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3012 lines (2662 loc) · 80.2 KB
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/* Abstract Object Interface (many thanks to Jim Fulton) */
#include "Python.h"
#include "pycore_abstract.h" // _PyIndex_Check()
#include "pycore_pybuffer.h"
#include "pycore_call.h" // _PyObject_CallNoArgs()
#include "pycore_ceval.h" // _Py_EnterRecursiveCallTstate()
#include "pycore_crossinterp.h" // _Py_CallInInterpreter()
#include "pycore_object.h" // _Py_CheckSlotResult()
#include "pycore_long.h" // _Py_IsNegative
#include "pycore_pyerrors.h" // _PyErr_Occurred()
#include "pycore_pystate.h" // _PyThreadState_GET()
#include "pycore_unionobject.h" // _PyUnion_Check()
#include <stddef.h> // offsetof()
/* Shorthands to return certain errors */
static PyObject *
type_error(const char *msg, PyObject *obj)
{
PyErr_Format(PyExc_TypeError, msg, Py_TYPE(obj)->tp_name);
return NULL;
}
static PyObject *
null_error(void)
{
PyThreadState *tstate = _PyThreadState_GET();
if (!_PyErr_Occurred(tstate)) {
_PyErr_SetString(tstate, PyExc_SystemError,
"null argument to internal routine");
}
return NULL;
}
/* Operations on any object */
PyObject *
PyObject_Type(PyObject *o)
{
PyObject *v;
if (o == NULL) {
return null_error();
}
v = (PyObject *)Py_TYPE(o);
return Py_NewRef(v);
}
Py_ssize_t
PyObject_Size(PyObject *o)
{
if (o == NULL) {
null_error();
return -1;
}
PySequenceMethods *m = Py_TYPE(o)->tp_as_sequence;
if (m && m->sq_length) {
Py_ssize_t len = m->sq_length(o);
assert(_Py_CheckSlotResult(o, "__len__", len >= 0));
return len;
}
return PyMapping_Size(o);
}
#undef PyObject_Length
Py_ssize_t
PyObject_Length(PyObject *o)
{
return PyObject_Size(o);
}
#define PyObject_Length PyObject_Size
int
_PyObject_HasLen(PyObject *o) {
return (Py_TYPE(o)->tp_as_sequence && Py_TYPE(o)->tp_as_sequence->sq_length) ||
(Py_TYPE(o)->tp_as_mapping && Py_TYPE(o)->tp_as_mapping->mp_length);
}
/* The length hint function returns a non-negative value from o.__len__()
or o.__length_hint__(). If those methods aren't found the defaultvalue is
returned. If one of the calls fails with an exception other than TypeError
this function returns -1.
*/
Py_ssize_t
PyObject_LengthHint(PyObject *o, Py_ssize_t defaultvalue)
{
PyObject *hint, *result;
Py_ssize_t res;
if (_PyObject_HasLen(o)) {
res = PyObject_Length(o);
if (res < 0) {
PyThreadState *tstate = _PyThreadState_GET();
assert(_PyErr_Occurred(tstate));
if (!_PyErr_ExceptionMatches(tstate, PyExc_TypeError)) {
return -1;
}
_PyErr_Clear(tstate);
}
else {
return res;
}
}
hint = _PyObject_LookupSpecial(o, &_Py_ID(__length_hint__));
if (hint == NULL) {
if (PyErr_Occurred()) {
return -1;
}
return defaultvalue;
}
result = _PyObject_CallNoArgs(hint);
Py_DECREF(hint);
if (result == NULL) {
PyThreadState *tstate = _PyThreadState_GET();
if (_PyErr_ExceptionMatches(tstate, PyExc_TypeError)) {
_PyErr_Clear(tstate);
return defaultvalue;
}
return -1;
}
else if (result == Py_NotImplemented) {
Py_DECREF(result);
return defaultvalue;
}
if (!PyLong_Check(result)) {
PyErr_Format(PyExc_TypeError, "__length_hint__ must be an integer, not %.100s",
Py_TYPE(result)->tp_name);
Py_DECREF(result);
return -1;
}
res = PyLong_AsSsize_t(result);
Py_DECREF(result);
if (res < 0 && PyErr_Occurred()) {
return -1;
}
if (res < 0) {
PyErr_Format(PyExc_ValueError, "__length_hint__() should return >= 0");
return -1;
}
return res;
}
PyObject *
PyObject_GetItem(PyObject *o, PyObject *key)
{
if (o == NULL || key == NULL) {
return null_error();
}
PyMappingMethods *m = Py_TYPE(o)->tp_as_mapping;
if (m && m->mp_subscript) {
PyObject *item = m->mp_subscript(o, key);
assert(_Py_CheckSlotResult(o, "__getitem__", item != NULL));
return item;
}
PySequenceMethods *ms = Py_TYPE(o)->tp_as_sequence;
if (ms && ms->sq_item) {
if (_PyIndex_Check(key)) {
Py_ssize_t key_value;
key_value = PyNumber_AsSsize_t(key, PyExc_IndexError);
if (key_value == -1 && PyErr_Occurred())
return NULL;
return PySequence_GetItem(o, key_value);
}
else {
return type_error("sequence index must "
"be integer, not '%.200s'", key);
}
}
if (PyType_Check(o)) {
PyObject *meth, *result;
// Special case type[int], but disallow other types so str[int] fails
if ((PyTypeObject*)o == &PyType_Type) {
return Py_GenericAlias(o, key);
}
if (PyObject_GetOptionalAttr(o, &_Py_ID(__class_getitem__), &meth) < 0) {
return NULL;
}
if (meth && meth != Py_None) {
result = PyObject_CallOneArg(meth, key);
Py_DECREF(meth);
return result;
}
Py_XDECREF(meth);
PyErr_Format(PyExc_TypeError, "type '%.200s' is not subscriptable",
((PyTypeObject *)o)->tp_name);
return NULL;
}
return type_error("'%.200s' object is not subscriptable", o);
}
int
PyMapping_GetOptionalItem(PyObject *obj, PyObject *key, PyObject **result)
{
if (PyDict_CheckExact(obj)) {
*result = PyDict_GetItemWithError(obj, key); /* borrowed */
if (*result) {
Py_INCREF(*result);
return 1;
}
return PyErr_Occurred() ? -1 : 0;
}
*result = PyObject_GetItem(obj, key);
if (*result) {
return 1;
}
assert(PyErr_Occurred());
if (!PyErr_ExceptionMatches(PyExc_KeyError)) {
return -1;
}
PyErr_Clear();
return 0;
}
int
PyObject_SetItem(PyObject *o, PyObject *key, PyObject *value)
{
if (o == NULL || key == NULL || value == NULL) {
null_error();
return -1;
}
PyMappingMethods *m = Py_TYPE(o)->tp_as_mapping;
if (m && m->mp_ass_subscript) {
int res = m->mp_ass_subscript(o, key, value);
assert(_Py_CheckSlotResult(o, "__setitem__", res >= 0));
return res;
}
if (Py_TYPE(o)->tp_as_sequence) {
if (_PyIndex_Check(key)) {
Py_ssize_t key_value;
key_value = PyNumber_AsSsize_t(key, PyExc_IndexError);
if (key_value == -1 && PyErr_Occurred())
return -1;
return PySequence_SetItem(o, key_value, value);
}
else if (Py_TYPE(o)->tp_as_sequence->sq_ass_item) {
type_error("sequence index must be "
"integer, not '%.200s'", key);
return -1;
}
}
type_error("'%.200s' object does not support item assignment", o);
return -1;
}
int
PyObject_DelItem(PyObject *o, PyObject *key)
{
if (o == NULL || key == NULL) {
null_error();
return -1;
}
PyMappingMethods *m = Py_TYPE(o)->tp_as_mapping;
if (m && m->mp_ass_subscript) {
int res = m->mp_ass_subscript(o, key, (PyObject*)NULL);
assert(_Py_CheckSlotResult(o, "__delitem__", res >= 0));
return res;
}
if (Py_TYPE(o)->tp_as_sequence) {
if (_PyIndex_Check(key)) {
Py_ssize_t key_value;
key_value = PyNumber_AsSsize_t(key, PyExc_IndexError);
if (key_value == -1 && PyErr_Occurred())
return -1;
return PySequence_DelItem(o, key_value);
}
else if (Py_TYPE(o)->tp_as_sequence->sq_ass_item) {
type_error("sequence index must be "
"integer, not '%.200s'", key);
return -1;
}
}
type_error("'%.200s' object does not support item deletion", o);
return -1;
}
int
PyObject_DelItemString(PyObject *o, const char *key)
{
PyObject *okey;
int ret;
if (o == NULL || key == NULL) {
null_error();
return -1;
}
okey = PyUnicode_FromString(key);
if (okey == NULL)
return -1;
ret = PyObject_DelItem(o, okey);
Py_DECREF(okey);
return ret;
}
/* Return 1 if the getbuffer function is available, otherwise return 0. */
int
PyObject_CheckBuffer(PyObject *obj)
{
PyBufferProcs *tp_as_buffer = Py_TYPE(obj)->tp_as_buffer;
return (tp_as_buffer != NULL && tp_as_buffer->bf_getbuffer != NULL);
}
// Old buffer protocols (deprecated, abi only)
/* Checks whether an arbitrary object supports the (character, single segment)
buffer interface.
Returns 1 on success, 0 on failure.
We release the buffer right after use of this function which could
cause issues later on. Don't use these functions in new code.
*/
PyAPI_FUNC(int) /* abi_only */
PyObject_CheckReadBuffer(PyObject *obj)
{
PyBufferProcs *pb = Py_TYPE(obj)->tp_as_buffer;
Py_buffer view;
if (pb == NULL ||
pb->bf_getbuffer == NULL)
return 0;
if ((*pb->bf_getbuffer)(obj, &view, PyBUF_SIMPLE) == -1) {
PyErr_Clear();
return 0;
}
PyBuffer_Release(&view);
return 1;
}
static int
as_read_buffer(PyObject *obj, const void **buffer, Py_ssize_t *buffer_len)
{
Py_buffer view;
if (obj == NULL || buffer == NULL || buffer_len == NULL) {
null_error();
return -1;
}
if (PyObject_GetBuffer(obj, &view, PyBUF_SIMPLE) != 0)
return -1;
*buffer = view.buf;
*buffer_len = view.len;
PyBuffer_Release(&view);
return 0;
}
/* Takes an arbitrary object which must support the (character, single segment)
buffer interface and returns a pointer to a read-only memory location
usable as character based input for subsequent processing.
Return 0 on success. buffer and buffer_len are only set in case no error
occurs. Otherwise, -1 is returned and an exception set. */
PyAPI_FUNC(int) /* abi_only */
PyObject_AsCharBuffer(PyObject *obj,
const char **buffer,
Py_ssize_t *buffer_len)
{
return as_read_buffer(obj, (const void **)buffer, buffer_len);
}
/* Same as PyObject_AsCharBuffer() except that this API expects (readable,
single segment) buffer interface and returns a pointer to a read-only memory
location which can contain arbitrary data.
0 is returned on success. buffer and buffer_len are only set in case no
error occurs. Otherwise, -1 is returned and an exception set. */
PyAPI_FUNC(int) /* abi_only */
PyObject_AsReadBuffer(PyObject *obj,
const void **buffer,
Py_ssize_t *buffer_len)
{
return as_read_buffer(obj, buffer, buffer_len);
}
/* Takes an arbitrary object which must support the (writable, single segment)
buffer interface and returns a pointer to a writable memory location in
buffer of size 'buffer_len'.
Return 0 on success. buffer and buffer_len are only set in case no error
occurs. Otherwise, -1 is returned and an exception set. */
PyAPI_FUNC(int) /* abi_only */
PyObject_AsWriteBuffer(PyObject *obj,
void **buffer,
Py_ssize_t *buffer_len)
{
PyBufferProcs *pb;
Py_buffer view;
if (obj == NULL || buffer == NULL || buffer_len == NULL) {
null_error();
return -1;
}
pb = Py_TYPE(obj)->tp_as_buffer;
if (pb == NULL ||
pb->bf_getbuffer == NULL ||
((*pb->bf_getbuffer)(obj, &view, PyBUF_WRITABLE) != 0)) {
PyErr_SetString(PyExc_TypeError,
"expected a writable bytes-like object");
return -1;
}
*buffer = view.buf;
*buffer_len = view.len;
PyBuffer_Release(&view);
return 0;
}
/* Buffer C-API for Python 3.0 */
int
PyObject_GetBuffer(PyObject *obj, Py_buffer *view, int flags)
{
PyBufferProcs *pb = Py_TYPE(obj)->tp_as_buffer;
if (pb == NULL || pb->bf_getbuffer == NULL) {
PyErr_Format(PyExc_TypeError,
"a bytes-like object is required, not '%.100s'",
Py_TYPE(obj)->tp_name);
return -1;
}
int res = (*pb->bf_getbuffer)(obj, view, flags);
assert(_Py_CheckSlotResult(obj, "getbuffer", res >= 0));
return res;
}
static int
_IsFortranContiguous(const Py_buffer *view)
{
Py_ssize_t sd, dim;
int i;
/* 1) len = product(shape) * itemsize
2) itemsize > 0
3) len = 0 <==> exists i: shape[i] = 0 */
if (view->len == 0) return 1;
if (view->strides == NULL) { /* C-contiguous by definition */
/* Trivially F-contiguous */
if (view->ndim <= 1) return 1;
/* ndim > 1 implies shape != NULL */
assert(view->shape != NULL);
/* Effectively 1-d */
sd = 0;
for (i=0; i<view->ndim; i++) {
if (view->shape[i] > 1) sd += 1;
}
return sd <= 1;
}
/* strides != NULL implies both of these */
assert(view->ndim > 0);
assert(view->shape != NULL);
sd = view->itemsize;
for (i=0; i<view->ndim; i++) {
dim = view->shape[i];
if (dim > 1 && view->strides[i] != sd) {
return 0;
}
sd *= dim;
}
return 1;
}
static int
_IsCContiguous(const Py_buffer *view)
{
Py_ssize_t sd, dim;
int i;
/* 1) len = product(shape) * itemsize
2) itemsize > 0
3) len = 0 <==> exists i: shape[i] = 0 */
if (view->len == 0) return 1;
if (view->strides == NULL) return 1; /* C-contiguous by definition */
/* strides != NULL implies both of these */
assert(view->ndim > 0);
assert(view->shape != NULL);
sd = view->itemsize;
for (i=view->ndim-1; i>=0; i--) {
dim = view->shape[i];
if (dim > 1 && view->strides[i] != sd) {
return 0;
}
sd *= dim;
}
return 1;
}
int
PyBuffer_IsContiguous(const Py_buffer *view, char order)
{
if (view->suboffsets != NULL) return 0;
if (order == 'C')
return _IsCContiguous(view);
else if (order == 'F')
return _IsFortranContiguous(view);
else if (order == 'A')
return (_IsCContiguous(view) || _IsFortranContiguous(view));
return 0;
}
void*
PyBuffer_GetPointer(const Py_buffer *view, const Py_ssize_t *indices)
{
char* pointer;
int i;
pointer = (char *)view->buf;
for (i = 0; i < view->ndim; i++) {
pointer += view->strides[i]*indices[i];
if ((view->suboffsets != NULL) && (view->suboffsets[i] >= 0)) {
pointer = *((char**)pointer) + view->suboffsets[i];
}
}
return (void*)pointer;
}
static void
_Py_add_one_to_index_F(int nd, Py_ssize_t *index, const Py_ssize_t *shape)
{
int k;
for (k=0; k<nd; k++) {
if (index[k] < shape[k]-1) {
index[k]++;
break;
}
else {
index[k] = 0;
}
}
}
static void
_Py_add_one_to_index_C(int nd, Py_ssize_t *index, const Py_ssize_t *shape)
{
int k;
for (k=nd-1; k>=0; k--) {
if (index[k] < shape[k]-1) {
index[k]++;
break;
}
else {
index[k] = 0;
}
}
}
Py_ssize_t
PyBuffer_SizeFromFormat(const char *format)
{
PyObject *calcsize = NULL;
PyObject *res = NULL;
PyObject *fmt = NULL;
Py_ssize_t itemsize = -1;
calcsize = _PyImport_GetModuleAttrString("struct", "calcsize");
if (calcsize == NULL) {
goto done;
}
fmt = PyUnicode_FromString(format);
if (fmt == NULL) {
goto done;
}
res = PyObject_CallFunctionObjArgs(calcsize, fmt, NULL);
if (res == NULL) {
goto done;
}
itemsize = PyLong_AsSsize_t(res);
if (itemsize < 0) {
goto done;
}
done:
Py_XDECREF(calcsize);
Py_XDECREF(fmt);
Py_XDECREF(res);
return itemsize;
}
int
PyBuffer_FromContiguous(const Py_buffer *view, const void *buf, Py_ssize_t len, char fort)
{
int k;
void (*addone)(int, Py_ssize_t *, const Py_ssize_t *);
Py_ssize_t *indices, elements;
char *ptr;
const char *src;
if (len > view->len) {
len = view->len;
}
if (PyBuffer_IsContiguous(view, fort)) {
/* simplest copy is all that is needed */
memcpy(view->buf, buf, len);
return 0;
}
/* Otherwise a more elaborate scheme is needed */
/* view->ndim <= 64 */
indices = (Py_ssize_t *)PyMem_Malloc(sizeof(Py_ssize_t)*(view->ndim));
if (indices == NULL) {
PyErr_NoMemory();
return -1;
}
for (k=0; k<view->ndim;k++) {
indices[k] = 0;
}
if (fort == 'F') {
addone = _Py_add_one_to_index_F;
}
else {
addone = _Py_add_one_to_index_C;
}
src = buf;
/* XXX : This is not going to be the fastest code in the world
several optimizations are possible.
*/
elements = len / view->itemsize;
while (elements--) {
ptr = PyBuffer_GetPointer(view, indices);
memcpy(ptr, src, view->itemsize);
src += view->itemsize;
addone(view->ndim, indices, view->shape);
}
PyMem_Free(indices);
return 0;
}
int PyObject_CopyData(PyObject *dest, PyObject *src)
{
Py_buffer view_dest, view_src;
int k;
Py_ssize_t *indices, elements;
char *dptr, *sptr;
if (!PyObject_CheckBuffer(dest) ||
!PyObject_CheckBuffer(src)) {
PyErr_SetString(PyExc_TypeError,
"both destination and source must be "\
"bytes-like objects");
return -1;
}
if (PyObject_GetBuffer(dest, &view_dest, PyBUF_FULL) != 0) return -1;
if (PyObject_GetBuffer(src, &view_src, PyBUF_FULL_RO) != 0) {
PyBuffer_Release(&view_dest);
return -1;
}
if (view_dest.len < view_src.len) {
PyErr_SetString(PyExc_BufferError,
"destination is too small to receive data from source");
PyBuffer_Release(&view_dest);
PyBuffer_Release(&view_src);
return -1;
}
if ((PyBuffer_IsContiguous(&view_dest, 'C') &&
PyBuffer_IsContiguous(&view_src, 'C')) ||
(PyBuffer_IsContiguous(&view_dest, 'F') &&
PyBuffer_IsContiguous(&view_src, 'F'))) {
/* simplest copy is all that is needed */
memcpy(view_dest.buf, view_src.buf, view_src.len);
PyBuffer_Release(&view_dest);
PyBuffer_Release(&view_src);
return 0;
}
/* Otherwise a more elaborate copy scheme is needed */
/* XXX(nnorwitz): need to check for overflow! */
indices = (Py_ssize_t *)PyMem_Malloc(sizeof(Py_ssize_t)*view_src.ndim);
if (indices == NULL) {
PyErr_NoMemory();
PyBuffer_Release(&view_dest);
PyBuffer_Release(&view_src);
return -1;
}
for (k=0; k<view_src.ndim;k++) {
indices[k] = 0;
}
elements = 1;
for (k=0; k<view_src.ndim; k++) {
/* XXX(nnorwitz): can this overflow? */
elements *= view_src.shape[k];
}
while (elements--) {
_Py_add_one_to_index_C(view_src.ndim, indices, view_src.shape);
dptr = PyBuffer_GetPointer(&view_dest, indices);
sptr = PyBuffer_GetPointer(&view_src, indices);
memcpy(dptr, sptr, view_src.itemsize);
}
PyMem_Free(indices);
PyBuffer_Release(&view_dest);
PyBuffer_Release(&view_src);
return 0;
}
void
PyBuffer_FillContiguousStrides(int nd, Py_ssize_t *shape,
Py_ssize_t *strides, int itemsize,
char fort)
{
int k;
Py_ssize_t sd;
sd = itemsize;
if (fort == 'F') {
for (k=0; k<nd; k++) {
strides[k] = sd;
sd *= shape[k];
}
}
else {
for (k=nd-1; k>=0; k--) {
strides[k] = sd;
sd *= shape[k];
}
}
return;
}
int
PyBuffer_FillInfo(Py_buffer *view, PyObject *obj, void *buf, Py_ssize_t len,
int readonly, int flags)
{
if (view == NULL) {
PyErr_SetString(PyExc_BufferError,
"PyBuffer_FillInfo: view==NULL argument is obsolete");
return -1;
}
if (((flags & PyBUF_WRITABLE) == PyBUF_WRITABLE) &&
(readonly == 1)) {
PyErr_SetString(PyExc_BufferError,
"Object is not writable.");
return -1;
}
view->obj = Py_XNewRef(obj);
view->buf = buf;
view->len = len;
view->readonly = readonly;
view->itemsize = 1;
view->format = NULL;
if ((flags & PyBUF_FORMAT) == PyBUF_FORMAT)
view->format = "B";
view->ndim = 1;
view->shape = NULL;
if ((flags & PyBUF_ND) == PyBUF_ND)
view->shape = &(view->len);
view->strides = NULL;
if ((flags & PyBUF_STRIDES) == PyBUF_STRIDES)
view->strides = &(view->itemsize);
view->suboffsets = NULL;
view->internal = NULL;
return 0;
}
void
PyBuffer_Release(Py_buffer *view)
{
PyObject *obj = view->obj;
PyBufferProcs *pb;
if (obj == NULL)
return;
pb = Py_TYPE(obj)->tp_as_buffer;
if (pb && pb->bf_releasebuffer) {
pb->bf_releasebuffer(obj, view);
}
view->obj = NULL;
Py_DECREF(obj);
}
static int
_buffer_release_call(void *arg)
{
PyBuffer_Release((Py_buffer *)arg);
return 0;
}
int
_PyBuffer_ReleaseInInterpreter(PyInterpreterState *interp,
Py_buffer *view)
{
return _Py_CallInInterpreter(interp, _buffer_release_call, view);
}
int
_PyBuffer_ReleaseInInterpreterAndRawFree(PyInterpreterState *interp,
Py_buffer *view)
{
return _Py_CallInInterpreterAndRawFree(interp, _buffer_release_call, view);
}
PyObject *
PyObject_Format(PyObject *obj, PyObject *format_spec)
{
PyObject *meth;
PyObject *empty = NULL;
PyObject *result = NULL;
if (format_spec != NULL && !PyUnicode_Check(format_spec)) {
PyErr_Format(PyExc_SystemError,
"Format specifier must be a string, not %.200s",
Py_TYPE(format_spec)->tp_name);
return NULL;
}
/* Fast path for common types. */
if (format_spec == NULL || PyUnicode_GET_LENGTH(format_spec) == 0) {
if (PyUnicode_CheckExact(obj)) {
return Py_NewRef(obj);
}
if (PyLong_CheckExact(obj)) {
return PyObject_Str(obj);
}
}
/* If no format_spec is provided, use an empty string */
if (format_spec == NULL) {
empty = PyUnicode_New(0, 0);
format_spec = empty;
}
/* Find the (unbound!) __format__ method */
meth = _PyObject_LookupSpecial(obj, &_Py_ID(__format__));
if (meth == NULL) {
PyThreadState *tstate = _PyThreadState_GET();
if (!_PyErr_Occurred(tstate)) {
_PyErr_Format(tstate, PyExc_TypeError,
"Type %.100s doesn't define __format__",
Py_TYPE(obj)->tp_name);
}
goto done;
}
/* And call it. */
result = PyObject_CallOneArg(meth, format_spec);
Py_DECREF(meth);
if (result && !PyUnicode_Check(result)) {
PyErr_Format(PyExc_TypeError,
"__format__ must return a str, not %.200s",
Py_TYPE(result)->tp_name);
Py_SETREF(result, NULL);
goto done;
}
done:
Py_XDECREF(empty);
return result;
}
/* Operations on numbers */
int
PyNumber_Check(PyObject *o)
{
if (o == NULL)
return 0;
PyNumberMethods *nb = Py_TYPE(o)->tp_as_number;
return nb && (nb->nb_index || nb->nb_int || nb->nb_float || PyComplex_Check(o));
}
/* Binary operators */
#define NB_SLOT(x) offsetof(PyNumberMethods, x)
#define NB_BINOP(nb_methods, slot) \
(*(binaryfunc*)(& ((char*)nb_methods)[slot]))
#define NB_TERNOP(nb_methods, slot) \
(*(ternaryfunc*)(& ((char*)nb_methods)[slot]))
/*
Calling scheme used for binary operations:
Order operations are tried until either a valid result or error:
w.op(v,w)[*], v.op(v,w), w.op(v,w)
[*] only when Py_TYPE(v) != Py_TYPE(w) && Py_TYPE(w) is a subclass of
Py_TYPE(v)
*/
static PyObject *
binary_op1(PyObject *v, PyObject *w, const int op_slot
#ifndef NDEBUG
, const char *op_name
#endif
)
{
binaryfunc slotv;
if (Py_TYPE(v)->tp_as_number != NULL) {
slotv = NB_BINOP(Py_TYPE(v)->tp_as_number, op_slot);
}
else {
slotv = NULL;
}
binaryfunc slotw;
if (!Py_IS_TYPE(w, Py_TYPE(v)) && Py_TYPE(w)->tp_as_number != NULL) {
slotw = NB_BINOP(Py_TYPE(w)->tp_as_number, op_slot);
if (slotw == slotv) {
slotw = NULL;
}
}
else {
slotw = NULL;
}
if (slotv) {
PyObject *x;
if (slotw && PyType_IsSubtype(Py_TYPE(w), Py_TYPE(v))) {
x = slotw(v, w);
if (x != Py_NotImplemented)
return x;
Py_DECREF(x); /* can't do it */
slotw = NULL;
}
x = slotv(v, w);
assert(_Py_CheckSlotResult(v, op_name, x != NULL));
if (x != Py_NotImplemented) {
return x;
}
Py_DECREF(x); /* can't do it */
}
if (slotw) {
PyObject *x = slotw(v, w);
assert(_Py_CheckSlotResult(w, op_name, x != NULL));
if (x != Py_NotImplemented) {
return x;
}
Py_DECREF(x); /* can't do it */
}
Py_RETURN_NOTIMPLEMENTED;
}
#ifdef NDEBUG
# define BINARY_OP1(v, w, op_slot, op_name) binary_op1(v, w, op_slot)
#else
# define BINARY_OP1(v, w, op_slot, op_name) binary_op1(v, w, op_slot, op_name)
#endif
static PyObject *
binop_type_error(PyObject *v, PyObject *w, const char *op_name)
{
PyErr_Format(PyExc_TypeError,
"unsupported operand type(s) for %.100s: "
"'%.100s' and '%.100s'",
op_name,
Py_TYPE(v)->tp_name,
Py_TYPE(w)->tp_name);
return NULL;
}
static PyObject *
binary_op(PyObject *v, PyObject *w, const int op_slot, const char *op_name)
{
PyObject *result = BINARY_OP1(v, w, op_slot, op_name);
if (result == Py_NotImplemented) {
Py_DECREF(result);
if (op_slot == NB_SLOT(nb_rshift) &&
PyCFunction_CheckExact(v) &&
strcmp(((PyCFunctionObject *)v)->m_ml->ml_name, "print") == 0)
{