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rustc: buffer the output writer for -Z ast-json[-noexpand].

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This takes the time for `rustc libstd/lib.rs -Z ast-json-noexpand >
file.json` from 9.0s to 3.5s (~0.5s spent parsing etc.) and `-Z
ast-json` from 11s to 5s (~1.5s spent parsing and expanding).
This commit is contained in:
Huon Wilson 2014-03-18 23:40:07 +11:00 committed by Alex Crichton
parent 873f7408bd
commit 92f0bc2935
1 changed files with 2 additions and 2 deletions
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4
src/librustc/driver/driver.rs
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@ -186,7 +186,7 @@ pub fn phase_1_parse_input(sess: &Session, cfg: ast::CrateConfig, input: &Input)
});
if sess.opts.debugging_opts & session::AST_JSON_NOEXPAND != 0 {
let mut stdout = io::stdout();
let mut stdout = io::BufferedWriter::new(io::stdout());
let mut json = json::PrettyEncoder::new(&mut stdout);
krate.encode(&mut json);
}
@ -261,7 +261,7 @@ pub fn phase_2_configure_and_expand(sess: &Session,
front::assign_node_ids_and_map::assign_node_ids_and_map(sess, krate));
if sess.opts.debugging_opts & session::AST_JSON != 0 {
let mut stdout = io::stdout();
let mut stdout = io::BufferedWriter::new(io::stdout());
let mut json = json::PrettyEncoder::new(&mut stdout);
krate.encode(&mut json);
}