bjoernager/rust
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Specialize try_destructure_mir_constant for its sole user

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This commit is contained in:
Oli Scherer 2023-06-28 09:23:34 +00:00
parent dfe0683138
commit 4dcf988360
6 changed files with 23 additions and 18 deletions
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11
compiler/rustc_const_eval/src/const_eval/mod.rs
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@ -6,7 +6,7 @@ use crate::interpret::{
};
use rustc_middle::mir;
use rustc_middle::mir::interpret::{EvalToValTreeResult, GlobalId};
use rustc_middle::ty::{self, TyCtxt};
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_span::{source_map::DUMMY_SP, symbol::Symbol};
mod error;
@ -89,14 +89,15 @@ pub(crate) fn eval_to_valtree<'tcx>(
#[instrument(skip(tcx), level = "debug")]
pub(crate) fn try_destructure_mir_constant<'tcx>(
tcx: TyCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>,
val: mir::ConstantKind<'tcx>,
val: ConstValue<'tcx>,
ty: Ty<'tcx>,
) -> InterpResult<'tcx, mir::DestructuredConstant<'tcx>> {
let param_env = ty::ParamEnv::reveal_all();
let ecx = mk_eval_cx(tcx, DUMMY_SP, param_env, CanAccessStatics::No);
let op = ecx.eval_mir_constant(&val, None, None)?;
let op = ecx.const_val_to_op(val, ty, None)?;
// We go to `usize` as we cannot allocate anything bigger anyway.
let (field_count, variant, down) = match val.ty().kind() {
let (field_count, variant, down) = match ty.kind() {
ty::Array(_, len) => (len.eval_target_usize(tcx, param_env) as usize, None, op),
ty::Adt(def, _) if def.variants().is_empty() => {
throw_ub!(Unreachable)