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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 std::sync::RwLock;
use crate::stable_mir;
pub use rustc_span::def_id::{CrateNum, DefId};
static DEF_ID_MAP: RwLock<Vec<DefId>> = RwLock::new(Vec::new());
pub fn item_def_id(item: &stable_mir::CrateItem) -> DefId {
DEF_ID_MAP.read().unwrap()[item.0]
}
pub fn crate_item(did: DefId) -> stable_mir::CrateItem {
// FIXME: this becomes inefficient when we have too many ids
let mut map = DEF_ID_MAP.write().unwrap();
for (i, &d) in map.iter().enumerate() {
if d == did {
return stable_mir::CrateItem(i);
}
}
let id = map.len();
map.push(did);
stable_mir::CrateItem(id)
}
pub fn crate_num(item: &stable_mir::Crate) -> CrateNum {
item.id.into()
}
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