bjoernager/rust
bjoernager/rust
1
Fork 0
Code Issues Pull requests Activity

Keep an unoptimized duplicate of const fn around

Browse source 
This allows CTFE to reliably detect UB, as otherwise
optimizations may hide UB.
This commit is contained in:
oli 2020-10-26 19:00:40 +00:00 • committed by oli
parent 8e4fe6647f
commit cccd40f9b5
25 changed files with 312 additions and 112 deletions
Download patch file Download diff file Expand all files Collapse all files

5
compiler/rustc_mir/src/monomorphize/polymorphize.rs
View file

@ -69,7 +69,10 @@ fn unused_generic_params(tcx: TyCtxt<'_>, def_id: DefId) -> FiniteBitSet<u32> {
debug!("unused_generic_params: (after default) unused_parameters={:?}", unused_parameters);
// Visit MIR and accumululate used generic parameters.
let body = tcx.optimized_mir(def_id);
let body = match tcx.hir().body_const_context(def_id.expect_local()) {
None => tcx.optimized_mir(def_id),
Some(_) => tcx.mir_for_ctfe(def_id),
};
let mut vis = MarkUsedGenericParams { tcx, def_id, unused_parameters: &mut unused_parameters };
vis.visit_body(body);
debug!("unused_generic_params: (after visitor) unused_parameters={:?}", unused_parameters);