1#ifndef Py_CPYTHON_MEMORYOBJECT_H
2# error "this header file must not be included directly"
3#endif
4
5PyAPI_DATA(PyTypeObject) _PyManagedBuffer_Type;
6
7/* The structs are declared here so that macros can work, but they shouldn't
8 be considered public. Don't access their fields directly, use the macros
9 and functions instead! */
10#define _Py_MANAGED_BUFFER_RELEASED 0x001 /* access to exporter blocked */
11#define _Py_MANAGED_BUFFER_FREE_FORMAT 0x002 /* free format */
12
13typedef struct {
14 PyObject_HEAD
15 int flags; /* state flags */
16 Py_ssize_t exports; /* number of direct memoryview exports */
17 Py_buffer master; /* snapshot buffer obtained from the original exporter */
18} _PyManagedBufferObject;
19
20
21/* memoryview state flags */
22#define _Py_MEMORYVIEW_RELEASED 0x001 /* access to master buffer blocked */
23#define _Py_MEMORYVIEW_C 0x002 /* C-contiguous layout */
24#define _Py_MEMORYVIEW_FORTRAN 0x004 /* Fortran contiguous layout */
25#define _Py_MEMORYVIEW_SCALAR 0x008 /* scalar: ndim = 0 */
26#define _Py_MEMORYVIEW_PIL 0x010 /* PIL-style layout */
27#define _Py_MEMORYVIEW_RESTRICTED 0x020 /* Disallow new references to the memoryview's buffer */
28
29typedef struct {
30 PyObject_VAR_HEAD
31 _PyManagedBufferObject *mbuf; /* managed buffer */
32 Py_hash_t hash; /* hash value for read-only views */
33 int flags; /* state flags */
34 Py_ssize_t exports; /* number of buffer re-exports */
35 Py_buffer view; /* private copy of the exporter's view */
36 PyObject *weakreflist;
37 Py_ssize_t ob_array[1]; /* shape, strides, suboffsets */
38} PyMemoryViewObject;
39
40#define _PyMemoryView_CAST(op) _Py_CAST(PyMemoryViewObject*, op)
41
42/* Get a pointer to the memoryview's private copy of the exporter's buffer. */
43static inline Py_buffer* PyMemoryView_GET_BUFFER(PyObject *op) {
44 return (&_PyMemoryView_CAST(op)->view);
45}
46#define PyMemoryView_GET_BUFFER(op) PyMemoryView_GET_BUFFER(_PyObject_CAST(op))
47
48/* Get a pointer to the exporting object (this may be NULL!). */
49static inline PyObject* PyMemoryView_GET_BASE(PyObject *op) {
50 return _PyMemoryView_CAST(op)->view.obj;
51}
52#define PyMemoryView_GET_BASE(op) PyMemoryView_GET_BASE(_PyObject_CAST(op))
53

source code of include/python3.12/cpython/memoryobject.h