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//! Module that implements the bridge between Stable MIR and internal compiler MIR.
//!
//! For that, we define APIs that will temporarily be public to 3P that exposes rustc internal APIs
//! until stable MIR is complete.
use crate::{
rustc_smir::Tables,
stable_mir::{self, with},
};
use rustc_middle::ty::TyCtxt;
pub use rustc_span::def_id::{CrateNum, DefId};
fn with_tables<R>(mut f: impl FnMut(&mut Tables<'_>) -> R) -> R {
let mut ret = None;
with(|tables| tables.rustc_tables(&mut |t| ret = Some(f(t))));
ret.unwrap()
}
pub fn item_def_id(item: &stable_mir::CrateItem) -> DefId {
with_tables(|t| t.item_def_id(item))
}
pub fn crate_item(did: DefId) -> stable_mir::CrateItem {
with_tables(|t| t.crate_item(did))
}
impl<'tcx> Tables<'tcx> {
pub fn item_def_id(&self, item: &stable_mir::CrateItem) -> DefId {
self.def_ids[item.0]
}
pub fn crate_item(&mut self, did: DefId) -> stable_mir::CrateItem {
// FIXME: this becomes inefficient when we have too many ids
for (i, &d) in self.def_ids.iter().enumerate() {
if d == did {
return stable_mir::CrateItem(i);
}
}
let id = self.def_ids.len();
self.def_ids.push(did);
stable_mir::CrateItem(id)
}
}
pub fn crate_num(item: &stable_mir::Crate) -> CrateNum {
item.id.into()
}
pub fn run(tcx: TyCtxt<'_>, f: impl FnOnce()) {
crate::stable_mir::run(Tables { tcx, def_ids: vec![], types: vec![] }, f);
}
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