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gh-111178: Skip undefined behavior checks in _PyPegen_lookahead() (#131714)

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For example, expression_rule() return type is 'expr_ty', whereas
_PyPegen_lookahead() uses 'void*'.
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Victor Stinner 2025-03-27 10:03:58 +01:00 • committed by GitHub
parent 9ef9d687ff
commit 3796884528
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1 changed files with 5 additions and 2 deletions
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7
Parser/pegen.c
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@ -406,11 +406,14 @@ _PyPegen_lookahead_with_int(int positive, Token *(func)(Parser *, int), Parser *
return (res != NULL) == positive;
}
int
// gh-111178: Use _Py_NO_SANITIZE_UNDEFINED to disable sanitizer checks on
// undefined behavior (UBsan) in this function, rather than changing 'func'
// callback API.
int _Py_NO_SANITIZE_UNDEFINED
_PyPegen_lookahead(int positive, void *(func)(Parser *), Parser *p)
{
int mark = p->mark;
void *res = (void*)func(p);
void *res = func(p);
p->mark = mark;
return (res != NULL) == positive;
}