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Avoid span_delayed_bug on one path in AdtDef::eval_explicit_discr.

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Also change its return type to `Result`.
This commit is contained in:
Nicholas Nethercote 2024-02-16 16:40:51 +11:00
parent d0267cb26b
commit b2d1d6f6ff
2 changed files with 25 additions and 14 deletions
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2
compiler/rustc_hir_analysis/src/collect.rs
View File

@ -760,7 +760,7 @@ fn convert_enum_variant_types(tcx: TyCtxt<'_>, def_id: DefId) {
let wrapped_discr = prev_discr.map_or(initial, |d| d.wrap_incr(tcx));
prev_discr = Some(
if let ty::VariantDiscr::Explicit(const_def_id) = variant.discr {
def.eval_explicit_discr(tcx, const_def_id)
def.eval_explicit_discr(tcx, const_def_id).ok()
} else if let Some(discr) = repr_type.disr_incr(tcx, prev_discr) {
Some(discr)
} else {

37
compiler/rustc_middle/src/ty/adt.rs
View File

@ -7,6 +7,7 @@ use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::intern::Interned;
use rustc_data_structures::stable_hasher::HashingControls;
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_errors::ErrorGuaranteed;
use rustc_hir as hir;
use rustc_hir::def::{CtorKind, DefKind, Res};
use rustc_hir::def_id::DefId;
@ -475,7 +476,11 @@ impl<'tcx> AdtDef<'tcx> {
}
#[inline]
pub fn eval_explicit_discr(self, tcx: TyCtxt<'tcx>, expr_did: DefId) -> Option<Discr<'tcx>> {
pub fn eval_explicit_discr(
self,
tcx: TyCtxt<'tcx>,
expr_did: DefId,
) -> Result<Discr<'tcx>, ErrorGuaranteed> {
assert!(self.is_enum());
let param_env = tcx.param_env(expr_did);
let repr_type = self.repr().discr_type();
@ -484,22 +489,24 @@ impl<'tcx> AdtDef<'tcx> {
let ty = repr_type.to_ty(tcx);
if let Some(b) = val.try_to_bits_for_ty(tcx, param_env, ty) {
trace!("discriminants: {} ({:?})", b, repr_type);
Some(Discr { val: b, ty })
Ok(Discr { val: b, ty })
} else {
info!("invalid enum discriminant: {:#?}", val);
tcx.dcx().emit_err(crate::error::ConstEvalNonIntError {
let guar = tcx.dcx().emit_err(crate::error::ConstEvalNonIntError {
span: tcx.def_span(expr_did),
});
None
Err(guar)
}
}
Err(err) => {
let msg = match err {
ErrorHandled::Reported(..) => "enum discriminant evaluation failed",
ErrorHandled::TooGeneric(..) => "enum discriminant depends on generics",
let guar = match err {
ErrorHandled::Reported(info, _) => info.into(),
ErrorHandled::TooGeneric(..) => tcx.dcx().span_delayed_bug(
tcx.def_span(expr_did),
"enum discriminant depends on generics",
),
};
tcx.dcx().span_delayed_bug(tcx.def_span(expr_did), msg);
None
Err(guar)
}
}
}
@ -516,7 +523,7 @@ impl<'tcx> AdtDef<'tcx> {
self.variants().iter_enumerated().map(move |(i, v)| {
let mut discr = prev_discr.map_or(initial, |d| d.wrap_incr(tcx));
if let VariantDiscr::Explicit(expr_did) = v.discr {
if let Some(new_discr) = self.eval_explicit_discr(tcx, expr_did) {
if let Ok(new_discr) = self.eval_explicit_discr(tcx, expr_did) {
discr = new_discr;
}
}
@ -544,9 +551,13 @@ impl<'tcx> AdtDef<'tcx> {
) -> Discr<'tcx> {
assert!(self.is_enum());
let (val, offset) = self.discriminant_def_for_variant(variant_index);
let explicit_value = val
.and_then(|expr_did| self.eval_explicit_discr(tcx, expr_did))
.unwrap_or_else(|| self.repr().discr_type().initial_discriminant(tcx));
let explicit_value = if let Some(expr_did) = val
&& let Ok(val) = self.eval_explicit_discr(tcx, expr_did)
{
val
} else {
self.repr().discr_type().initial_discriminant(tcx)
};
explicit_value.checked_add(tcx, offset as u128).0
}