1 /*
2     tests/test_call_policies.cpp -- keep_alive and call_guard
3 
4     Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
5 
6     All rights reserved. Use of this source code is governed by a
7     BSD-style license that can be found in the LICENSE file.
8 */
9 
10 #include "pybind11_tests.h"
11 
12 struct CustomGuard {
13     static bool enabled;
14 
CustomGuardCustomGuard15     CustomGuard() { enabled = true; }
~CustomGuardCustomGuard16     ~CustomGuard() { enabled = false; }
17 
report_statusCustomGuard18     static const char *report_status() { return enabled ? "guarded" : "unguarded"; }
19 };
20 bool CustomGuard::enabled = false;
21 
22 struct DependentGuard {
23     static bool enabled;
24 
DependentGuardDependentGuard25     DependentGuard() { enabled = CustomGuard::enabled; }
~DependentGuardDependentGuard26     ~DependentGuard() { enabled = false; }
27 
report_statusDependentGuard28     static const char *report_status() { return enabled ? "guarded" : "unguarded"; }
29 };
30 bool DependentGuard::enabled = false;
31 
TEST_SUBMODULE(call_policies,m)32 TEST_SUBMODULE(call_policies, m) {
33     // Parent/Child are used in:
34     // test_keep_alive_argument, test_keep_alive_return_value, test_alive_gc_derived,
35     // test_alive_gc_multi_derived, test_return_none, test_keep_alive_constructor
36     class Child {
37     public:
38         Child() { py::print("Allocating child."); }
39         Child(const Child &) = default;
40         Child(Child &&) = default;
41         ~Child() { py::print("Releasing child."); }
42     };
43     py::class_<Child>(m, "Child")
44         .def(py::init<>());
45 
46     class Parent {
47     public:
48         Parent() { py::print("Allocating parent."); }
49         Parent(const Parent& parent) = default;
50         ~Parent() { py::print("Releasing parent."); }
51         void addChild(Child *) { }
52         Child *returnChild() { return new Child(); }
53         Child *returnNullChild() { return nullptr; }
54         static Child *staticFunction(Parent*) { return new Child(); }
55     };
56     py::class_<Parent>(m, "Parent")
57         .def(py::init<>())
58         .def(py::init([](Child *) { return new Parent(); }), py::keep_alive<1, 2>())
59         .def("addChild", &Parent::addChild)
60         .def("addChildKeepAlive", &Parent::addChild, py::keep_alive<1, 2>())
61         .def("returnChild", &Parent::returnChild)
62         .def("returnChildKeepAlive", &Parent::returnChild, py::keep_alive<1, 0>())
63         .def("returnNullChildKeepAliveChild", &Parent::returnNullChild, py::keep_alive<1, 0>())
64         .def("returnNullChildKeepAliveParent", &Parent::returnNullChild, py::keep_alive<0, 1>())
65         .def_static(
66             "staticFunction", &Parent::staticFunction, py::keep_alive<1, 0>());
67 
68     m.def("free_function", [](Parent*, Child*) {}, py::keep_alive<1, 2>());
69     m.def("invalid_arg_index", []{}, py::keep_alive<0, 1>());
70 
71 #if !defined(PYPY_VERSION)
72     // test_alive_gc
73     class ParentGC : public Parent {
74     public:
75         using Parent::Parent;
76     };
77     py::class_<ParentGC, Parent>(m, "ParentGC", py::dynamic_attr())
78         .def(py::init<>());
79 #endif
80 
81     // test_call_guard
82     m.def("unguarded_call", &CustomGuard::report_status);
83     m.def("guarded_call", &CustomGuard::report_status, py::call_guard<CustomGuard>());
84 
85     m.def("multiple_guards_correct_order", []() {
86         return CustomGuard::report_status() + std::string(" & ") + DependentGuard::report_status();
87     }, py::call_guard<CustomGuard, DependentGuard>());
88 
89     m.def("multiple_guards_wrong_order", []() {
90         return DependentGuard::report_status() + std::string(" & ") + CustomGuard::report_status();
91     }, py::call_guard<DependentGuard, CustomGuard>());
92 
93 #if defined(WITH_THREAD) && !defined(PYPY_VERSION)
94     // `py::call_guard<py::gil_scoped_release>()` should work in PyPy as well,
95     // but it's unclear how to test it without `PyGILState_GetThisThreadState`.
96     auto report_gil_status = []() {
97         auto is_gil_held = false;
98         if (auto tstate = py::detail::get_thread_state_unchecked())
99             is_gil_held = (tstate == PyGILState_GetThisThreadState());
100 
101         return is_gil_held ? "GIL held" : "GIL released";
102     };
103 
104     m.def("with_gil", report_gil_status);
105     m.def("without_gil", report_gil_status, py::call_guard<py::gil_scoped_release>());
106 #endif
107 }
108