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interpret: better error when we ran out of memory #126583

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Jun 18, 2024
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interpret: better error when we ran out of memory #126583

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7 changes: 5 additions & 2 deletions compiler/rustc_middle/src/mir/interpret/allocation.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,7 @@ impl AllocBytes for Box<[u8]> {
}

fn zeroed(size: Size, _align: Align) -> Option<Self> {
let bytes = Box::<[u8]>::try_new_zeroed_slice(size.bytes_usize()).ok()?;
let bytes = Box::<[u8]>::try_new_zeroed_slice(size.bytes().try_into().ok()?).ok()?;
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In case size does not fit into a usize (which is totally possible when building for a 64bit target on a 32bit host), this avoids another ICE.

// SAFETY: the box was zero-allocated, which is a valid initial value for Box<[u8]>
let bytes = unsafe { bytes.assume_init() };
Some(bytes)
Expand Down Expand Up @@ -323,7 +323,10 @@ impl<Prov: Provenance, Bytes: AllocBytes> Allocation<Prov, (), Bytes> {
/// first call this function and then call write_scalar to fill in the right data.
pub fn uninit(size: Size, align: Align) -> Self {
match Self::uninit_inner(size, align, || {
panic!("Allocation::uninit called with panic_on_fail had allocation failure");
panic!(
"interpreter ran out of memory: cannot create allocation of {} bytes",
size.bytes()
);
}) {
Ok(x) => x,
Err(x) => x,
Expand Down