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[jsinterp] Add short-cut evaluation for common expression
* special handling for (d%e.length+e.length)%e.length speeds up ~6%
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@ -502,6 +502,13 @@ class JSInterpreter(object):
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expr = self._dump(inner, local_vars) + outer
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if expr.startswith('('):
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m = re.match(r'\((?P<d>[a-z])%(?P<e>[a-z])\.length\+(?P=e)\.length\)%(?P=e)\.length', expr)
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if m:
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# short-cut eval of frequently used `(d%e.length+e.length)%e.length`, worth ~6% on `pytest -k test_nsig`
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outer = None
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inner, should_abort = self._offset_e_by_d(m.group('d'), m.group('e'), local_vars)
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else:
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inner, outer = self._separate_at_paren(expr)
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inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion)
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if not outer or should_abort:
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@ -957,6 +964,17 @@ class JSInterpreter(object):
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return obj
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@staticmethod
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def _offset_e_by_d(d, e, local_vars):
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""" Short-cut eval: (d%e.length+e.length)%e.length """
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try:
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d = local_vars[d]
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e = local_vars[e]
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e = len(e)
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return _js_mod(_js_mod(d, e) + e, e), False
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except Exception:
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return None, True
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def extract_function_code(self, funcname):
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""" @returns argnames, code """
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func_m = re.search(
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