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WIP PROOF-OF-CONCEPT: Make the compiler complain about all int<->ptr casts.

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This commit is contained in:
Aria Beingessner 2022-03-21 19:25:44 -04:00 • committed by niluxv
parent e4f5b15b88
commit 1040cab53b
2 changed files with 96 additions and 4 deletions
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36
compiler/rustc_lint_defs/src/builtin.rs
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@ -2648,6 +2648,41 @@ declare_lint! {
};
}
declare_lint! {
/// The `fuzzy_provenance_casts` lint detects an `as` cast between an integer
/// and a pointer.
///
/// ### Example
///
/// fn main() {
/// let my_ref = &0;
/// let my_addr = my_ref as usize;
/// }
/// ```
///
/// {{produces}}
///
/// ### Explanation
///
/// Casting a pointer to an integer or an integer to a pointer is a lossy operation,
/// because beyond just an *address* a pointer may be associated with a particular
/// *provenance* and *segment*. This information is required by both the compiler
/// and the hardware to correctly execute your code. If you need to do this kind
/// of operation, use ptr::addr and ptr::with_addr.
///
/// This is a [future-incompatible] lint to transition this to a hard error
/// in the future. See [issue #9999999] for more details.
///
/// [future-incompatible]: ../index.md#future-incompatible-lints
/// [issue #9999999]: https://github.com/rust-lang/rust/issues/9999999
pub FUZZY_PROVENANCE_CASTS,
Warn,
"A lossy pointer-integer integer cast is used",
@future_incompatible = FutureIncompatibleInfo {
reference: "issue #9999999 <https://github.com/rust-lang/rust/issues/9999999>",
};
}
declare_lint! {
/// The `const_evaluatable_unchecked` lint detects a generic constant used
/// in a type.
@ -3101,6 +3136,7 @@ declare_lint_pass! {
UNSAFE_OP_IN_UNSAFE_FN,
INCOMPLETE_INCLUDE,
CENUM_IMPL_DROP_CAST,
FUZZY_PROVENANCE_CASTS,
CONST_EVALUATABLE_UNCHECKED,
INEFFECTIVE_UNSTABLE_TRAIT_IMPL,
MUST_NOT_SUSPEND,