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rmeta/query cache: don't write string values of preinterned symbols

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This commit is contained in:
klensy 2022-08-20 15:39:21 +03:00
parent 0016356f2b
commit f6329485a8
5 changed files with 51 additions and 22 deletions
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34
compiler/rustc_query_impl/src/on_disk_cache.rs
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@ -42,6 +42,7 @@ const TAG_EXPN_DATA: u8 = 1;
// Tags for encoding Symbol's
const SYMBOL_STR: u8 = 0;
const SYMBOL_OFFSET: u8 = 1;
const SYMBOL_PREINTERNED: u8 = 2;
/// Provides an interface to incremental compilation data cached from the
/// previous compilation session. This data will eventually include the results
@ -745,6 +746,10 @@ impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>> for Symbol {
sym
}
SYMBOL_PREINTERNED => {
let symbol_index = d.read_u32();
Symbol::new_from_decoded(symbol_index)
}
_ => unreachable!(),
}
}
@ -939,17 +944,24 @@ impl<'a, 'tcx> Encodable<CacheEncoder<'a, 'tcx>> for Span {
// copy&paste impl from rustc_metadata
impl<'a, 'tcx> Encodable<CacheEncoder<'a, 'tcx>> for Symbol {
fn encode(&self, s: &mut CacheEncoder<'a, 'tcx>) {
match s.symbol_table.entry(*self) {
Entry::Vacant(o) => {
s.encoder.emit_u8(SYMBOL_STR);
let pos = s.encoder.position();
o.insert(pos);
s.emit_str(self.as_str());
}
Entry::Occupied(o) => {
let x = o.get().clone();
s.emit_u8(SYMBOL_OFFSET);
s.emit_usize(x);
// if symbol preinterned, emit tag and symbol index
if self.is_preinterned() {
s.encoder.emit_u8(SYMBOL_PREINTERNED);
s.encoder.emit_u32(self.as_u32());
} else {
// otherwise write it as string or as offset to it
match s.symbol_table.entry(*self) {
Entry::Vacant(o) => {
s.encoder.emit_u8(SYMBOL_STR);
let pos = s.encoder.position();
o.insert(pos);
s.emit_str(self.as_str());
}
Entry::Occupied(o) => {
let x = o.get().clone();
s.emit_u8(SYMBOL_OFFSET);
s.emit_usize(x);
}
}
}
}