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| author | Nicholas Nethercote <nnethercote@mozilla.com> | 2016-10-14 09:44:42 +1100 |
|---|---|---|
| committer | Nicholas Nethercote <nnethercote@mozilla.com> | 2016-10-14 16:38:12 +1100 |
| commit | 029dceedb9719ae5dbdbf2c033c920017e3d786e (patch) | |
| tree | 2e8d8a6503c5bf900944c64099b6f23bd199c956 /src/libsyntax/ext/tt/macro_parser.rs | |
| parent | d34318dd538bf4c9175e4138b3e4188ea8211620 (diff) | |
| download | rust-029dceedb9719ae5dbdbf2c033c920017e3d786e.tar.gz rust-029dceedb9719ae5dbdbf2c033c920017e3d786e.zip | |
Avoid many CrateConfig clones.
This commit changes `ExtCtx::cfg()` so it returns a `CrateConfig` reference instead of a clone. As a result, it also changes all of the `cfg()` callsites to explicitly clone... except one, because the commit also changes `macro_parser::parse()` to take `&CrateConfig`. This is good, because that function can be hot, and `CrateConfig` is expensive to clone. This change almost halves the number of heap allocations done by rustc for `html5ever` in rustc-benchmarks suite, which makes compilation 1.20x faster.
Diffstat (limited to 'src/libsyntax/ext/tt/macro_parser.rs')
| -rw-r--r-- | src/libsyntax/ext/tt/macro_parser.rs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ext/tt/macro_parser.rs b/src/libsyntax/ext/tt/macro_parser.rs index b0696a986e3..030cb303832 100644 --- a/src/libsyntax/ext/tt/macro_parser.rs +++ b/src/libsyntax/ext/tt/macro_parser.rs @@ -272,7 +272,7 @@ pub fn token_name_eq(t1 : &Token, t2 : &Token) -> bool { } pub fn parse(sess: &ParseSess, - cfg: ast::CrateConfig, + cfg: &ast::CrateConfig, mut rdr: TtReader, ms: &[TokenTree]) -> NamedParseResult { |