#include "Python.h"

#include "pycore_pymem.h"

#include "pycore_pystate.h"

#include "pycore_tupleobject.h"

#include "structmember.h"

typedef struct {

PyObject_HEAD

PyObject *fn;

PyObject *args;

PyObject *kw;

PyObject *dict;

PyObject *weakreflist; /* List of weak references */

int use_fastcall;

} partialobject;

static PyTypeObject partial_type;

static PyObject *

partial_new(PyTypeObject *type, PyObject *args, PyObject *kw)

{

PyObject *func, *pargs, *nargs, *pkw;

partialobject *pto;

if (PyTuple_GET_SIZE(args) < 1) {

PyErr_SetString(PyExc_TypeError,

"type 'partial' takes at least one argument");

return NULL;

}

pargs = pkw = NULL;

func = PyTuple_GET_ITEM(args, 0);

if (Py_TYPE(func) == &partial_type && type == &partial_type) {

partialobject *part = (partialobject *)func;

if (part->dict == NULL) {

pargs = part->args;

pkw = part->kw;

func = part->fn;

assert(PyTuple_Check(pargs));

assert(PyDict_Check(pkw));

}

}

if (!PyCallable_Check(func)) {

PyErr_SetString(PyExc_TypeError,

"the first argument must be callable");

return NULL;

}

/* create partialobject structure */

pto = (partialobject *)type->tp_alloc(type, 0);

if (pto == NULL)

return NULL;

pto->fn = func;

Py_INCREF(func);

nargs = PyTuple_GetSlice(args, 1, PY_SSIZE_T_MAX);

if (nargs == NULL) {

Py_DECREF(pto);

return NULL;

}

if (pargs == NULL) {

pto->args = nargs;

}

else {

pto->args = PySequence_Concat(pargs, nargs);

Py_DECREF(nargs);

if (pto->args == NULL) {

Py_DECREF(pto);

return NULL;

}

assert(PyTuple_Check(pto->args));

}

if (pkw == NULL || PyDict_GET_SIZE(pkw) == 0) {

if (kw == NULL) {

pto->kw = PyDict_New();

}

else if (Py_REFCNT(kw) == 1) {

Py_INCREF(kw);

pto->kw = kw;

}

else {

pto->kw = PyDict_Copy(kw);

}

}

else {

pto->kw = PyDict_Copy(pkw);

if (kw != NULL && pto->kw != NULL) {

if (PyDict_Merge(pto->kw, kw, 1) != 0) {

Py_DECREF(pto);

return NULL;

}

}

}

if (pto->kw == NULL) {

Py_DECREF(pto);

return NULL;

}

pto->use_fastcall = _PyObject_HasFastCall(func);

return (PyObject *)pto;

}

static void

partial_dealloc(partialobject *pto)

{

/* bpo-31095: UnTrack is needed before calling any callbacks */

PyObject_GC_UnTrack(pto);

if (pto->weakreflist != NULL)

PyObject_ClearWeakRefs((PyObject *) pto);

Py_XDECREF(pto->fn);

Py_XDECREF(pto->args);

Py_XDECREF(pto->kw);

Py_XDECREF(pto->dict);

Py_TYPE(pto)->tp_free(pto);

}

static PyObject *

partial_fastcall(partialobject *pto, PyObject **args, Py_ssize_t nargs,

PyObject *kwargs)

{

PyObject *small_stack[_PY_FASTCALL_SMALL_STACK];

PyObject *ret;

PyObject **stack, **stack_buf = NULL;

Py_ssize_t nargs2, pto_nargs;

pto_nargs = PyTuple_GET_SIZE(pto->args);

nargs2 = pto_nargs + nargs;

if (pto_nargs == 0) {

stack = args;

}

else if (nargs == 0) {

stack = _PyTuple_ITEMS(pto->args);

}

else {

if (nargs2 <= (Py_ssize_t)Py_ARRAY_LENGTH(small_stack)) {

stack = small_stack;

}

else {

stack_buf = PyMem_Malloc(nargs2 * sizeof(PyObject *));

if (stack_buf == NULL) {

PyErr_NoMemory();

return NULL;

}

stack = stack_buf;

}

/* use borrowed references */

memcpy(stack,

_PyTuple_ITEMS(pto->args),

pto_nargs * sizeof(PyObject*));

memcpy(&stack[pto_nargs],

args,

nargs * sizeof(PyObject*));

}

ret = _PyObject_FastCallDict(pto->fn, stack, nargs2, kwargs);

PyMem_Free(stack_buf);

return ret;

}

static PyObject *

partial_call_impl(partialobject *pto, PyObject *args, PyObject *kwargs)

{

PyObject *ret, *args2;

/* Note: tupleconcat() is optimized for empty tuples */

args2 = PySequence_Concat(pto->args, args);

if (args2 == NULL) {

return NULL;

}

assert(PyTuple_Check(args2));

ret = PyObject_Call(pto->fn, args2, kwargs);

Py_DECREF(args2);

return ret;

}

static PyObject *

partial_call(partialobject *pto, PyObject *args, PyObject *kwargs)

{

PyObject *kwargs2, *res;

assert (PyCallable_Check(pto->fn));

assert (PyTuple_Check(pto->args));

assert (PyDict_Check(pto->kw));

if (PyDict_GET_SIZE(pto->kw) == 0) {

/* kwargs can be NULL */

kwargs2 = kwargs;

Py_XINCREF(kwargs2);

}

else {

/* bpo-27840, bpo-29318: dictionary of keyword parameters must be

kwargs2 = PyDict_Copy(pto->kw);

if (kwargs2 == NULL) {

return NULL;

}

if (kwargs != NULL) {

if (PyDict_Merge(kwargs2, kwargs, 1) != 0) {

Py_DECREF(kwargs2);

return NULL;

}

}

}

if (pto->use_fastcall) {

res = partial_fastcall(pto,

_PyTuple_ITEMS(args),

PyTuple_GET_SIZE(args),

kwargs2);

}

else {

res = partial_call_impl(pto, args, kwargs2);

}

Py_XDECREF(kwargs2);

return res;

}

static int

partial_traverse(partialobject *pto, visitproc visit, void *arg)

{

Py_VISIT(pto->fn);

Py_VISIT(pto->args);

Py_VISIT(pto->kw);

Py_VISIT(pto->dict);

return 0;

}

PyDoc_STRVAR(partial_doc,

of the given arguments and keywords.\n");

#define OFF(x) offsetof(partialobject, x)

static PyMemberDef partial_memberlist[] = {

{"func", T_OBJECT, OFF(fn), READONLY,

"function object to use in future partial calls"},

{"args", T_OBJECT, OFF(args), READONLY,

"tuple of arguments to future partial calls"},

{"keywords", T_OBJECT, OFF(kw), READONLY,

"dictionary of keyword arguments to future partial calls"},

{NULL} /* Sentinel */

};

static PyGetSetDef partial_getsetlist[] = {

{"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict},

{NULL} /* Sentinel */

};

static PyObject *

partial_repr(partialobject *pto)

{

PyObject *result = NULL;

PyObject *arglist;

Py_ssize_t i, n;

PyObject *key, *value;

int status;

status = Py_ReprEnter((PyObject *)pto);

if (status != 0) {

if (status < 0)

return NULL;

return PyUnicode_FromString("...");

}

arglist = PyUnicode_FromString("");

if (arglist == NULL)

goto done;

/* Pack positional arguments */

assert (PyTuple_Check(pto->args));

n = PyTuple_GET_SIZE(pto->args);

for (i = 0; i < n; i++) {

Py_SETREF(arglist, PyUnicode_FromFormat("%U, %R", arglist,

PyTuple_GET_ITEM(pto->args, i)));

if (arglist == NULL)

goto done;

}

/* Pack keyword arguments */

assert (PyDict_Check(pto->kw));

for (i = 0; PyDict_Next(pto->kw, &i, &key, &value);) {

/* Prevent key.__str__ from deleting the value. */

Py_INCREF(value);

Py_SETREF(arglist, PyUnicode_FromFormat("%U, %S=%R", arglist,

key, value));

Py_DECREF(value);

if (arglist == NULL)

goto done;

}

result = PyUnicode_FromFormat("%s(%R%U)", Py_TYPE(pto)->tp_name,

pto->fn, arglist);

Py_DECREF(arglist);

done:

Py_ReprLeave((PyObject *)pto);

return result;

}

static PyObject *

partial_reduce(partialobject *pto, PyObject *unused)

{

return Py_BuildValue("O(O)(OOOO)", Py_TYPE(pto), pto->fn, pto->fn,

pto->args, pto->kw,

pto->dict ? pto->dict : Py_None);

}

static PyObject *

partial_setstate(partialobject *pto, PyObject *state)

{

PyObject *fn, *fnargs, *kw, *dict;

if (!PyTuple_Check(state) ||

!PyArg_ParseTuple(state, "OOOO", &fn, &fnargs, &kw, &dict) ||

!PyCallable_Check(fn) ||

!PyTuple_Check(fnargs) ||

(kw != Py_None && !PyDict_Check(kw)))

{

PyErr_SetString(PyExc_TypeError, "invalid partial state");

return NULL;

}

if(!PyTuple_CheckExact(fnargs))

fnargs = PySequence_Tuple(fnargs);

else

Py_INCREF(fnargs);

if (fnargs == NULL)

return NULL;

if (kw == Py_None)

kw = PyDict_New();

else if(!PyDict_CheckExact(kw))

kw = PyDict_Copy(kw);

else

Py_INCREF(kw);

if (kw == NULL) {

Py_DECREF(fnargs);

return NULL;

}

if (dict == Py_None)

dict = NULL;

else

Py_INCREF(dict);

Py_INCREF(fn);

pto->use_fastcall = _PyObject_HasFastCall(fn);

Py_SETREF(pto->fn, fn);

Py_SETREF(pto->args, fnargs);

Py_SETREF(pto->kw, kw);

Py_XSETREF(pto->dict, dict);

Py_RETURN_NONE;

}

static PyMethodDef partial_methods[] = {

{"__reduce__", (PyCFunction)partial_reduce, METH_NOARGS},

{"__setstate__", (PyCFunction)partial_setstate, METH_O},

{NULL, NULL} /* sentinel */

};

static PyTypeObject partial_type = {

PyVarObject_HEAD_INIT(NULL, 0)

"functools.partial", /* tp_name */

sizeof(partialobject), /* tp_basicsize */

0, /* tp_itemsize */

/* methods */

(destructor)partial_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_reserved */

(reprfunc)partial_repr, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /* tp_hash */

(ternaryfunc)partial_call, /* tp_call */

0, /* tp_str */

PyObject_GenericGetAttr, /* tp_getattro */

PyObject_GenericSetAttr, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |

Py_TPFLAGS_BASETYPE, /* tp_flags */

partial_doc, /* tp_doc */

(traverseproc)partial_traverse, /* tp_traverse */

0, /* tp_clear */

0, /* tp_richcompare */

offsetof(partialobject, weakreflist), /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

partial_methods, /* tp_methods */

partial_memberlist, /* tp_members */

partial_getsetlist, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

offsetof(partialobject, dict), /* tp_dictoffset */

0, /* tp_init */

0, /* tp_alloc */

partial_new, /* tp_new */

PyObject_GC_Del, /* tp_free */

};

typedef struct {

PyObject_HEAD

PyObject *cmp;

PyObject *object;

} keyobject;

static void

keyobject_dealloc(keyobject *ko)

{

Py_DECREF(ko->cmp);

Py_XDECREF(ko->object);

PyObject_FREE(ko);

}

static int

keyobject_traverse(keyobject *ko, visitproc visit, void *arg)

{

Py_VISIT(ko->cmp);

if (ko->object)

Py_VISIT(ko->object);

return 0;

}

static int

keyobject_clear(keyobject *ko)

{

Py_CLEAR(ko->cmp);

if (ko->object)

Py_CLEAR(ko->object);

return 0;

}

static PyMemberDef keyobject_members[] = {

{"obj", T_OBJECT,

offsetof(keyobject, object), 0,

PyDoc_STR("Value wrapped by a key function.")},

{NULL}

};

static PyObject *

keyobject_call(keyobject *ko, PyObject *args, PyObject *kwds);

static PyObject *

keyobject_richcompare(PyObject *ko, PyObject *other, int op);

static PyTypeObject keyobject_type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"functools.KeyWrapper", /* tp_name */

sizeof(keyobject), /* tp_basicsize */

0, /* tp_itemsize */

/* methods */

(destructor)keyobject_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_reserved */

0, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /* tp_hash */

(ternaryfunc)keyobject_call, /* tp_call */

0, /* tp_str */

PyObject_GenericGetAttr, /* tp_getattro */

0, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT, /* tp_flags */

0, /* tp_doc */

(traverseproc)keyobject_traverse, /* tp_traverse */

(inquiry)keyobject_clear, /* tp_clear */

keyobject_richcompare, /* tp_richcompare */

0, /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

0, /* tp_methods */

keyobject_members, /* tp_members */

0, /* tp_getset */

};

static PyObject *

keyobject_call(keyobject *ko, PyObject *args, PyObject *kwds)

{

PyObject *object;

keyobject *result;

static char *kwargs[] = {"obj", NULL};

if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:K", kwargs, &object))

return NULL;

result = PyObject_New(keyobject, &keyobject_type);

if (!result)

return NULL;

Py_INCREF(ko->cmp);

result->cmp = ko->cmp;

Py_INCREF(object);

result->object = object;

return (PyObject *)result;

}

static PyObject *

keyobject_richcompare(PyObject *ko, PyObject *other, int op)

{

PyObject *res;

PyObject *x;

PyObject *y;

PyObject *compare;

PyObject *answer;

PyObject* stack[2];

if (Py_TYPE(other) != &keyobject_type){

PyErr_Format(PyExc_TypeError, "other argument must be K instance");

return NULL;

}

compare = ((keyobject *) ko)->cmp;

assert(compare != NULL);

x = ((keyobject *) ko)->object;

y = ((keyobject *) other)->object;

if (!x || !y){

PyErr_Format(PyExc_AttributeError, "object");

return NULL;

}

/* Call the user's comparison function and translate the 3-way

stack[0] = x;

stack[1] = y;

res = _PyObject_FastCall(compare, stack, 2);

if (res == NULL) {

return NULL;

}

answer = PyObject_RichCompare(res, _PyLong_Zero, op);

Py_DECREF(res);

return answer;

}

static PyObject *

functools_cmp_to_key(PyObject *self, PyObject *args, PyObject *kwds)

{

PyObject *cmp;

static char *kwargs[] = {"mycmp", NULL};

keyobject *object;

if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:cmp_to_key", kwargs, &cmp))

return NULL;

object = PyObject_New(keyobject, &keyobject_type);

if (!object)

return NULL;

Py_INCREF(cmp);

object->cmp = cmp;

object->object = NULL;

return (PyObject *)object;

}

PyDoc_STRVAR(functools_cmp_to_key_doc,

"Convert a cmp= function into a key= function.");

static PyObject *

functools_reduce(PyObject *self, PyObject *args)

{

PyObject *seq, *func, *result = NULL, *it;

if (!PyArg_UnpackTuple(args, "reduce", 2, 3, &func, &seq, &result))

return NULL;

if (result != NULL)

Py_INCREF(result);

it = PyObject_GetIter(seq);

if (it == NULL) {

if (PyErr_ExceptionMatches(PyExc_TypeError))

PyErr_SetString(PyExc_TypeError,

"reduce() arg 2 must support iteration");

Py_XDECREF(result);

return NULL;

}

if ((args = PyTuple_New(2)) == NULL)

goto Fail;

for (;;) {

PyObject *op2;

if (args->ob_refcnt > 1) {

Py_DECREF(args);

if ((args = PyTuple_New(2)) == NULL)

goto Fail;

}

op2 = PyIter_Next(it);

if (op2 == NULL) {

if (PyErr_Occurred())

goto Fail;

break;

}

if (result == NULL)

result = op2;

else {

PyTuple_SetItem(args, 0, result);

PyTuple_SetItem(args, 1, op2);

if ((result = PyEval_CallObject(func, args)) == NULL)

goto Fail;

}

}

Py_DECREF(args);

if (result == NULL)

PyErr_SetString(PyExc_TypeError,

"reduce() of empty sequence with no initial value");

Py_DECREF(it);

return result;

Fail:

Py_XDECREF(args);

Py_XDECREF(result);

Py_DECREF(it);

return NULL;

}

PyDoc_STRVAR(functools_reduce_doc,

sequence is empty.");

static PyObject *kwd_mark = NULL;

struct lru_list_elem;

struct lru_cache_object;

typedef struct lru_list_elem {

} lru_list_elem;

static void

lru_list_elem_dealloc(lru_list_elem *link)

{

Py_XDECREF(link->key);

Py_XDECREF(link->result);

PyObject_Del(link);

}

static PyTypeObject lru_list_elem_type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"functools._lru_list_elem", /* tp_name */

sizeof(lru_list_elem), /* tp_basicsize */

0, /* tp_itemsize */

/* methods */

(destructor)lru_list_elem_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_reserved */

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, /* tp_flags */

};

typedef PyObject *(*lru_cache_ternaryfunc)(struct lru_cache_object *, PyObject *, PyObject *);

typedef struct lru_cache_object {

} lru_cache_object;

static PyTypeObject lru_cache_type;

static PyObject *

lru_cache_make_key(PyObject *args, PyObject *kwds, int typed)

{

PyObject *key, *keyword, *value;

Py_ssize_t key_size, pos, key_pos, kwds_size;

/* short path, key will match args anyway, which is a tuple */

if (!typed && !kwds) {

if (PyTuple_GET_SIZE(args) == 1) {

key = PyTuple_GET_ITEM(args, 0);

if (PyUnicode_CheckExact(key) || PyLong_CheckExact(key)) {

/* For common scalar keys, save space by

Py_INCREF(key);

return key;

}

}

Py_INCREF(args);

return args;

}

kwds_size = kwds ? PyDict_GET_SIZE(kwds) : 0;

assert(kwds_size >= 0);

key_size = PyTuple_GET_SIZE(args);

if (kwds_size)

key_size += kwds_size * 2 + 1;

if (typed)

key_size += PyTuple_GET_SIZE(args) + kwds_size;

key = PyTuple_New(key_size);

if (key == NULL)

return NULL;

key_pos = 0;

for (pos = 0; pos < PyTuple_GET_SIZE(args); ++pos) {

PyObject *item = PyTuple_GET_ITEM(args, pos);

Py_INCREF(item);

PyTuple_SET_ITEM(key, key_pos++, item);

}

if (kwds_size) {

Py_INCREF(kwd_mark);

PyTuple_SET_ITEM(key, key_pos++, kwd_mark);

for (pos = 0; PyDict_Next(kwds, &pos, &keyword, &value);) {

Py_INCREF(keyword);

PyTuple_SET_ITEM(key, key_pos++, keyword);

Py_INCREF(value);

PyTuple_SET_ITEM(key, key_pos++, value);

}

assert(key_pos == PyTuple_GET_SIZE(args) + kwds_size * 2 + 1);

}

if (typed) {

for (pos = 0; pos < PyTuple_GET_SIZE(args); ++pos) {

PyObject *item = (PyObject *)Py_TYPE(PyTuple_GET_ITEM(args, pos));

Py_INCREF(item);

PyTuple_SET_ITEM(key, key_pos++, item);

}

if (kwds_size) {

for (pos = 0; PyDict_Next(kwds, &pos, &keyword, &value);) {

PyObject *item = (PyObject *)Py_TYPE(value);

Py_INCREF(item);

PyTuple_SET_ITEM(key, key_pos++, item);

}

}

}

assert(key_pos == key_size);

return key;

}

static PyObject *

uncached_lru_cache_wrapper(lru_cache_object *self, PyObject *args, PyObject *kwds)

{

PyObject *result;

self->misses++;

result = PyObject_Call(self->func, args, kwds);

if (!result)

return NULL;

return result;

}

static PyObject *

infinite_lru_cache_wrapper(lru_cache_object *self, PyObject *args, PyObject *kwds)

{

PyObject *result;

Py_hash_t hash;

PyObject *key = lru_cache_make_key(args, kwds, self->typed);

if (!key)

return NULL;

hash = PyObject_Hash(key);

if (hash == -1) {

Py_DECREF(key);

return NULL;

}

result = _PyDict_GetItem_KnownHash(self->cache, key, hash);

if (result) {

Py_INCREF(result);

self->hits++;

Py_DECREF(key);

return result;

}

if (PyErr_Occurred()) {

Py_DECREF(key);

return NULL;

}

self->misses++;

result = PyObject_Call(self->func, args, kwds);

if (!result) {

Py_DECREF(key);

return NULL;

}

if (_PyDict_SetItem_KnownHash(self->cache, key, result, hash) < 0) {

Py_DECREF(result);

Py_DECREF(key);

return NULL;

}

Py_DECREF(key);

return result;

}

static void

lru_cache_extract_link(lru_list_elem *link)

{

lru_list_elem *link_prev = link->prev;

lru_list_elem *link_next = link->next;

link_prev->next = link->next;

link_next->prev = link->prev;

}

static void

lru_cache_append_link(lru_cache_object *self, lru_list_elem *link)

{

lru_list_elem *root = &self->root;

lru_list_elem *last = root->prev;

last->next = root->prev = link;

link->prev = last;

link->next = root;

}

static void

lru_cache_prepend_link(lru_cache_object *self, lru_list_elem *link)

{

lru_list_elem *root = &self->root;

lru_list_elem *first = root->next;

first->prev = root->next = link;

link->prev = root;

link->next = first;

}

static PyObject *

bounded_lru_cache_wrapper(lru_cache_object *self, PyObject *args, PyObject *kwds)

{

lru_list_elem *link;

PyObject *key, *result, *testresult;

Py_hash_t hash;

key = lru_cache_make_key(args, kwds, self->typed);

if (!key)

return NULL;

hash = PyObject_Hash(key);

if (hash == -1) {

Py_DECREF(key);

return NULL;

}

link = (lru_list_elem *)_PyDict_GetItem_KnownHash(self->cache, key, hash);

if (link != NULL) {

lru_cache_extract_link(link);

lru_cache_append_link(self, link);

result = link->result;

self->hits++;

Py_INCREF(result);

Py_DECREF(key);

return result;

}

if (PyErr_Occurred()) {

Py_DECREF(key);

return NULL;

}

self->misses++;

result = PyObject_Call(self->func, args, kwds);

if (!result) {

Py_DECREF(key);

return NULL;

}

testresult = _PyDict_GetItem_KnownHash(self->cache, key, hash);

if (testresult != NULL) {

/* Getting here means that this same key was added to the cache

Py_DECREF(key);

return result;

}

if (PyErr_Occurred()) {

/* This is an unusual case since this same lookup

Py_DECREF(key);

Py_DECREF(result);

return NULL;

}

/* This is the normal case. The new key wasn't found before

assert(self->maxsize > 0);

if (PyDict_GET_SIZE(self->cache) < self->maxsize ||

self->root.next == &self->root)

{

/* Cache is not full, so put the result in a new link */

link = (lru_list_elem *)PyObject_New(lru_list_elem,

&lru_list_elem_type);

if (link == NULL) {

Py_DECREF(key);

Py_DECREF(result);

return NULL;

}

link->hash = hash;

link->key = key;

link->result = result;

/* What is really needed here is a SetItem variant with a "no clobber"

if (_PyDict_SetItem_KnownHash(self->cache, key, (PyObject *)link,

hash) < 0) {

Py_DECREF(link);

return NULL;

}

lru_cache_append_link(self, link);

Py_INCREF(result); /* for return */

return result;

}

/* Since the cache is full, we need to evict an old key and add