460 lines
16 KiB
Python
460 lines
16 KiB
Python
import pytest
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import re
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from pybind11_tests import factory_constructors as m
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from pybind11_tests.factory_constructors import tag
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from pybind11_tests import ConstructorStats
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def test_init_factory_basic():
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"""Tests py::init_factory() wrapper around various ways of returning the object"""
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cstats = [ConstructorStats.get(c) for c in [m.TestFactory1, m.TestFactory2, m.TestFactory3]]
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cstats[0].alive() # force gc
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n_inst = ConstructorStats.detail_reg_inst()
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x1 = m.TestFactory1(tag.unique_ptr, 3)
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assert x1.value == "3"
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y1 = m.TestFactory1(tag.pointer)
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assert y1.value == "(empty)"
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z1 = m.TestFactory1("hi!")
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assert z1.value == "hi!"
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assert ConstructorStats.detail_reg_inst() == n_inst + 3
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x2 = m.TestFactory2(tag.move)
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assert x2.value == "(empty2)"
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y2 = m.TestFactory2(tag.pointer, 7)
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assert y2.value == "7"
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z2 = m.TestFactory2(tag.unique_ptr, "hi again")
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assert z2.value == "hi again"
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assert ConstructorStats.detail_reg_inst() == n_inst + 6
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x3 = m.TestFactory3(tag.shared_ptr)
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assert x3.value == "(empty3)"
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y3 = m.TestFactory3(tag.pointer, 42)
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assert y3.value == "42"
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z3 = m.TestFactory3("bye")
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assert z3.value == "bye"
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with pytest.raises(TypeError) as excinfo:
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m.TestFactory3(tag.null_ptr)
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assert str(excinfo.value) == "pybind11::init(): factory function returned nullptr"
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assert [i.alive() for i in cstats] == [3, 3, 3]
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assert ConstructorStats.detail_reg_inst() == n_inst + 9
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del x1, y2, y3, z3
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assert [i.alive() for i in cstats] == [2, 2, 1]
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assert ConstructorStats.detail_reg_inst() == n_inst + 5
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del x2, x3, y1, z1, z2
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assert [i.alive() for i in cstats] == [0, 0, 0]
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assert ConstructorStats.detail_reg_inst() == n_inst
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assert [i.values() for i in cstats] == [
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["3", "hi!"],
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["7", "hi again"],
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["42", "bye"]
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]
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assert [i.default_constructions for i in cstats] == [1, 1, 1]
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def test_init_factory_signature(msg):
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with pytest.raises(TypeError) as excinfo:
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m.TestFactory1("invalid", "constructor", "arguments")
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assert msg(excinfo.value) == """
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__init__(): incompatible constructor arguments. The following argument types are supported:
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1. m.factory_constructors.TestFactory1(arg0: m.factory_constructors.tag.unique_ptr_tag, arg1: int)
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2. m.factory_constructors.TestFactory1(arg0: str)
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3. m.factory_constructors.TestFactory1(arg0: m.factory_constructors.tag.pointer_tag)
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4. m.factory_constructors.TestFactory1(arg0: handle, arg1: int, arg2: handle)
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Invoked with: 'invalid', 'constructor', 'arguments'
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""" # noqa: E501 line too long
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assert msg(m.TestFactory1.__init__.__doc__) == """
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__init__(*args, **kwargs)
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Overloaded function.
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1. __init__(self: m.factory_constructors.TestFactory1, arg0: m.factory_constructors.tag.unique_ptr_tag, arg1: int) -> None
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2. __init__(self: m.factory_constructors.TestFactory1, arg0: str) -> None
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3. __init__(self: m.factory_constructors.TestFactory1, arg0: m.factory_constructors.tag.pointer_tag) -> None
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4. __init__(self: m.factory_constructors.TestFactory1, arg0: handle, arg1: int, arg2: handle) -> None
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""" # noqa: E501 line too long
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def test_init_factory_casting():
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"""Tests py::init_factory() wrapper with various upcasting and downcasting returns"""
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cstats = [ConstructorStats.get(c) for c in [m.TestFactory3, m.TestFactory4, m.TestFactory5]]
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cstats[0].alive() # force gc
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n_inst = ConstructorStats.detail_reg_inst()
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# Construction from derived references:
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a = m.TestFactory3(tag.pointer, tag.TF4, 4)
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assert a.value == "4"
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b = m.TestFactory3(tag.shared_ptr, tag.TF4, 5)
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assert b.value == "5"
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c = m.TestFactory3(tag.pointer, tag.TF5, 6)
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assert c.value == "6"
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d = m.TestFactory3(tag.shared_ptr, tag.TF5, 7)
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assert d.value == "7"
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assert ConstructorStats.detail_reg_inst() == n_inst + 4
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# Shared a lambda with TF3:
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e = m.TestFactory4(tag.pointer, tag.TF4, 8)
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assert e.value == "8"
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assert ConstructorStats.detail_reg_inst() == n_inst + 5
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assert [i.alive() for i in cstats] == [5, 3, 2]
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del a
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assert [i.alive() for i in cstats] == [4, 2, 2]
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assert ConstructorStats.detail_reg_inst() == n_inst + 4
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del b, c, e
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assert [i.alive() for i in cstats] == [1, 0, 1]
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assert ConstructorStats.detail_reg_inst() == n_inst + 1
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del d
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assert [i.alive() for i in cstats] == [0, 0, 0]
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assert ConstructorStats.detail_reg_inst() == n_inst
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assert [i.values() for i in cstats] == [
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["4", "5", "6", "7", "8"],
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["4", "5", "8"],
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["6", "7"]
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]
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def test_init_factory_alias():
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"""Tests py::init_factory() wrapper with value conversions and alias types"""
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cstats = [m.TestFactory6.get_cstats(), m.TestFactory6.get_alias_cstats()]
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cstats[0].alive() # force gc
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n_inst = ConstructorStats.detail_reg_inst()
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a = m.TestFactory6(tag.base, 1)
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assert a.get() == 1
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assert not a.has_alias()
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b = m.TestFactory6(tag.alias, "hi there")
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assert b.get() == 8
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assert b.has_alias()
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c = m.TestFactory6(tag.alias, 3)
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assert c.get() == 3
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assert c.has_alias()
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d = m.TestFactory6(tag.alias, tag.pointer, 4)
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assert d.get() == 4
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assert d.has_alias()
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e = m.TestFactory6(tag.base, tag.pointer, 5)
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assert e.get() == 5
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assert not e.has_alias()
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f = m.TestFactory6(tag.base, tag.alias, tag.pointer, 6)
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assert f.get() == 6
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assert f.has_alias()
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assert ConstructorStats.detail_reg_inst() == n_inst + 6
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assert [i.alive() for i in cstats] == [6, 4]
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del a, b, e
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assert [i.alive() for i in cstats] == [3, 3]
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assert ConstructorStats.detail_reg_inst() == n_inst + 3
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del f, c, d
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assert [i.alive() for i in cstats] == [0, 0]
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assert ConstructorStats.detail_reg_inst() == n_inst
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class MyTest(m.TestFactory6):
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def __init__(self, *args):
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m.TestFactory6.__init__(self, *args)
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def get(self):
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return -5 + m.TestFactory6.get(self)
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# Return Class by value, moved into new alias:
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z = MyTest(tag.base, 123)
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assert z.get() == 118
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assert z.has_alias()
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# Return alias by value, moved into new alias:
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y = MyTest(tag.alias, "why hello!")
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assert y.get() == 5
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assert y.has_alias()
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# Return Class by pointer, moved into new alias then original destroyed:
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x = MyTest(tag.base, tag.pointer, 47)
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assert x.get() == 42
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assert x.has_alias()
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assert ConstructorStats.detail_reg_inst() == n_inst + 3
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assert [i.alive() for i in cstats] == [3, 3]
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del x, y, z
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assert [i.alive() for i in cstats] == [0, 0]
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assert ConstructorStats.detail_reg_inst() == n_inst
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assert [i.values() for i in cstats] == [
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["1", "8", "3", "4", "5", "6", "123", "10", "47"],
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["hi there", "3", "4", "6", "move", "123", "why hello!", "move", "47"]
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]
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def test_init_factory_dual():
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"""Tests init factory functions with dual main/alias factory functions"""
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from pybind11_tests.factory_constructors import TestFactory7
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cstats = [TestFactory7.get_cstats(), TestFactory7.get_alias_cstats()]
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cstats[0].alive() # force gc
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n_inst = ConstructorStats.detail_reg_inst()
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class PythFactory7(TestFactory7):
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def get(self):
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return 100 + TestFactory7.get(self)
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a1 = TestFactory7(1)
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a2 = PythFactory7(2)
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assert a1.get() == 1
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assert a2.get() == 102
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assert not a1.has_alias()
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assert a2.has_alias()
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b1 = TestFactory7(tag.pointer, 3)
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b2 = PythFactory7(tag.pointer, 4)
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assert b1.get() == 3
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assert b2.get() == 104
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assert not b1.has_alias()
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assert b2.has_alias()
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c1 = TestFactory7(tag.mixed, 5)
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c2 = PythFactory7(tag.mixed, 6)
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assert c1.get() == 5
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assert c2.get() == 106
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assert not c1.has_alias()
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assert c2.has_alias()
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d1 = TestFactory7(tag.base, tag.pointer, 7)
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d2 = PythFactory7(tag.base, tag.pointer, 8)
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assert d1.get() == 7
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assert d2.get() == 108
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assert not d1.has_alias()
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assert d2.has_alias()
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# Both return an alias; the second multiplies the value by 10:
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e1 = TestFactory7(tag.alias, tag.pointer, 9)
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e2 = PythFactory7(tag.alias, tag.pointer, 10)
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assert e1.get() == 9
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assert e2.get() == 200
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assert e1.has_alias()
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assert e2.has_alias()
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f1 = TestFactory7(tag.shared_ptr, tag.base, 11)
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f2 = PythFactory7(tag.shared_ptr, tag.base, 12)
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assert f1.get() == 11
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assert f2.get() == 112
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assert not f1.has_alias()
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assert f2.has_alias()
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g1 = TestFactory7(tag.shared_ptr, tag.invalid_base, 13)
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assert g1.get() == 13
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assert not g1.has_alias()
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with pytest.raises(TypeError) as excinfo:
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PythFactory7(tag.shared_ptr, tag.invalid_base, 14)
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assert (str(excinfo.value) ==
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"pybind11::init(): construction failed: returned holder-wrapped instance is not an "
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"alias instance")
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assert [i.alive() for i in cstats] == [13, 7]
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assert ConstructorStats.detail_reg_inst() == n_inst + 13
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del a1, a2, b1, d1, e1, e2
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assert [i.alive() for i in cstats] == [7, 4]
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assert ConstructorStats.detail_reg_inst() == n_inst + 7
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del b2, c1, c2, d2, f1, f2, g1
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assert [i.alive() for i in cstats] == [0, 0]
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assert ConstructorStats.detail_reg_inst() == n_inst
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assert [i.values() for i in cstats] == [
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["1", "2", "3", "4", "5", "6", "7", "8", "9", "100", "11", "12", "13", "14"],
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["2", "4", "6", "8", "9", "100", "12"]
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]
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def test_no_placement_new(capture):
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"""Prior to 2.2, `py::init<...>` relied on the type supporting placement
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new; this tests a class without placement new support."""
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with capture:
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a = m.NoPlacementNew(123)
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found = re.search(r'^operator new called, returning (\d+)\n$', str(capture))
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assert found
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assert a.i == 123
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with capture:
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del a
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pytest.gc_collect()
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assert capture == "operator delete called on " + found.group(1)
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with capture:
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b = m.NoPlacementNew()
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found = re.search(r'^operator new called, returning (\d+)\n$', str(capture))
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assert found
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assert b.i == 100
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with capture:
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del b
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pytest.gc_collect()
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assert capture == "operator delete called on " + found.group(1)
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def test_multiple_inheritance():
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class MITest(m.TestFactory1, m.TestFactory2):
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def __init__(self):
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m.TestFactory1.__init__(self, tag.unique_ptr, 33)
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m.TestFactory2.__init__(self, tag.move)
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a = MITest()
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assert m.TestFactory1.value.fget(a) == "33"
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assert m.TestFactory2.value.fget(a) == "(empty2)"
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def create_and_destroy(*args):
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a = m.NoisyAlloc(*args)
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print("---")
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del a
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pytest.gc_collect()
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def strip_comments(s):
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return re.sub(r'\s+#.*', '', s)
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def test_reallocations(capture, msg):
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"""When the constructor is overloaded, previous overloads can require a preallocated value.
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This test makes sure that such preallocated values only happen when they might be necessary,
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and that they are deallocated properly"""
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pytest.gc_collect()
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with capture:
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create_and_destroy(1)
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assert msg(capture) == """
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noisy new
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noisy placement new
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NoisyAlloc(int 1)
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---
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~NoisyAlloc()
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noisy delete
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"""
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with capture:
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create_and_destroy(1.5)
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assert msg(capture) == strip_comments("""
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noisy new # allocation required to attempt first overload
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noisy delete # have to dealloc before considering factory init overload
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noisy new # pointer factory calling "new", part 1: allocation
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NoisyAlloc(double 1.5) # ... part two, invoking constructor
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---
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~NoisyAlloc() # Destructor
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noisy delete # operator delete
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""")
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with capture:
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create_and_destroy(2, 3)
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assert msg(capture) == strip_comments("""
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noisy new # pointer factory calling "new", allocation
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NoisyAlloc(int 2) # constructor
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---
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~NoisyAlloc() # Destructor
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noisy delete # operator delete
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""")
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with capture:
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create_and_destroy(2.5, 3)
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assert msg(capture) == strip_comments("""
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NoisyAlloc(double 2.5) # construction (local func variable: operator_new not called)
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noisy new # return-by-value "new" part 1: allocation
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~NoisyAlloc() # moved-away local func variable destruction
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---
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~NoisyAlloc() # Destructor
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noisy delete # operator delete
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""")
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with capture:
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create_and_destroy(3.5, 4.5)
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assert msg(capture) == strip_comments("""
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noisy new # preallocation needed before invoking placement-new overload
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noisy placement new # Placement new
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NoisyAlloc(double 3.5) # construction
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---
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~NoisyAlloc() # Destructor
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noisy delete # operator delete
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""")
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with capture:
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create_and_destroy(4, 0.5)
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assert msg(capture) == strip_comments("""
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noisy new # preallocation needed before invoking placement-new overload
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noisy delete # deallocation of preallocated storage
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noisy new # Factory pointer allocation
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NoisyAlloc(int 4) # factory pointer construction
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---
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~NoisyAlloc() # Destructor
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noisy delete # operator delete
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""")
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with capture:
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create_and_destroy(5, "hi")
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assert msg(capture) == strip_comments("""
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noisy new # preallocation needed before invoking first placement new
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noisy delete # delete before considering new-style constructor
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noisy new # preallocation for second placement new
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noisy placement new # Placement new in the second placement new overload
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NoisyAlloc(int 5) # construction
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---
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~NoisyAlloc() # Destructor
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noisy delete # operator delete
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""")
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@pytest.unsupported_on_py2
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def test_invalid_self():
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"""Tests invocation of the pybind-registered base class with an invalid `self` argument. You
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can only actually do this on Python 3: Python 2 raises an exception itself if you try."""
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class NotPybindDerived(object):
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pass
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# Attempts to initialize with an invalid type passed as `self`:
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class BrokenTF1(m.TestFactory1):
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def __init__(self, bad):
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if bad == 1:
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a = m.TestFactory2(tag.pointer, 1)
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m.TestFactory1.__init__(a, tag.pointer)
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elif bad == 2:
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a = NotPybindDerived()
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m.TestFactory1.__init__(a, tag.pointer)
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# Same as above, but for a class with an alias:
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class BrokenTF6(m.TestFactory6):
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def __init__(self, bad):
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if bad == 1:
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a = m.TestFactory2(tag.pointer, 1)
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m.TestFactory6.__init__(a, tag.base, 1)
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elif bad == 2:
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a = m.TestFactory2(tag.pointer, 1)
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m.TestFactory6.__init__(a, tag.alias, 1)
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elif bad == 3:
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m.TestFactory6.__init__(NotPybindDerived.__new__(NotPybindDerived), tag.base, 1)
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elif bad == 4:
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m.TestFactory6.__init__(NotPybindDerived.__new__(NotPybindDerived), tag.alias, 1)
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for arg in (1, 2):
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with pytest.raises(TypeError) as excinfo:
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BrokenTF1(arg)
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assert str(excinfo.value) == "__init__(self, ...) called with invalid `self` argument"
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for arg in (1, 2, 3, 4):
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with pytest.raises(TypeError) as excinfo:
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BrokenTF6(arg)
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assert str(excinfo.value) == "__init__(self, ...) called with invalid `self` argument"
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