syntax: Use a ring buffer instead of a dvec and save a bunch of copies. Shaves a second or two off rustc.
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cdcae39ba3
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c7c37debe4
1 changed files with 25 additions and 7 deletions
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@ -70,7 +70,9 @@ class parser {
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let mut token: token::token;
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let mut token: token::token;
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let mut span: span;
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let mut span: span;
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let mut last_span: span;
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let mut last_span: span;
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let buffer: dvec<{tok: token::token, span: span}>;
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let mut buffer: [mut {tok: token::token, span: span}]/4;
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let mut buffer_start: int;
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let mut buffer_end: int;
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let mut restriction: restriction;
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let mut restriction: restriction;
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let reader: reader;
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let reader: reader;
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let keywords: hashmap<str, ()>;
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let keywords: hashmap<str, ()>;
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@ -86,7 +88,14 @@ class parser {
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self.token = tok0.tok;
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self.token = tok0.tok;
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self.span = span0;
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self.span = span0;
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self.last_span = span0;
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self.last_span = span0;
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self.buffer = dvec::dvec();
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self.buffer = [mut
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{tok: tok0.tok, span: span0},
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{tok: tok0.tok, span: span0},
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{tok: tok0.tok, span: span0},
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{tok: tok0.tok, span: span0}
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]/4;
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self.buffer_start = 0;
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self.buffer_end = 0;
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self.restriction = UNRESTRICTED;
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self.restriction = UNRESTRICTED;
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self.reader = rdr;
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self.reader = rdr;
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self.keywords = token::keyword_table();
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self.keywords = token::keyword_table();
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@ -98,12 +107,13 @@ class parser {
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fn bump() {
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fn bump() {
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self.last_span = self.span;
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self.last_span = self.span;
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if self.buffer.len() == 0u {
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if self.buffer_start == self.buffer_end {
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let next = lexer::next_token(self.reader);
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let next = lexer::next_token(self.reader);
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self.token = next.tok;
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self.token = next.tok;
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self.span = mk_sp(next.chpos, self.reader.chpos);
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self.span = mk_sp(next.chpos, self.reader.chpos);
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} else {
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} else {
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let next = self.buffer.shift();
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let next = self.buffer[self.buffer_start];
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self.buffer_start = (self.buffer_start + 1) & 3;
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self.token = next.tok;
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self.token = next.tok;
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self.span = next.span;
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self.span = next.span;
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}
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}
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@ -112,13 +122,21 @@ class parser {
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self.token = next;
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self.token = next;
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self.span = mk_sp(lo, hi);
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self.span = mk_sp(lo, hi);
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}
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}
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fn buffer_length() -> int {
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if self.buffer_start <= self.buffer_end {
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ret self.buffer_end - self.buffer_start;
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}
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ret (4 - self.buffer_start) + self.buffer_end;
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}
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fn look_ahead(distance: uint) -> token::token {
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fn look_ahead(distance: uint) -> token::token {
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while self.buffer.len() < distance {
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let dist = distance as int;
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while self.buffer_length() < dist {
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let next = lexer::next_token(self.reader);
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let next = lexer::next_token(self.reader);
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let sp = mk_sp(next.chpos, self.reader.chpos);
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let sp = mk_sp(next.chpos, self.reader.chpos);
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self.buffer.push({tok: next.tok, span: sp});
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self.buffer[self.buffer_end] = {tok: next.tok, span: sp};
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self.buffer_end = (self.buffer_end + 1) & 3;
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}
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}
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ret self.buffer[distance - 1u].tok;
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ret copy self.buffer[(self.buffer_start + dist - 1) & 3].tok;
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}
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}
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fn fatal(m: str) -> ! {
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fn fatal(m: str) -> ! {
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self.sess.span_diagnostic.span_fatal(copy self.span, m)
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self.sess.span_diagnostic.span_fatal(copy self.span, m)
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