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Auto merge of #37318 - nnethercote:html5ever-more, r=nrc,eddyb

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Avoid some allocations in the macro parser

These three commits reduce the number of heap allocations done when compiling rustc-benchmarks/html5ever-2016-08-25 by 20%, from 16.5M to 13.3M. This speeds up (debug) compilation of it with a stage1 compiler by about 7%.
This commit is contained in:
bors 2016-10-22 13:09:24 -07:00 • committed by GitHub
commit a117bba125
3 changed files with 32 additions and 16 deletions
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8
src/test/run-pass-fulldeps/auxiliary/procedural_mbe_matching.rs
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@ -25,6 +25,7 @@ use syntax::ext::base::{ExtCtxt, MacResult, DummyResult, MacEager};
use syntax::ext::build::AstBuilder;
use syntax::ext::tt::macro_parser::{MatchedSeq, MatchedNonterminal};
use syntax::ext::tt::macro_parser::{Success, Failure, Error};
use syntax::ext::tt::macro_parser::parse_failure_msg;
use syntax::ptr::P;
use syntax_pos::Span;
use rustc_plugin::Registry;
@ -58,8 +59,11 @@ fn expand_mbe_matches(cx: &mut ExtCtxt, sp: Span, args: &[TokenTree])
_ => unreachable!()
}
}
Failure(_, s) | Error(_, s) => {
panic!("expected Success, but got Error/Failure: {}", s);
Failure(_, tok) => {
panic!("expected Success, but got Failure: {}", parse_failure_msg(tok));
}
Error(_, s) => {
panic!("expected Success, but got Error: {}", s);
}
};