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gh-93671: Avoid exponential backtracking in deeply nested sequence patterns in match statements (GH-93680)

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Co-authored-by: Łukasz Langa <lukasz@langa.pl>
This commit is contained in:
Pablo Galindo Salgado 2022-06-10 16:56:45 +01:00 • committed by GitHub
parent 21a9a85ff4
commit 53a8b17895
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 36 additions and 3 deletions
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10
Parser/parser.c generated
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@ -7945,6 +7945,10 @@ closed_pattern_rule(Parser *p)
return NULL;
}
pattern_ty _res = NULL;
if (_PyPegen_is_memoized(p, closed_pattern_type, &_res)) {
p->level--;
return _res;
}
int _mark = p->mark;
{ // literal_pattern
if (p->error_indicator) {
@ -8100,6 +8104,7 @@ closed_pattern_rule(Parser *p)
}
_res = NULL;
done:
_PyPegen_insert_memo(p, _mark, closed_pattern_type, _res);
p->level--;
return _res;
}
@ -9623,6 +9628,10 @@ star_pattern_rule(Parser *p)
return NULL;
}
pattern_ty _res = NULL;
if (_PyPegen_is_memoized(p, star_pattern_type, &_res)) {
p->level--;
return _res;
}
int _mark = p->mark;
if (p->mark == p->fill && _PyPegen_fill_token(p) < 0) {
p->error_indicator = 1;
@ -9707,6 +9716,7 @@ star_pattern_rule(Parser *p)
}
_res = NULL;
done:
_PyPegen_insert_memo(p, _mark, star_pattern_type, _res);
p->level--;
return _res;
}