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seek instead of opening a new file handle

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This commit is contained in:
Yoshiki Matsuda 2022-06-06 23:43:44 +09:00
parent ea0e0f4e13
commit a206121388
1 changed files with 7 additions and 4 deletions
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11
compiler/rustc_metadata/src/rmeta/encoder.rs
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@ -2254,10 +2254,10 @@ fn encode_metadata_impl(tcx: TyCtxt<'_>, path: &Path) {
let root = ecx.encode_crate_root();
ecx.opaque.flush();
let mut file = std::fs::OpenOptions::new()
.write(true)
.open(path)
.unwrap_or_else(|err| tcx.sess.fatal(&format!("failed to open the file: {}", err)));
let mut file = ecx.opaque.file();
// We will return to this position after writing the root position.
let pos_before_seek = file.stream_position().unwrap();
// Encode the root position.
let header = METADATA_HEADER.len();
@ -2267,6 +2267,9 @@ fn encode_metadata_impl(tcx: TyCtxt<'_>, path: &Path) {
file.write_all(&[(pos >> 24) as u8, (pos >> 16) as u8, (pos >> 8) as u8, (pos >> 0) as u8])
.unwrap_or_else(|err| tcx.sess.fatal(&format!("failed to write to the file: {}", err)));
// Return to the position where we are before writing the root position.
file.seek(std::io::SeekFrom::Start(pos_before_seek)).unwrap();
// Record metadata size for self-profiling
tcx.prof.artifact_size(
"crate_metadata",