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heaptype_relative.c
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heaptype_relative.c
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#ifndef _MSC_VER
#include "pyconfig.h" // Py_GIL_DISABLED
#endif
#ifndef Py_GIL_DISABLED
#define Py_LIMITED_API 0x030c0000 // 3.12
#endif
#include "parts.h"
#include <stddef.h> // max_align_t
#include <string.h> // memset
static PyType_Slot empty_slots[] = {
{0, NULL},
};
static PyObject *
make_sized_heaptypes(PyObject *module, PyObject *args)
{
PyObject *base = NULL;
PyObject *sub = NULL;
PyObject *instance = NULL;
PyObject *result = NULL;
int extra_base_size, basicsize;
int r = PyArg_ParseTuple(args, "ii", &extra_base_size, &basicsize);
if (!r) {
goto finally;
}
PyType_Spec base_spec = {
.name = "_testcapi.Base",
.basicsize = sizeof(PyObject) + extra_base_size,
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
.slots = empty_slots,
};
PyType_Spec sub_spec = {
.name = "_testcapi.Sub",
.basicsize = basicsize,
.flags = Py_TPFLAGS_DEFAULT,
.slots = empty_slots,
};
base = PyType_FromMetaclass(NULL, module, &base_spec, NULL);
if (!base) {
goto finally;
}
sub = PyType_FromMetaclass(NULL, module, &sub_spec, base);
if (!sub) {
goto finally;
}
instance = PyObject_CallNoArgs(sub);
if (!instance) {
goto finally;
}
char *data_ptr = PyObject_GetTypeData(instance, (PyTypeObject *)sub);
if (!data_ptr) {
goto finally;
}
Py_ssize_t data_size = PyType_GetTypeDataSize((PyTypeObject *)sub);
if (data_size < 0) {
goto finally;
}
result = Py_BuildValue("OOOKnn", base, sub, instance,
(unsigned long long)data_ptr,
(Py_ssize_t)(data_ptr - (char*)instance),
data_size);
finally:
Py_XDECREF(base);
Py_XDECREF(sub);
Py_XDECREF(instance);
return result;
}
static PyObject *
var_heaptype_set_data_to_3s(
PyObject *self, PyTypeObject *defining_class,
PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
{
void *data_ptr = PyObject_GetTypeData(self, defining_class);
if (!data_ptr) {
return NULL;
}
Py_ssize_t data_size = PyType_GetTypeDataSize(defining_class);
if (data_size < 0) {
return NULL;
}
memset(data_ptr, 3, data_size);
Py_RETURN_NONE;
}
static PyObject *
var_heaptype_get_data(PyObject *self, PyTypeObject *defining_class,
PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
{
void *data_ptr = PyObject_GetTypeData(self, defining_class);
if (!data_ptr) {
return NULL;
}
Py_ssize_t data_size = PyType_GetTypeDataSize(defining_class);
if (data_size < 0) {
return NULL;
}
return PyBytes_FromStringAndSize(data_ptr, data_size);
}
static PyMethodDef var_heaptype_methods[] = {
{"set_data_to_3s", _PyCFunction_CAST(var_heaptype_set_data_to_3s),
METH_METHOD | METH_FASTCALL | METH_KEYWORDS},
{"get_data", _PyCFunction_CAST(var_heaptype_get_data),
METH_METHOD | METH_FASTCALL | METH_KEYWORDS},
{NULL},
};
static PyObject *
subclass_var_heaptype(PyObject *module, PyObject *args)
{
PyObject *result = NULL;
PyObject *base; // borrowed from args
int basicsize, itemsize;
long pfunc;
int r = PyArg_ParseTuple(args, "Oiil", &base, &basicsize, &itemsize, &pfunc);
if (!r) {
goto finally;
}
PyType_Slot slots[] = {
{Py_tp_methods, var_heaptype_methods},
{0, NULL},
};
PyType_Spec sub_spec = {
.name = "_testcapi.Sub",
.basicsize = basicsize,
.itemsize = itemsize,
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_ITEMS_AT_END,
.slots = slots,
};
result = PyType_FromMetaclass(NULL, module, &sub_spec, base);
finally:
return result;
}
static PyObject *
subclass_heaptype(PyObject *module, PyObject *args)
{
PyObject *result = NULL;
PyObject *base; // borrowed from args
int basicsize, itemsize;
int r = PyArg_ParseTuple(args, "Oii", &base, &basicsize, &itemsize);
if (!r) {
goto finally;
}
PyType_Slot slots[] = {
{Py_tp_methods, var_heaptype_methods},
{0, NULL},
};
PyType_Spec sub_spec = {
.name = "_testcapi.Sub",
.basicsize = basicsize,
.itemsize = itemsize,
.flags = Py_TPFLAGS_DEFAULT,
.slots = slots,
};
result = PyType_FromMetaclass(NULL, module, &sub_spec, base);
finally:
return result;
}
static PyMemberDef *
heaptype_with_member_extract_and_check_memb(PyObject *self)
{
PyMemberDef *def = PyType_GetSlot(Py_TYPE(self), Py_tp_members);
if (!def) {
if (!PyErr_Occurred()) {
PyErr_SetString(PyExc_ValueError, "tp_members is NULL");
}
return NULL;
}
if (!def[0].name) {
PyErr_SetString(PyExc_ValueError, "tp_members[0] is NULL");
return NULL;
}
if (def[1].name) {
PyErr_SetString(PyExc_ValueError, "tp_members[1] is not NULL");
return NULL;
}
if (strcmp(def[0].name, "memb")) {
PyErr_SetString(PyExc_ValueError, "tp_members[0] is not for `memb`");
return NULL;
}
if (def[0].flags) {
PyErr_SetString(PyExc_ValueError, "tp_members[0] has flags set");
return NULL;
}
return def;
}
static PyObject *
heaptype_with_member_get_memb(PyObject *self, PyObject *Py_UNUSED(ignored))
{
PyMemberDef *def = heaptype_with_member_extract_and_check_memb(self);
return PyMember_GetOne((const char *)self, def);
}
static PyObject *
heaptype_with_member_set_memb(PyObject *self, PyObject *value)
{
PyMemberDef *def = heaptype_with_member_extract_and_check_memb(self);
int r = PyMember_SetOne((char *)self, def, value);
if (r < 0) {
return NULL;
}
Py_RETURN_NONE;
}
static PyObject *
get_memb_offset(PyObject *self, PyObject *Py_UNUSED(ignored))
{
PyMemberDef *def = heaptype_with_member_extract_and_check_memb(self);
return PyLong_FromSsize_t(def->offset);
}
static PyObject *
heaptype_with_member_get_memb_relative(PyObject *self, PyObject *Py_UNUSED(ignored))
{
PyMemberDef def = {"memb", Py_T_BYTE, sizeof(PyObject), Py_RELATIVE_OFFSET};
return PyMember_GetOne((const char *)self, &def);
}
static PyObject *
heaptype_with_member_set_memb_relative(PyObject *self, PyObject *value)
{
PyMemberDef def = {"memb", Py_T_BYTE, sizeof(PyObject), Py_RELATIVE_OFFSET};
int r = PyMember_SetOne((char *)self, &def, value);
if (r < 0) {
return NULL;
}
Py_RETURN_NONE;
}
static PyMethodDef heaptype_with_member_methods[] = {
{"get_memb", heaptype_with_member_get_memb, METH_NOARGS},
{"set_memb", heaptype_with_member_set_memb, METH_O},
{"get_memb_offset", get_memb_offset, METH_NOARGS},
{"get_memb_relative", heaptype_with_member_get_memb_relative, METH_NOARGS},
{"set_memb_relative", heaptype_with_member_set_memb_relative, METH_O},
{NULL},
};
static PyObject *
make_heaptype_with_member(PyObject *module, PyObject *args)
{
PyObject *base = NULL;
PyObject *result = NULL;
int extra_base_size, basicsize, offset, add_flag;
int r = PyArg_ParseTuple(args, "iiip", &extra_base_size, &basicsize, &offset, &add_flag);
if (!r) {
goto finally;
}
PyType_Spec base_spec = {
.name = "_testcapi.Base",
.basicsize = sizeof(PyObject) + extra_base_size,
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
.slots = empty_slots,
};
base = PyType_FromMetaclass(NULL, module, &base_spec, NULL);
if (!base) {
goto finally;
}
PyMemberDef members[] = {
{"memb", Py_T_BYTE, offset, add_flag ? Py_RELATIVE_OFFSET : 0},
{0},
};
PyType_Slot slots[] = {
{Py_tp_members, members},
{Py_tp_methods, heaptype_with_member_methods},
{0, NULL},
};
PyType_Spec sub_spec = {
.name = "_testcapi.Sub",
.basicsize = basicsize,
.flags = Py_TPFLAGS_DEFAULT,
.slots = slots,
};
result = PyType_FromMetaclass(NULL, module, &sub_spec, base);
finally:
Py_XDECREF(base);
return result;
}
static PyObject *
test_alignof_max_align_t(PyObject *module, PyObject *Py_UNUSED(ignored))
{
// We define ALIGNOF_MAX_ALIGN_T even if the compiler doesn't support
// max_align_t. Double-check that it's correct.
assert(ALIGNOF_MAX_ALIGN_T > 0);
assert(ALIGNOF_MAX_ALIGN_T >= _Alignof(long long));
assert(ALIGNOF_MAX_ALIGN_T >= _Alignof(long double));
assert(ALIGNOF_MAX_ALIGN_T >= _Alignof(void*));
assert(ALIGNOF_MAX_ALIGN_T >= _Alignof(void (*)(void)));
// Ensure it's a power of two
assert((ALIGNOF_MAX_ALIGN_T & (ALIGNOF_MAX_ALIGN_T - 1)) == 0);
Py_RETURN_NONE;
}
static PyMethodDef TestMethods[] = {
{"make_sized_heaptypes", make_sized_heaptypes, METH_VARARGS},
{"subclass_var_heaptype", subclass_var_heaptype, METH_VARARGS},
{"subclass_heaptype", subclass_heaptype, METH_VARARGS},
{"make_heaptype_with_member", make_heaptype_with_member, METH_VARARGS},
{"test_alignof_max_align_t", test_alignof_max_align_t, METH_NOARGS},
{NULL},
};
int
_PyTestCapi_Init_HeaptypeRelative(PyObject *m) {
if (PyModule_AddFunctions(m, TestMethods) < 0) {
return -1;
}
if (PyModule_AddIntMacro(m, ALIGNOF_MAX_ALIGN_T) < 0) {
return -1;
}
return 0;
}