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incr.comp.: Revert hashing optimization that caused regression.

This commit is contained in:
Michael Woerister 2017-12-15 16:50:07 -06:00
parent 77efd6800c
commit c7e5b703cd
6 changed files with 24 additions and 43 deletions
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2
src/librustc/ich/hcx.rs
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@ -341,7 +341,7 @@ impl<'gcx> HashStable<StableHashingContext<'gcx>> for Span {
std_hash::Hash::hash(&TAG_VALID_SPAN, hasher);
// We truncate the stable_id hash and line and col numbers. The chances
// of causing a collision this way should be minimal.
std_hash::Hash::hash(&(file_lo.stable_id.0 as u64), hasher);
std_hash::Hash::hash(&file_lo.name, hasher);
let col = (col_lo.0 as u64) & 0xFF;
let line = ((line_lo as u64) & 0xFF_FF_FF) << 8;

2
src/librustc/ich/impls_syntax.rs
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@ -394,8 +394,6 @@ impl<'gcx> HashStable<StableHashingContext<'gcx>> for FileMap {
// Do not hash the source as it is not encoded
src: _,
src_hash,
// The stable id is just a hash of other fields
stable_id: _,
external_src: _,
start_pos,
end_pos: _,

2
src/librustc/ty/maps/on_disk_cache.rs
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@ -176,7 +176,7 @@ impl<'sess> OnDiskCache<'sess> {
let index = FileMapIndex(index as u32);
let file_ptr: *const FileMap = &**file as *const _;
file_to_file_index.insert(file_ptr, index);
file_index_to_stable_id.insert(index, file.stable_id);
file_index_to_stable_id.insert(index, StableFilemapId::new(&file));
}
(file_to_file_index, file_index_to_stable_id)

2
src/librustc_metadata/decoder.rs
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@ -1124,7 +1124,6 @@ impl<'a, 'tcx> CrateMetadata {
let syntax_pos::FileMap { name,
name_was_remapped,
src_hash,
stable_id,
start_pos,
end_pos,
lines,
@ -1156,7 +1155,6 @@ impl<'a, 'tcx> CrateMetadata {
name_was_remapped,
self.cnum.as_u32(),
src_hash,
stable_id,
source_length,
lines,
multibyte_chars,

26
src/libsyntax/codemap.rs
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@ -23,7 +23,9 @@ 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;
@ -100,6 +102,24 @@ 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
//
@ -197,7 +217,7 @@ impl CodeMap {
self.stable_id_to_filemap
.borrow_mut()
.insert(filemap.stable_id, filemap.clone());
.insert(StableFilemapId::new(&filemap), filemap.clone());
filemap
}
@ -226,7 +246,6 @@ 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>,
@ -257,7 +276,6 @@ impl CodeMap {
crate_of_origin,
src: None,
src_hash,
stable_id,
external_src: RefCell::new(ExternalSource::AbsentOk),
start_pos,
end_pos,
@ -270,7 +288,7 @@ impl CodeMap {
self.stable_id_to_filemap
.borrow_mut()
.insert(stable_id, filemap.clone());
.insert(StableFilemapId::new(&filemap), filemap.clone());
filemap
}

33
src/libsyntax_pos/lib.rs
View File

@ -678,8 +678,6 @@ pub struct FileMap {
pub src: Option<Rc<String>>,
/// The source code's hash
pub src_hash: u128,
/// The stable id used during incr. comp.
pub stable_id: StableFilemapId,
/// The external source code (used for external crates, which will have a `None`
/// value as `self.src`.
pub external_src: RefCell<ExternalSource>,
@ -695,34 +693,12 @@ pub struct FileMap {
pub non_narrow_chars: RefCell<Vec<NonNarrowChar>>,
}
// 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(pub u128);
impl StableFilemapId {
pub fn new(name: &FileName,
name_was_remapped: bool,
unmapped_path: &FileName)
-> StableFilemapId {
use std::hash::Hash;
let mut hasher = StableHasher::new();
name.hash(&mut hasher);
name_was_remapped.hash(&mut hasher);
unmapped_path.hash(&mut hasher);
StableFilemapId(hasher.finish())
}
}
impl Encodable for FileMap {
fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_struct("FileMap", 8, |s| {
s.emit_struct_field("name", 0, |s| self.name.encode(s))?;
s.emit_struct_field("name_was_remapped", 1, |s| self.name_was_remapped.encode(s))?;
s.emit_struct_field("src_hash", 2, |s| self.src_hash.encode(s))?;
s.emit_struct_field("stable_id", 3, |s| self.stable_id.encode(s))?;
s.emit_struct_field("start_pos", 4, |s| self.start_pos.encode(s))?;
s.emit_struct_field("end_pos", 5, |s| self.end_pos.encode(s))?;
s.emit_struct_field("lines", 6, |s| {
@ -790,8 +766,6 @@ impl Decodable for FileMap {
d.read_struct_field("name_was_remapped", 1, |d| Decodable::decode(d))?;
let src_hash: u128 =
d.read_struct_field("src_hash", 2, |d| Decodable::decode(d))?;
let stable_id: StableFilemapId =
d.read_struct_field("stable_id", 3, |d| Decodable::decode(d))?;
let start_pos: BytePos =
d.read_struct_field("start_pos", 4, |d| Decodable::decode(d))?;
let end_pos: BytePos = d.read_struct_field("end_pos", 5, |d| Decodable::decode(d))?;
@ -839,7 +813,6 @@ impl Decodable for FileMap {
end_pos,
src: None,
src_hash,
stable_id,
external_src: RefCell::new(ExternalSource::AbsentOk),
lines: RefCell::new(lines),
multibyte_chars: RefCell::new(multibyte_chars),
@ -866,11 +839,6 @@ impl FileMap {
let mut hasher: StableHasher<u128> = StableHasher::new();
hasher.write(src.as_bytes());
let src_hash = hasher.finish();
let stable_id = StableFilemapId::new(&name,
name_was_remapped,
&unmapped_path);
let end_pos = start_pos.to_usize() + src.len();
FileMap {
@ -880,7 +848,6 @@ impl FileMap {
crate_of_origin: 0,
src: Some(Rc::new(src)),
src_hash,
stable_id,
external_src: RefCell::new(ExternalSource::Unneeded),
start_pos,
end_pos: Pos::from_usize(end_pos),