bjoernager/rust
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incr.comp.: Do less hashing per Span.

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This commit is contained in:
Michael Woerister 2017-12-08 17:07:48 +01:00
parent 9faa31612f
commit 0b4c2cccac
6 changed files with 62 additions and 41 deletions
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26
src/libsyntax/codemap.rs
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@ -23,9 +23,7 @@ pub use syntax_pos::hygiene::{ExpnFormat, ExpnInfo, NameAndSpan};
pub use self::ExpnFormat::*;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::stable_hasher::StableHasher;
use std::cell::{RefCell, Ref};
use std::hash::Hash;
use std::path::{Path, PathBuf};
use std::rc::Rc;
@ -102,24 +100,6 @@ impl FileLoader for RealFileLoader {
}
}
// This is a FileMap identifier that is used to correlate FileMaps between
// subsequent compilation sessions (which is something we need to do during
// incremental compilation).
#[derive(Copy, Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Debug)]
pub struct StableFilemapId(u128);
impl StableFilemapId {
pub fn new(filemap: &FileMap) -> StableFilemapId {
let mut hasher = StableHasher::new();
filemap.name.hash(&mut hasher);
filemap.name_was_remapped.hash(&mut hasher);
filemap.unmapped_path.hash(&mut hasher);
StableFilemapId(hasher.finish())
}
}
// _____________________________________________________________________________
// CodeMap
//
@ -217,7 +197,7 @@ impl CodeMap {
self.stable_id_to_filemap
.borrow_mut()
.insert(StableFilemapId::new(&filemap), filemap.clone());
.insert(filemap.stable_id, filemap.clone());
filemap
}
@ -246,6 +226,7 @@ impl CodeMap {
name_was_remapped: bool,
crate_of_origin: u32,
src_hash: u128,
stable_id: StableFilemapId,
source_len: usize,
mut file_local_lines: Vec<BytePos>,
mut file_local_multibyte_chars: Vec<MultiByteChar>,
@ -276,6 +257,7 @@ impl CodeMap {
crate_of_origin,
src: None,
src_hash,
stable_id,
external_src: RefCell::new(ExternalSource::AbsentOk),
start_pos,
end_pos,
@ -288,7 +270,7 @@ impl CodeMap {
self.stable_id_to_filemap
.borrow_mut()
.insert(StableFilemapId::new(&filemap), filemap.clone());
.insert(stable_id, filemap.clone());
filemap
}