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.).
130 lines
5.5 KiB
Plaintext
130 lines
5.5 KiB
Plaintext
error[E0277]: `[String; 0]` cannot be safely transmuted into `()`
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--> $DIR/should_require_well_defined_layout.rs:25:52
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LL | assert::is_maybe_transmutable::<repr_rust, ()>();
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| ^^ analyzing the transmutability of `[String; 0]` is not yet supported
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note: required by a bound in `is_maybe_transmutable`
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--> $DIR/should_require_well_defined_layout.rs:12:14
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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::ALIGNMENT
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LL | | .and(Assume::LIFETIMES)
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LL | | .and(Assume::SAFETY)
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LL | | .and(Assume::VALIDITY)
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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 `[String; 0]`
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--> $DIR/should_require_well_defined_layout.rs:26:47
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LL | assert::is_maybe_transmutable::<u128, repr_rust>();
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| ^^^^^^^^^ analyzing the transmutability of `[String; 0]` is not yet supported
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note: required by a bound in `is_maybe_transmutable`
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--> $DIR/should_require_well_defined_layout.rs:12:14
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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::ALIGNMENT
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LL | | .and(Assume::LIFETIMES)
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LL | | .and(Assume::SAFETY)
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LL | | .and(Assume::VALIDITY)
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LL | | }>
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| |__________^ required by this bound in `is_maybe_transmutable`
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error[E0277]: `[String; 1]` cannot be safely transmuted into `()`
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--> $DIR/should_require_well_defined_layout.rs:31:52
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LL | assert::is_maybe_transmutable::<repr_rust, ()>();
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| ^^ analyzing the transmutability of `[String; 1]` is not yet supported
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note: required by a bound in `is_maybe_transmutable`
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--> $DIR/should_require_well_defined_layout.rs:12:14
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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::ALIGNMENT
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LL | | .and(Assume::LIFETIMES)
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LL | | .and(Assume::SAFETY)
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LL | | .and(Assume::VALIDITY)
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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 `[String; 1]`
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--> $DIR/should_require_well_defined_layout.rs:32:47
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LL | assert::is_maybe_transmutable::<u128, repr_rust>();
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| ^^^^^^^^^ analyzing the transmutability of `[String; 1]` is not yet supported
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note: required by a bound in `is_maybe_transmutable`
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--> $DIR/should_require_well_defined_layout.rs:12:14
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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::ALIGNMENT
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LL | | .and(Assume::LIFETIMES)
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LL | | .and(Assume::SAFETY)
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LL | | .and(Assume::VALIDITY)
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LL | | }>
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| |__________^ required by this bound in `is_maybe_transmutable`
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error[E0277]: `[String; 2]` cannot be safely transmuted into `()`
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--> $DIR/should_require_well_defined_layout.rs:37:52
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LL | assert::is_maybe_transmutable::<repr_rust, ()>();
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| ^^ analyzing the transmutability of `[String; 2]` is not yet supported
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note: required by a bound in `is_maybe_transmutable`
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--> $DIR/should_require_well_defined_layout.rs:12:14
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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::ALIGNMENT
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LL | | .and(Assume::LIFETIMES)
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LL | | .and(Assume::SAFETY)
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LL | | .and(Assume::VALIDITY)
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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 `[String; 2]`
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--> $DIR/should_require_well_defined_layout.rs:38:47
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LL | assert::is_maybe_transmutable::<u128, repr_rust>();
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| ^^^^^^^^^ analyzing the transmutability of `[String; 2]` is not yet supported
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note: required by a bound in `is_maybe_transmutable`
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--> $DIR/should_require_well_defined_layout.rs:12:14
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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::ALIGNMENT
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LL | | .and(Assume::LIFETIMES)
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LL | | .and(Assume::SAFETY)
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LL | | .and(Assume::VALIDITY)
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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 6 previous errors
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For more information about this error, try `rustc --explain E0277`.
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