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Throw error instead of panicking for unfittable bits

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This commit is contained in:
Christian Poveda 2019-10-09 10:56:47 -05:00
parent 9f24c12624
commit b8ee90d22e
1 changed files with 14 additions and 3 deletions
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17
src/helpers.rs
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@ -4,7 +4,7 @@ use rustc::hir::def_id::{DefId, CRATE_DEF_INDEX};
use rustc::mir;
use rustc::ty::{
self,
layout::{self, Align, Size, LayoutOf},
layout::{self, Align, LayoutOf, Size},
};
use rand::RngCore;
@ -328,11 +328,22 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
let allocation = this.memory_mut().get_mut(ptr.alloc_id)?;
let mut offset = Size::from_bytes(0);
for (value, size) in bits.iter().zip(sizes) {
for (&value, size) in bits.iter().zip(sizes) {
// If `value` does not fit in `size` bits, we error instead of letting
// `Scalar::from_int` panic.
let truncated = truncate(value as u128, size);
if sign_extend(truncated, size) as i128 != value {
throw_unsup_format!(
"Signed value {:#x} does not fit in {} bits",
value,
size.bits()
)
}
allocation.write_scalar(
tcx,
ptr.offset(offset, tcx)?,
Scalar::from_int(*value, size).into(),
Scalar::from_int(value, size).into(),
size,
)?;
offset += size;