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perf: drop the initial stack copy #2670

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merged 3 commits into from Dec 5, 2021
Merged

perf: drop the initial stack copy #2670

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7b89fbb
perf: drop the initial stack copy
isidentical Dec 5, 2021
247c55f
Merge branch 'main' into perf-patma-1
ichard26 Dec 5, 2021
3954153
Add changelog
ichard26 Dec 5, 2021
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2 changes: 2 additions & 0 deletions CHANGES.md
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Expand Up @@ -26,6 +26,8 @@
- Fix styling of starred expressions inside `match` subject (#2667)
- Fix parser error location on invalid syntax in a `match` statement (#2649)
- Fix Python 3.10 support on platforms without ProcessPoolExecutor (#2631)
- Improve parsing performance on code that uses `match` under `--target-version py310`
up to ~50% (#2670)

### Packaging

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2 changes: 1 addition & 1 deletion src/blib2to3/pgen2/parse.py
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Expand Up @@ -53,7 +53,7 @@ def __init__(self, parser: "Parser", ilabels: List[int], context: Context) -> No
self.context = context # not really matter

self._dead_ilabels: Set[int] = set()
self._start_point = copy.deepcopy(self.parser.stack)
self._start_point = self.parser.stack
self._points = {ilabel: copy.deepcopy(self._start_point) for ilabel in ilabels}

@property
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