Method test_load_super_attr

Lib/test/test_opcache.py:1501–1536

Ensure that LOAD_SUPER_ATTR is specialized as expected.

(self)

    @cpython_only
    @requires_specialization
    def test_load_super_attr(self):
        """Ensure that LOAD_SUPER_ATTR is specialized as expected."""

        class A:
            def __init__(self):
                meth = super().__init__
                super().__init__()

        for _ in range(_testinternalcapi.SPECIALIZATION_THRESHOLD):
            A()

        self.assert_specialized(A.__init__, "LOAD_SUPER_ATTR_ATTR")
        self.assert_specialized(A.__init__, "LOAD_SUPER_ATTR_METHOD")
        self.assert_no_opcode(A.__init__, "LOAD_SUPER_ATTR")

        # Temporarily replace super() with something else.
        real_super = super

        def fake_super():
            def init(self):
                pass

            return init

        # Force unspecialize
        globals()['super'] = fake_super
        try:
            # Should be unspecialized after enough calls.
            for _ in range(_testinternalcapi.SPECIALIZATION_COOLDOWN):
                A()
        finally:
            globals()['super'] = real_super

        # Ensure the specialized instructions are not present
        self.assert_no_opcode(A.__init__, "LOAD_SUPER_ATTR_ATTR")
        self.assert_no_opcode(A.__init__, "LOAD_SUPER_ATTR_METHOD")

    @cpython_only
    @requires_specialization