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Make an initial guess for metadata size to reduce buffer resizes

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This commit is contained in:
Josh Triplett 2021-10-04 19:23:13 -07:00
parent 2b6ed3b675
commit c35a700be2
1 changed files with 3 additions and 1 deletions
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4
compiler/rustc_metadata/src/locator.rs
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@ -740,7 +740,9 @@ fn get_metadata_section(
// Header is okay -> inflate the actual metadata
let compressed_bytes = &buf[header_len..];
debug!("inflating {} bytes of compressed metadata", compressed_bytes.len());
let mut inflated = Vec::new();
// Assume the decompressed data will be at least the size of the compressed data, so we
// don't have to grow the buffer as much.
let mut inflated = Vec::with_capacity(compressed_bytes.len());
match FrameDecoder::new(compressed_bytes).read_to_end(&mut inflated) {
Ok(_) => rustc_erase_owner!(OwningRef::new(inflated).map_owner_box()),
Err(_) => {