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save-analysis: use buffered writes

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Otherwise it ends up writing the file byte at a time, which can be very slow for large outputs.
This commit is contained in:
Jeremy Fitzhardinge 2019-06-26 17:22:39 -07:00
parent d3e2cec292
commit 768d500157
1 changed files with 4 additions and 3 deletions
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7
src/librustc_save_analysis/lib.rs
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@ -29,6 +29,7 @@ use std::cell::Cell;
use std::default::Default;
use std::env;
use std::fs::File;
use std::io::BufWriter;
use std::path::{Path, PathBuf};
use syntax::ast::{self, Attribute, DUMMY_NODE_ID, NodeId, PatKind};
@ -1025,7 +1026,7 @@ impl<'a> DumpHandler<'a> {
}
}
fn output_file(&self, ctx: &SaveContext<'_, '_>) -> (File, PathBuf) {
fn output_file(&self, ctx: &SaveContext<'_, '_>) -> (BufWriter<File>, PathBuf) {
let sess = &ctx.tcx.sess;
let file_name = match ctx.config.output_file {
Some(ref s) => PathBuf::from(s),
@ -1059,9 +1060,9 @@ impl<'a> DumpHandler<'a> {
info!("Writing output to {}", file_name.display());
let output_file = File::create(&file_name).unwrap_or_else(
let output_file = BufWriter::new(File::create(&file_name).unwrap_or_else(
|e| sess.fatal(&format!("Could not open {}: {}", file_name.display(), e)),
);
));
(output_file, file_name)
}