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listobject.c
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3513 lines (3124 loc) · 102 KB
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/* List object implementation */
#include "Python.h"
#include "pycore_abstract.h" // _PyIndex_Check()
#include "pycore_interp.h" // PyInterpreterState.list
#include "pycore_list.h" // struct _Py_list_state
#include "pycore_object.h" // _PyObject_GC_TRACK()
#include "pycore_tuple.h" // _PyTuple_FromArray()
#include <stddef.h>
/*[clinic input]
class list "PyListObject *" "&PyList_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=f9b222678f9f71e0]*/
#include "clinic/listobject.c.h"
_Py_DECLARE_STR(list_err, "list index out of range");
#if PyList_MAXFREELIST > 0
static struct _Py_list_state *
get_list_state(void)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
return &interp->list;
}
#endif
/* Ensure ob_item has room for at least newsize elements, and set
* ob_size to newsize. If newsize > ob_size on entry, the content
* of the new slots at exit is undefined heap trash; it's the caller's
* responsibility to overwrite them with sane values.
* The number of allocated elements may grow, shrink, or stay the same.
* Failure is impossible if newsize <= self.allocated on entry, although
* that partly relies on an assumption that the system realloc() never
* fails when passed a number of bytes <= the number of bytes last
* allocated (the C standard doesn't guarantee this, but it's hard to
* imagine a realloc implementation where it wouldn't be true).
* Note that self->ob_item may change, and even if newsize is less
* than ob_size on entry.
*/
static int
list_resize(PyListObject *self, Py_ssize_t newsize)
{
PyObject **items;
size_t new_allocated, num_allocated_bytes;
Py_ssize_t allocated = self->allocated;
/* Bypass realloc() when a previous overallocation is large enough
to accommodate the newsize. If the newsize falls lower than half
the allocated size, then proceed with the realloc() to shrink the list.
*/
if (allocated >= newsize && newsize >= (allocated >> 1)) {
assert(self->ob_item != NULL || newsize == 0);
Py_SET_SIZE(self, newsize);
return 0;
}
/* This over-allocates proportional to the list size, making room
* for additional growth. The over-allocation is mild, but is
* enough to give linear-time amortized behavior over a long
* sequence of appends() in the presence of a poorly-performing
* system realloc().
* Add padding to make the allocated size multiple of 4.
* The growth pattern is: 0, 4, 8, 16, 24, 32, 40, 52, 64, 76, ...
* Note: new_allocated won't overflow because the largest possible value
* is PY_SSIZE_T_MAX * (9 / 8) + 6 which always fits in a size_t.
*/
new_allocated = ((size_t)newsize + (newsize >> 3) + 6) & ~(size_t)3;
/* Do not overallocate if the new size is closer to overallocated size
* than to the old size.
*/
if (newsize - Py_SIZE(self) > (Py_ssize_t)(new_allocated - newsize))
new_allocated = ((size_t)newsize + 3) & ~(size_t)3;
if (newsize == 0)
new_allocated = 0;
if (new_allocated <= (size_t)PY_SSIZE_T_MAX / sizeof(PyObject *)) {
num_allocated_bytes = new_allocated * sizeof(PyObject *);
items = (PyObject **)PyMem_Realloc(self->ob_item, num_allocated_bytes);
}
else {
// integer overflow
items = NULL;
}
if (items == NULL) {
PyErr_NoMemory();
return -1;
}
self->ob_item = items;
Py_SET_SIZE(self, newsize);
self->allocated = new_allocated;
return 0;
}
static int
list_preallocate_exact(PyListObject *self, Py_ssize_t size)
{
assert(self->ob_item == NULL);
assert(size > 0);
/* Since the Python memory allocator has granularity of 16 bytes on 64-bit
* platforms (8 on 32-bit), there is no benefit of allocating space for
* the odd number of items, and there is no drawback of rounding the
* allocated size up to the nearest even number.
*/
size = (size + 1) & ~(size_t)1;
PyObject **items = PyMem_New(PyObject*, size);
if (items == NULL) {
PyErr_NoMemory();
return -1;
}
self->ob_item = items;
self->allocated = size;
return 0;
}
void
_PyList_ClearFreeList(PyInterpreterState *interp)
{
#if PyList_MAXFREELIST > 0
struct _Py_list_state *state = &interp->list;
while (state->numfree) {
PyListObject *op = state->free_list[--state->numfree];
assert(PyList_CheckExact(op));
PyObject_GC_Del(op);
}
#endif
}
void
_PyList_Fini(PyInterpreterState *interp)
{
_PyList_ClearFreeList(interp);
#if defined(Py_DEBUG) && PyList_MAXFREELIST > 0
struct _Py_list_state *state = &interp->list;
state->numfree = -1;
#endif
}
/* Print summary info about the state of the optimized allocator */
void
_PyList_DebugMallocStats(FILE *out)
{
#if PyList_MAXFREELIST > 0
struct _Py_list_state *state = get_list_state();
_PyDebugAllocatorStats(out,
"free PyListObject",
state->numfree, sizeof(PyListObject));
#endif
}
PyObject *
PyList_New(Py_ssize_t size)
{
PyListObject *op;
if (size < 0) {
PyErr_BadInternalCall();
return NULL;
}
#if PyList_MAXFREELIST > 0
struct _Py_list_state *state = get_list_state();
#ifdef Py_DEBUG
// PyList_New() must not be called after _PyList_Fini()
assert(state->numfree != -1);
#endif
if (PyList_MAXFREELIST && state->numfree) {
state->numfree--;
op = state->free_list[state->numfree];
OBJECT_STAT_INC(from_freelist);
_Py_NewReference((PyObject *)op);
}
else
#endif
{
op = PyObject_GC_New(PyListObject, &PyList_Type);
if (op == NULL) {
return NULL;
}
}
if (size <= 0) {
op->ob_item = NULL;
}
else {
op->ob_item = (PyObject **) PyMem_Calloc(size, sizeof(PyObject *));
if (op->ob_item == NULL) {
Py_DECREF(op);
return PyErr_NoMemory();
}
}
Py_SET_SIZE(op, size);
op->allocated = size;
_PyObject_GC_TRACK(op);
return (PyObject *) op;
}
static PyObject *
list_new_prealloc(Py_ssize_t size)
{
assert(size > 0);
PyListObject *op = (PyListObject *) PyList_New(0);
if (op == NULL) {
return NULL;
}
assert(op->ob_item == NULL);
op->ob_item = PyMem_New(PyObject *, size);
if (op->ob_item == NULL) {
Py_DECREF(op);
return PyErr_NoMemory();
}
op->allocated = size;
return (PyObject *) op;
}
Py_ssize_t
PyList_Size(PyObject *op)
{
if (!PyList_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
else
return Py_SIZE(op);
}
static inline int
valid_index(Py_ssize_t i, Py_ssize_t limit)
{
/* The cast to size_t lets us use just a single comparison
to check whether i is in the range: 0 <= i < limit.
See: Section 14.2 "Bounds Checking" in the Agner Fog
optimization manual found at:
https://www.agner.org/optimize/optimizing_cpp.pdf
*/
return (size_t) i < (size_t) limit;
}
PyObject *
PyList_GetItem(PyObject *op, Py_ssize_t i)
{
if (!PyList_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
if (!valid_index(i, Py_SIZE(op))) {
_Py_DECLARE_STR(list_err, "list index out of range");
PyErr_SetObject(PyExc_IndexError, &_Py_STR(list_err));
return NULL;
}
return ((PyListObject *)op) -> ob_item[i];
}
int
PyList_SetItem(PyObject *op, Py_ssize_t i,
PyObject *newitem)
{
PyObject **p;
if (!PyList_Check(op)) {
Py_XDECREF(newitem);
PyErr_BadInternalCall();
return -1;
}
if (!valid_index(i, Py_SIZE(op))) {
Py_XDECREF(newitem);
PyErr_SetString(PyExc_IndexError,
"list assignment index out of range");
return -1;
}
p = ((PyListObject *)op) -> ob_item + i;
Py_XSETREF(*p, newitem);
return 0;
}
static int
ins1(PyListObject *self, Py_ssize_t where, PyObject *v)
{
Py_ssize_t i, n = Py_SIZE(self);
PyObject **items;
if (v == NULL) {
PyErr_BadInternalCall();
return -1;
}
assert((size_t)n + 1 < PY_SSIZE_T_MAX);
if (list_resize(self, n+1) < 0)
return -1;
if (where < 0) {
where += n;
if (where < 0)
where = 0;
}
if (where > n)
where = n;
items = self->ob_item;
for (i = n; --i >= where; )
items[i+1] = items[i];
Py_INCREF(v);
items[where] = v;
return 0;
}
int
PyList_Insert(PyObject *op, Py_ssize_t where, PyObject *newitem)
{
if (!PyList_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
return ins1((PyListObject *)op, where, newitem);
}
/* internal, used by _PyList_AppendTakeRef */
int
_PyList_AppendTakeRefListResize(PyListObject *self, PyObject *newitem)
{
Py_ssize_t len = PyList_GET_SIZE(self);
assert(self->allocated == -1 || self->allocated == len);
if (list_resize(self, len + 1) < 0) {
Py_DECREF(newitem);
return -1;
}
PyList_SET_ITEM(self, len, newitem);
return 0;
}
int
PyList_Append(PyObject *op, PyObject *newitem)
{
if (PyList_Check(op) && (newitem != NULL)) {
Py_INCREF(newitem);
return _PyList_AppendTakeRef((PyListObject *)op, newitem);
}
PyErr_BadInternalCall();
return -1;
}
/* Methods */
static void
list_dealloc(PyListObject *op)
{
Py_ssize_t i;
PyObject_GC_UnTrack(op);
Py_TRASHCAN_BEGIN(op, list_dealloc)
if (op->ob_item != NULL) {
/* Do it backwards, for Christian Tismer.
There's a simple test case where somehow this reduces
thrashing when a *very* large list is created and
immediately deleted. */
i = Py_SIZE(op);
while (--i >= 0) {
Py_XDECREF(op->ob_item[i]);
}
PyMem_Free(op->ob_item);
}
#if PyList_MAXFREELIST > 0
struct _Py_list_state *state = get_list_state();
#ifdef Py_DEBUG
// list_dealloc() must not be called after _PyList_Fini()
assert(state->numfree != -1);
#endif
if (state->numfree < PyList_MAXFREELIST && PyList_CheckExact(op)) {
state->free_list[state->numfree++] = op;
OBJECT_STAT_INC(to_freelist);
}
else
#endif
{
Py_TYPE(op)->tp_free((PyObject *)op);
}
Py_TRASHCAN_END
}
static PyObject *
list_repr(PyListObject *v)
{
Py_ssize_t i;
PyObject *s;
_PyUnicodeWriter writer;
if (Py_SIZE(v) == 0) {
return PyUnicode_FromString("[]");
}
i = Py_ReprEnter((PyObject*)v);
if (i != 0) {
return i > 0 ? PyUnicode_FromString("[...]") : NULL;
}
_PyUnicodeWriter_Init(&writer);
writer.overallocate = 1;
/* "[" + "1" + ", 2" * (len - 1) + "]" */
writer.min_length = 1 + 1 + (2 + 1) * (Py_SIZE(v) - 1) + 1;
if (_PyUnicodeWriter_WriteChar(&writer, '[') < 0)
goto error;
/* Do repr() on each element. Note that this may mutate the list,
so must refetch the list size on each iteration. */
for (i = 0; i < Py_SIZE(v); ++i) {
if (i > 0) {
if (_PyUnicodeWriter_WriteASCIIString(&writer, ", ", 2) < 0)
goto error;
}
s = PyObject_Repr(v->ob_item[i]);
if (s == NULL)
goto error;
if (_PyUnicodeWriter_WriteStr(&writer, s) < 0) {
Py_DECREF(s);
goto error;
}
Py_DECREF(s);
}
writer.overallocate = 0;
if (_PyUnicodeWriter_WriteChar(&writer, ']') < 0)
goto error;
Py_ReprLeave((PyObject *)v);
return _PyUnicodeWriter_Finish(&writer);
error:
_PyUnicodeWriter_Dealloc(&writer);
Py_ReprLeave((PyObject *)v);
return NULL;
}
static Py_ssize_t
list_length(PyListObject *a)
{
return Py_SIZE(a);
}
static int
list_contains(PyListObject *a, PyObject *el)
{
PyObject *item;
Py_ssize_t i;
int cmp;
for (i = 0, cmp = 0 ; cmp == 0 && i < Py_SIZE(a); ++i) {
item = PyList_GET_ITEM(a, i);
Py_INCREF(item);
cmp = PyObject_RichCompareBool(item, el, Py_EQ);
Py_DECREF(item);
}
return cmp;
}
static PyObject *
list_item(PyListObject *a, Py_ssize_t i)
{
if (!valid_index(i, Py_SIZE(a))) {
PyErr_SetObject(PyExc_IndexError, &_Py_STR(list_err));
return NULL;
}
Py_INCREF(a->ob_item[i]);
return a->ob_item[i];
}
static PyObject *
list_slice(PyListObject *a, Py_ssize_t ilow, Py_ssize_t ihigh)
{
PyListObject *np;
PyObject **src, **dest;
Py_ssize_t i, len;
len = ihigh - ilow;
if (len <= 0) {
return PyList_New(0);
}
np = (PyListObject *) list_new_prealloc(len);
if (np == NULL)
return NULL;
src = a->ob_item + ilow;
dest = np->ob_item;
for (i = 0; i < len; i++) {
PyObject *v = src[i];
Py_INCREF(v);
dest[i] = v;
}
Py_SET_SIZE(np, len);
return (PyObject *)np;
}
PyObject *
PyList_GetSlice(PyObject *a, Py_ssize_t ilow, Py_ssize_t ihigh)
{
if (!PyList_Check(a)) {
PyErr_BadInternalCall();
return NULL;
}
if (ilow < 0) {
ilow = 0;
}
else if (ilow > Py_SIZE(a)) {
ilow = Py_SIZE(a);
}
if (ihigh < ilow) {
ihigh = ilow;
}
else if (ihigh > Py_SIZE(a)) {
ihigh = Py_SIZE(a);
}
return list_slice((PyListObject *)a, ilow, ihigh);
}
static PyObject *
list_concat(PyListObject *a, PyObject *bb)
{
Py_ssize_t size;
Py_ssize_t i;
PyObject **src, **dest;
PyListObject *np;
if (!PyList_Check(bb)) {
PyErr_Format(PyExc_TypeError,
"can only concatenate list (not \"%.200s\") to list",
Py_TYPE(bb)->tp_name);
return NULL;
}
#define b ((PyListObject *)bb)
assert((size_t)Py_SIZE(a) + (size_t)Py_SIZE(b) < PY_SSIZE_T_MAX);
size = Py_SIZE(a) + Py_SIZE(b);
if (size == 0) {
return PyList_New(0);
}
np = (PyListObject *) list_new_prealloc(size);
if (np == NULL) {
return NULL;
}
src = a->ob_item;
dest = np->ob_item;
for (i = 0; i < Py_SIZE(a); i++) {
PyObject *v = src[i];
Py_INCREF(v);
dest[i] = v;
}
src = b->ob_item;
dest = np->ob_item + Py_SIZE(a);
for (i = 0; i < Py_SIZE(b); i++) {
PyObject *v = src[i];
Py_INCREF(v);
dest[i] = v;
}
Py_SET_SIZE(np, size);
return (PyObject *)np;
#undef b
}
static PyObject *
list_repeat(PyListObject *a, Py_ssize_t n)
{
Py_ssize_t size;
PyListObject *np;
if (n < 0)
n = 0;
if (n > 0 && Py_SIZE(a) > PY_SSIZE_T_MAX / n)
return PyErr_NoMemory();
size = Py_SIZE(a) * n;
if (size == 0)
return PyList_New(0);
np = (PyListObject *) list_new_prealloc(size);
if (np == NULL)
return NULL;
PyObject **dest = np->ob_item;
PyObject **dest_end = dest + size;
if (Py_SIZE(a) == 1) {
PyObject *elem = a->ob_item[0];
Py_SET_REFCNT(elem, Py_REFCNT(elem) + n);
#ifdef Py_REF_DEBUG
_Py_RefTotal += n;
#endif
while (dest < dest_end) {
*dest++ = elem;
}
}
else {
PyObject **src = a->ob_item;
PyObject **src_end = src + Py_SIZE(a);
while (src < src_end) {
Py_SET_REFCNT(*src, Py_REFCNT(*src) + n);
#ifdef Py_REF_DEBUG
_Py_RefTotal += n;
#endif
*dest++ = *src++;
}
// Now src chases after dest in the same buffer
src = np->ob_item;
while (dest < dest_end) {
*dest++ = *src++;
}
}
Py_SET_SIZE(np, size);
return (PyObject *) np;
}
static int
_list_clear(PyListObject *a)
{
Py_ssize_t i;
PyObject **item = a->ob_item;
if (item != NULL) {
/* Because XDECREF can recursively invoke operations on
this list, we make it empty first. */
i = Py_SIZE(a);
Py_SET_SIZE(a, 0);
a->ob_item = NULL;
a->allocated = 0;
while (--i >= 0) {
Py_XDECREF(item[i]);
}
PyMem_Free(item);
}
/* Never fails; the return value can be ignored.
Note that there is no guarantee that the list is actually empty
at this point, because XDECREF may have populated it again! */
return 0;
}
/* a[ilow:ihigh] = v if v != NULL.
* del a[ilow:ihigh] if v == NULL.
*
* Special speed gimmick: when v is NULL and ihigh - ilow <= 8, it's
* guaranteed the call cannot fail.
*/
static int
list_ass_slice(PyListObject *a, Py_ssize_t ilow, Py_ssize_t ihigh, PyObject *v)
{
/* Because [X]DECREF can recursively invoke list operations on
this list, we must postpone all [X]DECREF activity until
after the list is back in its canonical shape. Therefore
we must allocate an additional array, 'recycle', into which
we temporarily copy the items that are deleted from the
list. :-( */
PyObject *recycle_on_stack[8];
PyObject **recycle = recycle_on_stack; /* will allocate more if needed */
PyObject **item;
PyObject **vitem = NULL;
PyObject *v_as_SF = NULL; /* PySequence_Fast(v) */
Py_ssize_t n; /* # of elements in replacement list */
Py_ssize_t norig; /* # of elements in list getting replaced */
Py_ssize_t d; /* Change in size */
Py_ssize_t k;
size_t s;
int result = -1; /* guilty until proved innocent */
#define b ((PyListObject *)v)
if (v == NULL)
n = 0;
else {
if (a == b) {
/* Special case "a[i:j] = a" -- copy b first */
v = list_slice(b, 0, Py_SIZE(b));
if (v == NULL)
return result;
result = list_ass_slice(a, ilow, ihigh, v);
Py_DECREF(v);
return result;
}
v_as_SF = PySequence_Fast(v, "can only assign an iterable");
if(v_as_SF == NULL)
goto Error;
n = PySequence_Fast_GET_SIZE(v_as_SF);
vitem = PySequence_Fast_ITEMS(v_as_SF);
}
if (ilow < 0)
ilow = 0;
else if (ilow > Py_SIZE(a))
ilow = Py_SIZE(a);
if (ihigh < ilow)
ihigh = ilow;
else if (ihigh > Py_SIZE(a))
ihigh = Py_SIZE(a);
norig = ihigh - ilow;
assert(norig >= 0);
d = n - norig;
if (Py_SIZE(a) + d == 0) {
Py_XDECREF(v_as_SF);
return _list_clear(a);
}
item = a->ob_item;
/* recycle the items that we are about to remove */
s = norig * sizeof(PyObject *);
/* If norig == 0, item might be NULL, in which case we may not memcpy from it. */
if (s) {
if (s > sizeof(recycle_on_stack)) {
recycle = (PyObject **)PyMem_Malloc(s);
if (recycle == NULL) {
PyErr_NoMemory();
goto Error;
}
}
memcpy(recycle, &item[ilow], s);
}
if (d < 0) { /* Delete -d items */
Py_ssize_t tail;
tail = (Py_SIZE(a) - ihigh) * sizeof(PyObject *);
memmove(&item[ihigh+d], &item[ihigh], tail);
if (list_resize(a, Py_SIZE(a) + d) < 0) {
memmove(&item[ihigh], &item[ihigh+d], tail);
memcpy(&item[ilow], recycle, s);
goto Error;
}
item = a->ob_item;
}
else if (d > 0) { /* Insert d items */
k = Py_SIZE(a);
if (list_resize(a, k+d) < 0)
goto Error;
item = a->ob_item;
memmove(&item[ihigh+d], &item[ihigh],
(k - ihigh)*sizeof(PyObject *));
}
for (k = 0; k < n; k++, ilow++) {
PyObject *w = vitem[k];
Py_XINCREF(w);
item[ilow] = w;
}
for (k = norig - 1; k >= 0; --k)
Py_XDECREF(recycle[k]);
result = 0;
Error:
if (recycle != recycle_on_stack)
PyMem_Free(recycle);
Py_XDECREF(v_as_SF);
return result;
#undef b
}
int
PyList_SetSlice(PyObject *a, Py_ssize_t ilow, Py_ssize_t ihigh, PyObject *v)
{
if (!PyList_Check(a)) {
PyErr_BadInternalCall();
return -1;
}
return list_ass_slice((PyListObject *)a, ilow, ihigh, v);
}
static PyObject *
list_inplace_repeat(PyListObject *self, Py_ssize_t n)
{
PyObject **items;
Py_ssize_t size, i, j, p;
size = PyList_GET_SIZE(self);
if (size == 0 || n == 1) {
Py_INCREF(self);
return (PyObject *)self;
}
if (n < 1) {
(void)_list_clear(self);
Py_INCREF(self);
return (PyObject *)self;
}
if (size > PY_SSIZE_T_MAX / n) {
return PyErr_NoMemory();
}
if (list_resize(self, size*n) < 0)
return NULL;
p = size;
items = self->ob_item;
for (i = 1; i < n; i++) { /* Start counting at 1, not 0 */
for (j = 0; j < size; j++) {
PyObject *o = items[j];
Py_INCREF(o);
items[p++] = o;
}
}
Py_INCREF(self);
return (PyObject *)self;
}
static int
list_ass_item(PyListObject *a, Py_ssize_t i, PyObject *v)
{
if (!valid_index(i, Py_SIZE(a))) {
PyErr_SetString(PyExc_IndexError,
"list assignment index out of range");
return -1;
}
if (v == NULL)
return list_ass_slice(a, i, i+1, v);
Py_INCREF(v);
Py_SETREF(a->ob_item[i], v);
return 0;
}
/*[clinic input]
list.insert
index: Py_ssize_t
object: object
/
Insert object before index.
[clinic start generated code]*/
static PyObject *
list_insert_impl(PyListObject *self, Py_ssize_t index, PyObject *object)
/*[clinic end generated code: output=7f35e32f60c8cb78 input=858514cf894c7eab]*/
{
if (ins1(self, index, object) == 0)
Py_RETURN_NONE;
return NULL;
}
/*[clinic input]
list.clear
Remove all items from list.
[clinic start generated code]*/
static PyObject *
list_clear_impl(PyListObject *self)
/*[clinic end generated code: output=67a1896c01f74362 input=ca3c1646856742f6]*/
{
_list_clear(self);
Py_RETURN_NONE;
}
/*[clinic input]
list.copy
Return a shallow copy of the list.
[clinic start generated code]*/
static PyObject *
list_copy_impl(PyListObject *self)
/*[clinic end generated code: output=ec6b72d6209d418e input=6453ab159e84771f]*/
{
return list_slice(self, 0, Py_SIZE(self));
}
/*[clinic input]
list.append
object: object
/
Append object to the end of the list.
[clinic start generated code]*/
static PyObject *
list_append(PyListObject *self, PyObject *object)
/*[clinic end generated code: output=7c096003a29c0eae input=43a3fe48a7066e91]*/
{
if (_PyList_AppendTakeRef(self, Py_NewRef(object)) < 0) {
return NULL;
}
Py_RETURN_NONE;
}
/*[clinic input]
list.extend
iterable: object
/
Extend list by appending elements from the iterable.
[clinic start generated code]*/
static PyObject *
list_extend(PyListObject *self, PyObject *iterable)
/*[clinic end generated code: output=630fb3bca0c8e789 input=9ec5ba3a81be3a4d]*/
{
PyObject *it; /* iter(v) */
Py_ssize_t m; /* size of self */
Py_ssize_t n; /* guess for size of iterable */
Py_ssize_t i;
PyObject *(*iternext)(PyObject *);
/* Special cases:
1) lists and tuples which can use PySequence_Fast ops
2) extending self to self requires making a copy first
*/
if (PyList_CheckExact(iterable) || PyTuple_CheckExact(iterable) ||
(PyObject *)self == iterable) {
PyObject **src, **dest;
iterable = PySequence_Fast(iterable, "argument must be iterable");
if (!iterable)
return NULL;
n = PySequence_Fast_GET_SIZE(iterable);
if (n == 0) {
/* short circuit when iterable is empty */
Py_DECREF(iterable);
Py_RETURN_NONE;
}
m = Py_SIZE(self);
/* It should not be possible to allocate a list large enough to cause
an overflow on any relevant platform */
assert(m < PY_SSIZE_T_MAX - n);
if (self->ob_item == NULL) {
if (list_preallocate_exact(self, n) < 0) {
return NULL;
}
Py_SET_SIZE(self, n);
}
else if (list_resize(self, m + n) < 0) {
Py_DECREF(iterable);
return NULL;
}
/* note that we may still have self == iterable here for the
* situation a.extend(a), but the following code works
* in that case too. Just make sure to resize self
* before calling PySequence_Fast_ITEMS.
*/
/* populate the end of self with iterable's items */
src = PySequence_Fast_ITEMS(iterable);
dest = self->ob_item + m;
for (i = 0; i < n; i++) {
PyObject *o = src[i];
Py_INCREF(o);
dest[i] = o;
}
Py_DECREF(iterable);
Py_RETURN_NONE;
}
it = PyObject_GetIter(iterable);
if (it == NULL)
return NULL;
iternext = *Py_TYPE(it)->tp_iternext;
/* Guess a result list size. */
n = PyObject_LengthHint(iterable, 8);
if (n < 0) {
Py_DECREF(it);
return NULL;
}
m = Py_SIZE(self);
if (m > PY_SSIZE_T_MAX - n) {
/* m + n overflowed; on the chance that n lied, and there really
* is enough room, ignore it. If n was telling the truth, we'll
* eventually run out of memory during the loop.
*/
}
else if (self->ob_item == NULL) {
if (n && list_preallocate_exact(self, n) < 0)
goto error;
}
else {
/* Make room. */
if (list_resize(self, m + n) < 0)
goto error;
/* Make the list sane again. */
Py_SET_SIZE(self, m);
}
/* Run iterator to exhaustion. */
for (;;) {
PyObject *item = iternext(it);
if (item == NULL) {
if (PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_StopIteration))
PyErr_Clear();
else
goto error;
}
break;
}
if (Py_SIZE(self) < self->allocated) {
/* steals ref */
PyList_SET_ITEM(self, Py_SIZE(self), item);
Py_SET_SIZE(self, Py_SIZE(self) + 1);
}
else {
if (_PyList_AppendTakeRef(self, item) < 0)
goto error;
}
}
/* Cut back result list if initial guess was too large. */
if (Py_SIZE(self) < self->allocated) {
if (list_resize(self, Py_SIZE(self)) < 0)
goto error;
}
Py_DECREF(it);
Py_RETURN_NONE;
error:
Py_DECREF(it);
return NULL;
}