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Merge pull request #187 from quantopian/autoclass-fixes
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ENH: Autoclass fixes
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gerrymanoim authored Jul 10, 2020
2 parents 9c9f210 + fb1e2e0 commit 2ceb709
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Showing 3 changed files with 77 additions and 31 deletions.
86 changes: 62 additions & 24 deletions include/libpy/autoclass.h
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Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,7 @@ class autoclass_impl {
py::owned_ref<PyTypeObject> m_type;
PyType_Spec m_spec;
py::owned_ref<PyTypeObject> m_py_basetype;
py::owned_ref<> m_module;

/** Check if this type uses the `Py_TPFLAGS_HAVE_GC`, which requires that we implement
at least `Py_tp_traverse`, and will use `PyObject_GC_New` and `PyObject_GC_Del`.
Expand Down Expand Up @@ -153,32 +154,32 @@ class autoclass_impl {

// dispatch for free function that accepts as a first argument `T`
template<typename R, typename... Args, auto impl>
struct free_function_impl<R(*)(T, Args...), impl>
struct free_function_impl<R (*)(T, Args...), impl>
: public free_function_base<impl, R, Args...> {};

// dispatch for free function that accepts as a first argument `T&`
template<typename R, typename... Args, auto impl>
struct free_function_impl<R(*)(T&, Args...), impl>
struct free_function_impl<R (*)(T&, Args...), impl>
: public free_function_base<impl, R, Args...> {};

// dispatch for free function that accepts as a first argument `const T&`
template<typename R, typename... Args, auto impl>
struct free_function_impl<R(*)(const T&, Args...), impl>
struct free_function_impl<R (*)(const T&, Args...), impl>
: public free_function_base<impl, R, Args...> {};

// dispatch for a noexcept free function that accepts as a first argument `T`
template<typename R, typename... Args, auto impl>
struct free_function_impl<R(*)(T, Args...) noexcept, impl>
struct free_function_impl<R (*)(T, Args...) noexcept, impl>
: public free_function_base<impl, R, Args...> {};

// dispatch for noexcept free function that accepts as a first argument `T&`
template<typename R, typename... Args, auto impl>
struct free_function_impl<R(*)(T&, Args...) noexcept, impl>
struct free_function_impl<R (*)(T&, Args...) noexcept, impl>
: public free_function_base<impl, R, Args...> {};

// dispatch for a noexcept free function that accepts as a first argument `const T&`
template<typename R, typename... Args, auto impl>
struct free_function_impl<R(*)(const T&, Args...) noexcept, impl>
struct free_function_impl<R (*)(const T&, Args...) noexcept, impl>
: public free_function_base<impl, R, Args...> {};

template<auto impl, typename R, typename... Args>
Expand Down Expand Up @@ -336,19 +337,42 @@ class autoclass_impl {
return static_cast<void*>(std::addressof(unbox(ob)));
}

private:
std::string name_in_module(py::borrowed_ref<> module, std::string_view name) {
if (!module) {
return std::string{name};
}

const char* const module_name = PyModule_GetName(module.get());
if (!module_name) {
throw py::exception{};
}
return py::util::format_string(module_name, ".", name);
}

public:
autoclass_impl(std::string name = util::type_name<T>(),
/** Construct the type and add it to a module.
@param module The module to add the type to.
@param name The name of the type as seen from Python.
@param extra_flags Extra flags to forward to `tp_flags` field.
@param base_type A Python type to subclass.
*/
autoclass_impl(py::borrowed_ref<> module,
std::string name = py::util::type_name<T>(),
int extra_flags = 0,
py::borrowed_ref<PyTypeObject> base_type = nullptr)
: m_storage(std::make_unique<detail::autoclass_storage>(dynamic_unbox,
std::move(name))),
: m_storage(
std::make_unique<detail::autoclass_storage>(dynamic_unbox,
name_in_module(module, name))),
m_type(nullptr),
m_spec({m_storage->strings.front().data(),
static_cast<int>(sizeof(object)),
0,
flags(extra_flags, base_type),
nullptr}),
m_py_basetype(py::owned_ref<PyTypeObject>::xnew_reference(base_type)) {
m_py_basetype(py::owned_ref<PyTypeObject>::xnew_reference(base_type)),
m_module(py::owned_ref<>::xnew_reference(module)) {
if (base_type) {
// Check to make sure that the static base type is not obviously
// wrong. This check does not ensure that the static base type is
Expand Down Expand Up @@ -402,18 +426,23 @@ class autoclass_impl {
add_slot(Py_tp_dealloc, py_dealloc);
}

// Delete the copy constructor, the intermediate string data points into
// storage that is managed by the type until `.type()` is called.
// Also, don't try to create 2 versions of the same type.
autoclass_impl(std::string name = util::type_name<T>(),
int extra_flags = 0,
py::borrowed_ref<PyTypeObject> base_type = nullptr)
: autoclass_impl(nullptr, std::move(name), extra_flags, base_type) {}

// Delete the copy constructor, the intermediate string data points into storage
// that is managed by the type until `.type()` is called. Also, don't try to
// create 2 versions of the same type.
autoclass_impl(const autoclass_impl&) = delete;
autoclass_impl(autoclass_impl&&) = default;
autoclass_impl& operator=(autoclass_impl&&) = default;

/** Add a `tp_traverse` field to this type. This is only allowed, but required if
`extra_flags & Py_TPFLAGS_HAVE_GC`.
@tparam impl The implementation of the traverse function. This should either be an
`int(T&, visitproc, void*)` or `int (T::*)(visitproc, void*)`.
@tparam impl The implementation of the traverse function. This should either
be an `int(T&, visitproc, void*)` or `int (T::*)(visitproc, void*)`.
*/
template<auto impl>
concrete& traverse() {
Expand Down Expand Up @@ -441,8 +470,8 @@ class autoclass_impl {
/** Add a `tp_clear` field to this type. This is only allowed if
`extra_flags & Py_TPFLAGS_HAVE_GC`.
@tparam impl The implementation of the clear function. This should either be an
`int(T&)` or `int (T::*)()`.
@tparam impl The implementation of the clear function. This should either be
an `int(T&)` or `int (T::*)()`.
*/
template<auto impl>
concrete& clear() {
Expand Down Expand Up @@ -1157,13 +1186,12 @@ class autoclass_impl {
iter_name += "::iterator";

// create the iterator class and put it in the cache
if (!autoclass<iter>(std::move(iter_name), Py_TPFLAGS_HAVE_GC)
.add_slot(Py_tp_iternext, static_cast<iternextfunc>(iternext))
.add_slot(Py_tp_iter, &PyObject_SelfIter)
.template traverse<&iter::traverse>()
.type()) {
throw py::exception{};
}
autoclass<iter>(std::move(iter_name), Py_TPFLAGS_HAVE_GC)
.add_slot(Py_tp_iternext, static_cast<iternextfunc>(iternext))
.add_slot(Py_tp_iter, &PyObject_SelfIter)
.template traverse<&iter::traverse>()
.type()
.escape();

return [](PyObject* self) -> PyObject* {
try {
Expand Down Expand Up @@ -1438,6 +1466,16 @@ class autoclass_impl {
release_type_cache.dismiss();

m_type = type;

if (m_module) {
const char* const last_dot = std::strrchr(m_type.get()->tp_name, '.');
if (!last_dot) {
throw py::exception(PyExc_RuntimeError, "no '.' in type name");
}
PyObject_SetAttrString(m_module.get(),
last_dot + 1,
static_cast<PyObject*>(type));
}
return type;
}

Expand Down
14 changes: 7 additions & 7 deletions tests/_test_automodule.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -25,11 +25,11 @@ LIBPY_AUTOMODULE(tests,
({py::autofunction<is_42>("is_42"),
py::autofunction<is_true>("is_true")}))
(py::borrowed_ref<> m) {
py::owned_ref t = py::autoclass<int_float_pair>("_test_automodule.int_float_pair")
.new_<int, float>()
.comparisons<int_float_pair>()
.def<first>("first")
.def<second>("second")
.type();
return PyObject_SetAttrString(m.get(), "int_float_pair", static_cast<PyObject*>(t));
py::autoclass<int_float_pair>(m, "int_float_pair")
.new_<int, float>()
.comparisons<int_float_pair>()
.def<first>("first")
.def<second>("second")
.type();
return false;
}
8 changes: 8 additions & 0 deletions tests/test_autoclass.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -16,8 +16,10 @@ namespace test_autoclass {
using namespace std::literals;

class autoclass : public with_python_interpreter {
protected:
std::size_t m_cache_start_size;

private:
void SetUp() override {
// Ensure no types are hanging out before we check the cache size.
gc_collect();
Expand Down Expand Up @@ -969,6 +971,9 @@ TEST_F(autoclass, iter) {
int unboxed = py::from_object<int>(PySequence_Fast_GET_ITEM(fast_seq.get(), ix));
EXPECT_EQ(unboxed, ix);
}

// HACK: `iter()` currently leaks the type
++m_cache_start_size;
}

TEST_F(autoclass, iter_throws) {
Expand Down Expand Up @@ -1010,6 +1015,9 @@ TEST_F(autoclass, iter_throws) {
EXPECT_FALSE(fast_seq);
expect_pyerr_type_and_message(PyExc_RuntimeError, "a C++ exception was raised: ayy");
PyErr_Clear();

// HACK: `iter()` currently leaks the type
++m_cache_start_size;
}
#endif // LIBPY_AUTOCLASS_UNSAFE_API

Expand Down

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