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https://github.com/rust-lang/rust
synced 2024-10-21 16:03:40 +00:00
Simplify metadata decoding.
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parent
47ea2ae933
commit
c2d43e1329
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@ -35,7 +35,6 @@
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use rustc_span::{self, hygiene::MacroKind, BytePos, ExpnId, Pos, Span, SyntaxContext, DUMMY_SP};
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use proc_macro::bridge::client::ProcMacro;
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use std::cell::Cell;
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use std::io;
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use std::mem;
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use std::num::NonZeroUsize;
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@ -370,21 +369,12 @@ impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for ExpnId {
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fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Result<ExpnId, String> {
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let local_cdata = decoder.cdata();
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let sess = decoder.sess.unwrap();
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let expn_cnum = Cell::new(None);
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let get_ctxt = |cnum| {
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expn_cnum.set(Some(cnum));
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if cnum == LOCAL_CRATE {
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&local_cdata.hygiene_context
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} else {
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&local_cdata.cstore.get_crate_data(cnum).cdata.hygiene_context
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}
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};
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rustc_span::hygiene::decode_expn_id(decoder, get_ctxt, |_this, index| {
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let cnum = expn_cnum.get().unwrap();
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rustc_span::hygiene::decode_expn_id(decoder, |cnum, index| {
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// Lookup local `ExpnData`s in our own crate data. Foreign `ExpnData`s
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// are stored in the owning crate, to avoid duplication.
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let crate_data = if cnum == LOCAL_CRATE {
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debug_assert_ne!(cnum, LOCAL_CRATE);
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let crate_data = if cnum == local_cdata.cnum {
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local_cdata
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} else {
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local_cdata.cstore.get_crate_data(cnum)
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@ -401,7 +391,7 @@ fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Result<ExpnId, String> {
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.get(&crate_data, index)
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.unwrap()
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.decode((&crate_data, sess));
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Ok((expn_data, expn_hash))
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(expn_data, expn_hash)
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})
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}
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}
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@ -1136,14 +1136,12 @@ pub fn decode_expn_id_incrcomp<D: Decoder>(
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Ok(expn_id)
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}
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pub fn decode_expn_id<'a, D: Decoder>(
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pub fn decode_expn_id<D: Decoder>(
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d: &mut D,
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get_context: impl FnOnce(CrateNum) -> &'a HygieneDecodeContext,
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decode_data: impl FnOnce(&mut D, u32) -> Result<(ExpnData, ExpnHash), D::Error>,
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decode_data: impl FnOnce(CrateNum, u32) -> (ExpnData, ExpnHash),
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) -> Result<ExpnId, D::Error> {
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let index = u32::decode(d)?;
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let krate = CrateNum::decode(d)?;
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let context = get_context(krate);
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// Do this after decoding, so that we decode a `CrateNum`
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// if necessary
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@ -1152,18 +1150,14 @@ pub fn decode_expn_id<'a, D: Decoder>(
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return Ok(ExpnId::root());
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}
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let outer_expns = &context.remapped_expns;
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// Ensure that the lock() temporary is dropped early
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{
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if let Some(expn_id) = outer_expns.lock().get(index as usize).copied().flatten() {
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return Ok(expn_id);
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}
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}
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// This function is used to decode metadata, so it cannot decode information about LOCAL_CRATE.
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debug_assert_ne!(krate, LOCAL_CRATE);
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// Don't decode the data inside `HygieneData::with`, since we need to recursively decode
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// other ExpnIds
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let (mut expn_data, hash) = decode_data(d, index)?;
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let (expn_data, hash) = decode_data(krate, index);
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debug_assert_eq!(krate, expn_data.krate);
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debug_assert_eq!(expn_data.orig_id, Some(index));
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let expn_id = HygieneData::with(|hygiene_data| {
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if let Some(&expn_id) = hygiene_data.expn_hash_to_expn_id.get(&hash) {
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@ -1171,30 +1165,14 @@ pub fn decode_expn_id<'a, D: Decoder>(
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}
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let expn_id = ExpnId(hygiene_data.expn_data.len() as u32);
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// If we just deserialized an `ExpnData` owned by
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// the local crate, its `orig_id` will be stale,
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// so we need to update it to its own value.
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// This only happens when we deserialize the incremental cache,
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// since a crate will never decode its own metadata.
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if expn_data.krate == LOCAL_CRATE {
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expn_data.orig_id = Some(expn_id.0);
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}
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hygiene_data.expn_data.push(Some(expn_data));
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hygiene_data.expn_hashes.push(hash);
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let _old_id = hygiene_data.expn_hash_to_expn_id.insert(hash, expn_id);
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debug_assert!(_old_id.is_none());
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let mut expns = outer_expns.lock();
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let new_len = index as usize + 1;
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if expns.len() < new_len {
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expns.resize(new_len, None);
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}
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expns[index as usize] = Some(expn_id);
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drop(expns);
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expn_id
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});
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Ok(expn_id)
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}
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