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Let Miri see the AllocId for all TyCtxt allocations #117956

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Merged
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Nov 16, 2023
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Let Miri see the AllocId for all TyCtxt allocations #117956

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7 changes: 7 additions & 0 deletions compiler/rustc_middle/src/mir/interpret/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -525,6 +525,13 @@ impl<'tcx> TyCtxt<'tcx> {
self.alloc_map.lock().reserve()
}

/// Miri's provenance GC needs to see all live allocations. The interpreter manages most
/// allocations but some are managed by [`TyCtxt`] and without this method the interpreter
/// doesn't know their [`AllocId`]s are in use.
pub fn iter_allocs<F: FnMut(AllocId)>(self, func: F) {
self.alloc_map.lock().alloc_map.keys().copied().for_each(func)
}

/// Reserves a new ID *if* this allocation has not been dedup-reserved before.
/// Should only be used for "symbolic" allocations (function pointers, vtables, statics), we
/// don't want to dedup IDs for "real" memory!
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