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Discard every parsing error in silent_emitter

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`EmitterWriter` from rustc is wasting soooo much time constructing an error
message that will never be emitted, instead we just implement our own `Emitter`
that just discards every error message.
This commit is contained in:
topecongiro 2019-03-24 17:01:09 +09:00
parent b6dac248ec
commit 037cf2c436
1 changed files with 12 additions and 10 deletions
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22
src/formatting.rs
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@ -7,7 +7,7 @@ use std::rc::Rc;
use std::time::{Duration, Instant};
use syntax::ast;
use syntax::errors::emitter::{ColorConfig, EmitterWriter};
use syntax::errors::emitter::{ColorConfig, Emitter};
use syntax::errors::{DiagnosticBuilder, Handler};
use syntax::parse::{self, ParseSess};
use syntax::source_map::{FilePathMapping, SourceMap, Span, DUMMY_SP};
@ -89,7 +89,7 @@ fn format_project<T: FormatHandler>(
timer = timer.done_parsing();
// Suppress error output if we have to do any further parsing.
let silent_emitter = silent_emitter(source_map);
let silent_emitter = silent_emitter();
parse_session.span_diagnostic = Handler::with_emitter(true, None, silent_emitter);
let mut context = FormatContext::new(&krate, report, parse_session, config, handler);
@ -670,18 +670,20 @@ fn parse_crate(
Err(ErrorKind::ParseError)
}
fn silent_emitter(source_map: Rc<SourceMap>) -> Box<EmitterWriter> {
Box::new(EmitterWriter::new(
Box::new(Vec::new()),
Some(source_map),
false,
false,
))
/// Emitter which discards every error.
struct SilentEmitter;
impl Emitter for SilentEmitter {
fn emit(&mut self, _db: &DiagnosticBuilder<'_>) {}
}
fn silent_emitter() -> Box<SilentEmitter> {
Box::new(SilentEmitter {})
}
fn make_parse_sess(source_map: Rc<SourceMap>, config: &Config) -> ParseSess {
let tty_handler = if config.hide_parse_errors() {
let silent_emitter = silent_emitter(source_map.clone());
let silent_emitter = silent_emitter();
Handler::with_emitter(true, None, silent_emitter)
} else {
let supports_color = term::stderr().map_or(false, |term| term.supports_color());