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Use an empty TokenCursorFrame stack when capturing tokens

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We will never need to pop  past our starting frame during token
capturing. Using an empty stack allows us to avoid pointless heap
allocations/deallocations.
This commit is contained in:
Aaron Hill 2021-01-08 18:16:20 -05:00
parent 26438b4738
commit 7b36408b5f
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1 changed files with 9 additions and 1 deletions
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10
compiler/rustc_parse/src/parser/mod.rs
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@ -1239,7 +1239,15 @@ impl<'a> Parser<'a> {
f: impl FnOnce(&mut Self) -> PResult<'a, R>,
) -> PResult<'a, (R, Option<LazyTokenStream>)> {
let start_token = (self.token.clone(), self.token_spacing);
let cursor_snapshot = self.token_cursor.clone();
let cursor_snapshot = TokenCursor {
frame: self.token_cursor.frame.clone(),
// We only ever capture tokens within our current frame,
// so we can just use an empty frame stack
stack: vec![],
desugar_doc_comments: self.token_cursor.desugar_doc_comments,
num_next_calls: self.token_cursor.num_next_calls,
append_unglued_token: self.token_cursor.append_unglued_token.clone(),
};
let ret = f(self)?;