bjoernager/rust
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check if const is ADT or not

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This commit is contained in:
Takayuki Maeda 2022-10-03 17:51:18 +09:00
parent b8b30ae6ba
commit 0e615caa8d
7 changed files with 77 additions and 16 deletions
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15
compiler/rustc_transmute/src/lib.rs
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@ -115,7 +115,7 @@ mod rustc {
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
c: Const<'tcx>,
) -> Self {
) -> Option<Self> {
use rustc_middle::ty::ScalarInt;
use rustc_middle::ty::TypeVisitable;
use rustc_span::symbol::sym;
@ -123,10 +123,15 @@ mod rustc {
let c = c.eval(tcx, param_env);
if let Some(err) = c.error_reported() {
return Self { alignment: true, lifetimes: true, safety: true, validity: true };
return Some(Self {
alignment: true,
lifetimes: true,
safety: true,
validity: true,
});
}
let adt_def = c.ty().ty_adt_def().expect("The given `Const` must be an ADT.");
let adt_def = c.ty().ty_adt_def()?;
assert_eq!(
tcx.require_lang_item(LangItem::TransmuteOpts, None),
@ -148,12 +153,12 @@ mod rustc {
fields[field_idx].unwrap_leaf() == ScalarInt::TRUE
};
Self {
Some(Self {
alignment: get_field(sym::alignment),
lifetimes: get_field(sym::lifetimes),
safety: get_field(sym::safety),
validity: get_field(sym::validity),
}
})
}
}
}