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miri native_calls: ensure we actually expose *mutable* provenance to the memory FFI can access

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This commit is contained in:
Ralf Jung 2025-03-11 14:32:03 +01:00
parent 705421b522
commit 3846f94230
4 changed files with 12 additions and 3 deletions
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4
compiler/rustc_const_eval/src/interpret/memory.rs
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@ -982,6 +982,10 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
todo.push(id);
}
}
// Also expose the provenance of the interpreter-level allocation, so it can
// be read by FFI. The `black_box` is defensive programming as LLVM likes
// to (incorrectly) optimize away ptr2int casts whose result is unused.
std::hint::black_box(alloc.get_bytes_unchecked_raw().expose_provenance());
// Prepare for possible write from native code if mutable.
if info.mutbl.is_mut() {