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Avoid fetching the anon const hir node that is already available #133936

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merged 1 commit into from
Dec 6, 2024
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Avoid fetching the anon const hir node that is already available #133936

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26 changes: 10 additions & 16 deletions compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -29,10 +29,9 @@ use rustc_errors::codes::*;
use rustc_errors::{
Applicability, Diag, DiagCtxtHandle, ErrorGuaranteed, FatalError, struct_span_code_err,
};
use rustc_hir as hir;
use rustc_hir::def::{CtorKind, CtorOf, DefKind, Namespace, Res};
use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_hir::{GenericArg, GenericArgs, HirId};
use rustc_hir::{self as hir, AnonConst, GenericArg, GenericArgs, HirId};
use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
use rustc_infer::traits::ObligationCause;
use rustc_middle::middle::stability::AllowUnstable;
Expand Down Expand Up @@ -2089,7 +2088,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
qpath.span(),
format!("Const::lower_const_arg: invalid qpath {qpath:?}"),
),
hir::ConstArgKind::Anon(anon) => self.lower_anon_const(anon.def_id),
hir::ConstArgKind::Anon(anon) => self.lower_anon_const(anon),
hir::ConstArgKind::Infer(span) => self.ct_infer(None, span),
}
}
Expand Down Expand Up @@ -2180,27 +2179,22 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
/// Literals and const generic parameters are eagerly converted to a constant, everything else
/// becomes `Unevaluated`.
#[instrument(skip(self), level = "debug")]
fn lower_anon_const(&self, def: LocalDefId) -> Const<'tcx> {
fn lower_anon_const(&self, anon: &AnonConst) -> Const<'tcx> {
let tcx = self.tcx();

let body_id = match tcx.hir_node_by_def_id(def) {
hir::Node::AnonConst(ac) => ac.body,
node => span_bug!(
tcx.def_span(def.to_def_id()),
"from_anon_const can only process anonymous constants, not {node:?}"
),
};

let expr = &tcx.hir().body(body_id).value;
let expr = &tcx.hir().body(anon.body).value;
debug!(?expr);

let ty = tcx.type_of(def).no_bound_vars().expect("const parameter types cannot be generic");
let ty = tcx
.type_of(anon.def_id)
.no_bound_vars()
.expect("const parameter types cannot be generic");

match self.try_lower_anon_const_lit(ty, expr) {
Some(v) => v,
None => ty::Const::new_unevaluated(tcx, ty::UnevaluatedConst {
def: def.to_def_id(),
args: ty::GenericArgs::identity_for_item(tcx, def.to_def_id()),
def: anon.def_id.to_def_id(),
args: ty::GenericArgs::identity_for_item(tcx, anon.def_id.to_def_id()),
}),
}
}
Expand Down
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