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Ensure miri only uses fallback bodies that have manually been vetted to preserve all UB that the native intrinsic would have

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This commit is contained in:
Oli Scherer 2024-04-23 13:32:30 +00:00
parent 351658ae66
commit 821d23b329
8 changed files with 44 additions and 2 deletions
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3
compiler/rustc_const_eval/src/const_eval/machine.rs
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@ -468,7 +468,8 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
// CTFE-specific intrinsics.
let Some(ret) = target else {
// Handle diverging intrinsics.
// Handle diverging intrinsics. We can't handle any of them (that are not already
// handled above), but check if there is a fallback body.
if ecx.tcx.intrinsic(instance.def_id()).unwrap().must_be_overridden {
throw_unsup_format!(
"intrinsic `{intrinsic_name}` is not supported at compile-time"