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