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//! Normalizes MIR in RevealAll mode.
use crate::MirPass;
use rustc_middle::mir::visit::*;
use rustc_middle::mir::*;
use rustc_middle::ty::{self, Ty, TyCtxt};
pub struct RevealAll;
impl<'tcx> MirPass<'tcx> for RevealAll {
fn is_enabled(&self, sess: &rustc_session::Session) -> bool {
sess.mir_opt_level() >= 3 || super::inline::Inline.is_enabled(sess)
}
fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
// Do not apply this transformation to generators.
if body.generator.is_some() {
return;
}
let param_env = tcx.param_env_reveal_all_normalized(body.source.def_id());
RevealAllVisitor { tcx, param_env }.visit_body_preserves_cfg(body);
}
}
struct RevealAllVisitor<'tcx> {
tcx: TyCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>,
}
impl<'tcx> MutVisitor<'tcx> for RevealAllVisitor<'tcx> {
#[inline]
fn tcx(&self) -> TyCtxt<'tcx> {
self.tcx
}
#[inline]
fn visit_ty(&mut self, ty: &mut Ty<'tcx>, _: TyContext) {
// We have to use `try_normalize_erasing_regions` here, since it's
// possible that we visit impossible-to-satisfy where clauses here,
// see #91745
*ty = self.tcx.try_normalize_erasing_regions(self.param_env, *ty).unwrap_or(*ty);
}
}
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