141 lines
3.8 KiB
Rust
141 lines
3.8 KiB
Rust
// Copyright 2023 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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// See comment in `include.rs` for why we disable the prelude.
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#![no_implicit_prelude]
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#![allow(warnings)]
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include!("include.rs");
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// A struct is `imp::TryFromBytes` if:
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// - any of its fields are `imp::TryFromBytes`
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#[derive(imp::Immutable, imp::TryFromBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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union One {
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a: u8,
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}
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util_assert_impl_all!(One: imp::TryFromBytes);
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#[test]
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fn one() {
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crate::util::test_is_bit_valid::<One, _>([42u8], true);
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crate::util::test_is_bit_valid::<One, _>([43u8], true);
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}
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#[derive(imp::Immutable, imp::TryFromBytes, imp::IntoBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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union Two {
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a: bool,
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b: bool,
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}
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util_assert_impl_all!(Two: imp::TryFromBytes);
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#[test]
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fn two() {
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crate::util::test_is_bit_valid::<Two, _>(Two { a: false }, true);
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crate::util::test_is_bit_valid::<Two, _>(Two { b: true }, true);
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crate::util::test_is_bit_valid::<Two, _>([2u8], false);
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}
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#[derive(imp::Immutable, imp::TryFromBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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union BoolAndZst {
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a: bool,
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b: (),
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}
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#[test]
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fn bool_and_zst() {
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crate::util::test_is_bit_valid::<BoolAndZst, _>([0u8], true);
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crate::util::test_is_bit_valid::<BoolAndZst, _>([1u8], true);
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crate::util::test_is_bit_valid::<BoolAndZst, _>([2u8], true);
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}
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#[derive(imp::FromBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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union MaybeFromBytes<T: imp::Copy> {
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t: T,
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}
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#[test]
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fn test_maybe_from_bytes() {
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// When deriving `FromBytes` on a type with no generic parameters, we emit a
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// trivial `is_bit_valid` impl that always returns true. This test confirms
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// that we *don't* spuriously do that when generic parameters are present.
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crate::util::test_is_bit_valid::<MaybeFromBytes<bool>, _>([2u8], false);
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}
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#[derive(imp::Immutable, imp::TryFromBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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union TypeParams<'a, T: imp::Copy, I: imp::Iterator>
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where
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I::Item: imp::Copy,
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{
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a: I::Item,
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b: u8,
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c: imp::PhantomData<&'a [u8]>,
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d: imp::PhantomData<&'static str>,
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e: imp::PhantomData<imp::String>,
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f: T,
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}
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util_assert_impl_all!(TypeParams<'static, (), imp::IntoIter<()>>: imp::TryFromBytes);
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util_assert_impl_all!(TypeParams<'static, util::AU16, imp::IntoIter<()>>: imp::TryFromBytes);
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util_assert_impl_all!(TypeParams<'static, [util::AU16; 2], imp::IntoIter<()>>: imp::TryFromBytes);
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// Deriving `imp::TryFromBytes` should work if the union has bounded parameters.
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#[derive(imp::Immutable, imp::TryFromBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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union WithParams<'a: 'b, 'b: 'a, T: 'a + 'b + imp::TryFromBytes, const N: usize>
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where
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'a: 'b,
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'b: 'a,
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T: 'a + 'b + imp::TryFromBytes + imp::Copy,
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{
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a: imp::PhantomData<&'a &'b ()>,
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b: T,
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}
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util_assert_impl_all!(WithParams<'static, 'static, u8, 42>: imp::TryFromBytes);
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#[derive(Clone, Copy, imp::TryFromBytes, imp::Immutable)]
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#[zerocopy(crate = "zerocopy_renamed")]
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struct A;
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#[derive(imp::TryFromBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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union B {
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a: A,
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}
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#[derive(imp::TryFromBytes)]
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#[zerocopy(crate = "zerocopy_renamed")]
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#[repr(C)]
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union UnsafeCellUnion {
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a: imp::ManuallyDrop<imp::UnsafeCell<bool>>,
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}
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util_assert_impl_all!(UnsafeCellUnion: imp::TryFromBytes);
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#[test]
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fn unsafe_cell_union() {
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crate::util::test_is_bit_valid::<UnsafeCellUnion, _>([0u8], true);
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crate::util::test_is_bit_valid::<UnsafeCellUnion, _>([1u8], true);
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crate::util::test_is_bit_valid::<UnsafeCellUnion, _>([2u8], false);
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}
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