diff options
Diffstat (limited to 'tests/ui/transmutability/structs')
5 files changed, 483 insertions, 0 deletions
diff --git a/tests/ui/transmutability/structs/repr/should_handle_align.rs b/tests/ui/transmutability/structs/repr/should_handle_align.rs new file mode 100644 index 000000000..ea9bf2a23 --- /dev/null +++ b/tests/ui/transmutability/structs/repr/should_handle_align.rs @@ -0,0 +1,43 @@ +// check-pass +//! The presence of an `align(X)` annotation must be accounted for. + +#![crate_type = "lib"] +#![feature(transmutability)] +#![allow(dead_code, incomplete_features, non_camel_case_types)] + +mod assert { + use std::mem::{Assume, BikeshedIntrinsicFrom}; + pub struct Context; + + pub fn is_maybe_transmutable<Src, Dst>() + where + Dst: BikeshedIntrinsicFrom<Src, Context, { + Assume { + alignment: true, + lifetimes: true, + safety: true, + validity: true, + } + }> + {} +} + +fn should_pad_explicitly_aligned_field() { + #[derive(Clone, Copy)] #[repr(u8)] enum V0u8 { V = 0 } + + #[repr(C)] + pub union Uninit { + a: (), + b: V0u8, + } + + #[repr(C, align(2))] struct align_2(V0u8); + + #[repr(C)] struct ImplicitlyPadded(align_2, V0u8); + #[repr(C)] struct ExplicitlyPadded(V0u8, Uninit, V0u8); + + // An implementation that (incorrectly) does not place a padding byte after + // `align_2` will, incorrectly, reject the following transmutations. + assert::is_maybe_transmutable::<ImplicitlyPadded, ExplicitlyPadded>(); + assert::is_maybe_transmutable::<ExplicitlyPadded, ImplicitlyPadded>(); +} diff --git a/tests/ui/transmutability/structs/repr/should_handle_packed.rs b/tests/ui/transmutability/structs/repr/should_handle_packed.rs new file mode 100644 index 000000000..17dc995fc --- /dev/null +++ b/tests/ui/transmutability/structs/repr/should_handle_packed.rs @@ -0,0 +1,42 @@ +// check-pass +//! The presence of an `align(X)` annotation must be accounted for. + +#![crate_type = "lib"] +#![feature(transmutability)] +#![allow(dead_code, incomplete_features, non_camel_case_types)] + +mod assert { + use std::mem::{Assume, BikeshedIntrinsicFrom}; + pub struct Context; + + pub fn is_maybe_transmutable<Src, Dst>() + where + Dst: BikeshedIntrinsicFrom<Src, Context, { + Assume { + alignment: true, + lifetimes: true, + safety: true, + validity: true, + } + }> + {} +} + +fn should_pad_explicitly_packed_field() { + #[derive(Clone, Copy)] #[repr(u8)] enum V0u8 { V = 0 } + #[derive(Clone, Copy)] #[repr(u32)] enum V0u32 { V = 0 } + + #[repr(C)] + pub union Uninit { + a: (), + b: V0u8, + } + + #[repr(C, packed(2))] struct ImplicitlyPadded(V0u8, V0u32); + #[repr(C)] struct ExplicitlyPadded(V0u8, Uninit, V0u8, V0u8, V0u8, V0u8); + + // An implementation that (incorrectly) does not place a padding byte after + // `align_2` will, incorrectly, reject the following transmutations. + assert::is_maybe_transmutable::<ImplicitlyPadded, ExplicitlyPadded>(); + assert::is_maybe_transmutable::<ExplicitlyPadded, ImplicitlyPadded>(); +} diff --git a/tests/ui/transmutability/structs/repr/should_require_well_defined_layout.rs b/tests/ui/transmutability/structs/repr/should_require_well_defined_layout.rs new file mode 100644 index 000000000..9a65b4d70 --- /dev/null +++ b/tests/ui/transmutability/structs/repr/should_require_well_defined_layout.rs @@ -0,0 +1,83 @@ +//! A struct must have a well-defined layout to participate in a transmutation. + +#![crate_type = "lib"] +#![feature(transmutability)] +#![allow(dead_code, incomplete_features, non_camel_case_types)] + +mod assert { + use std::mem::{Assume, BikeshedIntrinsicFrom}; + pub struct Context; + + pub fn is_maybe_transmutable<Src, Dst>() + where + Dst: BikeshedIntrinsicFrom<Src, Context, { + Assume { + alignment: true, + lifetimes: true, + safety: true, + validity: true, + } + }> + {} +} + +fn should_reject_repr_rust() +{ + fn unit() { + struct repr_rust; + assert::is_maybe_transmutable::<repr_rust, ()>(); //~ ERROR cannot be safely transmuted + assert::is_maybe_transmutable::<u128, repr_rust>(); //~ ERROR cannot be safely transmuted + } + + fn tuple() { + struct repr_rust(); + assert::is_maybe_transmutable::<repr_rust, ()>(); //~ ERROR cannot be safely transmuted + assert::is_maybe_transmutable::<u128, repr_rust>(); //~ ERROR cannot be safely transmuted + } + + fn braces() { + struct repr_rust{} + assert::is_maybe_transmutable::<repr_rust, ()>(); //~ ERROR cannot be safely transmuted + assert::is_maybe_transmutable::<u128, repr_rust>(); //~ ERROR cannot be safely transmuted + } + + fn aligned() { + #[repr(align(1))] struct repr_rust{} + assert::is_maybe_transmutable::<repr_rust, ()>(); //~ ERROR cannot be safely transmuted + assert::is_maybe_transmutable::<u128, repr_rust>(); //~ ERROR cannot be safely transmuted + } + + fn packed() { + #[repr(packed)] struct repr_rust{} + assert::is_maybe_transmutable::<repr_rust, ()>(); //~ ERROR cannot be safely transmuted + assert::is_maybe_transmutable::<u128, repr_rust>(); //~ ERROR cannot be safely transmuted + } + + fn nested() { + struct repr_rust; + #[repr(C)] struct repr_c(repr_rust); + assert::is_maybe_transmutable::<repr_c, ()>(); //~ ERROR cannot be safely transmuted + assert::is_maybe_transmutable::<u128, repr_c>(); //~ ERROR cannot be safely transmuted + } +} + +fn should_accept_repr_C() +{ + fn unit() { + #[repr(C)] struct repr_c; + assert::is_maybe_transmutable::<repr_c, ()>(); + assert::is_maybe_transmutable::<i128, repr_c>(); + } + + fn tuple() { + #[repr(C)] struct repr_c(); + assert::is_maybe_transmutable::<repr_c, ()>(); + assert::is_maybe_transmutable::<i128, repr_c>(); + } + + fn braces() { + #[repr(C)] struct repr_c{} + assert::is_maybe_transmutable::<repr_c, ()>(); + assert::is_maybe_transmutable::<i128, repr_c>(); + } +} diff --git a/tests/ui/transmutability/structs/repr/should_require_well_defined_layout.stderr b/tests/ui/transmutability/structs/repr/should_require_well_defined_layout.stderr new file mode 100644 index 000000000..621dbee84 --- /dev/null +++ b/tests/ui/transmutability/structs/repr/should_require_well_defined_layout.stderr @@ -0,0 +1,279 @@ +error[E0277]: `should_reject_repr_rust::unit::repr_rust` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:28:52 + | +LL | assert::is_maybe_transmutable::<repr_rust, ()>(); + | ^^ `should_reject_repr_rust::unit::repr_rust` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<should_reject_repr_rust::unit::repr_rust, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `()` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +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 `should_reject_repr_rust::unit::repr_rust` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:29:47 + | +LL | assert::is_maybe_transmutable::<u128, repr_rust>(); + | ^^^^^^^^^ `u128` cannot be safely transmuted into `should_reject_repr_rust::unit::repr_rust` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<u128, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `should_reject_repr_rust::unit::repr_rust` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +LL | | Assume { +LL | | alignment: true, +LL | | lifetimes: true, +... | +LL | | } +LL | | }> + | |__________^ required by this bound in `is_maybe_transmutable` + +error[E0277]: `should_reject_repr_rust::tuple::repr_rust` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:34:52 + | +LL | assert::is_maybe_transmutable::<repr_rust, ()>(); + | ^^ `should_reject_repr_rust::tuple::repr_rust` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<should_reject_repr_rust::tuple::repr_rust, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `()` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +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 `should_reject_repr_rust::tuple::repr_rust` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:35:47 + | +LL | assert::is_maybe_transmutable::<u128, repr_rust>(); + | ^^^^^^^^^ `u128` cannot be safely transmuted into `should_reject_repr_rust::tuple::repr_rust` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<u128, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `should_reject_repr_rust::tuple::repr_rust` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +LL | | Assume { +LL | | alignment: true, +LL | | lifetimes: true, +... | +LL | | } +LL | | }> + | |__________^ required by this bound in `is_maybe_transmutable` + +error[E0277]: `should_reject_repr_rust::braces::repr_rust` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:40:52 + | +LL | assert::is_maybe_transmutable::<repr_rust, ()>(); + | ^^ `should_reject_repr_rust::braces::repr_rust` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<should_reject_repr_rust::braces::repr_rust, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `()` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +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 `should_reject_repr_rust::braces::repr_rust` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:41:47 + | +LL | assert::is_maybe_transmutable::<u128, repr_rust>(); + | ^^^^^^^^^ `u128` cannot be safely transmuted into `should_reject_repr_rust::braces::repr_rust` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<u128, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `should_reject_repr_rust::braces::repr_rust` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +LL | | Assume { +LL | | alignment: true, +LL | | lifetimes: true, +... | +LL | | } +LL | | }> + | |__________^ required by this bound in `is_maybe_transmutable` + +error[E0277]: `aligned::repr_rust` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:46:52 + | +LL | assert::is_maybe_transmutable::<repr_rust, ()>(); + | ^^ `aligned::repr_rust` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<aligned::repr_rust, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `()` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +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 `aligned::repr_rust` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:47:47 + | +LL | assert::is_maybe_transmutable::<u128, repr_rust>(); + | ^^^^^^^^^ `u128` cannot be safely transmuted into `aligned::repr_rust` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<u128, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `aligned::repr_rust` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +LL | | Assume { +LL | | alignment: true, +LL | | lifetimes: true, +... | +LL | | } +LL | | }> + | |__________^ required by this bound in `is_maybe_transmutable` + +error[E0277]: `packed::repr_rust` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:52:52 + | +LL | assert::is_maybe_transmutable::<repr_rust, ()>(); + | ^^ `packed::repr_rust` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<packed::repr_rust, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `()` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +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 `packed::repr_rust` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:53:47 + | +LL | assert::is_maybe_transmutable::<u128, repr_rust>(); + | ^^^^^^^^^ `u128` cannot be safely transmuted into `packed::repr_rust` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<u128, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `packed::repr_rust` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +LL | | Assume { +LL | | alignment: true, +LL | | lifetimes: true, +... | +LL | | } +LL | | }> + | |__________^ required by this bound in `is_maybe_transmutable` + +error[E0277]: `nested::repr_c` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:59:49 + | +LL | assert::is_maybe_transmutable::<repr_c, ()>(); + | ^^ `nested::repr_c` cannot be safely transmuted into `()` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<nested::repr_c, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `()` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +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 `nested::repr_c` in the defining scope of `assert::Context`. + --> $DIR/should_require_well_defined_layout.rs:60:47 + | +LL | assert::is_maybe_transmutable::<u128, repr_c>(); + | ^^^^^^ `u128` cannot be safely transmuted into `nested::repr_c` in the defining scope of `assert::Context`. + | + = help: the trait `BikeshedIntrinsicFrom<u128, assert::Context, Assume { alignment: true, lifetimes: true, safety: true, validity: true }>` is not implemented for `nested::repr_c` +note: required by a bound in `is_maybe_transmutable` + --> $DIR/should_require_well_defined_layout.rs:13:14 + | +LL | pub fn is_maybe_transmutable<Src, Dst>() + | --------------------- required by a bound in this +LL | where +LL | Dst: BikeshedIntrinsicFrom<Src, Context, { + | ______________^ +LL | | Assume { +LL | | alignment: true, +LL | | lifetimes: true, +... | +LL | | } +LL | | }> + | |__________^ required by this bound in `is_maybe_transmutable` + +error: aborting due to 12 previous errors + +For more information about this error, try `rustc --explain E0277`. diff --git a/tests/ui/transmutability/structs/should_order_fields_correctly.rs b/tests/ui/transmutability/structs/should_order_fields_correctly.rs new file mode 100644 index 000000000..28724562b --- /dev/null +++ b/tests/ui/transmutability/structs/should_order_fields_correctly.rs @@ -0,0 +1,36 @@ +// check-pass +//! The fields of a struct should be laid out in lexical order. + +#![crate_type = "lib"] +#![feature(transmutability)] +#![allow(dead_code)] + +mod assert { + use std::mem::{Assume, BikeshedIntrinsicFrom}; + pub struct Context; + + pub fn is_transmutable<Src, Dst>() + where + Dst: BikeshedIntrinsicFrom<Src, Context, { + Assume::ALIGNMENT + .and(Assume::LIFETIMES) + .and(Assume::SAFETY) + .and(Assume::VALIDITY) + }> + {} +} + +#[repr(u8)] enum V0 { V = 0 } +#[repr(u8)] enum V1 { V = 1 } +#[repr(u8)] enum V2 { V = 2 } + +#[repr(C)] struct S01(V0, V1); +#[repr(C)] struct S012(V0, V1, V2); + +fn should_order_tag_and_fields_correctly() { + // An implementation that (incorrectly) arranges S01 as [0x01, 0x00] will, + // in principle, reject this transmutation. + assert::is_transmutable::<S01, V0>(); + // Again, but with one more field. + assert::is_transmutable::<S012, S01>(); +} |