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use crate::rmeta::DecodeContext;
use crate::rmeta::EncodeContext;
use crate::rmeta::MetadataBlob;
use rustc_data_structures::owning_ref::OwningRef;
use rustc_hir::def_path_hash_map::{Config as HashMapConfig, DefPathHashMap};
use rustc_middle::parameterized_over_tcx;
use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
use rustc_span::def_id::{DefIndex, DefPathHash};
pub(crate) enum DefPathHashMapRef<'tcx> {
OwnedFromMetadata(odht::HashTable<HashMapConfig, OwningRef<MetadataBlob, [u8]>>),
BorrowedFromTcx(&'tcx DefPathHashMap),
}
parameterized_over_tcx! {
DefPathHashMapRef,
}
impl DefPathHashMapRef<'_> {
#[inline]
pub fn def_path_hash_to_def_index(&self, def_path_hash: &DefPathHash) -> DefIndex {
match *self {
DefPathHashMapRef::OwnedFromMetadata(ref map) => map.get(def_path_hash).unwrap(),
DefPathHashMapRef::BorrowedFromTcx(_) => {
panic!("DefPathHashMap::BorrowedFromTcx variant only exists for serialization")
}
}
}
}
impl<'a, 'tcx> Encodable<EncodeContext<'a, 'tcx>> for DefPathHashMapRef<'tcx> {
fn encode(&self, e: &mut EncodeContext<'a, 'tcx>) {
match *self {
DefPathHashMapRef::BorrowedFromTcx(def_path_hash_map) => {
let bytes = def_path_hash_map.raw_bytes();
e.emit_usize(bytes.len());
e.emit_raw_bytes(bytes);
}
DefPathHashMapRef::OwnedFromMetadata(_) => {
panic!("DefPathHashMap::OwnedFromMetadata variant only exists for deserialization")
}
}
}
}
impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for DefPathHashMapRef<'static> {
fn decode(d: &mut DecodeContext<'a, 'tcx>) -> DefPathHashMapRef<'static> {
// Import TyDecoder so we can access the DecodeContext::position() method
use crate::rustc_middle::ty::codec::TyDecoder;
let len = d.read_usize();
let pos = d.position();
let o = OwningRef::new(d.blob().clone()).map(|x| &x[pos..pos + len]);
// Although we already have the data we need via the OwningRef, we still need
// to advance the DecodeContext's position so it's in a valid state after
// the method. We use read_raw_bytes() for that.
let _ = d.read_raw_bytes(len);
let inner = odht::HashTable::from_raw_bytes(o).unwrap_or_else(|e| {
panic!("decode error: {}", e);
});
DefPathHashMapRef::OwnedFromMetadata(inner)
}
}
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