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perf: drop the initial stack copy (#2670)
authorBatuhan Taskaya <isidentical@gmail.com>
Sun, 5 Dec 2021 21:03:48 +0000 (00:03 +0300)
committerGitHub <noreply@github.com>
Sun, 5 Dec 2021 21:03:48 +0000 (13:03 -0800)
Co-authored-by: Richard Si <63936253+ichard26@users.noreply.github.com>
CHANGES.md patch | blob | history
src/blib2to3/pgen2/parse.py patch | blob | history

diff --git a/CHANGES.md b/CHANGES.md
index 097725ec0beebcda2c7cf3ac2cd89449f3c57d61..434f80980a5e88dd6bcc6cdec8769ece38107c80 100644 (file)
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -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
 
diff --git a/src/blib2to3/pgen2/parse.py b/src/blib2to3/pgen2/parse.py
index 792e8e66698246f578fef7ce88d7bf69258af3e9..e5dad3ae76697124627e40c6601f0ef0bec97e5a 100644 (file)
--- a/src/blib2to3/pgen2/parse.py
+++ b/src/blib2to3/pgen2/parse.py
@@ -53,7 +53,7 @@ class Recorder:
         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
vim configuration

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