_testcapimodule.c

/*
 * C Extension module to test Python interpreter C APIs.
 *
 * The 'test_*' functions exported by this module are run as part of the
 * standard Python regression test, via Lib/test/test_capi.py.
 */

/* This module tests the public (Include/ and Include/cpython/) C API.
   The internal C API must not be used here: use _testinternalcapi for that.

   The Visual Studio projects builds _testcapi with Py_BUILD_CORE_MODULE
   macro defined, but only the public C API must be tested here. */

#undef Py_BUILD_CORE_MODULE
#undef Py_BUILD_CORE_BUILTIN

/* Always enable assertions */
#undef NDEBUG

#define PY_SSIZE_T_CLEAN

#include "Python.h"
#include "frameobject.h"          // PyFrame_Check()
#include "datetime.h"             // PyDateTimeAPI
#include "marshal.h"              // PyMarshal_WriteLongToFile
#include "structmember.h"         // PyMemberDef
#include <float.h>                // FLT_MAX
#include <signal.h>

#ifdef MS_WINDOWS
#  include <winsock2.h>           // struct timeval
#endif

#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>             // W_STOPCODE
#endif

#ifdef Py_BUILD_CORE
#  error "_testcapi must test the public Python C API, not CPython internal C API"
#endif


// Forward declarations
static struct PyModuleDef _testcapimodule;
static PyType_Spec HeapTypeNameType_Spec;
static PyObject *TestError;     /* set to exception object in init */


/* Raise TestError with test_name + ": " + msg, and return NULL. */

static PyObject *
raiseTestError(const char* test_name, const char* msg)
{
    PyErr_Format(TestError, "%s: %s", test_name, msg);
    return NULL;
}

/* Test #defines from pyconfig.h (particularly the SIZEOF_* defines).

   The ones derived from autoconf on the UNIX-like OSes can be relied
   upon (in the absence of sloppy cross-compiling), but the Windows
   platforms have these hardcoded.  Better safe than sorry.
*/
static PyObject*
sizeof_error(const char* fatname, const char* typname,
    int expected, int got)
{
    PyErr_Format(TestError,
        "%s #define == %d but sizeof(%s) == %d",
        fatname, expected, typname, got);
    return (PyObject*)NULL;
}

static PyObject*
test_config(PyObject *self, PyObject *Py_UNUSED(ignored))
{
#define CHECK_SIZEOF(FATNAME, TYPE) \
            if (FATNAME != sizeof(TYPE)) \
                return sizeof_error(#FATNAME, #TYPE, FATNAME, sizeof(TYPE))

    CHECK_SIZEOF(SIZEOF_SHORT, short);
    CHECK_SIZEOF(SIZEOF_INT, int);
    CHECK_SIZEOF(SIZEOF_LONG, long);
    CHECK_SIZEOF(SIZEOF_VOID_P, void*);
    CHECK_SIZEOF(SIZEOF_TIME_T, time_t);
    CHECK_SIZEOF(SIZEOF_LONG_LONG, long long);

#undef CHECK_SIZEOF

    Py_RETURN_NONE;
}

static PyObject*
test_sizeof_c_types(PyObject *self, PyObject *Py_UNUSED(ignored))
{
#if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ > 5)))
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wtype-limits"
#endif
#define CHECK_SIZEOF(TYPE, EXPECTED)         \
    if (EXPECTED != sizeof(TYPE))  {         \
        PyErr_Format(TestError,              \
            "sizeof(%s) = %u instead of %u", \
            #TYPE, sizeof(TYPE), EXPECTED);  \
        return (PyObject*)NULL;              \
    }
#define IS_SIGNED(TYPE) (((TYPE)-1) < (TYPE)0)
#define CHECK_SIGNNESS(TYPE, SIGNED)         \
    if (IS_SIGNED(TYPE) != SIGNED) {         \
        PyErr_Format(TestError,              \
            "%s signness is, instead of %i",  \
            #TYPE, IS_SIGNED(TYPE), SIGNED); \
        return (PyObject*)NULL;              \
    }

    /* integer types */
    CHECK_SIZEOF(Py_UCS1, 1);
    CHECK_SIZEOF(Py_UCS2, 2);
    CHECK_SIZEOF(Py_UCS4, 4);
    CHECK_SIGNNESS(Py_UCS1, 0);
    CHECK_SIGNNESS(Py_UCS2, 0);
    CHECK_SIGNNESS(Py_UCS4, 0);
    CHECK_SIZEOF(int32_t, 4);
    CHECK_SIGNNESS(int32_t, 1);
    CHECK_SIZEOF(uint32_t, 4);
    CHECK_SIGNNESS(uint32_t, 0);
    CHECK_SIZEOF(int64_t, 8);
    CHECK_SIGNNESS(int64_t, 1);
    CHECK_SIZEOF(uint64_t, 8);
    CHECK_SIGNNESS(uint64_t, 0);

    /* pointer/size types */
    CHECK_SIZEOF(size_t, sizeof(void *));
    CHECK_SIGNNESS(size_t, 0);
    CHECK_SIZEOF(Py_ssize_t, sizeof(void *));
    CHECK_SIGNNESS(Py_ssize_t, 1);

    CHECK_SIZEOF(uintptr_t, sizeof(void *));
    CHECK_SIGNNESS(uintptr_t, 0);
    CHECK_SIZEOF(intptr_t, sizeof(void *));
    CHECK_SIGNNESS(intptr_t, 1);

    Py_RETURN_NONE;

#undef IS_SIGNED
#undef CHECK_SIGNESS
#undef CHECK_SIZEOF
#if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ > 5)))
#pragma GCC diagnostic pop
#endif
}

static PyObject*
test_gc_control(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    int orig_enabled = PyGC_IsEnabled();
    const char* msg = "ok";
    int old_state;

    old_state = PyGC_Enable();
    msg = "Enable(1)";
    if (old_state != orig_enabled) {
        goto failed;
    }
    msg = "IsEnabled(1)";
    if (!PyGC_IsEnabled()) {
        goto failed;
    }

    old_state = PyGC_Disable();
    msg = "disable(2)";
    if (!old_state) {
        goto failed;
    }
    msg = "IsEnabled(2)";
    if (PyGC_IsEnabled()) {
        goto failed;
    }

    old_state = PyGC_Enable();
    msg = "enable(3)";
    if (old_state) {
        goto failed;
    }
    msg = "IsEnabled(3)";
    if (!PyGC_IsEnabled()) {
        goto failed;
    }

    if (!orig_enabled) {
        old_state = PyGC_Disable();
        msg = "disable(4)";
        if (old_state) {
            goto failed;
        }
        msg = "IsEnabled(4)";
        if (PyGC_IsEnabled()) {
            goto failed;
        }
    }

    Py_RETURN_NONE;

failed:
    /* Try to clean up if we can. */
    if (orig_enabled) {
        PyGC_Enable();
    } else {
        PyGC_Disable();
    }
    PyErr_Format(TestError, "GC control failed in %s", msg);
    return NULL;
}

static PyObject*
test_list_api(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject* list;
    int i;

    /* SF bug 132008:  PyList_Reverse segfaults */
#define NLIST 30
    list = PyList_New(NLIST);
    if (list == (PyObject*)NULL)
        return (PyObject*)NULL;
    /* list = range(NLIST) */
    for (i = 0; i < NLIST; ++i) {
        PyObject* anint = PyLong_FromLong(i);
        if (anint == (PyObject*)NULL) {
            Py_DECREF(list);
            return (PyObject*)NULL;
        }
        PyList_SET_ITEM(list, i, anint);
    }
    /* list.reverse(), via PyList_Reverse() */
    i = PyList_Reverse(list);   /* should not blow up! */
    if (i != 0) {
        Py_DECREF(list);
        return (PyObject*)NULL;
    }
    /* Check that list == range(29, -1, -1) now */
    for (i = 0; i < NLIST; ++i) {
        PyObject* anint = PyList_GET_ITEM(list, i);
        if (PyLong_AS_LONG(anint) != NLIST-1-i) {
            PyErr_SetString(TestError,
                            "test_list_api: reverse screwed up");
            Py_DECREF(list);
            return (PyObject*)NULL;
        }
    }
    Py_DECREF(list);
#undef NLIST

    Py_RETURN_NONE;
}

static int
test_dict_inner(int count)
{
    Py_ssize_t pos = 0, iterations = 0;
    int i;
    PyObject *dict = PyDict_New();
    PyObject *v, *k;

    if (dict == NULL)
        return -1;

    for (i = 0; i < count; i++) {
        v = PyLong_FromLong(i);
        if (v == NULL) {
            return -1;
        }
        if (PyDict_SetItem(dict, v, v) < 0) {
            Py_DECREF(v);
            return -1;
        }
        Py_DECREF(v);
    }

    while (PyDict_Next(dict, &pos, &k, &v)) {
        PyObject *o;
        iterations++;

        i = PyLong_AS_LONG(v) + 1;
        o = PyLong_FromLong(i);
        if (o == NULL)
            return -1;
        if (PyDict_SetItem(dict, k, o) < 0) {
            Py_DECREF(o);
            return -1;
        }
        Py_DECREF(o);
    }

    Py_DECREF(dict);

    if (iterations != count) {
        PyErr_SetString(
            TestError,
            "test_dict_iteration: dict iteration went wrong ");
        return -1;
    } else {
        return 0;
    }
}

static PyObject*
test_dict_iteration(PyObject* self, PyObject *Py_UNUSED(ignored))
{
    int i;

    for (i = 0; i < 200; i++) {
        if (test_dict_inner(i) < 0) {
            return NULL;
        }
    }

    Py_RETURN_NONE;
}

static PyObject*
dict_getitem_knownhash(PyObject *self, PyObject *args)
{
    PyObject *mp, *key, *result;
    Py_ssize_t hash;

    if (!PyArg_ParseTuple(args, "OOn:dict_getitem_knownhash",
                          &mp, &key, &hash)) {
        return NULL;
    }

    result = _PyDict_GetItem_KnownHash(mp, key, (Py_hash_t)hash);
    if (result == NULL && !PyErr_Occurred()) {
        _PyErr_SetKeyError(key);
        return NULL;
    }

    Py_XINCREF(result);
    return result;
}

/* Issue #4701: Check that PyObject_Hash implicitly calls
 *   PyType_Ready if it hasn't already been called
 */
static PyTypeObject _HashInheritanceTester_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "hashinheritancetester",            /* Name of this type */
    sizeof(PyObject),           /* Basic object size */
    0,                          /* Item size for varobject */
    (destructor)PyObject_Del, /* tp_dealloc */
    0,                          /* tp_vectorcall_offset */
    0,                          /* tp_getattr */
    0,                          /* tp_setattr */
    0,                          /* tp_as_async */
    0,                          /* tp_repr */
    0,                          /* tp_as_number */
    0,                          /* tp_as_sequence */
    0,                          /* tp_as_mapping */
    0,                          /* tp_hash */
    0,                          /* tp_call */
    0,                          /* tp_str */
    PyObject_GenericGetAttr,  /* tp_getattro */
    0,                          /* tp_setattro */
    0,                          /* tp_as_buffer */
    Py_TPFLAGS_DEFAULT,         /* tp_flags */
    0,                          /* tp_doc */
    0,                          /* tp_traverse */
    0,                          /* tp_clear */
    0,                          /* tp_richcompare */
    0,                          /* tp_weaklistoffset */
    0,                          /* tp_iter */
    0,                          /* tp_iternext */
    0,                          /* tp_methods */
    0,                          /* tp_members */
    0,                          /* tp_getset */
    0,                          /* tp_base */
    0,                          /* tp_dict */
    0,                          /* tp_descr_get */
    0,                          /* tp_descr_set */
    0,                          /* tp_dictoffset */
    0,                          /* tp_init */
    0,                          /* tp_alloc */
    PyType_GenericNew,                  /* tp_new */
};

static PyObject*
pycompilestring(PyObject* self, PyObject *obj) {
    if (PyBytes_CheckExact(obj) == 0) {
        PyErr_SetString(PyExc_ValueError, "Argument must be a bytes object");
        return NULL;
    }
    const char *the_string = PyBytes_AsString(obj);
    if (the_string == NULL) {
        return NULL;
    }
    return Py_CompileString(the_string, "<string>", Py_file_input);
}

static PyObject*
test_lazy_hash_inheritance(PyObject* self, PyObject *Py_UNUSED(ignored))
{
    PyTypeObject *type;
    PyObject *obj;
    Py_hash_t hash;

    type = &_HashInheritanceTester_Type;

    if (type->tp_dict != NULL)
        /* The type has already been initialized. This probably means
           -R is being used. */
        Py_RETURN_NONE;


    obj = PyObject_New(PyObject, type);
    if (obj == NULL) {
        PyErr_Clear();
        PyErr_SetString(
            TestError,
            "test_lazy_hash_inheritance: failed to create object");
        return NULL;
    }

    if (type->tp_dict != NULL) {
        PyErr_SetString(
            TestError,
            "test_lazy_hash_inheritance: type initialised too soon");
        Py_DECREF(obj);
        return NULL;
    }

    hash = PyObject_Hash(obj);
    if ((hash == -1) && PyErr_Occurred()) {
        PyErr_Clear();
        PyErr_SetString(
            TestError,
            "test_lazy_hash_inheritance: could not hash object");
        Py_DECREF(obj);
        return NULL;
    }

    if (type->tp_dict == NULL) {
        PyErr_SetString(
            TestError,
            "test_lazy_hash_inheritance: type not initialised by hash()");
        Py_DECREF(obj);
        return NULL;
    }

    if (type->tp_hash != PyType_Type.tp_hash) {
        PyErr_SetString(
            TestError,
            "test_lazy_hash_inheritance: unexpected hash function");
        Py_DECREF(obj);
        return NULL;
    }

    Py_DECREF(obj);

    Py_RETURN_NONE;
}


/* Tests of PyLong_{As, From}{Unsigned,}Long(), and
   PyLong_{As, From}{Unsigned,}LongLong().

   Note that the meat of the test is contained in testcapi_long.h.
   This is revolting, but delicate code duplication is worse:  "almost
   exactly the same" code is needed to test long long, but the ubiquitous
   dependence on type names makes it impossible to use a parameterized
   function.  A giant macro would be even worse than this.  A C++ template
   would be perfect.

   The "report an error" functions are deliberately not part of the #include
   file:  if the test fails, you can set a breakpoint in the appropriate
   error function directly, and crawl back from there in the debugger.
*/

#define UNBIND(X)  Py_DECREF(X); (X) = NULL

static PyObject *
raise_test_long_error(const char* msg)
{
    return raiseTestError("test_long_api", msg);
}

#define TESTNAME        test_long_api_inner
#define TYPENAME        long
#define F_S_TO_PY       PyLong_FromLong
#define F_PY_TO_S       PyLong_AsLong
#define F_U_TO_PY       PyLong_FromUnsignedLong
#define F_PY_TO_U       PyLong_AsUnsignedLong

#include "testcapi_long.h"

static PyObject *
test_long_api(PyObject* self, PyObject *Py_UNUSED(ignored))
{
    return TESTNAME(raise_test_long_error);
}

#undef TESTNAME
#undef TYPENAME
#undef F_S_TO_PY
#undef F_PY_TO_S
#undef F_U_TO_PY
#undef F_PY_TO_U

static PyObject *
raise_test_longlong_error(const char* msg)
{
    return raiseTestError("test_longlong_api", msg);
}

#define TESTNAME        test_longlong_api_inner
#define TYPENAME        long long
#define F_S_TO_PY       PyLong_FromLongLong
#define F_PY_TO_S       PyLong_AsLongLong
#define F_U_TO_PY       PyLong_FromUnsignedLongLong
#define F_PY_TO_U       PyLong_AsUnsignedLongLong

#include "testcapi_long.h"

static PyObject *
test_longlong_api(PyObject* self, PyObject *args)
{
    return TESTNAME(raise_test_longlong_error);
}

#undef TESTNAME
#undef TYPENAME
#undef F_S_TO_PY
#undef F_PY_TO_S
#undef F_U_TO_PY
#undef F_PY_TO_U

/* Test the PyLong_AsLongAndOverflow API. General conversion to PY_LONG
   is tested by test_long_api_inner. This test will concentrate on proper
   handling of overflow.
*/

static PyObject *
test_long_and_overflow(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *num, *one, *temp;
    long value;
    int overflow;

    /* Test that overflow is set properly for a large value. */
    /* num is a number larger than LONG_MAX even on 64-bit platforms */
    num = PyLong_FromString("FFFFFFFFFFFFFFFFFFFFFFFF", NULL, 16);
    if (num == NULL)
        return NULL;
    overflow = 1234;
    value = PyLong_AsLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != -1)
        return raiseTestError("test_long_and_overflow",
            "return value was not set to -1");
    if (overflow != 1)
        return raiseTestError("test_long_and_overflow",
            "overflow was not set to 1");

    /* Same again, with num = LONG_MAX + 1 */
    num = PyLong_FromLong(LONG_MAX);
    if (num == NULL)
        return NULL;
    one = PyLong_FromLong(1L);
    if (one == NULL) {
        Py_DECREF(num);
        return NULL;
    }
    temp = PyNumber_Add(num, one);
    Py_DECREF(one);
    Py_DECREF(num);
    num = temp;
    if (num == NULL)
        return NULL;
    overflow = 0;
    value = PyLong_AsLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != -1)
        return raiseTestError("test_long_and_overflow",
            "return value was not set to -1");
    if (overflow != 1)
        return raiseTestError("test_long_and_overflow",
            "overflow was not set to 1");

    /* Test that overflow is set properly for a large negative value. */
    /* num is a number smaller than LONG_MIN even on 64-bit platforms */
    num = PyLong_FromString("-FFFFFFFFFFFFFFFFFFFFFFFF", NULL, 16);
    if (num == NULL)
        return NULL;
    overflow = 1234;
    value = PyLong_AsLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != -1)
        return raiseTestError("test_long_and_overflow",
            "return value was not set to -1");
    if (overflow != -1)
        return raiseTestError("test_long_and_overflow",
            "overflow was not set to -1");

    /* Same again, with num = LONG_MIN - 1 */
    num = PyLong_FromLong(LONG_MIN);
    if (num == NULL)
        return NULL;
    one = PyLong_FromLong(1L);
    if (one == NULL) {
        Py_DECREF(num);
        return NULL;
    }
    temp = PyNumber_Subtract(num, one);
    Py_DECREF(one);
    Py_DECREF(num);
    num = temp;
    if (num == NULL)
        return NULL;
    overflow = 0;
    value = PyLong_AsLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != -1)
        return raiseTestError("test_long_and_overflow",
            "return value was not set to -1");
    if (overflow != -1)
        return raiseTestError("test_long_and_overflow",
            "overflow was not set to -1");

    /* Test that overflow is cleared properly for small values. */
    num = PyLong_FromString("FF", NULL, 16);
    if (num == NULL)
        return NULL;
    overflow = 1234;
    value = PyLong_AsLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != 0xFF)
        return raiseTestError("test_long_and_overflow",
            "expected return value 0xFF");
    if (overflow != 0)
        return raiseTestError("test_long_and_overflow",
            "overflow was not cleared");

    num = PyLong_FromString("-FF", NULL, 16);
    if (num == NULL)
        return NULL;
    overflow = 0;
    value = PyLong_AsLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != -0xFF)
        return raiseTestError("test_long_and_overflow",
            "expected return value 0xFF");
    if (overflow != 0)
        return raiseTestError("test_long_and_overflow",
            "overflow was set incorrectly");

    num = PyLong_FromLong(LONG_MAX);
    if (num == NULL)
        return NULL;
    overflow = 1234;
    value = PyLong_AsLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != LONG_MAX)
        return raiseTestError("test_long_and_overflow",
            "expected return value LONG_MAX");
    if (overflow != 0)
        return raiseTestError("test_long_and_overflow",
            "overflow was not cleared");

    num = PyLong_FromLong(LONG_MIN);
    if (num == NULL)
        return NULL;
    overflow = 0;
    value = PyLong_AsLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != LONG_MIN)
        return raiseTestError("test_long_and_overflow",
            "expected return value LONG_MIN");
    if (overflow != 0)
        return raiseTestError("test_long_and_overflow",
            "overflow was not cleared");

    Py_RETURN_NONE;
}

/* Test the PyLong_AsLongLongAndOverflow API. General conversion to
   long long is tested by test_long_api_inner. This test will
   concentrate on proper handling of overflow.
*/

static PyObject *
test_long_long_and_overflow(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *num, *one, *temp;
    long long value;
    int overflow;

    /* Test that overflow is set properly for a large value. */
    /* num is a number larger than LLONG_MAX on a typical machine. */
    num = PyLong_FromString("FFFFFFFFFFFFFFFFFFFFFFFF", NULL, 16);
    if (num == NULL)
        return NULL;
    overflow = 1234;
    value = PyLong_AsLongLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != -1)
        return raiseTestError("test_long_long_and_overflow",
            "return value was not set to -1");
    if (overflow != 1)
        return raiseTestError("test_long_long_and_overflow",
            "overflow was not set to 1");

    /* Same again, with num = LLONG_MAX + 1 */
    num = PyLong_FromLongLong(LLONG_MAX);
    if (num == NULL)
        return NULL;
    one = PyLong_FromLong(1L);
    if (one == NULL) {
        Py_DECREF(num);
        return NULL;
    }
    temp = PyNumber_Add(num, one);
    Py_DECREF(one);
    Py_DECREF(num);
    num = temp;
    if (num == NULL)
        return NULL;
    overflow = 0;
    value = PyLong_AsLongLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != -1)
        return raiseTestError("test_long_long_and_overflow",
            "return value was not set to -1");
    if (overflow != 1)
        return raiseTestError("test_long_long_and_overflow",
            "overflow was not set to 1");

    /* Test that overflow is set properly for a large negative value. */
    /* num is a number smaller than LLONG_MIN on a typical platform */
    num = PyLong_FromString("-FFFFFFFFFFFFFFFFFFFFFFFF", NULL, 16);
    if (num == NULL)
        return NULL;
    overflow = 1234;
    value = PyLong_AsLongLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != -1)
        return raiseTestError("test_long_long_and_overflow",
            "return value was not set to -1");
    if (overflow != -1)
        return raiseTestError("test_long_long_and_overflow",
            "overflow was not set to -1");

    /* Same again, with num = LLONG_MIN - 1 */
    num = PyLong_FromLongLong(LLONG_MIN);
    if (num == NULL)
        return NULL;
    one = PyLong_FromLong(1L);
    if (one == NULL) {
        Py_DECREF(num);
        return NULL;
    }
    temp = PyNumber_Subtract(num, one);
    Py_DECREF(one);
    Py_DECREF(num);
    num = temp;
    if (num == NULL)
        return NULL;
    overflow = 0;
    value = PyLong_AsLongLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != -1)
        return raiseTestError("test_long_long_and_overflow",
            "return value was not set to -1");
    if (overflow != -1)
        return raiseTestError("test_long_long_and_overflow",
            "overflow was not set to -1");

    /* Test that overflow is cleared properly for small values. */
    num = PyLong_FromString("FF", NULL, 16);
    if (num == NULL)
        return NULL;
    overflow = 1234;
    value = PyLong_AsLongLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != 0xFF)
        return raiseTestError("test_long_long_and_overflow",
            "expected return value 0xFF");
    if (overflow != 0)
        return raiseTestError("test_long_long_and_overflow",
            "overflow was not cleared");

    num = PyLong_FromString("-FF", NULL, 16);
    if (num == NULL)
        return NULL;
    overflow = 0;
    value = PyLong_AsLongLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != -0xFF)
        return raiseTestError("test_long_long_and_overflow",
            "expected return value 0xFF");
    if (overflow != 0)
        return raiseTestError("test_long_long_and_overflow",
            "overflow was set incorrectly");

    num = PyLong_FromLongLong(LLONG_MAX);
    if (num == NULL)
        return NULL;
    overflow = 1234;
    value = PyLong_AsLongLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != LLONG_MAX)
        return raiseTestError("test_long_long_and_overflow",
            "expected return value LLONG_MAX");
    if (overflow != 0)
        return raiseTestError("test_long_long_and_overflow",
            "overflow was not cleared");

    num = PyLong_FromLongLong(LLONG_MIN);
    if (num == NULL)
        return NULL;
    overflow = 0;
    value = PyLong_AsLongLongAndOverflow(num, &overflow);
    Py_DECREF(num);
    if (value == -1 && PyErr_Occurred())
        return NULL;
    if (value != LLONG_MIN)
        return raiseTestError("test_long_long_and_overflow",
            "expected return value LLONG_MIN");
    if (overflow != 0)
        return raiseTestError("test_long_long_and_overflow",
            "overflow was not cleared");

    Py_RETURN_NONE;
}

/* Test the PyLong_As{Size,Ssize}_t API. At present this just tests that
   non-integer arguments are handled correctly. It should be extended to
   test overflow handling.
 */

static PyObject *
test_long_as_size_t(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    size_t out_u;
    Py_ssize_t out_s;

    Py_INCREF(Py_None);

    out_u = PyLong_AsSize_t(Py_None);
    if (out_u != (size_t)-1 || !PyErr_Occurred())
        return raiseTestError("test_long_as_size_t",
                              "PyLong_AsSize_t(None) didn't complain");
    if (!PyErr_ExceptionMatches(PyExc_TypeError))
        return raiseTestError("test_long_as_size_t",
                              "PyLong_AsSize_t(None) raised "
                              "something other than TypeError");
    PyErr_Clear();

    out_s = PyLong_AsSsize_t(Py_None);
    if (out_s != (Py_ssize_t)-1 || !PyErr_Occurred())
        return raiseTestError("test_long_as_size_t",
                              "PyLong_AsSsize_t(None) didn't complain");
    if (!PyErr_ExceptionMatches(PyExc_TypeError))
        return raiseTestError("test_long_as_size_t",
                              "PyLong_AsSsize_t(None) raised "
                              "something other than TypeError");
    PyErr_Clear();

    /* Py_INCREF(Py_None) omitted - we already have a reference to it. */
    return Py_None;
}

static PyObject *
test_long_as_unsigned_long_long_mask(PyObject *self,
                                     PyObject *Py_UNUSED(ignored))
{
    unsigned long long res = PyLong_AsUnsignedLongLongMask(NULL);

    if (res != (unsigned long long)-1 || !PyErr_Occurred()) {
        return raiseTestError("test_long_as_unsigned_long_long_mask",
                              "PyLong_AsUnsignedLongLongMask(NULL) didn't "
                              "complain");
    }
    if (!PyErr_ExceptionMatches(PyExc_SystemError)) {
        return raiseTestError("test_long_as_unsigned_long_long_mask",
                              "PyLong_AsUnsignedLongLongMask(NULL) raised "
                              "something other than SystemError");
    }
    PyErr_Clear();
    Py_RETURN_NONE;
}

/* Test the PyLong_AsDouble API. At present this just tests that
   non-integer arguments are handled correctly.
 */

static PyObject *
test_long_as_double(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    double out;

    Py_INCREF(Py_None);

    out = PyLong_AsDouble(Py_None);
    if (out != -1.0 || !PyErr_Occurred())
        return raiseTestError("test_long_as_double",
                              "PyLong_AsDouble(None) didn't complain");
    if (!PyErr_ExceptionMatches(PyExc_TypeError))
        return raiseTestError("test_long_as_double",
                              "PyLong_AsDouble(None) raised "
                              "something other than TypeError");
    PyErr_Clear();

    /* Py_INCREF(Py_None) omitted - we already have a reference to it. */
    return Py_None;
}

/* Test the L code for PyArg_ParseTuple.  This should deliver a long long
   for both long and int arguments.  The test may leak a little memory if
   it fails.
*/
static PyObject *
test_L_code(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *tuple, *num;
    long long value;

    tuple = PyTuple_New(1);
    if (tuple == NULL)
        return NULL;

    num = PyLong_FromLong(42);
    if (num == NULL)
        return NULL;

    PyTuple_SET_ITEM(tuple, 0, num);

    value = -1;
    if (!PyArg_ParseTuple(tuple, "L:test_L_code", &value)) {
        return NULL;
    }
    if (value != 42)
        return raiseTestError("test_L_code",
            "L code returned wrong value for long 42");

    Py_DECREF(num);
    num = PyLong_FromLong(42);
    if (num == NULL)
        return NULL;

    PyTuple_SET_ITEM(tuple, 0, num);

    value = -1;
    if (!PyArg_ParseTuple(tuple, "L:test_L_code", &value)) {
        return NULL;
    }
    if (value != 42)
        return raiseTestError("test_L_code",
            "L code returned wrong value for int 42");

    Py_DECREF(tuple);
    Py_RETURN_NONE;
}

static PyObject *
return_none(void *unused)
{
    Py_RETURN_NONE;
}

static PyObject *
raise_error(void *unused)
{
    PyErr_SetNone(PyExc_ValueError);
    return NULL;
}

static int
test_buildvalue_N_error(const char *fmt)
{
    PyObject *arg, *res;

    arg = PyList_New(0);
    if (arg == NULL) {
        return -1;
    }

    Py_INCREF(arg);
    res = Py_BuildValue(fmt, return_none, NULL, arg);
    if (res == NULL) {
        return -1;
    }
    Py_DECREF(res);
    if (Py_REFCNT(arg) != 1) {
        PyErr_Format(TestError, "test_buildvalue_N: "
                     "arg was not decrefed in successful "
                     "Py_BuildValue(\"%s\")", fmt);
        return -1;
    }

    Py_INCREF(arg);
    res = Py_BuildValue(fmt, raise_error, NULL, arg);
    if (res != NULL || !PyErr_Occurred()) {
        PyErr_Format(TestError, "test_buildvalue_N: "
                     "Py_BuildValue(\"%s\") didn't complain", fmt);
        return -1;
    }
    PyErr_Clear();
    if (Py_REFCNT(arg) != 1) {
        PyErr_Format(TestError, "test_buildvalue_N: "
                     "arg was not decrefed in failed "
                     "Py_BuildValue(\"%s\")", fmt);
        return -1;
    }
    Py_DECREF(arg);
    return 0;
}

static PyObject *
test_buildvalue_N(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *arg, *res;

    arg = PyList_New(0);
    if (arg == NULL) {
        return NULL;
    }
    Py_INCREF(arg);
    res = Py_BuildValue("N", arg);
    if (res == NULL) {
        return NULL;
    }
    if (res != arg) {
        return raiseTestError("test_buildvalue_N",
                              "Py_BuildValue(\"N\") returned wrong result");
    }
    if (Py_REFCNT(arg) != 2) {
        return raiseTestError("test_buildvalue_N",
                              "arg was not decrefed in Py_BuildValue(\"N\")");
    }
    Py_DECREF(res);
    Py_DECREF(arg);

    if (test_buildvalue_N_error("O&N") < 0)
        return NULL;
    if (test_buildvalue_N_error("(O&N)") < 0)
        return NULL;
    if (test_buildvalue_N_error("[O&N]") < 0)
        return NULL;
    if (test_buildvalue_N_error("{O&N}") < 0)
        return NULL;
    if (test_buildvalue_N_error("{()O&(())N}") < 0)
        return NULL;

    Py_RETURN_NONE;
}


static PyObject *
test_get_statictype_slots(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    newfunc tp_new = PyType_GetSlot(&PyLong_Type, Py_tp_new);
    if (PyLong_Type.tp_new != tp_new) {
        PyErr_SetString(PyExc_AssertionError, "mismatch: tp_new of long");
        return NULL;
    }

    reprfunc tp_repr = PyType_GetSlot(&PyLong_Type, Py_tp_repr);
    if (PyLong_Type.tp_repr != tp_repr) {
        PyErr_SetString(PyExc_AssertionError, "mismatch: tp_repr of long");
        return NULL;
    }

    ternaryfunc tp_call = PyType_GetSlot(&PyLong_Type, Py_tp_call);
    if (tp_call != NULL) {
        PyErr_SetString(PyExc_AssertionError, "mismatch: tp_call of long");
        return NULL;
    }

    binaryfunc nb_add = PyType_GetSlot(&PyLong_Type, Py_nb_add);
    if (PyLong_Type.tp_as_number->nb_add != nb_add) {
        PyErr_SetString(PyExc_AssertionError, "mismatch: nb_add of long");
        return NULL;
    }

    lenfunc mp_length = PyType_GetSlot(&PyLong_Type, Py_mp_length);
    if (mp_length != NULL) {
        PyErr_SetString(PyExc_AssertionError, "mismatch: mp_length of long");
        return NULL;
    }

    void *over_value = PyType_GetSlot(&PyLong_Type, Py_bf_releasebuffer + 1);
    if (over_value != NULL) {
        PyErr_SetString(PyExc_AssertionError, "mismatch: max+1 of long");
        return NULL;
    }

    tp_new = PyType_GetSlot(&PyLong_Type, 0);
    if (tp_new != NULL) {
        PyErr_SetString(PyExc_AssertionError, "mismatch: slot 0 of long");
        return NULL;
    }
    if (PyErr_ExceptionMatches(PyExc_SystemError)) {
        // This is the right exception
        PyErr_Clear();
    }
    else {
        return NULL;
    }

    Py_RETURN_NONE;
}


static PyObject *
test_get_type_name(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *tp_name = PyType_GetName(&PyLong_Type);
    assert(strcmp(PyUnicode_AsUTF8(tp_name), "int") == 0);
    Py_DECREF(tp_name);

    tp_name = PyType_GetName(&PyModule_Type);
    assert(strcmp(PyUnicode_AsUTF8(tp_name), "module") == 0);
    Py_DECREF(tp_name);

    PyObject *HeapTypeNameType = PyType_FromSpec(&HeapTypeNameType_Spec);
    if (HeapTypeNameType == NULL) {
        Py_RETURN_NONE;
    }
    tp_name = PyType_GetName((PyTypeObject *)HeapTypeNameType);
    assert(strcmp(PyUnicode_AsUTF8(tp_name), "HeapTypeNameType") == 0);
    Py_DECREF(tp_name);

    PyObject *name = PyUnicode_FromString("test_name");
    if (name == NULL) {
        goto done;
    }
    if (PyObject_SetAttrString(HeapTypeNameType, "__name__", name) < 0) {
        Py_DECREF(name);
        goto done;
    }
    tp_name = PyType_GetName((PyTypeObject *)HeapTypeNameType);
    assert(strcmp(PyUnicode_AsUTF8(tp_name), "test_name") == 0);
    Py_DECREF(name);
    Py_DECREF(tp_name);

  done:
    Py_DECREF(HeapTypeNameType);
    Py_RETURN_NONE;
}


static PyObject *
simple_str(PyObject *self) {
    return PyUnicode_FromString("<test>");
}


static PyObject *
test_type_from_ephemeral_spec(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    // Test that a heap type can be created from a spec that's later deleted
    // (along with all its contents).
    // All necessary data must be copied and held by the class
    PyType_Spec *spec = NULL;
    char *name = NULL;
    char *doc = NULL;
    PyType_Slot *slots = NULL;
    PyObject *class = NULL;
    PyObject *instance = NULL;
    PyObject *obj = NULL;
    PyObject *result = NULL;

    /* create a spec (and all its contents) on the heap */

    const char NAME[] = "testcapi._Test";
    const char DOC[] = "a test class";

    spec = PyMem_New(PyType_Spec, 1);
    if (spec == NULL) {
        PyErr_NoMemory();
        goto finally;
    }
    name = PyMem_New(char, sizeof(NAME));
    if (name == NULL) {
        PyErr_NoMemory();
        goto finally;
    }
    memcpy(name, NAME, sizeof(NAME));

    doc = PyMem_New(char, sizeof(DOC));
    if (name == NULL) {
        PyErr_NoMemory();
        goto finally;
    }
    memcpy(doc, DOC, sizeof(DOC));

    spec->name = name;
    spec->basicsize = sizeof(PyObject);
    spec->itemsize = 0;
    spec->flags = Py_TPFLAGS_DEFAULT;
    slots = PyMem_New(PyType_Slot, 3);
    if (slots == NULL) {
        PyErr_NoMemory();
        goto finally;
    }
    slots[0].slot = Py_tp_str;
    slots[0].pfunc = simple_str;
    slots[1].slot = Py_tp_doc;
    slots[1].pfunc = doc;
    slots[2].slot = 0;
    slots[2].pfunc = NULL;
    spec->slots = slots;

    /* create the class */

    class = PyType_FromSpec(spec);
    if (class == NULL) {
        goto finally;
    }

    /* deallocate the spec (and all contents) */

    // (Explicitly ovewrite memory before freeing,
    // so bugs show themselves even without the debug allocator's help.)
    memset(spec, 0xdd, sizeof(PyType_Spec));
    PyMem_Del(spec);
    spec = NULL;
    memset(name, 0xdd, sizeof(NAME));
    PyMem_Del(name);
    name = NULL;
    memset(doc, 0xdd, sizeof(DOC));
    PyMem_Del(doc);
    doc = NULL;
    memset(slots, 0xdd, 3 * sizeof(PyType_Slot));
    PyMem_Del(slots);
    slots = NULL;

    /* check that everything works */

    PyTypeObject *class_tp = (PyTypeObject *)class;
    PyHeapTypeObject *class_ht = (PyHeapTypeObject *)class;
    assert(strcmp(class_tp->tp_name, "testcapi._Test") == 0);
    assert(strcmp(PyUnicode_AsUTF8(class_ht->ht_name), "_Test") == 0);
    assert(strcmp(PyUnicode_AsUTF8(class_ht->ht_qualname), "_Test") == 0);
    assert(strcmp(class_tp->tp_doc, "a test class") == 0);

    // call and check __str__
    instance = PyObject_CallNoArgs(class);
    if (instance == NULL) {
        goto finally;
    }
    obj = PyObject_Str(instance);
    if (obj == NULL) {
        goto finally;
    }
    assert(strcmp(PyUnicode_AsUTF8(obj), "<test>") == 0);
    Py_CLEAR(obj);

    result = Py_NewRef(Py_None);
  finally:
    PyMem_Del(spec);
    PyMem_Del(name);
    PyMem_Del(doc);
    PyMem_Del(slots);
    Py_XDECREF(class);
    Py_XDECREF(instance);
    Py_XDECREF(obj);
    return result;
}


static PyObject *
test_get_type_qualname(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *tp_qualname = PyType_GetQualName(&PyLong_Type);
    assert(strcmp(PyUnicode_AsUTF8(tp_qualname), "int") == 0);
    Py_DECREF(tp_qualname);

    tp_qualname = PyType_GetQualName(&PyODict_Type);
    assert(strcmp(PyUnicode_AsUTF8(tp_qualname), "OrderedDict") == 0);
    Py_DECREF(tp_qualname);

    PyObject *HeapTypeNameType = PyType_FromSpec(&HeapTypeNameType_Spec);
    if (HeapTypeNameType == NULL) {
        Py_RETURN_NONE;
    }
    tp_qualname = PyType_GetQualName((PyTypeObject *)HeapTypeNameType);
    assert(strcmp(PyUnicode_AsUTF8(tp_qualname), "HeapTypeNameType") == 0);
    Py_DECREF(tp_qualname);

    PyObject *spec_name = PyUnicode_FromString(HeapTypeNameType_Spec.name);
    if (spec_name == NULL) {
        goto done;
    }
    if (PyObject_SetAttrString(HeapTypeNameType,
                               "__qualname__", spec_name) < 0) {
        Py_DECREF(spec_name);
        goto done;
    }
    tp_qualname = PyType_GetQualName((PyTypeObject *)HeapTypeNameType);
    assert(strcmp(PyUnicode_AsUTF8(tp_qualname),
                  "_testcapi.HeapTypeNameType") == 0);
    Py_DECREF(spec_name);
    Py_DECREF(tp_qualname);

  done:
    Py_DECREF(HeapTypeNameType);
    Py_RETURN_NONE;
}


static PyObject *
get_args(PyObject *self, PyObject *args)
{
    if (args == NULL) {
        args = Py_None;
    }
    Py_INCREF(args);
    return args;
}

static PyObject *
get_kwargs(PyObject *self, PyObject *args, PyObject *kwargs)
{
    if (kwargs == NULL) {
        kwargs = Py_None;
    }
    Py_INCREF(kwargs);
    return kwargs;
}

/* Test tuple argument processing */
static PyObject *
getargs_tuple(PyObject *self, PyObject *args)
{
    int a, b, c;
    if (!PyArg_ParseTuple(args, "i(ii)", &a, &b, &c))
        return NULL;
    return Py_BuildValue("iii", a, b, c);
}

/* test PyArg_ParseTupleAndKeywords */
static PyObject *
getargs_keywords(PyObject *self, PyObject *args, PyObject *kwargs)
{
    static char *keywords[] = {"arg1","arg2","arg3","arg4","arg5", NULL};
    static const char fmt[] = "(ii)i|(i(ii))(iii)i";
    int int_args[10]={-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};

    if (!PyArg_ParseTupleAndKeywords(args, kwargs, fmt, keywords,
        &int_args[0], &int_args[1], &int_args[2], &int_args[3], &int_args[4],
        &int_args[5], &int_args[6], &int_args[7], &int_args[8], &int_args[9]))
        return NULL;
    return Py_BuildValue("iiiiiiiiii",
        int_args[0], int_args[1], int_args[2], int_args[3], int_args[4],
        int_args[5], int_args[6], int_args[7], int_args[8], int_args[9]);
}

/* test PyArg_ParseTupleAndKeywords keyword-only arguments */
static PyObject *
getargs_keyword_only(PyObject *self, PyObject *args, PyObject *kwargs)
{
    static char *keywords[] = {"required", "optional", "keyword_only", NULL};
    int required = -1;
    int optional = -1;
    int keyword_only = -1;

    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "i|i$i", keywords,
                                     &required, &optional, &keyword_only))
        return NULL;
    return Py_BuildValue("iii", required, optional, keyword_only);
}

/* test PyArg_ParseTupleAndKeywords positional-only arguments */
static PyObject *
getargs_positional_only_and_keywords(PyObject *self, PyObject *args, PyObject *kwargs)
{
    static char *keywords[] = {"", "", "keyword", NULL};
    int required = -1;
    int optional = -1;
    int keyword = -1;

    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "i|ii", keywords,
                                     &required, &optional, &keyword))
        return NULL;
    return Py_BuildValue("iii", required, optional, keyword);
}

/* Functions to call PyArg_ParseTuple with integer format codes,
   and return the result.
*/
static PyObject *
getargs_b(PyObject *self, PyObject *args)
{
    unsigned char value;
    if (!PyArg_ParseTuple(args, "b", &value))
        return NULL;
    return PyLong_FromUnsignedLong((unsigned long)value);
}

static PyObject *
getargs_B(PyObject *self, PyObject *args)
{
    unsigned char value;
    if (!PyArg_ParseTuple(args, "B", &value))
        return NULL;
    return PyLong_FromUnsignedLong((unsigned long)value);
}

static PyObject *
getargs_h(PyObject *self, PyObject *args)
{
    short value;
    if (!PyArg_ParseTuple(args, "h", &value))
        return NULL;
    return PyLong_FromLong((long)value);
}

static PyObject *
getargs_H(PyObject *self, PyObject *args)
{
    unsigned short value;
    if (!PyArg_ParseTuple(args, "H", &value))
        return NULL;
    return PyLong_FromUnsignedLong((unsigned long)value);
}

static PyObject *
getargs_I(PyObject *self, PyObject *args)
{
    unsigned int value;
    if (!PyArg_ParseTuple(args, "I", &value))
        return NULL;
    return PyLong_FromUnsignedLong((unsigned long)value);
}

static PyObject *
getargs_k(PyObject *self, PyObject *args)
{
    unsigned long value;
    if (!PyArg_ParseTuple(args, "k", &value))
        return NULL;
    return PyLong_FromUnsignedLong(value);
}

static PyObject *
getargs_i(PyObject *self, PyObject *args)
{
    int value;
    if (!PyArg_ParseTuple(args, "i", &value))
        return NULL;
    return PyLong_FromLong((long)value);
}

static PyObject *
getargs_l(PyObject *self, PyObject *args)
{
    long value;
    if (!PyArg_ParseTuple(args, "l", &value))
        return NULL;
    return PyLong_FromLong(value);
}

static PyObject *
getargs_n(PyObject *self, PyObject *args)
{
    Py_ssize_t value;
    if (!PyArg_ParseTuple(args, "n", &value))
        return NULL;
    return PyLong_FromSsize_t(value);
}

static PyObject *
getargs_p(PyObject *self, PyObject *args)
{
    int value;
    if (!PyArg_ParseTuple(args, "p", &value))
        return NULL;
    return PyLong_FromLong(value);
}

static PyObject *
getargs_L(PyObject *self, PyObject *args)
{
    long long value;
    if (!PyArg_ParseTuple(args, "L", &value))
        return NULL;
    return PyLong_FromLongLong(value);
}

static PyObject *
getargs_K(PyObject *self, PyObject *args)
{
    unsigned long long value;
    if (!PyArg_ParseTuple(args, "K", &value))
        return NULL;
    return PyLong_FromUnsignedLongLong(value);
}

/* This function not only tests the 'k' getargs code, but also the
   PyLong_AsUnsignedLongMask() function. */
static PyObject *
test_k_code(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *tuple, *num;
    unsigned long value;

    tuple = PyTuple_New(1);
    if (tuple == NULL)
        return NULL;

    /* a number larger than ULONG_MAX even on 64-bit platforms */
    num = PyLong_FromString("FFFFFFFFFFFFFFFFFFFFFFFF", NULL, 16);
    if (num == NULL)
        return NULL;

    value = PyLong_AsUnsignedLongMask(num);
    if (value != ULONG_MAX)
        return raiseTestError("test_k_code",
            "PyLong_AsUnsignedLongMask() returned wrong value for long 0xFFF...FFF");

    PyTuple_SET_ITEM(tuple, 0, num);

    value = 0;
    if (!PyArg_ParseTuple(tuple, "k:test_k_code", &value)) {
        return NULL;
    }
    if (value != ULONG_MAX)
        return raiseTestError("test_k_code",
            "k code returned wrong value for long 0xFFF...FFF");

    Py_DECREF(num);
    num = PyLong_FromString("-FFFFFFFF000000000000000042", NULL, 16);
    if (num == NULL)
        return NULL;

    value = PyLong_AsUnsignedLongMask(num);
    if (value != (unsigned long)-0x42)
        return raiseTestError("test_k_code",
                              "PyLong_AsUnsignedLongMask() returned wrong "
                              "value for long -0xFFF..000042");

    PyTuple_SET_ITEM(tuple, 0, num);

    value = 0;
    if (!PyArg_ParseTuple(tuple, "k:test_k_code", &value)) {
        return NULL;
    }
    if (value != (unsigned long)-0x42)
        return raiseTestError("test_k_code",
            "k code returned wrong value for long -0xFFF..000042");

    Py_DECREF(tuple);
    Py_RETURN_NONE;
}

static PyObject *
getargs_f(PyObject *self, PyObject *args)
{
    float f;
    if (!PyArg_ParseTuple(args, "f", &f))
        return NULL;
    return PyFloat_FromDouble(f);
}

static PyObject *
getargs_d(PyObject *self, PyObject *args)
{
    double d;
    if (!PyArg_ParseTuple(args, "d", &d))
        return NULL;
    return PyFloat_FromDouble(d);
}

static PyObject *
getargs_D(PyObject *self, PyObject *args)
{
    Py_complex cval;
    if (!PyArg_ParseTuple(args, "D", &cval))
        return NULL;
    return PyComplex_FromCComplex(cval);
}

static PyObject *
getargs_S(PyObject *self, PyObject *args)
{
    PyObject *obj;
    if (!PyArg_ParseTuple(args, "S", &obj))
        return NULL;
    Py_INCREF(obj);
    return obj;
}

static PyObject *
getargs_Y(PyObject *self, PyObject *args)
{
    PyObject *obj;
    if (!PyArg_ParseTuple(args, "Y", &obj))
        return NULL;
    Py_INCREF(obj);
    return obj;
}

static PyObject *
getargs_U(PyObject *self, PyObject *args)
{
    PyObject *obj;
    if (!PyArg_ParseTuple(args, "U", &obj))
        return NULL;
    Py_INCREF(obj);
    return obj;
}

static PyObject *
getargs_c(PyObject *self, PyObject *args)
{
    char c;
    if (!PyArg_ParseTuple(args, "c", &c))
        return NULL;
    return PyLong_FromLong((unsigned char)c);
}

static PyObject *
getargs_C(PyObject *self, PyObject *args)
{
    int c;
    if (!PyArg_ParseTuple(args, "C", &c))
        return NULL;
    return PyLong_FromLong(c);
}

static PyObject *
getargs_s(PyObject *self, PyObject *args)
{
    char *str;
    if (!PyArg_ParseTuple(args, "s", &str))
        return NULL;
    return PyBytes_FromString(str);
}

static PyObject *
getargs_s_star(PyObject *self, PyObject *args)
{
    Py_buffer buffer;
    PyObject *bytes;
    if (!PyArg_ParseTuple(args, "s*", &buffer))
        return NULL;
    bytes = PyBytes_FromStringAndSize(buffer.buf, buffer.len);
    PyBuffer_Release(&buffer);
    return bytes;
}

static PyObject *
getargs_s_hash(PyObject *self, PyObject *args)
{
    char *str;
    Py_ssize_t size;
    if (!PyArg_ParseTuple(args, "s#", &str, &size))
        return NULL;
    return PyBytes_FromStringAndSize(str, size);
}

static PyObject *
getargs_z(PyObject *self, PyObject *args)
{
    char *str;
    if (!PyArg_ParseTuple(args, "z", &str))
        return NULL;
    if (str != NULL)
        return PyBytes_FromString(str);
    else
        Py_RETURN_NONE;
}

static PyObject *
getargs_z_star(PyObject *self, PyObject *args)
{
    Py_buffer buffer;
    PyObject *bytes;
    if (!PyArg_ParseTuple(args, "z*", &buffer))
        return NULL;
    if (buffer.buf != NULL)
        bytes = PyBytes_FromStringAndSize(buffer.buf, buffer.len);
    else {
        Py_INCREF(Py_None);
        bytes = Py_None;
    }
    PyBuffer_Release(&buffer);
    return bytes;
}

static PyObject *
getargs_z_hash(PyObject *self, PyObject *args)
{
    char *str;
    Py_ssize_t size;
    if (!PyArg_ParseTuple(args, "z#", &str, &size))
        return NULL;
    if (str != NULL)
        return PyBytes_FromStringAndSize(str, size);
    else
        Py_RETURN_NONE;
}

static PyObject *
getargs_y(PyObject *self, PyObject *args)
{
    char *str;
    if (!PyArg_ParseTuple(args, "y", &str))
        return NULL;
    return PyBytes_FromString(str);
}

static PyObject *
getargs_y_star(PyObject *self, PyObject *args)
{
    Py_buffer buffer;
    PyObject *bytes;
    if (!PyArg_ParseTuple(args, "y*", &buffer))
        return NULL;
    bytes = PyBytes_FromStringAndSize(buffer.buf, buffer.len);
    PyBuffer_Release(&buffer);
    return bytes;
}

static PyObject *
getargs_y_hash(PyObject *self, PyObject *args)
{
    char *str;
    Py_ssize_t size;
    if (!PyArg_ParseTuple(args, "y#", &str, &size))
        return NULL;
    return PyBytes_FromStringAndSize(str, size);
}

static PyObject *
getargs_u(PyObject *self, PyObject *args)
{
    Py_UNICODE *str;
    if (!PyArg_ParseTuple(args, "u", &str))
        return NULL;
    return PyUnicode_FromWideChar(str, -1);
}

static PyObject *
getargs_u_hash(PyObject *self, PyObject *args)
{
    Py_UNICODE *str;
    Py_ssize_t size;
    if (!PyArg_ParseTuple(args, "u#", &str, &size))
        return NULL;
    return PyUnicode_FromWideChar(str, size);
}

static PyObject *
getargs_Z(PyObject *self, PyObject *args)
{
    Py_UNICODE *str;
    if (!PyArg_ParseTuple(args, "Z", &str))
        return NULL;
    if (str != NULL) {
        return PyUnicode_FromWideChar(str, -1);
    } else
        Py_RETURN_NONE;
}

static PyObject *
getargs_Z_hash(PyObject *self, PyObject *args)
{
    Py_UNICODE *str;
    Py_ssize_t size;
    if (!PyArg_ParseTuple(args, "Z#", &str, &size))
        return NULL;
    if (str != NULL)
        return PyUnicode_FromWideChar(str, size);
    else
        Py_RETURN_NONE;
}

static PyObject *
getargs_es(PyObject *self, PyObject *args)
{
    PyObject *arg, *result;
    const char *encoding = NULL;
    char *str;

    if (!PyArg_ParseTuple(args, "O|s", &arg, &encoding))
        return NULL;
    if (!PyArg_Parse(arg, "es", encoding, &str))
        return NULL;
    result = PyBytes_FromString(str);
    PyMem_Free(str);
    return result;
}

static PyObject *
getargs_et(PyObject *self, PyObject *args)
{
    PyObject *arg, *result;
    const char *encoding = NULL;
    char *str;

    if (!PyArg_ParseTuple(args, "O|s", &arg, &encoding))
        return NULL;
    if (!PyArg_Parse(arg, "et", encoding, &str))
        return NULL;
    result = PyBytes_FromString(str);
    PyMem_Free(str);
    return result;
}

static PyObject *
getargs_es_hash(PyObject *self, PyObject *args)
{
    PyObject *arg, *result;
    const char *encoding = NULL;
    PyByteArrayObject *buffer = NULL;
    char *str = NULL;
    Py_ssize_t size;

    if (!PyArg_ParseTuple(args, "O|sY", &arg, &encoding, &buffer))
        return NULL;
    if (buffer != NULL) {
        str = PyByteArray_AS_STRING(buffer);
        size = PyByteArray_GET_SIZE(buffer);
    }
    if (!PyArg_Parse(arg, "es#", encoding, &str, &size))
        return NULL;
    result = PyBytes_FromStringAndSize(str, size);
    if (buffer == NULL)
        PyMem_Free(str);
    return result;
}

static PyObject *
getargs_et_hash(PyObject *self, PyObject *args)
{
    PyObject *arg, *result;
    const char *encoding = NULL;
    PyByteArrayObject *buffer = NULL;
    char *str = NULL;
    Py_ssize_t size;

    if (!PyArg_ParseTuple(args, "O|sY", &arg, &encoding, &buffer))
        return NULL;
    if (buffer != NULL) {
        str = PyByteArray_AS_STRING(buffer);
        size = PyByteArray_GET_SIZE(buffer);
    }
    if (!PyArg_Parse(arg, "et#", encoding, &str, &size))
        return NULL;
    result = PyBytes_FromStringAndSize(str, size);
    if (buffer == NULL)
        PyMem_Free(str);
    return result;
}

/* Test the s and z codes for PyArg_ParseTuple.
*/
static PyObject *
test_s_code(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    /* Unicode strings should be accepted */
    PyObject *tuple, *obj;
    char *value;

    tuple = PyTuple_New(1);
    if (tuple == NULL)
    return NULL;

    obj = PyUnicode_Decode("t\xeate", strlen("t\xeate"),
                           "latin-1", NULL);
    if (obj == NULL)
    return NULL;

    PyTuple_SET_ITEM(tuple, 0, obj);

    /* These two blocks used to raise a TypeError:
     * "argument must be string without null bytes, not str"
     */
    if (!PyArg_ParseTuple(tuple, "s:test_s_code1", &value)) {
        return NULL;
    }

    if (!PyArg_ParseTuple(tuple, "z:test_s_code2", &value)) {
        return NULL;
    }

    Py_DECREF(tuple);
    Py_RETURN_NONE;
}

static PyObject *
parse_tuple_and_keywords(PyObject *self, PyObject *args)
{
    PyObject *sub_args;
    PyObject *sub_kwargs;
    const char *sub_format;
    PyObject *sub_keywords;

    Py_ssize_t i, size;
    char *keywords[8 + 1]; /* space for NULL at end */
    PyObject *o;
    PyObject *converted[8];

    int result;
    PyObject *return_value = NULL;

    double buffers[8][4]; /* double ensures alignment where necessary */

    if (!PyArg_ParseTuple(args, "OOsO:parse_tuple_and_keywords",
        &sub_args, &sub_kwargs,
        &sub_format, &sub_keywords))
        return NULL;

    if (!(PyList_CheckExact(sub_keywords) || PyTuple_CheckExact(sub_keywords))) {
        PyErr_SetString(PyExc_ValueError,
            "parse_tuple_and_keywords: sub_keywords must be either list or tuple");
        return NULL;
    }

    memset(buffers, 0, sizeof(buffers));
    memset(converted, 0, sizeof(converted));
    memset(keywords, 0, sizeof(keywords));

    size = PySequence_Fast_GET_SIZE(sub_keywords);
    if (size > 8) {
        PyErr_SetString(PyExc_ValueError,
            "parse_tuple_and_keywords: too many keywords in sub_keywords");
        goto exit;
    }

    for (i = 0; i < size; i++) {
        o = PySequence_Fast_GET_ITEM(sub_keywords, i);
        if (!PyUnicode_FSConverter(o, (void *)(converted + i))) {
            PyErr_Format(PyExc_ValueError,
                "parse_tuple_and_keywords: could not convert keywords[%zd] to narrow string", i);
            goto exit;
        }
        keywords[i] = PyBytes_AS_STRING(converted[i]);
    }

    result = PyArg_ParseTupleAndKeywords(sub_args, sub_kwargs,
        sub_format, keywords,
        buffers + 0, buffers + 1, buffers + 2, buffers + 3,
        buffers + 4, buffers + 5, buffers + 6, buffers + 7);

    if (result) {
        return_value = Py_None;
        Py_INCREF(Py_None);
    }

exit:
    size = sizeof(converted) / sizeof(converted[0]);
    for (i = 0; i < size; i++) {
        Py_XDECREF(converted[i]);
    }
    return return_value;
}

static volatile int x;

#if USE_UNICODE_WCHAR_CACHE
/* Ignore use of deprecated APIs */
_Py_COMP_DIAG_PUSH
_Py_COMP_DIAG_IGNORE_DEPR_DECLS

/* Test the u and u# codes for PyArg_ParseTuple. May leak memory in case
   of an error.
*/
static PyObject *
test_u_code(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *tuple, *obj;
    Py_UNICODE *value;
    Py_ssize_t len;

    /* issue4122: Undefined reference to _Py_ascii_whitespace on Windows */
    /* Just use the macro and check that it compiles */
    x = Py_UNICODE_ISSPACE(25);

    tuple = PyTuple_New(1);
    if (tuple == NULL)
        return NULL;

    obj = PyUnicode_Decode("test", strlen("test"),
                           "ascii", NULL);
    if (obj == NULL)
        return NULL;

    PyTuple_SET_ITEM(tuple, 0, obj);

    value = 0;
    if (!PyArg_ParseTuple(tuple, "u:test_u_code", &value)) {
        return NULL;
    }
    if (value != PyUnicode_AS_UNICODE(obj))
        return raiseTestError("test_u_code",
            "u code returned wrong value for u'test'");
    value = 0;
    if (!PyArg_ParseTuple(tuple, "u#:test_u_code", &value, &len)) {
        return NULL;
    }
    if (value != PyUnicode_AS_UNICODE(obj) ||
        len != PyUnicode_GET_SIZE(obj))
        return raiseTestError("test_u_code",
            "u# code returned wrong values for u'test'");

    Py_DECREF(tuple);
    Py_RETURN_NONE;
}

/* Test Z and Z# codes for PyArg_ParseTuple */
static PyObject *
test_Z_code(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *tuple, *obj;
    const Py_UNICODE *value1, *value2;
    Py_ssize_t len1, len2;

    tuple = PyTuple_New(2);
    if (tuple == NULL)
        return NULL;

    obj = PyUnicode_FromString("test");
    PyTuple_SET_ITEM(tuple, 0, obj);
    Py_INCREF(Py_None);
    PyTuple_SET_ITEM(tuple, 1, Py_None);

    /* swap values on purpose */
    value1 = NULL;
    value2 = PyUnicode_AS_UNICODE(obj);

    /* Test Z for both values */
    if (!PyArg_ParseTuple(tuple, "ZZ:test_Z_code", &value1, &value2)) {
        return NULL;
    }
    if (value1 != PyUnicode_AS_UNICODE(obj))
        return raiseTestError("test_Z_code",
            "Z code returned wrong value for 'test'");
    if (value2 != NULL)
        return raiseTestError("test_Z_code",
            "Z code returned wrong value for None");

    value1 = NULL;
    value2 = PyUnicode_AS_UNICODE(obj);
    len1 = -1;
    len2 = -1;

    /* Test Z# for both values */
    if (!PyArg_ParseTuple(tuple, "Z#Z#:test_Z_code", &value1, &len1,
                          &value2, &len2))
    {
        return NULL;
    }
    if (value1 != PyUnicode_AS_UNICODE(obj) ||
        len1 != PyUnicode_GET_SIZE(obj))
        return raiseTestError("test_Z_code",
            "Z# code returned wrong values for 'test'");
    if (value2 != NULL ||
        len2 != 0)
        return raiseTestError("test_Z_code",
            "Z# code returned wrong values for None'");

    Py_DECREF(tuple);
    Py_RETURN_NONE;
}
_Py_COMP_DIAG_POP
#endif /* USE_UNICODE_WCHAR_CACHE */

static PyObject *
test_widechar(PyObject *self, PyObject *Py_UNUSED(ignored))
{
#if defined(SIZEOF_WCHAR_T) && (SIZEOF_WCHAR_T == 4)
    const wchar_t wtext[2] = {(wchar_t)0x10ABCDu};
    size_t wtextlen = 1;
    const wchar_t invalid[1] = {(wchar_t)0x110000u};
#else
    const wchar_t wtext[3] = {(wchar_t)0xDBEAu, (wchar_t)0xDFCDu};
    size_t wtextlen = 2;
#endif
    PyObject *wide, *utf8;

    wide = PyUnicode_FromWideChar(wtext, wtextlen);
    if (wide == NULL)
        return NULL;

    utf8 = PyUnicode_FromString("\xf4\x8a\xaf\x8d");
    if (utf8 == NULL) {
        Py_DECREF(wide);
        return NULL;
    }

    if (PyUnicode_GET_LENGTH(wide) != PyUnicode_GET_LENGTH(utf8)) {
        Py_DECREF(wide);
        Py_DECREF(utf8);
        return raiseTestError("test_widechar",
                              "wide string and utf8 string "
                              "have different length");
    }
    if (PyUnicode_Compare(wide, utf8)) {
        Py_DECREF(wide);
        Py_DECREF(utf8);
        if (PyErr_Occurred())
            return NULL;
        return raiseTestError("test_widechar",
                              "wide string and utf8 string "
                              "are different");
    }

    Py_DECREF(wide);
    Py_DECREF(utf8);

#if defined(SIZEOF_WCHAR_T) && (SIZEOF_WCHAR_T == 4)
    wide = PyUnicode_FromWideChar(invalid, 1);
    if (wide == NULL)
        PyErr_Clear();
    else
        return raiseTestError("test_widechar",
                              "PyUnicode_FromWideChar(L\"\\U00110000\", 1) didn't fail");

#if USE_UNICODE_WCHAR_CACHE
/* Ignore use of deprecated APIs */
_Py_COMP_DIAG_PUSH
_Py_COMP_DIAG_IGNORE_DEPR_DECLS
    wide = PyUnicode_FromUnicode(invalid, 1);
    if (wide == NULL)
        PyErr_Clear();
    else
        return raiseTestError("test_widechar",
                              "PyUnicode_FromUnicode(L\"\\U00110000\", 1) didn't fail");

    wide = PyUnicode_FromUnicode(NULL, 1);
    if (wide == NULL)
        return NULL;
    PyUnicode_AS_UNICODE(wide)[0] = invalid[0];
    if (_PyUnicode_Ready(wide) < 0) {
        Py_DECREF(wide);
        PyErr_Clear();
    }
    else {
        Py_DECREF(wide);
        return raiseTestError("test_widechar",
                              "PyUnicode_Ready() didn't fail");
    }
_Py_COMP_DIAG_POP
#endif /* USE_UNICODE_WCHAR_CACHE */
#endif

    Py_RETURN_NONE;
}

static PyObject *
unicode_aswidechar(PyObject *self, PyObject *args)
{
    PyObject *unicode, *result;
    Py_ssize_t buflen, size;
    wchar_t *buffer;

    if (!PyArg_ParseTuple(args, "Un", &unicode, &buflen))
        return NULL;
    buffer = PyMem_New(wchar_t, buflen);
    if (buffer == NULL)
        return PyErr_NoMemory();

    size = PyUnicode_AsWideChar(unicode, buffer, buflen);
    if (size == -1) {
        PyMem_Free(buffer);
        return NULL;
    }

    if (size < buflen)
        buflen = size + 1;
    else
        buflen = size;
    result = PyUnicode_FromWideChar(buffer, buflen);
    PyMem_Free(buffer);
    if (result == NULL)
        return NULL;

    return Py_BuildValue("(Nn)", result, size);
}

static PyObject *
unicode_aswidecharstring(PyObject *self, PyObject *args)
{
    PyObject *unicode, *result;
    Py_ssize_t size;
    wchar_t *buffer;

    if (!PyArg_ParseTuple(args, "U", &unicode))
        return NULL;

    buffer = PyUnicode_AsWideCharString(unicode, &size);
    if (buffer == NULL)
        return NULL;

    result = PyUnicode_FromWideChar(buffer, size + 1);
    PyMem_Free(buffer);
    if (result == NULL)
        return NULL;
    return Py_BuildValue("(Nn)", result, size);
}

static PyObject *
unicode_asucs4(PyObject *self, PyObject *args)
{
    PyObject *unicode, *result;
    Py_UCS4 *buffer;
    int copy_null;
    Py_ssize_t str_len, buf_len;

    if (!PyArg_ParseTuple(args, "Unp:unicode_asucs4", &unicode, &str_len, &copy_null)) {
        return NULL;
    }

    buf_len = str_len + 1;
    buffer = PyMem_NEW(Py_UCS4, buf_len);
    if (buffer == NULL) {
        return PyErr_NoMemory();
    }
    memset(buffer, 0, sizeof(Py_UCS4)*buf_len);
    buffer[str_len] = 0xffffU;

    if (!PyUnicode_AsUCS4(unicode, buffer, buf_len, copy_null)) {
        PyMem_Free(buffer);
        return NULL;
    }

    result = PyUnicode_FromKindAndData(PyUnicode_4BYTE_KIND, buffer, buf_len);
    PyMem_Free(buffer);
    return result;
}

static PyObject *
unicode_asutf8(PyObject *self, PyObject *args)
{
    PyObject *unicode;
    const char *buffer;

    if (!PyArg_ParseTuple(args, "U", &unicode)) {
        return NULL;
    }

    buffer = PyUnicode_AsUTF8(unicode);
    if (buffer == NULL) {
        return NULL;
    }

    return PyBytes_FromString(buffer);
}

static PyObject *
unicode_asutf8andsize(PyObject *self, PyObject *args)
{
    PyObject *unicode, *result;
    const char *buffer;
    Py_ssize_t utf8_len;

    if(!PyArg_ParseTuple(args, "U", &unicode)) {
        return NULL;
    }

    buffer = PyUnicode_AsUTF8AndSize(unicode, &utf8_len);
    if (buffer == NULL) {
        return NULL;
    }

    result = PyBytes_FromString(buffer);
    if (result == NULL) {
        return NULL;
    }

    return Py_BuildValue("(Nn)", result, utf8_len);
}

static PyObject *
unicode_findchar(PyObject *self, PyObject *args)
{
    PyObject *str;
    int direction;
    unsigned int ch;
    Py_ssize_t result;
    Py_ssize_t start, end;

    if (!PyArg_ParseTuple(args, "UInni:unicode_findchar", &str, &ch,
                          &start, &end, &direction)) {
        return NULL;
    }

    result = PyUnicode_FindChar(str, (Py_UCS4)ch, start, end, direction);
    if (result == -2)
        return NULL;
    else
        return PyLong_FromSsize_t(result);
}

static PyObject *
unicode_copycharacters(PyObject *self, PyObject *args)
{
    PyObject *from, *to, *to_copy;
    Py_ssize_t from_start, to_start, how_many, copied;

    if (!PyArg_ParseTuple(args, "UnOnn:unicode_copycharacters", &to, &to_start,
                          &from, &from_start, &how_many)) {
        return NULL;
    }

    if (!(to_copy = PyUnicode_New(PyUnicode_GET_LENGTH(to),
                                  PyUnicode_MAX_CHAR_VALUE(to)))) {
        return NULL;
    }
    if (PyUnicode_Fill(to_copy, 0, PyUnicode_GET_LENGTH(to_copy), 0U) < 0) {
        Py_DECREF(to_copy);
        return NULL;
    }

    if ((copied = PyUnicode_CopyCharacters(to_copy, to_start, from,
                                           from_start, how_many)) < 0) {
        Py_DECREF(to_copy);
        return NULL;
    }

    return Py_BuildValue("(Nn)", to_copy, copied);
}

#if USE_UNICODE_WCHAR_CACHE
/* Ignore use of deprecated APIs */
_Py_COMP_DIAG_PUSH
_Py_COMP_DIAG_IGNORE_DEPR_DECLS

static PyObject *
unicode_legacy_string(PyObject *self, PyObject *args)
{
    Py_UNICODE *data;
    Py_ssize_t len;
    PyObject *u;

    if (!PyArg_ParseTuple(args, "u#", &data, &len))
        return NULL;

    u = PyUnicode_FromUnicode(NULL, len);
    if (u == NULL)
        return NULL;

    memcpy(PyUnicode_AS_UNICODE(u), data, len * sizeof(Py_UNICODE));

    if (len > 0) { /* The empty string is always ready. */
        assert(!PyUnicode_IS_READY(u));
    }

    return u;
}
_Py_COMP_DIAG_POP
#endif /* USE_UNICODE_WCHAR_CACHE */

static PyObject *
getargs_w_star(PyObject *self, PyObject *args)
{
    Py_buffer buffer;
    PyObject *result;
    char *str;

    if (!PyArg_ParseTuple(args, "w*:getargs_w_star", &buffer))
        return NULL;

    if (2 <= buffer.len) {
        str = buffer.buf;
        str[0] = '[';
        str[buffer.len-1] = ']';
    }

    result = PyBytes_FromStringAndSize(buffer.buf, buffer.len);
    PyBuffer_Release(&buffer);
    return result;
}


static PyObject *
test_empty_argparse(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    /* Test that formats can begin with '|'. See issue #4720. */
    PyObject *tuple, *dict = NULL;
    static char *kwlist[] = {NULL};
    int result;
    tuple = PyTuple_New(0);
    if (!tuple)
        return NULL;
    if (!(result = PyArg_ParseTuple(tuple, "|:test_empty_argparse"))) {
        goto done;
    }
    dict = PyDict_New();
    if (!dict)
        goto done;
    result = PyArg_ParseTupleAndKeywords(tuple, dict, "|:test_empty_argparse", kwlist);
  done:
    Py_DECREF(tuple);
    Py_XDECREF(dict);
    if (!result) {
        return NULL;
    }
    else {
        Py_RETURN_NONE;
    }
}

static PyObject *
codec_incrementalencoder(PyObject *self, PyObject *args)
{
    const char *encoding, *errors = NULL;
    if (!PyArg_ParseTuple(args, "s|s:test_incrementalencoder",
                          &encoding, &errors))
        return NULL;
    return PyCodec_IncrementalEncoder(encoding, errors);
}

static PyObject *
codec_incrementaldecoder(PyObject *self, PyObject *args)
{
    const char *encoding, *errors = NULL;
    if (!PyArg_ParseTuple(args, "s|s:test_incrementaldecoder",
                          &encoding, &errors))
        return NULL;
    return PyCodec_IncrementalDecoder(encoding, errors);
}


/* Simple test of _PyLong_NumBits and _PyLong_Sign. */
static PyObject *
test_long_numbits(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    struct triple {
        long input;
        size_t nbits;
        int sign;
    } testcases[] = {{0, 0, 0},
                     {1L, 1, 1},
                     {-1L, 1, -1},
                     {2L, 2, 1},
                     {-2L, 2, -1},
                     {3L, 2, 1},
                     {-3L, 2, -1},
                     {4L, 3, 1},
                     {-4L, 3, -1},
                     {0x7fffL, 15, 1},          /* one Python int digit */
             {-0x7fffL, 15, -1},
             {0xffffL, 16, 1},
             {-0xffffL, 16, -1},
             {0xfffffffL, 28, 1},
             {-0xfffffffL, 28, -1}};
    size_t i;

    for (i = 0; i < Py_ARRAY_LENGTH(testcases); ++i) {
        size_t nbits;
        int sign;
        PyObject *plong;

        plong = PyLong_FromLong(testcases[i].input);
        if (plong == NULL)
            return NULL;
        nbits = _PyLong_NumBits(plong);
        sign = _PyLong_Sign(plong);

        Py_DECREF(plong);
        if (nbits != testcases[i].nbits)
            return raiseTestError("test_long_numbits",
                            "wrong result for _PyLong_NumBits");
        if (sign != testcases[i].sign)
            return raiseTestError("test_long_numbits",
                            "wrong result for _PyLong_Sign");
    }
    Py_RETURN_NONE;
}

static PyObject *
pyobject_repr_from_null(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    return PyObject_Repr(NULL);
}

static PyObject *
pyobject_str_from_null(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    return PyObject_Str(NULL);
}

static PyObject *
pyobject_bytes_from_null(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    return PyObject_Bytes(NULL);
}

static PyObject *
raise_exception(PyObject *self, PyObject *args)
{
    PyObject *exc;
    PyObject *exc_args, *v;
    int num_args, i;

    if (!PyArg_ParseTuple(args, "Oi:raise_exception",
                          &exc, &num_args))
        return NULL;

    exc_args = PyTuple_New(num_args);
    if (exc_args == NULL)
        return NULL;
    for (i = 0; i < num_args; ++i) {
        v = PyLong_FromLong(i);
        if (v == NULL) {
            Py_DECREF(exc_args);
            return NULL;
        }
        PyTuple_SET_ITEM(exc_args, i, v);
    }
    PyErr_SetObject(exc, exc_args);
    Py_DECREF(exc_args);
    return NULL;
}

static PyObject *
set_errno(PyObject *self, PyObject *args)
{
    int new_errno;

    if (!PyArg_ParseTuple(args, "i:set_errno", &new_errno))
        return NULL;

    errno = new_errno;
    Py_RETURN_NONE;
}

static PyObject *
test_set_exc_info(PyObject *self, PyObject *args)
{
    PyObject *orig_exc;
    PyObject *new_type, *new_value, *new_tb;
    PyObject *type, *value, *tb;
    if (!PyArg_ParseTuple(args, "OOO:test_set_exc_info",
                          &new_type, &new_value, &new_tb))
        return NULL;

    PyErr_GetExcInfo(&type, &value, &tb);

    Py_INCREF(new_type);
    Py_INCREF(new_value);
    Py_INCREF(new_tb);
    PyErr_SetExcInfo(new_type, new_value, new_tb);

    orig_exc = PyTuple_Pack(3, type ? type : Py_None, value ? value : Py_None, tb ? tb : Py_None);
    Py_XDECREF(type);
    Py_XDECREF(value);
    Py_XDECREF(tb);
    return orig_exc;
}

static int test_run_counter = 0;

static PyObject *
test_datetime_capi(PyObject *self, PyObject *args) {
    if (PyDateTimeAPI) {
        if (test_run_counter) {
            /* Probably regrtest.py -R */
            Py_RETURN_NONE;
        }
        else {
            PyErr_SetString(PyExc_AssertionError,
                            "PyDateTime_CAPI somehow initialized");
            return NULL;
        }
    }
    test_run_counter++;
    PyDateTime_IMPORT;

    if (PyDateTimeAPI)
        Py_RETURN_NONE;
    else
        return NULL;
}

/* Functions exposing the C API type checking for testing */
#define MAKE_DATETIME_CHECK_FUNC(check_method, exact_method)    \
    PyObject *obj;                                              \
    int exact = 0;                                              \
    if (!PyArg_ParseTuple(args, "O|p", &obj, &exact)) {         \
        return NULL;                                            \
    }                                                           \
    int rv = exact?exact_method(obj):check_method(obj);         \
    if (rv) {                                                   \
        Py_RETURN_TRUE;                                         \
    } else {                                                    \
        Py_RETURN_FALSE;                                        \
    }

static PyObject *
datetime_check_date(PyObject *self, PyObject *args) {
    MAKE_DATETIME_CHECK_FUNC(PyDate_Check, PyDate_CheckExact)
}

static PyObject *
datetime_check_time(PyObject *self, PyObject *args) {
    MAKE_DATETIME_CHECK_FUNC(PyTime_Check, PyTime_CheckExact)
}

static PyObject *
datetime_check_datetime(PyObject *self, PyObject *args) {
    MAKE_DATETIME_CHECK_FUNC(PyDateTime_Check, PyDateTime_CheckExact)
}

static PyObject *
datetime_check_delta(PyObject *self, PyObject *args) {
    MAKE_DATETIME_CHECK_FUNC(PyDelta_Check, PyDelta_CheckExact)
}

static PyObject *
datetime_check_tzinfo(PyObject *self, PyObject *args) {
    MAKE_DATETIME_CHECK_FUNC(PyTZInfo_Check, PyTZInfo_CheckExact)
}


/* Makes three variations on timezone representing UTC-5:
   1. timezone with offset and name from PyDateTimeAPI
   2. timezone with offset and name from PyTimeZone_FromOffsetAndName
   3. timezone with offset (no name) from PyTimeZone_FromOffset
*/
static PyObject *
make_timezones_capi(PyObject *self, PyObject *args) {
    PyObject *offset = PyDelta_FromDSU(0, -18000, 0);
    PyObject *name = PyUnicode_FromString("EST");

    PyObject *est_zone_capi = PyDateTimeAPI->TimeZone_FromTimeZone(offset, name);
    PyObject *est_zone_macro = PyTimeZone_FromOffsetAndName(offset, name);
    PyObject *est_zone_macro_noname = PyTimeZone_FromOffset(offset);

    Py_DecRef(offset);
    Py_DecRef(name);

    PyObject *rv = PyTuple_New(3);

    PyTuple_SET_ITEM(rv, 0, est_zone_capi);
    PyTuple_SET_ITEM(rv, 1, est_zone_macro);
    PyTuple_SET_ITEM(rv, 2, est_zone_macro_noname);

    return rv;
}

static PyObject *
get_timezones_offset_zero(PyObject *self, PyObject *args) {
    PyObject *offset = PyDelta_FromDSU(0, 0, 0);
    PyObject *name = PyUnicode_FromString("");

    // These two should return the UTC singleton
    PyObject *utc_singleton_0 = PyTimeZone_FromOffset(offset);
    PyObject *utc_singleton_1 = PyTimeZone_FromOffsetAndName(offset, NULL);

    // This one will return +00:00 zone, but not the UTC singleton
    PyObject *non_utc_zone = PyTimeZone_FromOffsetAndName(offset, name);

    Py_DecRef(offset);
    Py_DecRef(name);

    PyObject *rv = PyTuple_New(3);
    PyTuple_SET_ITEM(rv, 0, utc_singleton_0);
    PyTuple_SET_ITEM(rv, 1, utc_singleton_1);
    PyTuple_SET_ITEM(rv, 2, non_utc_zone);

    return rv;
}

static PyObject *
get_timezone_utc_capi(PyObject* self, PyObject *args) {
    int macro = 0;
    if (!PyArg_ParseTuple(args, "|p", &macro)) {
        return NULL;
    }
    if (macro) {
        Py_INCREF(PyDateTime_TimeZone_UTC);
        return PyDateTime_TimeZone_UTC;
    } else {
        Py_INCREF(PyDateTimeAPI->TimeZone_UTC);
        return PyDateTimeAPI->TimeZone_UTC;
    }
}

static PyObject *
get_date_fromdate(PyObject *self, PyObject *args)
{
    PyObject *rv = NULL;
    int macro;
    int year, month, day;

    if (!PyArg_ParseTuple(args, "piii", &macro, &year, &month, &day)) {
        return NULL;
    }

    if (macro) {
        rv = PyDate_FromDate(year, month, day);
    }
    else {
        rv = PyDateTimeAPI->Date_FromDate(
            year, month, day,
            PyDateTimeAPI->DateType);
    }
    return rv;
}

static PyObject *
get_datetime_fromdateandtime(PyObject *self, PyObject *args)
{
    PyObject *rv = NULL;
    int macro;
    int year, month, day;
    int hour, minute, second, microsecond;

    if (!PyArg_ParseTuple(args, "piiiiiii",
                          &macro,
                          &year, &month, &day,
                          &hour, &minute, &second, &microsecond)) {
        return NULL;
    }

    if (macro) {
        rv = PyDateTime_FromDateAndTime(
            year, month, day,
            hour, minute, second, microsecond);
    }
    else {
        rv = PyDateTimeAPI->DateTime_FromDateAndTime(
            year, month, day,
            hour, minute, second, microsecond,
            Py_None,
            PyDateTimeAPI->DateTimeType);
    }
    return rv;
}

static PyObject *
get_datetime_fromdateandtimeandfold(PyObject *self, PyObject *args)
{
    PyObject *rv = NULL;
    int macro;
    int year, month, day;
    int hour, minute, second, microsecond, fold;

    if (!PyArg_ParseTuple(args, "piiiiiiii",
                          &macro,
                          &year, &month, &day,
                          &hour, &minute, &second, &microsecond,
                          &fold)) {
        return NULL;
    }

    if (macro) {
        rv = PyDateTime_FromDateAndTimeAndFold(
            year, month, day,
            hour, minute, second, microsecond,
            fold);
    }
    else {
        rv = PyDateTimeAPI->DateTime_FromDateAndTimeAndFold(
            year, month, day,
            hour, minute, second, microsecond,
            Py_None,
            fold,
            PyDateTimeAPI->DateTimeType);
    }
    return rv;
}

static PyObject *
get_time_fromtime(PyObject *self, PyObject *args)
{
    PyObject *rv = NULL;
    int macro;
    int hour, minute, second, microsecond;

    if (!PyArg_ParseTuple(args, "piiii",
                          &macro,
                          &hour, &minute, &second, &microsecond)) {
        return NULL;
    }

    if (macro) {
        rv = PyTime_FromTime(hour, minute, second, microsecond);
    }
    else {
        rv = PyDateTimeAPI->Time_FromTime(
            hour, minute, second, microsecond,
            Py_None,
            PyDateTimeAPI->TimeType);
    }
    return rv;
}

static PyObject *
get_time_fromtimeandfold(PyObject *self, PyObject *args)
{
    PyObject *rv = NULL;
    int macro;
    int hour, minute, second, microsecond, fold;

    if (!PyArg_ParseTuple(args, "piiiii",
                          &macro,
                          &hour, &minute, &second, &microsecond,
                          &fold)) {
        return NULL;
    }

    if (macro) {
        rv = PyTime_FromTimeAndFold(hour, minute, second, microsecond, fold);
    }
    else {
        rv = PyDateTimeAPI->Time_FromTimeAndFold(
            hour, minute, second, microsecond,
            Py_None,
            fold,
            PyDateTimeAPI->TimeType);
    }
    return rv;
}

static PyObject *
get_delta_fromdsu(PyObject *self, PyObject *args)
{
    PyObject *rv = NULL;
    int macro;
    int days, seconds, microseconds;

    if (!PyArg_ParseTuple(args, "piii",
                          &macro,
                          &days, &seconds, &microseconds)) {
        return NULL;
    }

    if (macro) {
        rv = PyDelta_FromDSU(days, seconds, microseconds);
    }
    else {
        rv = PyDateTimeAPI->Delta_FromDelta(
            days, seconds, microseconds, 1,
            PyDateTimeAPI->DeltaType);
    }

    return rv;
}

static PyObject *
get_date_fromtimestamp(PyObject* self, PyObject *args)
{
    PyObject *tsargs = NULL, *ts = NULL, *rv = NULL;
    int macro = 0;

    if (!PyArg_ParseTuple(args, "O|p", &ts, &macro)) {
        return NULL;
    }

    // Construct the argument tuple
    if ((tsargs = PyTuple_Pack(1, ts)) == NULL) {
        return NULL;
    }

    // Pass along to the API function
    if (macro) {
        rv = PyDate_FromTimestamp(tsargs);
    }
    else {
        rv = PyDateTimeAPI->Date_FromTimestamp(
                (PyObject *)PyDateTimeAPI->DateType, tsargs
        );
    }

    Py_DECREF(tsargs);
    return rv;
}

static PyObject *
get_datetime_fromtimestamp(PyObject* self, PyObject *args)
{
    int macro = 0;
    int usetz = 0;
    PyObject *tsargs = NULL, *ts = NULL, *tzinfo = Py_None, *rv = NULL;
    if (!PyArg_ParseTuple(args, "OO|pp", &ts, &tzinfo, &usetz, &macro)) {
        return NULL;
    }

    // Construct the argument tuple
    if (usetz) {
        tsargs = PyTuple_Pack(2, ts, tzinfo);
    }
    else {
        tsargs = PyTuple_Pack(1, ts);
    }

    if (tsargs == NULL) {
        return NULL;
    }

    // Pass along to the API function
    if (macro) {
        rv = PyDateTime_FromTimestamp(tsargs);
    }
    else {
        rv = PyDateTimeAPI->DateTime_FromTimestamp(
                (PyObject *)PyDateTimeAPI->DateTimeType, tsargs, NULL
        );
    }

    Py_DECREF(tsargs);
    return rv;
}

static PyObject *
test_PyDateTime_GET(PyObject *self, PyObject *obj)
{
    int year, month, day;

    year = PyDateTime_GET_YEAR(obj);
    month = PyDateTime_GET_MONTH(obj);
    day = PyDateTime_GET_DAY(obj);

    return Py_BuildValue("(lll)", year, month, day);
}

static PyObject *
test_PyDateTime_DATE_GET(PyObject *self, PyObject *obj)
{
    int hour, minute, second, microsecond;

    hour = PyDateTime_DATE_GET_HOUR(obj);
    minute = PyDateTime_DATE_GET_MINUTE(obj);
    second = PyDateTime_DATE_GET_SECOND(obj);
    microsecond = PyDateTime_DATE_GET_MICROSECOND(obj);
    PyObject *tzinfo = PyDateTime_DATE_GET_TZINFO(obj);

    return Py_BuildValue("(llllO)", hour, minute, second, microsecond, tzinfo);
}

static PyObject *
test_PyDateTime_TIME_GET(PyObject *self, PyObject *obj)
{
    int hour, minute, second, microsecond;

    hour = PyDateTime_TIME_GET_HOUR(obj);
    minute = PyDateTime_TIME_GET_MINUTE(obj);
    second = PyDateTime_TIME_GET_SECOND(obj);
    microsecond = PyDateTime_TIME_GET_MICROSECOND(obj);
    PyObject *tzinfo = PyDateTime_TIME_GET_TZINFO(obj);

    return Py_BuildValue("(llllO)", hour, minute, second, microsecond, tzinfo);
}

static PyObject *
test_PyDateTime_DELTA_GET(PyObject *self, PyObject *obj)
{
    int days, seconds, microseconds;

    days = PyDateTime_DELTA_GET_DAYS(obj);
    seconds = PyDateTime_DELTA_GET_SECONDS(obj);
    microseconds = PyDateTime_DELTA_GET_MICROSECONDS(obj);

    return Py_BuildValue("(lll)", days, seconds, microseconds);
}

/* test_thread_state spawns a thread of its own, and that thread releases
 * `thread_done` when it's finished.  The driver code has to know when the
 * thread finishes, because the thread uses a PyObject (the callable) that
 * may go away when the driver finishes.  The former lack of this explicit
 * synchronization caused rare segfaults, so rare that they were seen only
 * on a Mac buildbot (although they were possible on any box).
 */
static PyThread_type_lock thread_done = NULL;

static int
_make_call(void *callable)
{
    PyObject *rc;
    int success;
    PyGILState_STATE s = PyGILState_Ensure();
    rc = PyObject_CallNoArgs((PyObject *)callable);
    success = (rc != NULL);
    Py_XDECREF(rc);
    PyGILState_Release(s);
    return success;
}

/* Same thing, but releases `thread_done` when it returns.  This variant
 * should be called only from threads spawned by test_thread_state().
 */
static void
_make_call_from_thread(void *callable)
{
    _make_call(callable);
    PyThread_release_lock(thread_done);
}

static PyObject *
test_thread_state(PyObject *self, PyObject *args)
{
    PyObject *fn;
    int success = 1;

    if (!PyArg_ParseTuple(args, "O:test_thread_state", &fn))
        return NULL;

    if (!PyCallable_Check(fn)) {
        PyErr_Format(PyExc_TypeError, "'%s' object is not callable",
            Py_TYPE(fn)->tp_name);
        return NULL;
    }

    thread_done = PyThread_allocate_lock();
    if (thread_done == NULL)
        return PyErr_NoMemory();
    PyThread_acquire_lock(thread_done, 1);

    /* Start a new thread with our callback. */
    PyThread_start_new_thread(_make_call_from_thread, fn);
    /* Make the callback with the thread lock held by this thread */
    success &= _make_call(fn);
    /* Do it all again, but this time with the thread-lock released */
    Py_BEGIN_ALLOW_THREADS
    success &= _make_call(fn);
    PyThread_acquire_lock(thread_done, 1);  /* wait for thread to finish */
    Py_END_ALLOW_THREADS

    /* And once more with and without a thread
       XXX - should use a lock and work out exactly what we are trying
       to test <wink>
    */
    Py_BEGIN_ALLOW_THREADS
    PyThread_start_new_thread(_make_call_from_thread, fn);
    success &= _make_call(fn);
    PyThread_acquire_lock(thread_done, 1);  /* wait for thread to finish */
    Py_END_ALLOW_THREADS

    /* Release lock we acquired above.  This is required on HP-UX. */
    PyThread_release_lock(thread_done);

    PyThread_free_lock(thread_done);
    if (!success)
        return NULL;
    Py_RETURN_NONE;
}

/* test Py_AddPendingCalls using threads */
static int _pending_callback(void *arg)
{
    /* we assume the argument is callable object to which we own a reference */
    PyObject *callable = (PyObject *)arg;
    PyObject *r = PyObject_CallNoArgs(callable);
    Py_DECREF(callable);
    Py_XDECREF(r);
    return r != NULL ? 0 : -1;
}

/* The following requests n callbacks to _pending_callback.  It can be
 * run from any python thread.
 */
static PyObject *
pending_threadfunc(PyObject *self, PyObject *arg)
{
    PyObject *callable;
    int r;
    if (PyArg_ParseTuple(arg, "O", &callable) == 0)
        return NULL;

    /* create the reference for the callbackwhile we hold the lock */
    Py_INCREF(callable);

    Py_BEGIN_ALLOW_THREADS
    r = Py_AddPendingCall(&_pending_callback, callable);
    Py_END_ALLOW_THREADS

    if (r<0) {
        Py_DECREF(callable); /* unsuccessful add, destroy the extra reference */
        Py_RETURN_FALSE;
    }
    Py_RETURN_TRUE;
}

/* Some tests of PyUnicode_FromFormat().  This needs more tests. */
static PyObject *
test_string_from_format(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *result;
    char *msg;

#define CHECK_1_FORMAT(FORMAT, TYPE)                                \
    result = PyUnicode_FromFormat(FORMAT, (TYPE)1);                 \
    if (result == NULL)                                             \
        return NULL;                                                \
    if (!_PyUnicode_EqualToASCIIString(result, "1")) {              \
        msg = FORMAT " failed at 1";                                \
        goto Fail;                                                  \
    }                                                               \
    Py_DECREF(result)

    CHECK_1_FORMAT("%d", int);
    CHECK_1_FORMAT("%ld", long);
    /* The z width modifier was added in Python 2.5. */
    CHECK_1_FORMAT("%zd", Py_ssize_t);

    /* The u type code was added in Python 2.5. */
    CHECK_1_FORMAT("%u", unsigned int);
    CHECK_1_FORMAT("%lu", unsigned long);
    CHECK_1_FORMAT("%zu", size_t);

    /* "%lld" and "%llu" support added in Python 2.7. */
    CHECK_1_FORMAT("%llu", unsigned long long);
    CHECK_1_FORMAT("%lld", long long);

    Py_RETURN_NONE;

 Fail:
    Py_XDECREF(result);
    return raiseTestError("test_string_from_format", msg);

#undef CHECK_1_FORMAT
}


static PyObject *
test_unicode_compare_with_ascii(PyObject *self, PyObject *Py_UNUSED(ignored)) {
    PyObject *py_s = PyUnicode_FromStringAndSize("str\0", 4);
    int result;
    if (py_s == NULL)
        return NULL;
    result = PyUnicode_CompareWithASCIIString(py_s, "str");
    Py_DECREF(py_s);
    if (!result) {
        PyErr_SetString(TestError, "Python string ending in NULL "
                        "should not compare equal to c string.");
        return NULL;
    }
    Py_RETURN_NONE;
}

/* This is here to provide a docstring for test_descr. */
static PyObject *
test_with_docstring(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    Py_RETURN_NONE;
}

/* Test PyOS_string_to_double. */
static PyObject *
test_string_to_double(PyObject *self, PyObject *Py_UNUSED(ignored)) {
    double result;
    const char *msg;

#define CHECK_STRING(STR, expected)                             \
    result = PyOS_string_to_double(STR, NULL, NULL);            \
    if (result == -1.0 && PyErr_Occurred())                     \
        return NULL;                                            \
    if (result != (double)expected) {                           \
        msg = "conversion of " STR " to float failed";          \
        goto fail;                                              \
    }

#define CHECK_INVALID(STR)                                              \
    result = PyOS_string_to_double(STR, NULL, NULL);                    \
    if (result == -1.0 && PyErr_Occurred()) {                           \
        if (PyErr_ExceptionMatches(PyExc_ValueError))                   \
            PyErr_Clear();                                              \
        else                                                            \
            return NULL;                                                \
    }                                                                   \
    else {                                                              \
        msg = "conversion of " STR " didn't raise ValueError";          \
        goto fail;                                                      \
    }

    CHECK_STRING("0.1", 0.1);
    CHECK_STRING("1.234", 1.234);
    CHECK_STRING("-1.35", -1.35);
    CHECK_STRING(".1e01", 1.0);
    CHECK_STRING("2.e-2", 0.02);

    CHECK_INVALID(" 0.1");
    CHECK_INVALID("\t\n-3");
    CHECK_INVALID(".123 ");
    CHECK_INVALID("3\n");
    CHECK_INVALID("123abc");

    Py_RETURN_NONE;
  fail:
    return raiseTestError("test_string_to_double", msg);
#undef CHECK_STRING
#undef CHECK_INVALID
}


/* Coverage testing of capsule objects. */

static const char *capsule_name = "capsule name";
static       char *capsule_pointer = "capsule pointer";
static       char *capsule_context = "capsule context";
static const char *capsule_error = NULL;
static int
capsule_destructor_call_count = 0;

static void
capsule_destructor(PyObject *o) {
    capsule_destructor_call_count++;
    if (PyCapsule_GetContext(o) != capsule_context) {
        capsule_error = "context did not match in destructor!";
    } else if (PyCapsule_GetDestructor(o) != capsule_destructor) {
        capsule_error = "destructor did not match in destructor!  (woah!)";
    } else if (PyCapsule_GetName(o) != capsule_name) {
        capsule_error = "name did not match in destructor!";
    } else if (PyCapsule_GetPointer(o, capsule_name) != capsule_pointer) {
        capsule_error = "pointer did not match in destructor!";
    }
}

typedef struct {
    char *name;
    char *module;
    char *attribute;
} known_capsule;

static PyObject *
test_capsule(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *object;
    const char *error = NULL;
    void *pointer;
    void *pointer2;
    known_capsule known_capsules[] = {
        #define KNOWN_CAPSULE(module, name)             { module "." name, module, name }
        KNOWN_CAPSULE("_socket", "CAPI"),
        KNOWN_CAPSULE("_curses", "_C_API"),
        KNOWN_CAPSULE("datetime", "datetime_CAPI"),
        { NULL, NULL },
    };
    known_capsule *known = &known_capsules[0];

#define FAIL(x) { error = (x); goto exit; }

#define CHECK_DESTRUCTOR \
    if (capsule_error) { \
        FAIL(capsule_error); \
    } \
    else if (!capsule_destructor_call_count) {          \
        FAIL("destructor not called!"); \
    } \
    capsule_destructor_call_count = 0; \

    object = PyCapsule_New(capsule_pointer, capsule_name, capsule_destructor);
    PyCapsule_SetContext(object, capsule_context);
    capsule_destructor(object);
    CHECK_DESTRUCTOR;
    Py_DECREF(object);
    CHECK_DESTRUCTOR;

    object = PyCapsule_New(known, "ignored", NULL);
    PyCapsule_SetPointer(object, capsule_pointer);
    PyCapsule_SetName(object, capsule_name);
    PyCapsule_SetDestructor(object, capsule_destructor);
    PyCapsule_SetContext(object, capsule_context);
    capsule_destructor(object);
    CHECK_DESTRUCTOR;
    /* intentionally access using the wrong name */
    pointer2 = PyCapsule_GetPointer(object, "the wrong name");
    if (!PyErr_Occurred()) {
        FAIL("PyCapsule_GetPointer should have failed but did not!");
    }
    PyErr_Clear();
    if (pointer2) {
        if (pointer2 == capsule_pointer) {
            FAIL("PyCapsule_GetPointer should not have"
                     " returned the internal pointer!");
        } else {
            FAIL("PyCapsule_GetPointer should have "
                     "returned NULL pointer but did not!");
        }
    }
    PyCapsule_SetDestructor(object, NULL);
    Py_DECREF(object);
    if (capsule_destructor_call_count) {
        FAIL("destructor called when it should not have been!");
    }

    for (known = &known_capsules[0]; known->module != NULL; known++) {
        /* yeah, ordinarily I wouldn't do this either,
           but it's fine for this test harness.
        */
        static char buffer[256];
#undef FAIL
#define FAIL(x) \
        { \
        sprintf(buffer, "%s module: \"%s\" attribute: \"%s\"", \
            x, known->module, known->attribute); \
        error = buffer; \
        goto exit; \
        } \

        PyObject *module = PyImport_ImportModule(known->module);
        if (module) {
            pointer = PyCapsule_Import(known->name, 0);
            if (!pointer) {
                Py_DECREF(module);
                FAIL("PyCapsule_GetPointer returned NULL unexpectedly!");
            }
            object = PyObject_GetAttrString(module, known->attribute);
            if (!object) {
                Py_DECREF(module);
                return NULL;
            }
            pointer2 = PyCapsule_GetPointer(object,
                                    "weebles wobble but they don't fall down");
            if (!PyErr_Occurred()) {
                Py_DECREF(object);
                Py_DECREF(module);
                FAIL("PyCapsule_GetPointer should have failed but did not!");
            }
            PyErr_Clear();
            if (pointer2) {
                Py_DECREF(module);
                Py_DECREF(object);
                if (pointer2 == pointer) {
                    FAIL("PyCapsule_GetPointer should not have"
                             " returned its internal pointer!");
                } else {
                    FAIL("PyCapsule_GetPointer should have"
                             " returned NULL pointer but did not!");
                }
            }
            Py_DECREF(object);
            Py_DECREF(module);
        }
        else
            PyErr_Clear();
    }

  exit:
    if (error) {
        return raiseTestError("test_capsule", error);
    }
    Py_RETURN_NONE;
#undef FAIL
}

#ifdef HAVE_GETTIMEOFDAY
/* Profiling of integer performance */
static void print_delta(int test, struct timeval *s, struct timeval *e)
{
    e->tv_sec -= s->tv_sec;
    e->tv_usec -= s->tv_usec;
    if (e->tv_usec < 0) {
        e->tv_sec -=1;
        e->tv_usec += 1000000;
    }
    printf("Test %d: %d.%06ds\n", test, (int)e->tv_sec, (int)e->tv_usec);
}

static PyObject *
profile_int(PyObject *self, PyObject* args)
{
    int i, k;
    struct timeval start, stop;
    PyObject *single, **multiple, *op1, *result;

    /* Test 1: Allocate and immediately deallocate
       many small integers */
    gettimeofday(&start, NULL);
    for(k=0; k < 20000; k++)
        for(i=0; i < 1000; i++) {
            single = PyLong_FromLong(i);
            Py_DECREF(single);
        }
    gettimeofday(&stop, NULL);
    print_delta(1, &start, &stop);

    /* Test 2: Allocate and immediately deallocate
       many large integers */
    gettimeofday(&start, NULL);
    for(k=0; k < 20000; k++)
        for(i=0; i < 1000; i++) {
            single = PyLong_FromLong(i+1000000);
            Py_DECREF(single);
        }
    gettimeofday(&stop, NULL);
    print_delta(2, &start, &stop);

    /* Test 3: Allocate a few integers, then release
       them all simultaneously. */
    multiple = malloc(sizeof(PyObject*) * 1000);
    if (multiple == NULL)
        return PyErr_NoMemory();
    gettimeofday(&start, NULL);
    for(k=0; k < 20000; k++) {
        for(i=0; i < 1000; i++) {
            multiple[i] = PyLong_FromLong(i+1000000);
        }
        for(i=0; i < 1000; i++) {
            Py_DECREF(multiple[i]);
        }
    }
    gettimeofday(&stop, NULL);
    print_delta(3, &start, &stop);
    free(multiple);

    /* Test 4: Allocate many integers, then release
       them all simultaneously. */
    multiple = malloc(sizeof(PyObject*) * 1000000);
    if (multiple == NULL)
        return PyErr_NoMemory();
    gettimeofday(&start, NULL);
    for(k=0; k < 20; k++) {
        for(i=0; i < 1000000; i++) {
            multiple[i] = PyLong_FromLong(i+1000000);
        }
        for(i=0; i < 1000000; i++) {
            Py_DECREF(multiple[i]);
        }
    }
    gettimeofday(&stop, NULL);
    print_delta(4, &start, &stop);
    free(multiple);

    /* Test 5: Allocate many integers < 32000 */
    multiple = malloc(sizeof(PyObject*) * 1000000);
    if (multiple == NULL)
        return PyErr_NoMemory();
    gettimeofday(&start, NULL);
    for(k=0; k < 10; k++) {
        for(i=0; i < 1000000; i++) {
            multiple[i] = PyLong_FromLong(i+1000);
        }
        for(i=0; i < 1000000; i++) {
            Py_DECREF(multiple[i]);
        }
    }
    gettimeofday(&stop, NULL);
    print_delta(5, &start, &stop);
    free(multiple);

    /* Test 6: Perform small int addition */
    op1 = PyLong_FromLong(1);
    gettimeofday(&start, NULL);
    for(i=0; i < 10000000; i++) {
        result = PyNumber_Add(op1, op1);
        Py_DECREF(result);
    }
    gettimeofday(&stop, NULL);
    Py_DECREF(op1);
    print_delta(6, &start, &stop);

    /* Test 7: Perform medium int addition */
    op1 = PyLong_FromLong(1000);
    if (op1 == NULL)
        return NULL;
    gettimeofday(&start, NULL);
    for(i=0; i < 10000000; i++) {
        result = PyNumber_Add(op1, op1);
        Py_XDECREF(result);
    }
    gettimeofday(&stop, NULL);
    Py_DECREF(op1);
    print_delta(7, &start, &stop);

    Py_RETURN_NONE;
}
#endif

/* To test the format of tracebacks as printed out. */
static PyObject *
traceback_print(PyObject *self, PyObject *args)
{
    PyObject *file;
    PyObject *traceback;
    int result;

    if (!PyArg_ParseTuple(args, "OO:traceback_print",
                            &traceback, &file))
        return NULL;

    result = PyTraceBack_Print(traceback, file);
    if (result < 0)
        return NULL;
    Py_RETURN_NONE;
}

/* To test the format of exceptions as printed out. */
static PyObject *
exception_print(PyObject *self, PyObject *args)
{
    PyObject *value;
    PyObject *tb = NULL;

    if (!PyArg_ParseTuple(args, "O:exception_print",
                            &value)) {
        return NULL;
    }

    if (PyExceptionInstance_Check(value)) {
        tb = PyException_GetTraceback(value);
    }

    PyErr_Display((PyObject *) Py_TYPE(value), value, tb);
    Py_XDECREF(tb);

    Py_RETURN_NONE;
}




/* reliably raise a MemoryError */
static PyObject *
raise_memoryerror(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyErr_NoMemory();
    return NULL;
}

/* Issue 6012 */
static PyObject *str1, *str2;
static int
failing_converter(PyObject *obj, void *arg)
{
    /* Clone str1, then let the conversion fail. */
    assert(str1);
    str2 = str1;
    Py_INCREF(str2);
    return 0;
}
static PyObject*
argparsing(PyObject *o, PyObject *args)
{
    PyObject *res;
    str1 = str2 = NULL;
    if (!PyArg_ParseTuple(args, "O&O&",
                          PyUnicode_FSConverter, &str1,
                          failing_converter, &str2)) {
        if (!str2)
            /* argument converter not called? */
            return NULL;
        /* Should be 1 */
        res = PyLong_FromSsize_t(Py_REFCNT(str2));
        Py_DECREF(str2);
        PyErr_Clear();
        return res;
    }
    Py_RETURN_NONE;
}

/* To test that the result of PyCode_NewEmpty has the right members. */
static PyObject *
code_newempty(PyObject *self, PyObject *args)
{
    const char *filename;
    const char *funcname;
    int firstlineno;

    if (!PyArg_ParseTuple(args, "ssi:code_newempty",
                          &filename, &funcname, &firstlineno))
        return NULL;

    return (PyObject *)PyCode_NewEmpty(filename, funcname, firstlineno);
}

/* Test PyErr_NewExceptionWithDoc (also exercise PyErr_NewException).
   Run via Lib/test/test_exceptions.py */
static PyObject *
make_exception_with_doc(PyObject *self, PyObject *args, PyObject *kwargs)
{
    const char *name;
    const char *doc = NULL;
    PyObject *base = NULL;
    PyObject *dict = NULL;

    static char *kwlist[] = {"name", "doc", "base", "dict", NULL};

    if (!PyArg_ParseTupleAndKeywords(args, kwargs,
                    "s|sOO:make_exception_with_doc", kwlist,
                                     &name, &doc, &base, &dict))
        return NULL;

    return PyErr_NewExceptionWithDoc(name, doc, base, dict);
}

static PyObject *
make_memoryview_from_NULL_pointer(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    Py_buffer info;
    if (PyBuffer_FillInfo(&info, NULL, NULL, 1, 1, PyBUF_FULL_RO) < 0)
        return NULL;
    return PyMemoryView_FromBuffer(&info);
}

static PyObject *
test_from_contiguous(PyObject* self, PyObject *Py_UNUSED(ignored))
{
    int data[9] = {-1,-1,-1,-1,-1,-1,-1,-1,-1};
    int init[5] = {0, 1, 2, 3, 4};
    Py_ssize_t itemsize = sizeof(int);
    Py_ssize_t shape = 5;
    Py_ssize_t strides = 2 * itemsize;
    Py_buffer view = {
        data,
        NULL,
        5 * itemsize,
        itemsize,
        1,
        1,
        NULL,
        &shape,
        &strides,
        NULL,
        NULL
    };
    int *ptr;
    int i;

    PyBuffer_FromContiguous(&view, init, view.len, 'C');
    ptr = view.buf;
    for (i = 0; i < 5; i++) {
        if (ptr[2*i] != i) {
            PyErr_SetString(TestError,
                "test_from_contiguous: incorrect result");
            return NULL;
        }
    }

    view.buf = &data[8];
    view.strides[0] = -2 * itemsize;

    PyBuffer_FromContiguous(&view, init, view.len, 'C');
    ptr = view.buf;
    for (i = 0; i < 5; i++) {
        if (*(ptr-2*i) != i) {
            PyErr_SetString(TestError,
                "test_from_contiguous: incorrect result");
            return NULL;
        }
    }

    Py_RETURN_NONE;
}

#if (defined(__linux__) || defined(__FreeBSD__)) && defined(__GNUC__)
extern PyTypeObject _PyBytesIOBuffer_Type;

static PyObject *
test_pep3118_obsolete_write_locks(PyObject* self, PyObject *Py_UNUSED(ignored))
{
    PyTypeObject *type = &_PyBytesIOBuffer_Type;
    PyObject *b;
    char *dummy[1];
    int ret, match;

    /* PyBuffer_FillInfo() */
    ret = PyBuffer_FillInfo(NULL, NULL, dummy, 1, 0, PyBUF_SIMPLE);
    match = PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_BufferError);
    PyErr_Clear();
    if (ret != -1 || match == 0)
        goto error;

    /* bytesiobuf_getbuffer() */
    b = type->tp_alloc(type, 0);
    if (b == NULL) {
        return NULL;
    }

    ret = PyObject_GetBuffer(b, NULL, PyBUF_SIMPLE);
    Py_DECREF(b);
    match = PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_BufferError);
    PyErr_Clear();
    if (ret != -1 || match == 0)
        goto error;

    Py_RETURN_NONE;

error:
    PyErr_SetString(TestError,
        "test_pep3118_obsolete_write_locks: failure");
    return NULL;
}
#endif

/* This tests functions that historically supported write locks.  It is
   wrong to call getbuffer() with view==NULL and a compliant getbufferproc
   is entitled to segfault in that case. */
static PyObject *
getbuffer_with_null_view(PyObject* self, PyObject *obj)
{
    if (PyObject_GetBuffer(obj, NULL, PyBUF_SIMPLE) < 0)
        return NULL;

    Py_RETURN_NONE;
}

/* PyBuffer_SizeFromFormat() */
static PyObject *
test_PyBuffer_SizeFromFormat(PyObject *self, PyObject *args)
{
    const char *format;
    Py_ssize_t result;

    if (!PyArg_ParseTuple(args, "s:test_PyBuffer_SizeFromFormat",
                          &format)) {
        return NULL;
    }

    result = PyBuffer_SizeFromFormat(format);
    if (result == -1) {
        return NULL;
    }

    return PyLong_FromSsize_t(result);
}

/* Test that the fatal error from not having a current thread doesn't
   cause an infinite loop.  Run via Lib/test/test_capi.py */
static PyObject *
crash_no_current_thread(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    Py_BEGIN_ALLOW_THREADS
    /* Using PyThreadState_Get() directly allows the test to pass in
       !pydebug mode. However, the test only actually tests anything
       in pydebug mode, since that's where the infinite loop was in
       the first place. */
    PyThreadState_Get();
    Py_END_ALLOW_THREADS
    return NULL;
}

/* To run some code in a sub-interpreter. */
static PyObject *
run_in_subinterp(PyObject *self, PyObject *args)
{
    const char *code;
    int r;
    PyThreadState *substate, *mainstate;
    /* only initialise 'cflags.cf_flags' to test backwards compatibility */
    PyCompilerFlags cflags = {0};

    if (!PyArg_ParseTuple(args, "s:run_in_subinterp",
                          &code))
        return NULL;

    mainstate = PyThreadState_Get();

    PyThreadState_Swap(NULL);

    substate = Py_NewInterpreter();
    if (substate == NULL) {
        /* Since no new thread state was created, there is no exception to
           propagate; raise a fresh one after swapping in the old thread
           state. */
        PyThreadState_Swap(mainstate);
        PyErr_SetString(PyExc_RuntimeError, "sub-interpreter creation failed");
        return NULL;
    }
    r = PyRun_SimpleStringFlags(code, &cflags);
    Py_EndInterpreter(substate);

    PyThreadState_Swap(mainstate);

    return PyLong_FromLong(r);
}

static int
check_time_rounding(int round)
{
    if (round != _PyTime_ROUND_FLOOR
        && round != _PyTime_ROUND_CEILING
        && round != _PyTime_ROUND_HALF_EVEN
        && round != _PyTime_ROUND_UP) {
        PyErr_SetString(PyExc_ValueError, "invalid rounding");
        return -1;
    }
    return 0;
}

static PyObject *
test_pytime_object_to_time_t(PyObject *self, PyObject *args)
{
    PyObject *obj;
    time_t sec;
    int round;
    if (!PyArg_ParseTuple(args, "Oi:pytime_object_to_time_t", &obj, &round))
        return NULL;
    if (check_time_rounding(round) < 0)
        return NULL;
    if (_PyTime_ObjectToTime_t(obj, &sec, round) == -1)
        return NULL;
    return _PyLong_FromTime_t(sec);
}

static PyObject *
test_pytime_object_to_timeval(PyObject *self, PyObject *args)
{
    PyObject *obj;
    time_t sec;
    long usec;
    int round;
    if (!PyArg_ParseTuple(args, "Oi:pytime_object_to_timeval", &obj, &round))
        return NULL;
    if (check_time_rounding(round) < 0)
        return NULL;
    if (_PyTime_ObjectToTimeval(obj, &sec, &usec, round) == -1)
        return NULL;
    return Py_BuildValue("Nl", _PyLong_FromTime_t(sec), usec);
}

static PyObject *
test_pytime_object_to_timespec(PyObject *self, PyObject *args)
{
    PyObject *obj;
    time_t sec;
    long nsec;
    int round;
    if (!PyArg_ParseTuple(args, "Oi:pytime_object_to_timespec", &obj, &round))
        return NULL;
    if (check_time_rounding(round) < 0)
        return NULL;
    if (_PyTime_ObjectToTimespec(obj, &sec, &nsec, round) == -1)
        return NULL;
    return Py_BuildValue("Nl", _PyLong_FromTime_t(sec), nsec);
}

static void
slot_tp_del(PyObject *self)
{
    _Py_IDENTIFIER(__tp_del__);
    PyObject *del, *res;
    PyObject *error_type, *error_value, *error_traceback;

    /* Temporarily resurrect the object. */
    assert(Py_REFCNT(self) == 0);
    Py_SET_REFCNT(self, 1);

    /* Save the current exception, if any. */
    PyErr_Fetch(&error_type, &error_value, &error_traceback);

    /* Execute __del__ method, if any. */
    del = _PyObject_LookupSpecial(self, &PyId___tp_del__);
    if (del != NULL) {
        res = PyObject_CallNoArgs(del);
        if (res == NULL)
            PyErr_WriteUnraisable(del);
        else
            Py_DECREF(res);
        Py_DECREF(del);
    }

    /* Restore the saved exception. */
    PyErr_Restore(error_type, error_value, error_traceback);

    /* Undo the temporary resurrection; can't use DECREF here, it would
     * cause a recursive call.
     */
    assert(Py_REFCNT(self) > 0);
    Py_SET_REFCNT(self, Py_REFCNT(self) - 1);
    if (Py_REFCNT(self) == 0) {
        /* this is the normal path out */
        return;
    }

    /* __del__ resurrected it!  Make it look like the original Py_DECREF
     * never happened.
     */
    {
        Py_ssize_t refcnt = Py_REFCNT(self);
        _Py_NewReference(self);
        Py_SET_REFCNT(self, refcnt);
    }
    assert(!PyType_IS_GC(Py_TYPE(self)) || PyObject_GC_IsTracked(self));
    /* If Py_REF_DEBUG macro is defined, _Py_NewReference() increased
       _Py_RefTotal, so we need to undo that. */
#ifdef Py_REF_DEBUG
    _Py_RefTotal--;
#endif
}

static PyObject *
with_tp_del(PyObject *self, PyObject *args)
{
    PyObject *obj;
    PyTypeObject *tp;

    if (!PyArg_ParseTuple(args, "O:with_tp_del", &obj))
        return NULL;
    tp = (PyTypeObject *) obj;
    if (!PyType_Check(obj) || !PyType_HasFeature(tp, Py_TPFLAGS_HEAPTYPE)) {
        PyErr_Format(PyExc_TypeError,
                     "heap type expected, got %R", obj);
        return NULL;
    }
    tp->tp_del = slot_tp_del;
    Py_INCREF(obj);
    return obj;
}

static PyObject *
without_gc(PyObject *Py_UNUSED(self), PyObject *obj)
{
    PyTypeObject *tp = (PyTypeObject*)obj;
    if (!PyType_Check(obj) || !PyType_HasFeature(tp, Py_TPFLAGS_HEAPTYPE)) {
        return PyErr_Format(PyExc_TypeError, "heap type expected, got %R", obj);
    }
    if (PyType_IS_GC(tp)) {
        // Don't try this at home, kids:
        tp->tp_flags -= Py_TPFLAGS_HAVE_GC;
        tp->tp_free = PyObject_Del;
        tp->tp_traverse = NULL;
        tp->tp_clear = NULL;
    }
    assert(!PyType_IS_GC(tp));
    Py_INCREF(obj);
    return obj;
}

static PyMethodDef ml;

static PyObject *
create_cfunction(PyObject *self, PyObject *args)
{
    return PyCFunction_NewEx(&ml, self, NULL);
}

static PyMethodDef ml = {
    "create_cfunction",
    create_cfunction,
    METH_NOARGS,
    NULL
};

static PyObject *
_test_incref(PyObject *ob)
{
    Py_INCREF(ob);
    return ob;
}

static PyObject *
test_xincref_doesnt_leak(PyObject *ob, PyObject *Py_UNUSED(ignored))
{
    PyObject *obj = PyLong_FromLong(0);
    Py_XINCREF(_test_incref(obj));
    Py_DECREF(obj);
    Py_DECREF(obj);
    Py_DECREF(obj);
    Py_RETURN_NONE;
}

static PyObject *
test_incref_doesnt_leak(PyObject *ob, PyObject *Py_UNUSED(ignored))
{
    PyObject *obj = PyLong_FromLong(0);
    Py_INCREF(_test_incref(obj));
    Py_DECREF(obj);
    Py_DECREF(obj);
    Py_DECREF(obj);
    Py_RETURN_NONE;
}

static PyObject *
test_xdecref_doesnt_leak(PyObject *ob, PyObject *Py_UNUSED(ignored))
{
    Py_XDECREF(PyLong_FromLong(0));
    Py_RETURN_NONE;
}

static PyObject *
test_decref_doesnt_leak(PyObject *ob, PyObject *Py_UNUSED(ignored))
{
    Py_DECREF(PyLong_FromLong(0));
    Py_RETURN_NONE;
}

static PyObject *
test_structseq_newtype_doesnt_leak(PyObject *Py_UNUSED(self),
                              PyObject *Py_UNUSED(args))
{
    PyStructSequence_Desc descr;
    PyStructSequence_Field descr_fields[3];

    descr_fields[0] = (PyStructSequence_Field){"foo", "foo value"};
    descr_fields[1] = (PyStructSequence_Field){NULL, "some hidden value"};
    descr_fields[2] = (PyStructSequence_Field){0, NULL};

    descr.name = "_testcapi.test_descr";
    descr.doc = "This is used to test for memory leaks in NewType";
    descr.fields = descr_fields;
    descr.n_in_sequence = 1;

    PyTypeObject* structseq_type = PyStructSequence_NewType(&descr);
    assert(structseq_type != NULL);
    assert(PyType_Check(structseq_type));
    assert(PyType_FastSubclass(structseq_type, Py_TPFLAGS_TUPLE_SUBCLASS));
    Py_DECREF(structseq_type);

    Py_RETURN_NONE;
}

static PyObject *
test_structseq_newtype_null_descr_doc(PyObject *Py_UNUSED(self),
                              PyObject *Py_UNUSED(args))
{
    PyStructSequence_Field descr_fields[1] = {
        (PyStructSequence_Field){NULL, NULL}
    };
    // Test specifically for NULL .doc field.
    PyStructSequence_Desc descr = {"_testcapi.test_descr", NULL, &descr_fields[0], 0};

    PyTypeObject* structseq_type = PyStructSequence_NewType(&descr);
    assert(structseq_type != NULL);
    assert(PyType_Check(structseq_type));
    assert(PyType_FastSubclass(structseq_type, Py_TPFLAGS_TUPLE_SUBCLASS));
    Py_DECREF(structseq_type);

    Py_RETURN_NONE;
}

static PyObject *
test_incref_decref_API(PyObject *ob, PyObject *Py_UNUSED(ignored))
{
    PyObject *obj = PyLong_FromLong(0);
    Py_IncRef(obj);
    Py_DecRef(obj);
    Py_DecRef(obj);
    Py_RETURN_NONE;
}

static PyObject *
test_pymem_alloc0(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    void *ptr;

    ptr = PyMem_RawMalloc(0);
    if (ptr == NULL) {
        PyErr_SetString(PyExc_RuntimeError, "PyMem_RawMalloc(0) returns NULL");
        return NULL;
    }
    PyMem_RawFree(ptr);

    ptr = PyMem_RawCalloc(0, 0);
    if (ptr == NULL) {
        PyErr_SetString(PyExc_RuntimeError, "PyMem_RawCalloc(0, 0) returns NULL");
        return NULL;
    }
    PyMem_RawFree(ptr);

    ptr = PyMem_Malloc(0);
    if (ptr == NULL) {
        PyErr_SetString(PyExc_RuntimeError, "PyMem_Malloc(0) returns NULL");
        return NULL;
    }
    PyMem_Free(ptr);

    ptr = PyMem_Calloc(0, 0);
    if (ptr == NULL) {
        PyErr_SetString(PyExc_RuntimeError, "PyMem_Calloc(0, 0) returns NULL");
        return NULL;
    }
    PyMem_Free(ptr);

    ptr = PyObject_Malloc(0);
    if (ptr == NULL) {
        PyErr_SetString(PyExc_RuntimeError, "PyObject_Malloc(0) returns NULL");
        return NULL;
    }
    PyObject_Free(ptr);

    ptr = PyObject_Calloc(0, 0);
    if (ptr == NULL) {
        PyErr_SetString(PyExc_RuntimeError, "PyObject_Calloc(0, 0) returns NULL");
        return NULL;
    }
    PyObject_Free(ptr);

    Py_RETURN_NONE;
}

typedef struct {
    PyMemAllocatorEx alloc;

    size_t malloc_size;
    size_t calloc_nelem;
    size_t calloc_elsize;
    void *realloc_ptr;
    size_t realloc_new_size;
    void *free_ptr;
    void *ctx;
} alloc_hook_t;

static void* hook_malloc(void* ctx, size_t size)
{
    alloc_hook_t *hook = (alloc_hook_t *)ctx;
    hook->ctx = ctx;
    hook->malloc_size = size;
    return hook->alloc.malloc(hook->alloc.ctx, size);
}

static void* hook_calloc(void* ctx, size_t nelem, size_t elsize)
{
    alloc_hook_t *hook = (alloc_hook_t *)ctx;
    hook->ctx = ctx;
    hook->calloc_nelem = nelem;
    hook->calloc_elsize = elsize;
    return hook->alloc.calloc(hook->alloc.ctx, nelem, elsize);
}

static void* hook_realloc(void* ctx, void* ptr, size_t new_size)
{
    alloc_hook_t *hook = (alloc_hook_t *)ctx;
    hook->ctx = ctx;
    hook->realloc_ptr = ptr;
    hook->realloc_new_size = new_size;
    return hook->alloc.realloc(hook->alloc.ctx, ptr, new_size);
}

static void hook_free(void *ctx, void *ptr)
{
    alloc_hook_t *hook = (alloc_hook_t *)ctx;
    hook->ctx = ctx;
    hook->free_ptr = ptr;
    hook->alloc.free(hook->alloc.ctx, ptr);
}

static PyObject *
test_setallocators(PyMemAllocatorDomain domain)
{
    PyObject *res = NULL;
    const char *error_msg;
    alloc_hook_t hook;
    PyMemAllocatorEx alloc;
    size_t size, size2, nelem, elsize;
    void *ptr, *ptr2;

    memset(&hook, 0, sizeof(hook));

    alloc.ctx = &hook;
    alloc.malloc = &hook_malloc;
    alloc.calloc = &hook_calloc;
    alloc.realloc = &hook_realloc;
    alloc.free = &hook_free;
    PyMem_GetAllocator(domain, &hook.alloc);
    PyMem_SetAllocator(domain, &alloc);

    /* malloc, realloc, free */
    size = 42;
    hook.ctx = NULL;
    switch(domain)
    {
    case PYMEM_DOMAIN_RAW: ptr = PyMem_RawMalloc(size); break;
    case PYMEM_DOMAIN_MEM: ptr = PyMem_Malloc(size); break;
    case PYMEM_DOMAIN_OBJ: ptr = PyObject_Malloc(size); break;
    default: ptr = NULL; break;
    }

#define CHECK_CTX(FUNC) \
    if (hook.ctx != &hook) { \
        error_msg = FUNC " wrong context"; \
        goto fail; \
    } \
    hook.ctx = NULL;  /* reset for next check */

    if (ptr == NULL) {
        error_msg = "malloc failed";
        goto fail;
    }
    CHECK_CTX("malloc");
    if (hook.malloc_size != size) {
        error_msg = "malloc invalid size";
        goto fail;
    }

    size2 = 200;
    switch(domain)
    {
    case PYMEM_DOMAIN_RAW: ptr2 = PyMem_RawRealloc(ptr, size2); break;
    case PYMEM_DOMAIN_MEM: ptr2 = PyMem_Realloc(ptr, size2); break;
    case PYMEM_DOMAIN_OBJ: ptr2 = PyObject_Realloc(ptr, size2); break;
    default: ptr2 = NULL; break;
    }

    if (ptr2 == NULL) {
        error_msg = "realloc failed";
        goto fail;
    }
    CHECK_CTX("realloc");
    if (hook.realloc_ptr != ptr
        || hook.realloc_new_size != size2) {
        error_msg = "realloc invalid parameters";
        goto fail;
    }

    switch(domain)
    {
    case PYMEM_DOMAIN_RAW: PyMem_RawFree(ptr2); break;
    case PYMEM_DOMAIN_MEM: PyMem_Free(ptr2); break;
    case PYMEM_DOMAIN_OBJ: PyObject_Free(ptr2); break;
    }

    CHECK_CTX("free");
    if (hook.free_ptr != ptr2) {
        error_msg = "free invalid pointer";
        goto fail;
    }

    /* calloc, free */
    nelem = 2;
    elsize = 5;
    switch(domain)
    {
    case PYMEM_DOMAIN_RAW: ptr = PyMem_RawCalloc(nelem, elsize); break;
    case PYMEM_DOMAIN_MEM: ptr = PyMem_Calloc(nelem, elsize); break;
    case PYMEM_DOMAIN_OBJ: ptr = PyObject_Calloc(nelem, elsize); break;
    default: ptr = NULL; break;
    }

    if (ptr == NULL) {
        error_msg = "calloc failed";
        goto fail;
    }
    CHECK_CTX("calloc");
    if (hook.calloc_nelem != nelem || hook.calloc_elsize != elsize) {
        error_msg = "calloc invalid nelem or elsize";
        goto fail;
    }

    hook.free_ptr = NULL;
    switch(domain)
    {
    case PYMEM_DOMAIN_RAW: PyMem_RawFree(ptr); break;
    case PYMEM_DOMAIN_MEM: PyMem_Free(ptr); break;
    case PYMEM_DOMAIN_OBJ: PyObject_Free(ptr); break;
    }

    CHECK_CTX("calloc free");
    if (hook.free_ptr != ptr) {
        error_msg = "calloc free invalid pointer";
        goto fail;
    }

    Py_INCREF(Py_None);
    res = Py_None;
    goto finally;

fail:
    PyErr_SetString(PyExc_RuntimeError, error_msg);

finally:
    PyMem_SetAllocator(domain, &hook.alloc);
    return res;

#undef CHECK_CTX
}

static PyObject *
test_pymem_setrawallocators(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    return test_setallocators(PYMEM_DOMAIN_RAW);
}

static PyObject *
test_pymem_setallocators(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    return test_setallocators(PYMEM_DOMAIN_MEM);
}

static PyObject *
test_pyobject_setallocators(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    return test_setallocators(PYMEM_DOMAIN_OBJ);
}

/* Most part of the following code is inherited from the pyfailmalloc project
 * written by Victor Stinner. */
static struct {
    int installed;
    PyMemAllocatorEx raw;
    PyMemAllocatorEx mem;
    PyMemAllocatorEx obj;
} FmHook;

static struct {
    int start;
    int stop;
    Py_ssize_t count;
} FmData;

static int
fm_nomemory(void)
{
    FmData.count++;
    if (FmData.count > FmData.start &&
            (FmData.stop <= 0 || FmData.count <= FmData.stop)) {
        return 1;
    }
    return 0;
}

static void *
hook_fmalloc(void *ctx, size_t size)
{
    PyMemAllocatorEx *alloc = (PyMemAllocatorEx *)ctx;
    if (fm_nomemory()) {
        return NULL;
    }
    return alloc->malloc(alloc->ctx, size);
}

static void *
hook_fcalloc(void *ctx, size_t nelem, size_t elsize)
{
    PyMemAllocatorEx *alloc = (PyMemAllocatorEx *)ctx;
    if (fm_nomemory()) {
        return NULL;
    }
    return alloc->calloc(alloc->ctx, nelem, elsize);
}

static void *
hook_frealloc(void *ctx, void *ptr, size_t new_size)
{
    PyMemAllocatorEx *alloc = (PyMemAllocatorEx *)ctx;
    if (fm_nomemory()) {
        return NULL;
    }
    return alloc->realloc(alloc->ctx, ptr, new_size);
}

static void
hook_ffree(void *ctx, void *ptr)
{
    PyMemAllocatorEx *alloc = (PyMemAllocatorEx *)ctx;
    alloc->free(alloc->ctx, ptr);
}

static void
fm_setup_hooks(void)
{
    PyMemAllocatorEx alloc;

    if (FmHook.installed) {
        return;
    }
    FmHook.installed = 1;

    alloc.malloc = hook_fmalloc;
    alloc.calloc = hook_fcalloc;
    alloc.realloc = hook_frealloc;
    alloc.free = hook_ffree;
    PyMem_GetAllocator(PYMEM_DOMAIN_RAW, &FmHook.raw);
    PyMem_GetAllocator(PYMEM_DOMAIN_MEM, &FmHook.mem);
    PyMem_GetAllocator(PYMEM_DOMAIN_OBJ, &FmHook.obj);

    alloc.ctx = &FmHook.raw;
    PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &alloc);

    alloc.ctx = &FmHook.mem;
    PyMem_SetAllocator(PYMEM_DOMAIN_MEM, &alloc);

    alloc.ctx = &FmHook.obj;
    PyMem_SetAllocator(PYMEM_DOMAIN_OBJ, &alloc);
}

static void
fm_remove_hooks(void)
{
    if (FmHook.installed) {
        FmHook.installed = 0;
        PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &FmHook.raw);
        PyMem_SetAllocator(PYMEM_DOMAIN_MEM, &FmHook.mem);
        PyMem_SetAllocator(PYMEM_DOMAIN_OBJ, &FmHook.obj);
    }
}

static PyObject*
set_nomemory(PyObject *self, PyObject *args)
{
    /* Memory allocation fails after 'start' allocation requests, and until
     * 'stop' allocation requests except when 'stop' is negative or equal
     * to 0 (default) in which case allocation failures never stop. */
    FmData.count = 0;
    FmData.stop = 0;
    if (!PyArg_ParseTuple(args, "i|i", &FmData.start, &FmData.stop)) {
        return NULL;
    }
    fm_setup_hooks();
    Py_RETURN_NONE;
}

static PyObject*
remove_mem_hooks(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    fm_remove_hooks();
    Py_RETURN_NONE;
}

PyDoc_STRVAR(docstring_empty,
""
);

PyDoc_STRVAR(docstring_no_signature,
"This docstring has no signature."
);

PyDoc_STRVAR(docstring_with_invalid_signature,
"docstring_with_invalid_signature($module, /, boo)\n"
"\n"
"This docstring has an invalid signature."
);

PyDoc_STRVAR(docstring_with_invalid_signature2,
"docstring_with_invalid_signature2($module, /, boo)\n"
"\n"
"--\n"
"\n"
"This docstring also has an invalid signature."
);

PyDoc_STRVAR(docstring_with_signature,
"docstring_with_signature($module, /, sig)\n"
"--\n"
"\n"
"This docstring has a valid signature."
);

PyDoc_STRVAR(docstring_with_signature_but_no_doc,
"docstring_with_signature_but_no_doc($module, /, sig)\n"
"--\n"
"\n"
);

PyDoc_STRVAR(docstring_with_signature_and_extra_newlines,
"docstring_with_signature_and_extra_newlines($module, /, parameter)\n"
"--\n"
"\n"
"\n"
"This docstring has a valid signature and some extra newlines."
);

PyDoc_STRVAR(docstring_with_signature_with_defaults,
"docstring_with_signature_with_defaults(module, s='avocado',\n"
"        b=b'bytes', d=3.14, i=35, n=None, t=True, f=False,\n"
"        local=the_number_three, sys=sys.maxsize,\n"
"        exp=sys.maxsize - 1)\n"
"--\n"
"\n"
"\n"
"\n"
"This docstring has a valid signature with parameters,\n"
"and the parameters take defaults of varying types."
);

typedef struct {
    PyThread_type_lock start_event;
    PyThread_type_lock exit_event;
    PyObject *callback;
} test_c_thread_t;

static void
temporary_c_thread(void *data)
{
    test_c_thread_t *test_c_thread = data;
    PyGILState_STATE state;
    PyObject *res;

    PyThread_release_lock(test_c_thread->start_event);

    /* Allocate a Python thread state for this thread */
    state = PyGILState_Ensure();

    res = PyObject_CallNoArgs(test_c_thread->callback);
    Py_CLEAR(test_c_thread->callback);

    if (res == NULL) {
        PyErr_Print();
    }
    else {
        Py_DECREF(res);
    }

    /* Destroy the Python thread state for this thread */
    PyGILState_Release(state);

    PyThread_release_lock(test_c_thread->exit_event);
}

static PyObject *
call_in_temporary_c_thread(PyObject *self, PyObject *callback)
{
    PyObject *res = NULL;
    test_c_thread_t test_c_thread;
    long thread;

    test_c_thread.start_event = PyThread_allocate_lock();
    test_c_thread.exit_event = PyThread_allocate_lock();
    test_c_thread.callback = NULL;
    if (!test_c_thread.start_event || !test_c_thread.exit_event) {
        PyErr_SetString(PyExc_RuntimeError, "could not allocate lock");
        goto exit;
    }

    Py_INCREF(callback);
    test_c_thread.callback = callback;

    PyThread_acquire_lock(test_c_thread.start_event, 1);
    PyThread_acquire_lock(test_c_thread.exit_event, 1);

    thread = PyThread_start_new_thread(temporary_c_thread, &test_c_thread);
    if (thread == -1) {
        PyErr_SetString(PyExc_RuntimeError, "unable to start the thread");
        PyThread_release_lock(test_c_thread.start_event);
        PyThread_release_lock(test_c_thread.exit_event);
        goto exit;
    }

    PyThread_acquire_lock(test_c_thread.start_event, 1);
    PyThread_release_lock(test_c_thread.start_event);

    Py_BEGIN_ALLOW_THREADS
        PyThread_acquire_lock(test_c_thread.exit_event, 1);
        PyThread_release_lock(test_c_thread.exit_event);
    Py_END_ALLOW_THREADS

    Py_INCREF(Py_None);
    res = Py_None;

exit:
    Py_CLEAR(test_c_thread.callback);
    if (test_c_thread.start_event)
        PyThread_free_lock(test_c_thread.start_event);
    if (test_c_thread.exit_event)
        PyThread_free_lock(test_c_thread.exit_event);
    return res;
}

/* marshal */

static PyObject*
pymarshal_write_long_to_file(PyObject* self, PyObject *args)
{
    long value;
    PyObject *filename;
    int version;
    FILE *fp;

    if (!PyArg_ParseTuple(args, "lOi:pymarshal_write_long_to_file",
                          &value, &filename, &version))
        return NULL;

    fp = _Py_fopen_obj(filename, "wb");
    if (fp == NULL) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }

    PyMarshal_WriteLongToFile(value, fp, version);

    fclose(fp);
    if (PyErr_Occurred())
        return NULL;
    Py_RETURN_NONE;
}

static PyObject*
pymarshal_write_object_to_file(PyObject* self, PyObject *args)
{
    PyObject *obj;
    PyObject *filename;
    int version;
    FILE *fp;

    if (!PyArg_ParseTuple(args, "OOi:pymarshal_write_object_to_file",
                          &obj, &filename, &version))
        return NULL;

    fp = _Py_fopen_obj(filename, "wb");
    if (fp == NULL) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }

    PyMarshal_WriteObjectToFile(obj, fp, version);

    fclose(fp);
    if (PyErr_Occurred())
        return NULL;
    Py_RETURN_NONE;
}

static PyObject*
pymarshal_read_short_from_file(PyObject* self, PyObject *args)
{
    int value;
    long pos;
    PyObject *filename;
    FILE *fp;

    if (!PyArg_ParseTuple(args, "O:pymarshal_read_short_from_file", &filename))
        return NULL;

    fp = _Py_fopen_obj(filename, "rb");
    if (fp == NULL) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }

    value = PyMarshal_ReadShortFromFile(fp);
    pos = ftell(fp);

    fclose(fp);
    if (PyErr_Occurred())
        return NULL;
    return Py_BuildValue("il", value, pos);
}

static PyObject*
pymarshal_read_long_from_file(PyObject* self, PyObject *args)
{
    long value, pos;
    PyObject *filename;
    FILE *fp;

    if (!PyArg_ParseTuple(args, "O:pymarshal_read_long_from_file", &filename))
        return NULL;

    fp = _Py_fopen_obj(filename, "rb");
    if (fp == NULL) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }

    value = PyMarshal_ReadLongFromFile(fp);
    pos = ftell(fp);

    fclose(fp);
    if (PyErr_Occurred())
        return NULL;
    return Py_BuildValue("ll", value, pos);
}

static PyObject*
pymarshal_read_last_object_from_file(PyObject* self, PyObject *args)
{
    PyObject *obj;
    long pos;
    PyObject *filename;
    FILE *fp;

    if (!PyArg_ParseTuple(args, "O:pymarshal_read_last_object_from_file", &filename))
        return NULL;

    fp = _Py_fopen_obj(filename, "rb");
    if (fp == NULL) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }

    obj = PyMarshal_ReadLastObjectFromFile(fp);
    pos = ftell(fp);

    fclose(fp);
    return Py_BuildValue("Nl", obj, pos);
}

static PyObject*
pymarshal_read_object_from_file(PyObject* self, PyObject *args)
{
    PyObject *obj;
    long pos;
    PyObject *filename;
    FILE *fp;

    if (!PyArg_ParseTuple(args, "O:pymarshal_read_object_from_file", &filename))
        return NULL;

    fp = _Py_fopen_obj(filename, "rb");
    if (fp == NULL) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }

    obj = PyMarshal_ReadObjectFromFile(fp);
    pos = ftell(fp);

    fclose(fp);
    return Py_BuildValue("Nl", obj, pos);
}

static PyObject*
return_null_without_error(PyObject *self, PyObject *args)
{
    /* invalid call: return NULL without setting an error,
     * _Py_CheckFunctionResult() must detect such bug at runtime. */
    PyErr_Clear();
    return NULL;
}

static PyObject*
return_result_with_error(PyObject *self, PyObject *args)
{
    /* invalid call: return a result with an error set,
     * _Py_CheckFunctionResult() must detect such bug at runtime. */
    PyErr_SetNone(PyExc_ValueError);
    Py_RETURN_NONE;
}

static PyObject*
getitem_with_error(PyObject *self, PyObject *args)
{
    PyObject *map, *key;
    if (!PyArg_ParseTuple(args, "OO", &map, &key)) {
        return NULL;
    }

    PyErr_SetString(PyExc_ValueError, "bug");
    return PyObject_GetItem(map, key);
}

static PyObject *
test_pytime_fromseconds(PyObject *self, PyObject *args)
{
    int seconds;
    if (!PyArg_ParseTuple(args, "i", &seconds)) {
        return NULL;
    }
    _PyTime_t ts = _PyTime_FromSeconds(seconds);
    return _PyTime_AsNanosecondsObject(ts);
}

static PyObject *
test_pytime_fromsecondsobject(PyObject *self, PyObject *args)
{
    PyObject *obj;
    int round;
    if (!PyArg_ParseTuple(args, "Oi", &obj, &round)) {
        return NULL;
    }
    if (check_time_rounding(round) < 0) {
        return NULL;
    }
    _PyTime_t ts;
    if (_PyTime_FromSecondsObject(&ts, obj, round) == -1) {
        return NULL;
    }
    return _PyTime_AsNanosecondsObject(ts);
}

static PyObject *
test_pytime_assecondsdouble(PyObject *self, PyObject *args)
{
    PyObject *obj;
    if (!PyArg_ParseTuple(args, "O", &obj)) {
        return NULL;
    }
    _PyTime_t ts;
    if (_PyTime_FromNanosecondsObject(&ts, obj) < 0) {
        return NULL;
    }
    double d = _PyTime_AsSecondsDouble(ts);
    return PyFloat_FromDouble(d);
}

static PyObject *
test_PyTime_AsTimeval(PyObject *self, PyObject *args)
{
    PyObject *obj;
    int round;
    if (!PyArg_ParseTuple(args, "Oi", &obj, &round)) {
        return NULL;
    }
    if (check_time_rounding(round) < 0) {
        return NULL;
    }
    _PyTime_t t;
    if (_PyTime_FromNanosecondsObject(&t, obj) < 0) {
        return NULL;
    }
    struct timeval tv;
    if (_PyTime_AsTimeval(t, &tv, round) < 0) {
        return NULL;
    }

    PyObject *seconds = PyLong_FromLongLong(tv.tv_sec);
    if (seconds == NULL) {
        return NULL;
    }
    return Py_BuildValue("Nl", seconds, (long)tv.tv_usec);
}

static PyObject *
test_PyTime_AsTimeval_clamp(PyObject *self, PyObject *args)
{
    PyObject *obj;
    int round;
    if (!PyArg_ParseTuple(args, "Oi", &obj, &round)) {
        return NULL;
    }
    if (check_time_rounding(round) < 0) {
        return NULL;
    }
    _PyTime_t t;
    if (_PyTime_FromNanosecondsObject(&t, obj) < 0) {
        return NULL;
    }
    struct timeval tv;
    _PyTime_AsTimeval_clamp(t, &tv, round);

    PyObject *seconds = PyLong_FromLongLong(tv.tv_sec);
    if (seconds == NULL) {
        return NULL;
    }
    return Py_BuildValue("Nl", seconds, (long)tv.tv_usec);
}

#ifdef HAVE_CLOCK_GETTIME
static PyObject *
test_PyTime_AsTimespec(PyObject *self, PyObject *args)
{
    PyObject *obj;
    if (!PyArg_ParseTuple(args, "O", &obj)) {
        return NULL;
    }
    _PyTime_t t;
    if (_PyTime_FromNanosecondsObject(&t, obj) < 0) {
        return NULL;
    }
    struct timespec ts;
    if (_PyTime_AsTimespec(t, &ts) == -1) {
        return NULL;
    }
    return Py_BuildValue("Nl", _PyLong_FromTime_t(ts.tv_sec), ts.tv_nsec);
}

static PyObject *
test_PyTime_AsTimespec_clamp(PyObject *self, PyObject *args)
{
    PyObject *obj;
    if (!PyArg_ParseTuple(args, "O", &obj)) {
        return NULL;
    }
    _PyTime_t t;
    if (_PyTime_FromNanosecondsObject(&t, obj) < 0) {
        return NULL;
    }
    struct timespec ts;
    _PyTime_AsTimespec_clamp(t, &ts);
    return Py_BuildValue("Nl", _PyLong_FromTime_t(ts.tv_sec), ts.tv_nsec);
}
#endif

static PyObject *
test_PyTime_AsMilliseconds(PyObject *self, PyObject *args)
{
    PyObject *obj;
    int round;
    if (!PyArg_ParseTuple(args, "Oi", &obj, &round)) {
        return NULL;
    }
    _PyTime_t t;
    if (_PyTime_FromNanosecondsObject(&t, obj) < 0) {
        return NULL;
    }
    if (check_time_rounding(round) < 0) {
        return NULL;
    }
    _PyTime_t ms = _PyTime_AsMilliseconds(t, round);
    _PyTime_t ns = _PyTime_FromNanoseconds(ms);
    return _PyTime_AsNanosecondsObject(ns);
}

static PyObject *
test_PyTime_AsMicroseconds(PyObject *self, PyObject *args)
{
    PyObject *obj;
    int round;
    if (!PyArg_ParseTuple(args, "Oi", &obj, &round)) {
        return NULL;
    }
    _PyTime_t t;
    if (_PyTime_FromNanosecondsObject(&t, obj) < 0) {
        return NULL;
    }
    if (check_time_rounding(round) < 0) {
        return NULL;
    }
    _PyTime_t us = _PyTime_AsMicroseconds(t, round);
    _PyTime_t ns = _PyTime_FromNanoseconds(us);
    return _PyTime_AsNanosecondsObject(ns);
}

static PyObject*
pymem_buffer_overflow(PyObject *self, PyObject *args)
{
    char *buffer;

    /* Deliberate buffer overflow to check that PyMem_Free() detects
       the overflow when debug hooks are installed. */
    buffer = PyMem_Malloc(16);
    if (buffer == NULL) {
        PyErr_NoMemory();
        return NULL;
    }
    buffer[16] = 'x';
    PyMem_Free(buffer);

    Py_RETURN_NONE;
}

static PyObject*
pymem_api_misuse(PyObject *self, PyObject *args)
{
    char *buffer;

    /* Deliberate misusage of Python allocators:
       allococate with PyMem but release with PyMem_Raw. */
    buffer = PyMem_Malloc(16);
    PyMem_RawFree(buffer);

    Py_RETURN_NONE;
}

static PyObject*
pymem_malloc_without_gil(PyObject *self, PyObject *args)
{
    char *buffer;

    /* Deliberate bug to test debug hooks on Python memory allocators:
       call PyMem_Malloc() without holding the GIL */
    Py_BEGIN_ALLOW_THREADS
    buffer = PyMem_Malloc(10);
    Py_END_ALLOW_THREADS

    PyMem_Free(buffer);

    Py_RETURN_NONE;
}


static PyObject*
test_pymem_getallocatorsname(PyObject *self, PyObject *args)
{
    const char *name = _PyMem_GetCurrentAllocatorName();
    if (name == NULL) {
        PyErr_SetString(PyExc_RuntimeError, "cannot get allocators name");
        return NULL;
    }
    return PyUnicode_FromString(name);
}


static PyObject*
test_pyobject_is_freed(const char *test_name, PyObject *op)
{
    if (!_PyObject_IsFreed(op)) {
        return raiseTestError(test_name, "object is not seen as freed");
    }
    Py_RETURN_NONE;
}


static PyObject*
check_pyobject_null_is_freed(PyObject *self, PyObject *Py_UNUSED(args))
{
    PyObject *op = NULL;
    return test_pyobject_is_freed("check_pyobject_null_is_freed", op);
}


static PyObject*
check_pyobject_uninitialized_is_freed(PyObject *self, PyObject *Py_UNUSED(args))
{
    PyObject *op = (PyObject *)PyObject_Malloc(sizeof(PyObject));
    if (op == NULL) {
        return NULL;
    }
    /* Initialize reference count to avoid early crash in ceval or GC */
    Py_SET_REFCNT(op, 1);
    /* object fields like ob_type are uninitialized! */
    return test_pyobject_is_freed("check_pyobject_uninitialized_is_freed", op);
}


static PyObject*
check_pyobject_forbidden_bytes_is_freed(PyObject *self, PyObject *Py_UNUSED(args))
{
    /* Allocate an incomplete PyObject structure: truncate 'ob_type' field */
    PyObject *op = (PyObject *)PyObject_Malloc(offsetof(PyObject, ob_type));
    if (op == NULL) {
        return NULL;
    }
    /* Initialize reference count to avoid early crash in ceval or GC */
    Py_SET_REFCNT(op, 1);
    /* ob_type field is after the memory block: part of "forbidden bytes"
       when using debug hooks on memory allocators! */
    return test_pyobject_is_freed("check_pyobject_forbidden_bytes_is_freed", op);
}


static PyObject*
check_pyobject_freed_is_freed(PyObject *self, PyObject *Py_UNUSED(args))
{
    /* This test would fail if run with the address sanitizer */
#ifdef _Py_ADDRESS_SANITIZER
    Py_RETURN_NONE;
#else
    PyObject *op = PyObject_CallNoArgs((PyObject *)&PyBaseObject_Type);
    if (op == NULL) {
        return NULL;
    }
    Py_TYPE(op)->tp_dealloc(op);
    /* Reset reference count to avoid early crash in ceval or GC */
    Py_SET_REFCNT(op, 1);
    /* object memory is freed! */
    return test_pyobject_is_freed("check_pyobject_freed_is_freed", op);
#endif
}


static PyObject*
pyobject_malloc_without_gil(PyObject *self, PyObject *args)
{
    char *buffer;

    /* Deliberate bug to test debug hooks on Python memory allocators:
       call PyObject_Malloc() without holding the GIL */
    Py_BEGIN_ALLOW_THREADS
    buffer = PyObject_Malloc(10);
    Py_END_ALLOW_THREADS

    PyObject_Free(buffer);

    Py_RETURN_NONE;
}

static PyObject *
tracemalloc_track(PyObject *self, PyObject *args)
{
    unsigned int domain;
    PyObject *ptr_obj;
    void *ptr;
    Py_ssize_t size;
    int release_gil = 0;
    int res;

    if (!PyArg_ParseTuple(args, "IOn|i", &domain, &ptr_obj, &size, &release_gil))
        return NULL;
    ptr = PyLong_AsVoidPtr(ptr_obj);
    if (PyErr_Occurred())
        return NULL;

    if (release_gil) {
        Py_BEGIN_ALLOW_THREADS
        res = PyTraceMalloc_Track(domain, (uintptr_t)ptr, size);
        Py_END_ALLOW_THREADS
    }
    else {
        res = PyTraceMalloc_Track(domain, (uintptr_t)ptr, size);
    }

    if (res < 0) {
        PyErr_SetString(PyExc_RuntimeError, "PyTraceMalloc_Track error");
        return NULL;
    }

    Py_RETURN_NONE;
}

static PyObject *
tracemalloc_untrack(PyObject *self, PyObject *args)
{
    unsigned int domain;
    PyObject *ptr_obj;
    void *ptr;
    int res;

    if (!PyArg_ParseTuple(args, "IO", &domain, &ptr_obj))
        return NULL;
    ptr = PyLong_AsVoidPtr(ptr_obj);
    if (PyErr_Occurred())
        return NULL;

    res = PyTraceMalloc_Untrack(domain, (uintptr_t)ptr);
    if (res < 0) {
        PyErr_SetString(PyExc_RuntimeError, "PyTraceMalloc_Untrack error");
        return NULL;
    }

    Py_RETURN_NONE;
}

static PyObject *
tracemalloc_get_traceback(PyObject *self, PyObject *args)
{
    unsigned int domain;
    PyObject *ptr_obj;
    void *ptr;

    if (!PyArg_ParseTuple(args, "IO", &domain, &ptr_obj))
        return NULL;
    ptr = PyLong_AsVoidPtr(ptr_obj);
    if (PyErr_Occurred())
        return NULL;

    return _PyTraceMalloc_GetTraceback(domain, (uintptr_t)ptr);
}

static PyObject *
dict_get_version(PyObject *self, PyObject *args)
{
    PyDictObject *dict;
    uint64_t version;

    if (!PyArg_ParseTuple(args, "O!", &PyDict_Type, &dict))
        return NULL;

    version = dict->ma_version_tag;

    Py_BUILD_ASSERT(sizeof(unsigned long long) >= sizeof(version));
    return PyLong_FromUnsignedLongLong((unsigned long long)version);
}


static PyObject *
raise_SIGINT_then_send_None(PyObject *self, PyObject *args)
{
    _Py_IDENTIFIER(send);
    PyGenObject *gen;

    if (!PyArg_ParseTuple(args, "O!", &PyGen_Type, &gen))
        return NULL;

    /* This is used in a test to check what happens if a signal arrives just
       as we're in the process of entering a yield from chain (see
       bpo-30039).

       Needs to be done in C, because:
       - we don't have a Python wrapper for raise()
       - we need to make sure that the Python-level signal handler doesn't run
         *before* we enter the generator frame, which is impossible in Python
         because we check for signals before every bytecode operation.
     */
    raise(SIGINT);
    return _PyObject_CallMethodIdOneArg((PyObject *)gen, &PyId_send, Py_None);
}


static int
fastcall_args(PyObject *args, PyObject ***stack, Py_ssize_t *nargs)
{
    if (args == Py_None) {
        *stack = NULL;
        *nargs = 0;
    }
    else if (PyTuple_Check(args)) {
        *stack = ((PyTupleObject *)args)->ob_item;
        *nargs = PyTuple_GET_SIZE(args);
    }
    else {
        PyErr_SetString(PyExc_TypeError, "args must be None or a tuple");
        return -1;
    }
    return 0;
}


static PyObject *
test_pyobject_fastcall(PyObject *self, PyObject *args)
{
    PyObject *func, *func_args;
    PyObject **stack;
    Py_ssize_t nargs;

    if (!PyArg_ParseTuple(args, "OO", &func, &func_args)) {
        return NULL;
    }

    if (fastcall_args(func_args, &stack, &nargs) < 0) {
        return NULL;
    }
    return _PyObject_FastCall(func, stack, nargs);
}


static PyObject *
test_pyobject_fastcalldict(PyObject *self, PyObject *args)
{
    PyObject *func, *func_args, *kwargs;
    PyObject **stack;
    Py_ssize_t nargs;

    if (!PyArg_ParseTuple(args, "OOO", &func, &func_args, &kwargs)) {
        return NULL;
    }

    if (fastcall_args(func_args, &stack, &nargs) < 0) {
        return NULL;
    }

    if (kwargs == Py_None) {
        kwargs = NULL;
    }
    else if (!PyDict_Check(kwargs)) {
        PyErr_SetString(PyExc_TypeError, "kwnames must be None or a dict");
        return NULL;
    }

    return PyObject_VectorcallDict(func, stack, nargs, kwargs);
}


static PyObject *
test_pyobject_vectorcall(PyObject *self, PyObject *args)
{
    PyObject *func, *func_args, *kwnames = NULL;
    PyObject **stack;
    Py_ssize_t nargs, nkw;

    if (!PyArg_ParseTuple(args, "OOO", &func, &func_args, &kwnames)) {
        return NULL;
    }

    if (fastcall_args(func_args, &stack, &nargs) < 0) {
        return NULL;
    }

    if (kwnames == Py_None) {
        kwnames = NULL;
    }
    else if (PyTuple_Check(kwnames)) {
        nkw = PyTuple_GET_SIZE(kwnames);
        if (nargs < nkw) {
            PyErr_SetString(PyExc_ValueError, "kwnames longer than args");
            return NULL;
        }
        nargs -= nkw;
    }
    else {
        PyErr_SetString(PyExc_TypeError, "kwnames must be None or a tuple");
        return NULL;
    }
    return PyObject_Vectorcall(func, stack, nargs, kwnames);
}


static PyObject *
test_pyvectorcall_call(PyObject *self, PyObject *args)
{
    PyObject *func;
    PyObject *argstuple;
    PyObject *kwargs = NULL;

    if (!PyArg_ParseTuple(args, "OO|O", &func, &argstuple, &kwargs)) {
        return NULL;
    }

    if (!PyTuple_Check(argstuple)) {
        PyErr_SetString(PyExc_TypeError, "args must be a tuple");
        return NULL;
    }
    if (kwargs != NULL && !PyDict_Check(kwargs)) {
        PyErr_SetString(PyExc_TypeError, "kwargs must be a dict");
        return NULL;
    }

    return PyVectorcall_Call(func, argstuple, kwargs);
}


static PyObject*
stack_pointer(PyObject *self, PyObject *args)
{
    int v = 5;
    return PyLong_FromVoidPtr(&v);
}


#ifdef W_STOPCODE
static PyObject*
py_w_stopcode(PyObject *self, PyObject *args)
{
    int sig, status;
    if (!PyArg_ParseTuple(args, "i", &sig)) {
        return NULL;
    }
    status = W_STOPCODE(sig);
    return PyLong_FromLong(status);
}
#endif


static PyObject *
get_mapping_keys(PyObject* self, PyObject *obj)
{
    return PyMapping_Keys(obj);
}

static PyObject *
get_mapping_values(PyObject* self, PyObject *obj)
{
    return PyMapping_Values(obj);
}

static PyObject *
get_mapping_items(PyObject* self, PyObject *obj)
{
    return PyMapping_Items(obj);
}


static PyObject *
test_pythread_tss_key_state(PyObject *self, PyObject *args)
{
    Py_tss_t tss_key = Py_tss_NEEDS_INIT;
    if (PyThread_tss_is_created(&tss_key)) {
        return raiseTestError("test_pythread_tss_key_state",
                              "TSS key not in an uninitialized state at "
                              "creation time");
    }
    if (PyThread_tss_create(&tss_key) != 0) {
        PyErr_SetString(PyExc_RuntimeError, "PyThread_tss_create failed");
        return NULL;
    }
    if (!PyThread_tss_is_created(&tss_key)) {
        return raiseTestError("test_pythread_tss_key_state",
                              "PyThread_tss_create succeeded, "
                              "but with TSS key in an uninitialized state");
    }
    if (PyThread_tss_create(&tss_key) != 0) {
        return raiseTestError("test_pythread_tss_key_state",
                              "PyThread_tss_create unsuccessful with "
                              "an already initialized key");
    }
#define CHECK_TSS_API(expr) \
        (void)(expr); \
        if (!PyThread_tss_is_created(&tss_key)) { \
            return raiseTestError("test_pythread_tss_key_state", \
                                  "TSS key initialization state was not " \
                                  "preserved after calling " #expr); }
    CHECK_TSS_API(PyThread_tss_set(&tss_key, NULL));
    CHECK_TSS_API(PyThread_tss_get(&tss_key));
#undef CHECK_TSS_API
    PyThread_tss_delete(&tss_key);
    if (PyThread_tss_is_created(&tss_key)) {
        return raiseTestError("test_pythread_tss_key_state",
                              "PyThread_tss_delete called, but did not "
                              "set the key state to uninitialized");
    }

    Py_tss_t *ptr_key = PyThread_tss_alloc();
    if (ptr_key == NULL) {
        PyErr_SetString(PyExc_RuntimeError, "PyThread_tss_alloc failed");
        return NULL;
    }
    if (PyThread_tss_is_created(ptr_key)) {
        return raiseTestError("test_pythread_tss_key_state",
                              "TSS key not in an uninitialized state at "
                              "allocation time");
    }
    PyThread_tss_free(ptr_key);
    ptr_key = NULL;
    Py_RETURN_NONE;
}


static PyObject*
new_hamt(PyObject *self, PyObject *args)
{
    return _PyContext_NewHamtForTests();
}


/* def bad_get(self, obj, cls):
       cls()
       return repr(self)
*/
static PyObject*
bad_get(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
{
    PyObject *self, *obj, *cls;
    if (!_PyArg_UnpackStack(args, nargs, "bad_get", 3, 3, &self, &obj, &cls)) {
        return NULL;
    }

    PyObject *res = PyObject_CallNoArgs(cls);
    if (res == NULL) {
        return NULL;
    }
    Py_DECREF(res);

    return PyObject_Repr(self);
}


#ifdef Py_REF_DEBUG
static PyObject *
negative_refcount(PyObject *self, PyObject *Py_UNUSED(args))
{
    PyObject *obj = PyUnicode_FromString("negative_refcount");
    if (obj == NULL) {
        return NULL;
    }
    assert(Py_REFCNT(obj) == 1);

    Py_SET_REFCNT(obj,  0);
    /* Py_DECREF() must call _Py_NegativeRefcount() and abort Python */
    Py_DECREF(obj);

    Py_RETURN_NONE;
}
#endif


static PyObject*
test_write_unraisable_exc(PyObject *self, PyObject *args)
{
    PyObject *exc, *err_msg, *obj;
    if (!PyArg_ParseTuple(args, "OOO", &exc, &err_msg, &obj)) {
        return NULL;
    }

    const char *err_msg_utf8;
    if (err_msg != Py_None) {
        err_msg_utf8 = PyUnicode_AsUTF8(err_msg);
        if (err_msg_utf8 == NULL) {
            return NULL;
        }
    }
    else {
        err_msg_utf8 = NULL;
    }

    PyErr_SetObject((PyObject *)Py_TYPE(exc), exc);
    _PyErr_WriteUnraisableMsg(err_msg_utf8, obj);
    Py_RETURN_NONE;
}


static PyObject *
sequence_getitem(PyObject *self, PyObject *args)
{
    PyObject *seq;
    Py_ssize_t i;
    if (!PyArg_ParseTuple(args, "On", &seq, &i)) {
        return NULL;
    }
    return PySequence_GetItem(seq, i);
}


/* Functions for testing C calling conventions (METH_*) are named meth_*,
 * e.g. "meth_varargs" for METH_VARARGS.
 *
 * They all return a tuple of their C-level arguments, with None instead
 * of NULL and Python tuples instead of C arrays.
 */


static PyObject*
_null_to_none(PyObject* obj)
{
    if (obj == NULL) {
        Py_RETURN_NONE;
    }
    Py_INCREF(obj);
    return obj;
}

static PyObject*
meth_varargs(PyObject* self, PyObject* args)
{
    return Py_BuildValue("NO", _null_to_none(self), args);
}

static PyObject*
meth_varargs_keywords(PyObject* self, PyObject* args, PyObject* kwargs)
{
    return Py_BuildValue("NON", _null_to_none(self), args, _null_to_none(kwargs));
}

static PyObject*
meth_o(PyObject* self, PyObject* obj)
{
    return Py_BuildValue("NO", _null_to_none(self), obj);
}

static PyObject*
meth_noargs(PyObject* self, PyObject* ignored)
{
    return _null_to_none(self);
}

static PyObject*
_fastcall_to_tuple(PyObject* const* args, Py_ssize_t nargs)
{
    PyObject *tuple = PyTuple_New(nargs);
    if (tuple == NULL) {
        return NULL;
    }
    for (Py_ssize_t i=0; i < nargs; i++) {
        Py_INCREF(args[i]);
        PyTuple_SET_ITEM(tuple, i, args[i]);
    }
    return tuple;
}

static PyObject*
meth_fastcall(PyObject* self, PyObject* const* args, Py_ssize_t nargs)
{
    return Py_BuildValue(
        "NN", _null_to_none(self), _fastcall_to_tuple(args, nargs)
    );
}

static PyObject*
meth_fastcall_keywords(PyObject* self, PyObject* const* args,
                       Py_ssize_t nargs, PyObject* kwargs)
{
    PyObject *pyargs = _fastcall_to_tuple(args, nargs);
    if (pyargs == NULL) {
        return NULL;
    }
    PyObject *pykwargs = PyObject_Vectorcall((PyObject*)&PyDict_Type,
                                              args + nargs, 0, kwargs);
    return Py_BuildValue("NNN", _null_to_none(self), pyargs, pykwargs);
}


static PyObject*
pynumber_tobase(PyObject *module, PyObject *args)
{
    PyObject *obj;
    int base;
    if (!PyArg_ParseTuple(args, "Oi:pynumber_tobase",
                          &obj, &base)) {
        return NULL;
    }
    return PyNumber_ToBase(obj, base);
}


static PyObject*
test_set_type_size(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *obj = PyList_New(0);
    if (obj == NULL) {
        return NULL;
    }

    // Ensure that following tests don't modify the object,
    // to ensure that Py_DECREF() will not crash.
    assert(Py_TYPE(obj) == &PyList_Type);
    assert(Py_SIZE(obj) == 0);

    // bpo-39573: Test Py_SET_TYPE() and Py_SET_SIZE() functions.
    Py_SET_TYPE(obj, &PyList_Type);
    Py_SET_SIZE(obj, 0);

    Py_DECREF(obj);
    Py_RETURN_NONE;
}


#define TEST_REFCOUNT() \
    do { \
        PyObject *obj = PyList_New(0); \
        if (obj == NULL) { \
            return NULL; \
        } \
        assert(Py_REFCNT(obj) == 1); \
        \
        /* test Py_NewRef() */ \
        PyObject *ref = Py_NewRef(obj); \
        assert(ref == obj); \
        assert(Py_REFCNT(obj) == 2); \
        Py_DECREF(ref); \
        \
        /* test Py_XNewRef() */ \
        PyObject *xref = Py_XNewRef(obj); \
        assert(xref == obj); \
        assert(Py_REFCNT(obj) == 2); \
        Py_DECREF(xref); \
        \
        assert(Py_XNewRef(NULL) == NULL); \
        \
        Py_DECREF(obj); \
        Py_RETURN_NONE; \
    } while (0) \


// Test Py_NewRef() and Py_XNewRef() macros
static PyObject*
test_refcount_macros(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    TEST_REFCOUNT();
}

#undef Py_NewRef
#undef Py_XNewRef

// Test Py_NewRef() and Py_XNewRef() functions, after undefining macros.
static PyObject*
test_refcount_funcs(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    TEST_REFCOUNT();
}


// Test Py_Is() function
#define TEST_PY_IS() \
    do { \
        PyObject *o_none = Py_None; \
        PyObject *o_true = Py_True; \
        PyObject *o_false = Py_False; \
        PyObject *obj = PyList_New(0); \
        if (obj == NULL) { \
            return NULL; \
        } \
        \
        /* test Py_Is() */ \
        assert(Py_Is(obj, obj)); \
        assert(!Py_Is(obj, o_none)); \
        \
        /* test Py_None */ \
        assert(Py_Is(o_none, o_none)); \
        assert(!Py_Is(obj, o_none)); \
        \
        /* test Py_True */ \
        assert(Py_Is(o_true, o_true)); \
        assert(!Py_Is(o_false, o_true)); \
        assert(!Py_Is(obj, o_true)); \
        \
        /* test Py_False */ \
        assert(Py_Is(o_false, o_false)); \
        assert(!Py_Is(o_true, o_false)); \
        assert(!Py_Is(obj, o_false)); \
        \
        Py_DECREF(obj); \
        Py_RETURN_NONE; \
    } while (0)

// Test Py_Is() macro
static PyObject*
test_py_is_macros(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    TEST_PY_IS();
}

#undef Py_Is

// Test Py_Is() function, after undefining its macro.
static PyObject*
test_py_is_funcs(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    TEST_PY_IS();
}


static PyObject *
test_fatal_error(PyObject *self, PyObject *args)
{
    char *message;
    int release_gil = 0;
    if (!PyArg_ParseTuple(args, "y|i:fatal_error", &message, &release_gil))
        return NULL;
    if (release_gil) {
        Py_BEGIN_ALLOW_THREADS
        Py_FatalError(message);
        Py_END_ALLOW_THREADS
    }
    else {
        Py_FatalError(message);
    }
    // Py_FatalError() does not return, but exits the process.
    Py_RETURN_NONE;
}

// type->tp_version_tag
static PyObject *
type_get_version(PyObject *self, PyObject *type)
{
    if (!PyType_Check(type)) {
        PyErr_SetString(PyExc_TypeError, "argument must be a type");
        return NULL;
    }
    PyObject *res = PyLong_FromUnsignedLong(
        ((PyTypeObject *)type)->tp_version_tag);
    if (res == NULL) {
        assert(PyErr_Occurred());
        return NULL;
    }
    return res;
}


// Test PyThreadState C API
static PyObject *
test_tstate_capi(PyObject *self, PyObject *Py_UNUSED(args))
{
    // PyThreadState_Get()
    PyThreadState *tstate = PyThreadState_Get();
    assert(tstate != NULL);

    // PyThreadState_GET()
    PyThreadState *tstate2 = PyThreadState_Get();
    assert(tstate2 == tstate);

    // private _PyThreadState_UncheckedGet()
    PyThreadState *tstate3 = _PyThreadState_UncheckedGet();
    assert(tstate3 == tstate);

    // PyThreadState_EnterTracing(), PyThreadState_LeaveTracing()
    PyThreadState_EnterTracing(tstate);
    PyThreadState_LeaveTracing(tstate);

    // PyThreadState_GetDict(): no tstate argument
    PyObject *dict = PyThreadState_GetDict();
    // PyThreadState_GetDict() API can return NULL if PyDict_New() fails,
    // but it should not occur in practice.
    assert(dict != NULL);
    assert(PyDict_Check(dict));
    // dict is a borrowed reference

    // private _PyThreadState_GetDict()
    PyObject *dict2 = _PyThreadState_GetDict(tstate);
    assert(dict2 == dict);
    // dict2 is a borrowed reference

    // PyThreadState_GetInterpreter()
    PyInterpreterState *interp = PyThreadState_GetInterpreter(tstate);
    assert(interp != NULL);

    // PyThreadState_GetFrame()
    PyFrameObject*frame = PyThreadState_GetFrame(tstate);
    assert(frame != NULL);
    assert(PyFrame_Check(frame));
    Py_DECREF(frame);

    // PyThreadState_GetID()
    uint64_t id = PyThreadState_GetID(tstate);
    assert(id >= 1);

    Py_RETURN_NONE;
}


static PyObject *negative_dictoffset(PyObject *, PyObject *);
static PyObject *test_buildvalue_issue38913(PyObject *, PyObject *);
static PyObject *getargs_s_hash_int(PyObject *, PyObject *, PyObject*);

static PyMethodDef TestMethods[] = {
    {"raise_exception",         raise_exception,                 METH_VARARGS},
    {"raise_memoryerror",       raise_memoryerror,               METH_NOARGS},
    {"set_errno",               set_errno,                       METH_VARARGS},
    {"test_config",             test_config,                     METH_NOARGS},
    {"test_sizeof_c_types",     test_sizeof_c_types,             METH_NOARGS},
    {"test_datetime_capi",      test_datetime_capi,              METH_NOARGS},
    {"datetime_check_date",     datetime_check_date,             METH_VARARGS},
    {"datetime_check_time",     datetime_check_time,             METH_VARARGS},
    {"datetime_check_datetime",     datetime_check_datetime,     METH_VARARGS},
    {"datetime_check_delta",     datetime_check_delta,           METH_VARARGS},
    {"datetime_check_tzinfo",     datetime_check_tzinfo,         METH_VARARGS},
    {"make_timezones_capi",     make_timezones_capi,             METH_NOARGS},
    {"get_timezones_offset_zero",   get_timezones_offset_zero,   METH_NOARGS},
    {"get_timezone_utc_capi",    get_timezone_utc_capi,          METH_VARARGS},
    {"get_date_fromdate",        get_date_fromdate,              METH_VARARGS},
    {"get_datetime_fromdateandtime", get_datetime_fromdateandtime, METH_VARARGS},
    {"get_datetime_fromdateandtimeandfold", get_datetime_fromdateandtimeandfold, METH_VARARGS},
    {"get_time_fromtime",        get_time_fromtime,              METH_VARARGS},
    {"get_time_fromtimeandfold", get_time_fromtimeandfold,       METH_VARARGS},
    {"get_delta_fromdsu",        get_delta_fromdsu,              METH_VARARGS},
    {"get_date_fromtimestamp",   get_date_fromtimestamp,         METH_VARARGS},
    {"get_datetime_fromtimestamp", get_datetime_fromtimestamp,   METH_VARARGS},
    {"PyDateTime_GET",             test_PyDateTime_GET,           METH_O},
    {"PyDateTime_DATE_GET",        test_PyDateTime_DATE_GET,      METH_O},
    {"PyDateTime_TIME_GET",        test_PyDateTime_TIME_GET,      METH_O},
    {"PyDateTime_DELTA_GET",       test_PyDateTime_DELTA_GET,     METH_O},
    {"test_gc_control",         test_gc_control,                 METH_NOARGS},
    {"test_list_api",           test_list_api,                   METH_NOARGS},
    {"test_dict_iteration",     test_dict_iteration,             METH_NOARGS},
    {"dict_getitem_knownhash",  dict_getitem_knownhash,          METH_VARARGS},
    {"test_lazy_hash_inheritance",      test_lazy_hash_inheritance,METH_NOARGS},
    {"test_long_api",           test_long_api,                   METH_NOARGS},
    {"test_xincref_doesnt_leak",test_xincref_doesnt_leak,        METH_NOARGS},
    {"test_incref_doesnt_leak", test_incref_doesnt_leak,         METH_NOARGS},
    {"test_xdecref_doesnt_leak",test_xdecref_doesnt_leak,        METH_NOARGS},
    {"test_decref_doesnt_leak", test_decref_doesnt_leak,         METH_NOARGS},
    {"test_structseq_newtype_doesnt_leak",
        test_structseq_newtype_doesnt_leak, METH_NOARGS},
    {"test_structseq_newtype_null_descr_doc",
        test_structseq_newtype_null_descr_doc, METH_NOARGS},
    {"test_incref_decref_API",  test_incref_decref_API,          METH_NOARGS},
    {"test_long_and_overflow",  test_long_and_overflow,          METH_NOARGS},
    {"test_long_as_double",     test_long_as_double,             METH_NOARGS},
    {"test_long_as_size_t",     test_long_as_size_t,             METH_NOARGS},
    {"test_long_as_unsigned_long_long_mask",
        test_long_as_unsigned_long_long_mask, METH_NOARGS},
    {"test_long_numbits",       test_long_numbits,               METH_NOARGS},
    {"test_k_code",             test_k_code,                     METH_NOARGS},
    {"test_empty_argparse",     test_empty_argparse,             METH_NOARGS},
    {"parse_tuple_and_keywords", parse_tuple_and_keywords, METH_VARARGS},
    {"pyobject_repr_from_null", pyobject_repr_from_null, METH_NOARGS},
    {"pyobject_str_from_null",  pyobject_str_from_null, METH_NOARGS},
    {"pyobject_bytes_from_null", pyobject_bytes_from_null, METH_NOARGS},
    {"test_string_from_format", (PyCFunction)test_string_from_format, METH_NOARGS},
    {"test_with_docstring",     test_with_docstring,             METH_NOARGS,
     PyDoc_STR("This is a pretty normal docstring.")},
    {"test_string_to_double",   test_string_to_double,           METH_NOARGS},
    {"test_unicode_compare_with_ascii", test_unicode_compare_with_ascii,
     METH_NOARGS},
    {"test_capsule", (PyCFunction)test_capsule, METH_NOARGS},
    {"test_from_contiguous", (PyCFunction)test_from_contiguous, METH_NOARGS},
#if (defined(__linux__) || defined(__FreeBSD__)) && defined(__GNUC__)
    {"test_pep3118_obsolete_write_locks", (PyCFunction)test_pep3118_obsolete_write_locks, METH_NOARGS},
#endif
    {"getbuffer_with_null_view", getbuffer_with_null_view,       METH_O},
    {"PyBuffer_SizeFromFormat",  test_PyBuffer_SizeFromFormat,   METH_VARARGS},
    {"test_buildvalue_N",        test_buildvalue_N,              METH_NOARGS},
    {"negative_dictoffset",      negative_dictoffset,            METH_NOARGS},
    {"test_buildvalue_issue38913", test_buildvalue_issue38913,   METH_NOARGS},
    {"get_args",                  get_args,                      METH_VARARGS},
    {"test_get_statictype_slots", test_get_statictype_slots,     METH_NOARGS},
    {"test_get_type_name",        test_get_type_name,            METH_NOARGS},
    {"test_get_type_qualname",    test_get_type_qualname,        METH_NOARGS},
    {"test_type_from_ephemeral_spec", test_type_from_ephemeral_spec, METH_NOARGS},
    {"get_kwargs", (PyCFunction)(void(*)(void))get_kwargs,
      METH_VARARGS|METH_KEYWORDS},
    {"getargs_tuple",           getargs_tuple,                   METH_VARARGS},
    {"getargs_keywords", (PyCFunction)(void(*)(void))getargs_keywords,
      METH_VARARGS|METH_KEYWORDS},
    {"getargs_keyword_only", (PyCFunction)(void(*)(void))getargs_keyword_only,
      METH_VARARGS|METH_KEYWORDS},
    {"getargs_positional_only_and_keywords",
      (PyCFunction)(void(*)(void))getargs_positional_only_and_keywords,
      METH_VARARGS|METH_KEYWORDS},
    {"getargs_b",               getargs_b,                       METH_VARARGS},
    {"getargs_B",               getargs_B,                       METH_VARARGS},
    {"getargs_h",               getargs_h,                       METH_VARARGS},
    {"getargs_H",               getargs_H,                       METH_VARARGS},
    {"getargs_I",               getargs_I,                       METH_VARARGS},
    {"getargs_k",               getargs_k,                       METH_VARARGS},
    {"getargs_i",               getargs_i,                       METH_VARARGS},
    {"getargs_l",               getargs_l,                       METH_VARARGS},
    {"getargs_n",               getargs_n,                       METH_VARARGS},
    {"getargs_p",               getargs_p,                       METH_VARARGS},
    {"getargs_L",               getargs_L,                       METH_VARARGS},
    {"getargs_K",               getargs_K,                       METH_VARARGS},
    {"test_longlong_api",       test_longlong_api,               METH_NOARGS},
    {"test_long_long_and_overflow",test_long_long_and_overflow,  METH_NOARGS},
    {"test_L_code",             test_L_code,                     METH_NOARGS},
    {"getargs_f",               getargs_f,                       METH_VARARGS},
    {"getargs_d",               getargs_d,                       METH_VARARGS},
    {"getargs_D",               getargs_D,                       METH_VARARGS},
    {"getargs_S",               getargs_S,                       METH_VARARGS},
    {"getargs_Y",               getargs_Y,                       METH_VARARGS},
    {"getargs_U",               getargs_U,                       METH_VARARGS},
    {"getargs_c",               getargs_c,                       METH_VARARGS},
    {"getargs_C",               getargs_C,                       METH_VARARGS},
    {"getargs_s",               getargs_s,                       METH_VARARGS},
    {"getargs_s_star",          getargs_s_star,                  METH_VARARGS},
    {"getargs_s_hash",          getargs_s_hash,                  METH_VARARGS},
    {"getargs_s_hash_int",      (PyCFunction)(void(*)(void))getargs_s_hash_int,
      METH_VARARGS|METH_KEYWORDS},
    {"getargs_z",               getargs_z,                       METH_VARARGS},
    {"getargs_z_star",          getargs_z_star,                  METH_VARARGS},
    {"getargs_z_hash",          getargs_z_hash,                  METH_VARARGS},
    {"getargs_y",               getargs_y,                       METH_VARARGS},
    {"getargs_y_star",          getargs_y_star,                  METH_VARARGS},
    {"getargs_y_hash",          getargs_y_hash,                  METH_VARARGS},
    {"getargs_u",               getargs_u,                       METH_VARARGS},
    {"getargs_u_hash",          getargs_u_hash,                  METH_VARARGS},
    {"getargs_Z",               getargs_Z,                       METH_VARARGS},
    {"getargs_Z_hash",          getargs_Z_hash,                  METH_VARARGS},
    {"getargs_w_star",          getargs_w_star,                  METH_VARARGS},
    {"getargs_es",              getargs_es,                      METH_VARARGS},
    {"getargs_et",              getargs_et,                      METH_VARARGS},
    {"getargs_es_hash",         getargs_es_hash,                 METH_VARARGS},
    {"getargs_et_hash",         getargs_et_hash,                 METH_VARARGS},
    {"codec_incrementalencoder",
     (PyCFunction)codec_incrementalencoder,                      METH_VARARGS},
    {"codec_incrementaldecoder",
     (PyCFunction)codec_incrementaldecoder,                      METH_VARARGS},
    {"test_s_code",             test_s_code,                     METH_NOARGS},
#if USE_UNICODE_WCHAR_CACHE
    {"test_u_code",             test_u_code,                     METH_NOARGS},
    {"test_Z_code",             test_Z_code,                     METH_NOARGS},
#endif /* USE_UNICODE_WCHAR_CACHE */
    {"test_widechar",           test_widechar,                   METH_NOARGS},
    {"unicode_aswidechar",      unicode_aswidechar,              METH_VARARGS},
    {"unicode_aswidecharstring",unicode_aswidecharstring,        METH_VARARGS},
    {"unicode_asucs4",          unicode_asucs4,                  METH_VARARGS},
    {"unicode_asutf8",          unicode_asutf8,                  METH_VARARGS},
    {"unicode_asutf8andsize",   unicode_asutf8andsize,           METH_VARARGS},
    {"unicode_findchar",        unicode_findchar,                METH_VARARGS},
    {"unicode_copycharacters",  unicode_copycharacters,          METH_VARARGS},
#if USE_UNICODE_WCHAR_CACHE
    {"unicode_legacy_string",   unicode_legacy_string,           METH_VARARGS},
#endif /* USE_UNICODE_WCHAR_CACHE */
    {"_test_thread_state",      test_thread_state,               METH_VARARGS},
    {"_pending_threadfunc",     pending_threadfunc,              METH_VARARGS},
#ifdef HAVE_GETTIMEOFDAY
    {"profile_int",             profile_int,                     METH_NOARGS},
#endif
    {"traceback_print",         traceback_print,                 METH_VARARGS},
    {"exception_print",         exception_print,                 METH_VARARGS},
    {"set_exc_info",            test_set_exc_info,               METH_VARARGS},
    {"argparsing",              argparsing,                      METH_VARARGS},
    {"code_newempty",           code_newempty,                   METH_VARARGS},
    {"make_exception_with_doc", (PyCFunction)(void(*)(void))make_exception_with_doc,
     METH_VARARGS | METH_KEYWORDS},
    {"make_memoryview_from_NULL_pointer", make_memoryview_from_NULL_pointer,
     METH_NOARGS},
    {"crash_no_current_thread", crash_no_current_thread,         METH_NOARGS},
    {"run_in_subinterp",        run_in_subinterp,                METH_VARARGS},
    {"pytime_object_to_time_t", test_pytime_object_to_time_t,  METH_VARARGS},
    {"pytime_object_to_timeval", test_pytime_object_to_timeval,  METH_VARARGS},
    {"pytime_object_to_timespec", test_pytime_object_to_timespec,  METH_VARARGS},
    {"with_tp_del",             with_tp_del,                     METH_VARARGS},
    {"create_cfunction",        create_cfunction,                METH_NOARGS},
    {"test_pymem_alloc0",       test_pymem_alloc0,               METH_NOARGS},
    {"test_pymem_setrawallocators",test_pymem_setrawallocators,  METH_NOARGS},
    {"test_pymem_setallocators",test_pymem_setallocators,        METH_NOARGS},
    {"test_pyobject_setallocators",test_pyobject_setallocators,  METH_NOARGS},
    {"set_nomemory", (PyCFunction)set_nomemory, METH_VARARGS,
     PyDoc_STR("set_nomemory(start:int, stop:int = 0)")},
    {"remove_mem_hooks",        remove_mem_hooks,                METH_NOARGS,
     PyDoc_STR("Remove memory hooks.")},
    {"no_docstring",
        (PyCFunction)test_with_docstring, METH_NOARGS},
    {"docstring_empty",
        (PyCFunction)test_with_docstring, METH_NOARGS,
        docstring_empty},
    {"docstring_no_signature",
        (PyCFunction)test_with_docstring, METH_NOARGS,
        docstring_no_signature},
    {"docstring_with_invalid_signature",
        (PyCFunction)test_with_docstring, METH_NOARGS,
        docstring_with_invalid_signature},
    {"docstring_with_invalid_signature2",
        (PyCFunction)test_with_docstring, METH_NOARGS,
        docstring_with_invalid_signature2},
    {"docstring_with_signature",
        (PyCFunction)test_with_docstring, METH_NOARGS,
        docstring_with_signature},
    {"docstring_with_signature_but_no_doc",
        (PyCFunction)test_with_docstring, METH_NOARGS,
        docstring_with_signature_but_no_doc},
    {"docstring_with_signature_and_extra_newlines",
        (PyCFunction)test_with_docstring, METH_NOARGS,
        docstring_with_signature_and_extra_newlines},
    {"docstring_with_signature_with_defaults",
        (PyCFunction)test_with_docstring, METH_NOARGS,
        docstring_with_signature_with_defaults},
    {"call_in_temporary_c_thread", call_in_temporary_c_thread, METH_O,
     PyDoc_STR("set_error_class(error_class) -> None")},
    {"pymarshal_write_long_to_file",
        pymarshal_write_long_to_file, METH_VARARGS},
    {"pymarshal_write_object_to_file",
        pymarshal_write_object_to_file, METH_VARARGS},
    {"pymarshal_read_short_from_file",
        pymarshal_read_short_from_file, METH_VARARGS},
    {"pymarshal_read_long_from_file",
        pymarshal_read_long_from_file, METH_VARARGS},
    {"pymarshal_read_last_object_from_file",
        pymarshal_read_last_object_from_file, METH_VARARGS},
    {"pymarshal_read_object_from_file",
        pymarshal_read_object_from_file, METH_VARARGS},
    {"return_null_without_error", return_null_without_error, METH_NOARGS},
    {"return_result_with_error", return_result_with_error, METH_NOARGS},
    {"getitem_with_error", getitem_with_error, METH_VARARGS},
    {"Py_CompileString",     pycompilestring, METH_O},
    {"PyTime_FromSeconds", test_pytime_fromseconds,  METH_VARARGS},
    {"PyTime_FromSecondsObject", test_pytime_fromsecondsobject,  METH_VARARGS},
    {"PyTime_AsSecondsDouble", test_pytime_assecondsdouble, METH_VARARGS},
    {"PyTime_AsTimeval", test_PyTime_AsTimeval, METH_VARARGS},
    {"PyTime_AsTimeval_clamp", test_PyTime_AsTimeval_clamp, METH_VARARGS},
#ifdef HAVE_CLOCK_GETTIME
    {"PyTime_AsTimespec", test_PyTime_AsTimespec, METH_VARARGS},
    {"PyTime_AsTimespec_clamp", test_PyTime_AsTimespec_clamp, METH_VARARGS},
#endif
    {"PyTime_AsMilliseconds", test_PyTime_AsMilliseconds, METH_VARARGS},
    {"PyTime_AsMicroseconds", test_PyTime_AsMicroseconds, METH_VARARGS},
    {"pymem_buffer_overflow", pymem_buffer_overflow, METH_NOARGS},
    {"pymem_api_misuse", pymem_api_misuse, METH_NOARGS},
    {"pymem_malloc_without_gil", pymem_malloc_without_gil, METH_NOARGS},
    {"pymem_getallocatorsname", test_pymem_getallocatorsname, METH_NOARGS},
    {"check_pyobject_null_is_freed", check_pyobject_null_is_freed, METH_NOARGS},
    {"check_pyobject_uninitialized_is_freed", check_pyobject_uninitialized_is_freed, METH_NOARGS},
    {"check_pyobject_forbidden_bytes_is_freed", check_pyobject_forbidden_bytes_is_freed, METH_NOARGS},
    {"check_pyobject_freed_is_freed", check_pyobject_freed_is_freed, METH_NOARGS},
    {"pyobject_malloc_without_gil", pyobject_malloc_without_gil, METH_NOARGS},
    {"tracemalloc_track", tracemalloc_track, METH_VARARGS},
    {"tracemalloc_untrack", tracemalloc_untrack, METH_VARARGS},
    {"tracemalloc_get_traceback", tracemalloc_get_traceback, METH_VARARGS},
    {"dict_get_version", dict_get_version, METH_VARARGS},
    {"raise_SIGINT_then_send_None", raise_SIGINT_then_send_None, METH_VARARGS},
    {"pyobject_fastcall", test_pyobject_fastcall, METH_VARARGS},
    {"pyobject_fastcalldict", test_pyobject_fastcalldict, METH_VARARGS},
    {"pyobject_vectorcall", test_pyobject_vectorcall, METH_VARARGS},
    {"pyvectorcall_call", test_pyvectorcall_call, METH_VARARGS},
    {"stack_pointer", stack_pointer, METH_NOARGS},
#ifdef W_STOPCODE
    {"W_STOPCODE", py_w_stopcode, METH_VARARGS},
#endif
    {"get_mapping_keys", get_mapping_keys, METH_O},
    {"get_mapping_values", get_mapping_values, METH_O},
    {"get_mapping_items", get_mapping_items, METH_O},
    {"test_pythread_tss_key_state", test_pythread_tss_key_state, METH_VARARGS},
    {"hamt", new_hamt, METH_NOARGS},
    {"bad_get", (PyCFunction)(void(*)(void))bad_get, METH_FASTCALL},
#ifdef Py_REF_DEBUG
    {"negative_refcount", negative_refcount, METH_NOARGS},
#endif
    {"write_unraisable_exc", test_write_unraisable_exc, METH_VARARGS},
    {"sequence_getitem", sequence_getitem, METH_VARARGS},
    {"meth_varargs", meth_varargs, METH_VARARGS},
    {"meth_varargs_keywords", (PyCFunction)(void(*)(void))meth_varargs_keywords, METH_VARARGS|METH_KEYWORDS},
    {"meth_o", meth_o, METH_O},
    {"meth_noargs", meth_noargs, METH_NOARGS},
    {"meth_fastcall", (PyCFunction)(void(*)(void))meth_fastcall, METH_FASTCALL},
    {"meth_fastcall_keywords", (PyCFunction)(void(*)(void))meth_fastcall_keywords, METH_FASTCALL|METH_KEYWORDS},
    {"pynumber_tobase", pynumber_tobase, METH_VARARGS},
    {"without_gc", without_gc, METH_O},
    {"test_set_type_size", test_set_type_size, METH_NOARGS},
    {"test_refcount_macros", test_refcount_macros, METH_NOARGS},
    {"test_refcount_funcs", test_refcount_funcs, METH_NOARGS},
    {"test_py_is_macros", test_py_is_macros, METH_NOARGS},
    {"test_py_is_funcs", test_py_is_funcs, METH_NOARGS},
    {"fatal_error", test_fatal_error, METH_VARARGS,
     PyDoc_STR("fatal_error(message, release_gil=False): call Py_FatalError(message)")},
    {"type_get_version", type_get_version, METH_O, PyDoc_STR("type->tp_version_tag")},
    {"test_tstate_capi", test_tstate_capi, METH_NOARGS, NULL},
    {NULL, NULL} /* sentinel */
};

#define AddSym(d, n, f, v) {PyObject *o = f(v); PyDict_SetItemString(d, n, o); Py_DECREF(o);}

typedef struct {
    char bool_member;
    char byte_member;
    unsigned char ubyte_member;
    short short_member;
    unsigned short ushort_member;
    int int_member;
    unsigned int uint_member;
    long long_member;
    unsigned long ulong_member;
    Py_ssize_t pyssizet_member;
    float float_member;
    double double_member;
    char inplace_member[6];
    long long longlong_member;
    unsigned long long ulonglong_member;
} all_structmembers;

typedef struct {
    PyObject_HEAD
    all_structmembers structmembers;
} test_structmembers;

static struct PyMemberDef test_members[] = {
    {"T_BOOL", T_BOOL, offsetof(test_structmembers, structmembers.bool_member), 0, NULL},
    {"T_BYTE", T_BYTE, offsetof(test_structmembers, structmembers.byte_member), 0, NULL},
    {"T_UBYTE", T_UBYTE, offsetof(test_structmembers, structmembers.ubyte_member), 0, NULL},
    {"T_SHORT", T_SHORT, offsetof(test_structmembers, structmembers.short_member), 0, NULL},
    {"T_USHORT", T_USHORT, offsetof(test_structmembers, structmembers.ushort_member), 0, NULL},
    {"T_INT", T_INT, offsetof(test_structmembers, structmembers.int_member), 0, NULL},
    {"T_UINT", T_UINT, offsetof(test_structmembers, structmembers.uint_member), 0, NULL},
    {"T_LONG", T_LONG, offsetof(test_structmembers, structmembers.long_member), 0, NULL},
    {"T_ULONG", T_ULONG, offsetof(test_structmembers, structmembers.ulong_member), 0, NULL},
    {"T_PYSSIZET", T_PYSSIZET, offsetof(test_structmembers, structmembers.pyssizet_member), 0, NULL},
    {"T_FLOAT", T_FLOAT, offsetof(test_structmembers, structmembers.float_member), 0, NULL},
    {"T_DOUBLE", T_DOUBLE, offsetof(test_structmembers, structmembers.double_member), 0, NULL},
    {"T_STRING_INPLACE", T_STRING_INPLACE, offsetof(test_structmembers, structmembers.inplace_member), 0, NULL},
    {"T_LONGLONG", T_LONGLONG, offsetof(test_structmembers, structmembers.longlong_member), 0, NULL},
    {"T_ULONGLONG", T_ULONGLONG, offsetof(test_structmembers, structmembers.ulonglong_member), 0, NULL},
    {NULL}
};


static PyObject *
test_structmembers_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
{
    static char *keywords[] = {
        "T_BOOL", "T_BYTE", "T_UBYTE", "T_SHORT", "T_USHORT",
        "T_INT", "T_UINT", "T_LONG", "T_ULONG", "T_PYSSIZET",
        "T_FLOAT", "T_DOUBLE", "T_STRING_INPLACE",
        "T_LONGLONG", "T_ULONGLONG",
        NULL};
    static const char fmt[] = "|bbBhHiIlknfds#LK";
    test_structmembers *ob;
    const char *s = NULL;
    Py_ssize_t string_len = 0;
    ob = PyObject_New(test_structmembers, type);
    if (ob == NULL)
        return NULL;
    memset(&ob->structmembers, 0, sizeof(all_structmembers));
    if (!PyArg_ParseTupleAndKeywords(args, kwargs, fmt, keywords,
                                     &ob->structmembers.bool_member,
                                     &ob->structmembers.byte_member,
                                     &ob->structmembers.ubyte_member,
                                     &ob->structmembers.short_member,
                                     &ob->structmembers.ushort_member,
                                     &ob->structmembers.int_member,
                                     &ob->structmembers.uint_member,
                                     &ob->structmembers.long_member,
                                     &ob->structmembers.ulong_member,
                                     &ob->structmembers.pyssizet_member,
                                     &ob->structmembers.float_member,
                                     &ob->structmembers.double_member,
                                     &s, &string_len
                                     , &ob->structmembers.longlong_member,
                                     &ob->structmembers.ulonglong_member
        )) {
        Py_DECREF(ob);
        return NULL;
    }
    if (s != NULL) {
        if (string_len > 5) {
            Py_DECREF(ob);
            PyErr_SetString(PyExc_ValueError, "string too long");
            return NULL;
        }
        strcpy(ob->structmembers.inplace_member, s);
    }
    else {
        strcpy(ob->structmembers.inplace_member, "");
    }
    return (PyObject *)ob;
}

static void
test_structmembers_free(PyObject *ob)
{
    PyObject_Free(ob);
}

static PyTypeObject test_structmembersType = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "test_structmembersType",
    sizeof(test_structmembers),         /* tp_basicsize */
    0,                                  /* tp_itemsize */
    test_structmembers_free,            /* destructor tp_dealloc */
    0,                                  /* tp_vectorcall_offset */
    0,                                  /* tp_getattr */
    0,                                  /* tp_setattr */
    0,                                  /* tp_as_async */
    0,                                  /* tp_repr */
    0,                                  /* tp_as_number */
    0,                                  /* tp_as_sequence */
    0,                                  /* tp_as_mapping */
    0,                                  /* tp_hash */
    0,                                  /* tp_call */
    0,                                  /* tp_str */
    PyObject_GenericGetAttr,            /* tp_getattro */
    PyObject_GenericSetAttr,            /* tp_setattro */
    0,                                  /* tp_as_buffer */
    0,                                  /* tp_flags */
    "Type containing all structmember types",
    0,                                  /* traverseproc tp_traverse */
    0,                                  /* tp_clear */
    0,                                  /* tp_richcompare */
    0,                                  /* tp_weaklistoffset */
    0,                                  /* tp_iter */
    0,                                  /* tp_iternext */
    0,                                  /* tp_methods */
    test_members,                       /* tp_members */
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    test_structmembers_new,             /* tp_new */
};


typedef struct {
    PyObject_HEAD
} matmulObject;

static PyObject *
matmulType_matmul(PyObject *self, PyObject *other)
{
    return Py_BuildValue("(sOO)", "matmul", self, other);
}

static PyObject *
matmulType_imatmul(PyObject *self, PyObject *other)
{
    return Py_BuildValue("(sOO)", "imatmul", self, other);
}

static void
matmulType_dealloc(PyObject *self)
{
    Py_TYPE(self)->tp_free(self);
}

static PyNumberMethods matmulType_as_number = {
    0,                          /* nb_add */
    0,                          /* nb_subtract */
    0,                          /* nb_multiply */
    0,                          /* nb_remainde r*/
    0,                          /* nb_divmod */
    0,                          /* nb_power */
    0,                          /* nb_negative */
    0,                          /* tp_positive */
    0,                          /* tp_absolute */
    0,                          /* tp_bool */
    0,                          /* nb_invert */
    0,                          /* nb_lshift */
    0,                          /* nb_rshift */
    0,                          /* nb_and */
    0,                          /* nb_xor */
    0,                          /* nb_or */
    0,                          /* nb_int */
    0,                          /* nb_reserved */
    0,                          /* nb_float */
    0,                          /* nb_inplace_add */
    0,                          /* nb_inplace_subtract */
    0,                          /* nb_inplace_multiply */
    0,                          /* nb_inplace_remainder */
    0,                          /* nb_inplace_power */
    0,                          /* nb_inplace_lshift */
    0,                          /* nb_inplace_rshift */
    0,                          /* nb_inplace_and */
    0,                          /* nb_inplace_xor */
    0,                          /* nb_inplace_or */
    0,                          /* nb_floor_divide */
    0,                          /* nb_true_divide */
    0,                          /* nb_inplace_floor_divide */
    0,                          /* nb_inplace_true_divide */
    0,                          /* nb_index */
    matmulType_matmul,        /* nb_matrix_multiply */
    matmulType_imatmul        /* nb_matrix_inplace_multiply */
};

static PyTypeObject matmulType = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "matmulType",
    sizeof(matmulObject),               /* tp_basicsize */
    0,                                  /* tp_itemsize */
    matmulType_dealloc,                 /* destructor tp_dealloc */
    0,                                  /* tp_vectorcall_offset */
    0,                                  /* tp_getattr */
    0,                                  /* tp_setattr */
    0,                                  /* tp_as_async */
    0,                                  /* tp_repr */
    &matmulType_as_number,              /* tp_as_number */
    0,                                  /* tp_as_sequence */
    0,                                  /* tp_as_mapping */
    0,                                  /* tp_hash */
    0,                                  /* tp_call */
    0,                                  /* tp_str */
    PyObject_GenericGetAttr,            /* tp_getattro */
    PyObject_GenericSetAttr,            /* tp_setattro */
    0,                                  /* tp_as_buffer */
    0,                                  /* tp_flags */
    "C level type with matrix operations defined",
    0,                                  /* traverseproc tp_traverse */
    0,                                  /* tp_clear */
    0,                                  /* tp_richcompare */
    0,                                  /* tp_weaklistoffset */
    0,                                  /* tp_iter */
    0,                                  /* tp_iternext */
    0,                                  /* tp_methods */
    0,                                  /* tp_members */
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    PyType_GenericNew,                  /* tp_new */
    PyObject_Del,                       /* tp_free */
};

typedef struct {
    PyObject_HEAD
} ipowObject;

static PyObject *
ipowType_ipow(PyObject *self, PyObject *other, PyObject *mod)
{
    return Py_BuildValue("OO", other, mod);
}

static PyNumberMethods ipowType_as_number = {
    .nb_inplace_power = ipowType_ipow
};

static PyTypeObject ipowType = {
    PyVarObject_HEAD_INIT(NULL, 0)
    .tp_name = "ipowType",
    .tp_basicsize = sizeof(ipowObject),
    .tp_as_number = &ipowType_as_number,
    .tp_new = PyType_GenericNew
};

typedef struct {
    PyObject_HEAD
    PyObject *ao_iterator;
} awaitObject;


static PyObject *
awaitObject_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
    PyObject *v;
    awaitObject *ao;

    if (!PyArg_UnpackTuple(args, "awaitObject", 1, 1, &v))
        return NULL;

    ao = (awaitObject *)type->tp_alloc(type, 0);
    if (ao == NULL) {
        return NULL;
    }

    Py_INCREF(v);
    ao->ao_iterator = v;

    return (PyObject *)ao;
}


static void
awaitObject_dealloc(awaitObject *ao)
{
    Py_CLEAR(ao->ao_iterator);
    Py_TYPE(ao)->tp_free(ao);
}


static PyObject *
awaitObject_await(awaitObject *ao)
{
    Py_INCREF(ao->ao_iterator);
    return ao->ao_iterator;
}

static PyAsyncMethods awaitType_as_async = {
    (unaryfunc)awaitObject_await,           /* am_await */
    0,                                      /* am_aiter */
    0,                                      /* am_anext */
    0,                                      /* am_send  */
};


static PyTypeObject awaitType = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "awaitType",
    sizeof(awaitObject),                /* tp_basicsize */
    0,                                  /* tp_itemsize */
    (destructor)awaitObject_dealloc,    /* destructor tp_dealloc */
    0,                                  /* tp_vectorcall_offset */
    0,                                  /* tp_getattr */
    0,                                  /* tp_setattr */
    &awaitType_as_async,                /* tp_as_async */
    0,                                  /* tp_repr */
    0,                                  /* tp_as_number */
    0,                                  /* tp_as_sequence */
    0,                                  /* tp_as_mapping */
    0,                                  /* tp_hash */
    0,                                  /* tp_call */
    0,                                  /* tp_str */
    PyObject_GenericGetAttr,            /* tp_getattro */
    PyObject_GenericSetAttr,            /* tp_setattro */
    0,                                  /* tp_as_buffer */
    0,                                  /* tp_flags */
    "C level type with tp_as_async",
    0,                                  /* traverseproc tp_traverse */
    0,                                  /* tp_clear */
    0,                                  /* tp_richcompare */
    0,                                  /* tp_weaklistoffset */
    0,                                  /* tp_iter */
    0,                                  /* tp_iternext */
    0,                                  /* tp_methods */
    0,                                  /* tp_members */
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    awaitObject_new,                    /* tp_new */
    PyObject_Del,                       /* tp_free */
};


static int recurse_infinitely_error_init(PyObject *, PyObject *, PyObject *);

static PyTypeObject PyRecursingInfinitelyError_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "RecursingInfinitelyError",   /* tp_name */
    sizeof(PyBaseExceptionObject), /* tp_basicsize */
    0,                          /* tp_itemsize */
    0,                          /* tp_dealloc */
    0,                          /* tp_vectorcall_offset */
    0,                          /* tp_getattr */
    0,                          /* tp_setattr */
    0,                          /* tp_as_async */
    0,                          /* tp_repr */
    0,                          /* tp_as_number */
    0,                          /* tp_as_sequence */
    0,                          /* tp_as_mapping */
    0,                          /* tp_hash */
    0,                          /* tp_call */
    0,                          /* tp_str */
    0,                          /* tp_getattro */
    0,                          /* tp_setattro */
    0,                          /* tp_as_buffer */
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
    "Instantiating this exception starts infinite recursion.", /* tp_doc */
    0,                          /* tp_traverse */
    0,                          /* tp_clear */
    0,                          /* tp_richcompare */
    0,                          /* tp_weaklistoffset */
    0,                          /* tp_iter */
    0,                          /* tp_iternext */
    0,                          /* tp_methods */
    0,                          /* tp_members */
    0,                          /* tp_getset */
    0,                          /* tp_base */
    0,                          /* tp_dict */
    0,                          /* tp_descr_get */
    0,                          /* tp_descr_set */
    0,                          /* tp_dictoffset */
    (initproc)recurse_infinitely_error_init, /* tp_init */
    0,                          /* tp_alloc */
    0,                          /* tp_new */
};

static int
recurse_infinitely_error_init(PyObject *self, PyObject *args, PyObject *kwds)
{
    PyObject *type = (PyObject *)&PyRecursingInfinitelyError_Type;

    /* Instantiating this exception starts infinite recursion. */
    Py_INCREF(type);
    PyErr_SetObject(type, NULL);
    return -1;
}


/* Test bpo-35983: create a subclass of "list" which checks that instances
 * are not deallocated twice */

typedef struct {
    PyListObject list;
    int deallocated;
} MyListObject;

static PyObject *
MyList_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
    PyObject* op = PyList_Type.tp_new(type, args, kwds);
    ((MyListObject*)op)->deallocated = 0;
    return op;
}

void
MyList_dealloc(MyListObject* op)
{
    if (op->deallocated) {
        /* We cannot raise exceptions here but we still want the testsuite
         * to fail when we hit this */
        Py_FatalError("MyList instance deallocated twice");
    }
    op->deallocated = 1;
    PyList_Type.tp_dealloc((PyObject *)op);
}

static PyTypeObject MyList_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "MyList",
    sizeof(MyListObject),
    0,
    (destructor)MyList_dealloc,                 /* tp_dealloc */
    0,                                          /* tp_vectorcall_offset */
    0,                                          /* tp_getattr */
    0,                                          /* tp_setattr */
    0,                                          /* tp_as_async */
    0,                                          /* tp_repr */
    0,                                          /* tp_as_number */
    0,                                          /* tp_as_sequence */
    0,                                          /* tp_as_mapping */
    0,                                          /* tp_hash */
    0,                                          /* tp_call */
    0,                                          /* tp_str */
    0,                                          /* tp_getattro */
    0,                                          /* tp_setattro */
    0,                                          /* tp_as_buffer */
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,   /* tp_flags */
    0,                                          /* tp_doc */
    0,                                          /* tp_traverse */
    0,                                          /* tp_clear */
    0,                                          /* tp_richcompare */
    0,                                          /* tp_weaklistoffset */
    0,                                          /* tp_iter */
    0,                                          /* tp_iternext */
    0,                                          /* tp_methods */
    0,                                          /* tp_members */
    0,                                          /* tp_getset */
    0,  /* &PyList_Type */                      /* tp_base */
    0,                                          /* tp_dict */
    0,                                          /* tp_descr_get */
    0,                                          /* tp_descr_set */
    0,                                          /* tp_dictoffset */
    0,                                          /* tp_init */
    0,                                          /* tp_alloc */
    MyList_new,                                 /* tp_new */
};


/* Test PEP 560 */

typedef struct {
    PyObject_HEAD
    PyObject *item;
} PyGenericAliasObject;

static void
generic_alias_dealloc(PyGenericAliasObject *self)
{
    Py_CLEAR(self->item);
    Py_TYPE(self)->tp_free((PyObject *)self);
}

static PyObject *
generic_alias_mro_entries(PyGenericAliasObject *self, PyObject *bases)
{
    return PyTuple_Pack(1, self->item);
}

static PyMethodDef generic_alias_methods[] = {
    {"__mro_entries__", (PyCFunction)(void(*)(void))generic_alias_mro_entries, METH_O, NULL},
    {NULL}  /* sentinel */
};

static PyTypeObject GenericAlias_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "GenericAlias",
    sizeof(PyGenericAliasObject),
    0,
    .tp_dealloc = (destructor)generic_alias_dealloc,
    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    .tp_methods = generic_alias_methods,
};

static PyObject *
generic_alias_new(PyObject *item)
{
    PyGenericAliasObject *o = PyObject_New(PyGenericAliasObject, &GenericAlias_Type);
    if (o == NULL) {
        return NULL;
    }
    Py_INCREF(item);
    o->item = item;
    return (PyObject*) o;
}

typedef struct {
    PyObject_HEAD
} PyGenericObject;

static PyObject *
generic_class_getitem(PyObject *type, PyObject *item)
{
    return generic_alias_new(item);
}

static PyMethodDef generic_methods[] = {
    {"__class_getitem__", generic_class_getitem, METH_O|METH_CLASS, NULL},
    {NULL}  /* sentinel */
};

static PyTypeObject Generic_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "Generic",
    sizeof(PyGenericObject),
    0,
    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    .tp_methods = generic_methods,
};


/* Test PEP 590 */

typedef struct {
    PyObject_HEAD
    vectorcallfunc vectorcall;
} MethodDescriptorObject;

static PyObject *
MethodDescriptor_vectorcall(PyObject *callable, PyObject *const *args,
                            size_t nargsf, PyObject *kwnames)
{
    /* True if using the vectorcall function in MethodDescriptorObject
     * but False for MethodDescriptor2Object */
    MethodDescriptorObject *md = (MethodDescriptorObject *)callable;
    return PyBool_FromLong(md->vectorcall != NULL);
}

static PyObject *
MethodDescriptor_new(PyTypeObject* type, PyObject* args, PyObject *kw)
{
    MethodDescriptorObject *op = (MethodDescriptorObject *)type->tp_alloc(type, 0);
    op->vectorcall = MethodDescriptor_vectorcall;
    return (PyObject *)op;
}

static PyObject *
func_descr_get(PyObject *func, PyObject *obj, PyObject *type)
{
    if (obj == Py_None || obj == NULL) {
        Py_INCREF(func);
        return func;
    }
    return PyMethod_New(func, obj);
}

static PyObject *
nop_descr_get(PyObject *func, PyObject *obj, PyObject *type)
{
    Py_INCREF(func);
    return func;
}

static PyObject *
call_return_args(PyObject *self, PyObject *args, PyObject *kwargs)
{
    Py_INCREF(args);
    return args;
}

static PyTypeObject MethodDescriptorBase_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "MethodDescriptorBase",
    sizeof(MethodDescriptorObject),
    .tp_new = MethodDescriptor_new,
    .tp_call = PyVectorcall_Call,
    .tp_vectorcall_offset = offsetof(MethodDescriptorObject, vectorcall),
    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
                Py_TPFLAGS_METHOD_DESCRIPTOR | Py_TPFLAGS_HAVE_VECTORCALL,
    .tp_descr_get = func_descr_get,
};

static PyTypeObject MethodDescriptorDerived_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "MethodDescriptorDerived",
    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
};

static PyTypeObject MethodDescriptorNopGet_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "MethodDescriptorNopGet",
    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    .tp_call = call_return_args,
    .tp_descr_get = nop_descr_get,
};

typedef struct {
    MethodDescriptorObject base;
    vectorcallfunc vectorcall;
} MethodDescriptor2Object;

static PyObject *
MethodDescriptor2_new(PyTypeObject* type, PyObject* args, PyObject *kw)
{
    MethodDescriptor2Object *op = PyObject_New(MethodDescriptor2Object, type);
    op->base.vectorcall = NULL;
    op->vectorcall = MethodDescriptor_vectorcall;
    return (PyObject *)op;
}

static PyTypeObject MethodDescriptor2_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "MethodDescriptor2",
    sizeof(MethodDescriptor2Object),
    .tp_new = MethodDescriptor2_new,
    .tp_call = PyVectorcall_Call,
    .tp_vectorcall_offset = offsetof(MethodDescriptor2Object, vectorcall),
    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_VECTORCALL,
};

PyDoc_STRVAR(heapdocctype__doc__,
"HeapDocCType(arg1, arg2)\n"
"--\n"
"\n"
"somedoc");

typedef struct {
    PyObject_HEAD
} HeapDocCTypeObject;

static PyType_Slot HeapDocCType_slots[] = {
    {Py_tp_doc, (char*)heapdocctype__doc__},
    {0},
};

static PyType_Spec HeapDocCType_spec = {
    "_testcapi.HeapDocCType",
    sizeof(HeapDocCTypeObject),
    0,
    Py_TPFLAGS_DEFAULT,
    HeapDocCType_slots
};

typedef struct {
    PyObject_HEAD
} HeapTypeNameObject;

static PyType_Slot HeapTypeNameType_slots[] = {
    {0},
};

static PyType_Spec HeapTypeNameType_Spec = {
    .name = "_testcapi.HeapTypeNameType",
    .basicsize = sizeof(HeapTypeNameObject),
    .flags = Py_TPFLAGS_DEFAULT,
    .slots = HeapTypeNameType_slots,
};

typedef struct {
    PyObject_HEAD
} NullTpDocTypeObject;

static PyType_Slot NullTpDocType_slots[] = {
    {Py_tp_doc, NULL},
    {0, 0},
};

static PyType_Spec NullTpDocType_spec = {
    "_testcapi.NullTpDocType",
    sizeof(NullTpDocTypeObject),
    0,
    Py_TPFLAGS_DEFAULT,
    NullTpDocType_slots
};


PyDoc_STRVAR(heapgctype__doc__,
"A heap type with GC, and with overridden dealloc.\n\n"
"The 'value' attribute is set to 10 in __init__.");

typedef struct {
    PyObject_HEAD
    int value;
} HeapCTypeObject;

static struct PyMemberDef heapctype_members[] = {
    {"value", T_INT, offsetof(HeapCTypeObject, value)},
    {NULL} /* Sentinel */
};

static int
heapctype_init(PyObject *self, PyObject *args, PyObject *kwargs)
{
    ((HeapCTypeObject *)self)->value = 10;
    return 0;
}

static int
heapgcctype_traverse(HeapCTypeObject *self, visitproc visit, void *arg)
{
    Py_VISIT(Py_TYPE(self));
    return 0;
}

static void
heapgcctype_dealloc(HeapCTypeObject *self)
{
    PyTypeObject *tp = Py_TYPE(self);
    PyObject_GC_UnTrack(self);
    PyObject_GC_Del(self);
    Py_DECREF(tp);
}

static PyType_Slot HeapGcCType_slots[] = {
    {Py_tp_init, heapctype_init},
    {Py_tp_members, heapctype_members},
    {Py_tp_dealloc, heapgcctype_dealloc},
    {Py_tp_traverse, heapgcctype_traverse},
    {Py_tp_doc, (char*)heapgctype__doc__},
    {0, 0},
};

static PyType_Spec HeapGcCType_spec = {
    "_testcapi.HeapGcCType",
    sizeof(HeapCTypeObject),
    0,
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
    HeapGcCType_slots
};

PyDoc_STRVAR(heapctype__doc__,
"A heap type without GC, but with overridden dealloc.\n\n"
"The 'value' attribute is set to 10 in __init__.");

static void
heapctype_dealloc(HeapCTypeObject *self)
{
    PyTypeObject *tp = Py_TYPE(self);
    PyObject_Free(self);
    Py_DECREF(tp);
}

static PyType_Slot HeapCType_slots[] = {
    {Py_tp_init, heapctype_init},
    {Py_tp_members, heapctype_members},
    {Py_tp_dealloc, heapctype_dealloc},
    {Py_tp_doc, (char*)heapctype__doc__},
    {0, 0},
};

static PyType_Spec HeapCType_spec = {
    "_testcapi.HeapCType",
    sizeof(HeapCTypeObject),
    0,
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    HeapCType_slots
};

PyDoc_STRVAR(heapctypesubclass__doc__,
"Subclass of HeapCType, without GC.\n\n"
"__init__ sets the 'value' attribute to 10 and 'value2' to 20.");

typedef struct {
    HeapCTypeObject base;
    int value2;
} HeapCTypeSubclassObject;

static int
heapctypesubclass_init(PyObject *self, PyObject *args, PyObject *kwargs)
{
    /* Call __init__ of the superclass */
    if (heapctype_init(self, args, kwargs) < 0) {
        return -1;
    }
    /* Initialize additional element */
    ((HeapCTypeSubclassObject *)self)->value2 = 20;
    return 0;
}

static struct PyMemberDef heapctypesubclass_members[] = {
    {"value2", T_INT, offsetof(HeapCTypeSubclassObject, value2)},
    {NULL} /* Sentinel */
};

static PyType_Slot HeapCTypeSubclass_slots[] = {
    {Py_tp_init, heapctypesubclass_init},
    {Py_tp_members, heapctypesubclass_members},
    {Py_tp_doc, (char*)heapctypesubclass__doc__},
    {0, 0},
};

static PyType_Spec HeapCTypeSubclass_spec = {
    "_testcapi.HeapCTypeSubclass",
    sizeof(HeapCTypeSubclassObject),
    0,
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    HeapCTypeSubclass_slots
};

PyDoc_STRVAR(heapctypewithbuffer__doc__,
"Heap type with buffer support.\n\n"
"The buffer is set to [b'1', b'2', b'3', b'4']");

typedef struct {
    HeapCTypeObject base;
    char buffer[4];
} HeapCTypeWithBufferObject;

static int
heapctypewithbuffer_getbuffer(HeapCTypeWithBufferObject *self, Py_buffer *view, int flags)
{
    self->buffer[0] = '1';
    self->buffer[1] = '2';
    self->buffer[2] = '3';
    self->buffer[3] = '4';
    return PyBuffer_FillInfo(
        view, (PyObject*)self, (void *)self->buffer, 4, 1, flags);
}

static void
heapctypewithbuffer_releasebuffer(HeapCTypeWithBufferObject *self, Py_buffer *view)
{
    assert(view->obj == (void*) self);
}

static PyType_Slot HeapCTypeWithBuffer_slots[] = {
    {Py_bf_getbuffer, heapctypewithbuffer_getbuffer},
    {Py_bf_releasebuffer, heapctypewithbuffer_releasebuffer},
    {Py_tp_doc, (char*)heapctypewithbuffer__doc__},
    {0, 0},
};

static PyType_Spec HeapCTypeWithBuffer_spec = {
    "_testcapi.HeapCTypeWithBuffer",
    sizeof(HeapCTypeWithBufferObject),
    0,
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    HeapCTypeWithBuffer_slots
};

PyDoc_STRVAR(heapctypesubclasswithfinalizer__doc__,
"Subclass of HeapCType with a finalizer that reassigns __class__.\n\n"
"__class__ is set to plain HeapCTypeSubclass during finalization.\n"
"__init__ sets the 'value' attribute to 10 and 'value2' to 20.");

static int
heapctypesubclasswithfinalizer_init(PyObject *self, PyObject *args, PyObject *kwargs)
{
    PyTypeObject *base = (PyTypeObject *)PyType_GetSlot(Py_TYPE(self), Py_tp_base);
    initproc base_init = PyType_GetSlot(base, Py_tp_init);
    base_init(self, args, kwargs);
    return 0;
}

static void
heapctypesubclasswithfinalizer_finalize(PyObject *self)
{
    PyObject *error_type, *error_value, *error_traceback, *m;
    PyObject *oldtype = NULL, *newtype = NULL, *refcnt = NULL;

    /* Save the current exception, if any. */
    PyErr_Fetch(&error_type, &error_value, &error_traceback);

    m = PyState_FindModule(&_testcapimodule);
    if (m == NULL) {
        goto cleanup_finalize;
    }
    oldtype = PyObject_GetAttrString(m, "HeapCTypeSubclassWithFinalizer");
    newtype = PyObject_GetAttrString(m, "HeapCTypeSubclass");
    if (oldtype == NULL || newtype == NULL) {
        goto cleanup_finalize;
    }

    if (PyObject_SetAttrString(self, "__class__", newtype) < 0) {
        goto cleanup_finalize;
    }
    refcnt = PyLong_FromSsize_t(Py_REFCNT(oldtype));
    if (refcnt == NULL) {
        goto cleanup_finalize;
    }
    if (PyObject_SetAttrString(oldtype, "refcnt_in_del", refcnt) < 0) {
        goto cleanup_finalize;
    }
    Py_DECREF(refcnt);
    refcnt = PyLong_FromSsize_t(Py_REFCNT(newtype));
    if (refcnt == NULL) {
        goto cleanup_finalize;
    }
    if (PyObject_SetAttrString(newtype, "refcnt_in_del", refcnt) < 0) {
        goto cleanup_finalize;
    }

cleanup_finalize:
    Py_XDECREF(oldtype);
    Py_XDECREF(newtype);
    Py_XDECREF(refcnt);

    /* Restore the saved exception. */
    PyErr_Restore(error_type, error_value, error_traceback);
}

static PyType_Slot HeapCTypeSubclassWithFinalizer_slots[] = {
    {Py_tp_init, heapctypesubclasswithfinalizer_init},
    {Py_tp_members, heapctypesubclass_members},
    {Py_tp_finalize, heapctypesubclasswithfinalizer_finalize},
    {Py_tp_doc, (char*)heapctypesubclasswithfinalizer__doc__},
    {0, 0},
};

static PyType_Spec HeapCTypeSubclassWithFinalizer_spec = {
    "_testcapi.HeapCTypeSubclassWithFinalizer",
    sizeof(HeapCTypeSubclassObject),
    0,
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_FINALIZE,
    HeapCTypeSubclassWithFinalizer_slots
};

typedef struct {
    PyObject_HEAD
    PyObject *dict;
} HeapCTypeWithDictObject;

static void
heapctypewithdict_dealloc(HeapCTypeWithDictObject* self)
{

    PyTypeObject *tp = Py_TYPE(self);
    Py_XDECREF(self->dict);
    PyObject_Free(self);
    Py_DECREF(tp);
}

static PyGetSetDef heapctypewithdict_getsetlist[] = {
    {"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict},
    {NULL} /* Sentinel */
};

static struct PyMemberDef heapctypewithdict_members[] = {
    {"dictobj", T_OBJECT, offsetof(HeapCTypeWithDictObject, dict)},
    {"__dictoffset__", T_PYSSIZET, offsetof(HeapCTypeWithDictObject, dict), READONLY},
    {NULL} /* Sentinel */
};

static PyType_Slot HeapCTypeWithDict_slots[] = {
    {Py_tp_members, heapctypewithdict_members},
    {Py_tp_getset, heapctypewithdict_getsetlist},
    {Py_tp_dealloc, heapctypewithdict_dealloc},
    {0, 0},
};

static PyType_Spec HeapCTypeWithDict_spec = {
    "_testcapi.HeapCTypeWithDict",
    sizeof(HeapCTypeWithDictObject),
    0,
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    HeapCTypeWithDict_slots
};

static struct PyMemberDef heapctypewithnegativedict_members[] = {
    {"dictobj", T_OBJECT, offsetof(HeapCTypeWithDictObject, dict)},
    {"__dictoffset__", T_PYSSIZET, -(Py_ssize_t)sizeof(void*), READONLY},
    {NULL} /* Sentinel */
};

static PyType_Slot HeapCTypeWithNegativeDict_slots[] = {
    {Py_tp_members, heapctypewithnegativedict_members},
    {Py_tp_getset, heapctypewithdict_getsetlist},
    {Py_tp_dealloc, heapctypewithdict_dealloc},
    {0, 0},
};

static PyType_Spec HeapCTypeWithNegativeDict_spec = {
    "_testcapi.HeapCTypeWithNegativeDict",
    sizeof(HeapCTypeWithDictObject),
    0,
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    HeapCTypeWithNegativeDict_slots
};

typedef struct {
    PyObject_HEAD
    PyObject *weakreflist;
} HeapCTypeWithWeakrefObject;

static struct PyMemberDef heapctypewithweakref_members[] = {
    {"weakreflist", T_OBJECT, offsetof(HeapCTypeWithWeakrefObject, weakreflist)},
    {"__weaklistoffset__", T_PYSSIZET,
      offsetof(HeapCTypeWithWeakrefObject, weakreflist), READONLY},
    {NULL} /* Sentinel */
};

static void
heapctypewithweakref_dealloc(HeapCTypeWithWeakrefObject* self)
{

    PyTypeObject *tp = Py_TYPE(self);
    if (self->weakreflist != NULL)
        PyObject_ClearWeakRefs((PyObject *) self);
    Py_XDECREF(self->weakreflist);
    PyObject_Free(self);
    Py_DECREF(tp);
}

static PyType_Slot HeapCTypeWithWeakref_slots[] = {
    {Py_tp_members, heapctypewithweakref_members},
    {Py_tp_dealloc, heapctypewithweakref_dealloc},
    {0, 0},
};

static PyType_Spec HeapCTypeWithWeakref_spec = {
    "_testcapi.HeapCTypeWithWeakref",
    sizeof(HeapCTypeWithWeakrefObject),
    0,
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    HeapCTypeWithWeakref_slots
};

PyDoc_STRVAR(heapctypesetattr__doc__,
"A heap type without GC, but with overridden __setattr__.\n\n"
"The 'value' attribute is set to 10 in __init__ and updated via attribute setting.");

typedef struct {
    PyObject_HEAD
    long value;
} HeapCTypeSetattrObject;

static struct PyMemberDef heapctypesetattr_members[] = {
    {"pvalue", T_LONG, offsetof(HeapCTypeSetattrObject, value)},
    {NULL} /* Sentinel */
};

static int
heapctypesetattr_init(PyObject *self, PyObject *args, PyObject *kwargs)
{
    ((HeapCTypeSetattrObject *)self)->value = 10;
    return 0;
}

static void
heapctypesetattr_dealloc(HeapCTypeSetattrObject *self)
{
    PyTypeObject *tp = Py_TYPE(self);
    PyObject_Free(self);
    Py_DECREF(tp);
}

static int
heapctypesetattr_setattro(HeapCTypeSetattrObject *self, PyObject *attr, PyObject *value)
{
    PyObject *svalue = PyUnicode_FromString("value");
    if (svalue == NULL)
        return -1;
    int eq = PyObject_RichCompareBool(svalue, attr, Py_EQ);
    Py_DECREF(svalue);
    if (eq < 0)
        return -1;
    if (!eq) {
        return PyObject_GenericSetAttr((PyObject*) self, attr, value);
    }
    if (value == NULL) {
        self->value = 0;
        return 0;
    }
    PyObject *ivalue = PyNumber_Long(value);
    if (ivalue == NULL)
        return -1;
    long v = PyLong_AsLong(ivalue);
    Py_DECREF(ivalue);
    if (v == -1 && PyErr_Occurred())
        return -1;
    self->value = v;
    return 0;
}

static PyType_Slot HeapCTypeSetattr_slots[] = {
    {Py_tp_init, heapctypesetattr_init},
    {Py_tp_members, heapctypesetattr_members},
    {Py_tp_setattro, heapctypesetattr_setattro},
    {Py_tp_dealloc, heapctypesetattr_dealloc},
    {Py_tp_doc, (char*)heapctypesetattr__doc__},
    {0, 0},
};

static PyType_Spec HeapCTypeSetattr_spec = {
    "_testcapi.HeapCTypeSetattr",
    sizeof(HeapCTypeSetattrObject),
    0,
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    HeapCTypeSetattr_slots
};

static PyMethodDef meth_instance_methods[] = {
    {"meth_varargs", meth_varargs, METH_VARARGS},
    {"meth_varargs_keywords", (PyCFunction)(void(*)(void))meth_varargs_keywords, METH_VARARGS|METH_KEYWORDS},
    {"meth_o", meth_o, METH_O},
    {"meth_noargs", meth_noargs, METH_NOARGS},
    {"meth_fastcall", (PyCFunction)(void(*)(void))meth_fastcall, METH_FASTCALL},
    {"meth_fastcall_keywords", (PyCFunction)(void(*)(void))meth_fastcall_keywords, METH_FASTCALL|METH_KEYWORDS},
    {NULL, NULL} /* sentinel */
};


static PyTypeObject MethInstance_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "MethInstance",
    sizeof(PyObject),
    .tp_new = PyType_GenericNew,
    .tp_flags = Py_TPFLAGS_DEFAULT,
    .tp_methods = meth_instance_methods,
    .tp_doc = (char*)PyDoc_STR(
        "Class with normal (instance) methods to test calling conventions"),
};

static PyMethodDef meth_class_methods[] = {
    {"meth_varargs", meth_varargs, METH_VARARGS|METH_CLASS},
    {"meth_varargs_keywords", (PyCFunction)(void(*)(void))meth_varargs_keywords, METH_VARARGS|METH_KEYWORDS|METH_CLASS},
    {"meth_o", meth_o, METH_O|METH_CLASS},
    {"meth_noargs", meth_noargs, METH_NOARGS|METH_CLASS},
    {"meth_fastcall", (PyCFunction)(void(*)(void))meth_fastcall, METH_FASTCALL|METH_CLASS},
    {"meth_fastcall_keywords", (PyCFunction)(void(*)(void))meth_fastcall_keywords, METH_FASTCALL|METH_KEYWORDS|METH_CLASS},
    {NULL, NULL} /* sentinel */
};


static PyTypeObject MethClass_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "MethClass",
    sizeof(PyObject),
    .tp_new = PyType_GenericNew,
    .tp_flags = Py_TPFLAGS_DEFAULT,
    .tp_methods = meth_class_methods,
    .tp_doc = PyDoc_STR(
        "Class with class methods to test calling conventions"),
};

static PyMethodDef meth_static_methods[] = {
    {"meth_varargs", meth_varargs, METH_VARARGS|METH_STATIC},
    {"meth_varargs_keywords", (PyCFunction)(void(*)(void))meth_varargs_keywords, METH_VARARGS|METH_KEYWORDS|METH_STATIC},
    {"meth_o", meth_o, METH_O|METH_STATIC},
    {"meth_noargs", meth_noargs, METH_NOARGS|METH_STATIC},
    {"meth_fastcall", (PyCFunction)(void(*)(void))meth_fastcall, METH_FASTCALL|METH_STATIC},
    {"meth_fastcall_keywords", (PyCFunction)(void(*)(void))meth_fastcall_keywords, METH_FASTCALL|METH_KEYWORDS|METH_STATIC},
    {NULL, NULL} /* sentinel */
};


static PyTypeObject MethStatic_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "MethStatic",
    sizeof(PyObject),
    .tp_new = PyType_GenericNew,
    .tp_flags = Py_TPFLAGS_DEFAULT,
    .tp_methods = meth_static_methods,
    .tp_doc = PyDoc_STR(
        "Class with static methods to test calling conventions"),
};

/* ContainerNoGC -- a simple container without GC methods */

typedef struct {
    PyObject_HEAD
    PyObject *value;
} ContainerNoGCobject;

static PyObject *
ContainerNoGC_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
{
    PyObject *value;
    char *names[] = {"value", NULL};
    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O", names, &value)) {
        return NULL;
    }
    PyObject *self = type->tp_alloc(type, 0);
    if (self == NULL) {
        return NULL;
    }
    Py_INCREF(value);
    ((ContainerNoGCobject *)self)->value = value;
    return self;
}

static void
ContainerNoGC_dealloc(ContainerNoGCobject *self)
{
    Py_DECREF(self->value);
    Py_TYPE(self)->tp_free((PyObject *)self);
}

static PyMemberDef ContainerNoGC_members[] = {
    {"value", T_OBJECT, offsetof(ContainerNoGCobject, value), READONLY,
     PyDoc_STR("a container value for test purposes")},
    {0}
};

static PyTypeObject ContainerNoGC_type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "_testcapi.ContainerNoGC",
    sizeof(ContainerNoGCobject),
    .tp_dealloc = (destructor)ContainerNoGC_dealloc,
    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    .tp_members = ContainerNoGC_members,
    .tp_new = ContainerNoGC_new,
};


static struct PyModuleDef _testcapimodule = {
    PyModuleDef_HEAD_INIT,
    "_testcapi",
    NULL,
    -1,
    TestMethods,
    NULL,
    NULL,
    NULL,
    NULL
};

/* Per PEP 489, this module will not be converted to multi-phase initialization
 */

PyMODINIT_FUNC
PyInit__testcapi(void)
{
    PyObject *m;

    m = PyModule_Create(&_testcapimodule);
    if (m == NULL)
        return NULL;

    Py_SET_TYPE(&_HashInheritanceTester_Type, &PyType_Type);

    Py_SET_TYPE(&test_structmembersType, &PyType_Type);
    Py_INCREF(&test_structmembersType);
    /* don't use a name starting with "test", since we don't want
       test_capi to automatically call this */
    PyModule_AddObject(m, "_test_structmembersType", (PyObject *)&test_structmembersType);
    if (PyType_Ready(&matmulType) < 0)
        return NULL;
    Py_INCREF(&matmulType);
    PyModule_AddObject(m, "matmulType", (PyObject *)&matmulType);
    if (PyType_Ready(&ipowType) < 0) {
        return NULL;
    }
    Py_INCREF(&ipowType);
    PyModule_AddObject(m, "ipowType", (PyObject *)&ipowType);

    if (PyType_Ready(&awaitType) < 0)
        return NULL;
    Py_INCREF(&awaitType);
    PyModule_AddObject(m, "awaitType", (PyObject *)&awaitType);

    MyList_Type.tp_base = &PyList_Type;
    if (PyType_Ready(&MyList_Type) < 0)
        return NULL;
    Py_INCREF(&MyList_Type);
    PyModule_AddObject(m, "MyList", (PyObject *)&MyList_Type);

    if (PyType_Ready(&MethodDescriptorBase_Type) < 0)
        return NULL;
    Py_INCREF(&MethodDescriptorBase_Type);
    PyModule_AddObject(m, "MethodDescriptorBase", (PyObject *)&MethodDescriptorBase_Type);

    MethodDescriptorDerived_Type.tp_base = &MethodDescriptorBase_Type;
    if (PyType_Ready(&MethodDescriptorDerived_Type) < 0)
        return NULL;
    Py_INCREF(&MethodDescriptorDerived_Type);
    PyModule_AddObject(m, "MethodDescriptorDerived", (PyObject *)&MethodDescriptorDerived_Type);

    MethodDescriptorNopGet_Type.tp_base = &MethodDescriptorBase_Type;
    if (PyType_Ready(&MethodDescriptorNopGet_Type) < 0)
        return NULL;
    Py_INCREF(&MethodDescriptorNopGet_Type);
    PyModule_AddObject(m, "MethodDescriptorNopGet", (PyObject *)&MethodDescriptorNopGet_Type);

    MethodDescriptor2_Type.tp_base = &MethodDescriptorBase_Type;
    if (PyType_Ready(&MethodDescriptor2_Type) < 0)
        return NULL;
    Py_INCREF(&MethodDescriptor2_Type);
    PyModule_AddObject(m, "MethodDescriptor2", (PyObject *)&MethodDescriptor2_Type);

    if (PyType_Ready(&GenericAlias_Type) < 0)
        return NULL;
    Py_INCREF(&GenericAlias_Type);
    PyModule_AddObject(m, "GenericAlias", (PyObject *)&GenericAlias_Type);

    if (PyType_Ready(&Generic_Type) < 0)
        return NULL;
    Py_INCREF(&Generic_Type);
    PyModule_AddObject(m, "Generic", (PyObject *)&Generic_Type);

    if (PyType_Ready(&MethInstance_Type) < 0)
        return NULL;
    Py_INCREF(&MethInstance_Type);
    PyModule_AddObject(m, "MethInstance", (PyObject *)&MethInstance_Type);

    if (PyType_Ready(&MethClass_Type) < 0)
        return NULL;
    Py_INCREF(&MethClass_Type);
    PyModule_AddObject(m, "MethClass", (PyObject *)&MethClass_Type);

    if (PyType_Ready(&MethStatic_Type) < 0)
        return NULL;
    Py_INCREF(&MethStatic_Type);
    PyModule_AddObject(m, "MethStatic", (PyObject *)&MethStatic_Type);

    PyRecursingInfinitelyError_Type.tp_base = (PyTypeObject *)PyExc_Exception;
    if (PyType_Ready(&PyRecursingInfinitelyError_Type) < 0) {
        return NULL;
    }
    Py_INCREF(&PyRecursingInfinitelyError_Type);
    PyModule_AddObject(m, "RecursingInfinitelyError",
                       (PyObject *)&PyRecursingInfinitelyError_Type);

    PyModule_AddObject(m, "CHAR_MAX", PyLong_FromLong(CHAR_MAX));
    PyModule_AddObject(m, "CHAR_MIN", PyLong_FromLong(CHAR_MIN));
    PyModule_AddObject(m, "UCHAR_MAX", PyLong_FromLong(UCHAR_MAX));
    PyModule_AddObject(m, "SHRT_MAX", PyLong_FromLong(SHRT_MAX));
    PyModule_AddObject(m, "SHRT_MIN", PyLong_FromLong(SHRT_MIN));
    PyModule_AddObject(m, "USHRT_MAX", PyLong_FromLong(USHRT_MAX));
    PyModule_AddObject(m, "INT_MAX",  PyLong_FromLong(INT_MAX));
    PyModule_AddObject(m, "INT_MIN",  PyLong_FromLong(INT_MIN));
    PyModule_AddObject(m, "UINT_MAX",  PyLong_FromUnsignedLong(UINT_MAX));
    PyModule_AddObject(m, "LONG_MAX", PyLong_FromLong(LONG_MAX));
    PyModule_AddObject(m, "LONG_MIN", PyLong_FromLong(LONG_MIN));
    PyModule_AddObject(m, "ULONG_MAX", PyLong_FromUnsignedLong(ULONG_MAX));
    PyModule_AddObject(m, "FLT_MAX", PyFloat_FromDouble(FLT_MAX));
    PyModule_AddObject(m, "FLT_MIN", PyFloat_FromDouble(FLT_MIN));
    PyModule_AddObject(m, "DBL_MAX", PyFloat_FromDouble(DBL_MAX));
    PyModule_AddObject(m, "DBL_MIN", PyFloat_FromDouble(DBL_MIN));
    PyModule_AddObject(m, "LLONG_MAX", PyLong_FromLongLong(LLONG_MAX));
    PyModule_AddObject(m, "LLONG_MIN", PyLong_FromLongLong(LLONG_MIN));
    PyModule_AddObject(m, "ULLONG_MAX", PyLong_FromUnsignedLongLong(ULLONG_MAX));
    PyModule_AddObject(m, "PY_SSIZE_T_MAX", PyLong_FromSsize_t(PY_SSIZE_T_MAX));
    PyModule_AddObject(m, "PY_SSIZE_T_MIN", PyLong_FromSsize_t(PY_SSIZE_T_MIN));
    PyModule_AddObject(m, "SIZEOF_TIME_T", PyLong_FromSsize_t(sizeof(time_t)));
    PyModule_AddObject(m, "Py_Version", PyLong_FromUnsignedLong(Py_Version));
    Py_INCREF(&PyInstanceMethod_Type);
    PyModule_AddObject(m, "instancemethod", (PyObject *)&PyInstanceMethod_Type);

    PyModule_AddIntConstant(m, "the_number_three", 3);
    PyObject *v;
#ifdef WITH_PYMALLOC
    v = Py_True;
#else
    v = Py_False;
#endif
    Py_INCREF(v);
    PyModule_AddObject(m, "WITH_PYMALLOC", v);

    TestError = PyErr_NewException("_testcapi.error", NULL, NULL);
    Py_INCREF(TestError);
    PyModule_AddObject(m, "error", TestError);

    PyObject *HeapDocCType = PyType_FromSpec(&HeapDocCType_spec);
    if (HeapDocCType == NULL) {
        return NULL;
    }
    PyModule_AddObject(m, "HeapDocCType", HeapDocCType);

    /* bpo-41832: Add a new type to test PyType_FromSpec()
       now can accept a NULL tp_doc slot. */
    PyObject *NullTpDocType = PyType_FromSpec(&NullTpDocType_spec);
    if (NullTpDocType == NULL) {
        return NULL;
    }
    PyModule_AddObject(m, "NullTpDocType", NullTpDocType);

    PyObject *HeapGcCType = PyType_FromSpec(&HeapGcCType_spec);
    if (HeapGcCType == NULL) {
        return NULL;
    }
    PyModule_AddObject(m, "HeapGcCType", HeapGcCType);

    PyObject *HeapCType = PyType_FromSpec(&HeapCType_spec);
    if (HeapCType == NULL) {
        return NULL;
    }
    PyObject *subclass_bases = PyTuple_Pack(1, HeapCType);
    if (subclass_bases == NULL) {
        return NULL;
    }
    PyObject *HeapCTypeSubclass = PyType_FromSpecWithBases(&HeapCTypeSubclass_spec, subclass_bases);
    if (HeapCTypeSubclass == NULL) {
        return NULL;
    }
    Py_DECREF(subclass_bases);
    PyModule_AddObject(m, "HeapCTypeSubclass", HeapCTypeSubclass);

    PyObject *HeapCTypeWithDict = PyType_FromSpec(&HeapCTypeWithDict_spec);
    if (HeapCTypeWithDict == NULL) {
        return NULL;
    }
    PyModule_AddObject(m, "HeapCTypeWithDict", HeapCTypeWithDict);

    PyObject *HeapCTypeWithNegativeDict = PyType_FromSpec(&HeapCTypeWithNegativeDict_spec);
    if (HeapCTypeWithNegativeDict == NULL) {
        return NULL;
    }
    PyModule_AddObject(m, "HeapCTypeWithNegativeDict", HeapCTypeWithNegativeDict);

    PyObject *HeapCTypeWithWeakref = PyType_FromSpec(&HeapCTypeWithWeakref_spec);
    if (HeapCTypeWithWeakref == NULL) {
        return NULL;
    }
    PyModule_AddObject(m, "HeapCTypeWithWeakref", HeapCTypeWithWeakref);

    PyObject *HeapCTypeWithBuffer = PyType_FromSpec(&HeapCTypeWithBuffer_spec);
    if (HeapCTypeWithBuffer == NULL) {
        return NULL;
    }
    PyModule_AddObject(m, "HeapCTypeWithBuffer", HeapCTypeWithBuffer);

    PyObject *HeapCTypeSetattr = PyType_FromSpec(&HeapCTypeSetattr_spec);
    if (HeapCTypeSetattr == NULL) {
        return NULL;
    }
    PyModule_AddObject(m, "HeapCTypeSetattr", HeapCTypeSetattr);

    PyObject *subclass_with_finalizer_bases = PyTuple_Pack(1, HeapCTypeSubclass);
    if (subclass_with_finalizer_bases == NULL) {
        return NULL;
    }
    PyObject *HeapCTypeSubclassWithFinalizer = PyType_FromSpecWithBases(
        &HeapCTypeSubclassWithFinalizer_spec, subclass_with_finalizer_bases);
    if (HeapCTypeSubclassWithFinalizer == NULL) {
        return NULL;
    }
    Py_DECREF(subclass_with_finalizer_bases);
    PyModule_AddObject(m, "HeapCTypeSubclassWithFinalizer", HeapCTypeSubclassWithFinalizer);

    if (PyType_Ready(&ContainerNoGC_type) < 0) {
        return NULL;
    }
    Py_INCREF(&ContainerNoGC_type);
    if (PyModule_AddObject(m, "ContainerNoGC",
                           (PyObject *) &ContainerNoGC_type) < 0)
        return NULL;

    PyState_AddModule(m, &_testcapimodule);
    return m;
}

static PyObject *
negative_dictoffset(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    return PyType_FromSpec(&HeapCTypeWithNegativeDict_spec);
}

/* Test the C API exposed when PY_SSIZE_T_CLEAN is not defined */

#undef Py_BuildValue
PyAPI_FUNC(PyObject *) Py_BuildValue(const char *, ...);

static PyObject *
test_buildvalue_issue38913(PyObject *self, PyObject *Py_UNUSED(ignored))
{
    PyObject *res;
    const char str[] = "string";
    const Py_UNICODE unicode[] = L"unicode";
    assert(!PyErr_Occurred());

    res = Py_BuildValue("(s#O)", str, 1, Py_None);
    assert(res == NULL);
    if (!PyErr_ExceptionMatches(PyExc_SystemError)) {
        return NULL;
    }
    PyErr_Clear();

    res = Py_BuildValue("(z#O)", str, 1, Py_None);
    assert(res == NULL);
    if (!PyErr_ExceptionMatches(PyExc_SystemError)) {
        return NULL;
    }
    PyErr_Clear();

    res = Py_BuildValue("(y#O)", str, 1, Py_None);
    assert(res == NULL);
    if (!PyErr_ExceptionMatches(PyExc_SystemError)) {
        return NULL;
    }
    PyErr_Clear();

    res = Py_BuildValue("(u#O)", unicode, 1, Py_None);
    assert(res == NULL);
    if (!PyErr_ExceptionMatches(PyExc_SystemError)) {
        return NULL;
    }
    PyErr_Clear();


    Py_RETURN_NONE;
}

#undef PyArg_ParseTupleAndKeywords
PyAPI_FUNC(int) PyArg_ParseTupleAndKeywords(PyObject *, PyObject *,
                                            const char *, char **, ...);

static PyObject *
getargs_s_hash_int(PyObject *self, PyObject *args, PyObject *kwargs)
{
    static char *keywords[] = {"", "x", NULL};
    const char *s;
    int len;
    int i = 0;
    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|s#i", keywords, &s, &len, &i))
        return NULL;
    Py_RETURN_NONE;
}