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Add safety comment to StableAddress impl for Mmap

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bjorn3 2021-04-03 14:51:05 +02:00
parent 5773e51678
commit bda6d1f158
1 changed files with 4 additions and 0 deletions
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4
compiler/rustc_data_structures/src/memmap.rs
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@ -40,4 +40,8 @@ impl Deref for Mmap {
}
}
// SAFETY: On architectures other than WASM, mmap is used as backing storage. The address of this
// memory map is stable. On WASM, `Vec<u8>` is used as backing storage. The `Mmap` type doesn't
// export any function that can cause the `Vec` to be re-allocated. As such the address of the
// bytes inside this `Vec` is stable.
unsafe impl StableAddress for Mmap {}