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Rollup merge of #116650 - RalfJung:miri-intptrcast, r=oli-obk

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add some comments and some cleanup around Miri intptrcast

`@saethlin` maybe this helps a bit?
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Matthias Krüger 2023-10-19 14:38:26 +02:00 • committed by GitHub
commit 1d46614335
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3 changed files with 58 additions and 25 deletions
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10
compiler/rustc_const_eval/src/interpret/memory.rs
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@ -1235,6 +1235,11 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
/// Turning a "maybe pointer" into a proper pointer (and some information
/// about where it points), or an absolute address.
///
/// The result must be used immediately; it is not allowed to convert
/// the returned data back into a `Pointer` and store that in machine state.
/// (In fact that's not even possible since `M::ProvenanceExtra` is generic and
/// we don't have an operation to turn it back into `M::Provenance`.)
pub fn ptr_try_get_alloc_id(
&self,
ptr: Pointer<Option<M::Provenance>>,
@ -1253,6 +1258,11 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
}
/// Turning a "maybe pointer" into a proper pointer (and some information about where it points).
///
/// The result must be used immediately; it is not allowed to convert
/// the returned data back into a `Pointer` and store that in machine state.
/// (In fact that's not even possible since `M::ProvenanceExtra` is generic and
/// we don't have an operation to turn it back into `M::Provenance`.)
#[inline(always)]
pub fn ptr_get_alloc_id(
&self,