rust-lang/rust
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

Use a more efficient encoding for opaque data in RBML.

Browse Source
This commit is contained in:
Michael Woerister
2015-12-25 13:59:02 -05:00
parent 89753077fc
commit fa2a7411e4
12 changed files with 1308 additions and 369 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
src/libsyntax/codemap.rs
View File

@@ -164,18 +164,15 @@ impl Eq for Span {}
impl Encodable for Span {
fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
// Encode spans as a single u64 in order to cut down on tagging overhead
// added by the RBML metadata encoding. The should be solved differently
// altogether some time (FIXME #21482)
s.emit_u64( (self.lo.0 as u64) | ((self.hi.0 as u64) << 32) )
try!(s.emit_u32(self.lo.0));
s.emit_u32(self.hi.0)
}
}
impl Decodable for Span {
fn decode<D: Decoder>(d: &mut D) -> Result<Span, D::Error> {
let lo_hi: u64 = try! { d.read_u64() };
let lo = BytePos(lo_hi as u32);
let hi = BytePos((lo_hi >> 32) as u32);
let lo = BytePos(try! { d.read_u32() });
let hi = BytePos(try! { d.read_u32() });
Ok(mk_sp(lo, hi))
}
}