https://github.com/python/cpython/commit/6e80f11eb5eba360334b4ace105eb7d73394baf7
commit: 6e80f11eb5eba360334b4ace105eb7d73394baf7
branch: main
author: Victor Stinner <vstin...@python.org>
committer: vstinner <vstin...@python.org>
date: 2025-06-03T08:40:45+02:00
summary:
gh-135028: Increase parser MAXSTACK for nested parenthesis (#135031)
files:
M Lib/test/test_grammar.py
M Parser/parser.c
M Tools/peg_generator/pegen/c_generator.py
diff --git a/Lib/test/test_grammar.py b/Lib/test/test_grammar.py
index c39565144bf7f4..7f5d48b9c63ab7 100644
--- a/Lib/test/test_grammar.py
+++ b/Lib/test/test_grammar.py
@@ -1,7 +1,7 @@
# Python test set -- part 1, grammar.
# This just tests whether the parser accepts them all.
-from test.support import check_syntax_error
+from test.support import check_syntax_error, skip_wasi_stack_overflow
from test.support import import_helper
import annotationlib
import inspect
@@ -249,6 +249,18 @@ def test_eof_error(self):
compile(s, "<test>", "exec")
self.assertIn("was never closed", str(cm.exception))
+ @skip_wasi_stack_overflow()
+ def test_max_level(self):
+ # Macro defined in Parser/lexer/state.h
+ MAXLEVEL = 200
+
+ result = eval("(" * MAXLEVEL + ")" * MAXLEVEL)
+ self.assertEqual(result, ())
+
+ with self.assertRaises(SyntaxError) as cm:
+ eval("(" * (MAXLEVEL + 1) + ")" * (MAXLEVEL + 1))
+ self.assertStartsWith(str(cm.exception), 'too many nested parentheses')
+
var_annot_global: int # a global annotated is necessary for test_var_annot
diff --git a/Parser/parser.c b/Parser/parser.c
index 84a293cddffde6..d5aafef826ed3a 100644
--- a/Parser/parser.c
+++ b/Parser/parser.c
@@ -14,7 +14,7 @@
# define MAXSTACK 4000
# endif
#else
-# define MAXSTACK 4000
+# define MAXSTACK 6000
#endif
static const int n_keyword_lists = 9;
static KeywordToken *reserved_keywords[] = {
diff --git a/Tools/peg_generator/pegen/c_generator.py
b/Tools/peg_generator/pegen/c_generator.py
index 2be85a163b4043..09c5651f24a3bb 100644
--- a/Tools/peg_generator/pegen/c_generator.py
+++ b/Tools/peg_generator/pegen/c_generator.py
@@ -44,7 +44,7 @@
# define MAXSTACK 4000
# endif
#else
-# define MAXSTACK 4000
+# define MAXSTACK 6000
#endif
"""
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