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bpo-45459: Add Py_buffer to limited API (GH-29991)

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- [x] ``Py_buffer`` struct
- [x] ``PyBuffer_*()`` API functions
- [x] ``PyBUF_*`` constants
- [x] ``Py_bf_getbuffer`` and ``Py_bf_releasebuffer`` type slots
- [x] ``PyMemoryView_FromBuffer()`` API
- [x] tests for limited API
- [x] ``make regen-limited-abi``
- [x] documentation update
- [ ] export ``PyPickleBuffer*()`` API ???
This commit is contained in:
Christian Heimes 2022-02-02 17:03:10 +02:00 committed by GitHub
parent 08f8301b21
commit f66c857572
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GPG key ID: 4AEE18F83AFDEB23
17 changed files with 308 additions and 131 deletions
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7
Doc/c-api/buffer.rst
View file

@ -499,6 +499,13 @@ Buffer-related functions
This function fails if *len* != *src->len*.
.. c:function:: int PyObject_CopyData(Py_buffer *dest, Py_buffer *src)
Copy data from *src* to *dest* buffer. Can convert between C-style and
or Fortran-style buffers.
``0`` is returned on success, ``-1`` on error.
.. c:function:: void PyBuffer_FillContiguousStrides(int ndims, Py_ssize_t *shape, Py_ssize_t *strides, int itemsize, char order)
Fill the *strides* array with byte-strides of a :term:`contiguous` (C-style if

11
Doc/c-api/type.rst
View file

@ -272,12 +272,6 @@ The following functions and structs are used to create
* :c:member:`~PyTypeObject.tp_vectorcall_offset`
(see :ref:`PyMemberDef <pymemberdef-offsets>`)
The following fields cannot be set using :c:type:`PyType_Spec` and
:c:type:`PyType_Slot` under the limited API:
* :c:member:`~PyBufferProcs.bf_getbuffer`
* :c:member:`~PyBufferProcs.bf_releasebuffer`
Setting :c:data:`Py_tp_bases` or :c:data:`Py_tp_base` may be
problematic on some platforms.
To avoid issues, use the *bases* argument of
@ -287,6 +281,11 @@ The following functions and structs are used to create
Slots in :c:type:`PyBufferProcs` in may be set in the unlimited API.
.. versionchanged:: 3.11
:c:member:`~PyBufferProcs.bf_getbuffer` and
:c:member:`~PyBufferProcs.bf_releasebuffer` are now available
under limited API.
.. c:member:: void *PyType_Slot.pfunc
The desired value of the slot. In most cases, this is a pointer

13
Doc/data/stable_abi.dat
View file

@ -10,6 +10,14 @@ function,PyArg_ValidateKeywordArguments,3.2,
var,PyBaseObject_Type,3.2,
function,PyBool_FromLong,3.2,
var,PyBool_Type,3.2,
function,PyBuffer_FillContiguousStrides,3.11,
function,PyBuffer_FillInfo,3.11,
function,PyBuffer_FromContiguous,3.11,
function,PyBuffer_GetPointer,3.11,
function,PyBuffer_IsContiguous,3.11,
function,PyBuffer_Release,3.11,
function,PyBuffer_SizeFromFormat,3.11,
function,PyBuffer_ToContiguous,3.11,
var,PyByteArrayIter_Type,3.2,
function,PyByteArray_AsString,3.2,
function,PyByteArray_Concat,3.2,
@ -375,6 +383,7 @@ function,PyMem_Malloc,3.2,
function,PyMem_Realloc,3.2,
type,PyMemberDef,3.2,
var,PyMemberDescr_Type,3.2,
function,PyMemoryView_FromBuffer,3.11,
function,PyMemoryView_FromMemory,3.7,
function,PyMemoryView_FromObject,3.2,
function,PyMemoryView_GetContiguous,3.2,
@ -476,8 +485,10 @@ function,PyObject_CallMethodObjArgs,3.2,
function,PyObject_CallNoArgs,3.10,
function,PyObject_CallObject,3.2,
function,PyObject_Calloc,3.7,
function,PyObject_CheckBuffer,3.11,
function,PyObject_CheckReadBuffer,3.2,
function,PyObject_ClearWeakRefs,3.2,
function,PyObject_CopyData,3.11,
function,PyObject_DelItem,3.2,
function,PyObject_DelItemString,3.2,
function,PyObject_Dir,3.2,
@ -495,6 +506,7 @@ function,PyObject_GenericSetDict,3.7,
function,PyObject_GetAIter,3.10,
function,PyObject_GetAttr,3.2,
function,PyObject_GetAttrString,3.2,
function,PyObject_GetBuffer,3.11,
function,PyObject_GetItem,3.2,
function,PyObject_GetIter,3.2,
function,PyObject_HasAttr,3.2,
@ -832,6 +844,7 @@ var,Py_UTF8Mode,3.8,
function,Py_VaBuildValue,3.2,
var,Py_Version,3.11,
function,Py_XNewRef,3.10,
type,Py_buffer,3.11,
type,Py_intptr_t,3.2,
type,Py_ssize_t,3.2,
type,Py_uintptr_t,3.2,

20
Doc/whatsnew/3.11.rst
View file

@ -657,6 +657,26 @@ New Features
:c:macro:`PY_VERSION_HEX`.
(Contributed by Gabriele N. Tornetta in :issue:`43931`.)
* :c:type:`Py_buffer` and APIs are now part of the limited API and the stable
ABI:
* :c:func:`PyObject_CheckBuffer`
* :c:func:`PyObject_GetBuffer`
* :c:func:`PyBuffer_GetPointer`
* :c:func:`PyBuffer_SizeFromFormat`
* :c:func:`PyBuffer_ToContiguous`
* :c:func:`PyBuffer_FromContiguous`
* :c:func:`PyBuffer_CopyData`
* :c:func:`PyBuffer_IsContiguous`
* :c:func:`PyBuffer_FillContiguousStrides`
* :c:func:`PyBuffer_FillInfo`
* :c:func:`PyBuffer_Release`
* :c:func:`PyMemoryView_FromBuffer`
* :c:member:`~PyBufferProcs.bf_getbuffer` and
:c:member:`~PyBufferProcs.bf_releasebuffer` type slots
(Contributed by Christian Heimes in :issue:`45459`.)
Porting to Python 3.11
----------------------

1
Include/Python.h
View file

@ -50,6 +50,7 @@
#include "longobject.h"
#include "cpython/longintrepr.h"
#include "boolobject.h"
#include "buffer.h"
#include "floatobject.h"
#include "complexobject.h"
#include "rangeobject.h"

142
Include/buffer.h Normal file
View file

@ -0,0 +1,142 @@
/* Public Py_buffer API */
#ifndef Py_BUFFER_H
#define Py_BUFFER_H
#ifdef __cplusplus
extern "C" {
#endif
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030b0000
/* === New Buffer API ============================================
* Limited API and stable ABI since Python 3.11
*
* Py_buffer struct layout and size is now part of the stable abi3. The
* struct layout and size must not be changed in any way, as it would
* break the ABI.
*
*/
typedef struct {
void *buf;
PyObject *obj; /* owned reference */
Py_ssize_t len;
Py_ssize_t itemsize; /* This is Py_ssize_t so it can be
pointed to by strides in simple case.*/
int readonly;
int ndim;
char *format;
Py_ssize_t *shape;
Py_ssize_t *strides;
Py_ssize_t *suboffsets;
void *internal;
} Py_buffer;
/* Return 1 if the getbuffer function is available, otherwise return 0. */
PyAPI_FUNC(int) PyObject_CheckBuffer(PyObject *obj);
/* This is a C-API version of the getbuffer function call. It checks
to make sure object has the required function pointer and issues the
call.
Returns -1 and raises an error on failure and returns 0 on success. */
PyAPI_FUNC(int) PyObject_GetBuffer(PyObject *obj, Py_buffer *view,
int flags);
/* Get the memory area pointed to by the indices for the buffer given.
Note that view->ndim is the assumed size of indices. */
PyAPI_FUNC(void *) PyBuffer_GetPointer(const Py_buffer *view, const Py_ssize_t *indices);
/* Return the implied itemsize of the data-format area from a
struct-style description. */
PyAPI_FUNC(Py_ssize_t) PyBuffer_SizeFromFormat(const char *format);
/* Implementation in memoryobject.c */
PyAPI_FUNC(int) PyBuffer_ToContiguous(void *buf, const Py_buffer *view,
Py_ssize_t len, char order);
PyAPI_FUNC(int) PyBuffer_FromContiguous(const Py_buffer *view, const void *buf,
Py_ssize_t len, char order);
/* Copy len bytes of data from the contiguous chunk of memory
pointed to by buf into the buffer exported by obj. Return
0 on success and return -1 and raise a PyBuffer_Error on
error (i.e. the object does not have a buffer interface or
it is not working).
If fort is 'F', then if the object is multi-dimensional,
then the data will be copied into the array in
Fortran-style (first dimension varies the fastest). If
fort is 'C', then the data will be copied into the array
in C-style (last dimension varies the fastest). If fort
is 'A', then it does not matter and the copy will be made
in whatever way is more efficient. */
PyAPI_FUNC(int) PyObject_CopyData(PyObject *dest, PyObject *src);
/* Copy the data from the src buffer to the buffer of destination. */
PyAPI_FUNC(int) PyBuffer_IsContiguous(const Py_buffer *view, char fort);
/*Fill the strides array with byte-strides of a contiguous
(Fortran-style if fort is 'F' or C-style otherwise)
array of the given shape with the given number of bytes
per element. */
PyAPI_FUNC(void) PyBuffer_FillContiguousStrides(int ndims,
Py_ssize_t *shape,
Py_ssize_t *strides,
int itemsize,
char fort);
/* Fills in a buffer-info structure correctly for an exporter
that can only share a contiguous chunk of memory of
"unsigned bytes" of the given length.
Returns 0 on success and -1 (with raising an error) on error. */
PyAPI_FUNC(int) PyBuffer_FillInfo(Py_buffer *view, PyObject *o, void *buf,
Py_ssize_t len, int readonly,
int flags);
/* Releases a Py_buffer obtained from getbuffer ParseTuple's "s*". */
PyAPI_FUNC(void) PyBuffer_Release(Py_buffer *view);
/* Maximum number of dimensions */
#define PyBUF_MAX_NDIM 64
/* Flags for getting buffers */
#define PyBUF_SIMPLE 0
#define PyBUF_WRITABLE 0x0001
#ifndef Py_LIMITED_API
/* we used to include an E, backwards compatible alias */
#define PyBUF_WRITEABLE PyBUF_WRITABLE
#endif
#define PyBUF_FORMAT 0x0004
#define PyBUF_ND 0x0008
#define PyBUF_STRIDES (0x0010 | PyBUF_ND)
#define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)
#define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)
#define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)
#define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)
#define PyBUF_CONTIG (PyBUF_ND | PyBUF_WRITABLE)
#define PyBUF_CONTIG_RO (PyBUF_ND)
#define PyBUF_STRIDED (PyBUF_STRIDES | PyBUF_WRITABLE)
#define PyBUF_STRIDED_RO (PyBUF_STRIDES)
#define PyBUF_RECORDS (PyBUF_STRIDES | PyBUF_WRITABLE | PyBUF_FORMAT)
#define PyBUF_RECORDS_RO (PyBUF_STRIDES | PyBUF_FORMAT)
#define PyBUF_FULL (PyBUF_INDIRECT | PyBUF_WRITABLE | PyBUF_FORMAT)
#define PyBUF_FULL_RO (PyBUF_INDIRECT | PyBUF_FORMAT)
#define PyBUF_READ 0x100
#define PyBUF_WRITE 0x200
#endif /* !Py_LIMITED_API || Py_LIMITED_API >= 3.11 */
#ifdef __cplusplus
}
#endif
#endif /* Py_BUFFER_H */

68
Include/cpython/abstract.h
View file

@ -168,74 +168,6 @@ PyAPI_FUNC(int) _PyObject_HasLen(PyObject *o);
value. If one of the calls fails, this function returns -1. */
PyAPI_FUNC(Py_ssize_t) PyObject_LengthHint(PyObject *o, Py_ssize_t);
/* === New Buffer API ============================================ */
/* Return 1 if the getbuffer function is available, otherwise return 0. */
PyAPI_FUNC(int) PyObject_CheckBuffer(PyObject *obj);
/* This is a C-API version of the getbuffer function call. It checks
to make sure object has the required function pointer and issues the
call.
Returns -1 and raises an error on failure and returns 0 on success. */
PyAPI_FUNC(int) PyObject_GetBuffer(PyObject *obj, Py_buffer *view,
int flags);
/* Get the memory area pointed to by the indices for the buffer given.
Note that view->ndim is the assumed size of indices. */
PyAPI_FUNC(void *) PyBuffer_GetPointer(const Py_buffer *view, const Py_ssize_t *indices);
/* Return the implied itemsize of the data-format area from a
struct-style description. */
PyAPI_FUNC(Py_ssize_t) PyBuffer_SizeFromFormat(const char *format);
/* Implementation in memoryobject.c */
PyAPI_FUNC(int) PyBuffer_ToContiguous(void *buf, const Py_buffer *view,
Py_ssize_t len, char order);
PyAPI_FUNC(int) PyBuffer_FromContiguous(const Py_buffer *view, const void *buf,
Py_ssize_t len, char order);
/* Copy len bytes of data from the contiguous chunk of memory
pointed to by buf into the buffer exported by obj. Return
0 on success and return -1 and raise a PyBuffer_Error on
error (i.e. the object does not have a buffer interface or
it is not working).
If fort is 'F', then if the object is multi-dimensional,
then the data will be copied into the array in
Fortran-style (first dimension varies the fastest). If
fort is 'C', then the data will be copied into the array
in C-style (last dimension varies the fastest). If fort
is 'A', then it does not matter and the copy will be made
in whatever way is more efficient. */
PyAPI_FUNC(int) PyObject_CopyData(PyObject *dest, PyObject *src);
/* Copy the data from the src buffer to the buffer of destination. */
PyAPI_FUNC(int) PyBuffer_IsContiguous(const Py_buffer *view, char fort);
/*Fill the strides array with byte-strides of a contiguous
(Fortran-style if fort is 'F' or C-style otherwise)
array of the given shape with the given number of bytes
per element. */
PyAPI_FUNC(void) PyBuffer_FillContiguousStrides(int ndims,
Py_ssize_t *shape,
Py_ssize_t *strides,
int itemsize,
char fort);
/* Fills in a buffer-info structure correctly for an exporter
that can only share a contiguous chunk of memory of
"unsigned bytes" of the given length.
Returns 0 on success and -1 (with raising an error) on error. */
PyAPI_FUNC(int) PyBuffer_FillInfo(Py_buffer *view, PyObject *o, void *buf,
Py_ssize_t len, int readonly,
int flags);
/* Releases a Py_buffer obtained from getbuffer ParseTuple's "s*". */
PyAPI_FUNC(void) PyBuffer_Release(Py_buffer *view);
/* === Sequence protocol ================================================ */
/* Assume tp_as_sequence and sq_item exist and that 'i' does not

51
Include/cpython/object.h
View file

@ -2,6 +2,8 @@
# error "this header file must not be included directly"
#endif
#include "buffer.h" // for Py_buffer, included after PyObject has been defined
PyAPI_FUNC(void) _Py_NewReference(PyObject *op);
#ifdef Py_TRACE_REFS
@ -45,61 +47,12 @@ typedef struct _Py_Identifier {
#define _Py_static_string(varname, value) static _Py_Identifier varname = _Py_static_string_init(value)
#define _Py_IDENTIFIER(varname) _Py_static_string(PyId_##varname, #varname)
/* buffer interface */
typedef struct bufferinfo {
void *buf;
PyObject *obj; /* owned reference */
Py_ssize_t len;
Py_ssize_t itemsize; /* This is Py_ssize_t so it can be
pointed to by strides in simple case.*/
int readonly;
int ndim;
char *format;
Py_ssize_t *shape;
Py_ssize_t *strides;
Py_ssize_t *suboffsets;
void *internal;
} Py_buffer;
typedef int (*getbufferproc)(PyObject *, Py_buffer *, int);
typedef void (*releasebufferproc)(PyObject *, Py_buffer *);
typedef PyObject *(*vectorcallfunc)(PyObject *callable, PyObject *const *args,
size_t nargsf, PyObject *kwnames);
/* Maximum number of dimensions */
#define PyBUF_MAX_NDIM 64
/* Flags for getting buffers */
#define PyBUF_SIMPLE 0
#define PyBUF_WRITABLE 0x0001
/* we used to include an E, backwards compatible alias */
#define PyBUF_WRITEABLE PyBUF_WRITABLE
#define PyBUF_FORMAT 0x0004
#define PyBUF_ND 0x0008
#define PyBUF_STRIDES (0x0010 | PyBUF_ND)
#define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)
#define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)
#define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)
#define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)
#define PyBUF_CONTIG (PyBUF_ND | PyBUF_WRITABLE)
#define PyBUF_CONTIG_RO (PyBUF_ND)
#define PyBUF_STRIDED (PyBUF_STRIDES | PyBUF_WRITABLE)
#define PyBUF_STRIDED_RO (PyBUF_STRIDES)
#define PyBUF_RECORDS (PyBUF_STRIDES | PyBUF_WRITABLE | PyBUF_FORMAT)
#define PyBUF_RECORDS_RO (PyBUF_STRIDES | PyBUF_FORMAT)
#define PyBUF_FULL (PyBUF_INDIRECT | PyBUF_WRITABLE | PyBUF_FORMAT)
#define PyBUF_FULL_RO (PyBUF_INDIRECT | PyBUF_FORMAT)
#define PyBUF_READ 0x100
#define PyBUF_WRITE 0x200
/* End buffer interface */
typedef struct {
/* Number implementations must check *both*

2
Include/memoryobject.h
View file

@ -25,7 +25,7 @@ PyAPI_FUNC(PyObject *) PyMemoryView_FromObject(PyObject *base);
PyAPI_FUNC(PyObject *) PyMemoryView_FromMemory(char *mem, Py_ssize_t size,
int flags);
#endif
#ifndef Py_LIMITED_API
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030b0000
PyAPI_FUNC(PyObject *) PyMemoryView_FromBuffer(const Py_buffer *info);
#endif
PyAPI_FUNC(PyObject *) PyMemoryView_GetContiguous(PyObject *base,

6
Include/typeslots.h
View file

@ -1,12 +1,6 @@
/* Do not renumber the file; these numbers are part of the stable ABI. */
#if defined(Py_LIMITED_API)
/* Disabled, see #10181 */
#undef Py_bf_getbuffer
#undef Py_bf_releasebuffer
#else
#define Py_bf_getbuffer 1
#define Py_bf_releasebuffer 2
#endif
#define Py_mp_ass_subscript 3
#define Py_mp_length 4
#define Py_mp_subscript 5

12
Lib/test/test_stable_abi_ctypes.py
View file

@ -28,6 +28,14 @@ SYMBOL_NAMES = (
"PyBaseObject_Type",
"PyBool_FromLong",
"PyBool_Type",
"PyBuffer_FillContiguousStrides",
"PyBuffer_FillInfo",
"PyBuffer_FromContiguous",
"PyBuffer_GetPointer",
"PyBuffer_IsContiguous",
"PyBuffer_Release",
"PyBuffer_SizeFromFormat",
"PyBuffer_ToContiguous",
"PyByteArrayIter_Type",
"PyByteArray_AsString",
"PyByteArray_Concat",
@ -381,6 +389,7 @@ SYMBOL_NAMES = (
"PyMemberDescr_Type",
"PyMember_GetOne",
"PyMember_SetOne",
"PyMemoryView_FromBuffer",
"PyMemoryView_FromMemory",
"PyMemoryView_FromObject",
"PyMemoryView_GetContiguous",
@ -470,8 +479,10 @@ SYMBOL_NAMES = (
"PyObject_CallNoArgs",
"PyObject_CallObject",
"PyObject_Calloc",
"PyObject_CheckBuffer",
"PyObject_CheckReadBuffer",
"PyObject_ClearWeakRefs",
"PyObject_CopyData",
"PyObject_DelItem",
"PyObject_DelItemString",
"PyObject_Dir",
@ -489,6 +500,7 @@ SYMBOL_NAMES = (
"PyObject_GetAIter",
"PyObject_GetAttr",
"PyObject_GetAttrString",
"PyObject_GetBuffer",
"PyObject_GetItem",
"PyObject_GetIter",
"PyObject_HasAttr",

11
Lib/test/test_xxlimited.py
View file

@ -58,6 +58,17 @@ def test_error(self):
with self.assertRaises(self.module.Error):
raise self.module.Error
def test_buffer(self):
xxo = self.module.Xxo()
self.assertEqual(xxo.x_exports, 0)
b1 = memoryview(xxo)
self.assertEqual(xxo.x_exports, 1)
b2 = memoryview(xxo)
self.assertEqual(xxo.x_exports, 2)
b1[0] = 1
self.assertEqual(b1[0], 1)
self.assertEqual(b2[0], 1)
class TestXXLimited35(CommonTests, unittest.TestCase):
module = xxlimited_35

1
Makefile.pre.in
View file

@ -1439,6 +1439,7 @@ PYTHON_HEADERS= \
$(srcdir)/Include/abstract.h \
$(srcdir)/Include/bltinmodule.h \
$(srcdir)/Include/boolobject.h \
$(srcdir)/Include/buffer.h \
$(srcdir)/Include/bytearrayobject.h \
$(srcdir)/Include/bytesobject.h \
$(srcdir)/Include/ceval.h \

2
Misc/NEWS.d/next/C API/2021-10-18-16-54-24.bpo-45459.Y1pEZs.rst Normal file
View file

@ -0,0 +1,2 @@
:c:type:`Py_buffer` and various ``Py_buffer`` related functions are now
part of the limited API and stable ABI.

28
Misc/stable_abi.txt
View file

@ -2191,6 +2191,34 @@ function PyType_GetQualName
data PyStructSequence_UnnamedField
added 3.11
# Add stable Py_buffer API in Python 3.11 (https://bugs.python.org/issue45459)
struct Py_buffer
added 3.11
function PyObject_CheckBuffer
added 3.11
function PyObject_GetBuffer
added 3.11
function PyBuffer_GetPointer
added 3.11
function PyBuffer_SizeFromFormat
added 3.11
function PyBuffer_ToContiguous
added 3.11
function PyBuffer_FromContiguous
added 3.11
function PyObject_CopyData
added 3.11
function PyBuffer_IsContiguous
added 3.11
function PyBuffer_FillContiguousStrides
added 3.11
function PyBuffer_FillInfo
added 3.11
function PyBuffer_Release
added 3.11
function PyMemoryView_FromBuffer
added 3.11
# (Detailed comments aren't really needed for further entries: from here on
# we can use version control logs.)

52
Modules/xxlimited.c
View file

@ -19,6 +19,7 @@
def __init__(self):
# In the C class, "_x_attr" is not accessible from Python code
self._x_attr = {}
self._x_exports = 0
def __getattr__(self, name):
return self._x_attr[name]
@ -29,6 +30,13 @@
def __delattr__(self, name):
del self._x_attr[name]
@property
def x_exports(self):
"""Return the number of times an internal buffer is exported."""
# Each Xxo instance has a 10-byte buffer that can be
# accessed via the buffer interface (e.g. `memoryview`).
return self._x_exports
def demo(o, /):
if isinstance(o, str):
return o
@ -57,6 +65,9 @@
#define Py_LIMITED_API 0x030b0000
#include "Python.h"
#include <string.h>
#define BUFSIZE 10
// Module state
typedef struct {
@ -70,7 +81,9 @@ typedef struct {
// Instance state
typedef struct {
PyObject_HEAD
PyObject *x_attr; /* Attributes dictionary */
PyObject *x_attr; /* Attributes dictionary */
char x_buffer[BUFSIZE]; /* buffer for Py_buffer */
Py_ssize_t x_exports; /* how many buffer are exported */
} XxoObject;
// XXX: no good way to do this yet
@ -89,6 +102,8 @@ newXxoObject(PyObject *module)
return NULL;
}
self->x_attr = NULL;
memset(self->x_buffer, 0, BUFSIZE);
self->x_exports = 0;
return self;
}
@ -212,11 +227,43 @@ static PyMethodDef Xxo_methods[] = {
{NULL, NULL} /* sentinel */
};
/* Xxo buffer interface */
static int
Xxo_getbuffer(XxoObject *self, Py_buffer *view, int flags)
{
int res = PyBuffer_FillInfo(view, (PyObject*)self,
(void *)self->x_buffer, BUFSIZE,
0, flags);
if (res == 0) {
self->x_exports++;
}
return res;
}
static void
Xxo_releasebuffer(XxoObject *self, Py_buffer *view)
{
self->x_exports--;
}
static PyObject *
Xxo_get_x_exports(XxoObject *self, void *c)
{
return PyLong_FromSsize_t(self->x_exports);
}
/* Xxo type definition */
PyDoc_STRVAR(Xxo_doc,
"A class that explicitly stores attributes in an internal dict");
static PyGetSetDef Xxo_getsetlist[] = {
{"x_exports", (getter) Xxo_get_x_exports, NULL, NULL},
{NULL},
};
static PyType_Slot Xxo_Type_slots[] = {
{Py_tp_doc, (char *)Xxo_doc},
{Py_tp_traverse, Xxo_traverse},
@ -226,6 +273,9 @@ static PyType_Slot Xxo_Type_slots[] = {
{Py_tp_getattro, Xxo_getattro},
{Py_tp_setattro, Xxo_setattro},
{Py_tp_methods, Xxo_methods},
{Py_bf_getbuffer, Xxo_getbuffer},
{Py_bf_releasebuffer, Xxo_releasebuffer},
{Py_tp_getset, Xxo_getsetlist},
{0, 0}, /* sentinel */
};

12
PC/python3dll.c
View file

@ -94,6 +94,14 @@ EXPORT_FUNC(PyArg_ValidateKeywordArguments)
EXPORT_FUNC(PyArg_VaParse)
EXPORT_FUNC(PyArg_VaParseTupleAndKeywords)
EXPORT_FUNC(PyBool_FromLong)
EXPORT_FUNC(PyBuffer_FillContiguousStrides)
EXPORT_FUNC(PyBuffer_FillInfo)
EXPORT_FUNC(PyBuffer_FromContiguous)
EXPORT_FUNC(PyBuffer_GetPointer)
EXPORT_FUNC(PyBuffer_IsContiguous)
EXPORT_FUNC(PyBuffer_Release)
EXPORT_FUNC(PyBuffer_SizeFromFormat)
EXPORT_FUNC(PyBuffer_ToContiguous)
EXPORT_FUNC(PyByteArray_AsString)
EXPORT_FUNC(PyByteArray_Concat)
EXPORT_FUNC(PyByteArray_FromObject)
@ -352,6 +360,7 @@ EXPORT_FUNC(PyMem_Malloc)
EXPORT_FUNC(PyMem_Realloc)
EXPORT_FUNC(PyMember_GetOne)
EXPORT_FUNC(PyMember_SetOne)
EXPORT_FUNC(PyMemoryView_FromBuffer)
EXPORT_FUNC(PyMemoryView_FromMemory)
EXPORT_FUNC(PyMemoryView_FromObject)
EXPORT_FUNC(PyMemoryView_GetContiguous)
@ -426,8 +435,10 @@ EXPORT_FUNC(PyObject_CallMethodObjArgs)
EXPORT_FUNC(PyObject_CallNoArgs)
EXPORT_FUNC(PyObject_CallObject)
EXPORT_FUNC(PyObject_Calloc)
EXPORT_FUNC(PyObject_CheckBuffer)
EXPORT_FUNC(PyObject_CheckReadBuffer)
EXPORT_FUNC(PyObject_ClearWeakRefs)
EXPORT_FUNC(PyObject_CopyData)
EXPORT_FUNC(PyObject_DelItem)
EXPORT_FUNC(PyObject_DelItemString)
EXPORT_FUNC(PyObject_Dir)
@ -445,6 +456,7 @@ EXPORT_FUNC(PyObject_GenericSetDict)
EXPORT_FUNC(PyObject_GetAIter)
EXPORT_FUNC(PyObject_GetAttr)
EXPORT_FUNC(PyObject_GetAttrString)
EXPORT_FUNC(PyObject_GetBuffer)
EXPORT_FUNC(PyObject_GetItem)
EXPORT_FUNC(PyObject_GetIter)
EXPORT_FUNC(PyObject_HasAttr)