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