340 lines
11 KiB
Rust
340 lines
11 KiB
Rust
// Copyright 2019 The Fuchsia Authors
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//
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// Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
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// <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0>, or the MIT
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// license <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option.
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// This file may not be copied, modified, or distributed except according to
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// those terms.
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#[macro_use]
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extern crate zerocopy_renamed;
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#[path = "../include.rs"]
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mod util;
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use zerocopy_renamed::{IntoBytes, KnownLayout};
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use self::util::util::AU16;
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fn main() {}
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//
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// KnownLayout errors
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//
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struct NotKnownLayout;
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struct NotKnownLayoutDst([u8]);
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// -| `repr(C)`? | generic? | `KnownLayout`? | `Sized`? | Type Name |
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// -| N | N | N | N | KL00 |
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#[derive(KnownLayout)]
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//~[msrv, stable, nightly]^ ERROR: the size for values of type `[u8]` cannot be known at compilation time
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#[zerocopy(crate = "zerocopy_renamed")]
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struct KL00(u8, NotKnownLayoutDst);
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// -| `repr(C)`? | generic? | `KnownLayout`? | `Sized`? | Type Name |
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// -| N | N | Y | N | KL02 |
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#[derive(KnownLayout)]
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//~[msrv, stable, nightly]^ ERROR: the size for values of type `[u8]` cannot be known at compilation time
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#[zerocopy(crate = "zerocopy_renamed")]
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struct KL02(u8, [u8]);
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// -| `repr(C)`? | generic? | `KnownLayout`? | `Sized`? | Type Name |
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// -| Y | N | N | N | KL08 |
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#[derive(KnownLayout)]
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//~[msrv, stable, nightly]^ ERROR: the trait bound `NotKnownLayoutDst: zerocopy_renamed::KnownLayout` is not satisfied
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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struct KL08(u8, NotKnownLayoutDst);
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// -| `repr(C)`? | generic? | `KnownLayout`? | `Sized`? | Type Name |
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// -| Y | N | N | Y | KL09 |
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#[derive(KnownLayout)]
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//~[msrv, stable, nightly]^ ERROR: the trait bound `NotKnownLayout: zerocopy_renamed::KnownLayout` is not satisfied
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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struct KL09(NotKnownLayout, NotKnownLayout);
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//
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// Immutable errors
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//
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#[derive(Immutable)]
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//~[msrv, stable, nightly]^ ERROR: the trait bound `UnsafeCell<()>: zerocopy_renamed::Immutable` is not satisfied
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#[zerocopy(crate = "zerocopy_renamed")]
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struct Immutable1 {
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a: core::cell::UnsafeCell<()>,
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}
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#[derive(Immutable)]
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//~[msrv, stable, nightly]^ ERROR: the trait bound `UnsafeCell<u8>: zerocopy_renamed::Immutable` is not satisfied
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#[zerocopy(crate = "zerocopy_renamed")]
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struct Immutable2 {
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a: [core::cell::UnsafeCell<u8>; 0],
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}
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//
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// TryFromBytes errors
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//
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#[derive(TryFromBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(packed)]
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struct TryFromBytesPacked {
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//~[stable, nightly]^ ERROR: packed type cannot transitively contain a `#[repr(align)]` type
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foo: AU16,
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}
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#[derive(TryFromBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(packed(1))]
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struct TryFromBytesPackedN {
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//~[stable, nightly]^ ERROR: packed type cannot transitively contain a `#[repr(align)]` type
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foo: AU16,
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}
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#[derive(TryFromBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C, packed)]
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struct TryFromBytesCPacked {
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//~[stable, nightly]^ ERROR: packed type cannot transitively contain a `#[repr(align)]` type
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foo: AU16,
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}
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#[derive(TryFromBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C, packed(1))]
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struct TryFromBytesCPackedN {
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//~[stable, nightly]^ ERROR: packed type cannot transitively contain a `#[repr(align)]` type
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foo: AU16,
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}
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//
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// IntoBytes errors
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//
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// Since `IntoBytes1` has at least one generic parameter, an `IntoBytes` impl is
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// emitted in which each field type is given an `Unaligned` bound. Since `foo`'s
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// type doesn't implement `Unaligned`, this should fail.
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#[derive(IntoBytes)]
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//~[msrv, stable, nightly]^ ERROR: the trait bound `AU16: zerocopy_renamed::Unaligned` is not satisfied
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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struct IntoBytes1<T> {
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foo: AU16,
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bar: T,
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}
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#[derive(IntoBytes)]
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//~[stable, nightly]^ ERROR: `IntoBytes2` has 1 total byte(s) of padding
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//~[msrv]^^ ERROR: the trait bound `(): PaddingFree<IntoBytes2, 1_usize>` is not satisfied
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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struct IntoBytes2 {
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foo: u8,
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bar: AU16,
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}
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#[derive(IntoBytes)]
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//~[stable, nightly]^ ERROR: `IntoBytes3` has 1 total byte(s) of padding
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//~[msrv]^^ ERROR: the trait bound `(): PaddingFree<IntoBytes3, 1_usize>` is not satisfied
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C, packed(2))]
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struct IntoBytes3 {
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foo: u8,
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// We'd prefer to use AU64 here, but you can't use aligned types in
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// packed structs.
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bar: u64,
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}
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type SliceU8 = [u8];
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// Padding between `u8` and `SliceU8`. `SliceU8` doesn't syntactically look like
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// a slice, so this case is handled by our `Sized` support.
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//
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// NOTE(#1708): This exists to ensure that our error messages are good when a
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// field is unsized.
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#[derive(IntoBytes)]
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//~[stable, nightly]^ ERROR: the size for values of type `[u8]` cannot be known at compilation time
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//~[msrv]^^ ERROR: the size for values of type `[u8]` cannot be known at compilation time
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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struct IntoBytes4 {
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a: u8,
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b: SliceU8,
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//~[stable, nightly]^ ERROR: `[u8]` is unsized
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//~[msrv]^^ ERROR: the size for values of type `[u8]` cannot be known at compilation time
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}
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// Padding between `u8` and `[u16]`. `[u16]` is syntactically identifiable as a
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// slice, so this case is handled by our `repr(C)` slice DST support.
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#[derive(IntoBytes)]
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//~[msrv]^ ERROR: the trait bound `(): DynamicPaddingFree<IntoBytes5, true>` is not satisfied
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//~[stable, nightly]^^ ERROR: `IntoBytes5` has one or more padding bytes
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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struct IntoBytes5 {
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a: u8,
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b: [u16],
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}
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// Trailing padding after `[u8]`. `[u8]` is syntactically identifiable as a
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// slice, so this case is handled by our `repr(C)` slice DST support.
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#[derive(IntoBytes)]
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//~[msrv]^ ERROR: the trait bound `(): DynamicPaddingFree<IntoBytes6, true>` is not satisfied
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//~[stable, nightly]^^ ERROR: `IntoBytes6` has one or more padding bytes
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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struct IntoBytes6 {
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a: u16,
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b: [u8],
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}
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// Padding between `u8` and `u16` and also trailing padding after `[u8]`. `[u8]`
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// is syntactically identifiable as a slice, so this case is handled by our
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// `repr(C)` slice DST support.
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#[derive(IntoBytes)]
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//~[msrv]^ ERROR: the trait bound `(): DynamicPaddingFree<IntoBytes7, true>` is not satisfied
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//~[stable, nightly]^^ ERROR: `IntoBytes7` has one or more padding bytes
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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struct IntoBytes7 {
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a: u8,
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b: u16,
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c: [u8],
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}
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#[derive(IntoBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C, C)] // zerocopy-derive conservatively treats these as conflicting reprs
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//~[msrv, stable, nightly]^ ERROR: this conflicts with another representation hint
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struct IntoBytes8 {
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a: u8,
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}
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#[derive(IntoBytes)]
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//~[msrv, stable, nightly]^ ERROR: must have a non-align #[repr(...)] attribute in order to guarantee this type's memory layout
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#[zerocopy(crate = "zerocopy_renamed")]
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struct IntoBytes9<T> {
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t: T,
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}
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#[derive(IntoBytes)]
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//~[msrv, stable, nightly]^ ERROR: must have a non-align #[repr(...)] attribute in order to guarantee this type's memory layout
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(packed(2))]
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struct IntoBytes10<T> {
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t: T,
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}
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// `repr(C, packed(2))` is not equivalent to `repr(C, packed)`.
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#[derive(IntoBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C, packed(2))]
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struct IntoBytes11<T> {
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t0: T,
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// Add a second field to avoid triggering the "repr(C) struct with one
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// field" special case.
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t1: T,
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}
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fn is_into_bytes_11<T: IntoBytes>() {
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if false {
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is_into_bytes_11::<IntoBytes11<AU16>>();
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//~[stable, nightly]^ ERROR: the trait bound `AU16: zerocopy_renamed::Unaligned` is not satisfied
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}
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}
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// `repr(C, align(2))` is not sufficient to guarantee the layout of this type.
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#[derive(IntoBytes)]
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//~[msrv, stable, nightly]^ ERROR: must have a non-align #[repr(...)] attribute in order to guarantee this type's memory layout
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C, align(2))]
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struct IntoBytes12<T> {
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t: T,
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}
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// NOTE(#3063): This exists to ensure that our analysis for structs with
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// syntactic DSTs accounts for `align(N)`.
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#[derive(IntoBytes)]
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//~[msrv]^ ERROR: the trait bound `(): DynamicPaddingFree<IntoBytes13, true>` is not satisfied
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//~[stable, nightly]^^ ERROR: `IntoBytes13` has one or more padding bytes
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C, align(2))]
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struct IntoBytes13([u8]);
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//
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// Unaligned errors
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//
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#[derive(Unaligned)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C, align(2))]
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//~[msrv, stable, nightly]^ ERROR: cannot derive `Unaligned` on type with alignment greater than 1
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struct Unaligned1;
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#[derive(Unaligned)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(transparent, align(2))]
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//~[msrv, stable, nightly]^ ERROR: this conflicts with another representation hint
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//~[msrv, stable, nightly]^^ ERROR: transparent struct cannot have other repr hints
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struct Unaligned2 {
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foo: u8,
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}
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#[derive(Unaligned)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(packed, align(2))]
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//~[msrv, stable, nightly]^ ERROR: this conflicts with another representation hint
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struct Unaligned3;
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//~[stable, nightly]^ ERROR: type has conflicting packed and align representation hints
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#[derive(Unaligned)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(align(1), align(2))]
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//~[msrv, stable, nightly]^ ERROR: this conflicts with another representation hint
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struct Unaligned4;
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#[derive(Unaligned)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(align(2), align(4))]
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//~[msrv, stable, nightly]^ ERROR: this conflicts with another representation hint
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struct Unaligned5;
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#[derive(Unaligned)]
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//~[msrv, stable, nightly]^ ERROR: must have #[repr(C)], #[repr(transparent)], or #[repr(packed)] attribute in order to guarantee this type's alignment
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#[zerocopy(crate = "zerocopy_renamed")]
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struct Unaligned6;
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#[derive(Unaligned)]
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//~[msrv, stable, nightly]^ ERROR: must have #[repr(C)], #[repr(transparent)], or #[repr(packed)] attribute in order to guarantee this type's alignment
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(packed(2))]
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struct Unaligned7;
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// Test the error message emitted when conflicting reprs appear on different
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// lines. On the nightly compiler, this emits a "joint span" that spans both
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// problematic repr token trees and everything in between.
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#[derive(Copy, Clone)]
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#[repr(packed(2), C)]
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//~[nightly]^ ERROR: this conflicts with another representation hint
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#[derive(Unaligned)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C, packed(2))]
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//~[msrv, stable]^ ERROR: this conflicts with another representation hint
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struct WeirdReprSpan;
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#[derive(SplitAt)]
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//~[msrv, stable, nightly]^ ERROR: the trait bound `SplitAtNotKnownLayout: zerocopy_renamed::KnownLayout` is not satisfied
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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struct SplitAtNotKnownLayout([u8]);
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#[derive(SplitAt, KnownLayout)]
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//~[msrv]^ ERROR: type mismatch resolving `<u8 as zerocopy_renamed::KnownLayout>::PointerMetadata == usize`
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//~[msrv, stable, nightly]^^ ERROR: the trait bound `u8: SplitAt` is not satisfied
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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struct SplitAtSized(u8);
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