pub fn is_maybe_transmutable<Src, Dst>()
|
|
| --------------------- required by a bound in this function
|
|
LL | where
|
|
LL | Dst: BikeshedIntrinsicFrom<Src, {
|
|
| ______________^
|
|
LL | | Assume {
|
|
LL | | alignment: true,
|
|
LL | | lifetimes: true,
|
|
... |
|
|
LL | | }
|
|
LL | | }>
|
|
| |__________^ required by this bound in `is_maybe_transmutable`
|
|
|
|
error[E0277]: `()` cannot be safely transmuted into `yawning_void::Void`
|
|
--> $DIR/uninhabited.rs:49:41
|
|
|
|
|
LL | assert::is_maybe_transmutable::<(), Void>();
|
|
| ^^^^ `yawning_void::Void` is uninhabited
|
|
|
|
|
note: required by a bound in `is_maybe_transmutable`
|
|
--> $DIR/uninhabited.rs:10:14
|
|
|
|
|
LL | pub fn is_maybe_transmutable<Src, Dst>()
|
|
| --------------------- required by a bound in this function
|
|
LL | where
|
|
LL | Dst: BikeshedIntrinsicFrom<Src, {
|
|
| ______________^
|
|
LL | | Assume {
|
|
LL | | alignment: true,
|
|
LL | | lifetimes: true,
|
|
... |
|
|
LL | | }
|
|
LL | | }>
|
|
| |__________^ required by this bound in `is_maybe_transmutable`
|
|
|
|
error[E0277]: `u128` cannot be safely transmuted into `DistantVoid`
|
|
--> $DIR/uninhabited.rs:70:43
|
|
|
|
|
LL | assert::is_maybe_transmutable::<u128, DistantVoid>();
|
|
| ^^^^^^^^^^^ at least one value of `u128` isn't a bit-valid value of `DistantVoid`
|
|
|
|
|
note: required by a bound in `is_maybe_transmutable`
|
|
--> $DIR/uninhabited.rs:10:14
|
|
|
|
|
LL | pub fn is_maybe_transmutable<Src, Dst>()
|
|
| --------------------- required by a bound in this function
|
|
LL | where
|
|
LL | Dst: BikeshedIntrinsicFrom<Src, {
|
|
| ______________^
|
|
LL | | Assume {
|
|
LL | | alignment: true,
|
|
LL | | lifetimes: true,
|
|
... |
|
|
LL | | }
|
|
LL | | }>
|
|
| |__________^ required by this bound in `is_maybe_transmutable`
|
|
|
|
error: aborting due to 5 previous errors
|
|
|
|
Some errors have detailed explanations: E0080, E0277.
|
|
For more information about an error, try `rustc --explain E0080`.
|