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ai-content-maker/.venv/Lib/site-packages/torch/include/pybind11/detail/class.h

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/*
pybind11/detail/class.h: Python C API implementation details for py::class_
Copyright (c) 2017 Wenzel Jakob <wenzel.jakob@epfl.ch>
All rights reserved. Use of this source code is governed by a
BSD-style license that can be found in the LICENSE file.
*/
#pragma once
#include "../attr.h"
#include "../options.h"
PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
PYBIND11_NAMESPACE_BEGIN(detail)
#if !defined(PYPY_VERSION)
# define PYBIND11_BUILTIN_QUALNAME
# define PYBIND11_SET_OLDPY_QUALNAME(obj, nameobj)
#else
// In PyPy, we still set __qualname__ so that we can produce reliable function type
// signatures; in CPython this macro expands to nothing:
# define PYBIND11_SET_OLDPY_QUALNAME(obj, nameobj) \
setattr((PyObject *) obj, "__qualname__", nameobj)
#endif
inline std::string get_fully_qualified_tp_name(PyTypeObject *type) {
#if !defined(PYPY_VERSION)
return type->tp_name;
#else
auto module_name = handle((PyObject *) type).attr("__module__").cast<std::string>();
if (module_name == PYBIND11_BUILTINS_MODULE)
return type->tp_name;
else
return std::move(module_name) + "." + type->tp_name;
#endif
}
inline PyTypeObject *type_incref(PyTypeObject *type) {
Py_INCREF(type);
return type;
}
#if !defined(PYPY_VERSION)
/// `pybind11_static_property.__get__()`: Always pass the class instead of the instance.
extern "C" inline PyObject *pybind11_static_get(PyObject *self, PyObject * /*ob*/, PyObject *cls) {
return PyProperty_Type.tp_descr_get(self, cls, cls);
}
/// `pybind11_static_property.__set__()`: Just like the above `__get__()`.
extern "C" inline int pybind11_static_set(PyObject *self, PyObject *obj, PyObject *value) {
PyObject *cls = PyType_Check(obj) ? obj : (PyObject *) Py_TYPE(obj);
return PyProperty_Type.tp_descr_set(self, cls, value);
}
// Forward declaration to use in `make_static_property_type()`
inline void enable_dynamic_attributes(PyHeapTypeObject *heap_type);
/** A `static_property` is the same as a `property` but the `__get__()` and `__set__()`
methods are modified to always use the object type instead of a concrete instance.
Return value: New reference. */
inline PyTypeObject *make_static_property_type() {
constexpr auto *name = "pybind11_static_property";
auto name_obj = reinterpret_steal<object>(PYBIND11_FROM_STRING(name));
/* Danger zone: from now (and until PyType_Ready), make sure to
issue no Python C API calls which could potentially invoke the
garbage collector (the GC will call type_traverse(), which will in
turn find the newly constructed type in an invalid state) */
auto *heap_type = (PyHeapTypeObject *) PyType_Type.tp_alloc(&PyType_Type, 0);
if (!heap_type) {
pybind11_fail("make_static_property_type(): error allocating type!");
}
heap_type->ht_name = name_obj.inc_ref().ptr();
# ifdef PYBIND11_BUILTIN_QUALNAME
heap_type->ht_qualname = name_obj.inc_ref().ptr();
# endif
auto *type = &heap_type->ht_type;
type->tp_name = name;
type->tp_base = type_incref(&PyProperty_Type);
type->tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HEAPTYPE;
type->tp_descr_get = pybind11_static_get;
type->tp_descr_set = pybind11_static_set;
# if PY_VERSION_HEX >= 0x030C0000
// Since Python-3.12 property-derived types are required to
// have dynamic attributes (to set `__doc__`)
enable_dynamic_attributes(heap_type);
# endif
if (PyType_Ready(type) < 0) {
pybind11_fail("make_static_property_type(): failure in PyType_Ready()!");
}
setattr((PyObject *) type, "__module__", str("pybind11_builtins"));
PYBIND11_SET_OLDPY_QUALNAME(type, name_obj);
return type;
}
#else // PYPY
/** PyPy has some issues with the above C API, so we evaluate Python code instead.
This function will only be called once so performance isn't really a concern.
Return value: New reference. */
inline PyTypeObject *make_static_property_type() {
auto d = dict();
PyObject *result = PyRun_String(R"(\
class pybind11_static_property(property):
def __get__(self, obj, cls):
return property.__get__(self, cls, cls)
def __set__(self, obj, value):
cls = obj if isinstance(obj, type) else type(obj)
property.__set__(self, cls, value)
)",
Py_file_input,
d.ptr(),
d.ptr());
if (result == nullptr)
throw error_already_set();
Py_DECREF(result);
return (PyTypeObject *) d["pybind11_static_property"].cast<object>().release().ptr();
}
#endif // PYPY
/** Types with static properties need to handle `Type.static_prop = x` in a specific way.
By default, Python replaces the `static_property` itself, but for wrapped C++ types
we need to call `static_property.__set__()` in order to propagate the new value to
the underlying C++ data structure. */
extern "C" inline int pybind11_meta_setattro(PyObject *obj, PyObject *name, PyObject *value) {
// Use `_PyType_Lookup()` instead of `PyObject_GetAttr()` in order to get the raw
// descriptor (`property`) instead of calling `tp_descr_get` (`property.__get__()`).
PyObject *descr = _PyType_Lookup((PyTypeObject *) obj, name);
// The following assignment combinations are possible:
// 1. `Type.static_prop = value` --> descr_set: `Type.static_prop.__set__(value)`
// 2. `Type.static_prop = other_static_prop` --> setattro: replace existing `static_prop`
// 3. `Type.regular_attribute = value` --> setattro: regular attribute assignment
auto *const static_prop = (PyObject *) get_internals().static_property_type;
const auto call_descr_set = (descr != nullptr) && (value != nullptr)
&& (PyObject_IsInstance(descr, static_prop) != 0)
&& (PyObject_IsInstance(value, static_prop) == 0);
if (call_descr_set) {
// Call `static_property.__set__()` instead of replacing the `static_property`.
#if !defined(PYPY_VERSION)
return Py_TYPE(descr)->tp_descr_set(descr, obj, value);
#else
if (PyObject *result = PyObject_CallMethod(descr, "__set__", "OO", obj, value)) {
Py_DECREF(result);
return 0;
} else {
return -1;
}
#endif
} else {
// Replace existing attribute.
return PyType_Type.tp_setattro(obj, name, value);
}
}
/**
* Python 3's PyInstanceMethod_Type hides itself via its tp_descr_get, which prevents aliasing
* methods via cls.attr("m2") = cls.attr("m1"): instead the tp_descr_get returns a plain function,
* when called on a class, or a PyMethod, when called on an instance. Override that behaviour here
* to do a special case bypass for PyInstanceMethod_Types.
*/
extern "C" inline PyObject *pybind11_meta_getattro(PyObject *obj, PyObject *name) {
PyObject *descr = _PyType_Lookup((PyTypeObject *) obj, name);
if (descr && PyInstanceMethod_Check(descr)) {
Py_INCREF(descr);
return descr;
}
return PyType_Type.tp_getattro(obj, name);
}
/// metaclass `__call__` function that is used to create all pybind11 objects.
extern "C" inline PyObject *pybind11_meta_call(PyObject *type, PyObject *args, PyObject *kwargs) {
// use the default metaclass call to create/initialize the object
PyObject *self = PyType_Type.tp_call(type, args, kwargs);
if (self == nullptr) {
return nullptr;
}
// Ensure that the base __init__ function(s) were called
values_and_holders vhs(self);
for (const auto &vh : vhs) {
if (!vh.holder_constructed() && !vhs.is_redundant_value_and_holder(vh)) {
PyErr_Format(PyExc_TypeError,
"%.200s.__init__() must be called when overriding __init__",
get_fully_qualified_tp_name(vh.type->type).c_str());
Py_DECREF(self);
return nullptr;
}
}
return self;
}
/// Cleanup the type-info for a pybind11-registered type.
extern "C" inline void pybind11_meta_dealloc(PyObject *obj) {
auto *type = (PyTypeObject *) obj;
auto &internals = get_internals();
// A pybind11-registered type will:
// 1) be found in internals.registered_types_py
// 2) have exactly one associated `detail::type_info`
auto found_type = internals.registered_types_py.find(type);
if (found_type != internals.registered_types_py.end() && found_type->second.size() == 1
&& found_type->second[0]->type == type) {
auto *tinfo = found_type->second[0];
auto tindex = std::type_index(*tinfo->cpptype);
internals.direct_conversions.erase(tindex);
if (tinfo->module_local) {
get_local_internals().registered_types_cpp.erase(tindex);
} else {
internals.registered_types_cpp.erase(tindex);
}
internals.registered_types_py.erase(tinfo->type);
// Actually just `std::erase_if`, but that's only available in C++20
auto &cache = internals.inactive_override_cache;
for (auto it = cache.begin(), last = cache.end(); it != last;) {
if (it->first == (PyObject *) tinfo->type) {
it = cache.erase(it);
} else {
++it;
}
}
delete tinfo;
}
PyType_Type.tp_dealloc(obj);
}
/** This metaclass is assigned by default to all pybind11 types and is required in order
for static properties to function correctly. Users may override this using `py::metaclass`.
Return value: New reference. */
inline PyTypeObject *make_default_metaclass() {
constexpr auto *name = "pybind11_type";
auto name_obj = reinterpret_steal<object>(PYBIND11_FROM_STRING(name));
/* Danger zone: from now (and until PyType_Ready), make sure to
issue no Python C API calls which could potentially invoke the
garbage collector (the GC will call type_traverse(), which will in
turn find the newly constructed type in an invalid state) */
auto *heap_type = (PyHeapTypeObject *) PyType_Type.tp_alloc(&PyType_Type, 0);
if (!heap_type) {
pybind11_fail("make_default_metaclass(): error allocating metaclass!");
}
heap_type->ht_name = name_obj.inc_ref().ptr();
#ifdef PYBIND11_BUILTIN_QUALNAME
heap_type->ht_qualname = name_obj.inc_ref().ptr();
#endif
auto *type = &heap_type->ht_type;
type->tp_name = name;
type->tp_base = type_incref(&PyType_Type);
type->tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HEAPTYPE;
type->tp_call = pybind11_meta_call;
type->tp_setattro = pybind11_meta_setattro;
type->tp_getattro = pybind11_meta_getattro;
type->tp_dealloc = pybind11_meta_dealloc;
if (PyType_Ready(type) < 0) {
pybind11_fail("make_default_metaclass(): failure in PyType_Ready()!");
}
setattr((PyObject *) type, "__module__", str("pybind11_builtins"));
PYBIND11_SET_OLDPY_QUALNAME(type, name_obj);
return type;
}
/// For multiple inheritance types we need to recursively register/deregister base pointers for any
/// base classes with pointers that are difference from the instance value pointer so that we can
/// correctly recognize an offset base class pointer. This calls a function with any offset base
/// ptrs.
inline void traverse_offset_bases(void *valueptr,
const detail::type_info *tinfo,
instance *self,
bool (*f)(void * /*parentptr*/, instance * /*self*/)) {
for (handle h : reinterpret_borrow<tuple>(tinfo->type->tp_bases)) {
if (auto *parent_tinfo = get_type_info((PyTypeObject *) h.ptr())) {
for (auto &c : parent_tinfo->implicit_casts) {
if (c.first == tinfo->cpptype) {
auto *parentptr = c.second(valueptr);
if (parentptr != valueptr) {
f(parentptr, self);
}
traverse_offset_bases(parentptr, parent_tinfo, self, f);
break;
}
}
}
}
}
inline bool register_instance_impl(void *ptr, instance *self) {
get_internals().registered_instances.emplace(ptr, self);
return true; // unused, but gives the same signature as the deregister func
}
inline bool deregister_instance_impl(void *ptr, instance *self) {
auto &registered_instances = get_internals().registered_instances;
auto range = registered_instances.equal_range(ptr);
for (auto it = range.first; it != range.second; ++it) {
if (self == it->second) {
registered_instances.erase(it);
return true;
}
}
return false;
}
inline void register_instance(instance *self, void *valptr, const type_info *tinfo) {
register_instance_impl(valptr, self);
if (!tinfo->simple_ancestors) {
traverse_offset_bases(valptr, tinfo, self, register_instance_impl);
}
}
inline bool deregister_instance(instance *self, void *valptr, const type_info *tinfo) {
bool ret = deregister_instance_impl(valptr, self);
if (!tinfo->simple_ancestors) {
traverse_offset_bases(valptr, tinfo, self, deregister_instance_impl);
}
return ret;
}
/// Instance creation function for all pybind11 types. It allocates the internal instance layout
/// for holding C++ objects and holders. Allocation is done lazily (the first time the instance is
/// cast to a reference or pointer), and initialization is done by an `__init__` function.
inline PyObject *make_new_instance(PyTypeObject *type) {
#if defined(PYPY_VERSION)
// PyPy gets tp_basicsize wrong (issue 2482) under multiple inheritance when the first
// inherited object is a plain Python type (i.e. not derived from an extension type). Fix it.
ssize_t instance_size = static_cast<ssize_t>(sizeof(instance));
if (type->tp_basicsize < instance_size) {
type->tp_basicsize = instance_size;
}
#endif
PyObject *self = type->tp_alloc(type, 0);
auto *inst = reinterpret_cast<instance *>(self);
// Allocate the value/holder internals:
inst->allocate_layout();
return self;
}
/// Instance creation function for all pybind11 types. It only allocates space for the
/// C++ object, but doesn't call the constructor -- an `__init__` function must do that.
extern "C" inline PyObject *pybind11_object_new(PyTypeObject *type, PyObject *, PyObject *) {
return make_new_instance(type);
}
/// An `__init__` function constructs the C++ object. Users should provide at least one
/// of these using `py::init` or directly with `.def(__init__, ...)`. Otherwise, the
/// following default function will be used which simply throws an exception.
extern "C" inline int pybind11_object_init(PyObject *self, PyObject *, PyObject *) {
PyTypeObject *type = Py_TYPE(self);
std::string msg = get_fully_qualified_tp_name(type) + ": No constructor defined!";
set_error(PyExc_TypeError, msg.c_str());
return -1;
}
inline void add_patient(PyObject *nurse, PyObject *patient) {
auto &internals = get_internals();
auto *instance = reinterpret_cast<detail::instance *>(nurse);
instance->has_patients = true;
Py_INCREF(patient);
internals.patients[nurse].push_back(patient);
}
inline void clear_patients(PyObject *self) {
auto *instance = reinterpret_cast<detail::instance *>(self);
auto &internals = get_internals();
auto pos = internals.patients.find(self);
assert(pos != internals.patients.end());
// Clearing the patients can cause more Python code to run, which
// can invalidate the iterator. Extract the vector of patients
// from the unordered_map first.
auto patients = std::move(pos->second);
internals.patients.erase(pos);
instance->has_patients = false;
for (PyObject *&patient : patients) {
Py_CLEAR(patient);
}
}
/// Clears all internal data from the instance and removes it from registered instances in
/// preparation for deallocation.
inline void clear_instance(PyObject *self) {
auto *instance = reinterpret_cast<detail::instance *>(self);
// Deallocate any values/holders, if present:
for (auto &v_h : values_and_holders(instance)) {
if (v_h) {
// We have to deregister before we call dealloc because, for virtual MI types, we still
// need to be able to get the parent pointers.
if (v_h.instance_registered()
&& !deregister_instance(instance, v_h.value_ptr(), v_h.type)) {
pybind11_fail(
"pybind11_object_dealloc(): Tried to deallocate unregistered instance!");
}
if (instance->owned || v_h.holder_constructed()) {
v_h.type->dealloc(v_h);
}
}
}
// Deallocate the value/holder layout internals:
instance->deallocate_layout();
if (instance->weakrefs) {
PyObject_ClearWeakRefs(self);
}
PyObject **dict_ptr = _PyObject_GetDictPtr(self);
if (dict_ptr) {
Py_CLEAR(*dict_ptr);
}
if (instance->has_patients) {
clear_patients(self);
}
}
/// Instance destructor function for all pybind11 types. It calls `type_info.dealloc`
/// to destroy the C++ object itself, while the rest is Python bookkeeping.
extern "C" inline void pybind11_object_dealloc(PyObject *self) {
auto *type = Py_TYPE(self);
// If this is a GC tracked object, untrack it first
// Note that the track call is implicitly done by the
// default tp_alloc, which we never override.
if (PyType_HasFeature(type, Py_TPFLAGS_HAVE_GC) != 0) {
PyObject_GC_UnTrack(self);
}
clear_instance(self);
type->tp_free(self);
#if PY_VERSION_HEX < 0x03080000
// `type->tp_dealloc != pybind11_object_dealloc` means that we're being called
// as part of a derived type's dealloc, in which case we're not allowed to decref
// the type here. For cross-module compatibility, we shouldn't compare directly
// with `pybind11_object_dealloc`, but with the common one stashed in internals.
auto pybind11_object_type = (PyTypeObject *) get_internals().instance_base;
if (type->tp_dealloc == pybind11_object_type->tp_dealloc)
Py_DECREF(type);
#else
// This was not needed before Python 3.8 (Python issue 35810)
// https://github.com/pybind/pybind11/issues/1946
Py_DECREF(type);
#endif
}
std::string error_string();
/** Create the type which can be used as a common base for all classes. This is
needed in order to satisfy Python's requirements for multiple inheritance.
Return value: New reference. */
inline PyObject *make_object_base_type(PyTypeObject *metaclass) {
constexpr auto *name = "pybind11_object";
auto name_obj = reinterpret_steal<object>(PYBIND11_FROM_STRING(name));
/* Danger zone: from now (and until PyType_Ready), make sure to
issue no Python C API calls which could potentially invoke the
garbage collector (the GC will call type_traverse(), which will in
turn find the newly constructed type in an invalid state) */
auto *heap_type = (PyHeapTypeObject *) metaclass->tp_alloc(metaclass, 0);
if (!heap_type) {
pybind11_fail("make_object_base_type(): error allocating type!");
}
heap_type->ht_name = name_obj.inc_ref().ptr();
#ifdef PYBIND11_BUILTIN_QUALNAME
heap_type->ht_qualname = name_obj.inc_ref().ptr();
#endif
auto *type = &heap_type->ht_type;
type->tp_name = name;
type->tp_base = type_incref(&PyBaseObject_Type);
type->tp_basicsize = static_cast<ssize_t>(sizeof(instance));
type->tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HEAPTYPE;
type->tp_new = pybind11_object_new;
type->tp_init = pybind11_object_init;
type->tp_dealloc = pybind11_object_dealloc;
/* Support weak references (needed for the keep_alive feature) */
type->tp_weaklistoffset = offsetof(instance, weakrefs);
if (PyType_Ready(type) < 0) {
pybind11_fail("PyType_Ready failed in make_object_base_type(): " + error_string());
}
setattr((PyObject *) type, "__module__", str("pybind11_builtins"));
PYBIND11_SET_OLDPY_QUALNAME(type, name_obj);
assert(!PyType_HasFeature(type, Py_TPFLAGS_HAVE_GC));
return (PyObject *) heap_type;
}
/// dynamic_attr: Allow the garbage collector to traverse the internal instance `__dict__`.
extern "C" inline int pybind11_traverse(PyObject *self, visitproc visit, void *arg) {
#if PY_VERSION_HEX >= 0x030D0000
PyObject_VisitManagedDict(self, visit, arg);
#else
PyObject *&dict = *_PyObject_GetDictPtr(self);
Py_VISIT(dict);
#endif
// https://docs.python.org/3/c-api/typeobj.html#c.PyTypeObject.tp_traverse
#if PY_VERSION_HEX >= 0x03090000
Py_VISIT(Py_TYPE(self));
#endif
return 0;
}
/// dynamic_attr: Allow the GC to clear the dictionary.
extern "C" inline int pybind11_clear(PyObject *self) {
#if PY_VERSION_HEX >= 0x030D0000
PyObject_ClearManagedDict(self);
#else
PyObject *&dict = *_PyObject_GetDictPtr(self);
Py_CLEAR(dict);
#endif
return 0;
}
/// Give instances of this type a `__dict__` and opt into garbage collection.
inline void enable_dynamic_attributes(PyHeapTypeObject *heap_type) {
auto *type = &heap_type->ht_type;
type->tp_flags |= Py_TPFLAGS_HAVE_GC;
#if PY_VERSION_HEX < 0x030B0000
type->tp_dictoffset = type->tp_basicsize; // place dict at the end
type->tp_basicsize += (ssize_t) sizeof(PyObject *); // and allocate enough space for it
#else
type->tp_flags |= Py_TPFLAGS_MANAGED_DICT;
#endif
type->tp_traverse = pybind11_traverse;
type->tp_clear = pybind11_clear;
static PyGetSetDef getset[] = {{
#if PY_VERSION_HEX < 0x03070000
const_cast<char *>("__dict__"),
#else
"__dict__",
#endif
PyObject_GenericGetDict,
PyObject_GenericSetDict,
nullptr,
nullptr},
{nullptr, nullptr, nullptr, nullptr, nullptr}};
type->tp_getset = getset;
}
/// buffer_protocol: Fill in the view as specified by flags.
extern "C" inline int pybind11_getbuffer(PyObject *obj, Py_buffer *view, int flags) {
// Look for a `get_buffer` implementation in this type's info or any bases (following MRO).
type_info *tinfo = nullptr;
for (auto type : reinterpret_borrow<tuple>(Py_TYPE(obj)->tp_mro)) {
tinfo = get_type_info((PyTypeObject *) type.ptr());
if (tinfo && tinfo->get_buffer) {
break;
}
}
if (view == nullptr || !tinfo || !tinfo->get_buffer) {
if (view) {
view->obj = nullptr;
}
set_error(PyExc_BufferError, "pybind11_getbuffer(): Internal error");
return -1;
}
std::memset(view, 0, sizeof(Py_buffer));
buffer_info *info = tinfo->get_buffer(obj, tinfo->get_buffer_data);
if ((flags & PyBUF_WRITABLE) == PyBUF_WRITABLE && info->readonly) {
delete info;
// view->obj = nullptr; // Was just memset to 0, so not necessary
set_error(PyExc_BufferError, "Writable buffer requested for readonly storage");
return -1;
}
view->obj = obj;
view->ndim = 1;
view->internal = info;
view->buf = info->ptr;
view->itemsize = info->itemsize;
view->len = view->itemsize;
for (auto s : info->shape) {
view->len *= s;
}
view->readonly = static_cast<int>(info->readonly);
if ((flags & PyBUF_FORMAT) == PyBUF_FORMAT) {
view->format = const_cast<char *>(info->format.c_str());
}
if ((flags & PyBUF_STRIDES) == PyBUF_STRIDES) {
view->ndim = (int) info->ndim;
view->strides = info->strides.data();
view->shape = info->shape.data();
}
Py_INCREF(view->obj);
return 0;
}
/// buffer_protocol: Release the resources of the buffer.
extern "C" inline void pybind11_releasebuffer(PyObject *, Py_buffer *view) {
delete (buffer_info *) view->internal;
}
/// Give this type a buffer interface.
inline void enable_buffer_protocol(PyHeapTypeObject *heap_type) {
heap_type->ht_type.tp_as_buffer = &heap_type->as_buffer;
heap_type->as_buffer.bf_getbuffer = pybind11_getbuffer;
heap_type->as_buffer.bf_releasebuffer = pybind11_releasebuffer;
}
/** Create a brand new Python type according to the `type_record` specification.
Return value: New reference. */
inline PyObject *make_new_python_type(const type_record &rec) {
auto name = reinterpret_steal<object>(PYBIND11_FROM_STRING(rec.name));
auto qualname = name;
if (rec.scope && !PyModule_Check(rec.scope.ptr()) && hasattr(rec.scope, "__qualname__")) {
qualname = reinterpret_steal<object>(
PyUnicode_FromFormat("%U.%U", rec.scope.attr("__qualname__").ptr(), name.ptr()));
}
object module_;
if (rec.scope) {
if (hasattr(rec.scope, "__module__")) {
module_ = rec.scope.attr("__module__");
} else if (hasattr(rec.scope, "__name__")) {
module_ = rec.scope.attr("__name__");
}
}
const auto *full_name = c_str(
#if !defined(PYPY_VERSION)
module_ ? str(module_).cast<std::string>() + "." + rec.name :
#endif
rec.name);
char *tp_doc = nullptr;
if (rec.doc && options::show_user_defined_docstrings()) {
/* Allocate memory for docstring (using PyObject_MALLOC, since
Python will free this later on) */
size_t size = std::strlen(rec.doc) + 1;
tp_doc = (char *) PyObject_MALLOC(size);
std::memcpy((void *) tp_doc, rec.doc, size);
}
auto &internals = get_internals();
auto bases = tuple(rec.bases);
auto *base = (bases.empty()) ? internals.instance_base : bases[0].ptr();
/* Danger zone: from now (and until PyType_Ready), make sure to
issue no Python C API calls which could potentially invoke the
garbage collector (the GC will call type_traverse(), which will in
turn find the newly constructed type in an invalid state) */
auto *metaclass
= rec.metaclass.ptr() ? (PyTypeObject *) rec.metaclass.ptr() : internals.default_metaclass;
auto *heap_type = (PyHeapTypeObject *) metaclass->tp_alloc(metaclass, 0);
if (!heap_type) {
pybind11_fail(std::string(rec.name) + ": Unable to create type object!");
}
heap_type->ht_name = name.release().ptr();
#ifdef PYBIND11_BUILTIN_QUALNAME
heap_type->ht_qualname = qualname.inc_ref().ptr();
#endif
auto *type = &heap_type->ht_type;
type->tp_name = full_name;
type->tp_doc = tp_doc;
type->tp_base = type_incref((PyTypeObject *) base);
type->tp_basicsize = static_cast<ssize_t>(sizeof(instance));
if (!bases.empty()) {
type->tp_bases = bases.release().ptr();
}
/* Don't inherit base __init__ */
type->tp_init = pybind11_object_init;
/* Supported protocols */
type->tp_as_number = &heap_type->as_number;
type->tp_as_sequence = &heap_type->as_sequence;
type->tp_as_mapping = &heap_type->as_mapping;
type->tp_as_async = &heap_type->as_async;
/* Flags */
type->tp_flags |= Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HEAPTYPE;
if (!rec.is_final) {
type->tp_flags |= Py_TPFLAGS_BASETYPE;
}
if (rec.dynamic_attr) {
enable_dynamic_attributes(heap_type);
}
if (rec.buffer_protocol) {
enable_buffer_protocol(heap_type);
}
if (rec.custom_type_setup_callback) {
rec.custom_type_setup_callback(heap_type);
}
if (PyType_Ready(type) < 0) {
pybind11_fail(std::string(rec.name) + ": PyType_Ready failed: " + error_string());
}
assert(!rec.dynamic_attr || PyType_HasFeature(type, Py_TPFLAGS_HAVE_GC));
/* Register type with the parent scope */
if (rec.scope) {
setattr(rec.scope, rec.name, (PyObject *) type);
} else {
Py_INCREF(type); // Keep it alive forever (reference leak)
}
if (module_) { // Needed by pydoc
setattr((PyObject *) type, "__module__", module_);
}
PYBIND11_SET_OLDPY_QUALNAME(type, qualname);
return (PyObject *) type;
}
PYBIND11_NAMESPACE_END(detail)
PYBIND11_NAMESPACE_END(PYBIND11_NAMESPACE)
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