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License: Apache License 2.0
Commons library for Rust
License: Apache License 2.0
It looks like the is-macro crate was moved into this repository from https://github.com/kdy1/is-macro.
There are some problems with the versions that have recently been published to crates.io:
The current approach of turning a pointer into a NonZeroU64
is not unsound, however it prevents some miri analysis of pointer bugs.
See https://doc.rust-lang.org/std/ptr/fn.from_exposed_addr.html for more information.
I believe that the NonZeroU64
could be turned into a *const c_void
, however provenance-aware pointer manipulation is still a bit tricky.
The map_addr
and with_addr
functions could be vendored into the project temporarily while the APIs stabilize, however.
Happy to contribute a PR or review, as well as adding some pointers for introducing miri in CI.
/// Creates a new pointer with the given address.
///
/// This performs the same operation as an `addr as ptr` cast, but copies
/// the *address-space* and *provenance* of `self` to the new pointer.
/// This allows us to dynamically preserve and propagate this important
/// information in a way that is otherwise impossible with a unary cast.
///
/// This is equivalent to using [`wrapping_offset`][pointer::wrapping_offset] to offset
/// `self` to the given address, and therefore has all the same capabilities and restrictions.
///
/// This API and its claimed semantics are part of the Strict Provenance experiment,
/// see the [module documentation][crate::ptr] for details.
#[must_use]
#[inline]
#[unstable(feature = "strict_provenance", issue = "95228")]
pub fn with_addr(self, addr: usize) -> Self {
// FIXME(strict_provenance_magic): I am magic and should be a compiler intrinsic.
//
// In the mean-time, this operation is defined to be "as if" it was
// a wrapping_offset, so we can emulate it as such. This should properly
// restore pointer provenance even under today's compiler.
let self_addr = self.addr() as isize;
let dest_addr = addr as isize;
let offset = dest_addr.wrapping_sub(self_addr);
// This is the canonical desugaring of this operation
self.wrapping_byte_offset(offset)
}
/// Creates a new pointer by mapping `self`'s address to a new one.
///
/// This is a convenience for [`with_addr`][pointer::with_addr], see that method for details.
///
/// This API and its claimed semantics are part of the Strict Provenance experiment,
/// see the [module documentation][crate::ptr] for details.
#[must_use]
#[inline]
#[unstable(feature = "strict_provenance", issue = "95228")]
pub fn map_addr(self, f: impl FnOnce(usize) -> usize) -> Self {
self.with_addr(f(self.addr()))
}
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